A kind of stent delivery system

Abstract

The invention discloses a vascular stent conveying system which comprises a guide pipe unit and a conveying device for driving the guide pipe unit, wherein the guide pipe unit comprises an outer pipe and an inner pipe unit; the outer pipe comprises a vascular stent loading region; a vascular stent is arranged between the outer pipe and the inner pipe unit; the inner pipe unit comprises an inner pipe, a stent pushing unit, a connection pipe and a soft head; the stent pushing unit can be either integrated or split; the split type stent pushing unit comprises a connection rod and a pushing piece; the stent pushing unit is configured to not move the vascular stent when moving back to the near end; the conveying device comprises a shell and a reciprocating pushing mechanism; the near end of the outer pipe is connected with the shell; the near end of the inner pipe unit is inserted into the shell and is connected with the reciprocating pushing mechanism; the reciprocating pushing mechanism is arranged inside the shell and can do reciprocating motion of moving forwards and backwards in the shell; due to the reciprocating motion of the reciprocating pushing mechanism, the vascular stent can be released steadily and reliably.

Description

technical field [0001] The invention relates to a vascular stent delivery system, which belongs to the technical field of minimally invasive medical devices. Background technique [0002] Human arteries are channels that transport blood from the heart to various parts of the body. Due to lipid deposition and plaque formation on the inner wall of the arteries, the lumen of the arteries can be narrowed or even blocked. This process is called atherosclerotic occlusion, resulting in Arterial ischemia. Arteriosclerosis obliterans of the lower extremities is the narrowing or occlusion of the arterial lumen due to atherosclerosis, causing chronic ischemia of the lower extremities, resulting in a series of clinical symptoms and mechanisms, mainly manifested as early intermittent claudication, rest pain and tissue defects (ulcers and gangrene). [0003] At present, there are two main methods for the treatment of lower extremity arteriosclerosis obliterans: drug therapy and surgical...

AI Technical Summary

Problems solved by technology

[0005] Due to the different lengths of the occluded segments of the arteries of the lower extremities of patients clinically, the length of the vascular stent is limited, resulting in a longer delivery stroke of the delivery system, the structure of the delivery system is limited, and it is not convenient for medical staff to operate. There is a certain resistance during the delivery process, and the push mechanism of the delivery system also has a certain friction force, which leads to a large push force required for the delivery system, which can easily lead to unstable delivery of the stent, and may cause stent jumping, tremors, etc., which are serious. Or even cause the vascular stent to deviate, affecting the normal progress of the operation

When the clinically used stent is a braided stent, the stent is likely to be stretched or twisted and overlapped during the release process. , will affect blood vessel damage, and in severe cases, it is necessary to remove the stent through surgery, which will cause greater harm to the patient

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