CN120884341A

CN120884341A - A segmented self-expanding bolt holder with filter screen

Info

Publication number: CN120884341A
Application number: CN202511365933.5A
Authority: CN
Inventors: 何婷婷; 郝建华; 叶嘉铭; 王东阳; 王格; 赵舒畅
Original assignee: Hangzhou Likai Technology Co ltd
Current assignee: Hangzhou Likai Technology Co ltd
Priority date: 2025-09-24
Filing date: 2025-09-24
Publication date: 2025-11-04

Abstract

The invention belongs to the technical field of thrombus taking supports, and particularly relates to a sectional type self-expanding thrombus taking support with a filter screen, which comprises the following components: the nickel titanium self-expanding support, the one end fixedly connected with development soft head end of nickel titanium self-expanding support, the other end fixedly connected with push rod of nickel titanium self-expanding support, nickel titanium is from forming two at least funnel type structures through weaving along length direction on the support, funnel type structure's opening is towards push rod, fixedly connected with filtration in the funnel type structure. By utilizing the structures, the device realizes the effective capture of thrombus, and the problem that thrombus is easy to escape to the far end during thrombus taking in the prior art is accurately solved.

Description

Sectional type takes self-expansion of filter screen to get bolt support

Technical Field

The invention belongs to the technical field of thrombus taking supports, and particularly relates to a sectional type self-expanding thrombus taking support with a filter screen.

Background

In the vascular system of the human body, thrombus formation is closely related to factors such as vascular endothelial injury, abnormal hemodynamics, and blood coagulation hyperfunction, and is widely found in the arterial system and venous system. If the thrombus stays for a long time, the vascular lumen is narrowed and even completely blocked, the blood supply of corresponding organs is affected, and when the thrombus fragments fall off due to the impact of blood flow and circulate in the body along with the cardiovascular system, the blood vessels with finer distal end tube diameters are easily blocked. The blockage can cause a series of critical symptoms that thrombus of a venous system is shed to cause pulmonary embolism, lung gas exchange and systemic blood circulation are disturbed, respiratory failure can be induced when serious, ischemic cerebral apoplexy is often caused by thrombus shed of an arterial system, and irreversible nerve function damage of brain tissues caused by hypoxia and ischemia is caused, which is manifested as limb paralysis, language disorder, consciousness disorder and the like, thus not only reducing the life quality of patients, but also being more likely to directly endanger lives and being a great threat to human health and life safety.

Currently, the medical field has proven that effective treatment means for ischemic cerebral apoplexy mainly comprise two types of medicine thrombolysis and mechanical thrombolysis. The thrombolysis medicine dissolves thrombus by intravenous infusion of specific thrombolytic medicine to recover vessel patency, but the method has strict application limitation that on one hand, the requirement of a definite time window (usually needs to be implemented within 4.5 hours after the onset of illness) exists, the treatment effect is obviously reduced and the bleeding risk is increased after exceeding the time window, and on the other hand, the thrombolysis medicine belongs to contraindication for patients with active bleeding, recent operation history, serious liver and kidney dysfunction and the like, and the clinical application range is limited. Therefore, when the thrombolysis medicine cannot meet the treatment requirement, especially when facing thrombus with harder texture and difficult penetration of medicine, mechanical thrombolysis becomes a key technical means for restoring vascular patency.

The current operation flow of mechanical thrombus taking is that a hollow catheter is pushed to a thrombus formation part through a vascular access (such as femoral artery and radial artery) by interventional operation, then negative pressure is generated by a suction device connected with the tail end of the catheter, thrombus is sucked into the catheter, and the catheter and the thrombus are removed out of the body together, so that thrombus removal is realized. However, because of the remarkable difference of thrombus types (such as acute soft thrombus, subacute hard thrombus, chronic mechanized thrombus and the like) in clinic, part of thrombus with harder texture or larger volume can not be thoroughly removed by pure suction, and the thrombus needs to be disintegrated by additionally using a thrombus taking guide wire or a special cutting instrument. However, in the thrombus cutting process, the small broken thrombus particles are easy to escape along with blood flow to the distal end of the blood vessel, and the escaped thrombus fragments can block finer distal end blood vessel branches to cause secondary ischemia, so that the treatment effect of a thrombus removing operation is reduced, and the nerve function damage of a patient is possibly aggravated, so that the problem of thrombus escape in the thrombus removing process is effectively avoided, and the thrombus removing device becomes a core defect to be solved in the current mechanical thrombus removing technical field.

Disclosure of Invention

The invention aims to provide a sectional type self-expanding thrombus taking support with a filter screen so as to solve the problems.

In order to achieve the above object, the present invention provides the following solutions:

A sectional type self-expanding thrombus taking support with a filter screen comprises a nickel-titanium self-expanding support, wherein one end of the nickel-titanium self-expanding support is fixedly connected with a developing soft head end, the other end of the nickel-titanium self-expanding support is fixedly connected with a pushing rod, at least two funnel-shaped structures are formed on the nickel-titanium self-expanding support along the length direction through braiding, openings of the funnel-shaped structures face the pushing rod, and a filtering structure is fixedly connected in the funnel-shaped structures.

Preferably, the funnel structure comprises at least two connecting rods integrally formed with the nickel-titanium self-expanding bracket, a plurality of connecting rods are distributed at equal intervals along the width direction of the nickel-titanium self-expanding bracket, and a plurality of connecting rods are fixedly connected to one point and form a funnel shape together with the nickel-titanium self-expanding bracket.

Preferably, a plurality of the connecting rods are fixed to one point by soldering or dispensing.

Preferably, the same developing ring is sleeved on the outer sides of a plurality of connecting rods in the same funnel-shaped structure.

Preferably, the filtering structure comprises a polymer filter screen fixedly connected with the nickel-titanium self-expanding bracket, and the polymer filter screen is matched with the funnel-shaped structure.

Preferably, the pores of the polymer filter screen are 100-300 microns.

Preferably, the edge of the polymer filter screen is fixedly connected with the nickel-titanium self-expanding bracket through a nylon wire.

Preferably, micropores are formed in a cutting rod of the nickel-titanium self-expanding bracket, which is close to the polymer filter screen, and the nylon wire passes through an edge grid of the polymer filter screen and is fixed to the polymer filter screen through the micropores.

Compared with the prior art, the invention has the following advantages and technical effects:

According to the invention, at least two funnel-shaped structures (the openings face the pushing rod) formed along the length direction of the nickel-titanium self-expanding stent can guide thrombus to gather towards the proximal end, and the filter structure fixed in the funnel is matched with the filter structure, so that cut thrombus fragments can be intercepted in a segmented manner, the problem that thrombus is easy to escape towards the distal end during thrombus taking in the prior art is accurately solved, and secondary ischemia is avoided.

The nickel-titanium self-expanding stent has the self-expanding characteristic, can be automatically expanded in a blood vessel and attached to the wall of the blood vessel, drives the filtering structure to be stably expanded without additional operation, and has the advantages of developing a soft head end, facilitating positioning in an operation, pushing a rod, facilitating operation and control of an operator, and remarkably optimizing operation experience of the operator.

The filtering structure continues the high toughness and ultrathin property in the original document, can ensure normal circulation of blood while effectively intercepting thrombus fragments, avoid blood vessel blockage, further ensure operation safety and prognosis of patients, and realize the double effects of thrombus collection and blood flow guarantee.

By utilizing the structures, the device realizes the effective capture of thrombus, and the problem that thrombus is easy to escape to the far end during thrombus taking in the prior art is accurately solved.

Drawings

For a clearer description of an embodiment of the invention or of the solutions of the prior art, the drawings that are needed in the embodiment will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art:

FIG. 1 is a schematic diagram of the structure of the present invention;

FIG. 2 is a schematic view of the structure of the self-expanding stent of the present invention;

FIG. 3 is a schematic view of a cutting bar on a nickel titanium self-expanding stent;

FIG. 4 is a schematic structural view of a polymeric filter;

FIG. 5 is a schematic view of a cutting bar mounted polymeric screen on a nickel titanium self-expanding stent;

FIG. 6 is a deployment view of the present device within a thrombosed vessel;

FIG. 7 is a deployment view of the present device in a thrombosed vessel when the thrombus is broken;

Wherein, 1, nickel titanium self-expanding bracket; 2, a polymer filter screen, 3, C-shaped developing rings, 4, a first developing ring, 5, a second developing ring, 6, a developing soft head end, 7, a push rod, 8, nylon wires, 11, a cutting rod, 12, micropores, 21, meshes, 22, a first connecting rod, 23, a second connecting rod and 24, a third connecting rod.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. 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 be within the scope of the invention.

In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description.

Referring to fig. 1 to 7, the invention discloses a sectional type self-expanding thrombus taking support with a filter screen, which comprises a nickel titanium self-expanding support 1, wherein one end of the nickel titanium self-expanding support 1 is fixedly connected with a developing soft head end 6, the other end of the nickel titanium self-expanding support 1 is fixedly connected with a pushing rod 7, at least two funnel-shaped structures are formed on the nickel titanium self-expanding support 1 along the length direction through braiding, an opening of each funnel-shaped structure faces the pushing rod 7, and a filtering structure is fixedly connected in each funnel-shaped structure.

Wherein, the quantity of funnel formula structure sets up to three effect optimums, can accomplish comparatively balanced in length and functionality, and push rod 7's setting is in order to push into whole device better, and the setting of developing soft head end 6 is in order to protect the blood vessel inner wall to prevent the fish tail.

Further optimizing scheme, funnel type structure includes two at least and nickel titanium self-expanding support 1 integrated into one piece's connecting rod, and a plurality of connecting rod is along nickel titanium self-expanding support 1 width direction equidistant distribution, and a plurality of connecting rod fixed connection is to a point and form the funnel shape with nickel titanium self-expanding support 1 jointly.

As shown in fig. 2, the number of the connecting rods integrally formed with the nitinol self-expanding stent 1 is two, wherein two first connecting rods 22, two second connecting rods 23, and two third connecting rods 24 are respectively disposed along the length direction of the nitinol self-expanding stent 1.

Further optimizing scheme, a plurality of connecting rods are fixed to one point through the mode of soldering or point gluing.

Further optimizing scheme, the same developing ring is sleeved outside a plurality of connecting rods in the same funnel-shaped structure.

As shown in fig. 2, because the left and right ends of the two first connecting rods 22 are connected to the nitinol self-expanding bracket 1, the outer sides of the two first connecting rods 22 are sleeved with the C-shaped developing ring 3, the C-shaped developing ring can be directly sleeved without damaging the nitinol self-expanding bracket 1, and for the two second connecting rods 23 and the two third connecting rods 24, only one end is connected to the nitinol self-expanding bracket 1, and the other end is in an exposed state, so that for the developing rings fixed on the two second connecting rods 23 and the two third connecting rods 24, the first developing ring 4 and the second developing ring 5 can be directly adopted.

Further optimizing scheme, the filtration includes the polymer filter screen 2 with nickel titanium self-expanding support 1 fixed connection, polymer filter screen 2 and funnel type structure looks adaptation.

Further optimizing scheme, the pore of the polymer filter screen 2 is 100-300 microns.

This aperture is chosen to effectively block the thrombus while leaving a void for blood to pass through.

In a further optimized scheme, the edge of the polymer filter screen 2 is fixedly connected with the nickel-titanium self-expanding bracket 1 through a nylon wire 8.

According to the further optimization scheme, micropores 12 are formed in a cutting rod 11 of a part, close to the polymer filter screen 2, of the nickel-titanium self-expansion bracket 1, and nylon wires 8 penetrate through edge grids of the polymer filter screen 2 and fix the polymer filter screen 2 through the micropores 12.

As shown in fig. 5, a cutting rod 11 on the nitinol self-expandable stent 1 (the cutting rod 11 is not a single rod body, but a section on the nitinol self-expandable stent 1 near the polymer filter screen 2 is a section on the body of the nitinol self-expandable stent 1), nylon wires 8 sequentially pass through the edge mesh and micropores 12 of the polymer filter screen 2, and then the polymer filter screen 2 is fixed by binding or the like.

When the device is inserted into a blood vessel with thrombus, as shown in fig. 6, the soft head end 6 is developed to penetrate through the thrombus, then the nickel titanium self-expanding stent 1 is unfolded, at the moment, the cutting rod 11 drives the polymer filter screen 2 to be synchronously unfolded, so that the protection in the blood vessel is realized, and then the thrombus falls off into the polymer filter screen 2, so that the effective collection is realized. When the thrombus needs to be cut, the thrombus can be cut into a small block structure, and at the moment, the plurality of polymer filter screens 2 in the device play an effective blocking role, and as shown in fig. 7, the thrombus fragments can be synchronously collected by the multi-stage polymer filter screens 2, so that the thrombus fragments are ensured not to fall out of the protection of the device, and the fragments are prevented from harming the health of a human body. The device makes the operator experience better, and the operation is safer and more reliable.

In the description of the present invention, it should be understood that the terms "longitudinal," "transverse," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the present invention, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention.

The above embodiments are only illustrative of the preferred embodiments of the present invention and are not intended to limit the scope of the present invention, and various modifications and improvements made by those skilled in the art to the technical solutions of the present invention should fall within the protection scope defined by the claims of the present invention without departing from the design spirit of the present invention.

Claims

1. The sectional type self-expanding thrombus taking support with the filter screen is characterized by comprising a nickel titanium self-expanding support (1), wherein one end of the nickel titanium self-expanding support (1) is fixedly connected with a developing soft head end (6), the other end of the nickel titanium self-expanding support (1) is fixedly connected with a pushing rod (7), at least two funnel-shaped structures are formed on the nickel titanium self-expanding support (1) along the length direction through braiding, openings of the funnel-shaped structures face the pushing rod (7), and a filtering structure is fixedly connected in the funnel-shaped structures.

2. The sectional type self-expanding thrombus taking support with a filter screen according to claim 1, wherein the funnel-shaped structure comprises at least two connecting rods integrally formed with the nickel-titanium self-expanding support (1), a plurality of the connecting rods are distributed at equal intervals along the width direction of the nickel-titanium self-expanding support (1), and the connecting rods are fixedly connected to one point and form a funnel shape together with the nickel-titanium self-expanding support (1).

3. The self-expanding stent with a filter screen according to claim 2, wherein the connecting rods are fixed to one point by soldering or dispensing.

4. The sectional type self-expanding thrombus taking support with a filter screen according to claim 2, wherein the outer sides of a plurality of connecting rods in the same funnel-shaped structure are sleeved with the same developing ring.

5. The sectional type self-expanding thrombus taking support with a filter screen according to claim 1, wherein the filter structure comprises a polymer filter screen (2) fixedly connected with the nickel titanium self-expanding support (1), and the polymer filter screen (2) is matched with the funnel-shaped structure.

6. The segmented filter screen self-expanding thrombus support according to claim 5, wherein the pores of the polymer filter screen (2) are 100-300 microns.

7. The sectional type self-expanding thrombus taking support with a filter screen according to claim 5, wherein the edge of the polymer filter screen (2) is fixedly connected with the nickel-titanium self-expanding support (1) through nylon wires (8).

8. The sectional type self-expanding thrombus taking support with a filter screen according to claim 5, wherein micropores (12) are formed in a cutting rod (11) of a part, close to the high polymer filter screen (2), of the nickel-titanium self-expanding support (1), and the nylon wire (8) penetrates through an edge grid of the high polymer filter screen (2) and the micropores (12) to fix the high polymer filter screen (2).