A kind of lumen stent delivery system

Abstract

The invention discloses a lumen bracket conveying system. The system comprises a handle shell and a linkage mechanism, wherein a sheath pipe, an inner core pipe and a push pipe are parallelly arranged on the handle shell; a sheath joint for connecting the sheath pipe and driving the sheath pipe to move and a push pipe joint for connecting the push pipe and driving the push pipe to move are arranged in the handle shell; the linkage mechanism is used for driving the sheath pipe and the push pipe synchronously through the sheath joint and the push pipe joint; the sheath joint and the push pipe joint are moved in opposite directions; and the ratio of the movement speed of the push pipe joint to the movement speed of the sheath joint is equal to the ratio of the axial shortening amount of a conveyed bracket to the natural length of the bracket. The conveying system has a bracket shortening self-adaption function; and due to the adoption of compensation movement of the push pipe and the inner core pipe towards a far end, the defect of the shortening rate of the bracket is overcome, so that the bracket cannot be influenced by the axial tension and drawing effects of the conveying system, the accurate positioning of the bracket is ensured, and the problem of damages of the bracket to the pipe wall of a human body is solved.

Description

technical field [0001] The invention relates to a medical device, in particular to an interventional delivery system for a luminal stent, which is especially suitable for the delivery, release and recovery of a luminal stent with a large shortening rate. Background technique [0002] In the field of interventional medicine, the technology of using stents to treat or alleviate stenosis or other lesions in human lumens is more and more widely used clinically. According to the scope of use of the product, the stent products currently on the market are mainly divided into two categories: vascular stents (such as aortic stents, peripheral vascular stents, etc.) ). This stent product technology generally adopts a compressible stent, compresses it into a hollow catheter, and passes through the puncture port of the human body lumen (such as arterial puncture, venipuncture, etc.) or the opening of human organs (such as mouth, nose, etc.) etc.), under the monitoring of digital image...

AI Technical Summary

Problems solved by technology

Therefore, the positioning point (such as the development point) at the distal end of the stent will move proximally with the shortening of the stent. After the stent is released, the distance of the distal positioning point moving can reach ΔL, resulting in inaccurate positioning of the stent, which is difficult for the operation. Bring great trouble, even cause the operation to fail

[0010] 2. Because the stent will be axially shortened during the release process, the distal part of the stent that has adhered to the wall will gradually move to the proximal end (or have a tendency to move) as the stent shortens in the human body cavity. Exercise is very likely to cause damage to the inner wall of the lumen

In addition, during the release process of the stent, since the distal end and proximal end of the stent are respectively restricted by the inner wall of the human body lumen and the delivery system, the incompletely shortened stent will have an axial stretching effect, making the distance between the stent and the inner wall of the human body lumen There is an axial force, which can easily cause damage to the inner wall of the lumen

[0011] 3. As mentioned above, using the common "Pin&Pull back" release method in the prior art, the stent is still in the "not completely shortened" state after the release is completed, which is actually a "stretched" state. This may result in a reduction in the radial support force of the stent

[0012] The above problems are all caused by the shortening of the stent during release and the inability of the delivery system to automatically adjust to this shortening

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