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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 hemorrhage. Another main reason is that some small thrombi fall off the thrombus removal net during thrombectomy and enter the next or lower level of blood vessels, causing secondary embolism. Current technology cannot use instruments to continue thrombus removal. , solving the above problems has far-reaching significance for the efficiency and prognosis of AIS thrombectomy

Method used

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Examples

Experimental program
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Effect test

Embodiment 2

[0048] This embodiment is a modification made on the basis of Embodiment 1. The difference between this embodiment and Embodiment 1 is:

[0049] The weaving mode of the blockade net structure 3 in the present embodiment and the grid shape of the blockade net structure 3 that form are different from embodiment 1, refer to Figure 5 The end of the outer layer net 1 is provided with four outer layer threading holes 104 of A, B, C, and D, and the far end of the inner layer net 2 is provided with four inner layer threading holes 203 of a, b, c, and d. A silk thread 301, whose connection weaving mode is: A-b-C-d-A and a-B-c-D-a, there is a cross when the silk thread 301 connects the outer layer threading hole 104 and the inner layer threading hole 203, and the blockade network structure 3 formed is as Figure 5 The overlapping petal shapes shown in . Of course, in other embodiments, the number of silk threads 301 used is not limited, and the way the silk threads 301 are braided and...

Embodiment 3

[0052] This embodiment is a modification made on the basis of Embodiment 1. The difference between this embodiment and Embodiment 1 is:

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

[0054] For other structures and connection methods of the double-layer thrombectomy device, refer to Embodiment 1, which will not be repeated here.

Embodiment 4

[0056] This embodiment is a modification made on the basis of Embodiment 1. The difference between this embodiment and Embodiment 1 is:

[0057] In this example, see Figure 7 , the outer mesh 1 comprises a first outer mesh unit 101 and a second outer mesh unit 102, along the direction from the proximal end to the far end of the outer mesh 1, the first outer mesh unit 101 and the second outer mesh The grid units 102 are arranged at intervals; and the first outer grid unit 101 is connected to the second outer grid through a connecting line 103; along the circumferential direction of the outer net 1, adjacent columns are connected to each other ; Along 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 example, see Figure 7 , along the direction from the proximal end to the distal end of the outer layer mesh 1, preferably part of the connection line 103 be...

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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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