Thrombus removing device

A technology of tooling and mesh stents, applied in the field of medical devices, can solve problems such as prolonging operation time, falling off of thrombus, and increasing patient pain

Pending Publication Date: 2019-01-18
CHANGZHOU KEYNEUT MEDICAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, according to clinical reports, when the device is used for thrombus removal, because the distal stent is designed with an opening, the ability to capture the thrombus is weak, and the thrombus is very easy to fall ...

Method used

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preparation example Construction

[0066] The present invention also provides a method for preparing the mesh support in the above-mentioned thrombectomy device, comprising:

[0067] Cylindrical or cylindrical bracket shaping tooling is adopted; the surface of the bracket shaping tooling is provided with a plurality of positioning points in spiral distribution;

[0068] Fixing one end of the superelastic wire to one end of the tooling for stent shaping, then advancing along the positioning point and weaving to obtain a mesh stent structure; the mesh gap at one end of the mesh stent structure is smaller than the mesh gap at the other end;

[0069] The net-like support structure is heated and shaped, and the net-like support is obtained after cooling.

[0070] The present invention adopts cylindrical or cylindrical bracket shaping tooling to weave superelastic wire; the bracket shaping tooling is preferably formed of high melting point materials, more preferably formed of one or more of copper, stainless steel an...

Embodiment 1

[0086] The length of the mesh stent is 30mm, the diameter of the stent is 5.5mm; the length of the outer tube is 180cm; the diameter of the outer tube is 0.60mm.

[0087] In this embodiment, the size matches the microcatheter with an inner diameter of 0.021 inches, the length of the working area of ​​the stent is 30 mm, and the diameter is 5.5 mm.

[0088] Specifically, the superelastic wire used for braiding the thrombectomy stent is a nickel-titanium alloy wire with a diameter of 0.004 inches (0.0102 mm) containing 30% platinum that can be developed integrally. The preparation method of multi-filament weaving is adopted, the horizontal interval of the sparse part of the positioning point of the knitting tool is 7mm, the horizontal interval of the dense part is 5mm, the length ratio of the sparse part to the dense part is 3:1, and the length of the working area is 30mm with 12 wires, and the working diameter is 5.5mm. The mesh support ① is ready for use after heat treatment. ...

Embodiment 2

[0091] The scope of application of the present invention is further supplemented by matching microcatheters with an inner diameter of 0.013 inches, a stent working area length of 20.5 mm, a diameter of 2 mm, and a suitable vessel diameter of 0.5 mm to 2.5 mm.

[0092] Specifically, the superelastic wire used for braiding the thrombectomy stent is a nickel-titanium alloy wire with a diameter of 0.004 inches (0.0102 mm) containing 30% platinum that can be developed integrally. The preparation method of multi-filament weaving is adopted, the horizontal interval of the sparse part of the positioning point of the knitting tool is 2mm, the horizontal interval of the dense part is 1mm, the length ratio of the sparse part to the dense part is 2.5:1, and the length of the working area is 20.5mm and the diameter is 2mm. The mesh support ① is ready for use after heat treatment. The mandrel ② selects a nickel-titanium alloy wire with a diameter of 0.005 inches, and the outer tube ③ select...

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Abstract

The invention provides a thrombus removing device, comprising a thrombus removing bracket, a conveying system and a pushing handle. Compared with the prior art, the device makes the mesh stent adjustable according to the diameter of the blood vessel at the lesion position through the movement of the mandrel in the outer tube, and improves the matching property of the thrombectomy stent and the lesion blood vessel. At the same time, the mesh gap of reticular stent gradually narrows from proximal to distal end, and the mesh design of dense cooperation ensures that stent can be embedded into blood vessel quickly, and increases the combination and fishing capacity of stent and thrombus. Furthermore, increasing the density of the distal stent mesh can effectively prevent small thromboemboli from falling off the stent and reduce the damage to the vessel wall when the stent passes through the vessel. Finally, the distal end of the bracket is provided with a spring, which increases the flexibility of the thrombectomy bracket; Finally, the maneuverability of the bolt removing bracket is improved by the cooperation of the push handle shell and the push hand.

Description

technical field [0001] The invention belongs to the technical field of medical instruments, and in particular relates to a thrombectomy device. Background technique [0002] For the treatment of patients with ischemic stroke, the speed of thrombus clearance is a key indicator. If the rescue is not timely and the treatment is slow, it is likely to affect the prognosis. However, the thrombolytic effect of traditional chemical drugs is relatively slow, which cannot meet the speed requirements for the treatment of patients with acute ischemic stroke, which is why many stroke patients are either dead or disabled. [0003] Currently, there are two main treatment methods for intracranial thrombosis: drug thrombolysis and mechanical thrombectomy. [0004] Drug thrombolytic therapy is to inject a thrombolytic agent into the blood vessel where the lesion is located near the lesion, and form a high concentration of the thrombolytic agent in the local lesion instantaneously to acceler...

Claims

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Application Information

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IPC IPC(8): A61B17/221
CPCA61B17/221A61B2017/2215
Inventor 翁玉麟牛冬子刘宝瑞石全李委委
Owner CHANGZHOU KEYNEUT MEDICAL TECH CO LTD
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