Double sacculus device of expansion type bracket for bending section vascellum sacculus

Abstract

A double sacculus device used for a curve section blood saccule expansible support comprises a pipe fitting, sacculus arranged on the pipe fitting, a dispersion stress pipe arranged on the back of the pipe fitting and a connecting piece. The pipe fitting comprises an inner sleeve and an outer sleeve, which respectively form a guiding cavity, a first filling cavity and a second filling cavity; the saccule on the pipe fitting comprises a center saccule and an extension saccule; the saccule has a design of three folds and is closely parceled; the center saccule is positioned in the extension saccule by which the center saccule is parceled; the tops of both the center saccule and the extension saccule are connected with the inner sleeve, but connection points are at different location; the ends of the inner sleeve are connected with the outer sleeves respectively; the cavities of the inner sleeve is communicated with the first filling cavity and the second filling cavity respectively; in the dispersion stress pipe and the connection piece, a double-layer cavity that is inosculated with each cavity in the pipe fitting. The invention solves problems of the prior art and changes an operating process by which both ends of a saccule are expanded first, which makes the center part of the complete saccule expand firstly and get a good adherence, and then the two end parts begin to expand.

Description

technical field [0001] The invention relates to a device in the technical field of medical instruments, in particular to a double-balloon device used for a balloon-expandable stent in a curved section of blood vessels. Background technique [0002] At present, endovascular interventional therapy has exerted a strong advantage in the treatment of cerebrovascular diseases (such as coronary heart disease, peripheral blood vessels and cerebrovascular diseases). Compared with traditional surgery, it has the characteristics of less trauma, faster recovery, and fewer complications, which represents the direction of future treatment of vascular diseases. The basic treatment method is to introduce a balloon catheter or stent system into the lesion by percutaneous puncture, expand the narrow blood vessel or implant a stent at the same time, or use a covered stent to block the expanded blood vessel. After the operation, The balloon is then deflated and withdrawn from the body together...

AI Technical Summary

Problems solved by technology

In order to make the stent adhere to the wall well, the length of the balloon part is always slightly longer than the stent and protrudes slightly from both ends of the stent. This structural design is no problem when the lesion is located in the straight vessel segment. However, when the lesion is located in the vessel There is a disadvantage in the bending section of the stent: because the surface of the balloon slightly protruding from the two ends of the stent is not bound by the stent, it always expands before the middle part when it is expanded under force, and the result is the same in actual operation. Observing, we can see that the two ends expand first and then the middle stent expands again. When the lesion is located in the curved section, due to the different radii of the curved surface on both sides of the blood vessel, the degree of extension of the stent after release is also inconsistent. If the wall is adhered, it will limit the adherence of the middle part of the stent to a certain extent. This effect is more obvious when the stent graft is applied to the siphon segment of the intracranial artery, and the poor adherence of the stent will directly affect the follow-up. The incidence of complications such as stent migration, stent thrombosis, delayed endothelialization, and restenosis

[0004] After searching the literature of the prior art, it was found that the US invention patent US 5522882, "Method and apparatus for balloon expandable stent-graft delivery" (method and device for balloon expandable stent-graft delivery system), this patent describes a delivery ball The method and device of the delivery system of balloon-expandable stents, and also pointed out that this patent is also applicable to the delivery of non-covered balloon-expandable stents, but the covered stents used in this patent are mainly for the lesions of straight blood vessels. It is effective, but for tortuous blood vessels or curved blood vessels, the problem of poor occlusion effect will not be achieved, and the effect that the covered stent should produce cannot be achieved, and for the non-covered bare stent, there will also be poor adhesion

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