Interventional device release control mechanism, release method, and interventional device delivery system

Abstract

Interventional device release control mechanism, release method, and interventional device delivery system. The interventional device release control mechanism includes a first pipe fitting (11), an intermediate pipe fitting (13), and a second pipe fitting (12) that are slidably nested and cooperated with each other from the inside out. The distal end of the first pipe fitting (11) extends out of the intermediate pipe fitting (13), and a mounting head (112) for connecting an interventional device is provided at the extended portion. A flexible control member is connected to the intermediate pipe fitting (13). The control member has: a holding state, in which the control member penetrates through the mounting head (112) and binds the interventional device to the mounting head (112); an open state, allowing the interventional device to completely disengage from the mounting head (112); and a locking member (162) that is installed on the intermediate pipe fitting (13) and cooperates with the control member. The locking member (162) is slidably fitted relative to the intermediate pipe fitting (13) and switches different states of the control member during sliding. For the interventional device delivery system, the release method of the interventional device is improved, making it more convenient to operate.

Description

Technical Field

[0001] The present application relates to the field of medical devices, and in particular to an interventional device release control mechanism, a release method, and an interventional device delivery system. Background Art

[0002] The interventional device delivery system generally includes a control handle configured at the proximal end, i.e., the operator's side, and several slender tubes that slide and nest inside and outside. The proximal end of each tube is the control end and is connected to the control handle, and the distal end of each tube is the working end and can be inserted into the body and complete the delivery, release or recovery of the interventional device through mutual cooperation. The control handle can generally be provided with a sliding or rotating component, which then drives the relative movement of the tubes along the axial direction. Most of the existing control handles are controlled mechanically. With the development of interventional devices, more requirements are put forward for the functions of interventional devices.

[0003] Some existing technologies have improved the release and recovery of interventional devices, and introduced more active control through wire control. However, there is still a need for improvement in the control method, degree and related directionality of actions. Summary of the invention

[0004] The present application aims at the existing interventional instrument delivery system, and further improves the release method of the interventional instrument to make it easier to operate.

[0005] The present application provides an interventional instrument release control mechanism, comprising a first tube, an intermediate tube, and a second tube that are slidably nested from the inside to the outside in sequence, wherein the distal end of the first tube extends out of the intermediate tube, and a mounting head for connecting the interventional instrument is provided on the extended portion, and a flexible control member is connected to the intermediate tube, and the control member has:

[0006] a holding state, in which the control member penetrates the mounting head and restrains the interventional instrument to the mounting head;

[0007] The open state allows the interventional device to be completely detached from the mounting head;

[0008] The intermediate pipe is provided with a locking member matched with the control member. The locking member is slidably matched with the intermediate pipe and switches different states of the control member when sliding.

[0009] Several optional methods are also provided below, but they are not intended to be additional limitations on the above-mentioned overall solution, but are merely further supplements or preferences. Under the premise that there are no technical or logical contradictions, each optional method can be combined with the above-mentioned overall solution separately, and multiple optional methods can also be combined.

[0010] Optionally, the control member is a lashing wire. The proximal end of the interventional device is provided with a plurality of connecting ears. In the holding state, the lashing wire directly passes through and pulls each connecting ear; or an annular wire sleeve is arranged between the connecting ears. In the holding state, the lashing wire bypasses the annular wire sleeve and indirectly pulls the connecting ear through the annular wire sleeve.

[0011] Optionally, there are multiple lashing wires, and the pulling positions of the lashing wires and the annular wire sleeve are evenly distributed along the circumferential direction of the interventional device.

[0012] Optionally, when the intermediate pipe fitting moves relative to the first pipe fitting, the locking member is triggered by the mounting head and releases the control member into the open state.

[0013] Optionally, when the intermediate pipe fitting moves relative to the first pipe fitting, the movement direction of the intermediate pipe fitting is from the proximal end to the distal end.

[0014] Optionally, the way the locking member is triggered by the mounting head is direct abutment or indirect force application through a transmission member.

[0015] Optionally, when the locking member is triggered by the mounting head, the movement direction of the locking member is from the distal end to the proximal end.

[0016] Optionally, the intermediate pipe fitting is on the proximal side of the mounting head, and the interventional device is on the distal side of the mounting head. The mounting head is provided with a constriction guiding hole through which the control member passes to connect the interventional device, and in the holding state, the proximal side of the interventional device is restricted to the constriction guiding hole.

[0017] Optionally, in the holding state, the control member passes through and returns through the mounting head, and at least one of the forward and return paths passes through the constriction guiding hole.

[0018] Optionally, both the forward and return paths pass through the constriction guiding hole.

[0019] Optionally, there is one or more control members. For the same control member, the forward and return paths pass through the same constriction guiding hole.

[0020] Optionally, the mounting head is cylindrical and has an axial through hole, and the first pipe fitting passes through the axial through hole.

[0021] Optionally, the mounting head and the first pipe fitting are fixed to each other by at least one of welding, bonding, interference fit, and auxiliary connecting members.

[0022] Optionally, there are multiple constriction guiding holes. The proximal side of the interventional device is provided with connecting ears for passing through the control member. The connecting ears are divided into multiple groups. Before the interventional device is released, the connecting ears in the same group gather together to a corresponding constriction guiding hole.

[0023] Optionally, a plurality of converging guide holes are uniformly distributed along the circumferential direction of the mounting head.

[0024] Optionally, the number of the converging guide holes is 2 to 4.

[0025] Optionally, the converging guide holes extend along the axial direction of the first pipe fitting and penetrate through the mounting head.

[0026] Optionally, the opening part of the converging guide hole at the distal end side is provided with a guiding flared opening.

[0027] Optionally, a fixedly arranged base and a slidably arranged movable seat are mounted on the intermediate pipe fitting. A locking member and an unlocking rod are fixed on the movable seat. The unlocking rod penetrates through the base and the end of the unlocking rod protruding out of the base serves as a trigger end. A lock hole for receiving the locking member is formed on the base;

[0028] In the holding state, the control member is sleeved on the locking member, and the end of the locking member is inserted into the lock hole. When the intermediate pipe fitting moves distally relative to the first pipe fitting, the trigger end of the unlocking rod abuts against the mounting head and drives the locking member to move proximally out of the lock hole, so that the control member enters the open state.

[0029] Optionally, the movable seat includes:

[0030] An annular portion, slidably sleeved on the intermediate pipe fitting and located on the proximal side of the base;

[0031] The locking member, which is rod-shaped and extends distally from the annular portion

[0032] The unlocking rod, which extends distally from the annular portion and has an extension length greater than that of the locking member.

[0033] Optionally, one end of the lashing line is provided with a fixed wire loop, and the other end is provided with a movable wire loop;

[0034] In the holding state, the fixed wire loop is sleeved on the unlocking rod, and the movable wire loop is sleeved on the locking member;

[0035] In the open state, the fixed wire loop is sleeved on the unlocking rod, and the movable wire loop is disengaged from the locking member.

[0036] Optionally, the control member is a lashing line;

[0037] In the holding state, the lashing line directly or indirectly winds around the interventional device, and both ends of the lashing line are relatively fixed to the locking member;

[0038] In the open state, at least one end of the lashing line is separated from the locking member to release the restraint on the interventional device.

[0039] Optionally, in the holding state, there is a tight fit between the base and the movable seat. When the intermediate pipe fitting moves distally relative to the first pipe fitting, the movable seat follows the base until the trigger end of the unlocking rod abuts against the mounting head.

[0040] Optionally, a guiding hole for the unlocking rod to pass through is provided on the base. In the open state, at least a part of the unlocking rod is held within the guiding hole.

[0041] Optionally, the base is provided with an axial channel, and the distal part of the intermediate pipe fitting is inserted and fixed in the axial channel. The base includes:

[0042] A proximal disk, which is provided with avoidance holes for the locking member and the unlocking rod to pass through respectively;

[0043] A distal disk, which is provided with a locking hole for mating with the locking member and a guiding hole for the unlocking rod to pass through;

[0044] A transition section, which is fixedly connected between the proximal disk and the distal disk.

[0045] Optionally, a receiving groove is provided on one side of the proximal disk facing the annular part. The proximal ends of the locking member and the unlocking rod are connected by the annular part. In the holding state, the annular part is located within the receiving groove, and the avoidance holes are provided at the bottom of the receiving groove.

[0046] Optionally, the locking members and the unlocking rods are arranged alternately at intervals.

[0047] Optionally, there are two locking members and two unlocking rods respectively, and they are arranged alternately at uniform intervals.

[0048] Optionally, the outer periphery of the transition section is a fitting area that is radially retracted relative to the proximal disk and the distal disk. In the holding state, the connection parts of the binding wire with the locking members and the unlocking rods are all located within the fitting area.

[0049] Optionally, in the open state, the locking member withdraws from the locking hole until the distal part of the locking member is adjacent to the proximal disk.

[0050] Optionally, a wire passing groove for the binding wire to pass through is provided on the outer periphery of the distal disk.

[0051] Optionally, the wire passing groove is open to the outer periphery of the distal disk.

[0052] Optionally, a support sleeve is fixed on the intermediate pipe fitting, and the outer wall of the support sleeve is close to the inner wall of the second pipe fitting.

[0053] Optionally, the support sleeve is disposed at the proximal end of the base and spaced apart, and the sliding stroke of the movable seat is limited between the support sleeve and the base. The support sleeve has a first guiding surface on the side facing the proximal end, which gradually tapers from the distal end to the proximal end.

[0054] Optionally, the support sleeve has a second guiding surface on the side facing the distal end, which gradually tapers from the proximal end to the distal end. When the movable seat moves to the extreme position towards the proximal end, it abuts against the second guiding surface.

[0055] Certainly, when combined with the control handles of the aforementioned hydraulic drive, the present application also provides an interventional device delivery system, including a release control mechanism having the aforementioned structure, and a control handle for driving the release control mechanism. The proximal ends of the pipe fittings in the release control mechanism are connected to the control handle, and the relative movement of the pipe fittings is driven in a hydraulic manner at the control handle.

[0056] The present application also provides a method for releasing an interventional device, wherein the interventional device is loaded into the release control mechanism. The release control mechanism includes a first pipe fitting, an intermediate pipe fitting, and a second pipe fitting that are slidably nested and fitted with each other from the inside out. The distal end of the first pipe fitting extends out of the intermediate pipe fitting, and an installation head for connecting the interventional device is provided at the extended part. The intermediate pipe fitting is connected with a flexible control member and a locking member that cooperates with the control member. The proximal end of the interventional device is bound to the installation head by the control member in a compressed state, and the interventional device is wrapped by the second pipe fitting;

[0057] The release method includes:

[0058] Slide the second pipe fitting proximally relative to the first pipe fitting until the interventional device is completely exposed;

[0059] Slide the intermediate pipe fitting distally relative to the first pipe fitting, so that the control member follows distally and allows the proximal end of the interventional device to gradually move away from the installation head;

[0060] Drive the locking member to move to release the control member, so that the interventional device is completely released.

[0061] The release method of the present application can be combined with the release control mechanism and the interventional device delivery system of the present application.

[0062] Optionally, a fixed base and a slidable movable seat are installed on the intermediate pipe fitting. A locking member and an unlocking rod are fixed on the movable seat. The unlocking rod penetrates through the base from the proximal end to the distal end, and the end extending out of the base is used as a trigger end. A lock hole for receiving the locking member is provided on the base;

[0063] The control member is sleeved on the locking member in a holding state, and the end of the locking member is inserted into the lock hole;

[0064] A tight fit is provided between the base and the movable seat. When the intermediate pipe fitting is slid distally relative to the first pipe fitting, the movable seat follows the base, causing the control member to travel distally.

[0065] Optionally, the way to drive the locking member to move and release the control member is to slide the intermediate pipe fitting distally relative to the first pipe fitting until the triggering end of the unlocking lever abuts against the mounting head.

[0066] When the intermediate pipe fitting is further slid distally, the unlocking lever drives the movable seat away from the base under the blockage of the mounting head, and drives the locking member out of the locking hole, releasing the control member.

[0067] Optionally, a support sleeve is fixed on the intermediate pipe fitting. The outer wall of the support sleeve is close to the inner wall of the second pipe fitting. The support sleeve is located at the proximal end of the base and is arranged at intervals. When the intermediate pipe fitting is further slid distally, until the movable seat abuts against the support sleeve or until the base abuts against the mounting head.

[0068] Optionally, after the interventional device is completely released, the release control mechanism is retracted proximally.

[0069] Optionally, when retracting the release control mechanism proximally, first slide the intermediate pipe fitting proximally relative to the first pipe fitting to separate the base from the mounting head.

[0070] Then, the first pipe fitting and the intermediate pipe fitting are retracted into the second pipe fitting, and all the pipe fittings are retracted proximally synchronously.

[0071] Optionally, at the proximal end, a control handle is used to drive the relative movement of each pipe fitting in a hydraulic manner. Optionally, a first cylinder and a second cylinder are sequentially docked axially in the control handle. A first piston is slidably mounted in the first cylinder, and a second piston is slidably mounted in the second cylinder.

[0072] All the pipe fittings enter from the distal end of the first cylinder. The first pipe fitting is fixed to the first piston. After the intermediate pipe fitting extends out of the first piston, it enters the second cylinder through a sealing member and is fixed to the second piston. After the first pipe fitting extends out of the second piston, it is fixed to the proximal end of the second cylinder.

[0073] A hydraulic drive circuit for driving the relative movement of each pipe fitting through the piston is also configured at the control handle.

[0074] Optionally, before releasing the control member, adjustments to the interventional device are also made, including:

[0075] Slide the intermediate fitting proximally relative to the first fitting, such that the control member pulls the interventional device until the proximal end of the interventional device is constricted.

[0076] Slide the second fitting distally relative to the first fitting, such that at least a portion of the interventional device is received within the second fitting.

[0077] Optionally, the control member is a ligation thread.

[0078] Before release, the ligation thread directly or indirectly passes around the interventional device, and both ends of the ligation thread are relatively fixed to the locking member.

[0079] After release, at least one end of the ligation thread is separated from the locking member to release the restraint on the interventional device.

[0080] Optionally, one end of the ligation thread is provided with a fixed wire loop, and the other end is provided with a movable wire loop; the fixed wire loop is sleeved on the unlocking rod, and the movable wire loop is sleeved on the locking member.

[0081] Alternatively, one end of the ligation thread is fixed to the base or the mounting head, and the other end is a movable wire loop sleeved on the locking member.

[0082] Optionally, a guiding hole is formed in the mounting head, and the ligation thread passes through the guiding hole to connect to the interventional device.

[0083] Optionally, the interventional device is an inferior vena cava valve.

[0084] Optionally, a circular wire sleeve cooperating with the control member is provided at the proximal end of the interventional device.

[0085] The present application further provides an interventional device delivery system, including a release control mechanism having the foregoing structure, and a control handle for driving the release control mechanism. The proximal ends of the fittings in the release control mechanism are connected to the control handle, and the relative movement of the fittings is driven in a hydraulic manner at the control handle.

[0086] The present application further provides an interventional device delivery system, including a release control mechanism and a control handle for driving the release control mechanism. The proximal ends of the fittings in the release control mechanism are connected to the control handle, and the relative movement of the fittings is driven in a hydraulic manner at the control handle; wherein the interventional device is loaded into the release control mechanism, and the release control mechanism includes a first fitting, an intermediate fitting, and a second fitting that are slidably nested and cooperated with each other from inside to outside in sequence. The distal end of the first fitting extends out of the intermediate fitting, and a mounting head for connecting the interventional device is provided at the extended portion. A flexible control member and a locking member cooperating with the control member are connected to the intermediate fitting. The proximal end of the interventional device is restrained by the control member to the mounting head in a compressed state, and the interventional device is wrapped by the second fitting.

[0087] When the interventional device is released:

[0088] Slide the second pipe fitting proximally relative to the first pipe fitting until the interventional device is fully exposed;

[0089] Slide the intermediate pipe fitting distally relative to the first pipe fitting, causing the control member to follow distally and allowing the proximal end of the interventional device to gradually move away from the mounting head;

[0090] Drive the locking member to move to release the control member, so that the interventional device is detached from the mounting head and fully released.

[0091] Optionally, the control handle is provided with one or more cylinders, the interior of the cylinder is a hydraulic chamber, pistons are respectively slidably mounted in each hydraulic chamber, two pipe fittings adjacent in the radial direction include an outer pipe fitting and an inner pipe fitting, the outer pipe fitting enters the hydraulic chamber and is fixed to the piston in the hydraulic chamber, and the inner pipe fitting extends and is connected to the pistons of other hydraulic chambers or is fixed to the control handle.

[0092] Optionally, the multiple pipe fittings include a first pipe fitting, an intermediate pipe fitting and a second pipe fitting which are arranged in sequence from the inside to the outside, the proximal ends of the pipe fittings can move relative to each other, the proximal end of the first pipe fitting is fixedly mounted relative to the handle, and the proximal ends of the intermediate pipe fitting and the second pipe fitting are respectively fixed to the corresponding pistons.

[0093] Optionally, the distal end of the first pipe fitting is used to connect the interventional device;

[0094] The distal end of the intermediate pipe fitting is fixedly connected to the first pipe fitting for traction and bending adjustment, or the distal end of the intermediate pipe fitting can move relative to the first pipe fitting and the distal end of the intermediate pipe fitting is provided with a locking member for restricting the interventional device to the first pipe fitting;

[0095] The distal end of the second pipe fitting is used to wrap or release the interventional device; the cylinder includes a first cylinder and a second cylinder which are axially butted in sequence, wherein a first piston is slidably mounted in the first cylinder, and a second piston is slidably mounted in the second cylinder;

[0096] All the pipe fittings enter from the distal end of the first cylinder, wherein the first pipe fitting is fixed to the first piston, after the intermediate pipe fitting extends out of the first piston, it enters the second cylinder through a sealing member and is fixed to the second piston, and after the first pipe fitting extends out of the second piston, it is fixed to the proximal end of the second cylinder.

[0097] Optionally, a distal hydraulic chamber is provided at the distal end of the catheter system for driving the release of the interventional device; a distal piston is slidably mounted in the distal hydraulic chamber, and the interventional device is detachably connected to the distal piston.

[0098] Optionally, the control handle includes a working part for mounting the cylinder and a holding part connected to the working part, the working part has a distal end and a proximal end opposite to each other, and the holding part is connected to the proximal end of the working part.

[0099] Optionally, a hydraulic drive circuit for driving the pipes to move relative to each other through the piston is further configured at the control handle; the hydraulic drive circuit includes:

[0100] A hydraulic pipeline, used to provide a liquid channel communicating with each hydraulic chamber;

[0101] A driving pump connected to the hydraulic pipeline to drive the flow of liquid;

[0102] A control valve is connected to the hydraulic pipeline to control the flow direction of the liquid.

[0103] Optionally, the hydraulic drive circuit further includes a liquid storage tank connected to the hydraulic pipeline for temporarily storing liquid.

[0104] The control valve comprises:

[0105] The multi-way switching valve has a driving side interface connected to the inlet and outlet of the driving pump, and multiple working side interfaces, wherein every two working side interfaces are connected to one of the hydraulic chambers. The multi-way switching valve has multiple gears for switching the connection relationship between the driving side interface and different working side interfaces to control the flow direction of the liquid.

[0106] Optionally, the control valve further includes:

[0107] Two one-way valves, the outlet of the driving pump is connected to one of the driving side interfaces through the first one-way valve; the inlet of the driving pump is connected to the other driving side interface through the second one-way valve and the liquid storage tank in sequence;

[0108] The multi-way switching valve is embedded in the control handle, and the control handle is provided with a mark indicating the gear position of the multi-way switching valve.

[0109] Optionally, the outermost sleeve of the multiple pipes is provided with a protective tube, the proximal end of the protective tube is connected to the fixed sleeve, the radial gap between the outermost pipe among the multiple pipes and the protective tube is an exhaust gap, and the side wall of the fixed sleeve is provided with an exhaust hole connected to the exhaust gap.

[0110] Optionally, the cylinder includes a first cylinder and a second cylinder that are connected in sequence from the distal end to the proximal end, wherein a first piston is slidably installed in the first cylinder, and a second piston is slidably installed in the second cylinder, and the multiple pipes include a first pipe, an intermediate pipe, and a second pipe coaxially arranged from the inside to the outside;

[0111] All pipes enter from the distal end of the first cylinder, wherein the first pipe is fixed to the first piston, the intermediate pipe extends out of the first piston, enters the second cylinder and is fixed to the second piston, and the first pipe extends out of the second piston and is fixed to the proximal end of the second cylinder.

[0112] Optionally, the protective tube is fixedly plugged into one axial end of the fixing sleeve, the other axial end of the fixing sleeve is a connecting end, the connecting end is inserted into the distal end of the cylinder and fixed to the cylinder by a buckle, and the outer periphery of the connecting end is sleeved with a distal sealing plug that matches the inner wall of the cylinder;

[0113] The distal sealing plug is provided with an avoidance hole, and the outermost tube among the plurality of tubes is slidingly and sealingly matched with the avoidance hole.

[0114] Optionally, the connecting end has an outer flange, and the distal sealing plug is sleeved on the outer flange.

[0115] Optionally, the outer periphery of the distal sealing plug is provided with at least two convex rings spaced apart in the axial direction, and each convex ring is sealingly matched with the inner wall of the cylinder.

[0116] Optionally, a positioning groove is provided on the outer periphery of the fixing sleeve, and the control handle has two half shells that are buckled with each other, and the edges of the two half shells are snapped into the positioning groove.

[0117] Optionally, a blocking step is provided on the inner wall of the fixing sleeve, and the proximal end surface of the protection tube abuts against the blocking step.

[0118] Optionally, a positioning plate is provided on the outer wall of the fixing sleeve, and the distal end surface of the cylinder barrel abuts against the positioning plate.

[0119] Optionally, a positioning hole is formed on the side wall of the cylinder, and the buckle includes an elastic arm extending from the positioning plate into the cylinder, and a hook at the end of the elastic arm and cooperating with the positioning hole.

[0120] Optionally, one side of the hook in the circumferential direction has a chamfered structure for guiding the hook to rotate out of the positioning hole along the circumferential direction.

[0121] Optionally, the side wall of the fixing sleeve has a thickened area, and the exhaust hole is opened in the thickened area.

[0122] Optionally, along the axial direction of the fixing sleeve, the exhaust hole is located between the blocking step and the positioning plate.

[0123] Optionally, the cylinder barrel includes a plurality of barrel sections axially butted in sequence, and adjacent barrel sections are connected by a partition seal. One of the plurality of pipe fittings slidably seals through the partition seal, and the partition seal is detachably connected to the adjacent barrel sections by a snap connection method.

[0124] Optionally, the cylinder barrel includes a first barrel section and a second barrel section axially butted in sequence. A first piston is slidably installed in the first barrel section, and a second piston is slidably installed in the second barrel section. The pipe fitting includes a first pipe fitting, an intermediate pipe fitting, and a second pipe fitting coaxially arranged from the inside to the outside.

[0125] All the pipe fittings enter from the distal end of the first barrel section. The first pipe fitting is fixed to the first piston. After the intermediate pipe fitting extends out of the first piston, it enters the second barrel section through the partition seal and is fixed to the second piston. After the first pipe fitting extends out of the second piston, it is fixed to the proximal end of the second barrel section.

[0126] Optionally, the partition seal includes:

[0127] A cylinder body having an axis. Axial ends of the cylinder body are respectively placed into the corresponding barrel sections on both sides.

[0128] Two sealing plugs respectively fixed to one axial end of the cylinder body and respectively in sealing fit with the inner walls of the corresponding barrel sections. Each sealing plug is provided with an avoidance hole for the pipe fitting to pass through.

[0129] Two groups of snaps respectively fixed to one axial end of the cylinder body and respectively engaged with the corresponding barrel sections.

[0130] Optionally, axial ends of the cylinder body are respectively provided with outward flanges, and each sealing plug is respectively fixedly sleeved on the corresponding outward flange.

[0131] Optionally, at least two axially spaced convex rings are provided on the outer periphery of the sealing plug, and the sealing plug is in sealing fit with the inner wall of the corresponding barrel section through each convex ring.

[0132] Optionally, a positioning disk is provided on the outer periphery of the cylinder body, and end faces of adjacent barrel sections respectively abut against two opposite sides of the positioning disk.

[0133] Optionally, reinforcing ribs are respectively provided between the outer periphery of the cylinder body and two opposite sides of the positioning disk.

[0134] Optionally, in the radial direction of the cylinder body, the outer edge of the reinforcing rib abuts against the inner wall of the corresponding barrel section.

[0135] Optionally, a positioning hole is opened on the wall of each cylinder, and the two groups of clips are fixed on two opposite sides of the positioning plate. Each clip includes an elastic arm extending from the positioning plate into the cylinder, and a hook at the end of the elastic arm and cooperating with the positioning hole.

[0136] Optionally, the reinforcing ribs and the buckles are evenly and alternately arranged along the circumference of the cylinder.

[0137] Optionally, the end of the hook has a guiding slope for guiding itself to enter the positioning hole along the axial direction of the cylinder.

[0138] Optionally, the hook has a chamfered structure on one circumferential side to guide itself to be rotated out of the positioning hole along the circumference of the cylinder.

[0139] Optionally, each cylinder is provided with a spare interface connected to the interior of the cylinder, and the spare interface has a standby state of closing the cylinder to maintain the internal pressure of the cylinder and an enabled state of opening the cylinder to connect to an external driving device.

[0140] Optionally, a hydraulic drive circuit for driving the relative movement of each pipe fitting through the piston is arranged at the control handle, and a connecting port for connecting to the hydraulic drive circuit is provided on the cylinder.

[0141] Optionally, each cylinder is provided with at least one of the backup interfaces, and controllable valves are independently or linked to the backup interfaces and the connecting ports.

[0142] Optionally, the backup interface and the communicating port are both arranged on the outer circumferential surface of the cylinder, and the positions of the backup interface and the communicating port correspond to each other.

[0143] Optionally, the control handle is provided with a shielding cover for shielding at least a portion of the cylinder, and the shielding cover is integrally or separately provided with the control handle.

[0144] Optionally, the shielding cover is enclosed with the control handle by a buckle, the shielding cover is arranged in the extension direction of the pipe and a first assembly part cooperating with the control handle is provided in this direction; the first assembly part is used to limit the movement of the shielding cover in the radial direction of the pipe.

[0145] Optionally, the cross-sectional shape of the shielding cover itself is U-shaped, and the interior of the U is used to accommodate the cylinder, and the first assembly part is opened at the U-shaped opening; two first assembly parts are arranged opposite to each other at the U-shaped opening of the shielding cover; the two first assembly parts have assembly positions that are close to each other and disassembly positions that are far away from each other during the process of the U-shaped opening amplitude of the shielding cover changing.

[0146] Optionally, second fittings are provided at both ends of the shielding cover in the extending direction of the pipe fitting, and the second fittings cooperate with the control handle to limit the movement of the shielding cover in the extending direction of the pipe fitting.

[0147] Optionally, a first assembly groove for cooperating with the first fitting is provided on the control handle; a second assembly groove for cooperating with the second fitting is provided on the control handle, and the first assembly groove and the second assembly groove are not coplanar and are in communication or non-communication with each other spatially.

[0148] Optionally, the shielding cover is arranged as follows:

[0149] The length of the shielding cover is less than the length of the cylinder barrel and exposes part of the cylinder barrel;

[0150] The length of the shielding cover is greater than or equal to the length of the cylinder barrel, and the shielding cover exposes part of the cylinder barrel in the form of partial hollowing.

[0151] Optionally, the liquid storage tank includes:

[0152] A tank body with a tank opening and an inlet and an outlet communicating with the hydraulic drive circuit;

[0153] A buffer bladder, which is placed in the tank body and is in sealing cooperation with the tank opening;

[0154] A gland, which is buckled with the tank body and clamps and fixes the buffer bladder with the tank opening.

[0155] Optionally, the bottom wall is provided on the side of the tank body away from the tank opening, a liquid injection port is opened on the bottom wall, and a pipeline joint is installed at the liquid injection port.

[0156] Optionally, the tank body is installed inside the control handle, and only the pipeline joint is exposed outside the control handle.

[0157] Optionally, both the inlet and the outlet of the tank body are adjacent to the bottom wall.

[0158] Optionally, the buffer bladder is made of an elastic material and changes the internal volume of the tank body through its own deformation.

[0159] Optionally, the side of the buffer bladder facing the tank opening is an open structure, and the opening part is provided with an outwardly turned edge, and the outwardly turned edge is clamped and fixed by the gland and the tank opening.

[0160] Optionally, the outwardly turned edge is provided with an annular protrusion abutting against the gland.

[0161] Optionally, the wall of the buffer bladder is provided with a corrugated structure that can be elastically deformed.

[0162] Optionally, the gland includes:

[0163] An annular frame that clamps and fixes the buffer bladder with the can mouth;

[0164] An elastic hook extending from the annular frame to the side of the tank body and cooperating with the tank body.

[0165] Optionally, the can mouth is turned outwards to form an interface platform, the annular frame clamps and fixes the buffer bladder with the top surface of the interface platform, and the elastic hook abuts against the bottom surface of the interface platform.

[0166] Optionally, the top surface of the interface platform is annularly provided with flanges that abut against the buffer bladder.

[0167] Optionally, the tank body includes a first tank body and a second tank body that communicate with each other, and the buffer bladder is arranged in the first tank body.

[0168] Optionally, the volume of the first tank body is larger than the volume of the second tank body.

[0169] Optionally, the top of the first tank body is provided with the can mouth, and the bottom of the first tank body converges in shape and transitions to the second tank body.

[0170] Optionally, a hydraulic drive circuit for driving the relative movement of each pipe fitting is configured at the control handle. The hydraulic drive circuit includes at least one drive pump for driving the flow of liquid and a control valve for controlling the flow direction of the liquid; the control handle has a holding part, the operating part of the drive pump is arranged at the holding part, and the operating part of the control valve is adjacent to the holding part.

[0171] Optionally, the control valve adopts a multi-way switching valve, and the multi-way switching valve includes:

[0172] Two relatively arranged valve seats, one of the valve seats is provided with an interface for accessing the drive side of the hydraulic drive circuit, and the other valve seat is provided with an interface for the working side of the hydraulic drive circuit;

[0173] A valve core that is sealed and clamped by the two valve seats and rotatably installed. The valve core is provided with a communication hole. When the valve core rotates to different angles, the communication hole connects the corresponding drive side interface and the working side interface;

[0174] A wrench linked to the valve core for changing the rotation angle of the valve core, and the wrench serves as the operating part of the control valve.

[0175] Optionally, the wrench and the holding part are on the same side in the radial direction of the working part.

[0176] Optionally, the wrench is located on the proximal side of the holding part, and the driving part faces the wrench.

[0177] Optionally, an anti - detachment blocking member is provided at one end of the holding portion away from the working portion.

[0178] Optionally, the anti - detachment blocking member surrounds the wrench.

[0179] Optionally, the control handle includes a working portion and a holding portion connected to the working portion. A cylinder with a piston inside is arranged in the working portion. The plurality of pipe fittings penetrate into the cylinder and are connected to the piston or fixed relative to the cylinder, and the pipe fittings are driven to move relative to each other in a hydraulic manner within the cylinder;

[0180] The cylinder communicates with corresponding working - side interfaces on both sides of the piston respectively. The hydraulic drive circuit further includes a drive pump connected to each drive - side interface for driving the liquid to flow.

[0181] Optionally, the drive pump includes:

[0182] A pump housing fixed within the control handle and connected to the hydraulic drive circuit;

[0183] A working member movably installed within the pump housing for driving the liquid to flow;

[0184] A driving member movably installed on the holding portion and linked with the working member, and the driving member serves as the operating component of the drive pump;

[0185] A return spring acting between the control handle and the driving member.

[0186] Optionally, the cylinder includes a first cylinder and a second cylinder axially butted in sequence. A first piston is slidably installed in the first cylinder, and a second piston is slidably installed in the second cylinder. The plurality of pipe fittings include a first pipe fitting, an intermediate pipe fitting, and a second pipe fitting coaxially arranged from the inside out;

[0187] All the pipe fittings enter from the distal end of the first cylinder. The first pipe fitting is fixed to the first piston. After the intermediate pipe fitting extends out of the first piston, it enters the second cylinder via a sealing spacer and is fixed to the second piston. After the first pipe fitting extends out of the second piston, it is fixed to the proximal end of the second cylinder.

[0188] Optionally, each valve seat is provided with an installation groove on the side facing the valve core. A sealing gasket is fixedly embedded in the installation groove and is in sealing contact with the valve core through the sealing gasket.

[0189] Optionally, positioning teeth engaging with each other are provided between the inner peripheral edge of the installation groove and the outer peripheral edge of the sealing gasket.

[0190] Optionally, among the two valve seats, one valve seat is the first valve seat provided with the driving side interface, and the other valve seat is the second valve seat provided with the working side interface;

[0191] On the side of the first valve seat facing the valve core, a liquid inlet hole communicating with the driving side interface is opened, and a first liquid passing hole corresponding to the position of the liquid inlet hole and communicating with each other is provided on the first sealing gasket;

[0192] On the side of the second valve seat facing the valve core, a liquid outlet hole communicating with the working side interface is opened, and a second liquid passing hole corresponding to the position of the liquid outlet hole and communicating with each other is provided on the second sealing gasket;

[0193] When the valve core rotates to different angles, the communication holes on the valve core communicate the corresponding first liquid passing hole and the second liquid passing hole.

[0194] Optionally, there are two liquid inlet holes, and relative to the rotation axis of the valve core, each liquid inlet hole is at a different radial position; the first liquid passing hole is matched with the corresponding liquid inlet hole in position;

[0195] On the side of the valve core facing the first valve seat, two inner and outer annular grooves are opened, each annular groove communicates with one of the liquid inlet holes, and there are two communication holes which are respectively communicated with one of the annular grooves.

[0196] Optionally, the wrench includes an annular sleeve located on the outer periphery of the valve core, and a hook portion fixed to the annular sleeve and extending to the outside of the control handle; a one-way clutch mechanism is linked between the inner edge of the annular sleeve and the outer periphery of the valve core through mutual cooperation.

[0197] Optionally, the one-way clutch mechanism includes:

[0198] Ratchet teeth distributed annularly on the outer periphery of the valve core;

[0199] Elastic claws fixed to the inner periphery of the annular sleeve;

[0200] The wrench has relative forward and reverse directions with respect to the rotation direction of the valve core. When rotating forward, the elastic claws engage with the ratchet teeth to drive the valve core. When rotating reversely, the elastic claws are deformed and slip off from the ratchet teeth, and the wrench return member drives the wrench to rotate reversely.

[0201] Optionally, the elastic claws extend along the circumferential direction of the annular sleeve and bend inward.

[0202] Optionally, 2 to 4 elastic claws are evenly distributed along the circumferential direction of the annular sleeve.

[0203] Optionally, the multi-way switching valve includes a wrench return member acting between the wrench and at least one valve seat.

[0204] Optionally, the wrench includes an annular sleeve located at the outer periphery of the valve core, and a hooking portion fixed to the annular sleeve and extending to the outside of the control handle; the inner edge of the annular sleeve and the outer periphery of the valve core are linked by a mutually cooperating one-way clutch mechanism;

[0205] The wrench reset member is a coil spring extending around the valve core axis, one end of the coil spring is connected to the valve seat, and the other end is connected to the annular sleeve.

[0206] Optionally, the coil spring is two coils arranged side by side. In the axial direction of the valve core, each coil spring is located on both sides of the annular sleeve respectively. One end of each coil spring has a positioning bend for inserting into the corresponding side valve seat, and the other ends of each coil spring are connected to each other to form a positioning cross bar. The outer periphery of the annular sleeve is provided with a groove for accommodating the positioning cross bar.

[0207] Optionally, each valve seat is provided with a plug hole for the positioning bend to be inserted into.

[0208] Optionally, the one-way clutch mechanism includes:

[0209] Ratchet teeth distributed around the outer periphery of the valve core;

[0210] An elastic claw fixed to the inner circumference of the annular sleeve;

[0211] The wrench has a relative positive direction and a reverse direction relative to the rotation direction of the valve core. During the positive rotation, the elastic claw engages with the ratchet to drive the valve core. During the reverse rotation, the elastic claw deforms and slips off the ratchet, and the wrench reset member drives the wrench to rotate in the reverse direction.

[0212] In the axial direction of the valve core, the outer periphery of the valve core includes three sections, the ratchet is fixedly distributed in the middle section, the sections on both sides are smooth sections, and the two coil springs are respectively sleeved on the smooth sections on the corresponding sides.

[0213] The interventional instrument delivery system of the present application uses a wire-controlled method at the distal end to control the release of the interventional instrument, and a hydraulic drive method can be used at the proximal end, which is convenient and quick to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0214] Figure 1 This is a structural schematic diagram of an embodiment of an interventional device delivery system of the present application;

[0215] Figure 2a This is a schematic diagram of the structure of the distal part of the interventional device delivery system of this application;

[0216] Figure 2b It is a schematic diagram of the structure of an interventional device used in an embodiment of the present application;

[0217] Figure 2c Schematic diagram of the structure of the interventional device adopted in another embodiment of the present application;

[0218] Figure 2d Schematic diagram of the structure of the interventional device in the loaded state;

[0219] Figure 2e Schematic diagram of the structure of the interventional device in the semi-released state;

[0220] Figure 2f Schematic diagram of the structure of the interventional device in the released state;

[0221] Figure 3a Schematic diagram of the internal structure of an embodiment of the interventional device delivery system of the present application;

[0222] Figure 3b is Figure 3a Schematic diagram of the structure of the interventional device delivery system after removing the movable cover and one of its half shells;

[0223] Figure 3c is Figure 3a Cross-sectional view of the interventional device delivery system;

[0224] Figure 3d Schematic diagram of the structure of the cylinder part in the interventional device delivery system;

[0225] Figure 3e is Figure 3d Schematic diagram of the structure of the cylinder in after being disassembled from the rest of the components;

[0226] Figure 3f Enlarged view of the distal part of the control handle;

[0227] Figure 3g Schematic diagram of the spare interface provided on the cylinder;

[0228] Figure 3h is Figure 3g Another perspective schematic diagram of the cylinder in ;

[0229] Figure 4 is Figure 3c Enlarged view of part C in ;

[0230] Figure 5 is Figure 3c Enlarged view of part B in ;

[0231] Figure 6a Exploded view of the fixed sleeve and the distal seal in an embodiment of the interventional device delivery system of the present application;

[0232] Figure 6b is Figure 6a Schematic diagram of the structure of the fixed sleeve and the distal seal after being assembled in ;

[0233] Figure 6c For Figure 6a Structural schematic diagram of another angle of the fixed sleeve in

[0234] Figure 6d Structural schematic diagram of the mating part of the fixed sleeve and the cylinder barrel;

[0235] Figure 7a Exploded view of the isolation seal in an embodiment of the interventional device delivery system of the present application;

[0236] Figure 7b For Figure 7a Structural schematic diagram of the assembled isolation seal in

[0237] Figure 7c For Figure 7b Structural schematic diagram of another angle of the isolation seal in

[0238] Figure 7d For Figure 3c Enlarged view of part D in

[0239] Figure 7e For Figure 7a Structural schematic diagram of the mating part of the isolation seal and two cylinder barrels in

[0240] Figure 8a Structural schematic diagram of the proximal part of the cylinder barrel;

[0241] Figure 8b Structural schematic diagram of the assembled pipeline joint and proximal sealing plug;

[0242] Figure 8c For Figure 8b Structural schematic diagram of another angle of the assembled pipeline joint and proximal sealing plug in

[0243] Figure 8d For Figure 8b Exploded view of the pipeline joint and proximal sealing plug in

[0244] Figure 9a Structural schematic diagram of the liquid storage tank in an embodiment of the interventional device delivery system of the present application;

[0245] Figure 9b For Figure 3c Enlarged view of part E in

[0246] Figure 9c For Figure 9a Exploded view of the components of the liquid storage tank in

[0247] Figure 10 Exploded view of the components of the drive pump in an embodiment of the interventional device delivery system of the present application;

[0248] Figure 11a Schematic diagram of the structure of the multi-way switching valve in an embodiment of the interventional device delivery system of the present application;

[0249] Figure 11b is Figure 11a Schematic diagram of the valve core structure of the multi-way switching valve in;

[0250] Figure 12a Schematic diagram of the structure of the multi-way switching valve in another embodiment of the interventional device delivery system of the present application;

[0251] Figure 12b is Figure 12a Schematic diagram of the structure of the multi-way switching valve from another angle in;

[0252] Figure 12c is Figure 12a Exploded view of the components of the multi-way switching valve in (valve seat held in place);

[0253] Figure 12d is Figure 12a Exploded view of the components of the multi-way switching valve from another angle in;

[0254] Figure 12e is Figure 12a Exploded view of the components of the multi-way switching valve from another angle in;

[0255] Figure 13a Schematic diagram of the hydraulic working principle in an embodiment of the interventional device delivery system of the present application;

[0256] Figure 13b is Figure 13a Enlarged view of part of gear D1 in;

[0257] Figure 14a Schematic diagram of the structure of the distal part in an embodiment of the interventional device delivery system of the present application;

[0258] Figure 14b is Figure 14a Exploded view of the locking member and related components in;

[0259] Figure 14c is Figure 14a Exploded view of the locking member and related components from another angle in;

[0260] Figure 14d is Figure 3c Enlarged view of part A in;

[0261] Figures 15a - 15c Schematic diagram of the changes of the locking member in different states;

[0262] Figures 16a - 16d Schematic diagram of the changes of the locking member together with the interventional device in different states;

[0263] Figure 17 Schematic diagram of the connection method of the lashing wire on the stent of the interventional device;

[0264] Figure 18a is Figure 17 Schematic diagram of the application scenario of the interventional device;

[0265] Figure 18b is Figure 17 Schematic diagram of the structure of the interventional device after being covered with a film;

[0266] Figure 18c is Figure 17 Schematic diagram of the stent segmentation of the interventional device;

[0267] Figures 19a - 19e Schematic diagram of the cooperation between the lashing wire and the annular wire sleeve on the stent in different embodiments.

[0268] The descriptions of the reference numerals in the figure are as follows:

[0269] 1. Pipe fitting; 11. First pipe fitting; 11a. Distal section; 11b. Proximal section; 111. Guide head; 112. Mounting head; 1121. Converging guide hole; 1122. Guide flare; 113. Pipeline joint; 1131. Positioning disk; 1132. Hook; 12. Second pipe fitting; 121. Loading section; 13. Intermediate pipe fitting; 14. Protection tube; 15. Base; 151. Proximal disk; 1511. Avoidance hole; 1512. Accommodation groove; 152. Distal disk; 1521. Wire passing groove; 1522. Lock hole; 1523. Guide hole; 153. Transition section; 16. Movable seat; 161. Annular part; 162. Locking part; 163. Unlocking rod; 1631. Trigger end; 17. Support sleeve; 171. First guide surface; 172. Second guide surface; 18. Lashing wire; 181. Fixed wire loop; 182. Movable wire loop; 19. Annular wire sleeve; 191. Crossing section;

[0270] 2. Control handle; 21. Working part; 211. Distal end; 212. Proximal end; 22. Holding part; 23. Positioning component; 24. First half shell; 25. Second half shell; 26. Positioning post; 27. Shielding cover; 271. First fitting; 272. Second fitting; 273. First assembly groove; 274. Second assembly groove; 28. Anti-disengagement blocking part;

[0271] 3. Cylinder barrel; 31. First cylinder barrel; 311. First hydraulic chamber; 312. First chamber; 313. Second chamber; 314. Communication port; 315. Communication port; 32. Second cylinder barrel; 321. Second hydraulic chamber; 322. Third chamber; 323. Fourth chamber; 324. Communication port; 325. Communication port; 326. Spare interface; 327. Spare interface; 328. Spare interface; 329. Spare interface; 33. Hydraulic pipeline; 331. First one-way valve; 332. Second one-way valve; 34. Isolation seal; 341. Cylinder body; 342. Positioning disk; 343. Flanged edge; 344. Reinforcing rib; 345. Snap; 3451. Elastic arm; 3452. Hook; 3453. Guide inclined plane; 3454. Chamfer structure; 346. Sealing plug; 3461. Convex ring; 35. Distal sealing plug; 351. Convex ring; 36. Proximal sealing plug; 361. Convex ring;

[0272] 4. First piston; 41. Support frame; 42. Sealing sleeve; 43. Through hole;

[0273] 5. Driving pump; 51. Pump housing; 52. Working part; 53. Driving part; 531. Shaft hole; 54. Inlet; 55. Outlet; 56. Return spring; 57. Pump chamber;

[0274] 6. Multi-way switching valve; 61. Valve seat; 61a. First valve seat; 61b. Second valve seat; 611. First sealing gasket; 6111. First positioning tooth; 6112. First liquid passing hole; 613. Liquid inlet hole; 614. Second positioning tooth; 615. Third positioning tooth; 616. Liquid outlet hole; 617. Second sealing gasket; 6171. Fourth positioning tooth; 6172. Second liquid passing hole; 618. Cap; 619. Jack; 62. Valve core; 621. Rotating shaft; 622. Ratchet tooth; 623. Annular groove; 624. Communication hole; 625. Smooth section; 63. Wrench; 631. Annular sleeve; 632. Elastic claw; 633. Hooking part; 634. Card slot; 64. Mark; 65. Interface; 66. Flow channel; 67. Driving side interface; 68. Working side interface; 69. Wrench reset part; 691. Positioning cross bar; 692. Positioning bend;

[0275] 7. Liquid storage tank; 71. Liquid injection port; 72. Spare joint; 73. Inlet; 74. Outlet; 75. Tank body; 75a. First tank body; 75b, Second tank body; 751. Interface platform; 752. Flange; 76. Pressing cover; 761. Elastic hook; 77. Buffer bladder; 771. Flanged edge; 772. Annular protrusion;

[0276] 8. Fixed sleeve; 81. Through hole; 82. Exhaust hole; 83. Positioning groove; 84. Flanged edge; 85. Blocking step; 86. Positioning disk; 861. Reinforcing rib; 87. Snap; 871. Elastic arm; 872. Hook; 873. Chamfer structure; 88. Thickened area;

[0277] 9. Second piston;

[0278] 10. Bracket; 101. Connecting ear; 102. Valve leaflet; 103. Dilation mask; 104. Outflow section; 105. Waist; 106. Inflow section;

[0279] 1000. Right atrium; 1100. Right ventricle; 1200. Inferior vena cava; 1300. Superior vena cava;

[0280] M1. Connection point; M2. Connection point. Detailed implementation manner

[0281] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0282] It should be noted that when a component is referred to as being "connected" to another component, it can be directly connected to the other component or there may also be an intermediate component. When a component is considered to be "disposed on" another component, it can be directly disposed on the other component or there may be an intermediate component at the same time.

[0283] It should be noted that the terms "proximal" and "distal" are relative to the operator. For example, in the catheter or sheath tube involved in the text, "proximal" refers to the end close to the operator, that is, the end that enters the body and is far from the lesion during use (for example, the end of the catheter connected to the control handle), while "distal" is the end far from the operator, that is, the end that enters the body and is close to the lesion during use (for example, the position at the end of the catheter). Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which this application belongs. The terms used in the description of this application herein are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0284] This delivery system can be used to treat heart valves (e.g., mitral valve, aortic valve, tricuspid valve, vena cava valve, pulmonary valve). For example, by loading a valve or stent at the distal end of this delivery system, it can treat aortic stenosis, mitral and tricuspid regurgitation problems, or by loading a vena cava valve and implanting a vena cava valve at the superior and inferior vena cava to solve right heart problems such as tricuspid regurgitation; this treatment can include, but is not limited to, valve replacement, valve repair or other surgeries that affect valve function. This system and method can use a transcatheter approach, such as a catheter system delivered through a vein or femoral artery; or other minimally invasive surgical methods, including but not limited to delivering a catheter through an apical approach.

[0285] See Figure 1 , the interventional device delivery system of one embodiment of the present application includes a catheter system. The catheter system includes multiple pipe fittings 1 coaxially arranged from the inside out, and a control handle 2 for driving the relative movement of the multiple pipe fittings 1. The distal ends of each pipe fitting are used to cooperate with each other to operate the interventional device, and the proximal ends of each pipe fitting are connected to the control handle 2, and the relative movement of each pipe fitting is driven by a hydraulic method at the control handle 2.

[0286] In the present application, the relative movement of each pipe fitting is driven by a hydraulic method at the control handle, which can realize the operation of the interventional device, such as release, cutting, rotation, grasping or retrieval, etc. The entire hydraulic system is configured at the proximal end, which is more convenient for on-site debugging or assembly. Even if an unexpected situation occurs, it is also convenient to solve outside the body. However, if a hydraulic mechanism is configured at the distal end, more stringent requirements are imposed on the equipment volume and safety, and the forms and directions of movement that can be regulated are also limited due to equipment problems.

[0287] The multiple pipe fittings are understood to be at least two. Specifically, sliding fit can be adopted between any two pipe fittings, that is, all parts between the two pipe fittings have an axial relative displacement during movement. Of course, if a deformable connecting piece is additionally provided between the two pipe fittings, the relative movement relationship of the connecting piece is considered separately.

[0288] It can also be that two of the pipe fittings, for example, two adjacent in the radial direction, are locally fixedly connected (for example, fixed to each other at the distal end). Since these two are only fixed to each other at the distal end, a small amount of relative displacement between them is still allowed at the proximal end. Of course, this relative movement will cause one of them to deform and bend after being transmitted to the distal end. By using this feature, the bending of the distal end of a certain pipe fitting can be realized.

[0289] The number of the pipe fittings 1 can be two, three or more. The relative movement of different pipe fittings 1 can realize corresponding operations on the interventional instrument at the distal end (far from the operator, that is, the end that enters the body near the lesion during use, and correspondingly, the proximal end is the opposite). For example, conveying, releasing, adjusting the attitude, retrieving, etc. In terms of each pipe fitting 1 itself and the realization of the distal function, it can be implemented according to the conventional technology. Of course, improvements on the distal structure of the pipe fitting are also provided in the following text. One of the key points of this application is to adopt a liquid driving method at the operation handle to drive the relative movement of different pipe fittings.

[0290] See Figure 2a , in one embodiment, multiple pipe fittings include a first pipe fitting 11, an intermediate pipe fitting 13 and a second pipe fitting 12 that are slidably nested in sequence from the inside to the outside, where:

[0291] The distal end of the first pipe fitting 11 is used to place the interventional instrument; the first pipe fitting 11 and the interventional instrument can be separated from each other in the body, that is, the interventional instrument remains in the body, or they can be connected to each other. After the operation is completed, the interventional instrument does not remain in the body, but is withdrawn to the outside of the body with the first pipe fitting 11.

[0292] The outermost distal end of the first pipe fitting 11 is a guiding head 111, and a mounting head 112 is also fixed near the proximal end of the guiding head 111. When the interventional instrument is loaded, it is located between the guiding head 111 and the mounting head 112 and is radially compressed. Generally, the interventional instrument has a connecting ear.

[0293] The connecting ear is the part where the interventional instrument is connected to the delivery system. Relative to the stent, the connecting ear can be a mesh hole on the end of the stent, or a perforated connecting part extending outward relative to the stent body. For example Figure 2b the shown connecting ear 101; in the prior art, the outer wall of the mounting head usually has a groove or a convex head for cooperating with the connecting ear of the interventional instrument. During loading, the connecting ear is engaged with the groove of the mounting head 112 or hung on the convex head to limit the axial position of the interventional instrument. For more fixing methods of the connecting ear and the mounting head, reference can be made to the patent WO2019080857A1.

[0294] The distal end of the second pipe fitting 12 is provided with a loading section for wrapping or releasing the interventional instrument. In other embodiments, a protective tube 14 fixedly connected to the control handle can also be sleeved outside the proximal end of the second pipe fitting 12.

[0295] The distal end of the intermediate pipe fitting 13 is provided with a locking member that restricts the interventional instrument to the first pipe fitting 11; the axial sliding of the intermediate pipe fitting 13 relative to the first pipe fitting 11 can make the locking member change the cooperation relationship with the mounting head on the first pipe fitting 11;

[0296] In other embodiments, the distal end of the intermediate pipe fitting 13 can be fixedly connected to the first pipe fitting 11 for traction and bending to change the attitude of the interventional instrument so as to facilitate accurate positioning.

[0297] The connection portion between the distal ends of the intermediate pipe 13 and the first pipe 11 may be adjacent to the mounting head on the first pipe 11, for example, at the proximal side of the mounting head. Of course, the distal end of the intermediate pipe 13 may also be directly fixed to the mounting head.

[0298] See also Figure 2b , Figure 2c The interventional device involved in the present application is not strictly limited in specific shape, for example, it may include a stent 10 with a connecting ear 101 at one axial end of the stent 10. The connecting ear 101 may have an expansion head at the end, or may have an annular or C-shaped connecting portion.

[0299] The stent 10 is made of nickel-titanium alloy or stainless steel, has a radially compressible or expandable structure, and is generally a mesh tube structure formed by laser cutting or weaving. The inside of the stent may or may not be sutured with a biological membrane.

[0300] Combination Figures 2d - 2f The distal end of the second tube 12 is the loading section 121. In the loading state, the interventional device is radially compressed. The loading section 121 is wrapped around the outer periphery of the interventional device to limit the radial expansion of the interventional device. After the interventional device is in place, the second tube 12 is driven by the control handle to slide axially relative to the first tube 11, so that the interventional device is gradually exposed in the human body vessels to allow the interventional device to expand radially. The interventional device enters a semi-released state from the expansion of the distal end. As the second tube 12 is further withdrawn, the interventional device is fully exposed. Finally, the connection ear of the interventional device is separated from the installation head and enters a released state, completing the release of the interventional device. During the whole process, the axial relative sliding of the first tube 11 and the second tube 12 is driven by the control handle 2.

[0301] The first tube 11 and the second tube 12 are plastic tubes or metal tubes commonly used in the field of interventional instruments, such as cut hypotubes or metal braided tubes or a mixture of metal braided tubes and hypotubes, or a mixture of polymer and metal tubes. The first tube 11 and / or the second tube 12 can also be a multi-layer composite tube.

[0302] See also Figures 3a - 3e The shape of the control handle 2 is not strictly limited. In order to facilitate the packaging of other components, a split structure can be adopted, that is, the shell of the control handle 2 includes a first half shell 24 and a second half shell 25 that are interlocked. Of course, in order to facilitate local maintenance or operation, it can also be divided into more parts.

[0303] To facilitate the mutual fixation between the first half shell 24 and the second half shell 25, various methods such as snap fasteners and fasteners can be adopted. In this embodiment, at least one of the first half shell 24 and the second half shell 25 is provided with a positioning post 26. A threaded hole is provided on the positioning post 26, and the other is correspondingly provided with a mounting hole for passing a bolt, and the two are fixed by a bolt;

[0304] Or both are provided with positioning posts 26 and the positions are matched. A positioning hole is provided on the positioning post of one, and the positioning post of the other is directly snapped into the correspondingly positioned positioning hole.

[0305] In other embodiments, the first half shell 24 and the second half shell 25 can also be fixed by snap fasteners, bonding or welding.

[0306] In different embodiments, the hydraulic cavity is directly opened inside the control handle 2, or the control handle 2 is fixedly installed with a cylinder barrel 3, and the inside of the cylinder barrel 3 is the hydraulic cavity.

[0307] There is no strict limitation on the cross-section of the cylinder barrel 3. Preferably, the outer periphery is surrounded by a smooth curve, such as a circle or an ellipse. Taking the cross-section as a circle as an example, it can be seen in the figure that its overall shape is cylindrical.

[0308] To protect the cylinder barrel 3, the first half shell 24 and the second half shell 25 enclose and surround the cylinder barrel 3. In a preferred embodiment, a positioning member 23 matching the cylinder barrel 3 is provided on the control handle 2. The positioning member 23 is one or more positioning steps, and the shape of the positioning step corresponds to the outer contour of the cylinder barrel 3 to clamp and fix the cylinder barrel 3. Although the shape of the control handle 2 is not strictly limited, for the convenience of operation, in a preferred embodiment, the control handle 2 includes a working part 21 and a holding part 22 connected to the working part 21. The cylinder barrel 3 is located inside the working part 21, that is, the working part 21 is used to provide a hydraulic cavity as a whole, and the working part 21 has opposite distal ends 211 and proximal ends 212.

[0309] The shape of the holding part 22 is convenient for holding and operating. For example, it has a length direction as a whole. Since the cylinder barrel is installed in the working part 21, taking the movement direction of the piston in the cylinder barrel as the axial direction of the cylinder barrel, in this embodiment, the length direction of the holding part 22 is substantially perpendicular to the axial direction of the cylinder barrel, or slightly obliquely intersects. As for the two parts of the working part 21 and the holding part 22, the overall shape is L-shaped. In order to further improve the holding feel and conform to the shape characteristics of the hand, in this embodiment, the overall shape of the control handle 2 is similar to the shape of a pistol. Hydraulic drive control components, such as switches, can be arranged on the holding part 22 for easy single-handed operation.

[0310] In other embodiments, the length direction of the holding part 22 can also be substantially parallel to the axial direction of the cylinder barrel, or even aligned with each other. Then the overall shape of the control handle 2 is strip-shaped.

[0311] The working part 21 and the holding part 22 adopt an integral structure or a detachable connection, which is convenient for storage with a smaller volume. The connection part between the working part 21 and the holding part 22 can adopt methods such as snap-fastening or threading for quick assembly.

[0312] In a preferred embodiment, the holding part 22 is connected to the proximal end 212 of the working part 21. And each pipe fitting passes through the control handle 2 from the distal end 211 of the working part 21 and further extends distally.

[0313] In order to adopt hydraulic drive for the relative movement of the pipe fittings, in an embodiment of the present application, the connection method of the pipe fittings and the piston is further improved. The pipe fittings are directly inserted into the cylinder barrel, making the structure more compact and improving the integration degree.

[0314] Of course, as a hydraulic drive method, sealing treatment is required at the parts where each pipe fitting enters and exits the cylinder barrel 3. According to the movement relationship of the pipe fitting relative to the cylinder barrel 3, fixed sealing or sliding sealing is correspondingly adopted.

[0315] Each communication port is arranged on the cylinder barrel 3. The hydraulic drive circuit is used to drive the piston in the cylinder barrel 3 to reciprocate. Necessary controller components such as pumps and valves can be arranged on the hydraulic drive circuit as needed. In order to further improve the integration degree, in an embodiment, the hydraulic drive circuit is arranged in the control handle 2 and used to drive the piston to make each pipe fitting move relatively. The inside of the first pipe fitting 11 can be used to thread a guide wire, etc. Therefore, the proximal end of the first pipe fitting 11 is fixed to the control handle 2. In an embodiment, a pipeline joint 113 is installed at the proximal end of the working part 21, and the first pipe fitting 11 extends and is connected to the pipeline joint 113. The pipeline joint 113 can specifically adopt a Luer joint and be butt-connected and communicated with the first pipe fitting 11. Saline can also be introduced into the first pipe fitting 11 through the pipeline joint 113 as needed to perform an exhaust operation. The proximal end of the first pipe fitting 11 can be directly fixed to the pipeline joint 113 or connected to the pipeline joint 113 through a fastening sleeve. The fastening sleeve can be filled between the outer wall of the first pipe fitting 11 and the inner wall of the pipeline joint 113 to achieve fastening and sealing.

[0316] In the matching relationship between the control handle 2 and the cylinder barrel 3, there are various setting methods. For example, the control handle 2 forms a closed space to surround the cylinder barrel 3; for another example, a part of the cylinder barrel 3 is exposed by the control handle 2; for another example, the control handle 2 is only used to provide the positioning of the cylinder barrel 3 and the cylinder barrel 3 is exposed in the circumferential direction of the cylinder barrel 3; and so on.

[0317] Refer to the appendix Figure 3aIn the disclosed embodiment, the control handle 2 is provided with a shielding cover 27 for shielding at least a portion of the cylinder 3, and the shielding cover 27 is integrally or separately provided with the control handle 2. In the embodiment shown in the drawings, the shielding cover 27 is an independent component, and when the shielding cover 27 is installed on the control handle 2, the shielding cover 27 can be enclosed with the control handle 2 to achieve the closure of the outer dimensions of the control handle 2, thereby shielding the cylinder 3.

[0318] There are many ways to install the shielding cover 27 and the control handle 2, such as using buckles and fasteners. Figure 3f In the embodiment disclosed in the invention, the shielding cover 27 is enclosed with the control handle 2 by a buckle. The shielding cover 27 is arranged in the extension direction of the pipe 1 and is provided with a first assembly part 271 cooperating with the control handle 2 in this direction. The first assembly part 271 is used to limit the movement of the shielding cover 27 in the radial direction of the pipe 1. The shielding cover 27 itself has a U-shaped cross-section, and the inside of the U-shape is used to accommodate the cylinder 3. The first assembly part 271 is opened at the U-shaped opening. Two first assembly parts 271 are arranged opposite to the U-shaped opening of the shielding cover 27. The two first assembly parts 271 have mutually approaching assembly positions and mutually distant disassembly positions during the change of the amplitude of the U-shaped opening of the shielding cover 27. The two first assembly parts 271 are kept in the assembly position under the effect of the deformation elasticity of the material of the shielding cover 27 itself. The shielding cover 27 is provided with second assembly parts 272 at both ends in the extension direction of the pipe 1, and the second assembly parts 272 cooperate with the control handle 2 to limit the movement of the shielding cover 27 in the extension direction of the pipe 1. The first assembly part 271 and the second assembly part 272 are convex ribs arranged on the inner surface of the shielding cover 27. The control handle 2 is provided with a first assembly groove 273 that matches the first assembly part 271. The control handle 2 is provided with a second assembly groove 274 that matches the second assembly part 272. The first assembly groove 273 and the second assembly groove 274 are not coplanar. In a specific setting, the planes where the first assembly groove 273 and the second assembly groove 274 are located are perpendicular to each other. In space, the first assembly groove 273 and the second assembly groove 274 are connected to each other or not connected.

[0319] In the extension direction of the pipe fitting 1, the length of the shielding cover 27 is greater than, equal to, or less than the length of the cylinder barrel 3. Different length relationships actually correspond to the covering capacity of the shielding cover 27 for the cylinder body. In addition to the change in size, the shielding cover 27 can also expose part of the cylinder barrel 3 by partially hollowing out. For example, in other embodiments, the shielding cover 27 can also be set as a semi-open structure. For example, the shielding cover 27 shields the cylinder barrel 3 as a whole, but a local opening is provided for the cylinder barrel 3 to set a joint. The shielding cover 27 is also provided with a dust cap (not shown) with a corresponding interface. The dust cap can be a structure integrated with the shielding cover or a separate component.

[0320] refer to Figure 3dIn the illustrated embodiment, the first cylinder 31 further has communication ports 314 and 315 for connecting to a hydraulic drive circuit. A proximal seal plug 36 is provided at the proximal end of the second cylinder 32, and the second cylinder 32 also has communication ports 324 and 325 for connecting to a hydraulic drive circuit. Each communication port is used to achieve the driving effect of the cylinder on different pipelines, and the specific connection effect will be specifically explained below. As described in the background art, there are many components in the control handle and the mating relationship is complex, so there is a risk of failure.

[0321] Reference Figure 3g and Figure 3h In the illustrated embodiment, the interventional device delivery system includes a plurality of coaxial tubes arranged from the inside out, and a control handle 2 for driving the relative movement of the plurality of tubes. The distal ends of the tubes are used to cooperate with each other to operate the interventional device, and the proximal ends of the tubes are connected to the control handle 2. At the control handle 2, the relative movement of the tubes is driven hydraulically;

[0322] One or more cylinders are provided inside the control handle. Pistons are respectively slidably installed in each cylinder 3. Two tubes adjacent to each other in the radial direction include an outer tube and an inner tube. The outer tube enters the cylinder and is fixed to the piston in the cylinder, and the inner tube extends and is connected to the piston of other cylinders or fixed to the control handle;

[0323] The cylinder is provided with a spare interface communicating with the inside of the cylinder. The spare interface has a standby state for closing the cylinder to maintain the internal pressure of the cylinder and an enabled state for opening the cylinder to connect to an external drive device.

[0324] Similarly to the communication ports 314, 315, 324, and 325, multiple spare interfaces can also be provided. As shown in the reference drawings, the first cylinder 31 further has spare interfaces 326 and 327 for connecting to a hydraulic drive circuit. The second cylinder 32 also has spare interfaces 328 and 329 for connecting to a hydraulic drive circuit. The spare interfaces do not function when the cylinder and the hydraulic pipeline are working normally. Referring to the description of the shielding cover above, they are stored in the operation handle. In case of an accident, they can be used to connect to an external drive device. The external drive device is used to provide power for the movement of the cylinder. The external drive device can be a commonly used fluid pump delivery device in clinical practice, such as a plunger pump, a diaphragm pump, an electromagnetic pump, etc.

[0325] The number of spare interfaces can also be changed. For example, in the embodiment disclosed in the drawings, four spare interfaces are provided corresponding to the communication ports to ensure the full functions of the hydraulic pipeline under normal conditions and improve stability.

[0326] For example, in another embodiment, a total of three spare interfaces are provided on the cylinder, and the spare interface for pushing the second sheath to the distal end is omitted. The main reason for this setting is that the omitted spare interface is used to realize the actual function of retrieving the interventional instrument. In the actual treatment process, retrieving the interventional instrument itself is a seldom-occurring situation. Therefore, in some products, there is no need to set a spare interface for this purpose to avoid excessive redundancy.

[0327] In the setting of the spare interface, combined with the description of the shielding cover above, the spare interface is set toward the shielding cover. It is convenient for the shielding cover to cover or open the spare interface. The spare interfaces are arranged at intervals. The spacing between the intervals can achieve effective driving of the cylinder. The positions of the spare interface and the connecting port correspond to each other. This setting can ensure that the spare interface can achieve all the functions of the cylinder under normal conditions of the connecting port.

[0328] In order to facilitate observation of the working condition of the hydraulic system, the shielding cover 27 can be made of transparent material, and of course, the parts of the first half shell 24 and the second half shell 25 in the housing of the control handle 2 corresponding to the area to be observed can also be made of transparent material, such as the parts corresponding to the control valve or the liquid storage tank.

[0329] Correspondingly, the spare interface and the connecting port are independently or linked with controllable valves. When a problem occurs in the pipeline, the unreliable pressure relief of the fluid in the cylinder can be prevented, thereby ensuring the stable operation of the operating handle.

[0330] The control handle 2 is provided with a first cylinder 31 and a second cylinder 32, which respectively provide a first hydraulic chamber 311 and a second hydraulic chamber 321. A first piston 4 is slidably mounted in the first hydraulic chamber 311, and a second piston 9 is slidably mounted in the second hydraulic chamber 321. The first cylinder 31 and the second cylinder 32 are coaxially arranged and butted against each other, and an isolation seal 34 is provided at the butt joint.

[0331] The proximal end of the second pipe 12 penetrates the first hydraulic chamber 311 and is fixedly connected to the first piston 4. The proximal end of the intermediate pipe 13 extends out of the first piston 4 and then slides and seals through the isolation seal 34 to enter the second hydraulic chamber 321. The proximal end of the intermediate pipe 13 is fixed to the second piston 9 in the second hydraulic chamber 321. The proximal end of the first pipe 11 extends out of the second piston 9 and then is fixedly connected to the control handle 2. The first piston 4 divides the first hydraulic chamber 311 into a first chamber 312 and a second chamber 313. The second piston 9 divides the second hydraulic chamber 321 into a third chamber 322 and a fourth chamber 323. Each chamber is connected to the hydraulic drive circuit through a corresponding connecting port.

[0332] The first chamber 312 and the second chamber 313 are divided according to the first piston 4, and the third chamber 322 and the fourth chamber 323 are divided according to the second piston 9. Since the positions of the two pistons are movable, the volume of each chamber also changes accordingly and is not fixed.

[0333] When only the first piston 4 moves toward the distal end, the second pipe member 12 is driven to move toward the distal end, while the positions of the first pipe member 11 and the intermediate pipe member 13 remain unchanged. The same is true when the first piston 4 moves toward the proximal end.

[0334] When only the second piston 9 moves toward the distal end, the intermediate pipe 13 is driven to move toward the distal end, while the positions of the first pipe 11 and the second pipe 12 remain unchanged. The same applies when the second piston 9 moves toward the proximal end.

[0335] The first cylinder 31 and the second cylinder 32 are coaxially arranged and butted against each other through an isolation seal 34. A distal sealing plug 35 is provided at the distal end of the first cylinder 31. The first cylinder 31 also has a connecting port 314 and a connecting port 315 for connecting to the hydraulic drive circuit arranged on both sides of the first piston 4. A proximal sealing plug 36 is provided at the proximal end of the second cylinder 32. The second cylinder 32 also has a connecting port 324 and a connecting port 325 for connecting to the hydraulic drive circuit arranged on both sides of the second piston 9.

[0336] The second tube 12 is connected to the first piston 4 by a sliding seal through the distal sealing plug 35, the intermediate tube 13 and the first tube 11 extend the first piston 4 inside the second tube 12, the intermediate tube 13 is further connected to the second piston 9 by a sliding seal through the isolation seal 34, the first tube 11 extends the second piston 9 inside the intermediate tube 13, and is further connected to the pipe joint 113 of the control handle 2 by a fixed seal through the proximal sealing plug 36.

[0337] A piston is disposed in each hydraulic chamber. Each piston can adopt the same structure, but only the position and the pipes passing through are different, but it does not affect its structural characteristics and working principle.

[0338] See also Figure 4 In one embodiment, two tubes adjacent in radial direction include an outer tube, i.e., a second tube 12, and an inner tube, i.e., an intermediate tube 13. The first piston 4 includes a support frame 41. Both ends of the support frame 41 in the axial direction have flanges turned outward. Each flange is fixed with a sealing sleeve 42. The two sealing sleeves 42 are respectively used as: a fixed sealing part, which is sleeved on the second tube 12 and fixedly seals with the outer wall of the second tube 12 according to the matching relationship with the tube;

[0339] The sliding sealing part is sleeved on the middle pipe 13 and cooperates with the outer wall of the middle pipe 13 in a sliding sealing manner;

[0340] The support frame 41 and each sealing sleeve 42 are both provided with an axial through hole 43 for the pipe fitting to pass through. The sealing sleeve 42 can be made of elastic materials such as rubber for convenient sealing fit.

[0341] The fixed sealing part and the sliding sealing part are fixedly connected relative to each other through the support frame 41, and the outer peripheries of both are in sliding sealing fit with the inner wall of the first cylinder 31. The first piston 4 is fixedly connected to the second pipe fitting 12 and is in sliding fit with the intermediate pipe fitting 13. Therefore, when the first piston 4 moves, it can drive the second pipe fitting 12, but does not affect the position of the intermediate pipe fitting 13. The second piston 9 is the same. For example, in an embodiment, two adjacent pipe fittings in the radial direction include the outer layer pipe fitting, i.e., the intermediate pipe fitting 13, and the inner layer pipe fitting, i.e., the first pipe fitting 11. The second piston 9 is provided with a through hole extending along the axis. The proximal end of the intermediate pipe fitting 13 is fixedly connected in the through hole, that is, the second piston 9 is fixedly connected to the intermediate pipe fitting 13 and is in sliding fit with the first pipe fitting 11. Therefore, when the second piston 9 moves, it can drive the intermediate pipe fitting 13, but does not affect the position of the first pipe fitting 11. The proximal end of the first pipe fitting 11 passes through the second hydraulic chamber and is fixedly connected to the pipeline joint 113.

[0342] The radial gap between two adjacent pipe fittings in the radial direction is the exhaust gap. Each exhaust gap can be individually filled with physiological saline for exhaust, or can be connected to a unified hydraulic drive circuit to implement exhaust. It can give full play to the auxiliary function of hydraulic drive, exhaust by means of liquid perfusion, and also saves additional exhaust equipment.

[0343] In order to establish a stable intervention channel, in an embodiment, a protective tube 14 is further sleeved outside the second pipe fitting 12, and the proximal end of the protective tube 14 is fixed to the control handle 2.

[0344] The protective tube 14 is fixedly installed relative to the control handle and is located outside the second pipe fitting 12. Implementing the intervention through the channel established by the protective tube 14 can avoid scratching the blood vessel when the second pipe fitting 12 reciprocates. The length of the protective tube 14, that is, the position of its distal end, can be determined according to the length of the intervention path. The proximal end of the protective tube 14 is fixed on the distal side of the control handle 2. The proximal end of the second pipe fitting 12 passes through the protective tube 14 and then enters the first cylinder.

[0345] In order to facilitate the installation of the proximal end of the protective tube 14, in an embodiment, a fixing sleeve 8 is installed on the control handle. The proximal end of the protective tube 14 is in sealed butt joint with the distal end of the fixing sleeve 8. The proximal end of the second pipe fitting 12 passes through the fixing sleeve 8 via the protective tube 14 and further extends into the first hydraulic chamber.

[0346] Since the protective tube 14 and the second pipe fitting 12 need to slide relative to each other, a radial gap is sometimes reserved, and it is necessary to exhaust the radial gap during the operation.

[0347] Combined Figures 5 - 6d , Figures 3a - 3e, in one embodiment, an interventional device delivery system is provided, including multiple pipe fittings coaxially arranged from the inside out, and a control handle 2 for driving the relative movement of the multiple pipe fittings. The distal ends of the pipe fittings are used to cooperate with each other to operate the interventional device, and the proximal ends of the pipe fittings are connected to the control handle 2. A cylinder 3 with a piston inside is configured at the control handle 2. The distal end of the cylinder 3 is hermetically docked with a fixed sleeve 8. The multiple pipe fittings pass through the fixed sleeve 8 and enter the cylinder 3 and are connected to the piston or fixed relative to the cylinder 3. The piston is driven hydraulically in the cylinder 3 to make the pipe fittings move relative to each other;

[0348] A protective tube 14 is sleeved on the outermost periphery of the multiple pipe fittings. The proximal end of the protective tube 14 is connected to the fixed sleeve 8. The radial gap between the outermost pipe fitting among the multiple pipe fittings and the protective tube 14 is an exhaust gap. An exhaust hole 82 communicating with the exhaust gap is provided on the side wall of the fixed sleeve 8.

[0349] The above embodiments can be combined. For example, the cylinder 3 includes a first cylinder 31 and a second cylinder 32 docked in sequence from the distal end to the proximal end. A first piston 4 is slidably installed in the first cylinder 31, and a second piston 9 is slidably installed in the second cylinder 32. The multiple pipe fittings include a first pipe fitting 11, an intermediate pipe fitting 13, and a second pipe fitting 12 coaxially arranged from the inside out;

[0350] All the pipe fittings enter from the distal end of the first cylinder 31. The first pipe fitting 11 is fixed to the first piston 4. After the intermediate pipe fitting 13 extends out of the first piston 4, it enters the second cylinder 32 and is fixed to the second piston 9. After the first pipe fitting 11 extends out of the second piston 9, it is fixed to the proximal end of the second cylinder 32.

[0351] The fixed sleeve 8 is provided with a through hole 81. The proximal end of the protective tube 14 extends into the through hole 81 and is hermetically and fixedly connected to the hole wall by bonding, welding, interference fit and other means. The fixed sleeve 8 and the control handle 2 can be fixed by clamping or using fasteners and other means. In one embodiment, a circular positioning groove 83 is provided on the outer periphery of the fixed sleeve 8. The control handle 2 has two half shells that are buckled with each other. The edges of the two half shells are clamped with the positioning groove 83. For example, it can be seen in the figure that the corresponding part of the first half shell 24 is clamped into the positioning groove 83 to limit the axial position of the fixed sleeve 8.

[0352] Since the second pipe fitting 12 needs to slide back and forth, the proximal end of the fixed sleeve 8 is in sliding seal cooperation with the outer wall of the second pipe fitting 12. This sliding seal cooperation can be either that the inner wall of the through hole 81 is in direct contact with the outer wall of the second pipe fitting 12, or indirect cooperation through other components.

[0353] The protective tube 14 is fixedly inserted into one axial end of the fixing sleeve 8. The other axial end of the fixing sleeve 8 is a connection end, which is inserted into the distal end of the first cylinder 31 and fixed to the first cylinder 31 by a buckle 87. A distal end seal plug 35 that mates with the inner wall of the first cylinder 31 is sleeved on the outer periphery of the connection end.

[0354] An avoidance hole is provided on the distal end seal plug 35, and the outermost pipe fitting among the plurality of pipe fittings, i.e., the second pipe fitting 12, is in sliding seal fit with the avoidance hole.

[0355] In order to ensure the connection effect and facilitate assembly, in one embodiment, the connection end has an outwardly turned edge 84, and the distal end seal plug 35 is sleeved on the outwardly turned edge 84. The distal end seal plug 35 is made of an elastic material such as rubber, which is convenient for installation on the one hand and can also ensure the sealing effect. As a preferred embodiment, at least two axially spaced convex rings 351 are provided on the outer periphery of the distal end seal plug 35, and the distal end seal plug 35 is in sealing fit with the inner wall of the first cylinder 31 through each convex ring 351.

[0356] In order to accurately assemble the axial relative position between the protective tube 14 and the fixing sleeve 8, in one embodiment, a blocking step 85 is provided on the inner wall of the fixing sleeve 8, and the proximal end face of the protective tube 14 abuts against the blocking step 85.

[0357] In order to accurately assemble the fixing sleeve 8 and the first cylinder 31, while fixing the fixing sleeve 8 to the first cylinder 31 by the buckle 87, in one embodiment, a positioning disk 86 is provided on the outer wall of the fixing sleeve 8, and the distal end face of the first cylinder 31 abuts against the positioning disk 86.

[0358] On the side of the positioning disk 86 facing the inside of the first cylinder 31, there is a reinforcing rib 861. The reinforcing rib 861 can not only stabilize the positioning disk 86, but also abut against the inner wall of the first cylinder 31 after entering the first cylinder 31 to prevent the fixing sleeve 8 from radially shaking. In the circumferential direction of the fixing sleeve 8, the reinforcing rib 861 and the buckle 87 can be alternately arranged at intervals. For example, two reinforcing ribs 861 and two buckles 87 are provided and are evenly alternately arranged in the circumferential direction.

[0359] After the buckle 87 and the first cylinder 31 are axially inserted into each other, accidental loosening can be prevented. Of course, in order to facilitate the assembly of the buckle 87 in place, in one embodiment, a positioning hole is provided on the side wall of the first cylinder 31. The buckle 87 includes an elastic arm 871 extending from the positioning disk 86 into the first cylinder 31, and a hook 872 at the end of the elastic arm 871 that mates with the positioning hole.

[0360] At least two snap fasteners 87 are circumferentially distributed along the fixed sleeve 8, and are preferably evenly spaced. The axial end of the hook 872 has a slight chamfer. When inserting into the first cylinder 31, it can guide the deformation of the elastic arm 871 to allow each snap fastener 87 to enter the first cylinder 31 until the hook 872 is seated in the positioning hole. At this time, the elastic arm 871 resets to lock the fixed sleeve 8 to the first cylinder 31.

[0361] During normal disassembly, tools are required to radially push each snap fastener inward to disengage the hook 872 from the positioning hole and then pull it out axially. However, the operation is too cumbersome and requires tools. In a preferred embodiment, one side of the hook 872 in the circumferential direction is provided with a chamfer structure 873 for guiding the hook 872 to rotate out of the positioning hole circumferentially.

[0362] When disassembly is required, the fixed sleeve 8 and the first cylinder 31 are rotated relative to each other. The chamfer structure 873 is radially inward under the action of the inner edge of the positioning hole, and then the hook 872 is extruded out of the positioning hole. Then, the fixed sleeve 8 is pulled out axially, and the operation is more concise and does not require special tools.

[0363] In order to maintain the structural strength around the exhaust hole 82, in one embodiment, the side wall of the fixed sleeve 8 is provided with a thickened area 88, and the exhaust hole 82 is opened in the thickened area 88.

[0364] Axially, the exhaust gap between the protection tube 14 and the first pipe fitting 11 is open at the proximal side of the protection tube 14. Therefore, the exhaust hole 82 is located between the blocking step 85 and the positioning disk 86.

[0365] The exhaust hole 82 can be individually connected to a pipeline for exhaust. In order to make full use of the existing hydraulic drive circuit, the exhaust hole 82 can be connected to the hydraulic drive circuit. For example, one of the working side interfaces of a multi-way switching valve is connected to the exhaust hole 82. The multi-way switching valve has multiple gears, and in one gear, the outlet of the drive pump is connected to the exhaust hole 82, so that exhaust can be carried out by means of liquid perfusion.

[0366] See Figures 7a - 7e Combined with Figures 3a - 3e This embodiment provides an interventional device delivery system, including multiple pipe fittings 1 coaxially arranged from inside to outside, and a control handle 2 for driving the relative movement of the multiple pipe fittings 1. The distal ends of the pipe fittings are used to cooperate with each other to operate the interventional device. The proximal ends of the pipe fittings are connected to the control handle 2. A cylinder 3 with a piston inside is configured at the control handle 2. The multiple pipe fittings 1 pass through the cylinder 3 and are connected to the piston or fixed relative to the cylinder 3, and the relative movement of the pipe fittings is driven hydraulically inside the cylinder 3;

[0367] The cylinder barrel 3 includes a plurality of axially connected in sequence, and adjacent cylinder barrels are connected by a partition seal 34. One of the plurality of pipe fittings penetrates through the partition seal 34 in a sliding seal manner, and the partition seal 34 is detachably connected to the adjacent two cylinder barrels by a snap 345.

[0368] The relative movement of each pipe fitting is driven hydraulically. A cylinder barrel with a piston can be used and a hydraulic pipeline can be configured accordingly. Of course, the above embodiments can also be combined. This embodiment makes improvements to the connection of multiple cylinder barrels. The two ends of the partition seal 34 are respectively in sealing cooperation with each cylinder barrel, and are positioned by snaps both axially and circumferentially on the cylinder barrel, so as to facilitate quick disassembly and assembly.

[0369] In one embodiment, the cylinder barrel includes a first cylinder barrel 31 and a second cylinder barrel 32 axially butted in sequence. A first piston 4 is slidably installed in the first cylinder barrel 31, and a second piston 9 is slidably installed in the second cylinder barrel 32. The pipe fittings include a first pipe fitting 11, an intermediate pipe fitting 13, and a second pipe fitting 12 coaxially arranged from inside to outside.

[0370] All pipe fittings enter from the distal end of the first cylinder barrel 31. The first pipe fitting 11 is fixed to the first piston 4. After the intermediate pipe fitting 13 extends out of the first piston 4, it enters the second cylinder barrel 32 through the partition seal 34 and is fixed to the second piston 9. After the first pipe fitting 11 extends out of the second piston 9, it is fixed to the proximal end of the second cylinder barrel 32.

[0371] In one embodiment, the partition seal 34 includes:

[0372] A cylinder body 341. The cylinder body 341 has an axis, and the two axial ends of the cylinder body 341 are respectively placed into the corresponding cylinder barrels on both sides.

[0373] Two sealing plugs 346. The two sealing plugs 346 are respectively fixed to one axial end of the cylinder body and are respectively in sealing cooperation with the inner walls of the corresponding cylinder barrels. Each sealing plug 346 is respectively provided with an avoidance hole for the pipe fitting to pass through.

[0374] Two groups of snaps 345. The two groups of snaps 345 are respectively fixed to one axial end of the cylinder body 341 and are respectively engaged with the corresponding cylinder barrels on both sides.

[0375] The distal end and the proximal end of the partition seal 34 adopt a symmetrical structure, that is, they are connected to each cylinder barrel with the same structural characteristics. Therefore, the following description mainly takes one side as an example, and the other side is the same.

[0376] The sealing plug 346 is made of an elastic material such as rubber to facilitate sealing. To facilitate the installation of the sealing plug 346, the axial ends of the cylinder body 341 are respectively provided with outward flanges 343, and each sealing plug 346 is fixedly sleeved on the corresponding outward flange 343. At least two axially spaced convex rings 3461 are provided on the outer periphery of the sealing plug 346, and the convex rings 3461 are in sealing cooperation with the inner wall of the corresponding cylinder barrel. Each convex ring 3461 can form an independent seal to further ensure the sealing effect.

[0377] In order to maintain the stability of the relative position, in one embodiment, a positioning disk 342 is provided on the outer periphery of the cylinder body 341, and the end faces of two adjacent cylinder barrels respectively abut against two opposite sides of the positioning disk 342.

[0378] As can be seen in the figure, the first cylinder barrel 31 abuts against the distal side of the positioning disk 342, and the second cylinder barrel 32 abuts against the proximal side of the positioning disk 342. The positioning disk 342 not only positions and supports each cylinder barrel, but also makes the structure between the two cylinder barrels more compact.

[0379] Since the thickness of the positioning disk 342 is limited, in order to ensure the structural strength, in one embodiment, reinforcing ribs 344 are respectively provided between the outer periphery of the cylinder body 341 and two opposite sides of the positioning disk 342. The reinforcing ribs 344 can prevent the deformation of the positioning disk 342 in the axial direction and improve the overall stiffness of the positioning disk 342.

[0380] In a preferred embodiment, in the radial direction of the cylinder body 341, the outer edge of the reinforcing rib 344 abuts against the inner wall of the corresponding cylinder barrel. Through the support of the reinforcing rib 344, the two cylinder barrels can be further stabilized in the radial direction.

[0381] The reinforcing ribs 344 and the buckles 345 are alternately arranged at intervals. For example, on the same side of the positioning disk 342, two reinforcing ribs 344 and two buckles 345 are provided and are evenly arranged alternately in the circumferential direction.

[0382] After the buckles 345 are axially inserted into the corresponding cylinder barrels, accidental loosening can be prevented. Of course, for the convenience of assembly, that is, for the buckles 345 to be easily positioned, in one embodiment, positioning holes are provided on the barrel walls of each cylinder barrel, two groups of buckles are fixed on two opposite sides of the positioning disk 342, and each buckle includes an elastic arm 3451 extending from the positioning disk 342 into the cylinder barrel and a hook 3452 at the end of the elastic arm 3451 and cooperating with the positioning hole.

[0383] The end of the hook 3452 is provided with a guiding inclined surface 3453 for guiding itself to enter the positioning hole along the axial direction of the cylinder body. When inserting into the cylinder barrel, the elastic arm 3451 can be guided to deform to allow each buckle 345 to enter the corresponding cylinder barrel until the hook 3452 is positioned in the positioning hole. At this time, the elastic arm 3451 resets to lock the isolation seal 34 to the connected cylinder barrel.

[0384] During normal disassembly, tools are required to radially push each buckle inward to disengage the hook 3452 from the positioning hole and then pull it out axially. However, the operation is too cumbersome. In a preferred embodiment, one side of the hook 3452 in the circumferential direction is provided with a chamfer structure 3454 for guiding the hook 3452 to rotate out of the positioning hole circumferentially.

[0385] When disassembly is required, the isolation seal 34 and the cylinder barrel are rotated relative to each other. The chamfer structure 3454 radially squeezes the hook 3452 inward under the action of the inner edge of the positioning hole to disengage the hook 3452 from the positioning hole, and then the isolation seal 34 and the cylinder barrel are axially pulled apart. The operation is more concise and does not require the use of special tools.

[0386] See Figures 8a - 8d , in an embodiment, a pipeline joint 113 is provided. For example, a positioning hole is formed in the proximal barrel wall of the second cylinder barrel 32. The outer periphery of the pipeline joint 113 is provided with a positioning disk 1131. The end face of the second cylinder barrel 32 abuts against the positioning disk 1131. The positioning disk 1131 is also provided with a hook 1132 extending into the second cylinder barrel 32 and cooperating with the positioning hole. One side of the hook 1132 in the circumferential direction is provided with a chamfer structure for guiding the hook 1132 to enter and exit the positioning hole of the second cylinder barrel 32.

[0387] The distal end of the pipeline joint 113 has a flanged edge. The proximal seal plug 36 is sleeved on the flanged edge. The outer periphery of the proximal seal plug 36 is provided with two convex rings 361 and is hermetically fitted with the inner wall of the second cylinder barrel 32 through these two convex rings 361.

[0388] The proximal part of the pipeline joint 113 is provided with a quick-connect structure in the form of a thread or other means for facilitating connection to an external pipeline. The distal part of the pipeline joint 113 is relatively fixed to the first pipe fitting 11 and communicates with each other.

[0389] The proximal seal plug 36 is provided with an avoidance hole. The proximal end of the first pipe fitting 11 can extend into and be fixed in the avoidance hole or further extend and be fixed to the inner wall of the pipeline joint 113.

[0390] See Figures 3a - 3e , in an embodiment of the present application, in order to further improve the integration degree, a hydraulic drive circuit for driving the relative movement of each pipe fitting through a piston is further configured at the control handle 2. Installing the hydraulic drive circuit on the control handle 2 can avoid using long external pipelines and reduce component interference during handheld mobile operations.

[0391] In an embodiment, the hydraulic drive circuit includes:

[0392] A hydraulic pipeline for providing a liquid channel communicating with each hydraulic cavity;

[0393] A drive pump 5 connected to the hydraulic pipeline for driving the liquid to flow;

[0394] Control valve, connected to a hydraulic pipeline to control the flow direction of the liquid.

[0395] The hydraulic pipeline generally refers to the pipeline used to connect each component in the hydraulic drive circuit. Since the hydraulic drive circuit is configured inside the control handle 2, it is preferably that all or most of the hydraulic pipelines are accommodated inside the control handle 2. In the attached drawings related to the specific structure in this application, the hydraulic pipelines are omitted. Since the connection relationship of each component has been clearly described, the hydraulic pipelines can be arranged as needed during implementation. Since the hydraulic pipelines generally use hoses, how to accommodate them inside the control handle 2 can be implemented as required.

[0396] When in use, the hydraulic pipeline is filled with liquid, and the reciprocating movement of the piston is changed by the flow direction of the liquid. To improve safety, the liquid in the hydraulic drive circuit is physiological saline.

[0397] By arranging corresponding control valves in the hydraulic drive circuit, the flow direction of the liquid can be controlled, the movement direction of the piston can be changed, or other auxiliary functions can be realized. For example, the control valve can include check valves respectively arranged at the outlet and inlet of the drive pump 5, and a multi-way switching valve 6 for switching the movement direction of the piston.

[0398] See Figures 9a - 9c , in order to buffer and temporarily store the liquid, in one embodiment, the hydraulic drive circuit further includes a liquid storage tank 7 connected to the hydraulic pipeline for temporarily storing the liquid. The liquid storage tank 7 can also be integrally installed inside the control handle 2. In order to pre-fill or fill the liquid on-site during use, the liquid storage tank 7 is provided with a liquid filling port 71.

[0399] The liquid storage tank 7 not only has outlets and inlets connected to the hydraulic pipeline, but also can be separately provided with a liquid filling port 71. A valve can be separately configured at the liquid filling port 71 to connect to an external liquid filling device. In addition, in a preferred embodiment, the liquid filling can also be realized by using the drive pump 5.

[0400] Combined with Figures 3a - 3e , in one embodiment, an interventional device delivery system is provided, including a plurality of pipe fittings 1 coaxially arranged from the inside to the outside, and a control handle 2 for driving the relative movement of the plurality of pipe fittings 1. The distal ends of each pipe fitting are used to cooperate with each other to operate the interventional device, and the proximal ends of each pipe fitting are connected to the control handle 2. A hydraulic drive circuit for driving the relative movement of each pipe fitting is also configured at the control handle 2;

[0401] The hydraulic drive circuit at least includes a liquid storage tank 7, and the liquid storage tank 7 includes:

[0402] A tank body 75, with a tank opening and an inlet 73 and an outlet 74 connected to the hydraulic drive circuit;

[0403] A buffer bladder 77, the buffer bladder 77 is placed inside the tank body 75 and is sealingly fitted with the tank opening;

[0404] The gland 76 is buckled with the tank body 75 and clamps and fixes the buffer bladder 77 with the tank mouth.

[0405] In the hydraulic drive circuit, in order to store liquid and act as a buffer for sudden changes in liquid flow pressure, a liquid storage tank 7 can be configured, where the tank body 75 is connected to the inlet side of the drive pump 5 in the hydraulic drive circuit. When the liquid volume inside the tank body 75 changes, the pressure can be released through the deformation of the buffer bladder 77.

[0406] In order to facilitate the replenishment of body fluid from the outside, in one embodiment, the bottom wall of the tank body 75 is on the side away from the tank mouth, and a liquid injection port 71 is provided on the bottom wall, and a pipeline joint is installed at the liquid injection port 71.

[0407] The pipeline joint can be provided with a connection structure such as a thread that is convenient for disassembly and assembly. The tank body 75 is installed inside the control handle 2, and only the pipeline joint is exposed to the control handle 2. In order to avoid interfering with the deformation of the buffer bladder 77, both the inlet 73 and the outlet 74 of the tank body 75 are adjacent to the bottom wall.

[0408] The tank body 75 includes a first tank body 75a and a second tank body 75b that are interconnected, and a buffer bladder 77 is provided inside the first tank body 75a.

[0409] The volume of the first tank body 75a is larger than that of the second tank body 75b. The top of the first tank body 75a has a tank mouth, and the bottom shape of the first tank body 75a converges and transitions to the second tank body 75b.

[0410] The relatively large volume of the first tank body 75a facilitates the configuration of a buffer bladder 77 with a corresponding volume, improving the buffer adaptation ability. The bottom shape of the first tank body 75a converges to form a stepped structure, and the bottom of the buffer bladder 77 can abut against the stepped structure when expanded to the maximum volume, playing an auxiliary phase role and avoiding overly occupying the space of the second tank body 75b.

[0411] The buffer bladder 77 is made of an elastic material and changes the internal volume of the tank body 75 through its own deformation. As a preferred embodiment, the bladder wall of the buffer bladder 77 is provided with a corrugated structure that can be stretched and deformed. The stretching or compression of the corrugated structure can guide the volume change trend of the buffer bladder 77 and further increase the variable volume range.

[0412] In order to avoid the obstruction of the increase in internal pressure when the volume of the buffer bladder 77 decreases, in one embodiment, the side of the buffer bladder 77 facing the tank mouth is an open structure, and the opening part is provided with an outward turning edge 771, which is clamped and fixed by the gland 76 and the tank mouth. When the volume of the buffer bladder 77 decreases, the internal air can be discharged from the opening part, making the corrugated structure flat and folded.

[0413] In one embodiment, to ensure the sealing effect, the turned-out edge 771 has an annular protrusion 772 that abuts against the gland 76. The annular protrusion 772 can be regarded as a thickened area and has a larger deformation range. When the gland 76 abuts against the annular protrusion 772, the deformation of the annular protrusion 772 can compensate for local shape defects or machining errors to ensure the sealing performance. Of course, a groove can be formed in the corresponding part of the gland 76 to accommodate the annular protrusion 772, which is more convenient for positioning and assembly, and the groove depth is slightly smaller than the annular protrusion 772.

[0414] A closed space for storing liquid has been formed between the buffer bladder 77 and the tank body 75. Therefore, the main function of the gland 76 is to fix the buffer bladder 77. In one embodiment, the gland 76 includes:

[0415] An annular frame that clamps and fixes the buffer bladder 77 with the tank opening;

[0416] An elastic hook 761 that extends from the annular frame to the side of the tank body 75 and cooperates with the tank body 75.

[0417] To cooperate with the annular frame, the tank opening is turned outwards to form an interface platform 751. The annular frame clamps and fixes the buffer bladder 77 with the top surface of the interface platform 751, and the elastic hook 761 abuts against the bottom surface of the interface platform.

[0418] The annular frame and the interface platform 751 are roughly matched in shape. The elastic hooks 761 are generally arranged in pairs to maintain balanced force application. The elastic hooks 761 have guiding inclined surfaces that act on the interface platform 751 to facilitate positioning during installation. To ensure the sealing effect, a flange 752 that abuts against the buffer bladder 77 is annularly arranged on the top surface of the interface platform 751.

[0419] See Figure 10 , in one embodiment, the driving pump 5 includes:

[0420] A pump housing 51 fixed to the control handle and connected to the hydraulic drive circuit;

[0421] A working member 52 movably installed in the pump housing 51 for driving the liquid to flow;

[0422] A driving member 53 movably installed on the control handle and linked with the working member 52;

[0423] A return spring 56 acting between the control handle and the driving member 53.

[0424] The inside of the pump housing 51 is used to form a pump chamber 57. The pump housing 51 is provided with an inlet 54 and an outlet 55 that communicate with the pump chamber 57, and the inlet 54 and the outlet 55 are connected to the hydraulic drive circuit.

[0425] The control handle can also be installed with a spare connector 72 for temporarily transferring liquid or replacing other components.

[0426] The working part 52 makes a linear reciprocating motion or a circular motion within the pump housing 51 to drive the liquid to flow. The common form can adopt the form of an impeller or a plunger. In one embodiment, the working part 52 is a plunger, and the driving part 53 directly presses against the plunger or is linked with the plunger through a transmission mechanism.

[0427] The driving part 53 is an electric part, a pneumatic part or a manual part. The function of the driving part 53 is to drive the working part 52 to move. The driving part 53 and the working part 52 can be of an integral structure or a split linkage. According to the different forms of the power source, in order to simplify the structure, a manual part is preferably adopted, that is, the working part 52 is driven by manual operation. Of course, the basic functions can also be achieved by using electricity or pneumatic power.

[0428] In one embodiment, the manual part is an operating button that is slidably or rotatably mounted on the control handle.

[0429] In one embodiment, the driving part 53 has a shaft hole 531 and is mounted on the control handle through a rotating shaft. The control handle includes a working part for providing a hydraulic cavity and a holding part 22 connected to the working part. The operating button is mounted on the holding part 22. So as to facilitate one-handed operation of the driving pump 5 while holding.

[0430] In one embodiment, the driving pump 5 further includes a reset part acting between the operating button and the control handle. The driving part 53 and the working part 52 can be in abutting cooperation, or can be connected through a limiting structure or a traction part, so that the working part 52 reciprocates simultaneously when the driving part 53 is reset. A reset part can be arranged between the driving part 53 and the control handle, such as a compression spring or a tension spring acting on the driving part 53, or a torsion spring mounted on the rotating shaft part, such as a reset spring 56. In order to make the working part 52 reciprocate, the reset part can also directly act on the working part 52, such as a compression spring located in the pump chamber 57 and directly abutting against the working part 52. When in use, the driving part 53 is repeatedly pressed, and then the working part 52 is driven to make the liquid flow in the hydraulic drive circuit.

[0431] See Figures 11a - 1 1f, Figures 12a - 12d , in one embodiment, the control valve adopts a multi-way switching valve 6. The multi-way switching valve 6 has a driving side interface 67 connected to the outlet and inlet of the driving pump 5, and a plurality of working side interfaces 68. Each two working side interfaces are connected to one hydraulic cavity. The multi-way switching valve 6 has a plurality of gears and is used to switch the connection relationship between the driving side interface and different working side interfaces to control the liquid flow direction.

[0432] The multi-way switching valve 6 can switch the connection relationship between each hydraulic cavity and the outlet and inlet of the driving pump 5 through different gears, that is, the change of the piston movement direction can be realized. One-way valves can be configured as needed to avoid unnecessary backflow of the liquid at the driving pump 5 and ensure the liquid delivery efficiency.

[0433] The drive-side interface and the working-side interface are only distinguished by different connecting components. For the multi-way switching valve 6 itself, they are just multiple different interfaces.

[0434] In one embodiment, the multi-way switching valve 6 includes a valve seat 61 and a valve core 62 that cooperate with each other. The valve seat 61 has a valve cavity inside, and a plurality of interfaces 65 are provided on the side wall of the valve cavity for connecting the drive pump and each hydraulic cavity. The valve core 62 is placed in the valve cavity and is rotationally fitted. A plurality of flow channels 66 are provided on the outer peripheral wall of the valve core 62. When the valve core 62 rotates to different positions, there are corresponding connection relationships between the plurality of flow channels 66 and the plurality of interfaces 65. For the sake of easy identification, in one embodiment, the multi-way switching valve 6 is embedded in the control handle 2, and a mark 64 indicating the gear position of the multi-way switching valve 6 is provided on the control handle 2.

[0435] The valve core 62 is connected to a wrench 63. When the wrench rotates to different angles, it points to the marks 64 of different gears. In this embodiment, for the sake of matching the functions of different gears, seven flow channels 66 (indicated by the arrows in the figure) are provided. Of course, the number of flow channels 66 can also be increased or decreased accordingly according to the functions to be achieved.

[0436] In one embodiment, the control valve further includes:

[0437] Two one-way valves. The outlet of the drive pump 5 is connected to the liquid storage tank 7 through the first one-way valve; the drive-side interface of the multi-way switching valve is connected to the inlet of the drive pump 5 through the second one-way valve.

[0438] To further indicate the operation, the multi-way switching valve 6 is embedded in the control handle 2, and a mark indicating the gear position of the multi-way switching valve 6 is provided on the control handle 2.

[0439] See Figure 3a , Figure 3b , although the shape of the control handle 2 is not strictly limited, for the sake of easy operation, in some embodiments, the control handle 2 includes a working part 21 and a holding part 22 connected to the working part 21. The cylinder barrel 3 is located inside the working part 21, that is, the working part 21 is used as a whole to provide a hydraulic cavity. The working part 21 also has a relative distal end 211 and a proximal end 212, and their relative orientations are expressed similarly to other components.

[0440] The shape of the holding part 22 is convenient for holding and operating. For example, it has a length direction as a whole. Since the cylinder barrel is installed in the working part 21, taking the movement direction of the piston in the cylinder barrel as the axial direction of the cylinder barrel, the length direction of the holding part 22 is substantially perpendicular to the axial direction of the cylinder barrel, or slightly obliquely intersects. As for the two parts of the working part 21 and the holding part 22, they are generally in an L shape or a T shape as a whole. In order to further improve the holding feel and conform to the shape characteristics of the hand, the overall shape of the control handle 2 is similar to the shape of a pistol. In the hydraulic drive circuit, some control components that need to be operated in real time, such as switches, etc., can be arranged on the holding part 22 for easy single-handed operation.

[0441] For the convenience of single-handed operation, in an embodiment of the present application, an interventional device delivery system is provided, which includes a plurality of pipe fittings coaxially arranged from the inside to the outside, and a control handle 2 for driving the relative movement of the plurality of pipe fittings. The distal ends of the pipe fittings are used to cooperate with each other to operate the interventional device, and the proximal ends of the pipe fittings are connected to the control handle 2. A hydraulic drive circuit for driving the relative movement of the pipe fittings is configured at the control handle 2. The hydraulic drive circuit at least includes a drive pump 5 for driving the flow of liquid, and a control valve for controlling the flow direction of the liquid;

[0442] The control handle 2 is provided with a holding portion 22. The operating member of the drive pump 5 is arranged at the holding portion 22, and the operating member of the control valve is adjacent to the holding portion 22.

[0443] In order to make the hydraulic drive circuit work, a relatively simple and direct method is to use manual operation. During the operation process, the components that generally need to be frequently operated are the drive pump 5 and the control valve. The operating members of both are arranged at the holding portion 22 or adjacent to the holding portion 22, which is convenient for single-handed holding and corresponding operations at the same time, and convenient for the other hand to operate or support other devices.

[0444] See Figure 3a , Figure 3b , Figures 12a - 12e , in an embodiment, the control valve adopts a multi-way switching valve 6. The interventional device delivery system in this embodiment includes a plurality of pipe fittings coaxially arranged from the inside to the outside, and a control handle 2 for driving the relative movement of the plurality of pipe fittings. The distal ends of the pipe fittings are used to cooperate with each other to operate the interventional device, and the proximal ends of the pipe fittings are connected to the control handle 2. A hydraulic drive circuit for driving the relative movement of the pipe fittings is further configured at the control handle 2. The hydraulic drive circuit includes a multi-way switching valve 6 for switching the liquid flow direction. The multi-way switching valve 6 includes:

[0445] Two relatively arranged valve seats, one of the valve seats is provided with an interface 67 for accessing the driving side of the hydraulic drive circuit, and the other valve seat is provided with an interface 68 for accessing the working side of the hydraulic drive circuit;

[0446] A valve core 62 that is sealed and fastened by the two valve seats and rotatably installed. The valve core 62 is provided with a communication hole 624. When the valve core 62 rotates to different angles, the communication hole 624 connects the corresponding driving side interface 67 and working side interface 68;

[0447] A wrench 63 linked to the valve core 62 for changing the rotation angle of the valve core 62.

[0448] See Figure 3a , Figure 3b , Figures 12a - 12e, To make single-handed operation and mode switching (i.e., gear shifting) more convenient, one embodiment provides an interventional device delivery system, which includes multiple pipe fittings coaxially arranged from inside to outside, and a control handle 2 for driving the relative movement of the multiple pipe fittings. The distal ends of the pipe fittings are used to cooperate with each other to operate the interventional device, and the proximal ends of the pipe fittings are connected to the control handle 2. A hydraulic drive circuit for driving the relative movement of the pipe fittings is also configured at the control handle 2; the hydraulic drive circuit includes a multi-way switching valve 6 for switching the liquid flow direction. The multi-way switching valve 6 includes:

[0449] Two relatively arranged valve seats. One valve seat is provided with a drive-side interface 67 connected to the hydraulic drive circuit, and the other valve seat is provided with a working-side interface 68 connected to the hydraulic drive circuit;

[0450] A valve core 62 that is sealed and fastened by the two valve seats and rotatably installed. The valve core 62 is provided with a communication hole 624. When the valve core 62 rotates to different angles, the communication hole 624 connects the corresponding drive-side interface 67 and working-side interface 68;

[0451] A wrench 63 that is linked to the valve core 62 through a one-way clutch mechanism to change the rotation angle of the valve core 62;

[0452] A wrench return member 69 acting between the wrench 63 and at least one valve seat.

[0453] In this embodiment, the wrench 63 and the valve core 62 are driven by a one-way clutch mechanism, that is, the switching of each gear is achieved by the one-way rotation of the valve core 62, rather than the reciprocating two-way rotation. It is more convenient for a single finger to pull the wrench, which conforms to the physiological structure characteristics of the operator's finger. In the hydraulic drive circuit, the power for the liquid flow can adopt the existing technology or be combined with the drive pump 5 in other embodiments.

[0454] Combined Figures 3a - 3e , In one embodiment, the control handle 2 includes a working portion 21 and a holding portion 22 connected to the working portion 21. A cylinder 3 with a piston inside is configured in the working portion 21. Multiple pipe fittings penetrate into the cylinder 3 and are connected to the piston or fixed relative to the cylinder 3. The relative movement of the pipe fittings is driven hydraulically inside the cylinder 3;

[0455] The cylinder 3 is respectively connected to the corresponding working-side interfaces 68 on both sides of the piston. The hydraulic drive circuit further includes a drive pump 5 connected to each drive-side interface 67 for driving the liquid to flow.

[0456] In one embodiment, the cylinder 3 includes a first cylinder 31 and a second cylinder 32 axially butted in sequence. A first piston 4 is slidably installed in the first cylinder 31, and a second piston 9 is slidably installed in the second cylinder 32. The pipe fittings include a first pipe fitting 11, an intermediate pipe fitting 13, and a second pipe fitting 12 coaxially arranged from inside to outside;

[0457] All pipe fittings enter from the distal end of the first cylinder barrel 31. Among them, the first pipe fitting 11 is fixed to the first piston 4. After the middle pipe fitting 13 extends out of the first piston 4, it enters the second cylinder barrel 32 via the isolation seal 34 and is fixed to the second piston 9. After the first pipe fitting 11 extends out of the second piston 9, it is fixed to the proximal end of the second cylinder barrel 32.

[0458] Combined Figure 10 , in one embodiment, the driving pump 5 includes:

[0459] A pump housing 51 fixed within the control handle 2 and connected to the hydraulic drive circuit;

[0460] A working member 52 movably installed within the pump housing 51 for driving the flow of liquid;

[0461] A driving member 53 movably installed on the holding portion 22 and linked to the working member 52;

[0462] A return spring 56 acting between the control handle 2 and the driving member 53.

[0463] The outlet 55 and the inlet 54 of the driving pump 5 are both opened on the pump housing 51. The driving side interfaces 67 of the multi-way switching valve 6 have two, which are respectively connected to the outlet 55 and the inlet 54 of the driving pump 5. It is also possible to configure necessary check valves and a liquid storage tank 7 connected between the inlet 54 and the corresponding driving side interface 67 in combination with the foregoing related embodiments.

[0464] The positional relationship among the wrench 63, the holding portion 22, and the working portion 21 also has a certain impact on the convenience of operation. In one embodiment, the wrench 63 and the holding portion 22 are on the same side in the radial direction of the working portion 21. Generally, when operating, the wrench 63 and the holding portion 22 are closer to the operator, while the working portion is relatively farther from the operator.

[0465] In a preferred embodiment, the wrench 63 is located on the proximal side of the holding portion 22, and the driving member 53 faces the wrench 63. When operating, it can be in a way similar to that of a pistol. The index finger pulls the wrench 63, and the other four fingers grip the holding portion 22 and can simultaneously press the driving member 53 to drive the driving pump 5. When shifting gears, just pull the wrench 63. The holding of the control handle 2 and the control of the hydraulic drive circuit can be completed with one hand, greatly liberating human labor and eliminating the inconvenience of multi-person cooperation operation.

[0466] To prevent slipping during holding, an anti-slip blocking member 28 is also provided at the end of the holding portion 22 (i.e., the end far from the working portion 21). The anti-slip blocking member 28 can extend distally and span to other parts of the housing of the control handle 2. The anti-slip blocking member 28 is strip-shaped and extends along a smooth curve, which can further improve the hand feeling.

[0467] In one embodiment, to cooperate with the operation of the wrench 63 and improve the stability of holding, the anti - detachment blocking member 28 surrounds the wrench 63. That is, the wrench 63 is in a closed area.

[0468] The valve core 62 and the wrench 63 can be separately linked or integrally structured. The end of the wrench 63 is in a hook shape for easy hooking operation.

[0469] Figures 12a - 12e In related embodiments, the multi - way switching valve 6 has multiple gears and is used to switch the communication relationship between the driving - side interface 67 and different working - side interfaces 68 to control the liquid flow direction. The valve seat 61 is formed by two parts buckling, and the valve core 62 rotates between them. When rotated to different angles, different gears are corresponding. Other details or improvements of the multi - way switching valve 6 will be further described below.

[0470] Since the valve core 62 and the valve seat 61 are rotationally matched, it is necessary to ensure sealing between them. When there is sufficient machining accuracy, they can be closely abutted against each other, but undoubtedly, relatively strict requirements are imposed on materials and processes. To reduce the process requirements and facilitate machining, in one embodiment, each valve seat is provided with an installation groove on the side facing the valve core 62. A sealing gasket is fixedly embedded in the installation groove and is sealed against the valve core 62 through the sealing gasket.

[0471] In one embodiment, the positioning method of the sealing gasket is as follows: there are mutually engaged positioning teeth between the inner peripheral edge of the installation groove and the outer peripheral edge of the sealing gasket. Of course, other fixing methods can also be used for positioning. In this embodiment, the method of using positioning teeth eliminates other positioning components and does not require glue bonding. During assembly, the sealing gasket can be aligned and pressed into the installation groove, which is convenient for operation.

[0472] The mutually engaged positioning teeth can prevent the sealing gasket from rotating with the valve core 62. For example, the inner peripheral edge of the installation groove of the first valve seat 61a in the figure is provided with a second positioning tooth 614, and the outer peripheral edge of the first sealing gasket 611 in the installation groove is provided with a first positioning tooth 6111 that meshes with the second positioning tooth 614. Similarly, the inner peripheral edge of the installation groove of the second valve seat 61b in the figure is provided with a third positioning tooth 615, and the outer peripheral edge of the second sealing gasket 617 in the installation groove is provided with a fourth positioning tooth 6171 that meshes with the third positioning tooth 615.

[0473] The sealing gasket can be made of elastic materials such as rubber to facilitate maintaining necessary sealing. In addition, the valve seat or other parts can also be made of transparent materials to facilitate observing and verifying the in - place situation during assembly, as well as visual inspection during use.

[0474] Among the two valve seats, one valve seat is the first valve seat 61a provided with the driving - side interface 67, and the other valve seat is the second valve seat 61b provided with the working - side interface 68;

[0475] On the side of the first valve seat 61a facing the valve core, a liquid inlet hole 613 communicating with the driving side interface 67 is provided, and a first liquid passing hole 6112 corresponding to the position of the liquid inlet hole 613 and communicating with each other is provided on the first sealing gasket 611 embedded in the first valve seat 61a;

[0476] On the side of the second valve seat 61b facing the valve core, a liquid outlet hole 616 communicating with the working side interface 68 is provided, and a second liquid passing hole 6172 corresponding to the position of the liquid outlet hole 616 and communicating with each other is provided on the second sealing gasket 617 embedded in the second valve seat 61b;

[0477] When the valve core rotates to different angles, the communication holes 624 on the valve core will connect the corresponding first liquid passing holes 6112 and second liquid passing holes 6172.

[0478] There are two driving side interfaces 67 on the first valve seat 61a, which are respectively connected to the outlet and inlet of the driving pump 5. Correspondingly, there are also two liquid inlet holes 613 and communication holes 624 configured in a one-to-one correspondence. A cap 618 can also be provided on the side of the first valve seat 61a facing away from the other valve seat.

[0479] The working side interfaces 68 on the second valve seat 61b are configured according to the number of gears. For example, in the relevant drawings of this embodiment, there are four working side interfaces 68, and there are also four liquid outlet holes 616 configured in a one-to-one correspondence. In order to facilitate gear shifting, there are multiple second liquid passing holes 6172 on the second sealing gasket 617. For example, there are eight in this embodiment. Every two second liquid passing holes 6172 communicate with one of the liquid outlet holes 616. When the valve core 62 rotates to different angles, the two communication holes 624 correspond to two second liquid passing holes 6172 at the corresponding positions, and the two second liquid passing holes 6172 at this position are just connected to the corresponding two liquid outlet holes 616. In order to adapt to the distribution of the second liquid passing holes 6172, each liquid outlet hole 616 extends into a strip shape, that is, the same liquid outlet hole 616 can communicate with multiple second liquid passing holes 6172 to ensure the position change of the two communication holes 624 on the premise that the position of the second sealing gasket 617 remains unchanged.

[0480] There are two liquid inlet holes 613, and relative to the rotation axis of the valve core, each liquid inlet hole 613 is at a different radial position; the first liquid passing hole 6112 matches the position of the corresponding liquid inlet hole 613;

[0481] On the side of the valve core 62 facing the first valve seat 61a, two inner and outer annular grooves 623 are provided, and each annular groove 623 communicates with one of the liquid inlet holes 613, and the communication holes 624 are two and communicate with one of the annular grooves 623 respectively.

[0482] No matter what angle the valve core 62 rotates to, the two inner and outer annular grooves 623 can ensure communication with the liquid inlet holes 613 corresponding to the radial positions.

[0483] The valve core 62 is rotatably installed between two valve seats through a rotating shaft 621. The valve core 62 and the wrench 63 are linked through a one-way clutch mechanism, that is, the wrench 63 can only drive the valve core 62 to rotate in one direction (circumferentially). After the wrench 63 moves in place, the wrench return member 69 drives the wrench 63 to return, while the valve core 62 remains stationary. Repeating this process can drive the valve core 62 to switch to each gear.

[0484] In one embodiment, the wrench 63 includes an annular sleeve 631 located on the outer periphery of the valve core 62, and a hook portion 633 fixed to the annular sleeve 631 and extending outside the control handle 2; the inner edge of the annular sleeve 631 and the outer periphery of the valve core 62 are linked through a mutually cooperating one-way clutch mechanism.

[0485] The hook portion 633 is used for finger-pulling operation, preferably in a hook shape and located on the proximal side of the holding portion 22. There are positioning posts inserted into each other between the two valve seats and fixed by fasteners. In order to limit the extreme angle of rotation of the wrench 63 each time, a corresponding blocking member can be provided on the valve seat 61, or a limiting strip hole is enclosed between the two valve seats, and the hook portion 633 moves in the limiting strip hole, and the length of the limiting strip hole limits the movement stroke of the hook portion 633.

[0486] The one-way clutch mechanism includes:

[0487] Spur teeth 622 distributed around the outer periphery of the valve core 62;

[0488] Elastic claws 632 fixed to the inner circumference of the annular sleeve 631;

[0489] The wrench 63 has relative forward and reverse directions with respect to the rotation direction of the valve core 62. When rotating forward, the elastic claws 632 engage with the spur teeth 622 to drive the valve core 62. When rotating in reverse, the elastic claws 632 deform and slip off from the spur teeth 622, and the wrench return member 69 drives the wrench 63 to rotate in reverse.

[0490] The tooth surface of the spur teeth 622 has a specific orientation. One side can engage and link with the elastic claws 632, and the other side can cause the elastic claws 632 to slip off. The elastic claws 632 extend substantially circumferentially, allowing the elastic claws 632 to radially retract under the pressure of the spur teeth 622 and then slip off when the valve core reverses. After that, they expand radially and return under their own elasticity. At this time, if the valve core 62 rotates forward, it will engage with the previously slipped spur teeth 622 again and link up.

[0491] In order to better cooperate with the spur teeth 622, in one embodiment, the elastic claws 632 extend along the circumference of the annular sleeve 631 and bend inward. 2 to 4 elastic claws 632 are evenly distributed at intervals along the circumference of the annular sleeve 631.

[0492] The wrench reset member 69 is a coil spring extending around the valve core axis, one end of the coil spring is connected to the valve seat 61 , and the other end is connected to the annular sleeve 631 .

[0493] When the wrench 63 drives the valve core 62 to rotate forward, the elastic force of the coil spring is overcome, causing the coil spring to store energy. When the wrench 63 is released, the coil spring drives the wrench to rotate in the opposite direction and reset. In order to balance the force, in one embodiment, the coil spring is two circles arranged side by side. In the axial direction of the valve core 62, each circle of the coil spring is respectively located on both sides of the annular sleeve 631, and one end of each circle of the coil spring has a positioning bend 692 inserted into the corresponding side valve seat, and the other ends of each circle of the coil spring are connected to each other to form a positioning cross bar 691. The outer periphery of the annular sleeve 631 is provided with a slot 634 for accommodating the positioning cross bar 691.

[0494] Correspondingly, each valve seat is provided with an insertion hole 619 for the positioning bend 692 to be inserted into.

[0495] In order to further stabilize the position of the coil spring before and after deformation, in one embodiment, in the axial direction of the valve core, the outer periphery of the valve core 62 includes three sections, the ratchet 622 is fixedly distributed in the middle section, and the smooth sections 625 are on both sides, and the two coil springs are respectively mounted on the smooth sections 625 on the corresponding sides.

[0496] See also Figures 13a - 13b In one embodiment of the interventional instrument delivery system of the present application, two cylinders are used, namely a first cylinder 31 and a second cylinder 32. A first piston 4 is installed in the first cylinder 31, and the first cylinder 31 has a connecting port 314 and a connecting port 315; a second piston 9 is installed in the second cylinder 32, and the second cylinder 32 has a connecting port 324 and a connecting port 325.

[0497] The pipe fitting that moves axially relative to each other includes a second pipe fitting fixedly connected to the first piston 4, an intermediate pipe fitting fixedly connected to the second piston 9, and a first pipe fitting fixedly connected to the control handle. In addition, the control handle is connected to a protective tube located on the outer periphery of the second pipe fitting through a fixed sleeve 8, and the fixed sleeve 8 connected to the protective tube has an exhaust hole 82.

[0498] The hydraulic drive circuit is also provided with a multi-way switching valve 6, a drive pump 5 with an inlet 54 and an outlet 55, and a liquid storage tank 7 with an inlet 73 and an outlet 74. A first non-return valve 331 is connected to the inlet 54 of the drive pump 5; a second non-return valve 332 is connected to the outlet 55 of the drive pump 5. Each component is connected through a corresponding hydraulic pipeline 33.

[0499] In this embodiment, the multi-way switching valve 6 has a total of seven interfaces, two of which are drive-side interfaces 67, respectively connected to the outlet and inlet of the drive pump 5 (indirectly connected through a one-way valve and a liquid storage tank). The other five of the multi-way switching valve 6 are working-side interfaces 68, two of which are connected to the two communication ports of the first cylinder barrel 31, two are connected to the two communication ports of the second cylinder barrel 32, and one is connected to the exhaust hole 82.

[0500] If a separate exhaust pipe is configured, a multi-way switching valve with six interfaces can also be used, that is, two are drive-side interfaces 67, respectively connected to the outlet and inlet of the drive pump 5 (indirectly connected through a one-way valve and a liquid storage tank). The other four of the multi-way switching valve are working-side interfaces 68, two of which are connected to the two communication ports of the first cylinder barrel 31, and two are connected to the two communication ports of the second cylinder barrel 32.

[0501] Inside the multi-way switching valve 6, corresponding drive-side interfaces 67 and working-side interfaces 68 can be connected through multiple flow channels 66 on the valve core. Taking the multi-way switching valve 6 with a total of seven interfaces as an example, it can be divided into five gears D1 - D5 based on different connection relationships, and each gear realizes different functions.

[0502] Specifically, the functions of each gear are as follows:

[0503]

[0504] Taking the multi-way switching valve 6 with a total of six interfaces as an example, two of which are drive-side interfaces 67, respectively connected to the outlet and inlet of the drive pump 5 (indirectly connected through a one-way valve and a liquid storage tank). The other four of the multi-way switching valve 6 are working-side interfaces 68, two of which are connected to the two communication ports of the first cylinder barrel 31, and two are connected to the two communication ports of the second cylinder barrel 32. Based on different connection relationships, it can be divided into four gears D1 - D4 in the above table, and each gear realizes different functions. Regarding exhaust, a separate exhaust pipe is configured, and the exhaust hole 82 is connected to a joint through a pipe. This joint can be embedded in the housing of the control handle to facilitate cooperation with external pipes, and exhaust is carried out by adding physiological saline.

[0505] See Figures 14a - 17 , in the following some embodiments, an intervention device release control mechanism is provided, that is, each pipe fitting that slides and nests with each other cooperates to release or recover the intervention device at the distal end. Regarding the control method of the proximal end of each pipe fitting, it can be combined with the control handle of the foregoing embodiments, or a control handle structure of conventional mechanical transmission or electric transmission can be used. Of course, when using the foregoing hydraulic drive control handle, the liquid pressure can be detected through an induction device, and then corresponding to the force application situation or the relative stroke of the pipe fittings at the distal end, which is more convenient for fine operation and also provides the necessary hardware basis for the full-automatic mode or combined with closed-loop control.

[0506] In one embodiment, an interventional device release control mechanism is provided, which includes a first pipe fitting 11, an intermediate pipe fitting 13, and a second pipe fitting 12 that are slidably nested with each other from the inside out. The distal end of the first pipe fitting 11 extends out of the intermediate pipe fitting 13, and a mounting head 112 for connecting the interventional device is provided at the extended part. A flexible control member is connected to the intermediate pipe fitting 13, and the control member has:

[0507] A holding state, in which the control member penetrates through the mounting head 112 and binds the interventional device to the mounting head 112;

[0508] An open state, allowing the interventional device to completely disengage from the mounting head 112;

[0509] The intermediate pipe fitting 13 is provided with a locking member 162 that cooperates with the control member. The locking member 162 is slidably fitted relative to the intermediate pipe fitting 13 and switches different states of the control member when sliding.

[0510] The holding state is understood that the locking member is still in the locked state. For example, inserted into the lock hole, the control member binds the interventional device to the mounting head. It is not strictly required that the interventional device contacts the mounting head, but it should be understood that under the traction of the control member, the interventional device cannot completely disengage from the mounting head. Of course, if the interventional device abuts against the mounting head or there is interference in space, it is more conducive to the positioning of the interventional device. The release of the interventional device is a gradual process, but as long as the locking member is still in the locked state, even if there is some loosening or even mutual separation between the interventional device and the mounting head, for the control member, it is still in the holding state, that is, the interventional device cannot completely disengage from the mounting head and be released.

[0511] Correspondingly, the open state of the control member is understood as the unlocking of the locking member. For example, disengaging from the lock hole. At this time, the control member can disengage from the locking member, which also means that the interventional device and the control member can be separated from each other. In actual operation, the control member needs to be retracted proximally after the interventional device is released and positioned. Therefore, before or at the initial stage of the retraction, there is still contact or entanglement between the control member and the interventional device. However, since the locking member has been unlocked, what is emphasized here is a state that allows the interventional device and the control member to be separated from each other, rather than emphasizing that they are far away from each other in space and have no contact. Since the restraint of the control member is lost, of course, it also allows the interventional device to completely disengage from the mounting head.

[0512] In the figure, the first pipe fitting 11 is fixed by inserting the two ends into each other, that is, it includes a distal section 11a and a proximal section 11b. One end of the distal section 11a is provided with a guiding head 111, and the other end is inserted into the proximal section 11b. The mounting head 112 is located at the end of the proximal section 11b. Each section of the first pipe fitting 11 and the mounting head 112 can be fixed to each other by welding or other means.

[0513] Taking the stent 10 as an example of the interventional device, the proximal side generally has connecting ears 101. The connecting ears are provided with connecting holes or hooks for connecting with the control member. The control member is made of flexible material, facilitating operations such as bending, winding, and knotting.

[0514] In one embodiment, the control member is a ligation thread 18. The proximal end of the interventional device has a plurality of connecting ears 101. In the holding state, the ligation thread 18 directly passes through and pulls each connecting ear 101.

[0515] Or an annular wire sleeve 19 is disposed through between the connecting ears 101. In the holding state, the ligation thread 18 bypasses the annular wire sleeve 19 and indirectly pulls the connecting ear 101 through the annular wire sleeve 19.

[0516] After the interventional device is released, the annular wire sleeve 19 can be retained on the interventional device and does not withdraw with the ligation thread 18. Compared with the ligation thread 18 directly pulling the connecting ear by itself, the annular wire sleeve 19 can be pre-assembled on the interventional device, and it is more convenient to wind with the ligation thread 18 on-site during use, optimizing the stroke of the relatively moving pipe fittings.

[0517] The ligation thread 18 is used to bind and pull the connecting ear, thereby controlling the release process to prevent the stent 10 from suddenly expanding radially and injuring the internal tissues. The ligation thread 18 can be selected from the commonly used materials and strengths in the interventional field and can be directly or indirectly connected to the connecting ear 101.

[0518] Tightening the ligation thread 18 proximally can cause the connecting ear 101 to converge towards the distal side of the mounting head 112. As long as the ligation thread 18 is maintained in the holding state, the release of the stent 10 can be restricted. Of course, the release and recovery of the stent 10 are opposite processes, and the dynamic cooperation between the components is the same.

[0519] In order to reasonably distribute the force application positions when pulling the stent 10, multiple ligation threads 18 can be used, and the pulling positions of each ligation thread 18 and the annular wire sleeve 19 are evenly distributed along the circumference of the interventional device.

[0520] When the ligation thread 18 directly pulls the connecting ear 101, the number of ligation threads 18 should not be too many, otherwise it may affect the compressed size and loading. For example, it is slightly less than the number of connecting ears 101, so that the connecting ears 101 can be divided into multiple groups, and each group corresponds to one ligation thread 18.

[0521] The locking member 162 is installed on the intermediate pipe fitting 13. The function of the locking member 162 is to at least limit one end of the ligation thread 18. For example, one end of the ligation thread 18 never detaches from the intermediate pipe fitting, and the other end is connected to the locking member 162 after passing around the connecting ear 101. In this way, a restraint on the stent 10 is formed. Once the locking member releases the ligation thread 18, this end no longer pulls the stent 10, allowing the stent 10 to expand and release until this end is finally withdrawn from the connecting ear 101.

[0522] The lashing wire 18 knots or winds around itself to form a wire loop, and the locking member 162 is inserted into the wire loop to form a restraint on the lashing wire 18. When the locking member moves, the wire loop can be withdrawn, that is, the corresponding intervention instrument can be completely disengaged from the mounting head 112.

[0523] When the locking member 162 slides relative to the intermediate pipe fitting 13, corresponding driving means can be adopted. For example, a transmission member is provided at the proximal end, or when the intermediate pipe fitting 13 moves actively, the locking member 162 moves relatively. Or after the intermediate pipe fitting 13 carries the locking member 162 and moves to a preset position, only the locking member 162 is blocked, forming a relative movement with the intermediate pipe fitting 13. Of course, improved solutions are also provided in some of the following embodiments.

[0524] Configuring a transmission member alone may further complicate the structure of the control handle. To simplify the corresponding structure, in some embodiments, a solution is provided in which the locking member and the intermediate pipe fitting follow each other and the lashing wire 18 is released in a passive manner.

[0525] In one embodiment, an intervention instrument release control mechanism is provided, which includes a first pipe fitting 11, an intermediate pipe fitting 13, and a second pipe fitting 12 that are slidably nested and fitted with each other from the inside out. The distal end of the first pipe fitting 11 extends out of the intermediate pipe fitting 13, and a mounting head 112 for connecting an intervention instrument is provided at the extended part. A flexible control member is connected to the intermediate pipe fitting 13. The control member has a holding state that restrains the intervention instrument on the mounting head 112 and an open state that allows the intervention instrument to completely disengage from the mounting head 112;

[0526] A locking member 162 is movably mounted on the intermediate pipe fitting 13. The locking member 162 is configured to restrict the control member in the holding state. When the intermediate pipe fitting 13 moves relative to the first pipe fitting 11, the locking member 162 is triggered by the mounting head 112 and releases the control member into the open state.

[0527] In this embodiment, when the intermediate pipe fitting 13 moves relative to the first pipe fitting 11, the locking member 162 follows. Although it is movably mounted on the intermediate pipe fitting 13, a certain friction or other separation resistance can be maintained between them. Therefore, it can follow the intermediate pipe fitting 13. For example, in one embodiment, a fixed base 15 and a slidable movable seat 16 are mounted on the intermediate pipe fitting 13. The locking member 162 is fixed to the movable seat 16. In the holding state, the base 15 and the movable seat 16 are tightly fitted. When the intermediate pipe fitting 13 moves distally relative to the first pipe fitting 11, the movable seat 16 follows the base 15 in movement, and the locking member 162 is blocked, causing the base 15 and the movable seat 16 to move away from each other, that is, releasing the control member into the open state.

[0528] The way the locking member 162 is blocked can be direct abutment, or indirectly applying force through a transmission component to abut against the mounting head. Taking the indirect way as an example, an unlocking rod 163 is fixed on the movable seat 16. The proximal ends of the unlocking rod 163 and the locking member 162 can be connected by an annular portion 161. The three form the movable seat 16. The annular portion 161 can be slidably sleeved on the outer periphery of the intermediate pipe fitting 13. When the intermediate pipe fitting 13 moves distally relative to the first pipe fitting 11 until the unlocking rod 163 abuts against the mounting head 112. At this time, if the intermediate pipe fitting 13 is further pushed, the movable seat 16 overcomes the tight-fitting resistance between it and the base 15 and moves away from the base 15, releasing the lashing wire 18 by the locking member 162.

[0529] The tight-fitting manner between the base 15 and the movable seat 16 can be that the unlocking rod 163 penetrates the base 15 and is tightly fitted at the penetrating part, or at least one of the unlocking rod 163 and the locking member 162 abuts against the base under the traction of the lashing wire 18 and there is at least a frictional resistance that can follow each other.

[0530] When the intermediate pipe fitting 13 moves relative to the first pipe fitting 11, the movement direction of the intermediate pipe fitting 13 is from the proximal end to the distal end; when the locking member 162 is triggered and unlocked by the mounting head 112, the movement direction of the locking member 162 is from the distal end to the proximal end.

[0531] In this application, when the locking member 162 is unlocked, for the operator, it is to push the intermediate pipe fitting distally instead of directly pulling the locking member 162 proximally. During the process of pushing the intermediate pipe fitting distally, it is not immediately unlocked. When pushing the intermediate pipe fitting distally, the control member also moves along and maintains the restraint on the intervention instrument. Therefore, during the release process of the intervention instrument, the controllable stage is longer, which is convenient for emergency recovery at any time during the release process. On the contrary, if the locking member 162 is directly pulled proximally when unlocking, the control of the intervention instrument will be lost prematurely.

[0532] The base 15 can be provided with a lock hole 1522 that cooperates with the locking member 162. When the distal end of the locking member 162 is inserted into the lock hole 1522, since the lashing wire 18 is sleeved on the locking member 162, it is in a holding state. If it is withdrawn from the lock hole 1522, the lashing wire 18 is allowed to disengage from the locking member 162 and switch to an open state.

[0533] The control member restrains the intervention instrument to the mounting head 112, mainly restricting the radial full expansion of the intervention instrument and completely disengaging from the mounting head 112. Especially in the compressed state of the intervention instrument after loading, that is, it is wrapped in the second pipe fitting 12. All the connecting ears 101 abut against the distal side of the mounting head 112 under the traction of the control member. In order to guide each connecting ear into place and not be easily staggered with each other, further improvements are made to the mounting head 112 in the following some embodiments.

[0534] In one embodiment, an interventional device release control mechanism is provided, which includes a first pipe fitting 11, an intermediate pipe fitting 13, and a second pipe fitting 12 that are slidably nested and fitted with each other from the inside out. The distal end of the first pipe fitting 11 extends out of the intermediate pipe fitting 13, and a mounting head 112 for connecting an interventional device is provided at the extended part. A flexible control member is connected to the intermediate pipe fitting 13. The control member has a holding state that binds the interventional device to the mounting head 112 and an open state that allows the interventional device to completely disengage from the mounting head 112.

[0535] The intermediate pipe fitting 13 is located on the proximal side of the mounting head 112, and the interventional device is located on the distal side of the mounting head 112. A constriction guiding hole 1121 is formed in the mounting head 112. The constriction guiding hole 1121 is used for the control member to pass through and connect the interventional device, and the proximal side of the interventional device is restricted to the constriction guiding hole 1121 in the holding state.

[0536] On the one hand, the constriction guiding hole 1121 can guide and restrict the extending path of the control member. On the other hand, under the pulling of the control member, the connecting ears have a tendency to gather together and converge into the constriction guiding hole 1121, which is convenient for the loading of the interventional device and keeping it in a compressed state. Especially during recovery, its guiding effect is more prominent.

[0537] When the interventional device is released, the control member moves step by step towards the distal end, and the divergence and outward expansion of each connecting ear 101 are also gradual. By controlling the release speed of the control member, the bounce force caused by the sudden outward expansion of the connecting ear 101 can be prevented from stabbing the surrounding tissues in the body.

[0538] The control member extends from the intermediate pipe fitting 13 towards the distal end to connect the interventional device and then returns to the intermediate pipe fitting 13 towards the proximal end. In the holding state, the control member passes through and returns relative to the mounting head 112, and at least one of the forward and return paths passes through the constriction guiding hole 1121.

[0539] In a preferred embodiment, both the forward and return paths of the control member pass through the constriction guiding hole 1121. As much as possible, it is avoided to extend outside the periphery of the mounting head 112 to reduce interference with other components. In order to improve the constriction guiding effect, in a further preferred embodiment, the control member is one or more. For the same control member, the forward and return paths pass through the same constriction guiding hole 1121.

[0540] In order to facilitate assembly and have a regular outer peripheral shape, in one embodiment, the mounting head 112 is cylindrical and has an axial through hole, and the first pipe fitting 11 passes through the axial through hole. The mounting head 112 and the first pipe fitting 11 are fixed to each other by at least one of welding, bonding, interference fit, and auxiliary connecting members.

[0541] In other embodiments, the mounting head 112 can also be an annular member with a through hole in the middle, such as an annular sheet, etc.

[0542] In one embodiment, in order to reasonably distribute the traction force in the circumferential direction and enable the connecting lug to have an appropriate converging tendency, there are multiple converging guide holes 1121. The proximal side of the interventional device is provided with a connecting lug 101 for threading a control member. The connecting lugs 101 are divided into multiple groups. Before the interventional device is released, the connecting lugs in the same group converge to a corresponding converging guide hole 1121.

[0543] To match the grouping mode of the connecting lugs 101, the multiple converging guide holes 1121 are evenly distributed along the circumference of the mounting head 112.

[0544] Combined with the number of groups of the connecting lugs 101, the number of converging guide holes 1121 is 2 to 4. Too many groups or no grouping can make the distribution of stress points more uniform, but will lead to overly complex arrangements of the locking member and the control member, which is not conducive to compression loading. The converging guide holes 1121 extend along the axial direction of the first pipe fitting 11 and penetrate through the mounting head 112. To avoid interference and friction between the control member and other components (for example, reduce friction with the inner wall of the second pipe fitting 12), the converging guide holes 1121 extend inside the mounting head 112 and are only open at the axial two end faces of the mounting head 112, that is, not exposed to the outer circumference of the mounting head 112.

[0545] In a preferred embodiment, the opening part of the converging guide hole 1121 on the distal side is provided with a guiding flaring 1122. It is more convenient for the connecting lugs 101 in the same group to be positioned at the converging guide hole 1121 after converging.

[0546] In some embodiments, to further optimize the unlocking method of the locking member and make reasonable use of a limited number of pipe fittings, an interventional device release control mechanism is provided, which includes a first pipe fitting 11, an intermediate pipe fitting 13, and a second pipe fitting 12 that are slidably nested and fitted with each other from the inside out. The distal end of the first pipe fitting 11 extends out of the intermediate pipe fitting 13, and a mounting head 112 for connecting the interventional device is provided at the extended part. A flexible control member is connected to the intermediate pipe fitting 13. The control member has a holding state that binds the interventional device to the mounting head 112 and an open state that allows the interventional device to completely disengage from the mounting head 112;

[0547] A fixedly arranged base 15 and a slidably arranged movable seat 16 are mounted on the intermediate pipe fitting 13. A locking member 162 and an unlocking rod 163 are fixed on the movable seat 16. The unlocking rod 163 passes through the base 15, and one end extending out of the base 15 serves as a trigger end 1631. A lock hole 1522 for receiving the locking member 162 is provided on the base 15;

[0548] The control member is sleeved on the locking member 162 in the holding state, and the end of the locking member 162 is inserted into the locking hole 1522. When the intermediate pipe fitting 13 moves distally relative to the first pipe fitting 11, the triggering end 1631 of the unlocking rod 163 abuts against the mounting head 112 and drives the locking member 162 to move proximally out of the locking hole 1522, enabling the control member to enter the open state.

[0549] In the following embodiments, further improvements are also made to the specific structures or mating relationships of the components in the release control mechanism. For example, the movable seat 16 includes:

[0550] An annular portion 161, slidably sleeved on the intermediate pipe fitting 13 and located on the proximal side of the base 15;

[0551] A locking member 162, which is rod-shaped and extends distally from the annular portion 161;

[0552] An unlocking rod 163, which extends distally from the annular portion 161 and has an extension length greater than that of the locking member 162.

[0553] The locking member 162 and the unlocking rod 163 need to move axially and slidably cooperate with corresponding through-hole structures (such as the avoidance hole 1511, the locking hole 1522, and the guiding hole 1523). Therefore, they are generally rod-shaped and adapted to the through-hole diameter. Since the movable seat 16 needs to move with the base 15 during unlocking, at least one of the locking member 162 and the unlocking rod 163 can be in interference fit with the corresponding through-hole structure. However, the interference degree should not be too tight to avoid hindering unlocking.

[0554] The unlocking rod 163 is longer than the locking member 162. When moving, the unlocking rod 163 first abuts against the mounting head 112. When the intermediate pipe fitting 13 (together with the base) further moves distally, the unlocking rod 163 is blocked, and the locking member 162 will move relative to the intermediate pipe fitting 13 together to achieve unlocking.

[0555] In one embodiment, along the circumferential direction of the annular portion 161, the locking member 162 and the unlocking rod 163 are alternately arranged at intervals, which can reasonably distribute the force. For example, the locking member 162 and the unlocking rod 163 are respectively two, and are alternately arranged at uniform intervals.

[0556] The control member in each embodiment is a lacing 18;

[0557] In the holding state, the lacing 18 directly or indirectly winds around the interventional instrument, and both ends of the lacing 18 are relatively fixed to the locking member 162;

[0558] In the open state, at least one end of the lacing 18 is separated from the locking member 162 to release the restraint on the interventional instrument.

[0559] In order to relatively fix both ends of the binding wire 18 to the locking member 162, in one embodiment, one end of the binding wire 18 is provided with a fixed wire loop 181, and the other end is provided with a movable wire loop 182;

[0560] In the holding state, the fixed wire loop 181 is sleeved on the unlocking rod 163, and the movable wire loop 182 is sleeved on the locking member 162;

[0561] In the open state, the fixed wire loop 181 is sleeved on the unlocking rod 163, and the movable wire loop 182 is disengaged from the locking member 162.

[0562] The fixed wire loop 181 and the movable wire loop 182 are in relation to the base 15 or the movable seat 16. The movable wire loop 182 needs to switch the state of the control member, so the cooperation relationship with the locking member 162 can be changed, which is equivalent to changing the cooperation relationship with the base 15 or the movable seat 16. The fixed wire loop 181 does not need to change the cooperation relationship, that is, it always remains relatively fixed to facilitate the withdrawal of the binding wire out of the body after the operation.

[0563] In this embodiment, the fixed wire loop 181 is always sleeved or tied to the unlocking rod 163 of the movable seat 16, and the movable wire loop 182 can change the relationship with the locking member 162, which also enables the control member to switch between the holding state and the open state.

[0564] In the holding state, both the fixed wire loop 181 and the movable wire loop 182 are connected to the movable seat 16, and the middle part of the binding wire 18 is directly or indirectly wound around the interventional instrument, which can more effectively distribute the strokes of each component and improve the manipulation efficiency.

[0565] In other embodiments, the fixed wire loop 181 may not be adopted, and other methods may be used to relatively fix to the base 15 or the movable seat 16. For example, the base 15 or the movable seat 16 is drilled, and one end of the binding wire 18 is fixed in the hole, or although the fixed wire loop 181 is adopted but it is not sleeved on the unlocking rod 163, but is connected to other parts of the base 15 or the movable seat 16, as long as mutual separation is avoided.

[0566] In other embodiments, one end of the binding wire 18 is fixed to the mounting head 112, and the other end is provided with a movable wire loop 182;

[0567] In the holding state, the movable wire loop 182 is sleeved on the locking member 162;

[0568] In the open state, the movable wire loop 182 is disengaged from the locking member 162.

[0569] The end fixed to the mounting head 112 can pull the whole binding wire out of the body after the operation.

[0570] When the ligation thread is made of a suitable material, it can even remain in the body after surgery. In other embodiments, one end of the ligation thread 18 is fixed to the interventional device, and the other end is provided with a movable wire loop 182;

[0571] In the holding state, the movable wire loop 182 is sleeved on the locking member 162;

[0572] In the open state, the movable wire loop 182 is disengaged from the locking member 162.

[0573] After surgery, after each pipe fitting of the delivery system is withdrawn from the body, the ligation thread will remain in the body due to the fixation of one end to the interventional device.

[0574] The formation of each wire loop can be in the form of forming a loop near the end of the wire, or it can be wound in a back-and-forth manner, that is, not forming a loop locally. For example, the ligation thread is formed as a ring and is sleeved on the unlocking rod 163 and the locking member 162 at the same time. It is roughly the same when connected to the mounting head 112 or the interventional device.

[0575] The base 15 is fixedly arranged on the intermediate pipe fitting 13. The base 15 provides a locking hole 1522 that cooperates with the locking member 162. When the movable seat 16 and the base 15 move relative to each other, the locking member 162 and the locking hole 1522 switch the cooperation relationship. When the locking member 162 is inserted into the locking hole 1522, the fixed wire loop 181 cannot be disengaged. When the locking member 162 is withdrawn from the locking hole 1522, the fixed wire loop 181 is allowed to be disengaged from the locking member 162.

[0576] In one embodiment, in order to guide the relative movement between the movable seat 16 and the base 15, a guiding hole 1523 for the unlocking rod 163 to penetrate is provided on the base 15. In the open state, at least a part of the unlocking rod 163 remains in the guiding hole 1523.

[0577] Regarding the specific structure of the base, in one embodiment, the base 15 has an axial channel, and the distal part of the intermediate pipe fitting 13 is inserted and fixed in the axial channel. Specifically, the base 15 includes:

[0578] The proximal disk 151 is provided with a relief hole 1511 for the locking member 162 and the unlocking rod 163 to pass through respectively;

[0579] The distal disk 152 is provided with a locking hole 1522 that cooperates with the locking member 162 and a guiding hole 1523 for the unlocking rod 163 to penetrate;

[0580] The transition section 153 is fixedly connected between the proximal disk and the distal disk.

[0581] The periphery of the transition section 153 is a mating area that is radially retracted relative to the proximal disk 151 and the distal disk 152. In the holding state, the connecting parts of the lashing wire 18 with the locking member 162 and the unlocking lever 163 are all located in the mating area. The radially retracted mating area can accommodate the wire loop or knot of the lashing wire 18, and as much as possible avoid occupying the space on the outer periphery of the proximal disk 151 and the distal disk 152 in the radial direction, which is more convenient for loading.

[0582] In the open state, the locking member 162 withdraws from the locking hole 1522 until the distal part of the locking member 162 is adjacent to the proximal disk 151. That is, the locking member 162 is basically retracted into the corresponding avoidance hole 1511 to ensure the unlocking of the movable wire loop 182.

[0583] The proximal disk 151 is provided with a receiving groove 1512 on the side facing the annular part 161. The proximal ends of the locking member 162 and the unlocking lever 163 are connected through the annular part 161. In the holding state, the annular part 161 is located in the receiving groove 1512, and the avoidance hole 1511 is opened at the bottom of the receiving groove 1512.

[0584] In order to prevent the lashing wire 18 from being scattered and further regularize the extending path, in one embodiment, a wire passing groove 1521 for the lashing wire 18 to pass through is opened on the outer periphery of the distal disk 152. In a further preferred embodiment, the wire passing groove 1521 is open to the outer periphery of the distal disk 152. It is more convenient for the lashing wire 18 to extend and be in place, reducing the difficulty of threading. In some embodiments, a support sleeve 17 is fixed on the intermediate pipe fitting 13, and the outer wall of the support sleeve 17 is close to the inner wall of the second pipe fitting 12.

[0585] The support sleeve 17 can prevent the second pipe fitting 12 from being too tightly tightened on the movable seat 16 in the vicinity of the movable seat 16, so as to avoid unnecessary movement of the movable seat 16 when the second pipe fitting 12 moves. In addition, the support sleeve 17 also cooperates with the base 15 to limit the movable seat 16. For example, the support sleeve 17 is located at the proximal end of the base 15 and is arranged at intervals, and the sliding stroke of the movable seat 16 is limited between the support sleeve 17 and the base 15. When loading the interventional device, it is necessary to push the second pipe fitting 12 distally. In a preferred embodiment, the support sleeve 17 has a first guiding surface 171 that gradually tapers from the distal end to the proximal end on the side facing the proximal end.

[0586] The distal side of the second pipe fitting 12 first contacts the first guiding surface 171, and under the action of the first guiding surface 171, it gradually self-aligns and receives the support sleeve 17, and it is also relatively easy to further receive the movable seat 16 and the base 15 after passing over the support sleeve 17.

[0587] In order to save axial space, in one embodiment, the support sleeve 17 has a second guiding surface 172 on the side facing the distal end, which gradually tapers from the proximal end to the distal end. When the movable seat 16 moves proximally to the extreme position, it abuts against the second guiding surface 172.

[0588] Relative to the base 15, when the movable seat 16 moves proximally, the annular portion 161 is gradually sleeved on the second guiding surface 172. Similar to the function of the previous first guiding surface 171, under the action of the second guiding surface 172, on the one hand, the annular portion 161 is self - adaptively centered, and on the other hand, when the annular portion 161 can move along the second guiding surface 172, the stroke is further increased, ensuring the unlocking effect.

[0589] Certainly, when combined with the control handles of the foregoing hydraulic drive, in one embodiment, an interventional instrument delivery system is further provided, including a release control mechanism having the foregoing structure, and a control handle for driving the release control mechanism. The proximal ends of the pipe fittings in the release control mechanism are connected to the control handle, and the relative movement of the pipe fittings is driven in a hydraulic manner at the control handle.

[0590] It can also be combined with all the foregoing embodiments. In one embodiment, an interventional instrument delivery system is provided, including a release control mechanism and a control handle for driving the release control mechanism. The proximal ends of the pipe fittings in the release control mechanism are connected to the control handle, and the relative movement of the pipe fittings is driven in a hydraulic manner at the control handle;

[0591] Wherein the interventional instrument is loaded into the release control mechanism. The release control mechanism includes a first pipe fitting 11, an intermediate pipe fitting 13, and a second pipe fitting 12 that are slidably nested and matched with each other from the inside out. The distal end of the first pipe fitting 11 extends out of the intermediate pipe fitting 13, and a mounting head 112 for connecting the interventional instrument is provided at the extended part.

[0592] A flexible control member and a locking member 162 cooperating with the control member are connected to the intermediate pipe fitting 13. The proximal end of the interventional instrument is bound to the mounting head 112 by the control member in a compressed state, and the interventional instrument is wrapped by the second pipe fitting 12;

[0593] When the interventional instrument is released:

[0594] Relative to the first pipe fitting 11, the second pipe fitting 12 is slid proximally until the interventional instrument is completely exposed;

[0595] Relative to the first pipe fitting 11, the intermediate pipe fitting 13 is slid distally, so that the control member follows distally and allows the proximal end of the interventional instrument to gradually move away from the mounting head 112;

[0596] The locking member 162 is driven to move to release the control member, so that the interventional instrument is disengaged from the mounting head 112 and completely released.

[0597] Combined with Figures 15a - 17, by using the above release control mechanism and the interventional device delivery system, in one embodiment, a method for releasing an interventional device is further provided. The interventional device is loaded into the release control mechanism, which includes a first pipe fitting 11, an intermediate pipe fitting 13, and a second pipe fitting 12 that are slidably nested and cooperated with each other from the inside out. The distal end of the first pipe fitting 11 extends out of the intermediate pipe fitting 13, and a mounting head 112 for connecting the interventional device is provided at the extended part. A locking member 162 cooperating with the control member is installed on the intermediate pipe fitting 13. The proximal end of the interventional device is bound to the mounting head 112 by the control member in a compressed state, and the interventional device is wrapped by the second pipe fitting 12;

[0598] The release method includes:

[0599] Step S100, slide the second pipe fitting 12 proximally relative to the first pipe fitting 11 until the interventional device is completely exposed;

[0600] Step S200, slide the intermediate pipe fitting 13 distally relative to the first pipe fitting 11, so that the control member follows distally and allows the proximal end of the interventional device to gradually move away from the mounting head 112;

[0601] Step S300, drive the locking member 162 to move to release the control member, so that the interventional device is completely released.

[0602] The proximal end of the stent 10, that is, the connecting ear 101, is divided into two groups in a compressed state, and each group is gathered and pulled to be positioned in the convergence guiding hole 1121 of the mounting head 112. An annular wire sleeve 19 is wound around each connecting ear 101;

[0603] There are two tying wires 18. One end of each tying wire 18 has a fixed wire loop 181, and the other end has a movable wire loop 182. The threading method is as follows:

[0604] The fixed wire loop 181 at one end is sleeved on the unlocking rod 163, and the other end extends towards the convergence guiding hole 1121 through the wire groove 1521, and is wound with the annular wire sleeve 19 and then returns proximally. When returning proximally, it still passes through the same wire groove 1521. After returning, it is sleeved on the locking member 162 through the movable wire loop 182. The middle part of the tying wire 18 is hung on the annular wire sleeve 19 to achieve mutual pulling. According to the length of the annular wire sleeve 19, the position where the tying wire 18 is wound with the annular wire sleeve 19 can be inside the convergence guiding hole 1121 or on the proximal side outside the convergence guiding hole 1121;

[0605] After the annular wire sleeve 19 is pulled, it extends proximally through the convergence guiding hole 1121, and at the same time drives the two groups of connecting ears to converge and gather respectively. At this time, the locking member 162 is inserted into the locking hole 1522, and the unlocking rod 163 is inserted into the guiding hole 1523. Therefore, both ends of the tying wire 18 are locked, that is, in a holding state, and the annular part 161 is just received in the accommodating groove 1512.

[0606] In other embodiments, when the annular wire sleeve 19 is not provided, the threading method of the binding wire 18 is as follows:

[0607] The fixed wire loop 181 at one end is sleeved on the unlocking rod 163, and the other end extends through the wire groove 1521 to the convergence guiding hole 1121. After entering the convergence guiding hole 1121, it further extends distally and threads through the respective connection lugs of the same group. After threading through the connection lugs, it returns proximally through the same convergence guiding hole 1121. When returning proximally, it still passes through the same wire groove 1521. After returning, it is sleeved on the locking member 162 through the movable wire loop 182. The relative movement between the first pipe fitting 11, the intermediate pipe fitting 13, and the second pipe fitting 12 can utilize existing technologies or the control handles in the foregoing embodiments. For example, at the proximal end, a control handle is used and the relative movement of the pipe fittings is driven hydraulically. When the pipe fittings move relative to each other, the pressure of the hydraulic drive circuit can also be detected in real time as an operation reference or warning.

[0608] For example, in step S100, the multi-way switching valve is adjusted to the corresponding gear, and the driving pump is operated to drive the piston to move the second pipe fitting 12 proximally. During the movement, the bracket 10 will be gradually exposed and expand radially outward. When the bracket 10 is completely exposed from the second pipe fitting 12, since the connection lug 101 is still pulled and restricted by the annular wire sleeve 19 at this time, only the distal part of the bracket 10 expands and releases, and the proximal end remains in the compressed state.

[0609] In step S200, when the intermediate pipe fitting 13 slides distally relative to the first pipe fitting 11, the binding wire 18 gradually moves distally, relaxing the pull on the connection lug 101. The connection lug 101 gradually expands outward under the action of the elasticity of the bracket 10, disengages from the convergence guiding hole 1121, and gradually moves away from the mounting head 112. Since the binding wire 18 always maintains the pull, the speed and amplitude of the proximal expansion of the bracket are controllable. When adjustment or recovery is required due to improper position or attitude, the intermediate pipe fitting 13 can be slid proximally relative to the first pipe fitting 11, that is, the connection lug is pulled back and gathered to the convergence guiding hole 1121 through the binding wire 18, and the second pipe fitting 12 can be slid distally to re-store the bracket 10.

[0610] When the intermediate pipe fitting 13 slides distally, since the base 15 and the movable seat 16 are inserted into each other and are pulled by the binding wire 18, sufficient frictional resistance is obtained between the base 15 and the movable seat 16, causing the movable seat 16 to follow distally, that is, the locking member 162 always remains in the locking hole 1522, and the unlocking rod 163 also always remains in the guiding hole 1523, preventing the movable wire loop 182 of the binding wire 18 from loosening.

[0611] In step S300, the method of driving the locking member to move and release the control member is to slide the intermediate pipe fitting 13 distally relative to the first pipe fitting 11 until the triggering end 1631 of the unlocking rod 163 abuts against the proximal side of the mounting head 112;

[0612] When further sliding the intermediate pipe fitting 13 distally, the unlocking lever 163 is blocked, the movable seat 16 cannot follow, and overcomes the frictional resistance to separate from the base 15. The locking member 162 gradually withdraws from the locking hole 1522. When the locking member 162 gradually retracts into the avoidance hole 1511, it also separates from the movable wire loop 182, releasing the binding wire 18 until the movable seat 16 abuts against the support sleeve 17, that is, reaching the limit position, or the base 15 abuts against the mounting head 112, which can also be used as a way to limit the limit stroke.

[0613] Since the movable wire loop 182 disengages from the locking member 162 and no longer restrains the connecting ear 101, the bracket 10 can be completely released.

[0614] After the bracket 10 is completely released, first slide the intermediate pipe fitting 13 proximally relative to the first pipe fitting 11 to separate the base 15 from the mounting head 112, avoiding clamping the binding wire 18 between the two and ensuring the complete release of the bracket. Then, retract the first pipe fitting 11 and the intermediate pipe fitting 13 into the second pipe fitting 12, and synchronously retract all the pipe fittings proximally.

[0615] Figures 18a - 18c In it, the structure and application scenario of the vena cava valve are further illustrated. The vena cava is divided into the superior vena cava 1300 and the inferior vena cava 1200, both of which are connected to the right atrium 1000, and the right atrium 1000 is connected to the right ventricle 1100 through the tricuspid valve. That is, this embodiment also discloses a vena cava valve replacement system for implanting a vena cava valve at the superior or inferior vena cava via the femoral vein, including the vena cava valve and each of the above-mentioned interventional device delivery systems.

[0616] The vena cava valve can be placed either in the superior vena cava 1300 (adjacent to the right atrium 1000) or in the inferior vena cava 1200 according to requirements. In terms of its own structure, the vena cava valve includes:

[0617] A bracket 10, the bracket 10 is a net cylinder structure and has a blood flow channel inside. The bracket 10 has opposite inflow and outflow ends in the axial direction.

[0618] For the convenience of positioning, it can also include:

[0619] Valve leaflets 102, the valve leaflets are connected in the blood flow channel of the bracket and can open or close the blood flow channel under the action of blood flow;

[0620] An expansion mask 103, the expansion mask 103 is connected to the bracket 10 and surrounds the outer periphery of the outflow end. The expansion mask 103 is an expansion structure facing away from the inflow end.

[0621] A plurality of connecting lugs 101 are provided at the inflow end of the stent 10. An annular wire sleeve 19 can be threaded through the connecting lugs 101. In addition, the end of the expansion mask 103 and the outflow end of the stent 10 are respectively provided with V-shaped parts. The annular wire sleeve 19 or the tying wire 18 can also be threaded through each V-shaped part for release control according to the release or traction direction.

[0622] The stent 10 successively includes along the blood flow direction:

[0623] An inflow section 106, on one side of the inflow end;

[0624] A waist portion 105, at the middle of the axis of the stent 10;

[0625] An outflow section 104, extending from the part where the expansion mask 103 is connected to the stent 10 towards the outflow end side;

[0626] Of course, each part of the stent 10 has an opposite inflow side and outflow side.

[0627] In some embodiments, not only for the vena cava valve, when setting the annular wire sleeve 19 in an interventional device with connecting lugs or similar structures, different threading methods and connections with the tying wire 18 can be adopted.

[0628] Figure 19a In [a certain situation], there are two tying wires 18. One end of each tying wire is provided with a fixed wire loop 181, and the other end is provided with a movable wire loop 182. One tying wire bypasses the connection point M1 to realize the traction with the annular wire sleeve 19, and the other tying wire bypasses the connection point M2 to realize the traction with the annular wire sleeve 19. And the two connection points do not bisect the annular wire sleeve 19, that is, the corresponding central angle is less than 180 degrees. Taking six connecting lugs as an example, there are four on one side of the line connecting the two connection points and two on the other side. Figure 19b In [a certain situation], there are four tying wires 18. One end of each tying wire is provided with a fixed wire loop 181, and the other end is provided with a movable wire loop 182. Each tying wire bypasses the corresponding connection point to realize the traction with the annular wire sleeve 19, that is, there are four connection points.

[0629] Figure 19c In [a certain situation], there are two tying wires 18. One end of each tying wire is provided with a fixed wire loop 181, and the other end is provided with a movable wire loop 182. One tying wire bypasses the connection point M1 to realize the traction with the annular wire sleeve 19, and the other tying wire bypasses the connection point M2 to realize the traction with the annular wire sleeve 19. And the two connection points bisect the annular wire sleeve 19, that is, the corresponding central angle is approximately equal to 180 degrees. Taking six connecting lugs as an example, there are three on one side of the line connecting the two connection points and three on the other side.

[0630] Figure 19dAmong them, there are three lashing wires 18. One end of each lashing wire is provided with a fixed wire loop 181, and the other end is provided with a movable wire loop 182. Each lashing wire bypasses the corresponding connection point to realize the pulling with the annular wire sleeve 19, that is, there are three connection points.

[0631] Figure 19c Among them, the annular wire sleeve 19 is also connected with two cross segments 191. There are two lashing wires 18. One end of each lashing wire is provided with a fixed wire loop 181, and the other end is provided with a movable wire loop 182. One lashing wire bypasses the connection point M1 to realize the pulling with the cross segment 191, and the other lashing wire bypasses the connection point M2 to realize the pulling with the cross segment 191. The lashing wire 18 indirectly pulls the annular wire sleeve 19 through the cross segment 191. Through the cross segment 191, the force application points can be configured more flexibly, which is convenient for grouping and binding the connecting ears, and adjusting the turning point when the lashing wire extends to the distal end, that is, the length of the lashing wire 18 can also be adjusted flexibly.

[0632] Figures 19a - 19e The figure mainly shows the combination mode of the lashing wire 18 and the annular wire sleeve 19, and does not limit the pulling direction of the lashing wire 18. The direction of the lashing wire 18 in the figure is only for the convenience of marking and reading.

[0633] The technical features of the above embodiments can be combined arbitrarily. For the sake of concise description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification. When the technical features in different embodiments are shown in the same drawing, it can be regarded that the drawing also discloses the combination examples of the respective embodiments involved at the same time.

[0634] The above embodiments only represent several implementation manners of the present application. The description is relatively specific and detailed, but it should not be understood as a limitation to the scope of the patent application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several deformations and improvements can still be made, and these all belong to the protection scope of the present application.

Claims

1. An interventional device delivery system, comprising an interventional device release control mechanism and a control handle for driving the release control mechanism, characterized in that, The release control mechanism comprises a first tube, an intermediate tube and a second tube which are slidably nested from the inside to the outside in sequence, the distal end of the first tube extends out of the intermediate tube, and a mounting head for connecting an interventional instrument is provided on the extended portion, and a flexible control member is connected to the intermediate tube, and the control member has: a holding state, in which the control member penetrates the mounting head and restrains the interventional instrument to the mounting head; The open state allows the interventional device to be completely detached from the mounting head; The intermediate pipe is provided with a lock member matched with the control member, and the lock member is slidably matched with the intermediate pipe and switches different states of the control member when sliding; The proximal end of each pipe in the release control mechanism is connected to a control handle, and a first cylinder and a second cylinder which are connected in sequence along the axial direction are arranged in the control handle, wherein a first piston is slidably installed in the first cylinder, and a second piston is slidably installed in the second cylinder; All pipes enter from the distal end of the first cylinder, wherein the first pipe is fixed to the first piston, the intermediate pipe extends out of the first piston, enters the second cylinder via the isolation seal and is fixed to the second piston, and the first pipe extends out of the second piston and is fixed to the proximal end of the second cylinder; A hydraulic drive circuit is also provided at the control handle for driving the relative movement of the pipes through a piston, and the hydraulic drive circuit includes at least one drive pump for driving the flow of liquid, and a control valve for controlling the flow direction of the liquid; The control valve adopts a multi-way switching valve, and the multi-way switching valve comprises: Two valve seats arranged opposite to each other, one of which is provided with a driving side interface connected to the hydraulic driving circuit, and the other valve seat is provided with a working side interface of the hydraulic driving circuit; A valve core which is sealed and fastened by two valve seats and is rotatably installed, wherein the valve core has a communication hole. When the valve core is rotated to different angles, the communication hole connects the corresponding drive side interface with the working side interface; The wrench linked with the valve core is used to change the rotation angle of the valve core, and the wrench serves as an operating component of the control valve.

2. The interventional device delivery system according to claim 1, wherein The control member is a ligature wire, and the proximal end of the interventional instrument has a plurality of connection ears. In the holding state: The binding wire directly passes through and pulls each connecting ear; Or an annular wire sleeve is passed between each connecting ear, and the binding wire passes around the annular wire sleeve and indirectly pulls the connecting ear through the annular wire sleeve.

3. The interventional device delivery system according to claim 2, wherein, There are multiple binding wires, and the pulling positions of each binding wire and the annular wire sleeve are evenly distributed along the circumference of the interventional instrument.

4. The interventional device delivery system according to claim 2, wherein, The intermediate pipe is provided with a fixed base and a slidable movable base, the movable base is provided with a lock and an unlocking rod, the unlocking rod penetrates the base from the proximal end to the distal end and one end of the unlocking rod passes through the base as a trigger end, and the base is provided with a lock hole for receiving the lock; The control member is sleeved on the lock member in a retaining state, and the end of the lock member is inserted into the lock hole; When the intermediate tube moves toward the distal end relative to the first tube, the trigger end of the unlocking rod abuts against the mounting head and drives the locking element to move toward the proximal end and exit the locking hole, so that the control element enters an open state.

5. The interventional device delivery system according to claim 4, wherein, A support sleeve is fixed on the intermediate pipe fitting. The support sleeve is located at the proximal end of the base and is arranged at intervals. The sliding stroke of the movable seat is limited between the support sleeve and the base.

6. The interventional device delivery system according to claim 5, wherein, The outer wall of the support sleeve is close to the inner wall of the second pipe fitting.

7. The interventional device delivery system according to claim 5, wherein On the side of the support sleeve facing the proximal end, there is a first guiding surface with a gradually decreasing diameter from the distal end to the proximal end.

8. The interventional device delivery system according to claim 7, characterized in that, On the side of the support sleeve facing the distal end, there is a second guiding surface with a gradually decreasing diameter from the proximal end to the distal end. When the movable seat moves to the extreme position towards the proximal end, it abuts against the second guiding surface.

9. The interventional device delivery system according to claim 4, wherein The base has an axial channel, and the distal part of the intermediate pipe fitting is inserted and fixed in the axial channel. The base includes: A proximal disk, which is provided with avoidance holes for the locking member and the unlocking rod to pass through respectively; A distal disk, which is provided with a locking hole cooperating with the locking member and a guiding hole for the unlocking rod to penetrate through; A transition section, which is fixedly connected between the proximal disk and the distal disk.

10. The interventional device delivery system according to claim 9, wherein, The periphery of the transition section is a fitting area that is radially reduced relative to the proximal disk and the distal disk. In the holding state, the connection parts of the binding wire with the locking member and the unlocking rod are both located in the fitting area.

11. The interventional device delivery system according to claim 1, wherein, The mounting head is provided with a converging guiding hole, and the control member passes through the converging guiding hole to connect the interventional device. In the holding state, the proximal side of the interventional device is restricted in the converging guiding hole.

12. The interventional device delivery system according to claim 2, wherein, In the holding state, the binding wire directly or indirectly winds around the interventional device, and both ends of the binding wire are relatively fixed to the locking member; In the open state, at least one end of the binding wire is separated from the locking member to release the restraint on the interventional device.

13. The interventional device delivery system according to claim 2, wherein Before the interventional device is released, the binding wire directly or indirectly winds around the interventional device, and both ends of the binding wire are relatively fixed to the locking member; After the interventional device is released, at least one end of the binding wire is separated from the locking member to release the restraint on the interventional device.

14. The interventional device delivery system according to claim 4, wherein One end of the binding wire is provided with a fixed wire loop, and the other end is provided with a movable wire loop; the fixed wire loop is sleeved on the unlocking rod, and the movable wire loop is sleeved on the locking member; Or, one end of the binding wire is fixed to the base or the mounting head, and the other end is a movable wire loop, which is sleeved on the locking member.

15. The interventional device delivery system according to claim 1, wherein, The interventional device is an inferior vena cava valve.

16. The interventional device delivery system according to claim 1, wherein A circular wire sleeve cooperating with the control member is provided at the proximal end of the interventional device.

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