CN116269968A

CN116269968A - Vascular stent conveying system

Info

Publication number: CN116269968A
Application number: CN202310586630.0A
Authority: CN
Inventors: 李彬彬; 吕纬岩; 孙剑; 胡晓鹏
Original assignee: Beijing Jiushi Shenkang Medical Technology Co ltd
Current assignee: Beijing Jiushi Shenkang Medical Technology Co ltd
Priority date: 2023-05-24
Filing date: 2023-05-24
Publication date: 2023-06-23
Anticipated expiration: 2043-05-24
Also published as: CN116269968B

Abstract

The invention relates to a vascular stent delivery system, which comprises a flexible distal end, an expansion body and a first elastic section from the distal end to the proximal end in sequence; the proximal end of the first elastic section is connected with a pushing rod, and the distal end of the first elastic section is connected with the expansion body; the first elastic segment is in a stretched state when the inflation body is disposed within the catheter sheath. According to the invention, when the vascular stent is released, the first elastic section drives the expansion body to slide from one end to the other end in the axial direction of the vascular stent, so that the vascular stent is completely unfolded, the vascular stent is prevented from kinking, the adherence between the vascular stent and the vascular wall is improved, and the success rate of an operation is improved.

Description

Vascular stent conveying system

Technical Field

The invention relates to the field of medical equipment, in particular to a vascular stent conveying system for treating intracranial vascular diseases.

Background

Cerebrovascular diseases are a group of diseases that occur in cerebral blood vessels and cause damage to brain tissue due to intracranial blood circulation disorders. It is broadly referred to various diseases of the cerebral vessels, including cerebral atherosclerosis, thrombosis, stenosis, occlusion, cerebral arteritis, cerebral arterial injury, cerebral aneurysms, intracranial vascular malformations, cerebral arteriovenous fistulae, and the like. Aneurysms are a permanent swelling disease that occurs due to weakness in the arterial wall. Aneurysms can form anywhere, but the most common and troublesome place for an aneurysm to occur is in the cerebral arteries, the aorta, and the aorta that carries the blood pumped by the heart to other parts of the body. Wherein, the cerebral aneurysm is a tumor-like protrusion of the arterial wall caused by the limited abnormal expansion of the cerebral arterial lumen, and is the first cause of subarachnoid hemorrhage.

At present, a surgical treatment method for treating cerebrovascular diseases adopts a stent implantation method, a stent is implanted into a blood vessel by a delivery system, blood flow entering an aneurysm from a carrying aneurysm is disturbed, and blood in the aneurysm is blocked and deposited, so that aneurysm thrombosis is formed, and a tumor body is further promoted to be closed, so that the tumor body is prevented from being broken. However, the advancing and expanding effects of the prior art delivery systems on stents have been somewhat inadequate.

The conveying system in the prior art is provided with the expansion section, so that the problem that the stent cannot be opened due to kinking in the stent releasing process is solved to a certain extent, but because the kinking part of the stent is random, if kinking occurs in the non-expansion section, the stent still cannot be opened; or, the stent and the expansion section are kinked together, and can not be opened, and because the stent and the expansion section are overlapped, if the kink is generated simultaneously, the kink condition is aggravated, the vessel wall can not be well attached, and the optimal treatment effect can not be achieved.

Disclosure of Invention

The technical problem to be solved by the invention is to provide a conveying system for preventing kinking and fully expanding a vascular stent aiming at the defects.

The invention is realized by the following technical scheme:

a vascular stent delivery system comprising, in order from a distal end to a proximal end, a flexible distal end, an inflation body, and a first elastic segment; the proximal end of the first elastic section is connected with a pushing rod, and the distal end of the first elastic section is connected with the expansion body; the first elastic segment is in a stretched state when the inflation body is disposed within the catheter sheath.

Further, in the vascular stent delivery system, the flexible distal end is fixed at the distal end of the push rod, the expansion body and the first elastic section are sleeved on the push rod, the proximal end of the first elastic section is fixed at the push rod, and the expansion body can slide along the push rod.

Further, in the vascular stent delivery system, a second elastic section is arranged between the flexible distal end and the expansion body, and the distal end of the second elastic section is connected to the flexible distal end; when the expansion body is placed in the catheter sheath, the second elastic section is in a compressed state and is abutted against the expansion body.

Further, in the vascular stent delivery system, the flexible distal end is connected with the expansion body, the distal end of the first elastic section is connected with the expansion body, and the proximal end of the first elastic section is connected with the push rod.

Further, in the vascular stent delivery system, a second elastic section is arranged between the flexible distal end and the expansion body, the distal end of the second elastic section is connected with the flexible distal end, and the proximal end of the second elastic section is connected with the expansion body; the second elastic segment is in a compressed state when the inflation body is disposed within the catheter sheath.

Further, the vascular stent delivery system further comprises a recovery pad, wherein the recovery pad is fixed on the pushing rod, and the proximal end of the first elastic section is connected with the recovery pad.

Further, the vascular stent conveying system further comprises a developing mark, and the developing mark is sleeved and fixed on the pushing rod.

Further, the vascular stent delivery system further comprises a protection seat, wherein the protection seat is sleeved and fixed on the pushing rod, and the protection seat extends from the proximal end to the distal end of the first elastic section in a horn shape; when the protection seat is arranged in the catheter sheath, the protection seat is in a radial compression state.

Further, in the vascular stent delivery system, the expansion body is formed by mixed braiding of nickel-titanium alloy or cobalt-chromium alloy and a radiopaque wire.

Further, in the vascular stent delivery system, the first elastic section is formed by mixed braiding of an elastic metal material and a radiopaque wire.

The invention has the advantages and effects that:

the vascular stent conveying system provided by the invention is provided with the expansion body and the first elastic section, when the vascular stent is released, the first elastic section drives the expansion body to slide in the vascular stent from one end to the other end along the axial direction of the vascular stent, so that the vascular stent is completely unfolded, the vascular stent is prevented from kinking, even if kinking occurs, the kinking condition of the vascular stent can be continuously released and corrected, the adherence and the stability of the vascular stent and the vascular wall are improved, and the success rate of an operation is further improved.

Drawings

Fig. 1 is a schematic view showing the structure of a stent delivery system of embodiment 1 provided by the present invention;

fig. 2 is a schematic structural view showing a stent delivery system of embodiment 2 provided by the present invention;

FIG. 3 is a schematic view showing the structure of a stent delivery system of embodiment 3 provided by the present invention;

FIG. 4 is a schematic view showing the structure of a stent delivery system of embodiment 4 provided by the present invention;

FIG. 5 is a schematic view showing the structure of a stent delivery system of embodiment 5 provided by the present invention;

fig. 6 shows a schematic application of example 5.

Reference numerals illustrate: 1-pushing rod, 2-flexible distal end, 3-expansion body, 4-first elastic section, 5-recovery pad, 6-development mark, 7-protection seat, 8-second elastic section, 9-vascular stent, 10-catheter sheath, A-distal end, B-proximal end.

Detailed Description

In order to make the purposes, technical solutions and advantages of the implementation of the present invention more clear, the technical solutions in the embodiments of the present invention are described in more detail below with reference to the accompanying drawings in the embodiments of the present invention. The described embodiments are some, but not all, embodiments of the invention. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to fall within the scope of the invention. Embodiments of the present invention will be described in detail below with reference to the attached drawings:

in the description of the present invention, it is to be understood that, unless otherwise indicated, the meaning of "a plurality" is two or more; the terms "center," "longitudinal," "transverse," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used for convenience in describing and simplifying the description based on the orientation or positional relationship shown in the drawings, and do not denote or imply that the devices or elements being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the scope of the 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 relative importance. In the description of the present invention, it should also be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the above terms in the present invention can be understood as appropriate by those of ordinary skill in the art.

In this specification, the term "proximal" generally refers to an end that is proximal to the operator of the medical device, and "distal" generally refers to an end that is distal from the operator of the medical device, typically the end that enters the human body first.

The stent delivery system comprises, in order from the distal end to the proximal end, a flexible distal end 2, an inflatable body 3 and a first elastic segment 4. The proximal end of the first elastic section 4 (the end of the first elastic section near the proximal end B) is connected with the push rod 1, and the distal end of the first elastic section 4 (the end of the first elastic section near the distal end a) is connected with the expansion body 3, so that the first elastic section can drive the expansion body to move according to the elastic expansion capacity of the first elastic section. The expansion body 3 is in an expanded form in a free state (as shown in fig. 1 to 6) to support the stent. When the inflation body 3 is placed in the catheter sheath 10, the inflation body 3 extends in the axial direction of the catheter sheath 10, and the diameter of the inflation body 3 is reduced so as to be able to be placed in the catheter sheath 10 together with the stent 9 at a prescribed position to be delivered into a blood vessel. When the expansion body 3 and the vascular stent are placed in the catheter sheath 10, the first elastic section 4 is in a stretched state, the expansion body 3 is placed in the distal end of the vascular stent 9 (refer to the end of the vascular stent close to the distal end A), when the vascular stent is released, the expansion body expands at the distal end of the vascular stent (as shown in fig. 6), and under the rebound action of the first elastic section, the expansion body is driven to move from the distal end of the vascular stent to the proximal end of the vascular stent, so that the vascular stent is completely supported and smoothly adjusted.

Specifically, fig. 1 shows a schematic structural diagram of a vascular stent delivery system of embodiment 1 provided by the present invention. The vascular stent conveying system comprises a pushing rod 1, a flexible distal end 2, an expansion body 3, a first elastic section 4, a recovery pad 5 and a developing mark 6, wherein the flexible distal end 2, the expansion body 3, the first elastic section 4, the recovery pad 5 and the developing mark 6 are sleeved on the pushing rod 1 in sequence from the distal end to the proximal end. The flexible distal end 2 is fixed to the distal end of the push rod 1 (meaning the end of the push rod near the distal end a). The recovery pad 5 is fixed to the push rod 1, and the proximal end of the first elastic section 4 (the end of the first elastic section near the proximal end B) is connected to the recovery pad 5, so that the proximal end of the first elastic section 4 is fixed to the push rod 1. The distal end of the first elastic segment 4 (the end of the first elastic segment near the distal end a) is connected to the expansion body 3, so that the expansion body 3 can slide axially along the push rod 1 under the elastic drive of the first elastic segment. The developing mark 6 is fixed on the pushing rod 1, and is used for facilitating a doctor to accurately convey the catheter sheath to a designated position of a blood vessel under X-ray and making corresponding operation. When the vascular stent is placed in the catheter sheath 10, the vascular stent is sleeved outside the expansion body 3 in an extending state, the first elastic section 4 in a stretching state and the recovery pad 5, the recovery pad 5 supports the vascular stent which is not released, and the friction force among the recovery pad, the vascular stent and the inner wall of the catheter sheath is increased so as to drive the pushing of the vascular stent.

Fig. 2 shows a schematic structural diagram of a stent delivery system according to embodiment 2 of the present invention. The vascular stent conveying system comprises a pushing rod 1, a flexible distal end 2, an expansion body 3, a first elastic section 4, a recovery pad 5, a protection seat 7 and a developing mark 6 which are sequentially sleeved on the pushing rod 1 from the distal end to the proximal end. Unlike example 1, the vascular stent delivery system also includes a protective socket 7. The protecting seat 7 is fixed on the pushing rod 1, one end of the protecting seat is located at the far end of the developing mark 6 (the end of the developing mark near the far end A), and the other end is a free end and extends to the position of the recovering pad 5 in a horn shape towards the far end. When the protective sheath 7 is placed in the catheter sheath 10, the protective sheath 7 is in a radially compressed state. When the vascular stent is placed in the catheter sheath 10, the vascular stent is sleeved outside the expansion body 3 in an extending state, the first elastic section 4 in a stretching state and the recovery pad 5, and the protection seat 7 is wrapped at the proximal end of the vascular stent, so that the friction force among the recovery pad, the vascular stent, the protection seat and the inner wall of the catheter sheath is increased to drive the pushing of the vascular stent, the protection seat protects the proximal end of the vascular stent (the end part of the vascular stent, which is close to the proximal end B), the vascular stent is not damaged, and the expansion body is deviated from the supporting track due to the rebound force of the first elastic section when the vascular stent is released.

Fig. 3 is a schematic view showing the structure of a stent delivery system of embodiment 3 provided by the present invention. The vascular stent conveying system comprises a pushing rod 1, a flexible distal end 2, an expansion body 3, a first elastic section 4, a protection seat 7 and a developing mark 6 which are sequentially sleeved on the pushing rod 1 from the distal end to the proximal end. Unlike example 2, the stent delivery system is not provided with a retrieval pad, and the first elastic segment 4 is directly connected to the push rod 1 so that its proximal end is fixed. When the vascular stent is placed in the catheter sheath 10, the vascular stent is sleeved outside the expansion body 3 in an extending state and the first elastic section 4 in a stretching state, and the protective seat 7 is wrapped at the proximal end of the vascular stent, so that the friction force among the vascular stent, the protective seat and the inner wall of the catheter sheath is increased to drive the pushing of the vascular stent, the protective seat protects the proximal end of the vascular stent (the end of the vascular stent close to the proximal end B) from being damaged, and the expansion body is prevented from deviating from a supporting track due to the rebound force of the first elastic section when the vascular stent is released.

Fig. 4 shows a schematic structural view of a stent delivery system according to embodiment 4 of the present invention. The vascular stent conveying system comprises a pushing rod 1, a flexible distal end 2, a second elastic section 8, an expansion body 3, a first elastic section 4, a protection seat 7 and a developing mark 6 which are sequentially sleeved on the pushing rod 1 from the distal end to the proximal end. Unlike embodiment 3, a second elastic section 8 is provided between the flexible distal end 2 and the expansion body 3, and the distal end of the second elastic section 8 (the end of the first elastic section near the distal end a) is connected to the flexible distal end 2, and the proximal end thereof is a free end. When the expansion body 3 is placed in the catheter sheath 10, the second elastic section 8 is in a compressed state and is abutted against the expansion body 3, and the first elastic section 4 is in a stretched state. When the stent is released, as shown in fig. 6, the expansion body is expanded at the distal end of the stent (refer to the end of the stent near the distal end a), and then as the stent is gradually released, the expansion body moves from the distal end of the stent to the proximal end (not shown) thereof under the pushing action of the second elastic section and the pulling back action of the first elastic section, so as to support the stent completely and smoothly. The vascular stent delivery system can also be provided with a recovery pad or a protective seat according to the requirement.

Fig. 5 shows a schematic structural view of a stent delivery system of embodiment 5 provided by the present invention. The vascular stent delivery system comprises a flexible distal end 2, an expansion body 3, a first elastic section 4, a protection seat 7, a developing mark 6 and a pushing rod 1 which are sequentially connected from the distal end to the proximal end. Unlike example 3, the flexible distal end 2, the expansion body 3 and the first elastic segment 4 are not sleeved on the push rod 1. The flexible distal end 2 is connected to the expansion body 3, the distal end of the first elastic segment 4 (meaning the end of the first elastic segment near the distal end a) is connected to the expansion body 3, and the proximal end of the first elastic segment 4 (meaning the end of the first elastic segment near the proximal end B) is connected to the push rod 1. Likewise, the first elastic segment 4 is in a stretched state when the inflation body 3 is placed in the catheter sheath 10. The protection seat 7 and the developing mark 6 can be sleeved on the push rod 1 or not sleeved on the push rod 1, but directly connected. When the vascular stent is placed in the catheter sheath 10, the vascular stent is sleeved outside the expansion body 3 in an extending state and the first elastic section 4 in a stretching state, and the protective seat 7 is wrapped at the proximal end of the vascular stent, so that friction force among the vascular stent, the protective seat and the inner wall of the catheter sheath is increased to drive pushing of the vascular stent, the protective seat protects the proximal end of the vascular stent (the end of the vascular stent close to the proximal end B) from being damaged, and the expansion body is prevented from deviating from a supporting track when the vascular stent is released.

In another embodiment, unlike embodiment 5, a second elastic segment 8 is disposed between the flexible distal end 2 and the expansion body 3, the distal end of the second elastic segment 8 is connected to the flexible distal end 2, and the proximal end of the second elastic segment 8 is connected to the expansion body 3. When the inflatable body 3 is placed in the catheter sheath 10, the second elastic segment 8 is in a compressed state and the first elastic segment 4 is in a stretched state. When the vascular stent is released, the expansion body moves from the distal end of the vascular stent to the proximal end thereof under the pushing action of the second elastic section and the pulling action of the first elastic section, so that the vascular stent is completely supported and smoothly adjusted.

In various embodiments, the flexible distal end is preferably, but not limited to, a radiopaque wire, such as platinum tungsten alloy, platinum iridium alloy, or the like. The diameter of the expansion body is smaller than or equal to the diameter of the bracket. The expansion body can be formed by mixed braiding of nickel-titanium alloy or cobalt-chromium alloy and a radiopaque wire; or is formed by braiding cored wires consisting of metal such as nickel-titanium alloy on the outer layer and radiopaque metal wires on the inner layer; or is formed by heat treatment after cutting nickel-titanium alloy; or is formed by heat treatment after nickel-titanium alloy cutting, and more than 2 radiopaque markers are uniformly distributed in the radial direction; or is woven from elastic polymer material such as nylon. The first elastic section and the second elastic section may be a metallic material having elasticity, such as stainless steel, nickel titanium; or is formed by mixed braiding of an elastic metal material and a radiopaque wire; or is formed by braiding cored wires consisting of metal such as nickel-titanium alloy on the outer layer and radiopaque metal wires on the inner layer. The recovery pad is made of high molecular materials such as silica gel and the like. The material of the protection seat is the same as that of the expansion body.

The above embodiments are only for illustrating the technical solution of the present invention, and are not intended to limit the implementation scope of the present invention. All equivalent changes and modifications within the scope of the present invention should be considered as falling within the scope of the present invention.

Claims

1. A vascular stent delivery system, characterized in that it comprises, in order from distal end to proximal end, a flexible distal end (2), an expansion body (3) and a first elastic segment (4); the proximal end of the first elastic section (4) is connected with the pushing rod (1), and the distal end of the first elastic section (4) is connected with the expansion body (3); the first elastic segment (4) is in a stretched state when the expansion body (3) is placed in the catheter sheath (10).

2. A vascular stent delivery system according to claim 1, wherein the flexible distal end (2) is fixed to the distal end of the push rod (1), the expansion body (3) and the first elastic section (4) are sleeved on the push rod (1), the proximal end of the first elastic section (4) is fixed to the push rod (1), and the expansion body (3) is slidable along the push rod (1).

3. A vascular stent delivery system according to claim 2, wherein a second elastic segment (8) is arranged between the flexible distal end (2) and the expansion body (3), the distal end of the second elastic segment (8) being connected to the flexible distal end (2); when the expansion body (3) is placed in the catheter sheath (10), the second elastic section (8) is in a compressed state and is abutted against the expansion body (3).

4. A vascular stent delivery system according to claim 1, wherein the flexible distal end (2) is connected to the expansion body (3), the distal end of the first elastic segment (4) is connected to the expansion body (3), and the proximal end of the first elastic segment (4) is connected to the push rod (1).

5. A vascular stent delivery system according to claim 4, wherein a second elastic segment (8) is arranged between the flexible distal end (2) and the expansion body (3), the distal end of the second elastic segment (8) being connected to the flexible distal end (2), the proximal end of the second elastic segment (8) being connected to the expansion body (3); the second elastic segment (8) is in a compressed state when the expansion body (3) is placed in the catheter sheath (10).

6. A vascular stent delivery system according to any of claims 1 to 5, further comprising a retrieval pad (5), wherein the retrieval pad (5) is fixed to the push rod (1), and wherein the proximal end of the first elastic segment (4) is connected to the retrieval pad (5).

7. A vascular stent delivery system according to any of claims 1 to 5, further comprising a visualization marker (6), wherein the visualization marker (6) is sleeved and fixed to the push rod (1).

8. A vascular stent delivery system according to any of claims 1 to 5, further comprising a protective seat (7), wherein the protective seat (7) is sleeved and fixed to the push rod (1), and wherein the protective seat (7) extends in a horn shape from the proximal end to the distal end of the first elastic section (4); when the protection seat (7) is arranged in the catheter sheath (10), the protection seat (7) is in a radial compression state.

9. A vascular stent delivery system according to any of claims 1 to 5, wherein the expansion body (3) is braided from a nickel titanium alloy or cobalt chromium alloy mixed with a radiopaque wire.

10. A vascular stent delivery system according to any of claims 1 to 5, wherein the first elastic segment (4) is braided from a resilient metallic material mixed with a radiopaque wire.