Sectional type self-expanding thrombectomy stent with filter screen

Abstract

The invention belongs to the technical field of thrombectomy stents, and particularly relates to a sectional type self-expanding thrombectomy stent with a filter screen, which comprises a nickel-titanium self-expanding stent, one end of the nickel-titanium self-expanding stent is fixedly connected with a developing soft head end, and the other end of the nickel-titanium self-expanding stent is fixedly connected with a push rod; at least two funnel-shaped structures are formed on the nickel-titanium self-expanding support in the length direction through weaving, openings of the funnel-shaped structures face the pushing rod, and filtering structures are fixedly connected into the funnel-shaped structures. By means of the structure, the sectional type self-expanding thrombus extraction support with the filter screen can effectively capture thrombus and accurately solve the problem that thrombus is prone to escaping towards the far end in the thrombus extraction process in the prior art.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of thrombus extraction stents, and particularly relates to a sectional self-expanding thrombus extraction stent with a filter screen. BACKGROUND

[0002] In the human vascular system, the formation of thrombus is closely related to factors such as endothelial injury, abnormal hemodynamics, and hyperfunction of blood coagulation, and widely exists in the arterial system and the venous system. If these thrombi are retained for a long time, they can cause stenosis or even complete occlusion of the blood vessel lumen, affecting the blood supply of the corresponding organs; when the thrombus fragments are detached due to blood flow impact and circulate in the cardiovascular system in the body, they are extremely easy to block the blood vessels with smaller diameters in the distal end. This blockage can cause a series of critical conditions: thrombus detachment in the venous system can cause pulmonary embolism, interfere with pulmonary gas exchange and systemic blood circulation, and in severe cases can induce respiratory failure; thrombus detachment in the arterial system often causes ischemic stroke, causing irreversible nerve function damage of brain tissue due to hypoxia and ischemia, manifested as limb paralysis, language disorders, and consciousness disorders, which not only reduces the quality of life of patients, but also can directly endanger life, posing a major threat to human health and life safety.

[0003] At present, the medical field has confirmed that the effective treatment methods for ischemic stroke mainly include drug thrombolysis and mechanical thrombectomy. Among them, drug thrombolysis dissolves thrombus by intravenous infusion of specific thrombolytic drugs to restore blood vessel patency, but this method has strict application restrictions: on the one hand, there is a clear time window requirement (usually within 4.5 hours after onset), and the treatment effect decreases significantly and the risk of bleeding increases after the time window; on the other hand, for patients with active bleeding, recent surgery, severe liver and kidney dysfunction, etc., drug thrombolysis is contraindicated, and the clinical application range is limited. Therefore, when drug thrombolysis cannot meet the treatment needs, especially for thrombi with hard texture and difficult drug penetration, mechanical thrombectomy becomes a key technical means to restore blood vessel patency.

[0004] The current clinical commonly used mechanical thrombectomy operation procedure is: through the intervention operation, a hollow catheter is pushed to the thrombus formation site through the vascular access (such as femoral artery, radial artery), then a negative pressure is generated by using the suction device connected to the catheter end to suck the thrombus into the catheter, and then the catheter and the thrombus are removed out of the body to achieve thrombus removal. However, due to the significant difference in thrombus types in clinical practice (such as acute soft thrombus, subacute hard thrombus, chronic organized thrombus, etc.), part of the thrombus with hard texture or large volume cannot be completely removed by simple suction, and additional thrombectomy guide wire or special cutting instrument is required to fragment the thrombus. However, during the thrombus cutting process, the fragmented thrombus particles can easily escape to the distal end of the blood vessel along the blood flow, and these escaped thrombus fragments can block the finer distal vascular branches, causing "secondary ischemia", which not only reduces the treatment effect of thrombectomy surgery, but also may aggravate the patient's neurological damage, therefore, how to effectively avoid the thrombus escape problem during thrombectomy has become the core defect to be solved in the field of mechanical thrombectomy technology. SUMMARY

[0005] The purpose of the present application is to provide a segmented self-expanding thrombectomy stent with a filter screen to solve the above problems.

[0006] To achieve the above purpose, the present application provides the following scheme: A segmented self-expanding thrombectomy stent with a filter screen, comprising: a nickel-titanium self-expanding stent, one end of the nickel-titanium self-expanding stent is fixedly connected with a radiolucent soft head end, the other end of the nickel-titanium self-expanding stent is fixedly connected with a push rod, at least two funnel-shaped structures are formed on the nickel-titanium self-expanding stent along the length direction by weaving, the opening of the funnel-shaped structure faces the push rod, and a filter structure is fixedly connected in the funnel-shaped structure.

[0007] Preferably, the funnel-shaped structure comprises at least two connection rods integrally formed with the nickel-titanium self-expanding stent, a plurality of the connection rods are distributed at equal intervals along the width direction of the nickel-titanium self-expanding stent, and a plurality of the connection rods are fixedly connected to one point and form a funnel shape together with the nickel-titanium self-expanding stent.

[0008] Preferably, a plurality of the connection rods are fixed to one point by means of tin soldering or dispensing.

[0009] Preferably, a plurality of the connection rods in the same funnel-shaped structure are externally sleeved with the same radiolucent ring.

[0010] Preferably, the filter structure comprises a high-molecular filter screen fixedly connected with the nickel-titanium self-expanding stent, and the high-molecular filter screen is matched with the funnel-shaped structure.

[0011] Preferably, the pore size of the high-molecular filter screen is 100-300 microns.

[0012] Preferably, the edge of the high molecular filter screen is fixedly connected with the nickel-titanium self-expanding stent through a nylon thread.

[0013] Preferably, the cutting rod of the nickel-titanium self-expanding stent near the high molecular filter screen is provided with a micro-hole, and the nylon thread is fixed to the high molecular filter screen through the micro-hole and the edge grid of the high molecular filter screen.

[0014] Compared with the prior art, the present application has the following advantages and technical effects: In the present application, the at least two funnel-shaped structures (opening towards the pushing rod) formed along the length direction of the nickel-titanium self-expanding stent can guide the thrombus to gather towards the proximal end, and the fixed filter structure in the funnel can intercept the cut thrombus fragments in sections, accurately solving the problem that the thrombus easily escapes towards the distal end during thrombus extraction in the prior art, and avoiding "secondary ischemia".

[0015] The nickel-titanium self-expanding stent has the self-expanding property, can be automatically expanded in the blood vessel and adhere to the blood vessel wall, and can drive the filter structure to stably open without additional operation; the soft head end is convenient for intraoperative positioning, and the pushing rod is convenient for the operator to control, which significantly optimizes the operator's operation experience.

[0016] The filter structure continues the high-toughness and ultra-thin characteristics in the original document, can effectively intercept the thrombus fragments while ensuring normal blood circulation and avoiding blood vessel blockage, further guarantees the safety of the operation and the prognosis of the patient, and realizes the dual effects of "thrombus collection and blood flow guarantee".

[0017] By using these structures, the device realizes a segmented self-expanding thrombus extraction stent with a filter screen which effectively captures the thrombus and accurately solves the problem that the thrombus easily escapes towards the distal end during thrombus extraction in the prior art. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of these drawings: Figure 1 It is a structural schematic diagram of the present application; Figure 2 It is a structural schematic diagram of the nickel-titanium self-expanding stent expanded in the present application; Figure 3 It is a schematic diagram of the cutting rod on the nickel-titanium self-expanding stent; Figure 4 It is a structural schematic diagram of the high molecular filter screen; Figure 5 It is a schematic diagram of the cutting rod on the nickel-titanium self-expanding stent fixing the high molecular filter screen; Figure 6 is a deployment diagram of the device in a blood vessel with a thrombus; Figure 7 is a deployment diagram of the device in a blood vessel with a thrombus when the thrombus is broken; Wherein, 1, a self-expanding stent of nickel titanium; 2, a high molecular filter screen; 3, a C-shaped developing ring; 4, a first developing ring; 5, a second developing ring; 6, a developing soft head end; 7, a pushing rod; 8, a nylon line; 11, a cutting rod; 12, a micropore; 21, a mesh; 22, a first connecting rod; 23, a second connecting rod; 24, a third connecting rod. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present application will be apparently and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0020] In order to make the above-mentioned purposes, features and advantages of the present application more apparent and easy to understand, the present application will be further described in detail below with reference to the drawings and specific embodiments.

[0021] Reference Figures 1 to 7 The present application discloses a segmented self-expanding thrombectomy stent with a filter screen, comprising: a self-expanding stent of nickel titanium 1, one end of the self-expanding stent of nickel titanium 1 is fixedly connected with a developing soft head end 6, the other end of the self-expanding stent of nickel titanium 1 is fixedly connected with a pushing rod 7, at least two funnel-shaped structures are formed on the self-expanding stent of nickel titanium 1 along the length direction by weaving, the openings of the funnel-shaped structures face the pushing rod 7, and a filter structure is fixedly connected in the funnel-shaped structure.

[0022] Among them, the number of funnel-shaped structures is set to three for the best effect, which can achieve a balance in length and functionality, and the setting of the pushing rod 7 is to better push the entire device, and the setting of the developing soft head end 6 is to protect the inner wall of the blood vessel from scratching.

[0023] Further optimization scheme, the funnel-shaped structure includes at least two connecting rods integrally formed with the self-expanding stent of nickel titanium 1, the connecting rods are distributed along the width direction of the self-expanding stent of nickel titanium 1 at equal intervals, and the connecting rods are fixedly connected to a point and form a funnel shape together with the self-expanding stent of nickel titanium 1.

[0024] As shown in Figure 2 The number of connecting rods integrally formed with the self-expanding stent of nickel titanium 1 is two, wherein two first connecting rods 22, two second connecting rods 23 and two third connecting rods 24 are arranged along the length direction of the self-expanding stent of nickel titanium 1.

[0025] Further optimization scheme, several connecting rods are fixed to a point by soldering or dispensing.

[0026] Further optimization scheme, several connecting rods in the same funnel structure are externally sleeved with the same developing ring.

[0027] Among them, as shown in Figure 2 As shown in

[0028] Further optimization scheme, the filter structure includes a high molecular filter screen 2 fixedly connected with the nickel-titanium self-expanding stent 1, and the high molecular filter screen 2 is matched with the funnel structure.

[0029] Further optimization scheme, the pore size of the high molecular filter screen 2 is 100-300 microns.

[0030] This pore size is selected to effectively block thrombus while leaving a pore size for blood to pass through.

[0031] Further optimization scheme, the edge of the high molecular filter screen 2 is fixedly connected with the nickel-titanium self-expanding stent 1 through a nylon line 8.

[0032] Further optimization scheme, the cutting rod 11 of the part of the nickel-titanium self-expanding stent 1 close to the high molecular filter screen 2 is provided with a micro-hole 12, and the nylon line 8 passes through the edge grid of the high molecular filter screen 2 and the micro-hole 12 to fix the high molecular filter screen 2.

[0033] As shown in Figure 5 As shown in

[0034] When the device is inserted into a blood vessel with thrombus, as shown in Figure 6As shown in the middle, the thrombus is passed through the soft head end 6 of the development, and then the nickel-titanium self-expanding stent 1 is unfolded, at this time the cutting rod 11 drives the polymer filter screen 2 to be unfolded synchronously, the protection in the blood vessel is realized, then the thrombus falls off into the polymer filter screen 2, and effective collection is realized. When the thrombus needs to be cut, the thrombus is cut into small block structures, at this time the plurality of polymer filter screens 2 in the device play the effective blocking effect, such as Figure 7 As shown in the middle, the thrombus fragments are collected synchronously by the multi-stage polymer filter screen 2, so that the thrombus fragments cannot fall out of the protection of the device, and the health of the human body is prevented from being harmed by the fragments. The device makes the experience of the operator better, and the operation is safer and more reliable.

[0035] In the description of the present application, it should be understood that the terms "longitudinal", "transverse", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0036] The above-described embodiments are only used to describe the preferred modes of the present application, and do not limit the scope of the present application, and various modifications and improvements to the technical solutions of the present application made by those skilled in the art without departing from the design spirit of the present application should fall within the protection scope of the present application.

Claims

1. A self-expanding stent graft with a segmented filter, characterized in that, Include: The nickel-titanium self-expanding stent (1) is fixedly connected with a developing soft head end (6) at one end, and a push rod (7) at the other end. At least two funnel-shaped structures are formed on the nickel-titanium self-expanding stent (1) along the length direction by weaving, and the openings of the funnel-shaped structures face the push rod (7). A filter structure is fixedly connected in the funnel-shaped structure.

2. The self-expanding stent graft of claim 1, wherein: The funnel-shaped structure includes at least two connecting rods integrally formed with the nickel-titanium self-expanding stent (1). The connecting rods are equally spaced along the width direction of the nickel-titanium self-expanding stent (1) and are fixedly connected to a point to form a funnel shape with the nickel-titanium self-expanding stent (1).

3. The self-expanding stent graft of claim 2, wherein: The connecting rods are fixed to a point by soldering or dispensing.

4. The self-expanding stent graft of claim 2, wherein: The connecting rods in the same funnel-shaped structure are externally sleeved with the same developing ring.

5. The self-expanding stent of claim 1, wherein: The filter structure includes a high molecular filter screen (2) fixedly connected with the nickel-titanium self-expanding stent (1), which is matched with the funnel-shaped structure.

6. The self-expanding stent graft of claim 5, wherein: The pore size of the high molecular filter screen (2) is 100-300 microns.

7. The self-expanding stent of claim 5, wherein: The edge of the high molecular filter screen (2) is fixedly connected with the nickel-titanium self-expanding stent (1) by a nylon line (8).

8. The self-expanding stent of claim 5, wherein: The cutting rod (11) of the nickel-titanium self-expanding stent (1) near the high molecular filter screen (2) is provided with a micropore (12), and the nylon line (8) passes through the edge grid of the high molecular filter screen (2) and the micropore (12) to fix the high molecular filter screen (2).

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