Double-layer embolectomy device

A double-layer, inner-layer technology, applied in the field of medical devices, can solve problems such as small thrombus falling off, vessel wall damage, dissection, and secondary embolism

Pending Publication Date: 2020-11-13
上海轩颐医疗科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the average vascular recanalization rate of the thrombectomy device has reached 82%, the proportion of severe intracranial hemorrhage and 90-day death of patients is still high. Part of the main reason is that the thrombectomy device causes damage to the vessel wall during the withdrawal of the thrombectomy device. Dissection, puncture leads to intracranial hem

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0047] Example 2

[0048] This embodiment is modified on the basis of Embodiment 1. Compared with Embodiment 1, this embodiment is different in that:

[0049] The weaving mode of the blocking net structure 3 in this embodiment and the grid shape of the formed blocking net structure 3 are different from those in Embodiment 1. Please refer to Figure 5 The tail end of the outer net 1 is provided with four outer threading holes A, B, C, D, and the far end of the inner net 2 is provided with four inner threading holes A, B, C, D, and two silk threads 301 are used, and their connection and weaving modes are A-b-C-d-A and a-B-c-D-a, and the silk thread 301 is connected with the outer threading holes. Figure 5 The overlapping petal shape shown in. Of course, in other embodiments, the number of silk threads 301 used is not limited, and the way of weaving and connecting the silk threads 301 is not limited. The density of the blocking net structure 3 can be determined according to the hardne...

Example Embodiment

[0051] Example 3

[0052] This embodiment is modified on the basis of Embodiment 1. Compared with Embodiment 1, this embodiment differs in that:

[0053] The inner grid element is at least a quadrilateral element. In this embodiment, refer to Figure 6 The preferred inner mesh unit is an irregular polygon, which can increase the bending radius of the inner mesh 2 and make it easier for the inner mesh 2 to pass through some extremely curved blood vessels.

[0054] Other structures and connection modes of the double-layer bolt-taking device are shown in Embodiment 1, which will not be repeated here.

Example Embodiment

[0055] Example 4

[0056] This embodiment is modified on the basis of Embodiment 1. Compared with Embodiment 1, this embodiment is different in that:

[0057] In this embodiment, refer to Figure 7 The outer net 1 includes a first outer mesh unit 101 and a second outer mesh unit 102, and the first outer mesh unit 101 and the second outer mesh unit 102 are arranged at intervals along the direction from the proximal end to the distal end of the outer net 1. And the first outer grid unit 101 and the second outer grid unit are connected by a connecting line 103; Adjacent columns are connected with each other along the circumferential direction of the outer layer net 1; In the circumferential direction of the outer mesh 1, the first outer mesh unit 101 and the second outer mesh unit 102 are connected between adjacent columns.

[0058] In this embodiment, refer to Figure 7 In the direction from the proximal end to the distal end of the outer mesh 1, it is preferable that some connecting ...

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PUM

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Abstract

The invention discloses a double-layer embolectomy device which comprises an inner-layer net, an outer-layer net and a blocking net structure. The inner-layer net comprises a near-end and a far-end. The head end of the outer-layer net is connected with the near end of the inner-layer net; the grid unit density of the inner-layer net is greater than that of the outer-layer net; one end of the blocking net structure is connected with the tail end of the outer-layer net, and the other end of the blocking net structure is folded and connected with the far-end of the inner-layer net; and the blocking net structure is connected with the outer-layer net to form a network structure wrapping the inner-layer net. When the double-layer embolectomy device is used, the density degree of the blocking net structure can be determined according to the hardness degree of actual thrombus, the proper blocking net structure is selected, and therefore the thrombus capturing success rate is effectively increased, and the phenomenon that part of thrombus is broken, falls off and escapes is prevented; through special grid arrangement of the inner-layer net and the outer-layer net, the compliance and the supporting force of the double-layer embolectomy device are effectively balanced, the damage to blood vessels is reduced, and the thrombus capture capacity is further improved.

Description

technical field [0001] The invention belongs to the field of medical devices, and in particular relates to a double-layer thrombectomy device. Background technique [0002] Stroke is the second cause of death in the world, about 80% of which are caused by focal ischemic stroke (AIS) caused by arterial occlusion, and intracranial arterial hemorrhage only accounts for 20% of strokes. In stroke patients, it is mainly caused by embolization of large blood vessels (diameter ≥ 2mm), also called embolic cerebral infarction, and the fatality rate of such large blood vessel embolic cerebral infarction is 53%-92%. There are 3.25 million new cerebral thrombosis in our country every year. At present, a number of companies have successfully developed thrombectomy devices and put them into market use after passing clinical trials, from the earliest Merci thrombectomy device developed by CONCENTRIC MEDICAL to the penumbral thrombectomy device developed by American PENUMBRA, to the newer M...

Claims

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Application Information

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IPC IPC(8): A61B17/221
CPCA61B17/221A61B2017/2212
Inventor 王细建严祝奇浦峥峻程国庆吴文宇桑叶
Owner 上海轩颐医疗科技有限公司
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