WO2023109315A1

WO2023109315A1 - Stent delivery device and stent delivery system

Info

Publication number: WO2023109315A1
Application number: PCT/CN2022/126976
Authority: WO
Inventors: 曹洋; 张宇; 王金耀; 高凌岳; 朱清
Original assignee: 上海拓脉医疗科技有限公司
Priority date: 2021-12-14
Filing date: 2022-10-24
Publication date: 2023-06-22
Also published as: CN116262078A

Abstract

A stent delivery device (10) and a stent delivery system. The stent delivery device (10) comprises an inner tube (100), an outer tube (200), a restraining sheath (300), and a release sheath (400). The restraining sheath (300) and the release sheath (400) sleeve the inner tube (100), the outer tube (200) sleeves the restraining sheath (300) and the release sheath (400), and the restraining sheath (300) is located on the distal end side of the release sheath (400). The distal end of the release sheath (400) is provided with restraining wires (410), the restraining wires (410) being used for restraining a bare section (810) of a stent (800) outside the restraining sheath (300). The release sheath (400) is configured to move towards the proximal end of the outer tube (200) under an external force until the restraining wires (410) no longer restrain the bare section (810).

Description

Stent delivery device and stent delivery system

Cross References to Related Applications

This application claims the priority of the Chinese patent application with application number 202111528102.7 and titled "Stent delivery device and stent delivery system" submitted to the China Patent Office on December 14, 2021, which is hereby incorporated by reference in its entirety.

technical field

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

Background technique

Transjugular Intrahepatic Portosystemic Shunt (TIPS) is a minimally invasive treatment technique that implants a stent between the portal vein and the hepatic vein to establish a portosystemic shunt channel to reduce portal vein pressure. Treatment of related complications such as intractable ascites, rupture and bleeding of esophageal and gastric varices caused by portal hypertension.

In transjugular intrahepatic portosystemic shunt, it is necessary to perform transjugular intrahepatic puncture in advance to establish an artificial channel, and then deliver and release the TIPS-covered stent along the channel to establish a portosystemic shunt channel. In order to achieve the effect of reducing portal venous blood pressure. A TIPS covered stent usually includes a bare segment and a covered segment. Among them, the length of the bare segment is about 20mm, which is used for positioning in the portal vein, so as to ensure that the blood perfusion of the portal vein to other branches is not affected; Prevent bile erosion. The introduction path of the TIPS covered stent system is: first enter the inferior vena cava through the jugular vein, then enter the hepatic vein through the inferior vena cava, and then lead out from the puncture port of the hepatic vein and enter the portal vein after passing through the liver parenchyma. After positioning, withdraw the stent system as a whole until the golden developing ring at the junction of the bare segment and the covered segment coincides with the puncture port of the portal vein, and the operating system releases the covered segment of the stent in the liver. At this time, the bare stent segment is still bound in the liver. On the post-release device, after the covered segment of the stent is completely released in the liver, the post-release device is operated to release the bare stent segment into the portal vein.

When the stent delivery device in the prior art releases the stent, there will inevitably be a certain "jump forward" phenomenon, and the stent will more or less deviate from the expected position after the stent is released, while the TIPS covered stent generally has a bare During the release, the bare segment has been released in advance and "floats" in the portal vein, and is impacted by the blood flow of the portal vein. At the same time, there is a significant difference in the radial support force between the covered segment and the bare segment, and the covered segment is released when it is released. Due to the uneven extrusion force of the liver parenchyma, the stent is prone to displacement. If the covered segment enters the portal vein, it will cause the risk of blocking the portal vein branch.

Contents of the invention

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

A stent delivery device is used to deliver a stent, comprising: an inner tube, an outer tube, a limiting sleeve and a releasing sleeve.

The limit sleeve and the release sleeve are sleeved on the outside of the inner tube, the outer tube is sleeved on the outside of the limit sleeve and the release sleeve, and the limit sleeve Located on the distal side of the release sleeve.

The distal end of the release sleeve is provided with a binding wire, and the binding wire is used to bind the bare section of the stent to the outside of the limit sleeve, and the release sleeve is arranged to move towards the position under the action of external force. The proximal end of the outer tube is moved until the binding wire releases the binding of the bare segment.

The above-mentioned stent delivery device, when the stent is clinically implanted, the binding wire can bind the bare section of the stent to the outside of the limiting sleeve, thereby binding the bare section, and when the covered section of the stent is first released, the bare section itself will Unable to self-expand, the stent cannot "jump forward", which can effectively avoid the displacement of the stent due to "jump forward", thereby reducing the risk of blocking the portal vein branch and ensuring the precise release of the stent.

In one of the embodiments, the limiting sleeve is provided with a wire passing hole along the direction from its proximal end to the distal end, and the outer side wall of the limiting sleeve is provided with a limiting groove communicating with the wire passing hole .

The binding wire can pass through the wire passing hole and is configured to be able to be pulled out from the wire passing hole under the action of an external force.

In one of the embodiments, there are multiple wire passing holes, the limiting grooves, and the binding wires in one-to-one correspondence.

The thread passing holes and the limiting grooves are evenly distributed along the circumferential direction of the limiting sleeve, and the binding wires are evenly distributed along the circumferential direction of the releasing sleeve and extend in the axial direction.

In one embodiment, the wire hole is a blind hole.

In one of the embodiments, the limiting groove communicates with the lumen of the limiting sleeve.

In one of the embodiments, one or more limiting grooves are provided in the axial direction.

In one of the embodiments, the outer wall of the limiting sleeve is respectively provided with a plurality of limiting grooves in the axial and circumferential directions, and the plurality of limiting grooves are evenly spaced in the axial and circumferential directions. .

In one of the embodiments, the proximal end of the release sleeve is provided with a release wire, and the release wire is configured to be able to pull the release sleeve to move under the action of an external force.

In one of the embodiments, a reinforcing part is formed at the proximal end of the limiting sleeve, and an outer wall of at least one of the reinforcing part and the releasing sleeve is a wear-increasing structure.

In one of the embodiments, the stent delivery device further includes a tapered guide detachably connected to the port at the distal end of the outer tube, and the distal end of the inner tube is connected to the tapered guide.

In one of the embodiments, the stent delivery device further includes: a handle, an ejection head, and an elastic member.

The handle is connected to the proximal end of the outer tube, the ejector head and the elastic member are arranged in the outer tube, the distal end of the ejector head is used to abut against the proximal end of the bracket, the Both ends of the elastic member are respectively connected with the handle and the ejector head.

The proximal end of the inner tube passes through the ejector head and is connected with the handle.

In one of the embodiments, the distal end of the ejector head is provided with a bracket installation boss, and/or the proximal end of the ejector head is provided with an elastic member installation boss.

In one of the embodiments, the installation boss of the elastic member has a tube hole, and the proximal end of the inner tube passes through the tube hole to connect with the handle.

In one embodiment, the bare segment is a mesh structure, including a plurality of stent segments distributed sequentially along the axial direction, and the vertices of two adjacent stent segments are interlocked.

In one of the embodiments, the number of the wire passing holes, the number of the binding wires, and the number of the limit slots in the circumferential direction are the same as the number of vertices of each stent segment.

A stent delivery system, comprising a stent and a stent delivery device as described above.

The above-mentioned stent delivery system, when the stent is clinically implanted, the binding wire can bind the bare section of the stent to the outside of the limiting sleeve, thereby binding the bare section. When the covered section of the stent is released first, the bare section itself Unable to self-expand, the stent cannot "jump forward", which can effectively avoid the displacement of the stent due to "jump forward", thereby reducing the risk of blocking the portal vein branch and ensuring the precise release of the stent.

Description of drawings

Fig. 1 is a partial structural schematic diagram of a stent delivery system provided by an embodiment of the present invention;

Fig. 2 is a schematic structural diagram of a limit sleeve provided by an embodiment of the present invention;

Fig. 3 is a sectional view of the limit sleeve shown in Fig. 2;

Fig. 4 is a schematic structural diagram of a limit sleeve provided by another embodiment of the present invention;

Fig. 5 is a sectional view of the limit sleeve shown in Fig. 4;

Fig. 6 is a schematic structural diagram of a release sleeve provided by an embodiment of the present invention;

FIG. 7 is a schematic diagram of a partial structure of a bare segment provided by an embodiment of the present invention;

8 to 11 are schematic diagrams of the implantation process of the stent delivery system provided by an embodiment of the present invention;

Fig. 12 is a schematic structural diagram of an ejector head provided by an embodiment of the present invention.

Wherein, the label description in the accompanying drawings of the description is as follows:

10, frame conveying device; 100, inner tube; 200, outer tube; 300, limit sleeve; 310, wire hole; 320, limit groove; 330, lumen; 340, reinforcement; 400, release sleeve ; 410, binding wire; 420, release wire; 500, tapered guide head; 600, ejection head; 610, bracket installation boss; 620, elastic member installation boss; 630, through hole; 700, elastic member; 800, Stent; 810, bare segment; 811, stent segment; 812, apex; 820, covered segment; 830, developing ring; A1, liver; A2, inferior vena cava; A3, right hepatic vein; A4, puncture channel; A5, portal vein.

Detailed ways

In order to make the above objects, features and advantages of the present invention more comprehensible, specific implementations of the present invention will be described in detail below in conjunction with the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. However, the present invention can be implemented in many other ways different from those described here, and those skilled in the art can make similar improvements without departing from the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

In describing the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", " Back", "Left", "Right", "Vertical", "Horizontal", "Top", "Bottom", "Inner", "Outer", "Clockwise", "Counterclockwise", "Axial" , "radial", "circumferential" and other indicated orientations or positional relationships are based on the orientations or positional relationships shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying the referred device or Elements must have certain orientations, be constructed and operate in certain orientations, and therefore should not be construed as limitations on the invention.

In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be interpreted as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include at least one of these features. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

In the present invention, unless otherwise clearly specified and limited, terms such as "installation", "connection", "connection" and "fixation" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection , or integrated; it may be mechanically connected or electrically connected; it may be directly connected or indirectly connected through an intermediary, and it may be the internal communication of two components or the interaction relationship between two components, unless otherwise specified limit. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention according to specific situations.

In the present invention, unless otherwise clearly specified and limited, the first feature may be in direct contact with the first feature or the first and second feature may be in direct contact with the second feature through an intermediary. touch. Moreover, "above", "above" and "above" the first feature on the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. "Below", "beneath" and "beneath" the first feature may mean that the first feature is directly below or obliquely below the second feature, or simply mean that the first feature is less horizontally than the second feature.

It should be noted that when an element is referred to as being “fixed on” or “disposed on” another element, it may be directly on the other element or there may be an intervening element. 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. As used herein, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions are for the purpose of illustration only and are not intended to represent the only embodiments.

As shown in Figure 1, an embodiment of the present invention provides a stent delivery device 10, the stent delivery device 10 includes: an inner tube 100, an outer tube 200, a limiting sleeve 300 and a releasing sleeve 400; the limiting sleeve 300 . The release sleeve 400 is sleeved on the outside of the inner tube 100 . The outer tube 200 is sleeved on the outside of the limiting sleeve 300 and the release sleeve 400 . The limiting sleeve 300 is located at the distal side of the release sleeve 400 . As shown in Figure 6, the distal end of the release sleeve 400 is provided with a binding wire 410, the binding wire 410 is used to bind the bare section 810 of the stent 800 to the outside of the limiting sleeve 300, the release sleeve 400 can be used under the action of external force Move downward toward the proximal end of the outer tube 200 until the tethering wire 410 unconstrains the bare segment 810 .

It should be noted that the distal end of each component of the stent delivery device refers to the end of the components first entering the patient's liver A1, and the proximal end of each component of the stent delivery device refers to the end close to the operator.

The stent delivery device is applied in the medical field, and is used to deliver the medical stent to the diseased part of the patient. The medical stent can be a medical stent such as an intestinal stent, a vascular stent, and the vascular stent can be a stent 800 including only a bare section 810 , or a TIP covered stent 800 including a bare section 810 and a covered section 820 . Referring to Fig. 1, the part circled by the dotted line in Fig. 1 is the TIP covered stent 800, the length of the bare section 810 is about 20mm, and it is sleeved on the outside of the position-limiting sleeve 300 for positioning in the portal vein to ensure Branch blood perfusion is not affected. The covered section 820 has a length of about 40 mm to 80 mm and is sheathed outside the release sleeve 400 for positioning in the liver parenchyma to effectively prevent bile erosion. Ring 830, such as a gold developer ring. Specifically, referring to FIG. 7 , the bare segment 810 is a mesh structure, including a plurality of stent segments 811 distributed sequentially along the axial direction, and the vertices 812 of two adjacent stent segments 811 are interlocked. The stent 800 including the covering segment 820 includes a plurality of stent segments distributed sequentially along the axial direction, and two adjacent stent segments are distributed at intervals and connected by connecting rods. The material, structure and working process of the stent delivery device 10 will be described below taking the TIP stent graft 800 as an example.

As an example, the inner tube 100, outer tube 200, limit sleeve 300 and release sleeve 400 of the stent delivery device are plastic materials with biodegradability, safety and certain hardness, such as PE (Polyethene, polyethylene ) material, which can meet the requirement that the stent delivery device itself can be bent correspondingly with the blood vessel during the implantation process. In addition, the inner tube 100, the outer tube 200, the limiting sleeve 300 and the releasing sleeve 400 can all be circular tubes.

As an example, the tethering wire 410 on the release sleeve 400 is made of biodescriptive, safe and hard metal, such as nickel-titanium.

The working process of the stent delivery device 10 will be described below with reference to FIGS. 8 to 11 .

In application, the TIP covered stent 800 is first assembled into the stent accommodating cavity formed between the outer tube 200 and the inner tube 100 of the stent delivery device. Specifically, the TIP stent-graft 800 is placed outside the inner tube 100 and the bare section 810 of the TIP stent-graft 800 is aligned with the limit sleeve 300; then the binding wire 410 of the sleeve 400 is released and the bare section 810 bound to the outside of the limiting sleeve 300 ; then the outer tube 200 is placed outside the inner tube 100 , and the limiting sleeve 300 , the releasing sleeve 400 and the TIP stent graft 800 are all assembled into the outer tube 200 . It should be noted that there is a gap between the walls of the limiting sleeve 300, the release sleeve 400 and the outer tube 200, and the width of the gap is greater than or equal to the wall thickness of the TIP stent graft 800 to accommodate the TIP graft. Bracket 800.

Referring to FIG. 8 , during clinical implantation, the stent delivery device 10 enters the inferior vena cava A2 through the patient's jugular vein approach, adjusts its direction, enters the right hepatic vein A3, and then introduces the portal vein A5 through the artificial channel established by puncture in advance.

9 and 10, after the stent delivery device 10 enters the designated position of the portal vein A5, the stent delivery device 10 is withdrawn as a whole, and the withdrawal is stopped when the developing ring 830 of the TIP covered stent 800 completely overlaps with the puncture port of the portal vein A5. Then withdraw the outer tube 200, and stop after the TIP covered stent 800 is completely released from the outer tube 200. At this time, the covered segment 820 of the TIP covered stent 800 has been released in the puncture channel A4 of the liver A1, but The bare section 810 of the TIP stent-graft 800 is still bound by the binding wire 410 to the outside of the limiting sleeve 300 .

Referring to FIG. 11 , the release sleeve 400 is then pulled towards the proximal end of the outer tube 200, the binding wire 410 is withdrawn to the proximal end as a whole following the release sleeve 400, the bare section 810 is freed from the binding of the binding wire 410, and the bare section 810 is released in the portal vein A5, and finally, the stent delivery device 10 is withdrawn from the human body.

In the above-mentioned stent delivery device, when the stent 800 is clinically implanted, the binding wire 410 can bind the bare section 810 of the stent 800 to the outside of the limiting sleeve 300 , thereby binding the bare section 810 . When the coated section 820 of the stent 800 is released first, the bare section 810 cannot self-expand and expand, and the stent 800 cannot "jump forward", which can effectively avoid the displacement of the stent 800 due to "jump forward". Reduce the risk of blocking the A5 branch of the portal vein, and ensure accurate release of the stent 800 .

In some embodiments of the present invention, referring to FIG. 2 to FIG. 5 , the limit sleeve 300 is provided with a wire passing hole 310 along the direction from its proximal end to the distal end, and the outer wall of the limit sleeve 300 is provided with a thread passing hole 310 . The hole 310 communicates with the limiting groove 320 , and the binding wire 410 can pass through the wire passing hole 310 and can be pulled out from the wire passing hole 310 under the action of an external force. The binding wire 410 can pass through the wire hole 310 and the mesh of the bare section 810 , so as to bind the bare section 810 in the limiting groove 320 , and further play the role of binding the bare section 810 . In this way, the limiting groove 320 can accommodate a part of the bare section 810 in the radial direction without increasing the diameter of the outer tube 100 .

It should be noted that the outer wall of the limiting sleeve 300 refers to the side wall of the limiting sleeve 300 parallel to its own axis, not the proximal and distal end surfaces of the limiting sleeve 300 .

In this embodiment, as shown in FIG. 2 to FIG. 5 , there are multiple wire passing holes 310 , limiting grooves 320 and binding wires 410 , which correspond to each other. The wire passing holes 310 and the limiting grooves 320 are evenly distributed along the circumferential direction of the limiting sleeve 300 , and the binding wires 410 are evenly distributed along the circumferential direction of the releasing sleeve 400 and extend along the axial direction. In this way, each vertex 812 of each stent segment 811 of the bare segment 810 can be effectively constrained. The number of thread passing holes 310, binding wires 410, and limit grooves 320 in the circumferential direction may be the same as the number of vertices 812 of each bracket segment 811. For example, if each bracket segment 811 has 6 vertices 812, Then, the number of thread passing holes 310 , binding wires 410 , and the limiting slots 320 in one circle in the circumferential direction can all be six. As another example, each bracket segment 811 has 12 vertices 812 , so the number of thread passing holes 310 , binding wires 410 , and limiting slots 320 in the circumferential direction can all be 12.

In this embodiment, as shown in FIG. 3 and FIG. 5 , the wire passing hole 310 is a blind hole, that is, the wire passing hole 310 penetrates the proximal end of the limiting sleeve 300 but does not penetrate the distal end of the limiting sleeve 300 . In this way, after passing through the proximal end of the thread passing hole 310 and the mesh of the bare section 810 , the binding wire 410 can be confined in the proximal end of the thread passing hole 310 , and the bare section 810 can be effectively bound.

In this embodiment, as shown in FIG. 2 and FIG. 4 , the limiting groove 320 communicates with the lumen 330 of the limiting sleeve 300 . Such arrangement can not only ensure that the limiting groove 320 has enough space to limit the bare section 810, but also can observe whether the limiting sleeve 300 and the inner tube 100 are assembled in place. Optionally, the limiting sleeve 300 and the inner tube 100 can be integrally formed.

In this embodiment, as shown in FIG. 2 and FIG. 4 , there are multiple limiting grooves 320 , and the plurality of limiting grooves 320 are evenly spaced in the axial and circumferential directions. A plurality of limiting grooves 320 are provided at intervals along the axial direction of the limiting sleeve 300 , and the structure of multiple discontinuous grooves can ensure the strength of the limiting sleeve 300 . Of course, in some other embodiments, a limit groove 320 can also be continuously opened along the axial direction of the limit sleeve 300. The single continuous groove structure is convenient to open, and the structure of the limit groove 320 can be adjusted according to the actual situation during application. Make specific settings. It should be noted that when multiple limiting grooves 320 are provided along the axial direction of the limiting sleeve 300, the distance between two adjacent limiting grooves 320 needs to be determined according to the distance between two adjacent bracket segments 811 of the bare segment 810. Otherwise, the bracket segment 811 of the bare segment 810 cannot be smoothly bound on the outer surface of the limiting sleeve 300 . As an example, the limiting grooves 320 may be distributed along the axial direction of the limiting sleeve 300 , so that the binding wire 410 can limit the bare section 810 in the limiting grooves 320 with less force.

In some embodiments of the present invention, as shown in FIG. 6 , a release wire 420 is provided at the proximal end of the release sleeve 400 , and the release wire 420 can pull the release sleeve 400 to move 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, and the tie wire 410 is retracted proximally along with the release sleeve 400 as a whole, and the bare section 810 is released from the bondage of the tie wire 410. The release of the bare segment 810 is facilitated by the arrangement of the release wire 420 . Wherein, the wire diameter of the releasing wire 420 may be smaller than that of the binding wire 410 . Optionally, the release wire 420 is made of a metal material with biodegradability, safety and certain hardness, such as nickel-titanium material, stainless steel. The number of release wires 420 can be specifically set according to actual conditions, for example, 1, 2, 3, etc. are set.

In some embodiments of the present invention, as shown in FIGS. 2 to 5 , a reinforced portion 340 is formed at the proximal end of the limiting sleeve 300 , and the outer wall of the reinforced portion 340 is a wear-increasing structure; and/or, the release sleeve 400 The outer wall is a wear-increasing structure. The reinforcement part 340 can increase the strength of the limiting sleeve 300; in addition, the increased wear structure on the reinforcement part 340 and the release sleeve 400 can increase the strength of the reinforcement part 340 when the coating section 820 of the TIP stent coating 800 is released. And the friction between the outer surface of the release sleeve 400 and the inner surface of the covered section 820 can provide a part of resistance to the release of the TIP covered stent 800, which can effectively weaken the "forward jump" phenomenon when the TIP covered stent 800 is released, ensuring The release position of the TIP stent graft 800 is precise. It can be understood that the wire hole 310 penetrates to the proximal end surface of the reinforcement part 340 .

Optionally, the abrasive structure is a frosted structure. Certainly, in some other embodiments, a plurality of protrusions may also be provided on the outer walls of the reinforcement part 340 and the release sleeve 400 to form a wear-increasing structure.

As shown in FIG. 1 , the stent delivery device 10 further includes a tapered guide 500 detachably connected to the distal 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 head 500 can play a guiding role during the implantation process of the stent delivery device. Optionally, the tapered guide head 500 is fitted to the distal port of the outer tube 200 through an interference fit, which facilitates the retraction of the outer tube 200 .

As shown in Figure 1, the stent delivery device 10 also includes: a handle (not shown in the drawings), an ejection head 600 and an elastic member 700; the handle is connected to the proximal end of the outer tube 200, and the ejection head 600 and the elastic member 700 are arranged on Inside the outer tube 200, the distal end of the ejection head 600 is used to abut against the proximal end of the bracket 800, and the two ends of the elastic member 700 are respectively connected to the handle and the ejection head 600; the proximal end of the inner tube 100 passes through the ejection head 600 and the handle connect. When the outer tube 200 is withdrawn, the proximal end of the covering segment 820 is hindered by the distal end of the ejection head 600 and is "pushed" out of the outer tube 200. After the TIP covered stent 800 is completely released from the outer tube 200, it stops. , the covering segment 820 has been released in the puncture channel A4 of the liver A1. As an example, the ejection head 600 is provided with a through hole 630 along the direction from the proximal end to the distal end thereof, and the through hole 630 is used for releasing the release wire 420 . Wherein, the through holes 630 may be distributed along the axial direction of the ejection head 600 .

Optionally, the elastic member 700 may be a spring, and the elastic member is mainly to facilitate the front end of the stent delivery device to adapt to a curved blood vessel. Wherein, as shown in FIG. 12 , the proximal end of the ejector head 600 is provided with an elastic member installation boss 620 , and the distal end of the elastic member 700 can be sleeved on the elastic member installation boss 620 . The elastic member installation boss 620 has a tube hole, and the proximal end of the inner tube 100 passes through the tube hole to be connected with the handle. The proximal end of the inner tube 100 passes through the elastic member installation boss 620, and then passes through the elastic member 700 to be connected with the handle.

Optionally, the distal end of the ejection head 600 is provided with a bracket installation boss 610 . The proximal end of the covered segment 820 of the TIP covered stent 800 is sleeved on the outside of the bracket installation boss 610 .

In other embodiments, the distal end of the release sleeve 400 is provided with a binding wire 410, and the outer diameter of the release sleeve 400 is larger than the outer diameter of the limiting sleeve 300, so that the binding wire 410 can bind the bare segment of the stent in a limited position. outside of the casing.

Another embodiment of the present invention provides a stent delivery system, which includes a stent 800 and any one of the above-mentioned stent delivery devices 10 . The binding wire 410 of the stent delivery device 10 is used to bind the bare section 810 of the stent 800 to the outside of the limit 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. Move until the tethering wire 410 unbinds the bare segment 810 .

As an example, the stent may be a medical stent such as an intestinal stent or a blood vessel stent, wherein the blood vessel stent may be a stent including only a bare segment, or a TIP covered stent including a bare segment and a covered segment. Referring to Fig. 1, the part circled by the dotted line in Fig. 1 is the TIP covered stent 800, the length of the bare section 810 is about 20mm, and it is sleeved on the outside of the position-limiting sleeve 300 for positioning in the portal vein to ensure Branch blood perfusion is not affected. The covered section 820 has a length of about 40 mm to 80 mm and is sheathed outside the release sleeve 400 for positioning in the liver parenchyma to effectively prevent bile erosion. Ring 830, such as a gold developer ring. Specifically, referring to FIG. 7 , the bare segment 810 is a mesh structure, including a plurality of stent segments 811 distributed sequentially along the axial direction, and the vertices 812 of two adjacent stent segments 811 are interlocked; the stent 800 of the covered segment 820 includes A plurality of stent segments are distributed sequentially along the axial direction, and two adjacent stent segments are distributed at intervals and connected by connecting rods.

The stent 800 delivery system mentioned above, when the stent 800 is clinically implanted, the tethering wire 410 can bind the bare section 810 of the membrane stent 800 to the outside of the spacer sleeve 300, thereby constraining the bare section 810, and releasing the stent 800 first. When the coated section 820 is used, the bare section 810 cannot self-expand, and the stent 800 cannot "jump forward", which can effectively avoid the displacement of the stent 800 due to "jump forward", thereby reducing the chance of blocking the A5 branch of the portal vein. risk, ensure accurate release of the stent 800.

The technical features of the above-mentioned embodiments can be combined arbitrarily. To make the description concise, all possible combinations of the technical features in the above-mentioned embodiments are not described. However, as long as there is no contradiction in the combination of these technical features, should be considered as within the scope of this specification.

The above-mentioned embodiments only express several implementation modes of the present invention, and the descriptions thereof are relatively specific and detailed, but should not be construed as limiting the patent scope of the invention. It should be noted that, for those skilled in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent for the present invention should be based on the appended claims.

Claims

A stent delivery device (10), used to deliver a stent (800), characterized by comprising: an inner tube (100), an outer tube (200), a limiting sleeve (300) and a releasing sleeve (400);

The limiting sleeve (300) and the releasing sleeve (400) are sleeved on the outside of the inner tube (100), and the outer tube (200) is sleeved on the limiting sleeve (300) . The outside of the release sleeve (400), the limit sleeve (300) is located on the distal side of the release sleeve (400);

The distal end of the release sleeve (400) is provided with a binding wire (410), and the binding wire (410) is used to bind the bare section (810) of the stent (800) to the limit sleeve (300) The release sleeve (400) is set to move towards the proximal end of the outer tube (200) under the action of an external force until the binding wire (410) releases the binding of the bare segment (810) .
The stent delivery device according to claim 1, characterized in that, the limit sleeve (300) is provided with a wire hole (310) along the direction from the proximal end to the distal end thereof, and the limit sleeve (300) ) is provided with a limiting groove (320) communicating with the wire passing hole (310) on the outer side wall;

The binding wire (410) can pass through the wire passing hole (310) and is configured to be able to be pulled out from the wire passing hole (310) under the action of an external force.
The stent delivery device according to claim 2, characterized in that the number of the wire passing holes (310), the limiting grooves (320) and the binding wires (410) are multiple, and correspond to each other ;

The wire passing holes (310) and the limiting grooves (320) are evenly distributed along the circumferential direction of the limiting sleeve (300) and extend along the axial direction, and the binding wire (410) is along the The release sleeves (400) are evenly distributed circumferentially and extend in the axial direction.
The stent delivery device according to claim 2, characterized in that, the wire passing hole (310) is a blind hole.
The stent delivery device according to claim 2, characterized in that, the limiting groove (320) communicates with the lumen (330) of the limiting sleeve (300).
The stent delivery device according to claim 2, characterized in that, the outer wall of the limiting sleeve (300) is respectively provided with a plurality of limiting grooves (320) in the axial direction and in the circumferential direction, and the plurality of limiting grooves (320) The limiting slots (320) are evenly distributed in the axial and circumferential directions.
The stent delivery device according to claim 1, characterized in that, the proximal end of the release sleeve (400) is provided with a release wire (420), and the release wire (420) is configured to be able to be pulled under the action of an external force The release sleeve (400) moves.
The stent delivery device according to claim 1, characterized in that, a reinforcing part (340) is formed at the proximal end of the limiting sleeve (300); the reinforcing part (340) and the releasing sleeve (400) ) at least one outer wall is a wear-increasing structure.
The stent delivery device according to any one of claims 1-8, the stent delivery device (10) further comprising a tapered guide (500) detachably connected to the distal port of the outer tube (200) , the distal end of the inner tube (100) is connected with the tapered guide (500).
The stent delivery device according to any one of claims 1-8, the stent delivery device (10) further comprising: a handle, an ejection head (600) and an elastic member (700);

The handle is connected to the proximal end of the outer tube (200), the ejector head (600) and the elastic member (700) are arranged in the outer tube (200), and the ejector head (600) The distal end is used to abut against the proximal end of the bracket (800), and the two ends of the elastic member (700) are respectively connected to the handle and the ejection head (600);

The proximal end of the inner tube (100) passes through the ejector head (600) and is connected with the handle.
The stent delivery device according to claim 10, characterized in that, the distal end of the ejection head (600) is provided with a bracket installation boss (610), and/or the proximal end of the ejection head (600) is provided with The elastic member is installed with the boss (620).
The stent delivery device according to claim 11, characterized in that, the elastic member installation boss (620) has a tube hole, and the proximal end of the inner tube (100) passes through the tube hole and the tube hole. Handle connection.
The stent delivery system according to claim 3, wherein the bare segment (810) is a mesh structure, comprising a plurality of stent segments (811) distributed sequentially along the axial direction, and two adjacent stent segments (811) ) vertices (812) are interlocked.
The stent delivery system according to claim 13, characterized in that, the number of the wire passing holes (310), the number of the binding wires (410), and the limiting groove (320) in the circumferential direction ) is the same as the number of vertices (812) of each stent segment (811).
A stent delivery system, characterized by comprising a stent (800) and the stent delivery device (10) according to any one of claims 1-14.