Thrombus capturing device

Abstract

The utility model discloses a thrombus catching device which comprises a thrombus extraction support, a blocking support and identification blocks, the thrombus extraction support and the blocking support are respectively of a self-expansion and expansion structure, the identification blocks are respectively arranged at the far end and the near end of the thrombus extraction support and a catching middle section, and the identification blocks are respectively identified at the front end and the rear end of the catching middle section. The middle capturing section is an effective working section for capturing thrombus after the thrombus extraction stent is released and unfolded; the far end of the thrombectomy support is of an open structure after being expanded and unfolded, the blocking support is arranged at the opening of the far end of the thrombectomy support in a matched mode, and the blocking support is in a net bag face shape after being unfolded, is located in the unfolded thrombectomy support and forms a blocking face. According to the thrombus extraction support, the problem that broken thrombus escapes in the thrombus extraction process of the thrombus extraction support is better solved, the broken thrombus is prevented from blocking far-end blood vessels, the thrombus is more thoroughly captured and removed, and the treatment effect of mechanical thrombus extraction is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of medical devices, and more specifically to a thrombus capturing device. Background Art

[0002] Cerebral infarction is nerve tissue damage caused by local brain tissue ischemia and necrosis due to sudden blockage of cerebral blood flow. Cerebral infarction is the most common type of stroke and the main cause of death and disability in middle-aged and elderly people.

[0003] Objective: The clinical treatment of ischemic stroke mainly adopts two methods: drug thrombolysis and mechanical thrombectomy.

[0004] Drug thrombolysis is mainly suitable for smaller thrombi, and cannot achieve ideal therapeutic effects for large thromboembolic events. Drug thrombolysis has great limitations in treatment.

[0005] Mechanical thrombectomy is to deliver the thrombectomy device to the embolism site, and then remove the thrombus out of the body through the thrombectomy stent. However, during the capture and extraction process, small pieces of thrombus or detached fragments are prone to escape and block distal blood vessels, causing secondary complications.

[0006] Chinese Patent: A thrombus removal stent and thrombus capture device, the authorization announcement number is: CN 111904675B. This utility model patent discloses a thrombus removal stent. From its disclosed content, it can be seen that the thrombus removal stent improves the structure of the existing thrombus removal stent, so that it allows the fragmented thrombus to enter the second area through the opening area, and uses a gathering and closing structure in the second area to block the fallen fragmented thrombus, prevent small fragments of thrombus from escaping during the capture and extraction process, and improve the effect of thrombus removal.

[0007] This technical solution is based on the structure of the existing technology and further improves and perfects the structure of the existing thrombectomy stent, so as to better solve the problem of escape of thrombus fragments during the process of capturing and extracting thrombi by the thrombectomy stent, prevent small thrombi from blocking distal blood vessels, more thoroughly capture and remove thrombi, and improve the therapeutic effect of mechanical thrombectomy. Utility Model Content

[0008] The utility model discloses a thrombus capturing device and a thrombus removing system, the main purpose of which is to overcome the above-mentioned deficiencies and shortcomings of the prior art.

[0009] The technical solution adopted by the utility model is as follows:

[0010] A thrombus capture device comprises a thrombus retriever stent, an arresting stent and an identification block, wherein the thrombus retriever stent and the arresting stent are respectively self-expanding structures, the identification blocks are respectively arranged on the distal end, the proximal end and the capturing middle section of the thrombus retriever stent, and the identification blocks are respectively marked on the front and rear ends of the capturing middle section, the capturing middle section is an effective working section for capturing thrombus after the thrombus retriever stent is released and deployed; the distal end of the thrombus retriever stent is expanded and deployed to have an open structure, the arresting stent is cooperatively arranged at the distal opening of the thrombus retriever stent, and the arresting stent is in the shape of a net bag surface after being deployed, located inside the deployed thrombus retriever stent, and forms an arresting surface.

[0011] Furthermore, the grid density of the blocking stent after deployment is smaller than the grid density of the thrombus removal stent after deployment.

[0012] Furthermore, the blocking stent is in a concave surface shape after being deployed, and is concavely arranged along the distal end direction of the thrombus removal stent.

[0013] Furthermore, a plurality of barbs are arranged on the blocking bracket, and the barbs are hooked toward the inner side of the blocking bracket.

[0014] Furthermore, the barbs are distributed in a ring-shaped structure.

[0015] Furthermore, there are two arresting brackets, which are symmetrically arranged front and back, and form an arresting structure with a double-track arresting surface after being released and deployed.

[0016] Furthermore, it also includes a push-pull guide wire and a guide sheath, wherein the push-pull guide wire is connected to the proximal end of the thrombus removal stent, and the guide sheath is used to compress and fold the thrombus removal stent and the blocking stent and store them inside it.

[0017] A thrombus removal system comprises the thrombus capturing device.

[0018] It can be seen from the above description and explanation of the utility model that, compared with the prior art, the advantages of the utility model are:

[0019] Advantage 1: The utility model provides an intercepting bracket, and utilizes the intercepting net structure formed by the net bag after it is released and expanded to intercept tiny thrombus fragments and detached small pieces, so that they can be completely extracted and removed, avoiding the escape of small thrombus fragments during the capture and extraction process, thereby improving the therapeutic effect of thrombectomy.

[0020] Advantage 2: The utility model can further enhance the hooking and blocking of thrombus fragments by arranging a barbed hook on the blocking bracket, thereby preventing the fragments from detaching during the capture and extraction process. The structure is more reasonable and practical, and the thrombus removal and blocking effect is more prominent. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of the first embodiment of the utility model.

[0022] Figure 2 It is a structural schematic diagram of the first embodiment of the utility model when in use.

[0023] Figure 3 It is a partial enlarged structural schematic diagram of the thrombus removal bracket and the blocking bracket in the first embodiment of the utility model.

[0024] Figure 4 It is a structural schematic diagram of the second embodiment of the present utility model.

[0025] Figure 5 It is a structural schematic diagram of the second embodiment of the utility model when in use.

[0026] Among them, there are thrombus removal stent 1, distal end 11, proximal end 12, capture middle section 13, blocking stent 2, barb body 21, marking block 3, push-pull guide wire 4, and guide sheath 5. DETAILED DESCRIPTION

[0027] The specific implementation of the present utility model will be further described below with reference to the accompanying drawings.

[0028] Embodiment 1

[0029] like Figures 1 to 3 As shown, a thrombus capture device includes a thrombus retriever stent 1, an arresting stent 2 and an identification block 3. The thrombus retriever stent 1 and the arresting stent 2 are self-expanding structures. The identification blocks 3 are respectively arranged on the distal end 11, the proximal end 12 and the capturing middle section 13 of the thrombus retriever stent 1, and the identification blocks 3 are respectively marked on the front and rear ends of the capturing middle section 13. The capturing middle section 13 is an effective working section for capturing thrombus after the thrombus retriever stent 1 is released and expanded; and also includes a push-pull guide wire 4 and a guide sheath 5. The push-pull guide wire 4 is connected to the proximal end 12 of the thrombus retriever stent 1. The guide sheath 5 is used to compress and fold the thrombus retriever stent 1 and the arresting stent 2 and store them inside. By setting the arresting stent, the net bag-shaped arresting net structure formed after the arresting stent is released and expanded can be used to intercept small thrombus fragments and detached small pieces, so that they can be completely extracted and removed, to prevent small fragments of thrombus from escaping during the capture and extraction process, and to improve the therapeutic effect of thrombus removal.

[0030] like Figures 1 to 3As shown, the distal end 11 of the thrombus removal stent 1 is expanded and unfolded to form an open structure, and the blocking stent 2 is arranged at the opening of the distal end 11 of the thrombus removal stent 1. The blocking stent 2 is in the shape of a net bag surface after being unfolded, located inside the unfolded thrombus removal stent 1, and forms a blocking surface. The grid density of the blocking stent 2 after being unfolded is less than the grid density of the thrombus removal stent 1 after being unfolded. The blocking stent 2 is in the shape of a concave surface after being unfolded, and is concavely arranged along the distal end 11 of the thrombus removal stent 1. A plurality of barbs 21 are arranged on the blocking stent 2, and the barbs 21 are hooked toward the inner side of the blocking stent 1, and the barbs 21 are arranged in a ring-shaped structure. By arranging the barbs 21 on the blocking stent 2, the hooking and blocking of thrombus fragments can be further improved to prevent them from detaching during the capture and extraction process, and the structure is more reasonable and practical, and the effect of thrombus removal and blocking is more prominent.

[0031] When using:

[0032] Step 1: Confirmation of the location of the lesion: First, determine the specific location of the intracranial vascular lesion through angiography;

[0033] Step 2: Guidewire guidance: the guide sheath 5 is guided by a micro-guidewire into a human blood vessel from the femoral artery or the brachial artery and passes through the thrombus;

[0034] Step 3: Determine the placement position of the thrombus removal stent. After the guide sheath 5 passes through the thrombus, confirm that the identification block 3 at the distal end 11 of the thrombus removal stent 1 is located in front of the thrombus. Then confirm that the thrombus is located between the identification blocks 3 of the capture middle section 13 and is in an effective capture area. Finally, confirm that the identification block 3 at the front end 12 of the thrombus removal stent 1 is located behind the thrombus. The placement position of the thrombus removal stent is confirmed.

[0035] Step 4: releasing the arresting stent 2, withdrawing the guide sheath 5, so that the arresting stent 2 is released in the blood vessel, the arresting stent 2 expands and unfolds in front of the thrombus, and forms a net-shaped blocking mesh surface;

[0036] Step 5: releasing the thrombectomy stent 1, withdrawing the guide sheath 5, releasing the thrombectomy stent 1 in the blood vessel, expanding and unfolding the thrombectomy stent 1, and opening the capturing middle section 13 of the thrombectomy stent 1 in the thrombus, so that the thrombus enters the stent mesh of the unfolded thrombectomy stent;

[0037] Step 6: Pull out the thrombus. Use the push-pull guide wire 4 to pull the deployed thrombus removal stent 1 to drive the captured thrombus to be pulled back. During the process of pulling back, the small pieces of thrombus that fall off or fall off are blocked in the blocking stent 2, and the barbs 21 on the blocking stent 2 hook the blocked thrombus, and then remove it together with the withdrawal, so that the thrombus is captured and removed more completely.

[0038] Step seven: Fold, recycle and store. Continue to pull back the push-pull guide wire 4. The thrombus, thrombus removal stent 1 and blocking stent 2 are compressed, folded and stored in the guide sheath 5. Then, the guide sheath 5 is pulled out of the blood vessel and out of the human body to complete the thrombus removal operation.

[0039] Embodiment 2

[0040] like Figure 4 and Figure 5 As shown, the difference between this embodiment and the first embodiment is that there are two blocking stents 2 in this embodiment, which are arranged in a front-to-back correspondence, and the grid density of the blocking stent 2 at the proximal end is greater than the grid density of the blocking stent 2 at the distal end. By providing a double-layer blocking stent 2 arranged in front and back, the broken small thrombus blocks that fall off can be more thoroughly blocked and removed, thereby improving the effect of thrombus removal. The other structures are the same as those of the first embodiment, and will not be repeated here.

[0041] The above is only a specific implementation method of the utility model, but the design concept of the utility model is not limited to this. Any non-substantial improvement of the utility model using this concept should be regarded as an infringement of the protection scope of the utility model.

Claims

1. A thrombus capture device, characterized in that: The invention comprises a thrombus retriever stent, an arresting stent and an identification block, wherein the thrombus retriever stent and the arresting stent are respectively self-expanding structures, the identification blocks are respectively arranged on the distal end, the proximal end and the capturing middle section of the thrombus retriever stent, and the identification blocks are respectively marked on the front and rear ends of the capturing middle section, the capturing middle section is an effective working section for capturing thrombus after the thrombus retriever stent is released and deployed; the distal end of the thrombus retriever stent is expanded and deployed to form an open structure, the arresting stent is cooperatively arranged at the distal opening of the thrombus retriever stent, the arresting stent is in the shape of a net bag surface after deployment, is located inside the deployed thrombus retriever stent, and forms an arresting surface; the invention also comprises a push-pull guide wire and a guide sheath, the push-pull guide wire is connected to the proximal end of the thrombus retriever stent, the guide sheath is used to compress and fold the thrombus retriever stent and the arresting stent and store them inside it.

2. A thrombus capture device according to claim 1, characterized in that: The grid density of the arresting stent after deployment is smaller than the grid density of the thrombus removal stent after deployment.

3. A thrombus capturing device according to claim 1, characterized in that: The blocking stent is in a concave surface shape after being deployed, and is concavely arranged along the distal end direction of the thrombus removal stent.

4. A thrombus capturing device according to claim 1, characterized in that: A plurality of barbs are arranged on the blocking bracket, and the barbs are hooked toward the inner side of the blocking bracket.

5. A thrombus capturing device according to claim 4, characterized in that: The barbs are distributed in a ring-shaped structure.

6. The thrombus capturing device according to claim 1, characterized in that: There are two arresting brackets, which are symmetrically arranged front and back, and form an arresting structure with a double-track arresting surface after being released and deployed.

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