A conveyor handle and conveyor system therefor

Abstract

The present application relates to a kind of conveyor handle and its conveying system, for conveying blood vessel stent, comprising: support rod, with inner cavity and along longitudinal axis extends;Three-way joint, at least partially disposed in the inner cavity of the support rod, the three-way joint has branch pipe and is provided with first transmission thread at the distal end periphery;Push rod, proximal end passes through the inner cavity of the support rod and is fixed in the three-way joint;Adjusting knob, rotation is clamped in the periphery of the support rod, with second transmission thread meshing with first transmission thread;Rotating the adjusting knob can drive the push rod to move along longitudinal axis.This conveyor handle can be driven by operating adjusting knob to move support rod along longitudinal axis in sheath, in turn eliminate the gap between push rod and stent, prevent sheath from bending at gap.

Description

TECHNICAL FIELD

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

[0002] During an interventional procedure, a delivery handle is usually used to deliver a medical device such as a stent to a lesion site in a blood vessel for treating a stenosis or an aneurysm or a dissection. During the delivery of the stent, the stent is usually mounted in a sheath of the delivery handle, and the stent is in a compressed and constrained state. When the sheath is retracted at the predetermined site, the stent is released from the sheath and expands to anchor at the predetermined site.

[0003] Referring to Figure 1 As shown in the figure, a push rod 2 is arranged inside the sheath 1 to enhance the structural strength of the sheath, and a stent 3 is mounted in the sheath 1 at a position distal to the push rod. Since the length of the push rod 2 cannot be changed, when the stent 3 is assembled in the sheath, a gap G exists between the push rod 2 and the stent 3 due to manufacturing tolerances or different lengths of different specifications of the stent. The gap G constitutes a cavitation gap, and the structure of the sheath is weakest at the cavitation gap G without the stent and the push rod, which constitutes a weak section. During the delivery, the sheath is prone to bending at the weak section, which may result in damage to the sheath or failure to continue to push forward. SUMMARY

[0004] Therefore, it is necessary to provide a delivery handle for delivering a stent, which comprises a support rod having an inner cavity and extending along a longitudinal axis, a tee joint arranged at least partially in the inner cavity of the support rod, the tee joint having a branch pipe and a first transmission thread arranged on the outer periphery of the distal end, a push rod having a proximal end fixed in the tee joint after passing through the inner cavity of the support rod, and an adjusting knob rotatably clamped on the outer periphery of the support rod and having a second transmission thread engaged with the first transmission thread. Rotation of the adjusting knob can drive the push rod to move along the longitudinal axis.

[0005] Further, a stent top sleeve is fixedly connected to the distal end of the push rod, and the stent top sleeve can be sleeved on the outer periphery of the stent.

[0006] Further, the stent top sleeve comprises a sleeve connecting portion arranged at the distal end and a push rod connecting portion arranged at the proximal end, the sleeve connecting portion can be sleeved on the outer periphery of the stent, the push rod connecting portion is fixedly connected with the push rod, and a first inner diameter of the sleeve connecting portion is larger than a second inner diameter of the push rod connecting portion.

[0007] Further, a plurality of limiting protrusions are arranged on the inner wall of the sleeve connecting portion in the circumferential direction, and the distal end of the bare coil of the stent can be hooked on the limiting protrusions.

[0008] Further, the first outer diameter of the sleeve joint is larger than the second outer diameter of the push rod connecting part, or the inner cavity of the sleeve joint is provided with a tapered structure gradually increasing from the proximal end to the distal end, and the minimum inner diameter of the tapered structure is larger than the second inner diameter of the push rod connecting part.

[0009] Further, the outer periphery of the push rod is provided with a radial extending exhaust through hole, and the exhaust through hole is at least partially aligned with the branch pipe inner cavity to communicate the branch pipe with the inner cavity of the push rod.

[0010] Further, the proximal end side of the support rod is further provided with a rear handle, the outer periphery of the proximal end side of the support rod is provided with a support rod limiting structure, the distal end side of the rear handle is provided with a rear handle limiting structure and a through sliding slot, the rear handle is sleeved outside the three-way joint, and the branch pipe is slidingly connected with the sliding slot, and the inner wall of the adjusting knob is provided with a first limiting structure and a second limiting structure at the distal end side and the proximal end side respectively, which are clamped with the support rod limiting structure and the rear handle limiting structure.

[0011] Further, the proximal end opening of the push rod is hermetically connected with a sealing element.

[0012] Further, the push rod is fixedly connected with the sealing element, or further comprising an elastic element arranged in the rear handle, the elastic element is in a compressed state, the distal end side of the elastic element abuts against the sealing element, and the proximal end side of the elastic element abuts against the rear handle.

[0013] Further, the outer periphery of the sealing element is provided with a sealing element flange, the bottom wall of the rear handle is provided with an elastic element limiting structure, the distal end of the elastic element abuts against the sealing element flange, and the proximal end of the elastic element is sleeved on the elastic element limiting structure.

[0014] Further, the sealing element flange is provided with an annular limiting structure, and the distal end side of the elastic element is clamped in the annular limiting structure.

[0015] The application also relates to a delivery system comprising the delivery handle, further comprising: a front handle, which is movably sleeved on the outer periphery of the support rod; and a sheath, which is movably arranged in the support rod and fixedly connected with the front handle, and the support rod is movably arranged in the sheath.

[0016] The technical scheme of the application has the following beneficial effects:

[0017] The delivery handle and the delivery system thereof can drive the push rod to move along the longitudinal axis by adjusting rotation, change the position of the push rod in the sheath, eliminate the gap between the stent and the push rod, prevent the sheath from being bent at the gap and damaged or unable to continue to be pushed along the blood vessel during the delivery process, and thus reduce the operation risk. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 This is a schematic diagram of the structure in the first embodiment where there is an installation gap between the push rod and the bracket;

[0019] Figure 2 This is a schematic diagram of the overall structure of the conveying system in the first embodiment;

[0020] Figure 3 This is a structural diagram of the support structure according to the first embodiment;

[0021] Figure 4 This is a structural diagram of the sheath core assembly according to the first embodiment;

[0022] Figure 5 The first embodiment Figure 2 Enlarged view of point A in the image;

[0023] Figure 6 A cross-sectional view of the conveyor handle of the first embodiment;

[0024] Figure 7A The first embodiment is a cross-sectional view of the top sleeve of the bracket along the longitudinal axis.

[0025] Figure 7B This is a cross-sectional view of the bracket top sleeve in the direction of the vertical longitudinal axis of the first embodiment;

[0026] Figure 8 The first embodiment Figure 6 Enlarged view of point A in the image;

[0027] Figure 9 This is a three-dimensional structural diagram of the tee connector according to the first embodiment;

[0028] Figure 10 This is a partial three-dimensional structural diagram of the support shaft in the first embodiment;

[0029] Figure 11A Left view of the rear handle in the first embodiment;

[0030] Figure 11B The first embodiment Figure 11A A sectional view along AA in the diagram;

[0031] Figure 12A This is a three-dimensional structural diagram of the adjustment knob in the first embodiment;

[0032] Figure 12B This is a front view of the adjustment knob in the first embodiment;

[0033] Figure 13 This is a cross-sectional view of the seal according to the first embodiment;

[0034] Figure 14A cross-sectional view of the stent top cover in the second embodiment;

[0035] Figure 15 A cross-sectional view of the stent top cover in the third embodiment; DETAILED DESCRIPTION

[0036] In order to make the above objectives, features and advantages of the present application more clear and comprehensible, specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. It will be apparent, however, to one skilled in the art that the present application can be practiced without some or all of these details. In other instances, well known process steps have not been described in detail in order to avoid unnecessarily obscuring the present application. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in this description, the singular forms "a", "an" and "the" include plural references unless the context clearly dictates otherwise. The term "and / or" includes any and all combinations of one or more of the associated listed items.

[0037] It is to be understood that where an element is referred to as being "on" or "connected to" another element, it can be directly on or connected to the other element or intervening elements can be present. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0038] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in this description, the singular forms "a", "an" and "the" include plural references unless the context clearly dictates otherwise. The term "and / or" includes any and all combinations of one or more of the associated listed items.

[0039] It is to be understood that where an element is referred to as being "on" or "connected to" another element, it can be directly on or connected to the other element or intervening elements can be present. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0040] First Embodiment

[0041] Reference will now be made to Figure 2As shown, the embodiment provides a delivery system 100, which comprises a delivery handle 300, the delivery handle 300 comprises a support rod 40, a rear handle 50 is arranged at the proximal end side of the support rod 40, and an adjusting knob 71 is arranged at the front of the rear handle 50 and the support rod 40. A front handle 30 is further arranged on the outer periphery of the support rod 40, and the front handle 30 is located at the distal end side of the delivery handle 300. The proximal end of a sheath tube 20 is slidably arranged in the support rod 40 and is fixedly connected with the front handle 30, and a sheath core assembly 10 is arranged at the distal end side of the sheath tube 20. A bracket 200 is compressed and bound at the distal end side of the sheath tube 20, the sheath core assembly 10 is used for anchoring the proximal end side of the bracket 200, and the bracket 200 is released by operating the front handle 30 to drive the sheath tube 20 to retreat. Wherein, the bracket 200 is compressed and loaded into the sheath tube 20, and the bracket 200 is tightly fitted with the inner wall of the sheath tube 20 due to the elastic recovery force. However, since the bracket 200 is compressed and does not deform into a regular circle, but an irregular polygon, there is still a gap between the bracket 200 and the local inner wall of the sheath tube 20.

[0042] Referring to Figure 3 As shown, the bracket in the embodiment comprises a bracket body 210, and the bracket body 210 has a proximal bare coil 220 at the proximal end side and a distal bare coil 230 at the distal end side. In other embodiments, only the proximal bare coil can be provided without the distal bare coil.

[0043] Referring to Figure 4 As shown, the structure of the sheath core assembly 10 is described. The sheath core assembly 10 comprises an inner sheath core 14 and an outer sheath core 13. A guide head 11 is fixedly connected to the distal end of the inner sheath core 14. The guide head 11 is also called a TIP head, which is used to guide the advancing direction of the sheath tube during delivery and prevent damage to the blood vessel wall. A plurality of fixing grooves (not marked in the figure) are formed on the outer surface of the proximal end of the guide head 11. The fixing grooves can be formed by fixing protrusions arranged at the end of the guide head 11 or directly formed by grooving. The outer sheath core 13 is slidably sleeved on the outer periphery of the inner sheath core 14, and the distal end of the outer sheath core 13 has an anchoring head 12. The anchoring head 121 comprises a plurality of anchoring columns arranged at intervals in the circumferential direction, so that the cross section of the anchoring head 12 is in the shape of a petal. The anchoring head 12 is used to cooperate with the proximal bare coil 220 of the bracket 100 to control the release of the proximal end of the bracket 200. Specifically, the outer core tube 13 slides axially relative to the guide head 11 in the direction close to the guide head 11, so that the plurality of anchoring columns are respectively embedded in the plurality of fixing grooves on the guide head 11, that is, the proximal bare coil 220, the anchoring head 12 and the guide head 11 are in a folded state, and the proximal end of the bracket 200 is bound at this time. When the outer core tube 13 slides axially relative to the guide head 11 in the direction away from the guide head 11, the anchoring head 12 can be separated from the guide head 11, at this time, the anchoring head 12 releases the binding of the proximal end of the bracket 200 to realize the release of the bracket.

[0044] Referring to Figure 5 The installation of the stent 200 in the delivery system 100 in the present embodiment is described. When the stent 200 is installed in the sheath 20, the stent 200 is constrained in the sheath 20, and the proximal end side (the side closer to the heart) of the stent 200 is constrained by the anchor head 12. By rotating the adjusting knob 71, the push rod 72 can be moved distally, and the push rod 72 can abut against the distal end of the stent 200, so that the gap between the push rod 72 and the stent 200 can be eliminated. In addition, in order to completely eliminate the gap between the push rod 72 and the stent 200 and eliminate the existence of the weak area of the sheath, in the present embodiment, a stent top sleeve 73 is fixedly installed on the distal end side of the push rod 72, and as the push rod 72 moves distally to gradually approach the stent 200, the stent top sleeve 72 can be sleeved on the outer periphery of the stent 200. On the one hand, since the stent top sleeve 72 with a certain axial length is arranged at the end of the push rod 72, the distal end of the push rod 72 does not need to abut against the end side of the stent 200 to eliminate the gap. Therefore, the arrangement of the stent top sleeve 72 reduces the necessary stroke of the push rod 72 and reduces the adjustment amount of the adjusting knob 71; on the other hand, since the stent top sleeve 72 can be sleeved on the outer periphery of the stent 200, the gap between the push rod 72 and the stent 200 can be completely eliminated, and the generation of the cavitation gap can be avoided. At this time, at least the stent top sleeve 72 exists between the distal end side of the stent 200 and the proximal end side of the push rod 22. The stent top sleeve 72 can enhance the strength of the sheath, and avoid bending of the weak area during pushing and causing damage to the sheath or failure of the operation.

[0045] Referring to Figure 6The structure of the conveyor handle 300 of the present embodiment is shown. The conveyor handle 300 has a support rod 40 with an inner cavity and extending along a longitudinal axis. The support rod 40 constitutes a support component of the entire conveying system 100 for supporting the front handle 30 and other components. A tee joint 74 is slidably arranged in the support rod 40, and the tee joint 74 can be externally connected to a hose 60. The hose 60 can be connected to a tee valve (not shown in the figure), through which the conveying system 100 can be vented by injecting a liquid (normal saline) into the hose, or the like can also be injected into the hose to be delivered to the target position in the human body through the sheath. A push rod 73 is fixed in the tee joint 74, and the proximal end of the push rod 73 passes through the inner cavity of the support rod 40 and is inserted into the inner cavity of the tee joint 74, and is fixedly connected with the tee joint 74. In the present embodiment, the fixed connection of the push rod 73 and the tee joint 74 is achieved by a push rod lock head 75. The push rod lock head 75 is a sleeve structure with an inner cavity, and an outer thread is arranged on the outer periphery of the push rod lock head 75, and the tee joint 74 is provided with an inner thread matched with the outer thread. The proximal end of the push rod 73 can be inserted into the inner cavity of the push rod lock head 75 and fixedly connected with the push rod lock head 75. The outer periphery of the push rod 73 and the inner wall of the push rod lock head 75 can be bonded with glue, or can be connected by heat melting or welding, or can be connected by interference or clamping. By fixedly inserting the push rod 73 into the push rod lock head 75, and then fixedly connecting the push rod lock head 75 and the tee joint 74 by screwing, the fixed connection of the push rod 73 and the tee joint 74 is achieved. In other embodiments, the fixed connection of the push rod 73 and the tee joint 74 can also be achieved by bonding, heat melting, interference or clamping without the push rod lock head 75. A rear handle 50 is also arranged at the proximal end side of the support rod 40, and the rear handle 50 is sleeved on the proximal end side of the tee joint 74, so that the tee joint 74, the push rod 73 and the push rod lock head 75 are located in the cavity formed by the rear handle 50 and the support rod 40, and the push rod 73 can move along the longitudinal axis in the cavity.

[0046] Referring to Figure 7A-7BAs shown, the structure of the stent top sleeve 73 in the present embodiment is described. The stent top sleeve 73 is a sleeve structure with a hollow, including a sleeve part 731 arranged at the distal end side and a push rod connecting part 732 arranged at the proximal end part. The sleeve part 731 is used to be sleeved on the outer periphery of the stent 200 to be connected with the stent 200, and the push rod connecting part 732 is used to be connected with the push rod 72. The sleeve part 731 has a first inner diameter d1 and a first outer diameter D1, and the push rod connecting part 732 has a first inner diameter d2 and a second outer diameter D2. In the present embodiment, the first inner diameter d1 is greater than the second inner diameter d2, and the first outer diameter D1 is equal to the second outer diameter D2, so that the wall thickness of the sleeve part 731 is smaller than the wall thickness of the push rod connecting part 732, which is beneficial to the sleeve part 731 to extend into the gap between the stent 200 and the inner wall of the sheath 20 and then be sleeved on the outer periphery of the stent 200. In addition, since the inner diameter of the sleeve part 731 is not equal to the inner diameter of the push rod connecting part 732, a top sleeve step 733 is formed at the connection between the two. A plurality of limiting protrusions 731 are arranged on the inner wall of the proximal end side of the stent top sleeve 73 in the circumferential direction. The limiting protrusion 731 is a smooth curved protrusion structure, when the distal end of the stent 200 is restrained in the stent top sleeve 73, at least one wave crest in the distal end side bare coil 230 of the stent 200 will be clamped with the limiting protrusion 731. At this time, for the stent 200, the proximal end side bare coil 220 is anchored on the anchor head 12, and the distal end side bare coil 230 is clamped in the stent top sleeve 73, so that both ends of the stent 200 are limited, so that the stent 200 can be kept at a predetermined position during delivery and release, and the controllability of the stent 200 during release and the position accuracy after release can be improved. In the present embodiment, the stent top sleeve 73 is made of LDPE material to ensure the flexibility of the delivery system and prevent the flexibility of the entire sheath 20 from being greatly reduced due to the arrangement of the stent top sleeve 73.

[0047] Referring to Figure 8 As shown, the stent top sleeve 73 can be fixedly connected with the distal end of the push rod 73 by glue bonding or other physical or chemical means. The distal end side of the push rod 72 has a necked part 722, and the outer diameter of the necked part 722 is smaller than the outer diameter of other parts of the push rod 72, so that a step is formed at the distal end of the necked part 722.

[0048] When the support top sleeve 73 is connected to the push rod 72, the support top sleeve 73 is fitted onto the outer periphery of the constricted neck 722, and the proximal end of the top sleeve step 732 abuts against the end step of the constricted neck 722 to achieve axial positioning of the support top sleeve 73. The outer diameter of the support top sleeve 73 is equal to the outer diameter of the push rod 72, while the outer diameter of the push rod 72 is slightly smaller than the inner diameter of the sheath 20. In this embodiment, "slightly smaller" means that the size of one component is less than 5mm smaller than the size of another component. For example, when the inner diameter of the sheath 20 is 6.2mm, the outer diameter of the push rod 72 is 5.9mm. Since the outer diameter of the push rod 72 is only slightly smaller than that of the sheath 20, when the outer diameter of the support top sleeve 73 is equal to that of the push rod 72, the gap between the outer periphery of the support top sleeve 73 and the inner wall of the sheath 20 is very small. Therefore, the support top sleeve 73, with a wall thickness smaller than that of the push rod, can more easily extend into the gap between the support 200 and the sheath 20 and thus be smoothly fitted onto the outer periphery of the support 200.

[0049] See Figure 9 The structure of the tee connector 74 is described below. The tee connector 74 includes a main pipe 742 and a branch pipe 741 communicating with the main pipe 742. A first transmission thread 7422 is provided on the outer periphery of the side of the main pipe 741 away from the branch pipe 741. A first limiting member 7421 and a second limiting member 7423 are respectively provided at the distal and proximal ends of the first transmission thread 7422. The first limiting member 7421 and the second limiting member 7423 are used to limit the adjustment knob 71 screwed on the first transmission thread 7422. When the adjustment knob 71 moves to the position of the first limiting member 7421, the first limiting member 7421 will abut against the adjustment knob 71 and prevent it from moving further to the distal end; similarly, when the adjustment knob 71 moves to the position of the second limiting member 7423, the second limiting member 7423 will abut against the adjustment knob 71 and prevent it from moving further to the proximal end.

[0050] See Figure 10 The structure of the support rod 40 is described below. The support rod 40 is a hollow rod-shaped structure extending along the longitudinal axis. A support rod limiting structure 41 is provided on the outer periphery of the proximal end of the support rod 40. In this embodiment, the support rod limiting structure is a limiting groove structure, which is used to engage with the adjustment knob 71. A support rod external thread 42 is also provided on the outer periphery of the support rod 40 located at the distal end of the support rod limiting structure 41. The external thread 42 is used to cooperate with the front handle 30 to adjust the position of the front handle 30 on the support rod 40.

[0051] See Figure 11A-11BThe structure of the rear handle 50 is shown. The rear handle 50 is a sleeve structure with an inner cavity, and the distal end is an open end. A rear handle limiting structure 54 is provided on the outer periphery of the distal end. In this embodiment, the rear handle limiting structure is a groove structure. In this embodiment, the rear handle limiting structure 54 is composed of protrusions provided at both ends thereof, and the rear handle limiting structure 54 is formed between the two protrusions. In other embodiments, the rear handle limiting structure 54 can also be formed by inwardly recessing the outer periphery of the distal end. In addition, a sliding groove 53 is also provided on the distal end of the rear handle 50. Referring to Figure 11A The sliding groove 53 is a through groove that penetrates the wall of the rear handle 50 in the radial direction, so that the inner cavity is in communication with the outside. The sliding groove 53 extends axially proximally from the distal end face of the rear handle 50 for a certain length, and the specific length is determined by the movement stroke of the tee joint 74. Referring to Figure 6 The rear handle 50 is sleeved on the outer periphery of the tee joint 74, and the branch pipe 741 of the tee joint 74 can extend out of the inner cavity of the rear handle 50 through the sliding groove 53. Considering that the tee joint 74 needs to slide in the rear handle 50, the sliding groove 53 is provided as an elongated slot structure extending along the axis for a certain length. The sliding groove 53 limits the circumferential freedom of the branch pipe 741 (cannot rotate circumferentially or can only rotate a small angle) so that the branch pipe 741 can slide axially in the sliding groove 53 and cannot rotate circumferentially at will, thereby ensuring that the tee joint 74 can move axially when the adjustment knob 71 rotates. In other embodiments, other limiting structures can be provided on the tee joint to limit its circumferential freedom to prevent it from rotating with the adjustment knob. For example, a limiting protrusion can be provided on the tee joint, and a limiting groove extending axially is provided in the support rod to slidingly engage with the limiting protrusion. In addition, an elastic member limiting structure 51 is also provided on the inner cavity bottom wall of the rear handle 50 on the proximal side, and a through hole 52 is also provided on the bottom wall to penetrate the bottom wall, and the through hole 52 is used for the inner sheath core 14 and the outer sheath core 13 to pass through. Exemplarily, Figure 11B The elastic member limiting structure 51 in is a protrusion structure. In other embodiments, the elastic member limiting structure can also be provided as a groove structure, and the distal end of the elastic member is inserted into the groove to achieve positioning of the elastic member.

[0052] Referring to Figure 12A-12B The structure of the adjustment knob 71 is shown. The adjustment knob 71 is a cylindrical structure with a cavity inside, and first and second limiting structures 712 and 713 are provided on the inner wall at both ends thereof. A second transmission thread 711 is also provided on the inner wall of the adjustment knob 71 between the first and second limiting structures 712 and 713, and the second transmission thread 711 is used to engage with the first transmission thread 7421 on the tee joint 74 to form a screw pair. Exemplarily, referring to Figure 12AAs shown, the first limiting structure 712 and the second limiting structure 713 in the embodiment are both protruding structures. In other embodiments, the first limiting structure 712 and the second limiting structure 713 can also be both groove structures, or one is a protruding structure and the other is a groove structure. In addition, in order to facilitate connection and installation, the adjustment knob 71 is divided into two parts, which are spliced by the buckle 714.

[0053] Continuing to refer to Figure 6 As shown, the adjustment knob 71 is connected between the support rod 40 and the rear handle 50, thereby connecting the support rod 40 and the rear handle 50. Specifically, the first limiting structure 712 on the distal side of the adjustment knob 71 is clamped in the support rod limiting structure 41 arranged in the circumferential direction of the support rod 40, and the second limiting structure 713 on the proximal side of the adjustment knob 71 is clamped in the rear handle limiting structure 54 arranged in the circumferential direction of the rear handle 50. The limiting protrusion can slide in the limiting groove in the circumferential direction and cannot move along the longitudinal axis, so that the adjustment knob 71 can rotate relative to the support rod 40 and the rear handle around the longitudinal axis and cannot move in the longitudinal direction. The adjustment knob 71 is engaged with the tee joint 74, and the two constitute a threaded pair. Since the adjustment knob 71 can only rotate around the longitudinal axis and cannot move, by rotating the adjustment knob 71, the tee joint 74 can be driven to move in the longitudinal direction towards the distal end or the proximal end, thereby driving the push rod 72 fixedly connected thereto to move in the longitudinal direction, so as to adjust the distance between the push rod 72 and the bracket 200 and eliminate the gap therebetween.

[0054] In other embodiments, the rear handle 50 can also not be provided, and the adjustment knob 71 is only clamped with the proximal side of the support rod 40. At this time, the tee joint 74 can also be driven to move in the longitudinal direction by rotating the adjustment knob 71.

[0055] The protruding and groove structures provided on the adjustment knob 71, the middle shaft 72 and the rear handle 50 can be interchanged, as long as the three can be clamped and rotated around the longitudinal axis after cooperation. For example, in other embodiments, the distal side of the support rod 40 is provided with a protruding structure in the outer periphery, and / or the distal side of the rear handle 50 is provided with a protruding structure in the outer periphery, which are clamped with the first limiting structure and the second limiting structure on both ends of the adjustment knob 71, respectively.

[0056] Referring to Figure 6 , 13 As shown, the proximal side of the push rod 72 is connected with a sealing element 76 for sealing the proximal opening thereof. In the embodiment, the sealing element 76 is a sleeve-shaped structure with an opening at one end, which is sleeved on the outer periphery of the proximal side opening of the push rod 72. The distal side of the sealing element 76 is provided with a sealing element flange 761, and the sealing element flange 761 is provided with an annular limiting structure 763 facing the proximal side. Exemplarily, Figure 13The annular limiting structure 763 in the sealing member 76 is a ring groove structure, and in other embodiments, can also be an annular protruding structure. In addition, a sealing through hole 762 is formed in the end wall of the sealing member 76 on the proximal end side. The sealing through hole 762 is used for the outer core tube 13 to pass through, and is in interference fit with the outer core tube 13 to seal the outer core tube 13. The distal end side of the elastic member 77 is sleeved on the outer periphery of the sealing member 76 and abuts against the sealing member flange 761, and is clamped in the annular limiting structure 763; the proximal end side of the elastic member 77 is sleeved on the elastic member limiting structure 51, that is, the elastic member limiting structure 51 is inserted into the proximal end side of the elastic member 77. Through the above arrangement, the two ends of the elastic member 77 are positioned to prevent the elastic member 77 from loosening or bending during deformation.

[0057] In this embodiment, the elastic member 77 is always in a compressed state, thereby applying an elastic force to the sealing member 76, so that the sealing member 76 is tightly attached to the proximal end side of the push rod 73. Considering that the movement of the push rod 72 will drive the sealing member 76 to move together, in order to ensure the sealing effect of the sealing member 76 and prevent the sealing member 76 from being loosely connected with the push rod 73 to affect the sealing effect, the elastic member 77 is provided in this embodiment to construct a follow-up structure to ensure that the sealing member 76 can move together with the push rod 72. The follow-up structure of this embodiment refers to a component in the structure that moves together with another component. During the entire movement process of the push rod 73, the distal end of the elastic member 77 always abuts against and applies pressure to the sealing member 76, thereby ensuring that the sealing member 76 is tightly sleeved on the outer periphery of the proximal end opening of the push rod 72 and ensuring its sealing performance. The sealing member 76 is arranged to seal the proximal end opening of the push rod 72, which can prevent blood from entering the push rod 72 from the distal end opening and leaking out of the proximal end opening during the operation process, thereby preventing blood leakage.

[0058] Considering that the sealing member 76 is arranged at the proximal end opening of the push rod 72, in order to realize the exhaust operation of the delivery system 100, an exhaust through hole 721 is arranged on the outer periphery of the proximal end side of the push rod 72, which penetrates the tube wall of the push rod 72 to communicate the inner cavity thereof with the outside. When the push rod 72 is assembled in the tee joint 74, the exhaust through hole 721 is aligned with the inner cavity of the branch pipe 741 to communicate the branch pipe 741 with the inner cavity of the push rod 72. In this way, the liquid (such as normal saline) delivered through the hose 60 can directly enter the push rod 72 through the exhaust through hole 721, and continue to advance to the sheath tube 20 along the push rod 72, thereby realizing the exhaust of air in the push rod 72 and the sheath tube 20.

[0059] In other embodiments, the follow-up structure composed of the above-mentioned elastic member and the like can not be arranged, but the sealing member 77 can be directly fixedly connected with the push rod 73. The specific fixed connection manner can be glue bonding, hot melting or welding, etc.

[0060] When the stent 200 is loaded in the sheath 20, the distance between the push rod 72 and the stent 200 can be adjusted by rotating the adjusting knob 71, so that the distal end side of the stent 200 enters the stent top sleeve 73, thereby eliminating the gap between the stent 200 and the push rod 72. At this time, the wave crest in the distal end side bare wave coil 230 of the stent 200 will hook on the limiting protrusion 731 in the stent top sleeve 73, and both ends of the stent 200 are limited. When the sheath 20 reaches the predetermined position of the human body, first, the adjusting knob 71 is adjusted so that the stent top sleeve 73 is separated from the stent 200. During the separation process, due to the existence of the limiting protrusion 731, the stent top sleeve 73 will exert a proximal pulling force on the stent 200, which will pull the distal end side of the stent 200, thereby stretching the stent 200 to a certain extent, thereby adjusting the position of the distal end side of the stent 200, eliminating the shortening or local folding of the stent 200. When the pulling force is greater than a certain value, due to the fact that the limiting protrusion 731 is a curved smooth protrusion, the distal end side bare wave coil 230 is separated from the limiting protrusion 731, and as the stent top sleeve 73 continues to move proximally relative to the stent 200, the two will be separated. Then adjust the front handle 30 to make the sheath 200 retreat, so that the stent gradually exposes and expands from the sheath 200 to gradually release. Finally, operate the outer core tube 13 to separate the anchor head 121 from the guide head 11, thereby releasing the proximal end of the stent 200, and then achieving the complete release of the stent 200 at the target position of the human body blood vessel.

[0061] Second embodiment

[0062] The delivery handle in this embodiment is basically the same as that in the previous embodiments, and the only difference is that the structure of the stent top sleeve is different.

[0063] Referring to Figure 14 As shown, the stent top sleeve 73a in this embodiment includes a sleeve joint portion 731a provided at the distal end side and a push rod connecting portion 732a at the proximal end side, which are basically the same as the stent top sleeve in the first embodiment. Different from the first embodiment, a transition portion 734a is further provided at the connection between the sleeve joint portion 731a and the push rod connecting portion 732a. The transition portion 734a is a tapered structure, so that the first outer diameter D1 of the sleeve joint portion 731a is larger than the second outer diameter D2 of the push rod connecting portion 732a. Through the above arrangement, under the premise that the second outer diameter D2 is equal to the outer diameter of the push rod 72, the outer diameter of the sleeve joint portion 731a is larger than the outer diameter of the push rod 72, so that the outer wall of the sleeve joint portion 731a is closer to the inner wall of the sheath 200, so as to reduce the gap between the sleeve joint portion 731a and the inner wall of the sheath 200. Through the above arrangement, the stent top sleeve 73a can more conveniently extend into the gap between the stent and the sheath and then be sleeved on the outer periphery of the stent.

[0064] Third embodiment

[0065] The handle of the delivery device in this embodiment is basically the same as that in the previous embodiments, and the only difference is the structure of the top sleeve of the support. Referring to Figure 15 As shown, the top sleeve 73b of the support in this embodiment is basically the same as that in the first embodiment, and includes a sleeve joint 731b at the distal end side and a push rod connecting part 732b at the proximal end side. Different from the first embodiment, the inner cavity of the sleeve joint 731b in this embodiment is a tapered structure with a smaller proximal end and a larger distal end, so that the inner cavity of the sleeve joint 731b is formed in a trumpet shape. The trumpet shape design makes the wall thickness of the sleeve joint 731b gradually decrease from the proximal end to the distal end, until it reaches the minimum at the free end, so that the sleeve joint 731b can be easily inserted into the gap between the support 200 and the sheath 20, and then sleeved on the outer periphery of the support 200.

[0066] In other embodiments, a plurality of guide pieces are arranged on the distal end side of the sleeve joint, and the guide pieces are arranged at intervals along the circumference of the sleeve joint, and the thickness of the guide pieces gradually increases from the distal end to the proximal end. Since the guide pieces can be easily inserted into the gap between the support and the sheath, the sleeve joint can be guided to smoothly enter the gap between the support 200 and the sheath 20, thereby improving the assembly efficiency.

[0067] The above embodiments only express several embodiments of the present application, and the description is more specific and detailed, but it cannot be understood as a limitation on the scope of the patent. It should be noted that for ordinary skilled persons in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are all within the scope of the present application. The protection scope of the present application should be subject to the appended claims.

Claims

1. A delivery handle for delivering vascular stents, characterized in that, The application relates to a support rod for a blood vessel stent, which comprises the following parts: a support rod with an inner cavity and extending along a longitudinal axis; a three-way joint arranged at least partially in the inner cavity of the support rod, the three-way joint having a branch pipe and a first transmission thread arranged on the outer periphery of the distal end of the three-way joint; a push rod with a proximal end fixed in the three-way joint after penetrating through the inner cavity of the support rod; an adjusting knob rotatably clamped on the outer periphery of the support rod, the adjusting knob having a second transmission thread engaged with the first transmission thread, and the adjusting knob can drive the push rod to move along the longitudinal axis when the adjusting knob is rotated; a stent top sleeve fixedly connected to the distal end of the push rod, the stent top sleeve being sleeved on the outer periphery of the blood vessel stent.

2. The conveyor handle of claim 1, wherein, The stent top sleeve comprises a sleeve joint part arranged on the distal end and a push rod connecting part arranged on the proximal end, the sleeve joint part is sleeved on the outer periphery of the blood vessel stent, the push rod connecting part is fixedly connected to the push rod, the first inner diameter of the sleeve joint part is larger than the second inner diameter of the push rod connecting part.

3. The conveyor handle of claim 2, wherein, The inner wall of the sleeve joint part is circumferentially provided with a plurality of limiting protrusions, and the distal end bare coil of the blood vessel stent can be hooked on the limiting protrusions.

4. The conveyor handle of claim 2, wherein, The first outer diameter of the sleeve joint part is larger than the second outer diameter of the push rod connecting part, or the inner cavity of the sleeve joint part is arranged as a taper structure gradually increasing from the proximal end to the distal end, and the minimum inner diameter of the taper structure is larger than the second inner diameter of the push rod connecting part.

5. The conveyor handle of claim 1, wherein, The outer periphery of the push rod is provided with a radial exhaust through hole, the exhaust through hole is at least partially aligned with the inner cavity of the branch pipe to communicate the branch pipe with the inner cavity of the push rod.

6. The conveyor handle of claim 1, wherein, The proximal end of the support rod is further provided with a rear handle, the proximal end of the support rod is provided with a support rod limiting structure on the outer periphery, the distal end of the rear handle is provided with a rear handle limiting structure and a through sliding slot, the rear handle is sleeved on the outer side of the three-way joint, the branch pipe is slidably connected with the sliding slot, and the distal end and the proximal end of the inner wall of the adjusting knob are respectively provided with a first limiting structure and a second limiting structure clamped with the support rod limiting structure and the rear handle limiting structure.

7. The conveyor handle of claim 6, wherein, The proximal end opening of the push rod is hermetically connected with a sealing element.

8. The conveyor handle of claim 7, wherein, The push rod is fixedly connected with the sealing element, or further comprising an elastic element arranged in the rear handle, the elastic element is in a compressed state, the distal end of the elastic element abuts against the sealing element, and the proximal end of the elastic element abuts against the rear handle.

9. The conveyor handle of claim 8, wherein, The outer periphery of the sealing element is provided with a sealing element flange, the bottom wall of the rear handle is provided with an elastic element limiting structure, the distal end of the elastic element abuts against the sealing element flange, and the proximal end of the elastic element is sleeved on the elastic element limiting structure.

10. The conveyor handle of claim 9, wherein, The sealing element flange is provided with an annular limiting structure, and the distal end of the elastic element is clamped in the annular limiting structure.

11. A delivery system comprising the delivery handle of any one of claims 1-10, wherein, Further comprising: a front handle movably sleeved on the outer periphery of the support rod; a sheath tube, the proximal end of the sheath tube is slidably penetrated in the support rod and fixedly connected with the front handle, and the support rod is slidably penetrated in the sheath tube.

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