CN116262078A

CN116262078A - Support conveying device and support conveying system

Info

Publication number: CN116262078A
Application number: CN202111528102.7A
Authority: CN
Inventors: 曹洋; 张宇; 王金耀; 高凌岳; 朱清
Original assignee: Shanghai Tuomai Medical Technology Co ltd
Current assignee: Shanghai Tuomai Medical Technology Co ltd
Priority date: 2021-12-14
Filing date: 2021-12-14
Publication date: 2023-06-16
Also published as: WO2023109315A1

Abstract

The present invention relates to a stent delivery device and a stent delivery system. The bracket conveying device comprises an inner pipe, an outer pipe, a limit sleeve and a release sleeve; the limiting sleeve and the release sleeve are sleeved outside the inner tube, the outer tube is sleeved outside the limiting sleeve and the release sleeve, and the limiting sleeve is positioned at the far end side of the release sleeve; the distal end of release sleeve is provided with the constraint silk, and the constraint silk is used for restraining the naked section of support in limit sleeve's outside, and release sleeve can be under the effect of external force near the proximal end motion of outer tube until the constraint silk removes the constraint to naked section. According to the stent conveying device, when the covered section of the stent is released in advance, the bare section is bound outside the limiting sleeve by the binding wire, so that the stent cannot be self-expanded, and the stent cannot jump forwards, so that the risk of blocking the portal vein branch can be reduced.

Description

Support conveying device and support conveying system

Technical Field

The invention relates to the technical field of medical equipment, in particular to a bracket conveying device and a bracket conveying system.

Background

The portal bypass operation (Transjugular Intrahepatic Portosystemic Shunt, TIPS) in the hepatic vein of the jugular vein is a minimally invasive treatment technology for establishing a portal-body bypass channel by implanting a bracket between the portal vein and the hepatic vein so as to reduce the portal vein pressure, and is used for treating related complications such as refractory ascites, esophageal and gastric varices rupture and bleeding caused by portal vein high pressure.

In the process of transjugular intrahepatic portosystemic shunt, a transjugular intrahepatic puncture is performed in advance to establish an artificial channel, and then the TIPS covered stent is conveyed and released at a target position along the channel, so that a portal-to-body shunt channel is established, and the effect of reducing the portal venous blood flow pressure is achieved. TIPS coated stents typically include a bare segment and a coated segment. Wherein the length of the bare segment is about 20mm, and the bare segment is used for being positioned in the portal vein to ensure that the blood perfusion of the portal vein to other branches is not affected; the length of the tectorial membrane section is about 40 mm-80 mm, and is used for being positioned in liver parenchyma, so that bile erosion is effectively prevented. The introducing route of the TIPS tectorial membrane stent system is as follows: the method comprises the steps of firstly entering a lower vena cava through a jugular vein access, then entering a hepatic vein through the lower vena cava, guiding out from a hepatic vein puncture port and entering a portal vein through a hepatic substance, integrally retracting the stent system after the stent system reaches a designated position until a gold developing ring at the juncture of a bare segment and a tectorial membrane segment coincides with the portal vein puncture port, releasing the stent tectorial membrane segment in the liver by an operating system, at the moment, the bare stent segment is still bound on a rear release device, and operating the rear release device after the stent tectorial membrane segment is completely released in the liver, so as to release the bare stent segment in the portal vein.

When the stent conveying device in the prior art releases the stent, a certain forward jump phenomenon can be avoided, the stent deviates from the expected position more or less after the stent is released, the TIPS coated stent is generally provided with a bare section with the length of 20mm, the bare section is released in advance and is 'floated' in a portal vein when released, the impact of portal vein blood flow is received, meanwhile, the radial supporting force of the coated section and the radial supporting force of the bare section are obviously different, and the coated section is subjected to the uneven extrusion force of liver essence when released, so that the stent is easy to shift, and if the coated section enters the portal vein, the risk of blocking the portal vein branch can be caused.

Disclosure of Invention

Based on this, it is necessary to provide a stent delivery device and a stent delivery system for solving the technical problem that the existing stent delivery device makes the TIP covered stent easily have the phenomenon of "forward jump".

A stent delivery device comprising: the device comprises an inner tube, an outer tube, a limit sleeve and a release sleeve;

the limiting sleeve and the release sleeve are sleeved outside the inner tube, the outer tube is sleeved outside the limiting sleeve and the release sleeve, and the limiting sleeve is positioned at the far end side of the release sleeve;

the distal end of the release sleeve is provided with a binding wire for binding the bare segment of the stent to the outside of the limiting sleeve, and the release sleeve can move towards the proximal end of the outer tube under the action of external force until the binding wire releases the binding of the bare segment.

Above-mentioned support conveyor, when clinically implanting the support, restraint silk can restrict the naked section of support in limit sleeve's outside to restraint the naked section, when advancing the tectorial membrane section of release support, naked section self just can't expand, and the support just can't "jump forward" yet, can effectively avoid the support because shift that "jump forward" leads to, and then can reduce the risk of blockking up portal vein branch, ensures the accurate release of support.

In one embodiment, the limiting sleeve is provided with a wire passing hole along the direction from the proximal end to the distal end, and the outer side wall of the limiting sleeve is provided with a limiting groove communicated with the wire passing hole;

the binding wire can be arranged in the wire passing hole in a penetrating mode and can be pulled out of the wire passing hole under the action of external force.

In one embodiment, the number of the wire passing holes, the limit grooves and the binding wires is multiple and corresponds to one another;

the wire passing holes and the limiting grooves are uniformly distributed along the circumferential direction of the limiting sleeve, and the binding wires are uniformly distributed along the circumferential direction of the releasing sleeve.

In one embodiment, the via is a blind via.

In one embodiment, the limit groove is in communication with the lumen of the limit sleeve.

In one embodiment, the limit groove is provided with 1 or more limit grooves in the axial direction.

In one embodiment, the outer side wall of the limit sleeve is provided with a plurality of limit grooves, and the limit grooves are uniformly distributed at intervals in the axial direction and the circumferential direction.

In one embodiment, a reinforcing part is formed at the proximal end of the limit sleeve, and the outer wall of the reinforcing part is of a friction-increasing structure;

and/or the outer wall of the release sleeve is of a friction-increasing structure.

In one embodiment, the stent delivery device further comprises a tapered guide head removably attached to the distal end port of the outer tube, the distal end of the inner tube being attached to the tapered guide head.

In one embodiment, the stent delivery device further comprises: a handle, an ejector head and an elastic member;

the handle is connected with the proximal end of the outer tube, the ejection head and the elastic piece are arranged in the outer tube, the distal end of the ejection head is used for being abutted with the proximal end of the bracket, and the two ends of the elastic piece are respectively connected with the handle and the ejection head;

the proximal end of the inner tube penetrates out of the top head to be connected with the handle.

In one embodiment, the distal end of the head is provided with a bracket mounting boss and/or the proximal end of the head is provided with a spring mounting boss.

In one embodiment, the spring mounting boss has a cannula aperture through which the proximal end of the inner tube extends to connect with the handle.

A stent delivery system comprising a stent and a stent delivery device as defined in any one of the preceding claims;

the binding wire of the stent conveying device is used for binding the bare segment of the stent to the outside of the limiting sleeve of the stent conveying device, and the release sleeve can move towards the proximal end of the outer tube under the action of external force until the binding wire releases the binding of the bare segment.

Above-mentioned support conveying system, when clinically implanting the support, the constraint silk can restrict the naked section of support in limit sleeve's outside to constraint naked section, when advancing the tectorial membrane section of release support, naked section self just can't expand, and the support just can't "jump forward" yet, can effectively avoid the support because shift that "jump forward" leads to, and then can reduce the risk of blockking up portal vein branch, ensures the accurate release of support.

Drawings

FIG. 1 is a schematic view of a partial structure of a stent delivery system according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a limiting sleeve according to an embodiment of the present invention;

FIG. 3 is a cross-sectional view of the stop collar shown in FIG. 2;

fig. 4 is a schematic structural view of a limiting sleeve according to another embodiment of the present invention;

FIG. 5 is a cross-sectional view of the stop collar shown in FIG. 4;

FIG. 6 is a schematic view of a release liner according to an embodiment of the present invention;

FIG. 7 is a schematic view of a partial structure of a bare segment according to an embodiment of the present invention;

fig. 8 to 11 are schematic views illustrating an implantation procedure of a stent delivery system according to an embodiment of the present invention;

fig. 12 is a schematic structural diagram of a head according to an embodiment of the present invention.

Wherein, the reference numerals in the specification and the drawings are as follows:

10. a rack conveyor; 100. an inner tube; 200. an outer tube; 300. a limit sleeve; 310. a wire passing hole; 320. a limit groove; 330. a lumen; 340. a reinforcing part; 400. releasing the sleeve; 410. binding wires; 420. releasing the wire; 500. a conical guide head; 600. a top head; 610. a bracket mounting boss; 620. an elastic member mounting boss; 630. a through hole; 700. an elastic member; 800. a bracket; 810. a bare segment; 811. a bracket section; 812. a vertex; 820. a film covering section; 830. a developing ring; a1, liver; a2, inferior vena cava; a3, hepatic right vein; a4, puncturing the channel; a5, portal vein.

Detailed Description

In order that the above objects, features and advantages of the invention will be readily understood, a more particular description of the invention will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the invention, whereby the invention is not limited to the specific embodiments disclosed below.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

It will be understood that when an element is referred to as being "fixed" or "disposed" on 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," "upper," "lower," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.

As shown in fig. 1, an embodiment of the present invention provides a stent delivery device 10, the stent delivery device 10 comprising: an inner tube 100, an outer tube 200, a stop collar 300, and a release collar 400; the limiting sleeve 300 and the releasing sleeve 400 are sleeved outside the inner tube 100, the outer tube 200 is sleeved outside the limiting sleeve 300 and the releasing sleeve 400, and the limiting sleeve 300 is positioned at the far end side of the releasing sleeve 400; as shown in fig. 6, the distal end of the release sleeve 400 is provided with a binding wire 410, the binding wire 410 being used to bind the bare segment 810 of the stent 800 to the outside of the stop sleeve 300, the release sleeve 400 being able to move towards the proximal end of the outer tube 200 under the influence of external force until the binding wire 410 unbinds the bare segment 810.

The distal end of each component of the stent delivery device refers to the end of the component that first enters the liver A1 of the patient, and the proximal end of each component of the stent delivery device refers to the end that is near the operator.

The stent delivery device is applied to the medical field and is used for delivering a medical stent to a lesion of a patient. The medical stent can be an intestinal stent, a vascular stent and other medical stents, wherein the vascular stent can be a stent only comprising a bare section, or a TIP (TIP-stent-graft) stent comprising a bare section and a covered section. Referring to fig. 1, the portion encircled by the dashed line in fig. 1 is a TIP covered stent 800, the length of the bare segment 810 is about 20mm, and the bare segment is sleeved outside the limiting sleeve 300 and is used for being positioned in a portal vein, so that the perfusion of the portal vein to blood of other branches is not affected; the length of the film-coated section 820 is about 40 mm-80 mm, and the film-coated section 820 is sleeved outside the release sleeve 400 and is used for being positioned in liver parenchyma to effectively prevent bile erosion, wherein a developing ring 830, such as a gold developing ring, is arranged at the juncture of the bare section 810 and the film-coated section 820. Specifically, referring to fig. 7, the bare segment 810 is of a mesh structure, including a plurality of stent segments 811 sequentially distributed in an axial direction, and apexes 812 of adjacent two stent segments 811 are interlocked; the stent 800 of the covered segment 820 comprises a plurality of stent segments distributed in sequence along the axial direction, and two adjacent stent segments are distributed at intervals and connected through a connecting rod. The material, structure and operation of the stent delivery device 10 will be described in detail below with reference to the TIP coated stent 800.

As an example, the inner tube 100, the outer tube 200, the stop collar 300 and the release collar 400 of the stent delivery device are plastic materials with bio-compatibility, safety and certain hardness, such as PE (polyethylene) materials, which can meet the requirement that the stent delivery device itself can bend correspondingly with the blood vessel during the implantation process. In addition, the inner tube 100, the outer tube 200, the stop collar 300, and the release collar 400 may be round tubes.

As an example, the binding wire 410 on the release sleeve 400 is a metallic material having bio-compatibility, safety and a certain hardness, such as nickel titanium.

The operation of the stent delivery device 10 will be described below with reference to fig. 8 to 11:

in use, TIP covered stent 800 is first assembled into a stent-receiving lumen formed between outer tube 200 and inner tube 100 of a stent delivery device. Specifically, the TIP covered stent 800 is first sleeved outside the inner tube 100 and the bare section 810 of the TIP covered stent 800 is aligned with the limiting sleeve 300; the tie-down wire 410 of the release sleeve 400 then ties the bare segment 810 to the exterior of the stop sleeve 300; thereafter, the outer tube 200 is sleeved outside the inner tube 100, and the stop collar 300, the release collar 400 and the TIP covered stent 800 are assembled into the outer tube 200. It should be noted that, gaps are formed between the walls of the stop collar 300, the release collar 400 and the outer tube 200, and the width of the gaps is greater than or equal to the wall thickness of the TIP covered stent 800 to accommodate the TIP covered stent 800.

Referring to fig. 8, upon clinical implantation, the stent delivery device 10 is introduced into the inferior vena cava A2 via the jugular vein access of the patient, is adjusted in direction, and is then introduced into the hepatic right vein A3, and is then introduced into the portal vein A5 through the artificial passageway established by pre-puncture.

Referring to fig. 9 and 10, after the stent delivery device 10 enters the designated position of the portal vein A5, the stent delivery device 10 is entirely retracted, and after the developing ring 830 of the TIP covered stent 800 is completely overlapped with the puncture of the portal vein A5, the retraction is stopped. The outer tube 200 is then withdrawn and the TIP covered stent 800 is stopped after it is completely released from the outer tube 200, at which point the covered segment 820 of the TIP covered stent 800 has been released into the puncture passageway A4 of the liver A1, but the bare segment 810 of the TIP covered stent 800 remains constrained to the exterior of the constraining sheath 300 by the constraining wire 410.

Referring to fig. 11, the release sheath 400 is then pulled toward the proximal end of the outer tube 200, the cinch wire 410 is withdrawn proximally along with the entire release sheath 400, the bare segment 810 is released from the cinch of the cinch wire 410, the bare segment 810 is released into the portal vein A5, and finally the stent delivery device is withdrawn from the human body.

Above-mentioned support conveyor, when clinically implanting support 800, constraint silk 410 can tie up the naked section 810 of support 800 in the outside of limit sleeve 300 to constraint naked section 810, when advancing tectorial membrane section 820 of releasing support 800 in advance, naked section 810 self can't expand, support 800 just also can't "jump forward", can effectively avoid support 800 because shift that "jump forward" leads to, and then can reduce the risk of blockking up portal vein A5 branch, ensure the accurate release of support 800.

In some embodiments of the present invention, referring to fig. 2 to 5, the limiting sleeve 300 is provided with a wire passing hole 310 along a direction from a proximal end to a distal end thereof, the outer sidewall of the limiting sleeve 300 is provided with a limiting groove 320 communicating with the wire passing hole 310, and the binding wire 410 may be inserted into the wire passing hole 310 and may be pulled out from the wire passing hole 310 under the action of external force. The binding wires 410 can be inserted through the wire holes 310 and the meshes of the bare segment 810, so that the bare segment 810 is bound in the limiting groove 320, and the bare segment 810 is bound. In this manner, the limiting groove 320 can radially accommodate a portion of the bare segment 810 without increasing the diameter of the outer tube 100.

The outer side wall of the stop collar 300 refers to a side wall of the stop collar 300 away from the axis thereof, and does not refer to the proximal end face and the distal end face of the stop collar 300.

In the present embodiment, as shown in fig. 2 to 5, the number of the wire passing holes 310, the limiting grooves 320 and the binding wires 410 is plural and corresponds to one another. The wire passing holes 310 and the limiting grooves 320 are uniformly distributed along the circumferential direction of the limiting sleeve 300, and the binding wires 410 are uniformly distributed along the circumferential direction of the releasing sleeve 400. In this manner, the respective vertices 812 of each stent segment 811 of the bare segment 810 may be effectively constrained. The number of the wire holes 310, the limiting grooves 320 and the binding wires 410 may be the same as the number of the vertices of each bracket 800, for example, if each bracket 811 has 6 vertices 812, the number of the wire holes 310, the limiting grooves 320 and the binding wires 410 may be 6; for another example, each bracket segment 811 has 12 vertices 812, and the number of wire vias 310, limit slots 320, and tie down wires 410 may all be 12.

In this embodiment, as shown in fig. 3 and 5, the via 310 is a blind hole, i.e., the via 310 penetrates the proximal end of the stop collar 300 and does not penetrate the distal end of the stop collar 300. In this manner, the wire 410 to be bound may be retained in the proximal end of the wire hole 310 after passing through the proximal end of the wire hole 310 and the mesh of the bare segment 810, and the bare segment 810 may be effectively bound.

In this embodiment, as shown in fig. 2 and 4, the limiting groove 320 communicates with the lumen 330 of the limiting sleeve 300. By such arrangement, the limit groove 320 can be ensured to have enough space to limit the bare segment 810, and whether the limit sleeve 300 and the inner tube 100 are assembled in place can be observed. Alternatively, the stop collar 300 may be integrally formed with the inner tube 100.

In the present embodiment, as shown in fig. 2 and 4, the number of the limiting grooves 320 is plural, and the plurality of limiting grooves 320 are uniformly spaced in the axial direction and the circumferential direction. A plurality of limiting grooves 320 are formed along the axial direction of the limiting sleeve 300 at intervals, and the strength of the limiting sleeve 300 can be ensured by a plurality of intermittent groove structures. Of course, in other embodiments, a limiting groove 320 may be continuously formed along the axial direction of the limiting sleeve 300, and a single continuous groove structure is convenient to be formed, so that the structure of the limiting groove 320 may be specifically set according to practical situations during application. It should be noted that, when the plurality of limiting grooves 320 are formed along the axial direction of the limiting sleeve 300, the distance between two adjacent limiting grooves 320 needs to be set according to the distance between two adjacent bracket segments 811 of the bare segment 810, otherwise, the bracket segments 811 of the bare segment 810 cannot be smoothly tied on the outer surface of the limiting sleeve 300. As an example, the spacing slots 320 may be distributed along the axial direction of the spacing sleeve 300, which may enable the binding wire 410 to limit the bare segment 810 in the spacing slots 320 with less force.

In some embodiments of the present invention, as shown in fig. 6, the proximal end of the release sleeve 400 is provided with a release wire 420, the release wire 420 being capable of pulling the release sleeve 400 under the action of an external force. After the TIP covered stent 800 is completely released from the outer tube 200, the release wire 420 is pulled, the binding wire 410 is retracted proximally along with the whole release sleeve 400, the bare segment 810 is released from the binding of the binding wire 410, and the bare segment 810 is released conveniently by the arrangement of the release wire 420. Wherein the wire diameter of the release wire 420 may be smaller than the wire diameter of the binder wire 410. Optionally, the release wire 420 is a metallic material with bio-compatibility, safety and certain hardness, such as nickel titanium material, stainless steel. As for the number of the release wires 420, specific settings may be made according to actual circumstances, for example, 1, 2, 3, etc.

In some embodiments of the present invention, as shown in fig. 2 to 5, a reinforcing portion 340 is formed at a proximal end of the stop collar 300, and an outer wall of the reinforcing portion 340 is a wear-enhancing structure; and/or the outer wall of the release sleeve 400 is a wear-enhancing structure. The reinforcement 340 may increase the strength of the limit sleeve 300; in addition, the friction effect between the outer surfaces of the reinforcing part 340 and the release sleeve 400 and the inner surface of the covered section 820 can be increased when the covered section 820 of the TIP stent covered 800 is released, so that a part of resistance can be provided for the release of the TIP covered stent 800, the phenomenon of 'forward jump' during the release of the TIP covered stent 800 can be effectively weakened, and the accurate release position of the TIP covered stent 800 is ensured. It will be appreciated that the wire vias 310 extend through to the proximal end face of the reinforcement 340.

Optionally, the abrasive enhancing structure is a frosted structure. Of course, in other embodiments, a plurality of protrusions may be provided on the outer wall of the reinforcing portion 340 and the release sleeve 400 to form a friction enhancing structure.

As shown in fig. 1, the stent delivery device further comprises a tapered guide 500 detachably connected to the distal end port of the outer tube 200, and the distal end of the inner tube 100 is connected to the tapered guide 500. The tapered guide 500 may serve as a guide during implantation of the stent delivery device. Optionally, tapered guide 500 is fitted to the outer tube 200 at the distal port by way of an interference fit, thus facilitating withdrawal of the outer tube 200.

As shown in fig. 1, the stent delivery device 10 further includes: a handle (not shown in the drawings), an ejector 600, and an elastic member 700; the handle is connected with the proximal end of the outer tube 200, the ejection head 600 and the elastic element 700 are arranged in the outer tube 200, the distal end of the ejection head 600 is used for being abutted with the proximal end of the bracket 800, and the two ends of the elastic element 700 are respectively connected with the handle and the ejection head 600; the proximal end of the inner tube 100 is connected to the handle through an ejector head 600. When the outer tube 200 is withdrawn, the proximal end of the covered segment 820 is "pushed" out of the outer tube 200 by the obstruction of the distal end of the ejector head 600, and stops after the TIP covered stent 800 has been completely released from the outer tube 200, at which point the covered segment 820 has been released into the puncture passageway A4 of the liver A1. As an example, the ejector head 600 is provided with a through hole 630 in a direction from a proximal end to a distal end thereof, and the through hole 630 is used to walk the release wire 420. Wherein the through holes 630 may be distributed along the axial direction of the ejector 600.

Alternatively, the elastic member 700 may be a spring, which can be primarily intended to facilitate the adaptation of the front end of the stent delivery device to a curved vessel. As shown in fig. 12, the proximal end of the ejector 600 is provided with an elastic member mounting boss 620, and the distal end of the elastic member 700 may be sleeved on the elastic member mounting boss 620. The spring mounting boss 620 has a straw hole through which the proximal end of the inner tube 100 passes to connect with the handle. The proximal end of the inner tube 100 passes out of the spring mounting boss 620 and then out of the spring 700 to connect with the handle.

Optionally, the distal end of the ejector head 600 is provided with a bracket mounting boss 610. The proximal end of the stent graft section 820 of the TIP stent graft 800 is sleeved outside of the stent mounting boss 610.

In other embodiments, the distal end of the release sleeve 400 is provided with a binding wire 410, the outer diameter of the release sleeve 400 being larger than the outer diameter of the stop sleeve 300, such that the binding wire 410 may bind the bare segment of the stent to the outside of the stop sleeve.

Another embodiment of the present invention provides a stent delivery system comprising a stent 800 and any of the above to the stent delivery device 10; the binding wire 410 of the stent delivery device 10 is used to bind the bare segment 810 of the stent 800 to the exterior of the stop collar 300 of the stent delivery device 10, and the release collar 400 can be moved toward the proximal end of the outer tube 200 under the force of the external force until the binding wire 410 unbundles the bare segment 810.

As an example, the stent may be a medical stent such as an intestinal stent, a vascular stent, or the like, where the vascular stent may be a stent including only a bare segment, or a TIP stent including a bare segment and a stent. Referring to fig. 1, the portion encircled by the dashed line in fig. 1 is a TIP covered stent 800, the length of the bare segment 810 is about 20mm, and the bare segment is sleeved outside the limiting sleeve 300 and is used for being positioned in a portal vein, so that the perfusion of the portal vein to blood of other branches is not affected; the length of the film-coated section 820 is about 40 mm-80 mm, and the film-coated section 820 is sleeved outside the release sleeve 400 and is used for being positioned in liver parenchyma to effectively prevent bile erosion, wherein a developing ring 830, such as a gold developing ring, is arranged at the juncture of the bare section 810 and the film-coated section 820. Specifically, referring to fig. 7, the bare segment 810 is of a mesh structure, including a plurality of stent segments 811 sequentially distributed in an axial direction, and apexes 812 of adjacent two stent segments 811 are interlocked; the stent 800 of the covered segment 820 comprises a plurality of stent segments distributed in sequence along the axial direction, and two adjacent stent segments are distributed at intervals and connected through a connecting rod.

Above-mentioned support 800 conveying system, when clinically implanting support 800, constraint silk 410 can tie up the naked section 810 of membrane support 800 in the outside of limit sleeve 300 to tie up naked section 810, when advancing the tectorial membrane section 820 of releasing support 800, naked section 810 just can't self-expanding, support 800 just also can ' skip forward ', can effectively avoid support 800 because the shift that "skip forward" leads to, and then can reduce the risk of blockking up portal vein A5 branch, ensure the accurate release of support 800.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.

Claims

1. A stent delivery device, comprising: an inner tube (100), an outer tube (200), a limit sleeve (300) and a release sleeve (400);

the limiting sleeve (300) and the releasing sleeve (400) are sleeved outside the inner tube (100), the outer tube (200) is sleeved outside the limiting sleeve (300) and the releasing sleeve (400), and the limiting sleeve (300) is positioned at the far end side of the releasing sleeve (400);

the distal end of the release sleeve (400) is provided with a binding wire (410), the binding wire (410) is used for binding a bare section (810) of a stent (800) outside the limit sleeve (300), and the release sleeve (400) can move towards the proximal end of the outer tube (200) under the action of external force until the binding wire (410) releases the binding of the bare section (810).

2. The stent delivery device according to claim 1, wherein the limiting sleeve (300) is provided with a wire passing hole (310) along the direction from the proximal end to the distal end, and a limiting groove (320) communicated with the wire passing hole (310) is formed on the outer side wall of the limiting sleeve (300);

the binding wire (410) can be inserted into the wire passing hole (310) and can be pulled out of the wire passing hole (310) under the action of external force.

3. The stent delivery device of claim 2, wherein the number of wire holes (310), the limiting grooves (320), and the binding wires (410) is plural and corresponds one to one;

the wire passing holes (310) and the limiting grooves (320) are uniformly distributed along the circumferential direction of the limiting sleeve (300), and the binding wires (410) are uniformly distributed along the circumferential direction of the releasing sleeve (400).

4. The stent delivery device of claim 2, wherein the wire-passing holes (310) are blind holes.

5. The stent delivery device of claim 2, wherein the limiting groove (320) communicates with a lumen (330) of the limiting sleeve (300).

6. The stent delivery device according to claim 2, wherein the outer sidewall of the stopper sleeve (300) is provided with a plurality of stopper grooves (320), and the plurality of stopper grooves (320) are uniformly spaced apart in the axial direction and the circumferential direction.

7. The stent delivery device according to claim 1, wherein the proximal end of the release sleeve (400) is provided with a release wire (420), the release wire (420) being capable of pulling the release sleeve (400) into movement under the influence of an external force.

8. The stent delivery device of claim 1, wherein a proximal end of the stop collar (300) is formed with a reinforcement portion (340), an outer wall of the reinforcement portion (340) being of a friction enhancing structure;

and/or, the outer wall of the release sleeve (400) is a friction-increasing structure.

9. The stent delivery device according to any one of claims 1-8, the stent delivery device (10) further comprising a tapered guide head (500) removably connected to the distal end port of the outer tube (200), the distal end of the inner tube (100) being connected to the tapered guide head (500).

10. The stent delivery device according to any one of claims 1-8, the stent delivery device (10) further comprising: a handle, a head (600) and an elastic member (700);

the handle is connected with the proximal end of the outer tube (200), the ejection head (600) and the elastic piece (700) are arranged in the outer tube (200), the distal end of the ejection head (600) is used for being abutted with the proximal end of the bracket (800), and the two ends of the elastic piece (700) are respectively connected with the handle and the ejection head (600);

the proximal end of the inner tube (100) passes through the top head (600) to be connected with the handle.

11. The stent delivery device of claim 10, wherein a distal end of the tip head (600) is provided with a stent mounting boss (610) and/or a proximal end of the tip head (600) is provided with a spring mounting boss (620).

12. The stent delivery system of claim 11, wherein the spring mounting boss (620) has a straw aperture through which the proximal end of the inner tube (100) passes for connection with the handle.

13. A stent delivery system comprising a stent (800) and a stent delivery device (10) according to any one of claims 1 to 12;

the binding wire (410) of the stent delivery device (10) is used for binding the bare segment (810) of the stent (800) to the outside of the stop sleeve (300) of the stent delivery device (10), and the release sleeve (400) can move towards the proximal end of the outer tube (200) under the action of external force until the binding wire (410) unbinds the bare segment (810).