Thrombus capture stent assembly

Abstract

The present invention discloses a thrombus capture stent assembly, comprising a delivery tube, a stent traction tube, a stent connecting tube, and a thrombus capture stent, wherein the stent traction tube is nested in the through hole of the delivery tube, the stent connecting tube is nested in the through hole of the stent traction tube, the thrombus capture stent is connected to the distal end of the stent connecting tube, and the thrombus capture stent is configured to be able to flip along the length direction of the stent connecting tube and to be able to shrink in the stent traction tube. The present invention can ensure that the thrombus is cleanly removed without causing damage to the blood vessel, thereby reducing complications caused by embolism.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to a thrombus capturing stent assembly. Background Art

[0002] Thrombosis is a common pathological process in clinical practice. Intravascular thrombosis causes tissue ischemia and necrosis, affecting organ function and endangering life. Thrombosis can be seen in the atrium and ventricle, arteries, veins and microvessels.

[0003] For patients with severe thrombotic fibrosis, the effect of thrombolytic therapy is not very obvious. To quickly eliminate the thrombus, mechanical thrombectomy is a very fast and effective treatment method. Mechanical thrombectomy includes catheter aspiration and stent thrombectomy, but both of these thrombectomy methods have some common disadvantages. First, the thrombectomy operation generally requires 1-6 times to remove the thrombus. Such repeated operations can easily damage the blood vessels and cause blood vessel rupture. Secondly, in the process of aspirating and dragging the thrombus, the potential thrombus is broken, and the thrombus fragments flow into the deep blood vessels with the blood, causing secondary embolism.

[0004] Therefore, technicians in this field are committed to providing a thrombus capture stent assembly that can solve the complications of distal vascular embolism in traditional thrombus removal methods and can achieve the maximum thrombus removal. Summary of the invention

[0005] In view of the defects in the prior art, the technical problem to be solved by the present invention is how to provide a thrombus capture stent assembly that can solve the complications of distal vascular embolism in traditional thrombus removal methods and can achieve thrombus removal to the greatest extent.

[0006] To achieve the above-mentioned objectives, the present invention provides a thrombus capture stent assembly, comprising a delivery tube, a stent traction tube, a stent connecting tube, and a thrombus capture stent, wherein the stent traction tube is nested in the through hole of the delivery tube, the stent connecting tube is nested in the through hole of the stent traction tube, the thrombus capture stent is connected to the distal end of the stent connecting tube, and the thrombus capture stent is configured to be able to flip along the length direction of the stent connecting tube and to be able to shrink in the stent traction tube.

[0007] Furthermore, it also includes a delivery pipe joint, which is connected to the proximal end of the delivery pipe, and the stent connecting tube passes through the delivery pipe joint.

[0008] Furthermore, it also includes a stent traction pipe joint, the stent traction pipe joint is connected to the proximal end of the stent traction pipe, and the stent connecting pipe passes through the stent traction pipe joint.

[0009] Furthermore, it also includes a stent connecting pipe joint, which is connected to the proximal end of the stent connecting pipe.

[0010] Preferably, the thrombus capture stent is funnel-shaped, and the small-diameter end of the thrombus capture stent is connected to the stent connecting tube.

[0011] Preferably, the distal end of the stent pulling tube is a bell mouth, and the bell mouth of the stent pulling tube is configured to be able to be contracted in the delivery tube.

[0012] Furthermore, a developing block is provided in the circumference of the large diameter end of the thrombus capture stent, and the developing block is connected to the bell mouth of the stent traction tube through a connecting line.

[0013] Preferably, the connecting wire is made of nickel-titanium wire.

[0014] Preferably, the thrombus capture stent is made of polymer fiber.

[0015] Preferably, the distal end of the stent connecting tube is tapered.

[0016] The present invention has at least the following beneficial technical effects:

[0017] 1. The thrombus capture stent assembly provided by the present invention can remove the thrombus to the greatest extent by flipping the thrombus capture stent to cut the thrombus and then capture the thrombus by the flipped thrombus capture stent, thereby ensuring that the thrombus is completely removed without leaving any residue.

[0018] 2. The double guide wire thrombus cutting and thrombus capture stent assembly provided by the present invention, the thrombus capture stent is made of polymer material, which adheres closely to the blood vessel wall during thrombus removal and does not cause damage to the blood vessel; the funnel-shaped structure can effectively capture thrombus fragments while ensuring blood flow in the blood vessel.

[0019] 3. The double-guidewire thrombus cutting and thrombus capture stent assembly provided by the present invention can remove the thrombus in one go, reducing the number of surgical thrombus removal operations and the operation time, and can avoid the complications caused by distal vascular embolism caused by traditional thrombus removal technology.

[0020] The concept, specific structure and technical effects of the present invention will be further described below in conjunction with the accompanying drawings to fully understand the purpose, characteristics and effects of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic diagram of a thrombus capture stent assembly provided by a preferred embodiment of the present invention;

[0022] Figure 2 It is a schematic diagram of the contraction of the thrombus capture stent assembly provided by the preferred embodiment of the present invention;

[0023] Figure 3 It is a schematic diagram of the structure of the support connecting pipe provided by a preferred embodiment of the present invention;

[0024] Figure 4 It is a schematic diagram of the structure of the thrombus capture stent provided by a preferred embodiment of the present invention;

[0025] Figure 5 This is a schematic diagram of the connection of the thrombus capture stent provided in the preferred embodiment of the present invention;

[0026] Figure 6 This is a vertical view of a thrombus capture stent provided by a preferred embodiment of the present invention;

[0027] Figure 7 It is a schematic diagram of the stent assembly cutting and thrombus removal process provided by a preferred embodiment of the present invention.

[0028] In the figure, 1-delivery tube, 2-delivery tube joint, 3-stent traction tube, 4-stent traction tube joint, 5-stent connecting tube, 6-stent connecting tube joint, 7-thrombus capture stent, 71-thrombus capture stent curling edge, 72-developing block, 73-connecting line. DETAILED DESCRIPTION

[0029] The following describes several preferred embodiments of the present invention with reference to the drawings in the specification, so that the technical content is clearer and easier to understand. The present invention can be embodied in many different forms of embodiments, and the protection scope of the present invention is not limited to the embodiments mentioned in the text.

[0030] In the drawings, components with the same structure are indicated by the same numerical reference numerals, and components with similar structures or functions are indicated by similar numerical reference numerals. The size and thickness of each component shown in the drawings are arbitrarily shown, and the present invention does not limit the size and thickness of each component. In order to make the illustration clearer, the thickness of the components is appropriately exaggerated in some places in the drawings.

[0031] like Figure 1 As shown, a thrombus capture stent assembly provided by a preferred embodiment of the present invention includes a delivery tube 1, a delivery tube joint 2, a stent traction tube 3, a stent traction tube joint 4, a stent connecting tube 5, a stent connecting tube joint 6, and a thrombus capture stent 7. The delivery tube 1 and the stent traction tube 3 are tubular structures, the stent traction tube 3 is nested in the through hole of the delivery tube 1, and the stent connecting tube 5 is nested in the through hole of the stent traction tube 3. The thrombus capture stent 7 is located at the distal end of the stent connecting tube 5 and is connected to the stent connecting tube 5. The delivery tube joint 2 is connected to the proximal end of the delivery tube 1, and the stent traction tube 3 passes through the delivery tube joint 2; the stent traction tube joint 4 is connected to the proximal end of the stent traction tube 3, and the stent connecting tube 5 passes through the stent traction tube joint 4; the stent connecting tube joint 6 is connected to the proximal end of the stent connecting tube 5.

[0032] In the present invention, the end of the thrombus capture stent assembly close to the operator is the proximal end, and the other end opposite is the distal end. That is, the end where the stent connection pipe joint 6 is located is the proximal end, and the end where the thrombus capture stent 7 is located is the distal end.

[0033] The thrombus capture stent 7 can be flipped along the length direction of the stent connecting tube 5, and the length direction of the stent connecting tube 5 refers to the direction from the proximal end to the distal end or the distal end to the proximal end. The flipping of the thrombus capture stent 7 means that the outer edge of the thrombus capture stent 7 flips from one side to the other side relative to the inner edge. During the flipping process, the thrombus is cut off from the blood vessel wall, and the fallen thrombus is collected by the flipped thrombus capture stent 7. This flipping method avoids the situation where the traditional thrombus removal stent cuts and drags the thrombus, causing the thrombus to break and flow with the blood to the deep part of the blood vessel, causing secondary embolism.

[0034] The thrombus capture stent 7 can also be retracted in the stent traction tube 3. Figure 2 As shown, before reaching the thrombus position, the stent traction tube 3 is retracted in the delivery tube 1, and the thrombus capture stent 7 is retracted in the stent traction tube 3. The stent traction tube joint 4 is operated to achieve the retraction of the stent traction tube 3; the stent connection tube 5 is driven by operating the stent connection tube joint 6 to achieve the retraction of the thrombus capture stent 7.

[0035] like Figure 3 As shown, the distal end of the stent traction tube 3 of this embodiment is a bell mouth. When thrombus removal is performed, the bell mouth is located between the thrombus capture stent 7 and the distal end of the delivery tube 1.

[0036] The bell mouth of the stent traction tube 3 is made of elastic and soft material, and can be freely expanded and released in the delivery tube 1 without causing damage to the blood vessel wall. When the stent traction tube 3 is contracted in the delivery tube 1, the bell mouth is also contracted in the delivery tube 1.

[0037] like Figure 4 and Figure 5 As shown, in this embodiment, the thrombus capture stent 7 is funnel-shaped, and the small diameter end of the thrombus capture stent 7 is connected to the stent connecting tube 5 to form an inner edge; the large diameter end of the thrombus capture stent 7 forms an outer edge, which can be flipped from one side to the other side relative to the inner edge along the length direction of the stent connecting tube 5. In this embodiment, the outer edge of the thrombus capture stent 7 is in a certain curved shape, forming a thrombus capture stent curling edge 71, which can facilitate the stretching and flipping of the thrombus capture stent 7 during surgery.

[0038] The large diameter end of the thrombus capture stent 7 is provided with a developing block 72 in the circumferential direction, and the developing block 72 is connected to the outer edge of the bell mouth of the stent traction tube 3 through a connecting line 73, and the thrombus capture stent 7 can be turned over by pulling the stent traction tube 3. In this embodiment, the number of the developing blocks 72 and the connecting lines 73 are both four, and the developing blocks 72 are arranged at 90 degrees in the circumferential direction of the outer edge of the thrombus capture stent 7.

[0039] like Figure 6 As shown, the outer diameter of the outer edge of the flared mouth of the stent traction tube 3 is consistent with the outer diameter of the thrombus capture stent curling edge 71, which can better drag the thrombus capture stent 7.

[0040] In this embodiment, the thrombus capture stent 7 is woven from polymer fibers, and the mesh of the thrombus capture stent 7 can capture thrombus fragments as small as 40 microns while maintaining blood flow in the blood vessel.

[0041] In this embodiment, the material of the connecting wire 73 is super elastic nickel titanium wire.

[0042] like Figure 4 and Figure 6 As shown, the distal end of the stent connecting tube 5 is of a conical design, and the aperture can be adapted to a 0.038-inch guide wire. The conical design can reduce the resistance of the tube when it is pushed in the blood vessel.

[0043] The developing block 72 realizes the positioning of the thrombus capturing stent 7 in the blood vessel and realizes accurate thrombus capturing. The material of the developing block 72 can be platinum-iridium alloy.

[0044] In other embodiments of the present invention, the shape of the thrombus capturing stent 7 is not limited to the funnel shape.

[0045] like Figure 7 The figure shows a schematic diagram of the process of the thrombus capture stent assembly of this embodiment flipping and capturing thrombus in the blood vessel. During the thrombus removal operation, after the delivery tube 1 passes through the thrombus position along the guide wire, the delivery tube 1 is withdrawn, and the thrombus capture stent 7 will be released; the delivery tube 1 is continued to be withdrawn, and the distal horn of the stent traction tube 3 is released. During the operation, the stent traction tube 3 is dragged, and the stent traction tube 3 drags the connecting line 73, and the connecting line 73 flips the thrombus capture stent 7. During this process, the thrombus capture stent curling edge 71 is tightly attached to the blood vessel wall, which will not cause damage to the blood vessel wall. The thrombus on the blood vessel wall is cut and collected by the thrombus capture stent 7. After the thrombus removal is completed, the stent traction tube 3 and the thrombus capture stent 7 are retracted together in the delivery tube 1, and then the delivery tube 1 is withdrawn from the human body along the guide wire.

[0046] The preferred specific embodiments of the present invention are described in detail above. It should be understood that ordinary technicians in the field can make many modifications and changes based on the concept of the present invention without creative work. Therefore, all technical solutions that can be obtained by technicians in the technical field based on the concept of the present invention through logical analysis, reasoning or limited experiments on the basis of the prior art should be within the scope of protection determined by the claims.

Claims

1. A thrombus capture stent assembly, characterized in that: It comprises a delivery tube, a stent traction tube, a stent connecting tube, and a thrombus capture stent, wherein the stent traction tube is nested in the through hole of the delivery tube, the stent connecting tube is nested in the through hole of the stent traction tube, the thrombus capture stent is connected to the distal end of the stent connecting tube, the thrombus capture stent is configured to be able to flip along the length direction of the stent connecting tube and to be able to shrink in the stent traction tube, the thrombus capture stent is funnel-shaped, the small-diameter end of the thrombus capture stent is connected to the stent connecting tube, the thrombus capture stent is made of polymer fiber, the distal end of the stent traction tube is a bell mouth, and the bell mouth of the stent traction tube is configured to be able to shrink in the delivery tube; The large diameter end of the thrombus capture stent constitutes an outer edge, and the outer edge is bent outward to form a curled edge of the thrombus capture stent; a developing block is arranged circumferentially on the large diameter end of the thrombus capture stent, and the developing block is connected to the bell-shaped mouth of the stent traction tube by a connecting line; the number of the developing blocks and the connecting lines are both four, and the developing blocks are arranged at 90° on the circumference of the outer edge of the thrombus capture stent.

2. The thrombus capture stent assembly according to claim 1, characterized in that: It also includes a delivery pipe joint, which is connected to the proximal end of the delivery pipe, and the support connecting tube passes through the delivery pipe joint.

3. The thrombus capture stent assembly according to claim 1, characterized in that: It also includes a stent traction pipe joint, which is connected to the proximal end of the stent traction pipe, and the stent connecting pipe passes through the stent traction pipe joint.

4. The thrombus capture stent assembly according to claim 1, characterized in that: It also includes a bracket connecting pipe joint, which is connected to the proximal end of the bracket connecting pipe.

5. The thrombus capture stent assembly according to claim 1, characterized in that: The connecting wire is made of nickel-titanium wire.

6. The thrombus capture stent assembly according to claim 1, characterized in that: The distal end of the support connecting tube is tapered.

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