CN111374811A - Stent delivery device - Google Patents

Abstract

The present invention provides a stent delivery device for releasing a stent within a vessel, the stent delivery device comprising: the fixing assembly comprises a fixing piece and a limiting piece, and one end of the limiting piece penetrates through the bracket and abuts against the fixing piece so as to lock the bracket; the release assembly comprises a movable piece and a locking piece connected with the movable piece, the movable piece is connected to the other end of the limiting piece, the locking piece is connected with the movable piece in a sliding mode, and when the locking piece is located at the first position, the movable piece is fixed relative to the fixed piece under the limitation of the locking piece; when the locking piece slides to the second position, the movable piece can drive the limiting piece to be away from the fixed piece so as to release the support. The invention provides a stent delivery device capable of effectively releasing a stent at a diseased blood vessel.

Description

stent delivery device

technical field

The invention relates to the technical field of medical devices, in particular to a stent delivery device.

Background technique

Aortic diseases such as aortic aneurysm and aortic dissection are among the most lethal and most difficult vascular surgical diseases to treat. The traditional treatment method is open surgery and artificial blood vessel replacement, which has the risk of large surgical trauma and high mortality. In recent years, a minimally invasive and simple interventional operation method has been developed. The stent-graft is implanted into the diseased blood vessel, and the covered stent is closely attached to the inner wall of the blood vessel to isolate the vascular lesion from the blood flow. The covered stent can not only allow the normal blood flow, but also protect the diseased blood vessels and effectively repair the vascular lesions. However, how to provide a stent delivery device that can effectively release the stent to the diseased blood vessel and improve the therapeutic effect of vascular diseases has become a technical problem to be solved.

SUMMARY OF THE INVENTION

The invention provides a stent delivery device which can effectively release the stent to the diseased blood vessel.

A stent delivery device provided by the present invention is used for releasing a stent into a blood vessel, and the stent delivery device includes:

a fixing component, including a fixing piece and a limiting piece, one end of the limiting piece passes through the bracket and abuts the fixing piece to lock the bracket; and

The release assembly includes a movable piece and a locking piece connected to the movable piece, the movable piece is connected to the other end of the limiting piece, and the locking piece is slidably connected to the movable piece. When the locking piece is located at the first When the movable member is in the second position, the movable member is fixed relative to the fixed member under the restriction of the locking member; when the locking member slides to the second position, the movable member can drive the limiting member away from the fixing member piece to release the bracket.

By setting the lock to lock the movable piece, it prevents the movable piece from driving the limiter to release the bracket when the bracket does not need to be released. By setting the lock to move to different positions, the lock is controlled to lock the movable piece or release the movable piece. With position change, it can quickly determine whether the movable part is in a locked state or a released state, and when the movable part is in a released state, the movable part can drive the limiter to lock the bracket or release the bracket, so as to speed up the release of the bracket and save the time of surgical treatment.

Description of drawings

In order to illustrate the technical solutions of the embodiments of the present invention more clearly, the following briefly introduces the accompanying drawings used in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained from these drawings without any creative effort.

FIG. 1 is a schematic structural diagram of a stent delivery device according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a stent delivery device according to an embodiment of the present invention.

Fig. 3 is a partial cross-sectional view of the proximal end of a stent delivery device according to an embodiment of the present invention.

Fig. 4 is a partial cross-sectional view of the distal end of a stent delivery device according to an embodiment of the present invention.

FIG. 5 is a schematic structural diagram of the distal end of a stent delivery device according to an embodiment of the present invention.

Fig. 6 is an exploded view of a release component in a stent delivery device provided by an embodiment of the present invention.

Fig. 7 is a partial perspective view of the proximal end of a stent delivery device according to an embodiment of the present invention.

8 is a cross-sectional view of an outer sheath sliding assembly in a stent delivery device according to an embodiment of the present invention.

9 is a partial enlarged cross-sectional view of a switch in an outer sheath sliding assembly in a stent delivery device provided by an embodiment of the present invention.

Detailed ways

The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. For ease of description, "proximal", "distal" and "first direction" are used, where "proximal" refers to the end away from the operative end of the stent delivery device, and "distal" refers to the end closer to the stent delivery device One end of the operating end, the "first direction" is the extension direction of the stent delivery device.

Please refer to FIG. 1 and FIG. 2 . FIG. 1 is a stent delivery device 100 according to an embodiment of the present invention. The stent delivery device 100 is used to release the stent 200 at the lesion of the blood vessel. The stent 200 is composed of a tubular rigid wire stent 200 and a polymer film fixed on the outer peripheral surface of the tubular rigid wire stent 200 . The tubular rigid wire stent 200 can be made of elastic rigid wires folded in a Z shape to form a ring, and then a plurality of rings and a polymer film are sutured or bonded together to form the stent-graft 200 . When in use, the stent 200 is axially compressed and then loaded into the stent delivery device 100, which is sent to the diseased blood vessel by the stent delivery device 100 and then released. Due to the elastic force of the tubular rigid wire stent 200, the stent 200 automatically returns to a straight tubular shape. It is close to the inner wall of the blood vessel and isolates the vascular lesion from the blood flow, so as to achieve the purpose of treatment.

Please refer to FIG. 1 and FIG. 2 , the stent delivery device 100 includes a fixing component 1 and a releasing component 2 . The release assembly 2 is arranged along the first direction X with the fixing assembly 1 . Wherein, the fixing component 1 is located at the proximal end of the stent delivery device 100 , and the release component 2 is located at the distal end of the stent delivery device 100 . The fixing assembly 1 is used for fixing the bracket 200 . The release assembly 2 is used to manipulate the fixing assembly 1 to release the bracket 200 .

Referring to FIG. 3 , the fixing assembly 1 includes a fixing member 11 and a limiting member 12 . One end of the limiting member 12 passes through the bracket 200 and abuts against the fixing member 11 to lock the bracket 200 .

Specifically, please refer to FIG. 3 , both the bracket 200 and the limiting member 12 extend along the first direction X. As shown in FIG. The proximal end of the bracket 200 has a hollow portion, and one end of the limiting member 12 (the proximal end of the limiting member 12 ) passes through the hollow portion of the bracket 200 and abuts against the fixing member 11 , so as to close the bracket 200 . The ends are tightened and secured. In other words, the bracket 200 is sleeved on the limiting member 12 . The distal end of the stent 200 is close to the operating end of the stent delivery device 100, and the distal end of the stent 200 is tightened and bound to other positions of the stent delivery device 100 to tighten and bind the stent 200 to the stent delivery device as a whole. On the device 100, it is convenient for the stent delivery device 100 to deliver the stent 200 into the blood vessel.

Referring to FIG. 4 , the release assembly 2 includes a movable member 21 and a locking member 22 connected to the movable member 21 . The movable member 21 is connected to the other end of the limiting member 12 (the distal end of the limiting member 12 ). The movable member 21 is used to drive the limiting member 12 to move away from or approach the fixing member 11 along the first direction X, so that the limiting member 12 releases or locks the bracket 200 . The locking member 22 is used to lock the movable member 21 to prevent the movable member 21 from moving in the first direction X, thereby preventing the stopper 12 from releasing the bracket 200 due to accidental touch when the bracket 200 does not need to be released, causing the bracket 200 to be released. 200 The release is not in the correct position to treat vascular disease.

Referring to FIG. 4 , the locking member 22 is slidably connected to the movable member 21 . When the locking member 22 is in the first position, the movable member 21 is fixed relative to the fixing member 11 under the restriction of the locking member 22 . In other words, when the locking member 22 is in the first position, the movable member 21 is locked, so that the movable member 21 cannot drive the limiting member 12 to move in the first direction X. At this time, the limiting member 12 abuts the fixing member 11 . When the locking member 22 slides to the second position, the movable member 21 can drive the limiting member 12 away from the fixing member 11 to release the bracket 200 . In other words, when the locking member 22 is in the second position, the movable member 21 can drive the limiting member 12 to move along the first direction X, so that the limiting member 12 is away from the fixing member 11, and the limiting member 12 moves to a certain position. In position, it can be separated from the proximal end of the stent 200, thereby releasing the stent 200 within the vessel.

By setting the locking member 22, the movable member 21 is locked to prevent the movable member 21 from driving the limiting member 12 to release the bracket 200 when the bracket 200 does not need to be released. By setting the locking member 22 to move to different positions, the locking member 22 is controlled to lock the movable member 21 or release the movable member 21, because the locking member 22 has a position change, it is beneficial to quickly determine whether the movable member 21 is in a locked state or a released state, and then the movable member 21 can drive the limit member 12 to lock the bracket 200 or release when it is in the released state. The stent 200 is used to speed up the release of the stent 200 and save operation time.

In a possible implementation, please refer to FIG. 5 , the outer surface of the release assembly 2 is provided with a first mark 201 . When the locking member 22 is in the first position, the locking member 22 is facing the first mark 201 , and at this time, the locking member 22 locks the movable member 21 . When the bracket 200 is positioned on the limiting member 12 , the limiting member 12 locks the bracket 200 . When the locking member 22 is in the second position, the locking member 22 is staggered from the first mark 201 , the locking member 22 releases the movable member 21 , and the movable member 21 can drive the limiting member 12 move, so that the stopper 12 releases the bracket 200 .

Specifically, the first identification 201 corresponds to the state in which the locking member 22 locks the movable member 21 . The first identification 201 may be a protrusion or a groove provided on the outer surface of the release assembly 2 , or may be an identification patch or the like attached to the outer surface of the release assembly 2 . Of course, in other embodiments, the first identification 201 may also be a status indicator light or a buzzer or the like.

By arranging the first mark 201 on the outer surface of the release assembly 2, the first mark 201 can be easily seen by the operator, so that the operator can quickly and intuitively judge whether the movable member 21 is in the locked state or the released state, improving the judgment The intuitiveness reduces operation and saves time.

Further, please refer to FIG. 5 , the outer surface of the release assembly 2 is further provided with a second mark 202 which is spaced from the first mark 201 . When the locking member 22 is located at the second position, the locking member 22 is facing the second mark 202 .

Specifically, the first mark 201 and the second mark 202 can be arranged on the outer peripheral surface of the release assembly 2 at intervals, and the first mark 201 is close to and faces the first position, and the second mark 202 is close to and faces the second position .

Specifically, the second identification 202 corresponds to the state in which the locking member 22 releases the movable member 21 . Similarly, the second mark 202 may be a protrusion or a groove provided on the outer surface of the release assembly 2, or may be an identification patch attached to the outer surface of the release assembly 2, or may be a state Indicator light or buzzer, etc.

By arranging the first mark 201 and the second mark 202 on the outer surface of the release assembly 2, the first mark 201 and the second mark 202 can be easily seen by the operator, so that the operator can quickly and intuitively judge the movable part 21 Whether it is in a locked state or a released state, it improves the intuitiveness of judgment, reduces operations and saves time.

Referring to FIG. 2 , the movable member 21 has a central axis. The central axis is in the X direction. The fixing member 11 , the limiting member 12 and the movable member 21 are arranged along the extending direction of the central axis.

In a possible implementation, please refer to FIG. 6 , a first chute 211 and a second chute 212 which are connected end to end are provided on the outer peripheral surface of the movable member 21 . The first chute 211 extends along the circumferential direction of the movable member 21 . The second sliding groove 212 extends along the direction of the central axis L, and one end of the locking member 22 can slide along the first sliding groove 211 and the second sliding groove 212 .

Specifically, the movable member 21 may be cylindrical. The axial direction of the movable member 21 is the first direction X. Of course, in other embodiments, the movable member 21 may also have other cylindrical shapes such as a square cylindrical shape.

By arranging the first chute 211 and the second chute 212 on the outer peripheral surface of the movable member 21 . Wherein, the first sliding groove 211 extends along the circumferential direction of the movable member 21 , and the second sliding groove 212 extends along the first direction X. As shown in FIG. When the locking member 22 is located in the first chute 211 , the locking member 22 locks the movable member 21 in the first direction X to limit the movable member 21 from moving in the first direction X, and at this time, the limiting member 12 abuts the fixing member 11 . When the limiting member 12 passes through the stent 200 , the limiting member 12 fixes the stent 200 on the stent delivery device 100 . When the locking member 22 slides to the second sliding slot 212, the locking member 22 releases the movable member 21, so that the movable member 21 can move in the first direction X, and then the movable member 21 can drive the limiting member 12 away from the first direction X. The fixing member 11 is used to release the bracket 200 on the limiting member 12, or the movable member 21 can drive the limiting member 12 to approach the fixing member 11 along the first direction X, so as to return the limiting member 12 to the initial position after releasing the bracket 200 .

Further, the first position and the second position are located at the first chute 211 and the second chute 212 respectively. Specifically, the first position may be any position within the first chute 211 , and the second position may be any position of the second chute 212 . That is, when the locking member 22 is located in the first sliding groove 211 , the movable member 21 is fixed relative to the fixing member 11 under the restriction of the locking member 22 . When the locking member 22 slides to the second sliding slot 212 , the movable member 21 can drive the limiting member 12 away from the fixing member 11 to release the bracket 200 .

Further, please refer to FIG. 6 , the movable member 21 has a first end surface 213 . The second chute 212 penetrates through the first end surface 213 . When the movable member 21 is away from the fixing member 11 , the locking member 22 can slide out through the second chute 212 until it is separated from the movable member 21 . It can be understood that the first end surface 213 is close to the fixing member 11 .

By arranging the second chute 212 to penetrate the first end surface 213 , the locking member 22 can slide out of the second sliding slot 212 . At this time, the movable member 21 is separated from the locking member 22 , and the movable member 21 is controlled to be pulled along the first direction X to limit the movement. The positioning member 12 can be quickly separated from the fixing member 11 so that the stent 200 can be quickly released, so that the stent 200 can be released at an accurate position and the operation time can be reduced. Moreover, the movable member 21 separated from the locking member 22 can flexibly move in a suitable process to drive the limiting member 12 to move a suitable distance, so that the limiting member 12 can release the bracket 200 without being separated from the fixing member 11 Too far makes it difficult to return to the original position.

Referring to FIG. 6 , the release assembly 22 further includes a first sleeve 23 . The first sleeve 23 is sleeved on the periphery of the movable member 21 . The first sleeve 23 has a limiting hole 231 . The locking member 22 is arranged on the first sleeve 23 . The locking member 22 is slidably connected to the movable member 21 through the limiting hole 231 .

It can be understood that the central axis L of the first sleeve 23 is along the first direction X. The first sleeve 23 can restrain the locking member 22 in the radial direction, so that the locking member 22 can be slidably connected to the movable member 21 .

In a possible implementation manner, the limiting hole 231 is an elongated hole. Specifically, the limiting hole 231 may extend along the circumferential direction of the first sleeve 23 . When the locking member 22 slides, the first sleeve 23 is fixed relative to the fixing member 11 , and the locking member 22 can slide in the limiting hole 231 . In other embodiments, the locking member 22 can be fixed on the first sleeve 23 . When the locking member 22 slides, the locking member 22 and the first sleeve 23 rotate together around the first direction X, so that one end of the locking member 22 is slidably connected to the movable member 21 .

Further, please refer to FIG. 6 , the limiting hole 231 extends along the circumferential direction of the first sleeve 23 . The locking member 22 can slide from one end of the first sliding slot 211 to the other end of the first sliding slot 211 along the limiting hole 231 , and the inner wall of the limiting hole 231 restricts the locking member 22 It is fixed relative to the first sleeve 23 in the direction of the central axis.

By setting the limiting hole 231 as a bar-shaped hole extending in the circumferential direction, the limiting hole 231 provides a sliding space for the locking member 22, so that the locking member 22 can slide along the circumferential direction of the first sleeve 23 and limit the lock The fixing member 22 is axially fixed relative to the first sleeve 23, so that the position of the locking member 22 can be changed, and it is convenient to quickly identify that the movable member 21 is in the locked state and the released state, thereby increasing the release speed of the bracket 200.

Further, when the locking member 22 slides out through the second chute 212, the movable member 21 is separated from the first sleeve 23 and the locking member 22, and the limiting member 12 is located where The movable member 21 moves away from the fixing member 11 under the driving of the movable member 21, thereby releasing the stent 200, thereby realizing the treatment of vascular diseases.

In a possible implementation, referring to FIG. 6 , the movable member 21 includes a connecting portion 215 and an operating portion 216 that are connected to each other. The connecting portion 215 is provided with the first sliding groove 211 and the second sliding groove 212 . The first sleeve 23 is sleeved on the outer peripheral surface of the connecting portion 215 . The connecting portion 215 is connected to the limiting member 12 . The operating portion 216 is disposed outside the first sleeve 23 , and the operating portion 216 is used to move under the action of an external force and drive the connecting portion 215 and the limiting member 12 away from or close to the fixing member Piece 11.

Specifically, please refer to FIG. 6 , the operation part 216 may be a structure for hand-held. When the locking member 22 releases the movable member 21 , the operator holds the operating portion 216 and pulls the operating portion 216 toward the distal end of the stent delivery device 100 , and the operating portion 216 drives the connecting portion 215 to approach the distal end of the stent delivery device 100 . , the limiting member 12 approaches the distal end of the stent delivery device 100 under the action of the connecting portion 215 , so that the limiting member 12 gradually moves away from the fixing member 11 , thereby rapidly releasing the stent 200 at the vascular lesion.

In a possible implementation, please refer to FIG. 6 , the locking member 22 includes a toggle portion 221 and a sliding portion 222 which are connected to each other. The toggle portion 221 abuts the outer peripheral surface of the first sleeve 23 . The sliding portion 222 penetrates through the limiting hole 231 and abuts the inner peripheral surface of the first sleeve 23 . The toggle portion 221 is used for sliding relative to the first sleeve 23 under the action of an external force, so as to drive the sliding portion 222 to slide along the limiting hole 231 of the first sleeve 23 .

By sliding the toggle portion 221 , the operator can make the sliding portion 222 slide along the limiting hole 231 , that is, the operator operates the toggle portion 221 to make the locking member 22 lock the movable member 21 and release the movable member 21 . It is simple, convenient, highly feasible, and fast to operate, so as to improve the release efficiency of the stent 200 .

Further, the toggle portion 221 and the sliding portion 222 are detachably connected, so that the locking member 22 can be easily and quickly installed on the first sleeve 23 .

In a possible implementation, please refer to FIG. 6 , the toggle portion 221 is connected with the sliding portion 222 in a snap-fit connection. The toggle portion 221 includes a cover plate 223 and a hook 224 disposed on the cover plate 223 . The cover plate 223 abuts the outer surface of the first sleeve 23 . The sliding portion 222 has a through hole 227 connecting the first sliding portion 225 and the second sliding portion 226 and passing through the first sliding portion 225 and the second sliding portion 226 . The first sliding portion 225 is slidably connected to the limiting hole 231 of the first sleeve 23 . The second sliding portion 226 is slidably connected to the first sliding groove 211 and the second sliding groove 212 of the movable member 21 . The hook 224 is engaged with the second sliding portion 226 through the through hole 227 , so that one end of the first sliding portion 225 abuts the cover plate 223 .

In other embodiments, the toggle portion 221 and the sliding portion 222 may also be connected by screw connection or magnetic connection.

Further, please refer to FIG. 6 , the outer surface of the cover plate 223 is provided with ridges 228 , so that the ridges 228 play an anti-slip effect when the operator manually moves the cover plate 223 .

In combination with any of the above-mentioned embodiments, in a possible embodiment, referring to FIG. 7 , the fixing assembly 1 further includes a guide member 13 . The guide member 13 is disposed opposite to the fixing member 11 . The guide 13 is close to the operating end of the rack transporter 100 . A receiving space 14 is formed between the guide member 13 and the fixing member 11 . The accommodating space 14 is used for accommodating the end of the bracket 200 . One end of the limiting member 12 penetrates the guide member 13 and extends into the receiving space 14 so as to pass through the end of the bracket 200 and abut the fixing member 11 .

Specifically, please refer to FIG. 7 , the guide member 13 can be fixedly connected to the fixing member 11 . The fixing member 11 has a first surface 111 facing the guide member 13 . The guide member 13 has a second surface 131 facing the fixing member 11 . Protrusions 132 may be provided on the second surface 131 . The protrusions 132 may be connected to the first surface 111 . The radial dimension of the protrusion 132 may be smaller than the radial size of the first surface 111 and the second surface 131 , that is, the protrusion 132 is concave radially relative to the fixing member 11 and the guide member 13 . The first surface 111 , the second surface 131 and the outer peripheral surface of the protrusion 132 form the receiving space 14 .

Further, the guide member 13 may be integrally formed with the fixing member 11 , that is, one end of the protrusion 132 is integrally formed with the guide member 13 , and the other end is integrally formed with the fixing member 11 .

By arranging the fixing member 11 and the guiding member 13 in the fixing assembly 1 , wherein the fixing member 11 cooperates with the limiting member 12 , so that the limiting member 12 locks one end of the bracket 200 , and the guiding member 13 provides a guide for the limiting member 12 , so that the limiting member 12 moves away from or approaches the fixing member 11 along the first direction X, and in the process of the limiting member 12 being away from the fixing member 11 , one end of the bracket 200 is blocked by the guiding member 13 and is separated from the limiting member 12 . separation, thereby realizing the release of the stent 200 .

Further, please refer to FIG. 7 , the first surface 111 is provided with a first through hole 112 . Specifically, the first through hole 112 may be a blind hole. The first through holes 112 extend along the first direction X. When the locking member 22 is located at the first position or the second position, one end of the limiting member 12 is driven into or out of the first through hole 112 by the movable member 21 . By arranging the first through hole 112 on the fixing member 11 , the limiting member 12 can protrude into the first through hole 112 , so as to realize the engaging connection between the fixing member 11 and the limiting member 12 , thereby facilitating the locking of the limiting member 12 bracket 200, so that the bracket 200 is not easily disengaged.

Further, referring to FIG. 7 , the guide member 13 has a second through hole 133 . The second through hole 133 may penetrate the guide member 13 along the first direction X. The second through hole 133 is aligned with the first through hole 112 . The limiting member 12 penetrates through the second through hole 133 and is slidably connected to the guide member 13 .

Specifically, the proximal end of the limiting member 12 extends into the first through hole 112 through the second through hole 133 . When the movable member 21 drives the limiting member 12 to move, the limiting member 12 moves along the second through hole 133 . The through hole 133 slides to extend into or out of the first through hole 112 , thereby locking or releasing the bracket 200 .

By arranging the second through hole 133 on the guide member 13, the second through hole 133 plays a guiding role for the limiting member 12, and the second through hole 133 is aligned with the first through hole 112, so that the limiting member 12 can accurately into the first through hole 112 .

Specifically, when the limiting member 12 is moved away from the fixing member 11 by the movable member 21, the end of the limiting member 12 can be retracted into the second through hole 133, and the bracket 200 is separated from the limiting member 12 under the blocking of the guiding member 13 . The guide member 13 plays a role of assisting the separation of the bracket 200 from the limiting member 12 .

In a possible implementation manner, referring to FIG. 7 , the number of the first through holes 112 is multiple. The plurality of first through holes 112 are arranged in a circle. The number and arrangement of the second through holes 133 are the same as the number and arrangement of the first through holes 112 . A first through hole 112 faces a second through hole 133 . The number of the limiting members 12 is multiple. The plurality of limiting members 12 are arranged in a tubular shape. One of the limiting members 12 passes through one of the second through holes 133 and is aligned with or inserted into one of the first through holes 112 .

Specifically, please refer to FIG. 3 and FIG. 7 , the bracket 200 is tubular. The proximal end of the bracket 200 has a plurality of hollow portions, and the plurality of limiting members 12 respectively pass through the plurality of hollow portions and abut against the fixing member 11 , so that the proximal end of the bracket 200 is tightened and fixed on the limiting member 12 .

By arranging a plurality of limiting members 12 to fix the stent 200 in the circumferential direction, so that the proximal end of the stent 200 is tightened and kept in a tubular shape, the firmness of the stent 200 being fixed on the limiting members 12 can also be improved.

In combination with any of the above-mentioned embodiments, in a possible embodiment, please refer to FIG. 3 , the stent delivery device 100 further includes an inner sheath core 3 . The fixed part 11 and the movable part 21 are sleeved on the periphery of the inner sheath core 3 . The fixing member 11 is fixed relative to the inner sheath core 3 . The movable member 21 is slidably connected to the inner sheath core 3 .

Specifically, the inner sheath core 3 extends along the first direction X. The fixing member 11 , the guiding member 13 , the locking member 22 and the movable member 21 are sequentially sleeved on the periphery of the inner sheath core 3 .

It can be understood that the inner sheath core 3 can be in the shape of a hollow tube, which can drain the liquid into the blood vessel.

By arranging the inner sheath core 3 , the inner sheath core 3 can connect the fixing member 11 , the guiding member 13 , the locking member 22 and the movable member 21 together. Meanwhile, the inner sheath core 3 also plays a guiding role for the sliding of the movable member 21 .

Further, referring to FIG. 3 , the stent delivery device 100 further includes an outer sheath tube 4 . The outer sheath tube 4 is sleeved on the periphery of the inner sheath core 3 . An accommodation cavity 40 is formed between the outer sheath tube 4 and the inner sheath core 3 . The bracket 200 is compressed in the accommodating cavity 40 .

The accommodating cavity 40 is formed by arranging the outer sheath tube 4 and the inner sheath core 3. Since the accommodating cavity 40 is tubular, the tubular stent 200 can be kept in a tubular shape and tightened in the accommodating cavity 40. On the one hand, the stent can be fully utilized. The space in the delivery device 100, on the other hand, the stent 200 can be transported after being tightened, which can reduce the size of the stent delivery device 100, thereby reducing the interference of the stent delivery device 100 to the blood vessel, and the stent 200 can be transported in a tubular shape. When released, the stent 200 can be easily restored to its original shape, so as to realize the treatment of the vascular lesions by the stent 200 .

In a possible implementation manner, the material of the inner sheath core 3 and the outer sheath tube 4 is a bendable material, which can improve the bending performance of the stent delivery device 100 to facilitate the stent delivery device 100 to deliver the stent 200 to the At the curved blood vessel, the application scenarios of the stent delivery device 100 are increased.

Specifically, the limiting member 12 is disposed in the accommodating cavity 40 . The bracket 200 is disposed between the limiting member 12 and the outer sheath 4 .

When there are multiple limiting members 12 , the multiple limiting members 12 are annularly disposed in the accommodating cavity 40 . The distal end of the stent 200 is sleeved on the periphery of the plurality of limiting members 12 .

The limiting member 12 is accommodated between the inner sheath core 3 and the outer sheath tube 4 , and the limiting member 12 is disposed in the stent 200 , so that the limiting member 12 does not affect the distal release of the stent 200 .

Further, the material of the limiting member 12 is a bendable material, which further increases the bending performance of the stent delivery device 100 , so that the stent delivery device 100 can transport the stent 200 to the curved blood vessel, thereby increasing the application of the stent delivery device 100 Scenes.

Specifically, the limiting members 12 are distributed in the accommodating cavity 40. When the stent delivery device 100 enters the curved and extended blood vessel, the limiting members 12 can bend along with the inner sheath core 3 and the outer sheath tube 4, so that The stent delivery device 100 is enabled to deliver the stent 200 to a tortuous vessel.

Further, please refer to FIG. 3 , one end of the outer sheath tube 4 is in abutment with the fixing member 11 . The outer sheath tube 4 can slide relative to the inner sheath core 3 . When the outer sheath tube 4 is away from the fixing member 11 , and the part of the bracket 200 exposed from the outer sheath tube 4 is opened under the action of its own tension.

Specifically, one end of the outer sheath tube 4 is in contact with the fixing member 11 to cover the limiting member 12 , the bracket 200 and the guide member 13 in the outer sheath tube 4 to prevent the bracket 200 from being affected by the outside world.

During the process of the outer sheath 4 moving away from the fixing member 11 , the portion of the proximal end of the stent 200 exposed to the outer sheath 4 loses the restraint of the outer sheath 4 and then expands. Due to the limitation, the stent 200 cannot be fully released.

Further, referring to FIG. 4 , there is a retreat space 41 between the other end of the outer sheath tube 4 (the distal end of the outer sheath tube 4 ) and the release component 2 . When the outer sheath 4 is away from the fixing member 11 , the other end of the outer sheath 4 (the distal end of the outer sheath 4 ) gradually extends into the retreating space 41 , in other words, the retreating space 41 An escape space is formed. When the outer sheath 4 is far away from the fixing member 11, the retreat space 41 prevents the other end of the outer sheath 4 (the distal end of the outer sheath 4) from contacting the release assembly 2 and the outer sheath 4 cannot be retreated. .

In a possible implementation, please refer to FIG. 8 , the stent delivery device 100 further includes an outer sheath sliding assembly 5 . The outer sheath sliding component 5 is arranged between the fixing component 1 and the releasing component 2 . The outer sheath sliding assembly 5 is sleeved around the outer sheath 4 . The outer sheath tube sliding assembly 5 is used to drive the outer sheath tube 4 away from the fixing member 11 .

It can be understood that when the stent 200 is installed in the blood vessel of the subject to be treated, the outer sheath slide assembly 5 and the release assembly 2 are disposed outside the subject to be treated, so that the operator can control the opening and release of the stent 200 .

By operating the outer sheath sliding assembly 5, the outer sheath 4 is controlled to be away from the fixing member 11, which is convenient to operate and has strong controllability.

In a possible implementation, please refer to FIG. 8 , the outer sheath sliding assembly 5 includes a second sleeve 51 and a driving assembly 52 threadedly connected to the second sleeve 51 . The second sleeve 51 is sleeved on the periphery of the outer sheath tube 4 and is slidably connected with the outer sheath tube 4 . The driving assembly 52 is sleeved around the outer sheath 4 and is fixedly connected with the outer sheath 4 . When the driving assembly 52 rotates relative to the second sleeve 51 , the driving assembly 52 gradually moves away from the second sleeve 51 , and the outer sheath 4 gradually moves away from the driving assembly 52 The fixing member 11 is used to gradually expose the proximal end of the stent 200 to the outer sheath tube 4 .

In a possible implementation, please refer to FIG. 8 , the driving assembly 52 includes a locking member 521 and a sliding sleeve 522 . One end of the locking member 521 is threadedly connected to the second sleeve 51 . The other end of the locking member 521 is detachably connected to the sliding sleeve 522 . Specifically, the other end of the locking member 521 is connected with the sliding sleeve 522 in a snap-fit connection. The locking member 521 is slidably connected to the outer sheath tube 4 . The sliding sleeve 522 is fixedly connected to the outer sheath tube 4 . When the locking member 521 is separated from the sliding sleeve 522 , the sliding sleeve 522 can drive the outer sheath 4 to gradually move away from the fixing member 11 .

By arranging the locking member 521 and the sliding sleeve 522, the locking member 521 is threadedly connected with the second sleeve 51, and the locking member 521 is controlled to rotate relative to the second sleeve 51, so that the outer sheath tube 4 can be slowly The proximal end of the stent 200 is gradually opened after a small backward stroke; the locking member 521 and the sliding sleeve 522 are engaged, and when the locking member 521 is separated from the sliding sleeve 522, the sliding sleeve 522 is no longer locked. After being restrained by the member 521 , the outer sheath tube 4 can be driven to retreat by a large distance, so that the outer sheath tube 4 can be quickly retracted by a relatively large stroke, so that the proximal end and the distal end of the stent 200 can be opened.

Further, please refer to FIG. 8 , the locking member 521 includes a third sleeve 523 and a switch 524 disposed on the third sleeve 523 . The third sleeve 523 is sleeved on the outer sheath tube 4 and slides relative to the outer sheath tube 4 . The switch 524 is slidably connected to the third sleeve 523 along the radial direction of the third sleeve 523 . The engaging portion 528 of the switch 524 is engaged with the sliding sleeve 522 . When the switch 524 slides to the pressed position, the engaging portion 528 of the switch 524 is separated from the sliding sleeve 522 .

Further, please refer to FIG. 8 , the switch 524 has a pressing portion 525 , an elastic member 526 and a base 527 arranged in sequence along the radial direction of the third sleeve 523 . The pressing portion 525 is disposed on the outer peripheral surface of the third sleeve 523 . The elastic member 526 elastically abuts between the pressing portion 525 and the base 527 , so that there is a distance 529 between the pressing portion 525 and the base 527 . The engaging portion 528 extends from one end of the pressing portion 525 toward the sliding sleeve 522 . When the pressing portion 525 abuts on the base 527 , the switch 524 is in the pressed position. When the sliding sleeve 522 abuts against the third sleeve 523 and the switch 524 rebounds from the pressed position under the action of the elastic member 526 , the engaging portion 528 of the switch 524 is in The pressing portion 525 is engaged with the sliding sleeve 522 under the action of the pressing portion 525 .

The operation process of using the stent delivery device 100 of the present invention is as follows:

During the operation, the blood vessel of the subject to be treated is first punctured, a guide wire is inserted, and then the stent delivery device 100 is sent into the aorta along the guide wire. Under X-ray fluoroscopy monitoring, the stent delivery device 100 is moved to the vicinity of the lesion, the second sleeve 51 is fixed, the locking member 521 is rotated, and the outer sheath 4 is slowly retreated, so that the proximal end of the stent 200 is slowly opened, At this time, since the proximal end of the stent 200 is still bound by the limiting member 12, the stent 200 has not been fully opened. By moving the stent delivery device 100, the stent 200 is moved to the most suitable release position; press the switch 524 on the locking member 521. At the same time, the sliding sleeve 522 is pulled back to complete the opening of the main body of the bracket 200; At the proximal end of the stent 200, the stent 200 is completely detached from the stent delivery device 100, the release process is completed, and finally the stent delivery device 100 is withdrawn from the subject to be treated along the guide wire.

It can be understood that “pulling back” and “retracting” in this application refer to moving toward the operating end of the stent delivery device 100 .

The above are some embodiments of the present invention. It should be pointed out that for those skilled in the art, without departing from the principle of the present invention, several improvements and modifications can be made, and these improvements and modifications are also regarded as It is the protection scope of the present invention. It can be understood that different embodiments of the present invention can be combined with each other.

Claims (32)

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

the fixing assembly comprises a fixing piece and a limiting piece, and one end of the limiting piece penetrates through the bracket and abuts against the fixing piece so as to lock the bracket; and

the release assembly comprises a movable piece and a locking piece connected with the movable piece, the movable piece is connected to the other end of the limiting piece, the locking piece is connected with the movable piece in a sliding mode, and when the locking piece is located at the first position, the movable piece is fixed relative to the fixed piece under the limitation of the locking piece; when the locking piece slides to the second position, the movable piece can drive the limiting piece to be away from the fixed piece so as to release the support.

2. The stent delivery device according to claim 1, wherein the release assembly has a first sleeve, the outer surface of the first sleeve is provided with a first mark, the locking member is slidably connected with the first sleeve, when the locking member is located at the first position, the locking member faces the first mark, and the limiting member locks the stent; when the locking piece is located at the second position, the locking piece is staggered with the first mark, and the limiting piece releases the support.

3. The stent delivery device of claim 2, wherein the outer surface of the first sleeve further defines a second indicia, the locking member facing the second indicia when the locking member is in the second position.

4. The rack transport apparatus according to any one of claims 1 to 3, wherein the movable member has a central axis, and the fixed member, the stopper member and the movable member are arranged in a direction of the central axis.

5. The stent delivery device according to claim 4, wherein the movable member has a first sliding groove and a second sliding groove on an outer peripheral surface thereof, the first sliding groove and the second sliding groove being connected end to end, the first sliding groove extending in a circumferential direction of the movable member, the second sliding groove extending in a direction of the central axis, and one end of the locking member being slidable along the first sliding groove and the second sliding groove.

6. The stent delivery device of claim 5, wherein the first position and the second position are located at the first runner and the second runner, respectively.

7. The stent delivery device according to claim 5, wherein the movable member has a first end surface through which the second sliding groove extends, and when the movable member is away from the fixed member, the locking member can slide out through the second sliding groove until being separated from the movable member.

8. The stent delivery device according to claim 7, wherein the release member further comprises a first sleeve, the first sleeve is disposed around the movable member, the first sleeve has a limiting hole, the locking member is disposed on the first sleeve, and the locking member is slidably coupled to the movable member through the limiting hole.

9. The stent delivery device according to claim 8, wherein the stopper hole extends in a circumferential direction of the first sleeve, the locking member is slidable along the stopper hole from one end of the first sliding groove to the other end of the first sliding groove, and an inner wall of the stopper hole restricts the locking member from being fixed relative to the first sleeve in a central axis direction.

10. The stent delivery device according to claim 9, wherein when the locking member slides out through the second sliding groove, the movable member is separated from the first sleeve, and the position limiting member is moved away from the fixed member by the movable member.

11. The stent conveying device according to claim 8, wherein the movable member includes a connecting portion and an operating portion connected to each other, the connecting portion has the first sliding groove and the second sliding groove, the first sleeve is sleeved on an outer peripheral surface of the connecting portion, the connecting portion is connected to the limiting member, the operating portion is disposed outside the first sleeve, and the operating portion is configured to move under an external force to drive the connecting portion and the limiting member to move away from or close to the fixing member.

12. The stent delivery device according to claim 8, wherein the locking member includes a shifting portion and a sliding portion connected to each other, the shifting portion abuts against the outer peripheral surface of the first sleeve, the sliding portion extends through the limiting hole and abuts against the inner peripheral surface of the first sleeve, and the shifting portion is configured to slide relative to the first sleeve under an external force to drive the sliding portion to slide along the limiting hole of the first sleeve.

13. The stent delivery device of claim 12, wherein the toggle portion is removably coupled to the slide portion.

14. The stent delivery device of claim 12, wherein the toggle portion comprises a cover plate and a hook disposed on the cover plate, the cover plate abutting against an outer surface of the first sleeve; the sliding part is provided with a first sliding part, a second sliding part and a through hole penetrating through the first sliding part and the second sliding part, the first sliding part is connected with the limiting hole of the first sleeve in a sliding mode, and the second sliding part is connected with the first sliding groove and the second sliding groove of the moving part in a sliding mode; the clamping hook is buckled with the second sliding part through the through hole, so that one end of the first sliding part is abutted to the cover plate.

15. The stent delivery device of claim 14, wherein the cover plate is provided with a raised pattern on an outer surface thereof.

16. The stent conveying device according to any one of claims 1 to 3 or 5 to 15, wherein the fixing assembly further comprises a guide member, the guide member is disposed opposite to the fixing member, a receiving space is formed between the guide member and the fixing member, the receiving space is used for receiving an end portion of the stent, and one end of the limiting member penetrates through the guide member and extends into the receiving space so as to penetrate through the end portion of the stent and abut against the fixing member.

17. The stent delivery device according to claim 16, wherein the fixed member has a first surface opposite to the guide member, the first surface is provided with a first through hole, and when the locking member is located at the first position or the second position, one end of the position-limiting member is driven by the movable member to extend into or withdraw from the first through hole.

18. The stent delivery device of claim 17, wherein the guide member has a second through hole aligned with the first through hole, and the retaining member extends through the second through hole and slidably engages the guide member.

19. The apparatus according to claim 18, wherein when the position-limiting member is moved away from the fixed member by the movable member, the end of the position-limiting member can be retracted into the second through hole, and the end of the bracket is separated from the position-limiting member by the stop of the guiding member.

20. The stent delivery device according to claim 18, wherein the first through holes are plural in number, the first through holes are arranged in a circular shape, the second through holes are identical in number and arrangement to the first through holes, the retaining members are plural in number, and one retaining member penetrates one of the second through holes and is aligned with or inserted into one of the first through holes.

21. The stent delivery device according to any one of claims 1 to 3, 5 to 15, or 17 to 20, further comprising an inner sheath core, wherein the fixed member and the movable member are sleeved on the periphery of the inner sheath core, the fixed member is fixed relative to the inner sheath core, and the movable member is slidably connected with the inner sheath core.

22. The stent delivery device according to claim 21, further comprising an outer sheath sleeved on the outer periphery of the inner sheath core, wherein a receiving cavity is formed between the outer sheath and the inner sheath core, and the stent is compressed in the receiving cavity.

23. The stent delivery device of claim 22, wherein the inner sheath core and the outer sheath are made of a flexible material.

24. The stent delivery device of claim 22, wherein the retaining member is disposed within the receiving cavity, and the stent is disposed between the retaining member and the sheath.

25. The stent delivery device of claim 1, wherein the stop is made of a bendable material.

26. The stent delivery device of claim 22, wherein an end of the outer sheath abuts the fixing member, the outer sheath is slidable relative to the inner sheath core, and when the outer sheath is away from the fixing member, the portion of the stent exposed from the outer sheath is expanded by its own tension.

27. The stent delivery device of claim 26, wherein a receding space is provided between the other end of the outer sheath and the release member, and the other end of the outer sheath extends into the receding space when the outer sheath is away from the fixing member.

28. The stent delivery apparatus of claim 27, further comprising an outer sheath sliding assembly, wherein the outer sheath sliding assembly is disposed between the fixing assembly and the releasing assembly, the outer sheath sliding assembly is disposed around the outer sheath, and the outer sheath sliding assembly is configured to move the outer sheath away from or close to the fixing member.

29. The stent delivery device of claim 28, wherein the outer sheath sliding assembly comprises a second sleeve and a driving assembly threadedly coupled to the second sleeve, the second sleeve is disposed around the outer sheath and slidably coupled to the outer sheath, the driving assembly is disposed around the outer sheath and fixedly coupled to the outer sheath, the driving assembly is gradually separated from the second sleeve when the driving assembly rotates relative to the second sleeve, and the outer sheath is gradually separated from the fixing element by the driving assembly.

30. The stent delivery device of claim 29, wherein the driving assembly comprises a locking member and a sliding sleeve, one end of the locking member is threadedly connected to the second sleeve, the locking member is slidably connected to the outer sheath, the other end of the locking member is detachably connected to the sliding sleeve, the sliding sleeve is fixedly connected to the outer sheath, and the sliding sleeve can drive the outer sheath to move away from the fixing member gradually when the locking member is separated from the sliding sleeve.

31. The stent delivery device according to claim 30, wherein the locking member comprises a third sleeve and a switch disposed on the third sleeve, the third sleeve is disposed on the outer sheath and slides relative to the outer sheath, the switch is slidably connected to the third sleeve along a radial direction of the third sleeve, and a locking portion of the switch is engaged with the sliding sleeve, and when the switch slides to the depressed position, the locking portion of the switch is separated from the sliding sleeve.

32. The stent delivery device according to claim 31, wherein the switch has a pressing portion, an elastic member and a base, which are sequentially arranged in a radial direction of the third sleeve, the pressing portion is disposed on an outer circumferential surface of the third sleeve, the elastic member elastically abuts between the pressing portion and the base so that a space is provided between the pressing portion and the base, the engaging portion extends from one end of the pressing portion toward the sliding sleeve, and when the pressing portion abuts against the base, the switch is located at the pressed position; when the sliding sleeve abuts against the third sleeve and the switch rebounds from the pressing position under the action of the elastic piece, the buckling part of the switch is clamped with the sliding sleeve under the action of the pressing part.

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