A handle, delivery device and medical system

Abstract

The application provides a handle, comprising a base, a transmission seat arranged on a guide rail of the base; a transmission part arranged on the transmission seat; an outer tube seat connected with the transmission part and selectively connected or disconnected with the guide rail; an inner tube seat connected with the transmission part; and a driving part for driving the inner tube seat to move axially relative to the guide rail; when the outer tube seat is disconnected with the guide rail and the driving part drives the inner tube seat to move from the proximal end to the distal end, the transmission seat keeps relatively static with the guide rail, the transmission part transmits power between the inner tube seat and the outer tube seat and drives the outer tube seat to move from the distal end to the proximal end; when the outer tube seat is connected with the guide rail and the driving part drives the inner tube seat to move from the distal end to the proximal end, the outer tube seat keeps relatively static with the guide rail, the transmission part transmits power between the inner tube seat and the transmission seat and drives the transmission seat to move from the distal end to the proximal end. The handle can be used to improve the release accuracy of medical implants and reduce the release resistance.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of medical devices, in particular to a handle, a delivery device and a medical system. BACKGROUND

[0002] With the development of endoluminal techniques, the use of medical implants such as medical stents has gained wide acceptance by radiologists, cardiologists and surgeons. These medical implants are used to support various lumina in the body including arteries, veins, airways, gastrointestinal tract, biliary tract, etc. The preferred method of implanting medical implants is to use a dedicated delivery device to precisely deliver and release the medical implant at a predetermined location via the body's own lumina. With the aid of the small outer diameter of the delivery device, the surgeon can minimize the surgical incision to achieve minimally invasive operation.

[0003] Medical implants are generally plastically deformable (e.g. medical stents expanded by a balloon) or elastically deformable (e.g. self-expandable medical stents). The medical implant is delivered by the delivery device to the predetermined location of the target lumen in a compressed state, and after being released, the medical implant can be expanded to the working state diameter by external force (e.g. the force provided by the balloon) or under its own action.

[0004] For self-expandable stents, especially braided stents, significant axial elongation occurs when they are compressed onto the delivery device, usually more than twice the initial length. During the release of the medical stent, the medical stent shortens axially due to radial expansion, which can cause the medical stent to deviate from the predetermined position, thereby adversely affecting the treatment effect. SUMMARY

[0005] The purpose of the present application is to provide a handle, a delivery device and a medical system, aiming to improve the positioning accuracy of the medical implant during release, thereby improving the treatment effect.

[0006] To achieve the above-mentioned purpose, the present application provides a handle, comprising:

[0007] a base comprising a guide rail and a transmission seat arranged on the guide rail;

[0008] a transmission part arranged on the transmission seat;

[0009] an outer tube seat connected with the transmission part and selectively connected or disconnected with the guide rail;

[0010] an inner tube seat connected with the transmission part; and

[0011] a driving part configured to drive the inner tube seat to move axially relative to the guide rail;

[0012] When the outer tube base is disconnected with the guide rail and the driving part drives the inner tube base to move in the direction from the proximal end to the distal end, the transmission base keeps relatively static with the guide rail, the transmission part transmits power between the inner tube base and the outer tube base, and drives the outer tube base to move in the direction from the distal end to the proximal end; when the outer tube base is connected with the guide rail and the driving part drives the inner tube base to move in the direction from the distal end to the proximal end, the outer tube base keeps relatively static with the guide rail, the transmission part transmits power between the inner tube base and the transmission base, and drives the transmission base to move in the direction from the distal end to the proximal end.

[0013] Optionally, a plurality of first limiting parts are arranged on the guide rail in an axial direction.

[0014] The transmission base comprises a second limiting part, which is selectively connected with one of the first limiting parts to allow the transmission base to move in the direction from the distal end to the proximal end and prevent the transmission base from moving in the direction from the proximal end to the distal end.

[0015] Optionally, the first limiting part is a limiting slot, and the second limiting part comprises a first clasp, which comprises a first clamping head selectively inserted into one of the limiting slots.

[0016] Optionally, the first clamping head comprises a straight plane and a first inclined plane, the straight plane is perpendicular to the axis of the handle, the first inclined plane is located on the proximal side of the straight plane, and the distance from the first inclined plane to the straight plane gradually decreases in the direction close to the axis of the handle.

[0017] Optionally, the number of guide rails is two, and the two guide rails are arranged in parallel; the transmission base further comprises a first seat body having an axially-through first inner cavity, the first inner cavity is for the guide rail to pass through, and the cavity wall of the first inner cavity abuts against the outer surface of the guide rail; the second limiting part is connected to the first seat body and has a number of two, the two second limiting parts are arranged at equal intervals in the circumferential direction of the first seat body, and each second limiting part is used to connect with the first limiting part on one of the guide rails.

[0018] Optionally, the transmission base further comprises a mounting plate arranged on the cavity wall of the first inner cavity and dividing the first inner cavity into two axially-through sub-chambers, each of which is for one of the guide rails to pass through; the transmission part is arranged on the mounting plate.

[0019] Optionally, the base further comprises a holding part and an end cover, one end of the guide rail is connected with the holding part, and the other end is connected with the end cover.

[0020] Optionally, the outer tube base comprises a third limiting part, when the third limiting part is selectively connected with one of the first limiting parts, the outer tube base is connected with the guide rail and at least prevents the outer tube base from moving in a distal to proximal direction relative to the guide rail, when the third limiting part is disengaged from the first limiting part, the outer tube base is disengaged from the guide rail and allows the outer tube base to move relative to the guide rail.

[0021] Optionally, the first limiting part is a limiting groove; the outer tube base further comprises a second base body, the second base body is connected with the transmission part; the third limiting part is arranged on the second base body and comprises a second buckle, the second buckle comprises a second clamping head;

[0022] When the second clamping head is selectively inserted into one of the limiting grooves, the outer tube base is connected with the guide rail, when the second clamping head is disengaged from the limiting groove, the outer tube base is disengaged from the guide rail.

[0023] Optionally, the transmission base further comprises a first base body, the second limiting part is connected on the first base body; the first base body has an axially through first inner cavity, the first inner cavity is for the guide rail to pass through; the first base body is provided with a first through groove, a second through groove and a third through groove which are in communication with the first inner cavity; the second base body has an axially through second inner cavity, and the second base body is provided with a fourth through groove which is in communication with the second inner cavity; the inner tube base comprises a third base body, the third base body has an axially through third inner cavity;

[0024] The second base body is sleeved on part of the outer circumferential surface of the first base body, and the fourth through groove is in communication with the second through groove; the third base body is sleeved on at least part of the outer circumferential surface of the second base body and also covers part of the outer circumferential surface of the first base body;

[0025] The second base body is connected with the transmission part at the first through groove; the third base body is connected with the transmission part at the second through groove and the fourth through groove; the second clamping head of the second buckle passes through the third through groove to insert into one of the limiting grooves.

[0026] Optionally, the second seat body is provided with a mounting groove in communication with the third through groove; the second buckle comprises a connecting portion rotatably arranged at the mounting groove and having a first free end and a second free end opposite in the axial direction; the second clamping head is arranged at the first free end of the connecting portion; the third limiting portion further comprises a first elastic member, one end of the first elastic member being connected with the second seat body and the other end being connected with the second free end of the connecting portion, so that the second free end of the connecting portion protrudes out of the mounting groove in the radial direction and the second clamping head is inserted into one of the limiting grooves.

[0027] When the second free end of the connecting portion is subjected to a radial force directed towards the axis of the handle, the connecting portion rotates to make the second clamping head disengage from the limiting groove and make the first elastic member store elastic potential energy, and when the radial force is cancelled, the first elastic member releases the elastic potential energy.

[0028] Optionally, the third seat body is provided with a fifth through groove in communication with the third inner cavity, the fifth through groove being in communication with the mounting groove and having a first side and a second side opposite in the circumferential direction; the inner tube seat further comprises a pressing plate arranged at the first side of the fifth through groove and a second elastic member, one end of the second elastic member being connected with the pressing plate and the other end spanning the fifth through groove and being connected with the third seat body.

[0029] When the second clamping head is inserted into one of the limiting grooves, the second free end of the connecting portion further protrudes out of the fifth through groove in the radial direction;

[0030] The pressing plate is used to move in the direction from the first side to the second side and press against at least part of the outer surface of the connecting portion, to apply the radial force to the second free end of the connecting portion and make the second elastic member store elastic potential energy, and when the second elastic member releases the elastic potential energy, the pressing plate is driven to move in the direction from the second side to the first side and stop applying the radial force to the second free end of the connecting portion.

[0031] Optionally, the outer surface of the pressing plate is provided with a linear guide groove, the extension direction of the guide groove being perpendicular to the axis of the handle; the inner tube seat further comprises a guide mechanism in a linear configuration, one end of the guide mechanism being located at the second side of the fifth through groove and being connected with the third seat body, the other end of the guide mechanism extending in a direction perpendicular to the axis of the handle and spanning the fifth through groove, and the guide mechanism being partially accommodated in the guide groove.

[0032] Optionally, at least part of the outer surface of the connecting portion is a second inclined surface, an edge of the second inclined surface close to the first side of the fifth through slot is flush with the outer surface of the third seat body or is located inside the fifth through slot, and an edge of the second inclined surface close to the second side of the fifth through slot protrudes radially beyond the fifth through slot.

[0033] Optionally, the driving portion is arranged on the third seat body and is further configured to drive the pressing plate to move in the direction from the first side to the second side.

[0034] Optionally, the third seat body comprises a first segment and a second segment arranged at the proximal end of the first segment, the outer diameter of the second segment is smaller than that of the first segment, and the proximal end of the second segment is further provided with a limiting portion; a third inclined surface is formed on the side of the pressing plate away from the fifth through slot, and the distance of the third inclined surface to the fifth through slot gradually increases in the direction from the proximal end to the distal end.

[0035] The driving portion comprises an operating mechanism and a third elastic member, the operating mechanism is sleeved on the third seat body and is configured to keep circumferential relative static with the third seat body and is capable of moving axially relative to the third seat body; a fourth inclined surface is further formed on the inner surface of the operating mechanism, the inclination direction of the fourth inclined surface is the same as that of the third inclined surface, and the fourth inclined surface at least partially abuts against the third inclined surface; a stop ring is further formed on the operating mechanism; the third elastic member is arranged on the second segment, and the proximal end of the third elastic member and the limiting portion jointly hold the stop ring.

[0036] Optionally, the transmission portion comprises a central shaft, a gear unit, a first rack and a second rack; the central shaft is arranged on the transmission seat, the gear unit is sleeved on the central shaft, the first rack and the second rack are arranged on opposite sides of the gear unit respectively, and the first rack and the second rack are both engaged with the gear unit; the first rack is further connected with the outer tube seat, and the second rack is further connected with the inner tube seat.

[0037] Optionally, the gear unit comprises a first gear and a second gear, the first gear and the second gear are both sleeved on the central shaft, and the first gear and the second gear are configured to keep circumferential relative static; the first gear is engaged with the second rack, and the second gear is engaged with the first rack.

[0038] To achieve the above object, the application further provides a delivery device comprising a catheter mechanism and the handle as described above; the catheter mechanism comprises an inner tube, a barb and an outer tube, a proximal end of the inner tube is connected with the inner tube seat, one end of the barb is connected with the outer peripheral surface of a distal end of the inner tube, the other end is a third free end, and the third free end is directed to the distal end of the inner tube; the outer tube is partially sleeved on the outer peripheral surface of the inner tube, and a proximal end of the outer tube is connected with the outer tube seat.

[0039] To achieve the above object, the application further provides a medical system comprising a medical implant and the delivery device as described above; the medical implant is provided with a plurality of pores, and at least part of the pores are arranged along the axial direction of the medical implant; the catheter mechanism is used for loading the medical implant, and the barb is used for selectively inserting into part of the pores.

[0040] Optionally, the medical implant is a self-expanding medical stent.

[0041] Compared with the prior art, the handle, the delivery device and the medical system of the application have the following advantages:

[0042] The aforementioned handle includes a base, a transmission part, an outer tube seat, an inner tube seat and a driving part; the base includes a guide rail and a transmission seat arranged on the guide rail; the transmission part is arranged on the transmission seat; the outer tube seat is connected to the transmission part and is also selectively connected or disconnected from the guide rail; the inner tube seat is connected to the transmission part, and the driving part is configured to drive the inner tube seat to move axially relative to the guide rail; when the outer tube seat is disconnected from the guide rail, and the driving part drives the inner tube seat to move along the proximal end When the handle moves in the distal direction, the transmission seat and the guide rail remain relatively stationary, and the transmission unit transmits power between the inner tube seat and the outer tube seat, driving the outer tube seat to move in the direction from the distal end to the proximal end. When the outer tube seat is connected to the guide rail and the driving unit drives the inner tube seat to move in the direction from the distal end to the proximal end, the outer tube seat and the guide rail remain relatively stationary, and the transmission unit transmits power between the inner tube seat and the transmission seat, driving the transmission seat to move in the direction from the distal end to the proximal end. The handle is applied to a delivery device for a medical implant, wherein the inner tube seat is connected to the inner tube of the delivery device, and the outer tube seat is connected to the outer tube of the delivery device, the inner tube and the outer tube are nested and are used to load a medical implant in a compressed state, and the distal end of the inner tube is provided with a barb, which is used to insert into a partial pore of the medical implant. When the delivery device delivers the compressed medical implant to a predetermined position in the target lumen, it begins releasing the medical implant. During the release process, the driving unit drives the inner tube seat to move in a proximal-to-distal direction, driving the inner tube and the entire medical implant to move in a proximal-to-distal direction. Simultaneously, the outer tube seat drives the outer tube to move in a distal-to-proximal direction. This overall proximal-to-distal movement of the medical implant compensates for axial shortening caused by radial expansion during the release process, thereby improving positioning accuracy during release and enhancing therapeutic efficacy. Furthermore, the driving unit alternately drives the inner tube seat to move in proximal-to-distal and distal-to-proximal directions, allowing the inner tube to repeatedly move axially. The barbs are then used to gradually remove the medical implant, reducing the problem of high release resistance and improving the patency of the medical implant during release. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] The accompanying drawings are provided for a better understanding of the present invention and are not intended to limit the present invention.

[0044] Figure 1 is a schematic structural diagram of a handle provided according to an embodiment of the present invention;

[0045] Figure 2is a structural schematic view of a delivery device provided by the present application according to an embodiment;

[0046] Figure 3 is a schematic view of a catheter mechanism of the delivery device provided by the present application according to an embodiment when loading a medical stent;

[0047] Figure 4 is an assembly relationship schematic view of a fixing part, a guide rail and an end cover of a base of a handle according to an embodiment of the present application;

[0048] Figure 5 is Figure 4 is an enlarged schematic view of A in

[0049] Figure 6 is a structural schematic view of a transmission seat of a base of a handle according to an embodiment of the present application, in which a second limiting part is partially blocked by a first seat body;

[0050] Figure 7 is a structural schematic view of a base of a handle according to an embodiment of the present application, in which a first seat body is partially cut to show a second limiting part;

[0051] Figure 8 is Figure 7 is an enlarged schematic view of B in

[0052] Figure 9 is an assembly relationship schematic view of a transmission seat, a transmission part, an outer tube seat and an inner tube seat of a handle according to an embodiment of the present application;

[0053] Figure 10 is Figure 9 is an A-A sectional view of

[0054] Figure 11 is a structural schematic view of an outer tube seat according to an embodiment of the present application, in which the assembly relationship between the outer tube seat and a second rack is also shown;

[0055] Figure 12 is a structural schematic view of a second seat body of an outer tube seat of a handle according to an embodiment of the present application, in which an outer tube connector is also shown;

[0056] Figure 13 is Figure 11 is an enlarged schematic view of C in

[0057] Figure 14 is Figure 11 is an enlarged schematic view of D in

[0058] Figure 15 is a partial structural schematic view of a third limiting part of an outer tube seat of a handle according to an embodiment of the present application;

[0059] Figure 16 is a schematic view of a partial structure of an inner tube seat of a handle according to an embodiment of the present application;

[0060] Figure 17 is a schematic view of an assembly relationship of a third seat body of a transmission seat, an outer tube seat, and an inner tube seat of a handle according to an embodiment of the present application, in which a second buckle is not shown;

[0061] Figure 18 is a schematic view of a cooperation relationship of a pressing plate and a second elastic member of a handle according to an embodiment of the present application;

[0062] Figure 19 is a schematic view of an assembly relationship of a pressing plate and an inner tube seat, an outer tube seat, a transmission part, and a transmission seat of a handle according to an embodiment of the present application;

[0063] Figure 20 is Figure 19 is an enlarged schematic view of E in

[0064] Figure 21 is a schematic view of an assembly relationship of a driving part and an inner tube seat, an outer tube seat, and a transmission seat of a handle according to an embodiment of the present application.

[0065] [The following reference signs are used:]

[0066] 100-handle, 1000-base, 1100-guide rail, 1110-first limiting part, 1200-transmission seat, 1210-second limiting part, 1211-first clamping head, 1211a-straight plane, 1211b-first inclined surface, 1212-first connecting part, 1300-grip, 1400-end cover, 1220-first seat body, 1221-first inner cavity, 1222-first through slot, 1223-second through slot, 1224-third through slot, 1230-mounting plate, 2000-transmission part, 2100-center shaft, 2200-gear unit, 2210-first gear, 2220-second gear, 2230-circumferential limiting piece, 2300-first rack, 2400-second rack, 3000-outer tube seat, 3100-third limiting part, 3110-second clamping buckle, 3111-second clamping head, 3112-second connecting part, 3120-pivot, 3112a-first free end, 3112b-second free end, 3112c-second inclined surface, 3130-first elastic piece, 3200-second seat body, 3201-second inner cavity, 3202-mounting slot, 3203-fourth through slot, 3210-mounting block, 3211-clamping slot, 3300-outer tube connecting piece, 4000-inner tube seat, 4100-third seat body, 4110-first segment, 4120-second segment, 4101-third inner cavity, 4102-fifth through slot, 4102a-first side, 4102b-second side, 4103-limiting rib, 4104-limiting part, 4200-inner tube connecting piece, 4300-pressing plate, 4301-guiding slot, 4302-third inclined surface, 4400-second elastic piece, 4500-guiding mechanism, 5000-driving part, 5100-operating mechanism, 5101-fourth inclined surface, 5110-stop ring, 5200-third elastic piece,

[0067] 200-catheter mechanism, 210-outer tube, 220-inner tube, 230-barb;

[0068] 300-guide head;

[0069] 10-conveying device;

[0070] 20-medical stent. DETAILED DESCRIPTION

[0071] The present application is herein described, by way of example only, with the comprehension that the advantages and utility thereof are apparent and that modifications can be implemented therefrom by those of ordinary skill in the art without departing from the spirit of the present application. The present application is also not to be limited in scope by the specific embodiments disclosed herein. Indeed, various modifications of the embodiments, in addition to those described herein, will be apparent to one of ordinary skill in the art from the disclosure herein. The intended scope of the present application is set forth in the claims below. The specification and drawings are accordingly to be regarded as illustrative rather than a restrictive sense. It is to be understood that the figures included are only schematic and that actual implementations can differ from the presented examples. The figures are only intended to facilitate the description of the present application and are not intended to limit the scope of the present application.

[0072] In addition, each of the embodiments described below has one or more technical features, but this does not mean that all technical features in any embodiment must be implemented at the same time, or that only one or all technical features in different embodiments can be implemented separately. In other words, under the premise of implementation, those skilled in the art can selectively implement part or all of the technical features in any embodiment according to the disclosure of the present application, and according to the design specification or implementation requirements, or selectively implement a combination of part or all of the technical features in multiple embodiments, thereby increasing the flexibility of the implementation of the present application.

[0073] As used in this specification, the singular forms "a," "an" and "the" include plural referents unless the content clearly dictates otherwise. As used in this specification, the term "or" is generally employed in its sense of "and / or" unless the content clearly dictates otherwise, and the terms "mounting", "connected", "connecting" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral connection. It can be mechanical connection, or electrical connection. It can be directly connected, or indirectly connected through an intermediate medium, or the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0074] In this document, the terms "proximal" and "distal" refer to the relative orientation, position, direction of elements or actions relative to each other from the perspective of the physician using the medical device, although "proximal" and "distal" are not limiting, but "proximal" generally refers to the end of the medical device closer to the physician during normal operation, and "distal" generally refers to the end closer to the patient.

[0075] To make the objects, advantages, and features of the present invention more apparent, the present invention is further described below in detail with reference to the accompanying drawings. It should be noted that the drawings are greatly simplified and not to exact scale, and are intended solely to facilitate and clearly illustrate the embodiments of the present invention. The same or similar reference numerals in the drawings represent the same or similar components.

[0076] Figure 1 FIG. 1 shows a schematic structural diagram of a handle 100 provided in one embodiment of the present invention. Figure 1 As shown, the handle 100 includes a base 1000, a transmission part 2000 ( Figure 1 Not shown, see Figure 9 and Figure 10 ), an outer tube seat 3000, an inner tube seat 4000, and a drive unit 5000. The base 1000 includes a guide rail 1100 and a transmission seat 1200. The transmission unit 2000 is disposed on the transmission seat 1200. The outer tube seat 3000 is connected to the transmission unit 2000 and is also selectively connected to or disconnected from the guide rail 1100. When the outer tube seat 3000 is connected to the guide rail 1100, it is at least prevented from moving in a distal-to-proximal direction relative to the guide rail 1100. When the outer tube seat 3000 is disconnected from the guide rail 1100, it is allowed to move relative to the guide rail 1100. The inner tube seat 4000 is connected to the transmission unit 2000. The drive unit 5000 is configured to drive the inner tube seat 4000 to move axially relative to the guide rail 1100. The “axial” mentioned herein generally refers to the axial direction of the handle 100 , the “radial” refers to the direction perpendicular to the axial direction of the handle 100 , and the “circumferential” refers to the direction surrounding the axis of the handle 100 , unless otherwise expressly stated in the content.

[0077] When the outer tube base 3000 is disconnected from the guide rail 1100 and the driving unit 5000 drives the inner tube base 4000 to move in the direction from the proximal end to the distal end, the transmission base 1200 and the guide rail 1100 remain relatively stationary, and the transmission unit 2000 transmits power between the inner tube base 4000 and the outer tube base 3000 to drive the outer tube base 3000 to move in the direction from the distal end to the proximal end. When the outer tube base 3000 is connected to the guide rail 1100 and the driving unit 5000 drives the inner tube base 4000 to move in the direction from the distal end to the proximal end, the outer tube base 3000 and the guide rail 1100 remain relatively stationary, and the transmission unit 2000 transmits power between the inner tube base 4000 and the transmission base 1200 to drive the transmission base 1200 to move in the direction from the distal end to the proximal end.

[0078] Please refer toFigure 2 The handle 100 is applied to a delivery device 10. The delivery device 10 further comprises a catheter mechanism 200, as shown in Figure 2 and Figure 3 The catheter mechanism 200 comprises an outer tube 210, an inner tube 220 and a barb 230. The proximal end of the outer tube 210 is connected with the outer tube seat 3000. The inner tube 220 is partially arranged in the outer tube 210, and the proximal end of the inner tube 220 extends out of the outer tube 210 and is connected with the inner tube seat 4000. One end of the barb 230 is connected to the outer surface of the distal end of the inner tube 220, and the other end is a third free end which is directed towards the distal end of the inner tube 220. The catheter mechanism 200 is used to load a medical implant, and the medical implant is provided with a plurality of apertures which are arranged along the axial direction of the medical implant. When the medical implant is at least partially located between the inner tube 220 and the outer tube 210, the barb 230 is used to selectively insert into some of the apertures. Optionally, the medical implant comprises a self-expandable medical stent 20. It can be understood that the self-expandable medical stent 20 refers to the medical stent which is made of a material with high elasticity, such as nickel-titanium alloy, and can be formed by wire knitting. The medical stent 20 is taken as an example for description herein.

[0079] The delivery device 10 is used to deliver the medical stent 20 to a predetermined position of a target lumen in the body of a patient for release. The process of release can comprise the following steps:

[0080] Step S1: disconnect the outer tube seat 3000 from the guide rail 1100, and drive the inner tube seat 4000 to move in the proximal-to-distal direction by the driving part 5000, so as to drive the inner tube 220 to move in the proximal-to-distal direction, and drive the medical stent 20 to move in the proximal-to-distal direction as a whole under the action of the barb 230. At the same time, the transmission part 2000 also transmits power between the inner tube seat 4000 and the outer tube seat 3000, so as to drive the outer tube seat 3000 to move in the distal-to-proximal direction, and then drive the outer tube 210 to move in the distal-to-proximal direction.

[0081] When the barb 230 extends out of the outer tube 210 and causes the barb 230 to separate from the medical stent 20, step S2 is performed: connect the outer tube seat 3000 with the guide rail 1100, and then drive the inner tube seat 4000 to move in the distal-to-proximal direction by the driving part 5000, so as to drive the inner tube 220 to move in the distal-to-proximal direction, so that the barb 230 returns to the outer tube 210 and passes through another part of the apertures of the medical stent 20.

[0082] Afterwards, step S1 and step S2 are repeatedly performed until the medical stent 20 is completely released.

[0083] Such a releasing process can compensate the axial shortening of the medical stent 20 caused by radial expansion during the retracting process of the outer tube 210 (i.e. the movement of the outer tube 210 in the direction from distal end to proximal end), improve the positioning accuracy when the medical stent 20 is released, and thus improve the treatment effect. The reciprocating axial movement of the inner tube 220 can utilize the barbs 230 to pull the medical stent 20 in the distal end direction section by section, so that the medical stent 20 is in a tensioned state during the releasing process, reduces the releasing resistance, and improves the releasing fluency of the medical stent 20.

[0084] In the embodiment of the present application, the guide rail 1100 is provided with a plurality of first limiting portions 1110 arranged at intervals in the axial direction. The transmission seat 1200 comprises a second limiting portion 1210, the second limiting portion 1210 is selectively connected with one of the first limiting portions 1110, and the second limiting portion 1210 is used for one-way limiting of the transmission seat 1200, so that the transmission seat 1200 can move in the direction from distal end to proximal end on the guide rail 1100, but cannot move in the direction from proximal end to distal end. The outer tube seat 3000 comprises a third limiting portion 3100, when the third limiting portion 3100 is selectively connected with one of the first limiting portions 1110, the outer tube seat 3000 is connected with the guide rail 1100, and at least prevents the outer tube seat 3000 from moving in the direction from distal end to proximal end relative to the guide rail 1100, when the third limiting portion 3100 is disconnected with the first limiting portion 1110, the outer tube seat 3000 is disconnected with the guide rail 1100, so as to allow the outer tube seat 3000 to move relative to the guide rail 1100.

[0085] Next, the components of the handle 100 and the assembly relationship are further described herein. Those skilled in the art can understand that the following is only an introduction to one optional structure of the handle 100, but this is not the only structure, and should not constitute undue limitation on the present application.

[0086] Please refer to Figure 4The guide rails 1100 extend along the axial direction of the handle 100. The number of the guide rails 1100 can be two. Each of the guide rails 1100 can be a circular-arc-shaped sheet structure. The concave surfaces of the two guide rails 1100 are arranged towards the axis of the handle 100 (i.e., the concave surfaces of the two guide rails 1100 are oppositely arranged). Further, the base 1000 further comprises a holding portion 1300 and an end cover 1400. The holding portion 1300 and the end cover 1400 are respectively connected to the axial two ends of the guide rails 1100. For example, in the embodiment, the holding portion 1300 is connected to the distal end of the guide rails 1100, and the end cover 1400 is connected to the proximal end of the guide rails 1100. By arranging the holding portion 1300 and the end cover 1400, the two guide rails 1100 can be kept relatively static, and the holding portion 1300 can also be held by the user when the delivery device 10 is used. In addition, as shown in Figure 4 and Figure 5 The first limiting portion 1110 can be a limiting groove, for example, in a rectangular shape.

[0087] As shown in Figure 6 to Figure 8 The transmission seat 1200 further comprises a first seat body 1220. The first seat body 1220 can be a hollow cylindrical structure, i.e., the first seat body 1220 has a first inner cavity 1221 extending through the axial direction. The guide rails 1100 pass through the first inner cavity 1221, and the outer surface of each of the guide rails 1100 abuts against the cavity wall of the first inner cavity 1221. The "outer surface of the guide rail 1100" refers to the surface of the guide rail 1100 away from the axis of the handle 100, i.e., the convex surface of each of the guide rails 1100. The second limiting portion 1210 is connected to the first seat body 1220. The number of the second limiting portion 1210 is two. The two second limiting portions 1210 are equidistantly arranged in the circumferential direction of the first seat body 1220, so that each of the second limiting portions 1210 is used to connect to the first limiting portion 1110 on one of the guide rails 1100. The purpose of such an arrangement is to improve the force stability of the transmission seat 1200 when moving along the guide rails 1100, so that it moves more smoothly.

[0088] Optionally, please refer to Figure 8The second limiting part 1210 comprises a first clasp. The first clasp comprises a first clasp head 1211 selectively inserted into one of the limiting grooves (i.e. the first limiting part 1110). In the embodiment, the first clasp head 1211 is a one-way limiting mechanism. In detail, the first clasp further preferably comprises a connecting part, which can be referred to as a first connecting part 1212, connected to the first seat body 1220. The first clasp head 1211 comprises a straight plane 1211a perpendicular to the axis of the handle 100 and a first inclined plane 1211b located at the proximal end side of the straight plane 1212a, and the distance of the first inclined plane 1211b to the straight plane 1211a gradually increases in the direction away from the axis of the handle 100.

[0089] Please refer to Figure 6 The first seat body 1220 is further provided with a first through groove 1222, a second through groove 1223 and a third through groove 1224, which respectively communicate with the first inner cavity 1221. The first through groove 1222 is used to provide space for the connection of the transmission part 2000 and the outer tube seat 3000, the second through groove 1223 is used to provide space for the connection of the transmission part 2000 and the inner tube seat 4000, and the third through groove 1224 is used to provide space for the connection of the third limiting part 3100 and the first limiting part 1110.

[0090] Further, please continue to refer to Figure 6 The transmission seat 1200 further comprises a mounting plate 1230 arranged on the cavity wall of the first inner cavity 1221 and dividing the first inner cavity 1221 into two sub-inner cavities through in the axial direction, and each of the sub-inner cavities is for one of the guide rails 1100 to pass through.

[0091] The transmission part 2000 is partially arranged on the mounting plate 1230. Please refer to Figure 9 and Figure 10The transmission part 2000 comprises a center shaft 2100, a gear unit 2200, a first rack 2300 and a second rack 2400. The center shaft 2100 is arranged on the mounting plate 1230, the gear unit 2200 is sleeved on the center shaft 2100 and can rotate around the center shaft 2100. The first rack 2300 and the second rack 2400 are arranged on opposite sides of the gear unit 2200 respectively, and the first rack 2300 and the second rack 2400 are engaged with the gear unit 2200. The first rack 2300 is further connected with the outer tube seat 3000, and the second rack 2400 is further connected with the inner tube seat 4000.

[0092] Preferably, the gear unit 2200 comprises a first gear 2210 and a second gear 2220, which are configured to remain circumferentially opposite static to make the first gear 2210 and the second gear 2220 rotate synchronously. The first gear 2210 is engaged with the second rack 2400, and the second gear 2220 is engaged with the first rack 2300. By engaging two gears with two racks respectively, the gear ratio of the transmission part 2000 can be adjusted by replacing the gears according to actual conditions, thereby adjusting the ratio of the distance that the inner tube seat 4000 drives the inner tube 220 to move from the proximal end to the distal end and the distance that the outer tube seat 3000 drives the outer tube 210 to move from the distal end to the proximal end, thereby adapting to different medical stents 20. For example, when the ratio of the axial length of the medical stent 20 in the compressed state to the axial length of the medical stent 20 in the natural state is 2:1, the gear ratio of the transmission part 2000 is preferably 1:1, so that the diameters of the pitch circles of the first gear 2210 and the second gear 2220 are 1:1, and when the ratio of the axial length of the medical stent 20 in the compressed state to the axial length of the medical stent 20 in the natural state is 3:1, the gear ratio of the transmission part 2000 is preferably 2:1, i.e. the ratio of the diameters of the pitch circles of the first gear 2210 and the second gear 2220 is 2:1. In addition, it can be understood that for the case where the ratio of the axial length of the medical stent 20 in the compressed state to the axial length of the medical stent 20 in the natural state is 2:1, the gear unit can also only comprise one gear, and this gear is engaged with the first rack and the second rack at the same time (not shown in the figure).

[0093] In addition, the first gear 2210 and the second gear 2220 can be kept circumferentially relatively static in various manners, for example, the gear unit 2200 further comprises a circumferential limiting member 2230, the circumferential limiting member 2230 is in the shape of a cross, and the center of the circumferential limiting member 2230 has a circular first mounting through hole, the circumferential limiting member 2230 is sleeved on the central shaft 2100 through the first mounting through hole. The center of the first gear 2210 is formed as a second mounting through hole in the shape of a cross, the first gear 2210 is sleeved on the circumferential limiting member 2230 through the second mounting through hole, and the center of the second gear 2220 is formed as a third mounting through hole in the shape of a cross, the first gear 2220 is sleeved on the circumferential limiting member 2230 through the third mounting through hole.

[0094] Please refer to Figure 11 to Figure 14 , the outer tube seat 3000 further comprises a second seat body 3200, the second seat body 3200 can also be a hollow cylindrical structure, which has an axially through second inner cavity 3201, the second seat body 3200 is sleeved on the first seat body 1220 of the transmission seat 1200 through the second inner cavity 3201, and the second seat body 3200 is connected with the first rack 2300 of the transmission part 2000 at the first through slot 1222. Specifically, please refer to Figure 11 and Figure 12 , and combine Figure 9 , Figure 10 , Figure 17 and Figure 19 , the inner wall of the second seat body 3200 is provided with a mounting block 3210, the mounting block 3210 is provided correspondingly with the first through slot 1222, and the mounting block 3210 is provided with a clamping groove 3211. The first rack 2300 has opposite first and second surfaces, the first surface is provided with teeth engaged with the gear unit 2200, and the second surface is provided with a protruding block (not shown in the figure), the protruding block is inserted into the clamping groove 3211.

[0095] Please refer to Figure 11 , Figure 13 and Figure 14The third limiting part 3100 is connected to the second seat body 3200. Optionally, the third limiting part 3100 comprises a second buckle 3110, which comprises a second clamping head 3111. When the second clamping head 3111 is selectively inserted into one of the limiting grooves, the outer tube seat 3000 is connected to the guide rail 1100. When the second clamping head 3111 is separated from the limiting groove, the outer tube seat 3000 is disconnected from the guide rail 1100. In this embodiment, the second clamping head 3111 can be a one-way limiting mechanism or a two-way limiting mechanism. When the second clamping head 3111 is a one-way limiting mechanism, if the second clamping head 3111 is selectively inserted into one of the limiting grooves, it only prevents the outer tube seat 3000 from moving from the distal end to the proximal end relative to the guide rail 1100. When the second clamping head 3111 is a two-way limiting mechanism, if the second clamping head 3111 is selectively inserted into one of the limiting grooves, it prevents the outer tube seat 3000 from moving from the distal end to the proximal end and from the proximal end to the distal end relative to the guide rail 1100.

[0096] Please refer to Figs. 13 and Figure 14 The second seat body 3200 is provided with a mounting groove 3202 in communication with the second inner cavity 3201. The mounting groove 3202 is in communication with the third through groove 1224, so that the mounting groove 3202 is in communication with the first inner cavity 1221. The number of mounting grooves 3202 is two, and each mounting groove 3202 is used to mount one third limiting part 3100.

[0097] Please refer to Figure 13 The second buckle 3110 further comprises a connecting part, which can be referred to as a second connecting part 3112. The second connecting part 3112 is rotatably connected to the mounting groove 3202 through a pin shaft 3120, and the second connecting part 3112 has a first free end 3112a and a second free end 3112b opposite in the axial direction. The first free end 3112a is provided with the second clamping head 3111 on the inner surface (i.e., the surface close to the axis of the handle 100). Figure 14 The third limiting part 3100 further comprises a first elastic member 3130. One end of the first elastic member 3130 is connected to the second seat body 3200, and the other end is connected to the second free end 3112b of the second connecting part 3112, so that the second free end 3112b of the second connecting part 3112 protrudes radially from the mounting groove 3202, and the second clamping head 3111 is inserted into one of the limiting grooves.

[0098] Optionally, the first elastic member 3130 is in a straight configuration in a natural state, and when one end of the first elastic member 3130 is connected to the second seat body 3200 and the other end of the first elastic member 3130 has not yet connected to the second free end 3112b of the second connecting portion 3112, the other end of the first elastic member 3130 extends along a tangent direction of the second seat body 3200. In this way, when the other end of the first elastic member 3130 is connected to the second free end 3112b of the second connecting portion 3112, the second free end 3112b of the second connecting portion 3112 can be made to be raised and protrude from the mounting groove 3202, and at the same time, the first elastic member 3130 is also bent under the action of the second connecting portion 3112. The first elastic member 3130 can be a spring, or a wire-like structure or a sheet-like structure with elasticity, and the present embodiment is not particularly limited in this regard.

[0099] When the second free end 3112b of the second connecting portion 3112 is subjected to a radial force directed towards the axis direction of the handle 100 (i.e. from outside to inside), so that the second connecting portion 3112 rotates around the pin shaft 3120, and the second free end 3112b of the second connecting portion 3112 moves in a direction close to the axis of the handle 100, the degree of protrusion of the second free end 3112b of the second connecting portion 3112 from the mounting groove 3202 decreases. Under the action of the lever principle, the first free end 3112a of the second connecting portion 3112 moves in a direction away from the axis of the handle 100 with the rotation of the second connecting portion 3112, and further drives the second clamping head 3111 to disengage from the limiting groove, so as to release the connection between the outer tube seat 3000 and the guide rail 1100. At the same time, the first elastic member 3130 stores elastic potential energy. When the radial force is cancelled, the first elastic member 3130 releases the elastic potential energy and drives the second connecting portion 3112 to rotate in the opposite direction around the pin shaft 3120, so that the second free end 3112b moves in a direction away from the axis of the handle 100 to the initial position, and at the same time, the first free end 3112b of the second connecting portion 3112 moves in a direction close to the axis of the handle 100, so as to make the second clamping head 3111 re-engage in one of the limiting grooves.

[0100] In the present embodiment, the radial force can be provided by the inner tube seat 4000, which will be described in detail later.

[0101] Further, the second seat body 3200 is provided with a fourth through slot 3203 in communication with the second inner cavity 3201, the fourth through slot 3203 being in communication with the second through slot 1223 to serve as a connecting channel of the inner tube seat 4000 and the second rack 2400 of the transmission part 2000. In addition, the outer tube seat 3000 is provided with an outer tube connecting piece 3300 connected to the second seat body 3200 and used for connecting with the outer tube 210.

[0102] Please refer to Figure 16 The inner tube seat 4000 comprises a third seat body 4100 having an axially through third inner cavity 4101 and sleeved on at least part of the outer surface of the second seat body 3200 of the outer tube seat 3000, and the third seat body 4100 also covers at least part of the outer surface of the first seat body 1220. The second rack 2400 of the transmission part 2000 can partially pass through the second through slot 1223 and the fourth through slot 3203 and be connected with the third seat body 4100. Optionally, the third seat body 4100 is further provided with an inner tube connecting piece 4200 used for connecting with the inner tube 220.

[0103] The third seat body 4100 is provided with a fifth through slot 4102 in communication with the third inner cavity 4101, the fifth through slot 4102 being in communication with the mounting slot 3202. When the second clamping head 3111 is inserted into one of the limiting slots, the second free end 3112b of the second connecting part 3112 also protrudes radially from the fifth through slot 4102. It can be understood that the number of the fifth through slots 4102 is two, and each of the fifth through slots 4102 is in communication with one of the mounting slots 3202.

[0104] Please refer to Figure 16 The fifth through slot 4102 has a first side 4102a and a second side 4102b opposite in the circumferential direction of the base 1000. Please refer to Figure 18 in combination with Figure 19 and Figure 20The inner tube seat 4000 further comprises the pressing plate 4300, which is configured to provide the radial force to the second free end 3112b of the second buckle 3110. Specifically, the pressing plate 4300 is arranged at the first side 4102a of the fifth through slot 4102. The inner tube seat 4000 further comprises a second elastic member 4400, one end of which is connected with the pressing plate 4300, and the other end of which spans the fifth through slot 4102 and is connected with the third seat body 4100. The pressing plate 4300 is configured to move in the direction from the first side 4102a to the second side 4102b, so that the pressing plate 4300 is pressed against at least part of the outer surface of the second connecting portion 3112 and exerts the radial force on the second free end 3112b of the second connecting portion 3112, and the second elastic member 4400 stores elastic potential energy. When the second elastic member 4400 releases the elastic potential energy, the pressing plate 4300 can be driven by the elastic potential energy released by the second elastic member 4400 to move in the direction from the second side 4102b to the first side 4102a, and stop exerting the radial force on the second free end 3112b of the second connecting portion 3112. The second elastic member 4400 can be a spring or a spring sheet, and the number thereof can be two.

[0105] Please continue to refer to Figure 18 to Figure 20 The outer surface of the pressing plate 4300 (i.e. the surface of the pressing plate 4300 away from the axis of the handle 100) is provided with a linear guide groove 4301, and the extension direction of the guide groove 4301 is perpendicular to the axis of the handle 100. The inner tube seat 4000 further comprises a guide mechanism 4500, one end of which is located at the second side 4102b of the second through slot 4102 and connected with the third seat body 4100. The other end of the guide mechanism 4500 extends in a direction perpendicular to the axis of the handle 100 and spans the fifth through slot 4102. The guide mechanism 4500 is partially accommodated in the guide groove 4301. In this way, the pressing plate 4300 can move linearly in the direction from the first side 4102a to the second side 4102b or in the direction from the second side 4102b to the first side 4102a under the cooperation of the guide groove 4301 and the guide mechanism 4500, and the pressing plate 4300 and the third seat body 4100 remain axially stationary relative to each other.

[0106] Preferably, please refer to Figure 15 At least part of the outer surface of the second connecting portion 3112 (i.e. the surface of the second connecting portion 3112 away from the axis of the handle 100) is a second inclined surface 3112c. Please refer to Figure 20, the edge of the second inclined surface 3112c close to the first side 4102a of the fifth through slot 4102 is flush with the outer surface of the third seat body 4100, or is located inside the fifth through slot 4102. The edge of the second inclined surface 3112c close to the second side 4102b of the fifth through slot 4102 protrudes radially from the fifth through slot 4102. In this way, the pressing plate 4300 can be smoothly pressed against the outer surface of the second connecting portion 3112 and the radial force can be applied to the second free end 3112b of the second connecting portion 3112 when the pressing plate 4300 moves in the direction from the first side 4102a to the second side 4102b.

[0107] Further, the driving portion 5000 is arranged on the third seat body 4100, which is configured to not only drive the inner tube seat 4000 to move axially relative to the guide rail 1100, but also drive the pressing plate 4300 to move in the direction from the first side 4102a to the second side 4102b.

[0108] In detail, the third seat body 4100 comprises a first segment 4110 and a second segment 4120 connected axially, the first segment 4110 and the second segment 4120 are arranged in the direction from the distal end to the proximal end, and the outer diameter of the first segment 4110 is greater than that of the second segment 4120. A limiting portion 4103 is further arranged on the proximal end outer surface of the second segment 4120. The first segment 4110 is partially sleeved on the second seat body 3200, and the second segment 4120 is partially sleeved on the first seat body 1220.

[0109] Further, a third inclined surface 4302 is formed on the side of the pressing plate 4300 away from the fifth through slot 4102, and the distance from the third inclined surface 4302 to the fifth through slot 4102 gradually increases in the direction from the proximal end to the distal end.

[0110] Please refer to Figure 21 The driving portion 5000 comprises an operating mechanism 5100 and a third elastic member 5200. The operating mechanism 5100 can be a hollow cylindrical structure, and is sleeved on the third seat body 4100 of the inner tube seat 4000. The operating mechanism 5100 is configured to keep circumferential relative static with the third seat body 4100, and can move axially relative to the inner tube seat 4000. In an optional implementation, a limiting groove (not shown in the figure) is arranged on the inner surface of the operating mechanism 5100, and a limiting convex edge 4104 extending in the axial direction is arranged on the outer circumferential surface of the third seat body 4100 (as shown in FIG. 6). When the operating mechanism 5100 moves axially relative to the third seat body 4100, the limiting groove on the inner surface of the operating mechanism 5100 is matched with the limiting convex edge 4104 on the outer circumferential surface of the third seat body 4100, so that the operating mechanism 5100 and the third seat body 4100 keep circumferential relative static. Figure 16 and Figure 17), the limiting protrusion 4103 is inserted into the limiting groove, so that the operating mechanism 5100 and the third seat 4100 remain relatively stationary in the circumferential direction. Figure 21 A fourth inclined surface 5101 is formed on the inner surface of the operating mechanism 5100. The fourth inclined surface 5101 is inclined in the same direction as the third inclined surface 4302 and is configured to mate with the third inclined surface 4302. Furthermore, a retaining ring 5110 is formed on the operating mechanism 5100. The third elastic member 5200 is sleeved on the second segment 4120 of the third base 4100, and the proximal end of the third elastic member 5200 and the limiting portion 4103 jointly clamp the retaining ring 5110.

[0111] In addition, preferably, Figure 21 As shown, the operating mechanism 5100 is an assembled structure to facilitate assembly.

[0112] The following combination Figure 1 and Figure 10 The force and movement of the various components of the handle 100 during the execution of the aforementioned steps S1 and S2 are described. It can be understood that in the initial state, the second clamping head 3111 of the second buckle 3110 is inserted into one of the limiting grooves, thereby connecting the outer tube base 3000 to the guide rail 1100.

[0113] During step S1, the user applies a first external force directed from the proximal end to the distal end to the operating mechanism 5100, causing the operating mechanism 5100 to move in a proximal-to-distal direction on the third base 4100. Simultaneously, because the fourth inclined surface 5101 of the operating mechanism 5100 at least partially abuts the third inclined surface 4302 of the pressing plate 4300, the operating mechanism 5100 applies a force directed from the first side 4102a to the second side 4102b to the pressing plate 4300, forcing the pressing plate 4300 to move in a direction from the first side 4102a to the second side 4102b. Furthermore, the operating mechanism 5100 applies a radial force from the outside to the inside to the second free end 3112b of the second connecting portion 3112 of the second buckle 3110, causing the second clamping head 3111 to disengage from the limiting groove. This releases the outer tube base 3000 from the guide rail 1100, and the second elastic member 4400 stores elastic potential energy. During this process, the retaining ring 5110 moves away from the limiting portion 4103 and presses against the third elastic member 5200 , so that the third elastic member 5200 stores elastic potential energy.

[0114] Afterwards, the user continues to apply the first external force to the operating mechanism 5100. At this time, the operating mechanism 5100 continuously applies the force from the first side 4102a to the second side 4102b to the third inclined surface 4302, so that the second elastic member 4400 keeps the elastic potential energy, and the retaining ring 5110 continuously presses against the third elastic member 5200, so that the third elastic member 5200 keeps the elastic potential energy. At the same time, the operating mechanism 5100 drives the entire inner tube seat 4000 to move in the proximal-to-distal direction, and the inner tube seat 4000 drives the second rack 2400 to move in the proximal-to-distal direction. And, since the second limiting portion 1210 unidirectionally limits the transmission seat 1200, the transmission seat 1200 cannot move in the proximal-to-distal direction, so the transmission seat 1200 keeps relatively static with the guide rail 1100, which makes the second rack 2400 apply a force to the first gear 2210 in the proximal-to-distal direction, and drives the first gear 2210 to rotate in the clockwise direction, thereby driving the second gear 2220 to rotate synchronously. Thus, the second gear 2220 applies a force to the first rack 2300 in the distal-to-proximal direction, and drives the first rack 2300 to move in the distal-to-proximal direction, and drives the outer tube seat 3000 to move in the distal-to-proximal direction.

[0115] When performing the step S2, first cancel the first external force, then the third elastic member 5200 releases the elastic potential energy, and drives the operating mechanism 5100 to move uniformly in the distal-to-proximal direction. In this process, the operating mechanism 5100 no longer applies the force from the first side 4102a to the second side 4102b to the third inclined surface 4302, so that the second elastic member 4400 releases the elastic potential energy to drive the pressing plate 4300 to move in the direction from the second side 4102b to the first side 4102a, and the second clamping head 3111 of the second clamping buckle 3110 reinserts into a limiting groove, so that the outer tube seat 3000 is connected with the guide rail 1100.

[0116] Then, a second external force is applied to the operation mechanism 5100 in a direction from the distal end to the proximal end, so that the operation mechanism 5100 moves in a direction from the distal end to the proximal end, and the blocking ring 5110 applies a force in a direction from the distal end to the proximal end to the limiting portion 4103 by compressing the third elastic member 5200, so as to drive the inner tube seat 4000 to move in a direction from the distal end to the proximal end, and the inner tube seat 4000 drives the second rack 2400 to move in a direction from the distal end to the proximal end, while the second rack 2400 is subjected to a friction force in a direction from the proximal end to the distal end. Correspondingly, the first gear 2210 is subjected to a friction force in a direction from the distal end to the proximal end, and since the first gear 2210 rotates synchronously with the second gear 2220, the second gear 2220 is also subjected to a friction force in a direction from the distal end to the proximal end. Since the transmission seat 1200 can move in a direction from the distal end to the proximal end, the gear unit 2200 also drives the transmission seat 1200 to move in a direction from the distal end to the proximal end. In this process, due to the meshing of the second gear 2220 and the first rack 2300, the first rack 2300 is subjected to a friction force in a direction from the distal end to the proximal end and tends to move from the distal end to the proximal end, but since the outer tube seat 3000 is connected with the guide rail 1100, the outer tube seat 3000 cannot move in a direction from the distal end to the proximal end, so that the first rack 2300 cannot move in a direction from the distal end to the proximal end and remains relatively static with the guide rail 1100.

[0117] Further, as shown in Figure 2 the present application provides the delivery device 10 as described above. In addition, the delivery device 10 further comprises a guide head 300 arranged at the distal end of the inner tube 220.

[0118] Further, the present application also provides a medical system, which comprises the delivery device 10 as described above and a medical implant, wherein the medical implant is provided with a plurality of apertures, at least part of the apertures are arranged along the axial direction of the medical implant; the catheter mechanism 200 is used for loading the medical implant, and the barb 230 is used for selectively inserting into part of the apertures. The medical implant is preferably a self-expandable medical stent 20.

[0119] Although the present application has been disclosed with reference to the above embodiments, it is not limited thereto. Those skilled in the art can make various modifications and variations to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and equivalent technologies thereof, the present application is also intended to include these modifications and variations.

Claims

1. A handle, characterized in that: include: A base, comprising a guide rail and a transmission seat arranged on the guide rail; A transmission part, arranged on the transmission seat; an outer tube seat connected to the transmission portion and also selectively connected to or disconnected from the guide rail; an inner pipe seat connected to the transmission part; and a driving portion configured to drive the inner tube seat to move axially relative to the guide rail; When the outer tube seat is disconnected from the guide rail and the driving unit drives the inner tube seat to move in the direction from the proximal end to the distal end, the transmission seat and the guide rail remain relatively stationary, and the transmission unit transmits power between the inner tube seat and the outer tube seat and drives the outer tube seat to move in the direction from the distal end to the proximal end; when the outer tube seat is connected to the guide rail and the driving unit drives the inner tube seat to move in the direction from the distal end to the proximal end, the outer tube seat and the guide rail remain relatively stationary, and the transmission unit transmits power between the inner tube seat and the transmission seat and drives the transmission seat to move in the direction from the distal end to the proximal end; The guide rail is provided with a plurality of first limiting portions spaced apart in the axial direction; the outer tube seat includes a third limiting portion. When the third limiting portion is selectively connected to one of the first limiting portions, the outer tube seat is connected to the guide rail and at least prevents the outer tube seat from moving in a distal-to-proximal direction relative to the guide rail. When the third limiting portion is disengaged from the first limiting portion, the outer tube seat is disconnected from the guide rail and is allowed to move relative to the guide rail. The transmission seat also includes a first seat body, which has an axially penetrating first inner cavity for the guide rail to pass through; the first seat body is also provided with a first through groove, a second through groove and a third through groove, the first through groove, the second through groove and the third through groove are respectively connected to the first inner cavity, wherein the first through groove is used to provide space for the connection between the transmission part and the outer tube seat, the second through groove is used to provide space for the connection between the transmission part and the inner tube seat, and the third through groove is used to provide space for the connection between the third limiting part and the first limiting part.

2. The handle according to claim 1, characterized in that The transmission seat includes a second limiting portion, which is selectively connected to one of the first limiting portions to allow the transmission seat to move from the distal end to the proximal end and prevent the transmission seat from moving from the proximal end to the distal end.

3. The handle according to claim 2, characterized in that The first limiting portion is a limiting groove; the second limiting portion includes a first buckle, the first buckle includes a first clamping head, and the first clamping head is selectively inserted into one of the limiting grooves.

4. The handle according to claim 3, characterized in that The first chuck includes a straight plane and a first inclined plane, the straight plane is perpendicular to the axis of the handle, the first inclined plane is located on the proximal side of the straight plane, and the distance from the first inclined plane to the straight plane gradually decreases along the direction close to the axis of the handle.

5. The handle according to claim 2, characterized in that There are two guide rails, which are arranged in parallel; the wall of the first inner cavity abuts against the outer surface of the guide rail; the second limiting parts are connected to the first seat body, and there are two of them, which are arranged at equal intervals in the circumferential direction of the first seat body, and each second limiting part is used to connect with the first limiting part on one of the guide rails.

6. The handle according to claim 5, characterized in that The transmission seat also includes a mounting plate, which is arranged on the wall of the first inner cavity and divides the first inner cavity into two sub-chambers that are axially connected, and each sub-chamber is for one guide rail to pass through; the transmission part is arranged on the mounting plate.

7. The handle according to claim 1, characterized in that The base further includes a gripping portion and an end cover, one end of the guide rail is connected to the gripping portion, and the other end is connected to the end cover.

8. The handle according to claim 2, characterized in that The first limiting portion is a limiting groove; the outer tube seat further includes a second seat body, and the second seat body is connected to the transmission portion; the third limiting portion is provided on the second seat body and includes a second buckle, and the second buckle includes a second clamping head; When the second clamp is selectively inserted into one of the limiting grooves, the outer tube seat is connected to the guide rail; when the second clamp is disengaged from the limiting groove, the outer tube seat is disconnected from the guide rail.

9. The handle according to claim 8, characterized in that The second limiting portion is connected to the first seat body; the second seat body has a second inner cavity that is axially continuous, and the second seat body is provided with a fourth through-groove that is in communication with the second inner cavity; the inner tube seat includes a third seat body, and the third seat body has a third inner cavity that is axially continuous; The second base is sleeved on a portion of the outer circumference of the first base, and the fourth through-groove is connected to the second through-groove; the third base is sleeved on at least a portion of the outer circumference of the second base, and also covers a portion of the outer circumference of the first base; The second seat is connected to the transmission part at the first through-groove; the third seat is connected to the transmission part at the second through-groove and the fourth through-groove; the second clamping head of the second buckle passes through the third through-groove to be inserted into one of the limiting grooves.

10. The handle according to claim 9, characterized in that The second seat body is provided with a mounting groove, and the mounting groove is communicated with the third through-groove; the second clip includes a connecting portion, which is rotatably arranged at the mounting groove and has a first free end and a second free end opposite to each other in the axial direction; the second clamp head is arranged on the first free end of the connecting portion; the third limiting portion further includes a first elastic member, one end of the first elastic member is connected to the second seat body, and the other end is connected to the second free end of the connecting portion, so that the second free end of the connecting portion protrudes from the mounting groove in the radial direction, and the second clamp head is inserted into one of the limiting grooves; When the second free end of the connecting part is subjected to a radial force directed toward the axis of the handle, the connecting part rotates to disengage the second clamp from the limiting groove and allow the first elastic member to store elastic potential energy. When the radial force is canceled, the first elastic member releases the elastic potential energy.

11. The handle according to claim 10, characterized in that The third seat body is provided with a fifth through-groove communicating with the third inner cavity, the fifth through-groove communicating with the mounting groove, the fifth through-groove having a first side and a second side opposite to each other in the circumferential direction; the inner tube seat further comprises a pressing plate and a second elastic member, the pressing plate being arranged on the first side of the fifth through-groove, one end of the second elastic member being connected to the pressing plate, and the other end spanning the fifth through-groove and connected to the third seat body; When the second clamp is inserted into one of the limiting grooves, the second free end of the connecting portion further protrudes radially from the fifth through groove; The pressure plate is used to move along the first side toward the second side, and press against at least a portion of the outer surface of the connecting portion, and apply the radial force to the second free end of the connecting portion, and cause the second elastic member to store elastic potential energy. When the second elastic member releases the elastic potential energy, the pressure plate is driven to move along the second side toward the first side, and stops applying the radial force to the second free end of the connecting portion.

12. The handle according to claim 11, characterized in that A linear guide groove is provided on the outer surface of the pressure plate, and the extension direction of the guide groove is perpendicular to the axis of the handle; the inner tube seat also includes a guide mechanism, which is a linear configuration, one end of the guide mechanism is located on the second side of the fifth through-groove and is connected to the third seat body, and the other end of the guide mechanism extends in a direction perpendicular to the axis of the handle and crosses the fifth through-groove, and the guide mechanism is partially accommodated in the guide groove.

13. The handle according to claim 12, characterized in that At least part of the outer surface of the connecting portion is a second inclined surface, the edge of the second inclined surface close to the first side of the fifth through-groove is flush with the outer surface of the third seat body, or is located inside the fifth through-groove, and the edge of the second inclined surface close to the second side of the fifth through-groove protrudes radially from the fifth through-groove.

14. The handle according to claim 11, wherein The driving portion is disposed on the third base and is further configured to drive the pressing plate to move along a direction from the first side to the second side.

15. The handle according to claim 14, characterized in that The third seat body includes a first segment and a second segment provided at the proximal end of the first segment, wherein the outer diameter of the second segment is smaller than the outer diameter of the first segment, and the proximal end of the second segment is further provided with a limit portion; a third inclined surface is formed on the side of the pressure plate away from the fifth through-groove, and the distance from the third inclined surface to the fifth through-groove gradually increases from the proximal end to the distal end; The driving portion includes an operating mechanism and a third elastic member, the operating mechanism is sleeved on the third seat body, and is configured to remain circumferentially relatively stationary with the third seat body, and can move axially relative to the third seat body; a fourth inclined surface is also formed on the inner surface of the operating mechanism, the inclination direction of the fourth inclined surface is the same as the inclination direction of the third inclined surface, and the fourth inclined surface is at least partially in contact with the third inclined surface; a retaining ring is also formed on the operating mechanism; the third elastic member is arranged on the second segment, and the proximal end of the third elastic member and the limiting portion jointly clamp the retaining ring.

16. The handle according to any one of claims 1 to 15, characterized in that The transmission part includes a central shaft, a gear unit, a first rack and a second rack; the central shaft is arranged on the transmission base, the gear unit is sleeved on the central shaft, the first rack and the second rack are respectively arranged on opposite sides of the gear unit, and the first rack and the second rack are both engaged with the gear unit; the first rack is also connected to the outer tube base, and the second rack is also connected to the inner tube base.

17. The handle according to claim 16, characterized in that The gear unit includes a first gear and a second gear, both of which are sleeved on the central shaft, and the first gear and the second gear are configured to remain relatively stationary in the circumferential direction; the first gear is engaged with the second rack, and the second gear is engaged with the first rack.

18. A conveying device, characterized in that: It comprises a catheter mechanism and a handle as described in any one of claims 1 to 17; the catheter mechanism comprises an inner tube, a barb and an outer tube, the proximal end of the inner tube is connected to the inner tube seat, one end of the barb is connected to the outer circumferential surface of the distal end of the inner tube, and the other end is a third free end, and the third free end faces the distal end of the inner tube; the outer tube is partially sleeved on the outer circumferential surface of the inner tube, and the proximal end of the outer tube is connected to the outer tube seat.

19. A medical system, characterized in that: It comprises a medical implant and a delivery device as claimed in claim 18; the medical implant is provided with a plurality of pores, at least some of the pores are arranged along the axial direction of the medical implant; the catheter mechanism is used to load the medical implant, and the barbs are used to selectively insert into some of the pores.

20. The medical system according to claim 19, wherein: The medical implant is a self-expanding medical stent.

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