Y-shaped thrombectomy stent and stent conveying system

Abstract

The utility model discloses a Y-shaped thrombectomy stent and a stent conveying system. The Y-shaped thrombectomy stent comprises two branch stents and a connecting part, the two branch stents are both of a net structure, and the connecting part is used for connecting the conveying system and the two branch stents; the two branch stents and the connecting part form a Y-shaped structure; the thrombectomy stent can be suitable for thrombectomy of the blood vessel bifurcation, such as the middle cerebral artery, the tip of the basilar artery and the tail end of the internal carotid artery, thrombectomy times can be reduced, operation time can be shortened, the blood vessel recanalization rate can be increased, symptomatic bleeding risks are not increased, and good prognosis is improved.

Description

Technical Field

[0001] The utility model relates to the field of medical equipment, and in particular to a Y-shaped thrombus removal bracket and a bracket delivery system. Background Art

[0002] At present, the mainstream treatment methods for thrombosis are mainly intravenous thrombolysis and mechanical interventional thrombectomy; the time window for intravenous thrombolysis is narrow, and the treatment effect is not obvious. The larger the diameter of the blocked blood vessel, the worse the thrombolysis effect. In addition, the treatment time window for intravenous thrombolysis is short, and it is easy to miss the best treatment time. The vascular recanalization rate is low, and there will be poor recovery of neurological function after treatment. Mechanical thrombectomy can complete vascular recanalization in a short time and reduce the occurrence of thrombosis recurrence. Compared with intravenous thrombolysis, mechanical thrombectomy takes less time, has lower risks, and has a high vascular patency rate, which can significantly improve the patient's prognosis;

[0003] Defects and shortcomings of the existing technology:

[0004] Currently, mechanical thrombectomy is ineffective in treating occluded blood vessels and heavy thrombus loads at bifurcated sites such as the middle cerebral artery, the tip of the basilar artery, and the terminal end of the internal carotid artery. Repeated single-stent thrombectomy will cause a very high possibility of vascular damage or even rupture, and the probability of blood vessel unblocking is low. The use of double stents for thrombectomy surgery is time-consuming and the overall cost of the operation is high. Utility Model Content

[0005] The utility model provides a Y-shaped thrombus removal stent and a stent delivery system, which can at least solve one problem pointed out in the background technology.

[0006] A Y-shaped thrombectomy stent, comprising:

[0007] Two branch stents, both of which are mesh structures; and

[0008] A connecting part, used for connecting the delivery system and two branch stents;

[0009] The two branch brackets and the connecting part form a Y-shaped structure.

[0010] The two branch brackets are both provided with a plurality of developing parts distributed along the axial direction of the branch brackets.

[0011] Each group of the developing parts includes at least two developing points distributed on the cross section of the branch support.

[0012] Preferably, the head end of the branch bracket is connected to a distal developing spring.

[0013] Preferably, the branch bracket is a mesh structure made of memory alloy.

[0014] A stent delivery system, comprising the above-mentioned thrombus removal stent, further comprising a push wire, a reinforcing tube and a proximal development spring, wherein the proximal development spring is sleeved at the distal end of the push wire and flush with the connecting portion, and the reinforcing tube is sleeved outside the proximal development spring;

[0015] Preferably, the push wire has a PTFE coating.

[0016] Preferably, the reinforcing tube is fixed to the surface of the proximal developing spring by heat shrinkage.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: the thrombectomy stent of the present invention is suitable for thrombectomy at vascular bifurcations, such as the middle cerebral artery, the tip of the basilar artery, the terminal end of the internal carotid artery, etc., which can reduce the number of thrombectomy times, shorten the operation time, increase the vascular recanalization rate, do not increase the risk of symptomatic bleeding, and improve good prognosis. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the structure of the thrombus removal bracket of the utility model;

[0019] Figure 2 This is a schematic diagram of the structure of the conveying system of the utility model;

[0020] Figure 3 This is a schematic diagram of the thrombus removal process of the thrombus removal stent of the present invention;

[0021] Figure 4 This is a schematic diagram of the structure of the push tube assembly of the utility model.

[0022] Description of reference numerals:

[0023] 1-branch stent, 2-connecting part, 3-developing point, 4-distal developing spring, 5-pushing wire, 6-reinforcing tube, 7-proximal developing spring, 8-protective sleeve, 9-microcatheter, 10-microguide wire, 11-pushing tube assembly, 12-flexible guide. DETAILED DESCRIPTION

[0024] A specific implementation of the present utility model is described in detail below in conjunction with the accompanying drawings, but it should be understood that the protection scope of the present utility model is not limited by the specific implementation mode.

[0025] Embodiment 1

[0026] like Figure 1 As shown, a Y-shaped thrombectomy stent provided in an embodiment of the utility model comprises a connecting portion 2 and two branch stents 1 forming a Y-shaped structure, wherein the connecting portion 2 is used to connect the stent delivery system and the two branch stents 1;

[0027] The branch stent 1 is a mesh structure made of a memory alloy, and can be made of a material with superelasticity and shape memory, such as a NiTi alloy material. After being heat-treated and shaped, it can remember the shaped shape. It has two states, contraction and expansion. It is in a contracted state in the sheath. When the sheath is removed, it expands in the radial direction and returns to its original shape.

[0028] The purpose of designing the thrombectomy stent as a double-branch stent in this embodiment is to be suitable for thrombectomy at the bifurcation of blood vessels, such as the middle cerebral artery, the tip of the basilar artery, the terminal of the internal carotid artery, etc., which can reduce the number of thrombectomy times, shorten the operation time, increase the rate of vascular recanalization, do not increase the risk of symptomatic bleeding, and improve good prognosis;

[0029] In addition, the two branch stents 1 are provided with a plurality of groups of developing parts distributed along the axial direction of the branch stent 1; wherein each group of developing parts includes at least two developing points 3 distributed on the cross section of the branch stent 1, and this design can facilitate observation of the position of the thrombus removal stent and the expansion state of the thrombus removal stent at the thrombus;

[0030] In addition, the head end of the branch stent 1 is connected to a distal developing spring 4, which is made of a developing material, preferably a platinum-tungsten alloy material, and is fixed to the head end of the branch stent 1 by bonding / welding.

[0031] Embodiment 2

[0032] like Figure 2-Figure 4 As shown, this embodiment proposes a stent delivery system connected to the thrombectomy stent on the basis of the first embodiment, including a push wire 5, a reinforcing tube 6 and a proximal developing spring 7, the proximal developing spring 7 is made of a developing material, preferably a platinum-tungsten alloy material, the proximal developing spring 7 is inserted into the distal end of the push wire 5 until it is aligned with the proximal end of the connecting portion 2, the connection is fixed by gluing / welding, and then the reinforcing tube 6 is inserted into the push wire 5 to cover the proximal developing spring 7, and is fixed by heat shrinking;

[0033] The push wire 5 of this embodiment can be a stainless steel wire / nickel titanium wire with a PTFE coating and a Mark mark on the proximal end;

[0034] The reinforcing tube 6 of this embodiment is a polymer material tube, preferably pebax material, and is fixed to the surface of the proximal developing spring 7 by bonding / heat shrinking;

[0035] In addition, it also includes a protective cover 8, which is a polymer material tube, preferably PTFE material, and is inserted from the distal end of the branch stent 1 to play a protective and fixing role. The protective cover 8 needs to be removed before use;

[0036] Since the delivery of the Y-shaped thrombectomy stent is a difficult problem in this industry, this embodiment also improves the existing microcatheter structure as follows: Figure 3As shown, the head end of the microcatheter 9 is provided with two symmetrical flexible guides 12, and the microguide wire 10 can stretch the two flexible guides 12 and pass between the two flexible guides 12. The microguide wire 10 penetrates into the body from the patient's femoral artery and reaches the position of the large blood vessels in the brain under fluoroscopic monitoring, and then is sent into the microcatheter 9 as a delivery conduit for the thrombus removal stent. Then a push tube assembly 11 is sent to the head end of the microcatheter 9. The push tube assembly 11 is fixedly connected to a guide wire, and the guide wire is pushed so that the two tubular parts of the push tube assembly 11 pass through the thrombus of the branch blood vessel respectively under the action of the flexible guide 12, and the thrombus removal stent is pushed to the push tube assembly 11 through the push wire 5. After adjustment, the two branch stents 1 are respectively entered into the two tubular parts to reach the thrombus position, and the push tube assembly 11 is withdrawn, and the thrombus removal stent self-expands and opens, and then the microcatheter system, the delivery system, and the thrombus removal stent are withdrawn to remove the thrombus captured in the stent mesh out of the body and restore normal blood flow.

[0037] like Figure 4 As shown, a clearance groove is provided on the push tube assembly 11 to facilitate the separation of the push tube assembly and the bracket part.

[0038] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit and basic features of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim involved.

[0039] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A Y-shaped thrombus removal stent, characterized in that: include: The two branch brackets (1) are both mesh structures; as well as A connecting portion (2) used for connecting the conveying system and the two branch stents (1); The two branch brackets (1) and the connecting portion (2) form a Y-shaped structure; Both of the two branch brackets (1) are provided with a plurality of groups of developing parts distributed along the axial direction of the branch bracket (1).

2. The Y-shaped thrombus removal stent according to claim 1, characterized in that: Each group of the developing parts comprises at least two developing points (3) distributed on the cross section of the branch support (1).

3. The Y-shaped thrombus removal stent according to claim 1, characterized in that: The head end of the branch bracket (1) is connected to a distal developing spring (4).

4. The Y-shaped thrombus removal stent according to claim 1, characterized in that: The branch bracket (1) is a mesh structure made of memory alloy.

5. A stent delivery system, characterized in that: The thrombus removal bracket comprises the thrombus removal bracket according to any one of claims 1 to 4, and further comprises a push wire (5), a reinforcing tube (6) and a proximal developing spring (7), wherein the proximal developing spring (7) is sleeved on the distal end of the push wire (5) and is flush with the connecting portion (2), and the reinforcing tube (6) is sleeved outside the proximal developing spring (7).

6. The stent delivery system according to claim 5, characterized in that: The pushing wire (5) has a PTFE coating.

7. The stent delivery system according to claim 5, characterized in that: The reinforcing tube (6) is fixed to the surface of the proximal developing spring (7) by heat shrinkage.

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