Thrombus extraction stent and thrombus extraction device

A closed-loop, mesh-unit technology, used in medical science, surgery, etc., can solve the problems of cerebral vasospasm, poor adherence and compliance, and small radial support force of thrombus, and achieve the effect of dragging thrombus.

Pending Publication Date: 2017-08-18
XINKAINUO MEDICAL TECH SHANGHAI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to propose a thrombectomy support, through the small mesh design of the distal end and the large mesh design of the second closed-loop mesh unit in the middle, it solves the problem that the radial support force is relatively weak when catching thrombus in the prior art. Small, the problem that the thrombus is easy to fall off when the stent body is withdrawn
[0007] Another object of the present invention is to propose a thrombus removal device, which solves the problem that the thrombus is easy to fall off when the thrombus removal device in the prior art is working, and the wall adhesion and flexibility are poor, and it is easy to cause spasm of the cerebral blood vessels of the patient.

Method used

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  • Thrombus extraction stent and thrombus extraction device
  • Thrombus extraction stent and thrombus extraction device
  • Thrombus extraction stent and thrombus extraction device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] The invention provides a thrombus retrieval bracket for a thrombus retrieval device, such as figure 1 , 2 , 4, including: a stent body 100 self-expanding along its longitudinal axis and circumferential direction, the stent body 100 includes a distal portion 110, a middle portion 120, and a proximal portion 130 connected with the push rod 200 in sequence, The distal portion 110 includes a first closed-loop network unit 201, a plurality of the first closed-loop network units 201 are connected to each other to form a sleeve structure, and the distal portion 110 is an open sleeve structure; the middle portion 120 includes A plurality of second closed-loop network units 202, a plurality of the second closed-loop network units 202 are connected to each other to form a sleeve structure, the proximal part 130 includes a plurality of third closed-loop network units 203, a plurality of the third closed-loop network units The units 203 are connected to each other to form a cone s...

Embodiment 2

[0063] Different from Example 1, as Figure 10 As shown, in order to further improve the flexibility of the middle part 120 when it is opened and the adherence to the blood vessel wall, the connection line of the node 305 of the second closed-loop network unit 202 located in the same sequence of the helical structure of the middle part 120 and the The included angle between the horizontal plane where the axis of the bracket body 100 is located is α, and the angle range of α is 20°-80°.

[0064] Correspondingly, as a complete spiral structure, the helical angle of the first closed-loop network unit 201 connected with one or more second closed-loop network units 202 and the third closed-loop network unit 203 is also the same as that of the second closed-loop network unit 202. Angle α matches.

Embodiment 3

[0066] The difference from Example 1 or Implementation 2 is that, if Figure 15 As shown, the first closed-loop network unit 201 includes two structural lines, each structural line includes the sinusoidal long-wave rod 301 and the sinusoidal short-wave rod 302 connected thereto, and one of the two end-to-end connected structural lines is The helical structure a and the other is the wavy structure b, and the helical structure a and the wavy structure b are alternately distributed. The first closed-loop network unit 201 composed of the helical structure a and the wave structure b alternately distributes, which improves the stent body 100 to have a large radial support force while retaining Improve the adherence and flexibility of the external contour to the vessel wall, so as to better adhere to the vessel wall and ensure that the thrombus is completely brought back during withdrawal. The dotted line in the figure indicates the helical structure, and the solid line indicates th...

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PUM

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Abstract

The invention relates to the technical field of medical apparatuses for internal medicine, and in particular to a thrombus extraction stent and a thrombus extraction device. The thrombus extraction stent comprises a stent main body which achieves self-expanding in a circumferential direction of a longitudinal axis, wherein the stent main body comprises a distal portion, a middle portion and a proximal portion connected to a push rod, and the distal portion, the middle portion and the proximal portion are sequentially connected; the distal portion comprises first closed-loop net units; the plurality of first closed-loop net units are mutually connected, so that a sleeve structure is defined; the middle portion comprises a plurality of second closed-loop net units; the plurality of second closed-loop net units are mutually connected, so that a sleeve structure is defined; the proximal portion comprises a plurality of third closed-loop net units; the plurality of third closed-loop net units are mutually connected, so that a taper-tube structure is defined; and both the first closed-loop net units and the third closed-loop net units are less than the second closed-loop net units in meshes. The invention also provides the thrombus extraction device. Due to small-mesh design of the distal portion and the proximal portion, thrombus displacement and falling-off are prevented from easily occurring in a withdrawal process. With large-mesh design of the middle portion, a thrombus can be conveniently taken out as a whole body.

Description

technical field [0001] The invention relates to the technical field of internal medicine medical devices, in particular to a thrombus retrieval bracket and a thrombus retrieval device. Background technique [0002] Stroke, also known as apoplexy, is a group of acute cerebrovascular diseases with cerebral ischemia and hemorrhagic injury symptoms as the main clinical manifestations, because of its high morbidity, high mortality, high disability rate, high recurrence rate and High economic burden and other characteristics seriously endanger the life, health and quality of life of the public. [0003] Stroke is divided into two types: ischemic stroke and hemorrhagic stroke, and ischemic stroke accounts for 70% to 80%. In patients with ischemic stroke, intracranial large vessel occlusion caused by various reasons has the most serious consequences and has always been a difficult point in treatment. The current treatment methods include intravenous drug thrombolysis, arterial drug...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B17/22A61B17/221
CPCA61B17/22A61B17/221A61B2017/2212A61B2017/00778A61B2017/00915A61B2017/00867
Inventor 赵振心
Owner XINKAINUO MEDICAL TECH SHANGHAI CO LTD
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