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Surgical instrument for safe grasp and removal of thrombi and use method

A thrombus removal technology, applied in surgery, medical science, etc., can solve the problems of thrombus debris protection, secondary blockage, and difficulty in reaching, so as to avoid vascular perforation and solve surgical complications.

Active Publication Date: 2019-03-26
NORTHWESTERN POLYTECHNICAL UNIV
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As for the second problem, it is not difficult to understand, because all these interventional mechanical thrombectomy methods do not protect the thrombus fragments that may occur during the operation, so that after the thrombus fragments are generated, they are transmitted with the blood flow to more difficult-to-reach and Risk of treating smaller sized vessels, resulting in secondary occlusion

Method used

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  • Surgical instrument for safe grasp and removal of thrombi and use method
  • Surgical instrument for safe grasp and removal of thrombi and use method
  • Surgical instrument for safe grasp and removal of thrombi and use method

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Embodiment Construction

[0027] Now in conjunction with embodiment, accompanying drawing, the present invention will be further described:

[0028] In the process of studying how to safely and efficiently strip thrombus from blood vessels, we first studied the mechanical properties of thrombus in blood. Due to the stickiness of the thrombus, most thrombi will be firmly wedged in the vessel wall after formation. If the thrombus is directly dragged after the thrombus grabbing device grabs it, then excessive pulling force will be exerted on these vessels It will lead to vascular perforation and acute intracranial hemorrhage complications, endangering the life safety of patients. However, as a protein fibrous tissue, thrombus has a special mechanical property. Our research found that when a dynamic shear stress is applied to the thrombus surface, the viscosity of the thrombus will gradually decrease, and the degree of reduction is related to the frequency of dynamic shear stress, such as figure 1 As sho...

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Abstract

The invention relates to a surgical instrument for safe grasp and removal of thrombi and a use method. The surgical instrument is characterized by including a three-dimensional tapered structure and alink structure. A distal protection head is disposed at a tapered end of the three-dimensional tapered structure, the link structure is disposed at the open end of three-dimensional tapered structure, and the main body of three-dimensional tapered structure adopts a reticular three-dimensional tapered structure, which includes a hollow reticular structure composed of an axial part and a circumferential part. The three-dimensional tapered structure adopts a shape memory material with biocompatibility. In all circumferential directions, the surface of the shape memory material is also coated with another biocompatible material at the same time. The shape memory material with biocompatibility and the other biocompatible material have mismatching thermal expansion coefficients. The surgical instrument provided by the invention can well solve the two problems of surgical complications caused by acute cerebral vascular rupture and secondary thrombus blockage caused by intraoperative thrombus debris in the field of interventional mechanical thrombectomy at present.

Description

technical field [0001] The invention belongs to surgical instruments, and relates to a safe grasping and removing thrombus surgical instrument and a use method, and relates to a newer and safer surgical instrument and a use method for intervening, grasping and removing intravascular thrombus. Background technique [0002] Stroke is the second leading cause of death worldwide, 80% of which are focal ischemic strokes caused by arterial embolism. It refers to a stroke caused by an emboli formed by a blood clot, creating an acute blockage in the vascular system, preventing blood flow and depriving surrounding brain tissue of oxygen. In the absence of oxygen, brain cells in the immediate area begin to die and release a series of toxic chemicals that threaten brain tissue cells in the surrounding area. In patients with ischemic stroke, when the vessel diameter is greater than 1 mm, the mortality rate of embolic cerebral infarction is 53%-92%. However, acute ischemic stroke can b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B17/221
CPCA61B17/221A61B2017/22038A61B2017/2212
Inventor 罗建军孙浩师用任仲靖苏笑宇
Owner NORTHWESTERN POLYTECHNICAL UNIV
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