CN217660313U

CN217660313U - Stent delivery device

Info

Publication number: CN217660313U
Application number: CN202220304499.5U
Authority: CN
Inventors: 曹时凯; 陈豪
Original assignee: Hangzhou Wei Qiang Medical Technology Co ltd
Current assignee: Hangzhou Wei Qiang Medical Technology Co ltd
Priority date: 2022-02-15
Filing date: 2022-02-15
Publication date: 2022-10-28
Anticipated expiration: 2032-02-15

Abstract

The utility model provides a support conveying device relates to medical instrument technical field, and support conveying device is used for releasing the support in the blood vessel, and support conveying device includes interior sheath core subassembly and outer sheath core subassembly. The inner sheath core assembly comprises a guiding head, the outer sheath core assembly comprises a moving piece and a limiting piece which are connected, the moving piece is connected to the guiding head in a sliding mode to drive the limiting piece to move at least in the direction from the near end to the far end of the guiding head, the limiting piece restrains the far end of the support, the restrained position is located in the guiding head, the moving piece can slide in the direction from the near end to the far end of the guiding head to release the far end of the support at the position close to the far end of the guiding head, and the support expands in the radial direction. The moving part of the bracket conveying device and the binding position of the far end of the bracket are both positioned between the near end and the far end of the moving part, so that the length of the guide head is reduced to a great extent, the guide head can smoothly pass through the bending parts such as the aortic arch, and the bent vascular wall is not easily damaged.

Description

Stent delivery device

Technical Field

The utility model relates to the technical field of medical equipment, especially, relate to a support conveyor.

Background

Aortic aneurysm has gradually become the important disease that influences the life health of people in China, the annual incidence rate of aortic dissection aneurysm is 5-10 people/10 ten thousand population, the incidence of aortic dissection is urgent, the progression is fast, the fatality rate is very high, if not diagnosed and treated in time, the fatality rate of patients increases by 1% per hour within 48 hours, and reaches 70% at 1 week. The treatment mode of the aortic aneurysm mainly comprises surgical open operation treatment and interventional therapy, wherein the surgical open operation refers to abdominal or thoracic opening, mobile aneurysm excision and artificial blood vessel replacement, which are traditional treatment methods, large surgical trauma, high risk and higher requirements on the physical condition of a patient. Interventional therapy is also called intracavity repair, a covered stent is implanted in an aorta through arterial puncture or small incision to isolate a tumor cavity and reconstruct a blood flow path in situ, and the covered stent has the characteristics of small wound and quick recovery because the thoracotomy and abdominal opening are not needed.

Compared with the release after no stent, the selection of the release after the stent is covered with the membrane can correct the displacement of the stent in the stent release process, prevent the stent from shortening, improve the accuracy of the stent release and improve the probability of successful operation. Before the stent is completely released, the release rod locks, and when the stent is completely released, the release rod moves towards the direction far away from the fixing head so as to completely unlock the stent, and the stent is automatically expanded and fixed in the blood vessel after being unbound. However, before unlocking, the release frame is completely located outside the fixing head, and the release frame needs to be moved away from the fixing head to release the stent, so that the post-release part needs to be set to a long length, and the stent is difficult to pass through a bending part such as an aortic arch and is easy to damage the bent blood vessel wall.

SUMMERY OF THE UTILITY MODEL

In view of this, it is necessary to provide a stent delivery device which is difficult to pass through a curved portion such as an aortic arch, and which is likely to damage a curved vessel wall, in order to solve the problem that a long length is required to be provided in a post-release part of a conventional post-release device.

The utility model provides a support conveyor for release support is in the blood vessel, support conveyor includes:

an inner sheath core assembly comprising a guide head; and

the sheath core assembly comprises a movable member and a limiting member, the limiting member is provided with a free end and a connecting end, the connecting end is connected with the movable member, the movable member is connected with the guide head in a sliding mode to drive the limiting member to move at least along the direction from the near end to the far end of the guide head, the limiting member is configured in such a way that in the moving track of the limiting member relative to the guide head, the position close to the near end of the guide head enables the far end of the bracket to be bound between the free end and the connecting end under the state of radial compression, the position close to the far end of the guide head releases the far end of the bracket through the free end to enable the far end of the bracket to expand in the radial direction, and the position where the limiting member is bound to the far end of the bracket is located between the near end of the guide head and the far end of the guide head.

The movable piece of the bracket conveying device is connected with the guide head in a sliding mode, the position, bound by the limiting piece, of the far end of the bracket is located between the near end and the far end of the guide head, the movable piece slides from the near end of the guide head to the far end, and the position, bound of the far end of the bracket is also located between the near end and the far end of the guide head, so that the length of the guide head is reduced to a great extent, the guide head can smoothly pass through the bending parts such as an aortic arch, and the bent vascular wall is not easy to damage.

In one embodiment, the guide head comprises:

a fixed head;

the far end of the joint piece is connected with the near end of the fixed head, the maximum radial dimension of the joint piece is smaller than that of the fixed head, the movable piece is connected with the joint piece in a sliding mode, and the movable piece can slide towards the fixed head to drive the limiting piece to move towards the fixed head so as to release the support; and

the distal end of the positioning assembly is connected with the proximal end of the connecting piece, the maximum radial dimension of the positioning assembly is larger than that of the connecting piece, and when the moving piece moves towards the fixed head, the moving piece is far away from the positioning assembly.

In one embodiment, the connecting piece is provided with a sliding groove along an axial direction thereof, the movable member is at least partially arranged in the sliding groove, and the sliding groove is used for limiting the sliding direction of the movable member so that the movable member slides along the sliding groove in a direction away from the positioning assembly and close to the fixed head.

In one embodiment, the positioning element is provided with a first locking hole, part of the limiting element is inserted into the first locking hole, part of the limiting element is located at a position extending from a proximal end of the first locking hole, the extending position is used for binding a distal end of the bracket to the positioning element, and the limiting element can retract and/or disengage from the first locking hole under the driving of the movable element, so that the limiting element releases the distal end of the bracket.

In one embodiment, the positioning assembly comprises:

a connecting member; and

the second positioning element, the connecting piece connect in between second positioning element and the linking piece, second locking hole has been seted up to the second positioning element, the locating part wears to locate the second locking hole, the locating part is used for the constraint the position of support is located the distal side of second positioning element, the locating part can follow under the drive of moving part the second locking hole breaks away from.

In one embodiment, the number of the limiting members is multiple, the limiting members are arranged along the circumferential direction of the guide head, the distal ends of the limiting members are connected to the movable member, and the movable member can drive the limiting members to move simultaneously along the direction from the proximal end to the distal end of the guide head so as to release the bracket.

In one embodiment, two ends of the movable member in the radial direction respectively extend from the guide head, at least one of the limiting members is connected to one end of the movable member, and at least another one of the limiting members is connected to the other end of the movable member.

In one embodiment, the limiting member is movably connected to the moving member, and the outer sheath core assembly further includes a plurality of collars, and the collars are movably sleeved on the moving member and the limiting member.

In one embodiment, the inner sheath core assembly further comprises an inner sheath core tube, and the guide head is fixed on the inner sheath core tube;

the outer sheath core assembly further comprises an outer sheath core tube, the moving member is connected with the outer sheath core tube, the outer sheath core tube is slidably sleeved on the inner sheath core tube to drive the moving member to move towards the fixing head to slide, and the moving member drives the limiting member to move so as to unlock the support.

In one embodiment, the stent delivery device further comprises a first operating handle comprising:

a second housing;

the driving tooth block is fixedly connected to the outer sheath core tube, can slide towards the fixed head and is limited from rotating around the axial direction of the second shell; and

the release knob is connected to the second shell in a rotating mode around the axial direction of the second shell and in threaded connection with the driving toothed block, the release knob is configured to drive the driving toothed block to slide towards the guide head through rotating around the axial direction of the second shell and through matching with threads of the driving toothed block, and the driving toothed block drives the outer sheath core pipe to slide towards the fixing head.

In one embodiment, the second housing has a limiting groove along its axial direction, a part of the driving block is slidably connected to the limiting groove, so that the rotation of the driving block around the second housing in the axial direction is limited, and the part of the driving block slidably connected to the limiting groove passes through the limiting groove and is threadedly connected to the release knob.

In one embodiment, the inner sheath core assembly further comprises:

the distal end of the inner sheath core tube is fixedly connected with the head stop block, at least part of the head stop block protrudes out of the inner sheath core tube in the radial direction of the inner sheath core tube, and the inner sheath core tube is fixedly connected with the fixed head at least through the head stop block;

the tail stopper is fixedly connected with the inner sheath core pipe, and at least part of the tail stopper protrudes out of the inner sheath core pipe in the radial direction of the inner sheath core pipe; and

the tail guide head is connected with the inner sheath core tube and the tail stop block and fixedly connected with the second shell.

In one embodiment, the stent delivery device further comprises a sheath tube, the sheath tube is sleeved on at least part of the periphery of the outer sheath core assembly, and a containing cavity for containing a stent is formed between the sheath tube and the outer sheath core assembly.

In one embodiment, the stent delivery device further comprises a second operating handle, the second operating handle comprising:

the first shell is connected to the sheath tube in a sliding manner;

the adjusting sleeve is connected to the first shell in a rotating mode around the axial direction of the first shell; and

the sliding part is fixedly connected with the sheath pipe and is in threaded connection with the adjusting sleeve, the sliding part is configured to be limited around the axial rotation of the first shell, and the sliding part is matched with the threads of the adjusting sleeve to drive the sheath pipe to move when the adjusting sleeve rotates relative to the first shell.

In one embodiment, the second operating handle further comprises: the control switch is connected to the first shell, the adjusting sleeve is circumferentially provided with a clamping groove, and the control switch is configured to:

when the adjusting sleeve is clamped with the clamping groove, the adjusting sleeve can rotate relative to the first shell through clamping limit and the axial sliding of the adjusting sleeve relative to the first shell is limited, so that the adjusting sleeve drives the sliding piece to slide away from the guide head through thread matching;

when the adjusting sleeve is separated from the clamping groove, the limiting of the adjusting sleeve is released, so that the adjusting sleeve can slide along the direction far away from the first shell, and the sliding piece and the sheath tube are driven to be far away from the guide head.

In one embodiment, the stent conveying device further comprises a second housing fixedly connected to the first housing, the second housing is provided with a limit groove, the sliding part partially passes through the limit groove so that the sliding part is limited from rotating around the axial direction of the first housing, and the part of the sliding part passing through the limit groove is in threaded connection with the adjusting sleeve;

the adjusting sleeve is connected to the second shell in a sliding mode, and when the control switch is separated from the clamping groove, the adjusting sleeve can slide along the second shell to be far away from the first shell.

In one embodiment, the control switch comprises:

the base is fixedly connected to the first shell;

an elastic member; and

the control key is connected with the first shell in a sliding mode, the elastic piece is elastically connected between the control key and the base, and one end of the control key extends towards the adjusting sleeve to be provided with a buckling hook used for clamping the clamping groove.

Drawings

Fig. 1 is a schematic structural view of the stent conveying device of the present invention;

fig. 2 is a schematic structural view of a guide head of the stent delivery device of the present invention;

FIG. 3 is a schematic view of the full-section structure of the stent delivery device of the present invention;

FIG. 4 is an enlarged schematic view of the guide head of FIG. 3;

FIG. 5 is an enlarged schematic structural view of the second operating handle of FIG. 3;

FIG. 6 is an enlarged structural schematic view of the first operating handle of FIG. 3;

fig. 7 is a schematic structural view of a guide head when the stent is completely released by the stent delivery device of the present invention;

fig. 8 is a schematic structural diagram of the control switch of the present invention;

fig. 9 is a schematic structural view of an embodiment of the present invention in which the movable member is connected to the position-limiting member;

fig. 10 is a schematic structural view of another embodiment of the movable member and the position-limiting member according to the present invention.

In the drawings, the components represented by the respective reference numerals are listed below:

1. a stent delivery device;

10. a guide head; 11. a fixed head; 12. a joining member; 121. a chute; 13. a positioning assembly; 131. a first positioning member; 1311. a first locking hole; 132. a connecting member; 133. a second positioning member; 1331. a second locking hole; 134. a locking portion; 14. a limiting member; 140. a free end; 141. a connecting end; 15. an outer sheath core assembly; 151. a movable member; 152. sheath core pipe; 153. a collar; 16. an inner sheath core tube; 17. a head stopper;

20. a first operating handle; 21. releasing the knob; 22. a driving tooth block; 23. fixing a nut; 24. a second housing; 241. a first limit groove; 25. a tail stop block; 26. a tail guide head;

30. a second operating handle; 31. an adjustment sleeve; 311. a card slot; 32. a slider; 33. a first housing; 34. a control switch; 341. a control key; 342. an elastic member; 343. a base; 344. a fastening hook; 35. a sheath tube; 242. a second limit groove;

4. and (4) a bracket.

Detailed Description

In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments of the present invention are described in detail below with reference to the accompanying drawings. It is apparent that the specific details set forth in the following description are merely exemplary of the invention, which can be practiced in many other embodiments that depart from the specific details disclosed herein. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work all belong to the protection scope of the present invention.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.

Unless defined otherwise, 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 invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

For ease of description, "proximal" and "distal" are used, wherein "proximal" refers to the end closer to the operator and "distal" refers to the end further from the operator.

As shown in fig. 1 and 4, the utility model provides a stent conveying device 1 for loading in stent conveying device 1 after radially compressing stent 4, being conveyed to the vascular lesion by stent conveying device 1 and then releasing stent 4, stent 4 automatically recovers to the straight tubular shape and clings to the inner wall of the blood vessel through the elastic action, and the vascular lesion is isolated from the blood flow, thereby achieving the purpose of treatment. In the process of releasing the stent 4, the adjusting sleeve 31 is firstly rotated relative to the first shell 33, the adjusting sleeve 31 drives the sheath 35 to slide towards the proximal end of the stent delivery device 1, the sheath 35 is gradually separated from the stent 4, so that the non-distal part of the stent 4 is gradually expanded along the radial direction, at the moment, the stent 4 is not in contact with the blood vessel wall, the position of the stent 4 in the blood vessel can be observed and adjusted under the irradiation of X-rays, and the stent is in a half-release state. After the release position of the stent 4 is completely determined, the release knob 21 is rotated relative to the second shell 24, so that the distal end of the stent 4 is released, and the stent 4 is radially expanded and clings to the vessel wall, thereby completing the complete release of the stent 4.

The stent delivery device 1 includes an inner sheath core assembly and an outer sheath core assembly 15.

As shown in fig. 4, 5 and 6, the inner sheath core assembly includes a guide head 10, an inner sheath core tube 16, a head stopper 17, a tail stopper 25 and a tail guide head 26. Wherein the guide head 10 and the head stop 17 are disposed at the distal end of the inner sheath core tube 16, and the tail stop 25 and the tail guide head 26 are disposed at the proximal end of the inner sheath core tube 16. The distal end of inner sheath core tube 16 is fixedly connected to head stopper 17, head stopper 17 is at least partially projected from inner sheath core tube 16 in the radial direction of inner sheath core tube 16, and the projected portion of head stopper 17 is fixedly connected to fixing head 11. Tail stop 25 projects at least partially from inner sheath core tube 16 in the radial direction of inner sheath core tube 16, and tail guide head 26 connects inner sheath core tube 16 and tail stop 25. Through the arrangement, the inner sheath core tube 16 is completely fixed, and the problem that the inner sheath core tube 16 slides to influence the release of the stent 4 in the process of releasing the stent 4 is avoided.

As shown in fig. 2 and 4, the outer sheath core assembly 15 includes a movable member 151 and a limiting member 14, which are connected, for example, the limiting member 14 may be completely fixedly connected to the movable member 151, where the fixed connection means that the movable member 151 can drive the limiting member 14 to move when moving, and more specifically, the movable member 151 can drive the limiting member 14 to move from the proximal end of the guide head 10 to the distal end when moving from the proximal end of the guide head 10 to the distal end. The movable member 151 is slidably connected to the guide head 10, and the movable member 151 can drive the limiting member 14 to move from the proximal end of the guide head 10 toward the distal end. The limiting member 14 is configured to constrain the distal end of the holder 4 in a radially compressed state at a position close to the proximal end of the guide head 10 in a trajectory along which the limiting member moves along the guide head 10, the position at which the limiting member 14 constrains the distal end of the holder 4 being between the proximal end of the guide head 10 and the distal end of the guide head 10. When the movable element 151 slides from the proximal end of the guide head 10 to the distal end, the movable element 151 can release the distal end of the stent 4 at a position close to the distal end of the guide head 10, so that the distal end of the stent 4 can expand in the radial direction, and the stent 4 is completely released and tightly attached to the inner wall of the blood vessel to treat the lesion of the blood vessel.

In one embodiment, the outer sheath core assembly 15 is slidably connected to the guide head 10, for example, a sliding slot may be formed on the guide head 10, and the outer sheath core assembly 15 is slidably connected to the guide head 10 through the sliding slot. The outer sheath core assembly 15 includes a movable element 151 and a limiting element 14, the limiting element 14 has a free end 140 and a connecting end 141, the connecting end 141 is fixedly connected to the movable element 151, the bracket can be sleeved on the limiting element 14 through the free end 140, the position where the bracket is sleeved on the limiting element 14 is located between the free end 140 and the connecting end 141, and similarly, the bracket can also slide down from the limiting element 14 through the free end 140. When the stent is sleeved in the limiting member 14, the limiting member 14 can radially constrain the stent, and after the stent slides down from the limiting member 14, the limiting member 14 no longer constrains the stent, and the stent can radially expand.

As shown in fig. 9, the connection position of the connection end 141 of the stopper 14 and the movable element 151 is not limited, for example, the connection position is located inside the guide head 10. Specifically, the distal end of the movable member 151 is straight, the distal end of the position limiting member 14 is L-shaped, and the connecting end 141 of the position limiting member 14 is connected to the movable member 151 inside the guide head 10. The distal end of the retaining member 14 may be made of a hard material, such as metal, to maintain the shape of the distal end of the retaining member 14.

As shown in fig. 10, the connecting end 141 of the limiting member 14 is connected to the movable member 151 at a position outside the guide head 10. Specifically, the distal end of the movable element 151 is T-shaped, the distal end of the movable element 151 extends out of the guide head 10, the distal end of the position limiting element 14 is straight rod-shaped, and the connecting end 141 of the position limiting element 14 and the movable element 151 are connected at a position outside the guide head 10. The distal end of the position-limiting member 14 can be made of hard material or soft material, so that the moving member 151 drives the position-limiting member 14 to move when the moving member 151 slides relative to the guide head 10.

Since the position of the limit stop 14 constrained to the distal end of the bracket 4 is between the proximal end and the distal end of the guide head 10, and the movable element 151 slides from the proximal end of the guide head 10 toward the distal end, it is equivalent to the movable element 151 sliding inside the guide head 10. In addition, the position of the limit piece 14 for restricting the far end of the bracket 4 is also between the near end and the far end of the guide head 10, so that the length of the guide head 10 is greatly reduced, the guide head 10 can smoothly pass through a bending part such as an aortic arch, and the bent blood vessel wall is not easy to damage.

As shown in fig. 2, in one embodiment, the guide head 10 includes a fixing head 11, an engaging member 12, and a positioning assembly 13. The distal end of the joint member 12 is connected with the proximal end of the fixing head 11, the proximal end of the joint member 12 is connected with the distal end of the positioning assembly 13, and the maximum radial dimension of the joint member 12 is smaller than the maximum radial dimension of the fixing head 11 and smaller than the maximum radial dimension of the positioning assembly 13. The movable member 151 is slidably connected to the connecting member 12, and the movable member 151 can slide toward the fixed head 11 to drive the limiting member 14 to move toward the fixed head 11, so as to release the distal end of the bracket 4. The movable member 151 gradually moves away from the positioning member 13 while moving toward the fixed head 11.

As shown in fig. 2, there are many structures for slidably connecting the movable member 151 and the connecting member 12, for example, the movable member 151 is sleeved on the outer wall of the connecting member 12, or a sliding groove 121 is formed in the connecting member 12, and the movable member 151 is slidably connected to the connecting member 12 through the sliding groove 121. In the present embodiment, the linking member 12 is provided with a sliding groove 121 along an axial direction thereof, the movable element 151 is at least partially disposed in the sliding groove 121, and the sliding groove 121 is used for limiting a sliding direction of the movable element 151, so that the movable element 151 can stably slide along the sliding groove 121 toward a direction away from the positioning assembly 13 and close to the fixed head 11. The middle portion of the movable element 151 is disposed in the sliding groove 121, two ends of the movable element 151 radially extend from the sliding groove 121 along the guide head 10, and the extended portions of the two ends of the movable element 151 are used for connecting the limiting member 14.

As shown in fig. 2 and fig. 4, in an embodiment, the positioning component 13 is provided with a first locking hole 1311, a part of the limiting component 14 is inserted into the first locking hole 1311, and a part of the limiting component 14 is located outside the first locking hole 1311, specifically, a free end of the limiting component 14 can be inserted into the first locking hole 1311, and further extends from a proximal end of the first locking hole 1311, the extended portion is used for constraining a distal end of the bracket to the positioning component 13, that is, a part of the limiting component 14 located outside the first locking hole 1311 is used for constraining a distal end of the bracket 4 to the positioning component 13, the limiting component 14 can be retracted into the first locking hole 1311 under the driving of the moving component 151, so that the limiting component 14 releases the distal end of the bracket 4, or the limiting component 14 can be retracted into the first locking hole 1311 and separated from the first locking hole 1311 under the driving of the moving component 151, so that the limiting component 14 releases the distal end of the bracket 4. For example, the connecting end 141 of the limiting member 14 is fixedly connected to the movable member 151, and the limiting member 14 extends in a direction parallel to the axial direction of the guide head 10, so that the free end 140 of the limiting member 14 is in an extended state, when the bracket is sleeved in the limiting member, the bracket generates a radially outward force on the limiting member 14, and after the limiting member 14 passes through the first locking hole 1311, the first locking hole 1311 can provide a radially inward force for the limiting member 14, so as to prevent the limiting member 14 from excessively deforming outward in the radial direction, and prevent the bracket from disengaging from the limiting member 14. Of course, in the embodiment shown in fig. 2, even if the connection end 141 of the limiting member 14 is not fixedly connected to the movable member 151, after the limiting member 14 is inserted into the first locking hole 1311, the first locking hole 1311 prevents the limiting member 14 from deforming radially outward, so that the movable member 151 can limit the bracket from deforming radially outward.

In one embodiment, the first positioning member 131 and the first locking hole 1311 on the first positioning member 131 are eliminated from fig. 2, that is, the positioning assembly 13 includes the connecting member 132 and the second positioning member 133, the connecting member 132 is connected to the proximal end of the connecting member 12, and the second positioning member 133 can be connected to the lateral periphery of the connecting member 132 or the proximal end of the connecting member 132. The second positioning element 133 is provided with a second locking hole 1331, and the limiting element 14 passes through the second locking hole 1331. When the limiting member 14 is used to restrain the rack, the limiting member 14 can be inserted through the distal end of the rack and then inserted into the second locking hole 1331, that is, the position of the limiting member 14 for restraining the rack is located on the distal side of the second positioning member 133. When the distal end of the bracket needs to be released, the movable element 151 can drive the limiting element 14 to move axially from the proximal direction to the distal direction, so that the limiting element 14 is disengaged from the second locking hole 1311. By providing the second locking hole 1331, when the free end of the limiting member 14 is inserted into the second locking hole 1331, the bracket sleeved on the limiting member 14 can be prevented from being separated from the limiting member 14, thereby increasing the stability of the bracket constraint. Of course, it will be understood that the retaining member 14 can still perform the function of restraining the bracket even if the free end is not inserted into the second locking hole 1331. The second locking hole 1311 may also function to provide a radially inward force to the retaining member 14 similar to the first locking hole 1311 in the embodiments described above.

Further, as shown in fig. 2, the positioning assembly 13 includes a first positioning member 131, a connecting member 132 and a second positioning member 133. The distal end of the connecting member 132 is connected to the first positioning member 131, the proximal end of the connecting member 132 is connected to the second positioning member 133, the second positioning member 133 can also be connected to the lateral periphery of the connecting member 132, and the first positioning member 131 and the second positioning member 133 form a locking portion 134 at an interval. The first positioning member 131 is provided with the first locking hole 1311, the second positioning member 133 is provided with the second locking hole 1331, and the limiting member 14 is sequentially inserted through the first locking hole 1311, the locking portion 134 and the second locking hole 1331, and the distal end of the stent 4 is constrained by the locking portion 134. The free end of the limiting member 14 can be inserted into the second locking hole 1331, or can protrude from the proximal end of the second locking hole 1331. In the process that the movable element 151 slides towards the fixed head 11, the movable element 151 drives the limiting element 14 to slide towards the fixed head 11, the limiting element 14 is pulled out from the second locking hole 1331, the constraint on the distal end of the support 4 is released, and the distal end of the support 4 expands in the radial direction.

As shown in fig. 2, the number of the limiting members 14 is not limited, and may be one or more, in an embodiment, the number of the limiting members 14 is multiple, the limiting members 14 are arranged along the circumferential direction of the guide head 10, the distal ends of the limiting members 14 are connected to the movable members 151, and the limiting members 14 and the movable members 151 may be fixedly connected or movably connected. The limiting member 14 and the moving member 151 of the embodiment shown in fig. 2 are movably connected, specifically, the outer sheath core assembly 15 further includes two collars 153, which are respectively movably connected to two opposite ends of the moving member 151 extending out of the sliding slot 121, and each collar 153 is further movably sleeved on the corresponding limiting member 14, so that when the moving member 151 drives the limiting member 14 to move, the limiting member 14 is not too tight, and has a certain moving space, so as to prevent the proximal end of the limiting member 14 from accidentally releasing the distal end of the bracket.

As shown in fig. 2, two ends of the movable element 151 may be connected to one or more limiting elements 14, one end of the movable element 151 is connected to two limiting elements 14, the other end of the movable element 151 is connected to one limiting element 14, and the other ends of the three limiting elements 14 sequentially penetrate through the first locking hole 1311 and the locking portion 134 to be connected to the distal end of the bracket 4, so as to stably constrain the distal end of the bracket 4. The movable member 151 can drive the three limiting members 14 to move towards the guide head 10 at the same time, so that the three limiting members 14 simultaneously release the constraint on the distal end of the bracket 4, and release the bracket 4.

As shown in fig. 7, when the bracket is completely released, the movable member 151 slides to be close to the fixed head 11, the stopper 14 is disengaged from the locking portion 134, and the sheath 35 is located away from the guide head 10. At this time, the sheath 35 can be controlled by the second operation handle to move toward the fixing head 11 until it abuts against the fixing head 11, and the stent delivery device 1 is then withdrawn from the blood vessel.

The following describes a specific structure of the first operating handle for driving the movable element 151 to slide relative to the fixed head 11:

as shown in fig. 2, the outer sheath core assembly 15 further includes an outer sheath core tube 152, and the outer sheath core tube 152 may serve as an intermediate connection. The distal end of the sheath core tube 152 is connected to the movable member 151, and specifically, the sheath core tube 152 is sequentially inserted through the second positioning member 133, the connecting member 132 and the first positioning member 131, and the movable member 151 is connected to the inside of the coupling member 12. The outer sheath core tube 152 is slidably disposed over the inner sheath core tube 16. The outer sheath core tube 152 can slide towards the fixing head 11 relative to the inner sheath core tube 16 to drive the movable member 151 to slide towards the fixing head 11 along the axial direction, and the movable member 151 drives the limiting member 14 to move towards the fixing head 11 to unlock the distal end of the bracket 4.

As shown in fig. 4 and 6, the first operating handle 20 is disposed at the proximal end of the sheath core tube 152, and a user can manually operate the first operating handle 20 to drive the sheath core tube 152 to slide toward the fixing head 11, so as to drive the movable member 151 to slide toward the fixing head 11, and the movable member 151 drives the limiting member 14 to move toward the fixing head 11 to unlock the distal end of the bracket 4.

As shown in fig. 4 and 6, in one embodiment, the first operating handle 20 includes a second housing 24, a drive dog 22, and a release knob 21. The driving tooth block 22 is sleeved outside the outer sheath core tube 152, and the inner side of the driving tooth block 22 is fixedly connected to the outer sheath core tube 152, specifically, the outer wall of the outer sheath core tube 152 is provided with an external thread, the driving tooth block 22 is sleeved on the external thread, and two fixing nuts 23 can be used to connect the external thread from two sides of the driving tooth block 22 by threads to clamp the driving tooth block 22, so that the driving tooth block 22 is fixedly connected with the outer sheath core tube 152, that is, the driving tooth block 22 does not have direct threaded fit with the external thread of the outer sheath core tube 152 actually, and the external thread is used for connecting the fixing nut 23; of course, in some embodiments, other fastening means, such as a snap fit, may be used to fixedly attach the drive block 22 to the outer sheath core 152. The drive dog 22 is restricted from axial rotation about the second housing 24, i.e., the drive dog 22 cannot rotate relative to the second housing 24. Since second housing 24 is fixedly connected to tail guide head 26 and tail guide head 26 is fixedly connected to inner sheath core tube 16, second housing 24 is fixed with respect to inner sheath core tube 16 and drive dog 22 cannot rotate with respect to inner sheath core tube 16. The release knob 21 is rotatably connected to the second housing 24 around the axial direction of the second housing 24, and the release knob 21 is screwed to the outside of the driving block 22, for example, the outside of the driving block 22 is provided with a projection, and the inside of the release knob 21 is provided with a threaded groove, and the projection is inserted into the threaded groove. When the release knob 21 rotates around the axial direction of the second housing 24, the position of the release knob 21 in the axial direction of the second housing 24 is unchanged, since the rotation of the driving tooth block 22 around the axial direction of the second housing 24 is limited, the release knob 21 drives the driving tooth block 22 to slide towards the guide head 10 along the axial direction of the inner sheath core tube 16 or the axial direction of the second housing 24 by matching with the outer side thread of the driving tooth block 22, the driving tooth block 22 drives the outer sheath core tube 152 to slide towards the fixing head 11, the outer sheath core tube 152 drives the movable element 151 to slide towards the fixing head 11, and the movable element 151 drives the limiting element 14 to move towards the fixing head 11 to unlock the distal end of the bracket 4. Therefore, the present embodiment controls the distal end of the unlocking bracket 4 by rotating the release knob 21, which is not only convenient for operation, but also can control the distal end of the unlocking bracket 4 more finely by means of fine adjustment of the screw thread compared with the manner of sliding control.

As shown in fig. 6, it should be noted that there are many structures for limiting the rotation of the driving dental block 22 relative to the second housing 24, for example, a limiting structure is provided on the second housing 24 for limiting the position of the driving dental block 22, and the driving dental block 22 can slide along the axial direction of the second housing 24 but cannot rotate around the axial direction of the second housing 24 through the limiting structure. In this embodiment, the second housing 24 has a first limiting groove 241 along its axial direction, and a part of the driving tooth block 22 is slidably connected to the first limiting groove 241, so that the driving tooth block 22 is limited to rotate around the axial direction of the second housing 24, and the first limiting groove 241 is penetrated through the outer side of the driving tooth block 22 and is threadedly connected to the release knob 21. When the release knob 21 rotates relative to the second housing 24, the first limiting groove 241 limits the driving tooth block 22, so that the driving tooth block 22 cannot rotate relative to the second housing 24, that is, the release knob 21 rotates relative to the driving tooth block 22, and the driving tooth block 22 is driven to move towards the fixed head through the thread transmission fit. It should be noted that the axial direction does not mean that the first limiting groove 241 extends along the axial direction, and mainly emphasizes the guiding function of the first limiting groove 241 on the driving dental block 22 and the limiting function, the guiding function is to make the driving dental block 22 slide from the proximal end of the second housing 24 to the distal end, and the limiting function is to limit the axial rotation of the driving dental block 22 around the second housing 24.

The entire process of distal release of the stent 4 has been described above, and the semi-released configuration of the stent 4 is further described below:

as shown in fig. 3, 5 and 6, in an embodiment, the stent delivery device 1 further includes a second operating handle 30 and a sheath 35, the sheath 35 is disposed around at least a portion of the outer sheath core assembly 15, an accommodating cavity is formed between the sheath 35 and the outer sheath core assembly 15, and the stent 4 is radially compressed in the accommodating cavity. When the user manually manipulates the second operating handle 30, the second operating handle 30 can drive the sheath 35 to slide in the distal-to-proximal direction of the inner sheath core tube 16, so as to release the non-distal portion of the stent 4.

As shown in fig. 5, the second operating handle 30 of the present embodiment includes a first housing 33, an adjustment sleeve 31, and a slider 32. The first housing 33 is slidably connected to the sheath 35, and the adjustment sleeve 31 is rotatably connected to the first housing 33 about the axial direction of the first housing 33. The sliding member 32 is fixedly connected to the sheath 35, and the outer side of the sliding member 32 is screwed to the adjustment sleeve 31. The slider 32 is restricted from rotating in the axial direction of the first housing 33, i.e., the slider 32 cannot rotate relative to the first housing 33. There are many structures for limiting the rotation of the sliding member 32 relative to the first housing 33, and in this embodiment, the second housing 24 is extended axially and distally to be fixedly connected with the first housing 33, at the moment, the second housing 24 and the first housing 33 cannot rotate mutually along the axis, and then the limiting structure is arranged on the second housing 24. Specifically, a second limit groove 242 is formed in the second housing 24 along the axial direction thereof, and the slider 32 is slidably coupled to the second limit groove 242, so that the rotation of the slider 32 around the second housing 24 in the axial direction is limited, and therefore, the rotation of the slider 32 around the first housing 33 is also limited. The outer side of the sliding member 32 is inserted into the second limiting groove 242 and is connected with the inner side of the adjusting sleeve 31 in a threaded fit manner. When the adjusting sleeve 31 is rotated relative to the first housing 33, the position of the adjusting sleeve 31 relative to the first housing 33 is not changed in the axial direction, which is equivalent to rotating in situ, so that the adjusting sleeve 31 drives the sliding member 32 to slide toward the proximal end of the inner sheath core tube 16 through the screw transmission engagement, and the sliding member 32 is fixedly connected to the sheath tube 35, so that the sliding member 32 drives the sheath tube 35 to move toward the proximal end of the inner sheath core tube 16 to release the non-distal portion of the stent. In other embodiments, the second limiting groove 242 may be disposed on the first housing 33.

In order to enable the sheath tube 35 to move towards the proximal end of the inner sheath core tube 16 more quickly to release the stent 4 quickly, the adjusting sleeve 31 can be separated from the first shell 33, and the adjusting sleeve 31 can be directly slid towards the proximal end of the inner sheath core tube 16 to drive the sheath tube 35 to slide towards the proximal end of the inner sheath core tube 16 quickly, so that the working efficiency is improved.

As shown in fig. 5 and 8, in an embodiment, the second operating handle 30 further includes a control switch 34, the control switch 34 is connected to the first housing 33, a locking groove 311 is formed in the adjusting sleeve 31 along the circumferential direction, and the control switch 34 can be engaged with or disengaged from the locking groove 311. When the control switch 34 is engaged with the engaging slot 311, the control switch 34 can limit the position of the adjusting sleeve 31, so that when the adjusting sleeve 31 is rotated relative to the first housing 33, the position of the adjusting sleeve 31 in the axial direction relative to the first housing 33 is not changed, i.e. the adjusting sleeve 31 can be rotated in place and the screw threads drive the sliding member 32 to slide toward the proximal end of the inner sheath core tube 16. When the control switch 34 is separated from the clamping groove 311, the control switch 34 releases the limit of the adjusting sleeve 31, the inner side of the adjusting sleeve 31 is in threaded connection (equivalent to clamping) with the outer side of the sliding part 32, the adjusting sleeve 31 is directly held by hand to slide towards the direction far away from the first shell 33, and the adjusting sleeve 31 drives the sliding part 32 to slide towards the near end of the inner sheath core tube 16 so as to quickly release the stent. Compared with the mode of driving the sliding part 32 to slide through the thread transmission, the mode that the adjusting sleeve 31 directly drives the sliding part 32 to slide through the sliding mode is obviously more efficient. When the adjusting sleeve 31 slides in a direction away from the first housing 33, the adjusting sleeve 31 can be sleeved on the periphery of the second housing 24, and the second housing 24 plays a guiding role in sliding the adjusting sleeve 31.

As shown in fig. 8, there are many structures of the control switch 34 engaged with or disengaged from the adjustment sleeve 31, and in one embodiment, the control switch 34 includes a base 343, an elastic member 342, and a control button 341. The base 343 is fixedly connected to the first housing 33, the control button 341 is slidably connected to the first housing 33, the elastic member 342 is elastically connected between the control button 341 and the base 343, and one end of the control button 341 extends toward the adjusting sleeve 31 to form a snap hook 344 for engaging with the snap slot 311. The elastic force released by the elastic element 342 can drive the snap hook 344 to snap with the slot 311. When the engaging hook 344 needs to be disengaged from the engaging slot 311, the control button 341 can be manually pressed to move the control button 341 toward the base 343, the control button 341 presses the elastic member 342 to accumulate the elastic force, and the engaging hook 344 is disengaged from the engaging slot 311, when the control button 341 is released from being pressed, the elastic member 342 releases the accumulated elastic force to drive the control button 341 to move away from the base 343, and the engaging hook 344 moves to the locking position again, so as to prepare for the next engagement with the engaging slot 311. When the card needs to be re-engaged next time, the adjusting sleeve 31 can directly slide toward the first housing 33, the adjusting sleeve 31 firstly presses the engaging hook 344 to move a short distance toward the base 343, and when the engaging hook 344 corresponds to the card slot 311, the elastic member 342 releases the elastic force to drive the engaging hook 344 to engage with the card slot 311.

The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above embodiments only represent several embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several changes, substitutions and improvements can be made, and all of them should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the claims.

Claims

1. A stent delivery device for releasing a stent within a vessel, the stent delivery device comprising:

an inner sheath core assembly comprising a guide head; and

the outer sheath core assembly comprises a movable member and a limiting member, the limiting member is provided with a free end and a connecting end, the connecting end is connected with the movable member, the movable member is connected with the guide head in a sliding mode to drive the limiting member to move at least along the direction from the near end to the far end of the guide head, the limiting member is configured in such a way that in the moving track of the limiting member relative to the guide head, the position close to the near end of the guide head enables the far end of the bracket to be bound between the free end and the connecting end under the state of radial compression, the position close to the far end of the guide head releases the far end of the bracket through the free end to enable the far end of the bracket to be expanded along the radial direction, and the position where the limiting member is bound to the far end of the bracket is located between the near end of the guide head and the far end of the guide head.

2. The stent delivery device of claim 1, wherein the guide head comprises:

a fixed head;

3. The support conveying device according to claim 2, wherein the connecting member has a sliding groove formed along an axial direction thereof, and the movable member is at least partially disposed in the sliding groove, and the sliding groove is configured to limit a sliding direction of the movable member, so that the movable member slides along the sliding groove in a direction away from the positioning assembly and closer to the fixed head.

4. The device for conveying the stent according to claim 2, wherein the positioning element is provided with a first locking hole, part of the limiting element is inserted into the first locking hole and part of the limiting element is located at a position extending from a proximal end of the first locking hole, and the extending position is used for binding a distal end of the stent to the positioning element, and the limiting element can be retracted and/or disengaged from the first locking hole under the driving of the movable element, so that the limiting element releases the distal end of the stent.

5. The stent delivery device of claim 2, wherein the positioning assembly comprises:

a connecting member; and

the second setting element, the connecting piece connect in the second setting element with link up between the piece, second locking hole has been seted up to the second setting element, the locating part wears to locate the second locking hole, the locating part is used for the constraint the position of support is located the distal side of second setting element, the locating part can be in under the drive of moving part follow the second locking hole breaks away from.

6. The stent delivery device according to claim 3, wherein the number of the position-limiting members is plural, the plural position-limiting members are arranged along the circumferential direction of the guiding head, the distal ends of the plural position-limiting members are connected to the movable member, and the movable member is capable of driving the plural position-limiting members to simultaneously move along the direction from the proximal end to the distal end of the guiding head, so as to release the stent.

7. The stent delivery device according to claim 6, wherein the two ends of the movable member in the radial direction respectively extend from the guide head, at least one of the position limiting members is connected to one end of the movable member from which the movable member extends, and at least another one of the position limiting members is connected to the other end of the movable member from which the movable member extends.

8. The stent delivery device according to claim 7, wherein the position-limiting member is movably connected to the movable member, and the outer sheath core assembly further comprises a plurality of collars, and the collars are movably sleeved on the movable member and the position-limiting member.

9. The stent delivery device according to any of claims 2-6, wherein the inner sheath core assembly further comprises an inner sheath core tube, the guide head being fixed to the inner sheath core tube;

10. The stent delivery device of claim 9, further comprising a first operating handle, the first operating handle comprising:

a second housing;

the release knob is connected to the second shell in an axial rotating mode around the second shell, is in threaded connection with the driving tooth block, and is configured to drive the driving tooth block to slide towards the guide head through axial rotation around the second shell and through threaded fit with the driving tooth block, and the driving tooth block drives the outer sheath core pipe to slide towards the fixing head.

11. The stent delivery device according to claim 10, wherein the second housing has a limiting groove along an axial direction thereof, a portion of the driving block is slidably coupled to the limiting groove so that rotation in the axial direction of the second housing is limited, and a portion of the driving block slidably coupled to the limiting groove passes through the limiting groove and is threadedly coupled to the release knob.

12. The stent delivery device of claim 10, wherein the inner sheath core assembly further comprises:

the tail stop block is fixedly connected with the inner sheath core pipe, and at least part of the tail stop block protrudes out of the inner sheath core pipe in the radial direction of the inner sheath core pipe; and

13. The stent delivery device according to claim 1, further comprising a sheath tube, wherein the sheath tube is sleeved on at least part of the outer sheath core assembly, and a containing cavity for containing a stent is formed between the sheath tube and the outer sheath core assembly.

14. The stent delivery device of claim 13, further comprising a second operating handle, the second operating handle comprising:

the first shell is connected to the sheath tube in a sliding mode;

the sliding part is fixedly connected with the sheath and is in threaded connection with the adjusting sleeve, the sliding part is configured to be limited in rotation around the axial direction of the first shell, and the sliding part is matched with the threads of the adjusting sleeve to drive the sheath to move when the adjusting sleeve rotates relative to the first shell.

15. The stent delivery device of claim 14, wherein the second operating handle further comprises: the control switch is connected to the first shell, the adjusting sleeve is circumferentially provided with a clamping groove, and the control switch is configured to:

16. The stent conveying device according to claim 15, further comprising a second housing fixedly connected to the first housing, wherein the second housing defines a limit groove, the sliding member partially passes through the limit groove so that the sliding member is limited from rotating around the axial direction of the first housing, and a portion of the sliding member passing through the limit groove is in threaded connection with the adjusting sleeve;

17. The stent delivery device of claim 16, wherein the control switch comprises:

the base is fixedly connected to the first shell;

an elastic member; and