A special main and lateral branch balloon stent system for interventional treatment of bifurcation lesions

Abstract

The invention belongs to the field of medical instruments and discloses a special-type main and side branch saccule stent system for interventional therapy of bifurcation lesions. The system comprises a special-type main branch saccule stent system and a special-type side branch saccule stent system, wherein a main branch saccule has a side branch channel, and a side branch saccule has a trumpet-type side branch saccule special-type end attached to a side branch opening after expanding. The main and side branch saccule stent system can realize accurate positioning, is convenient to operate, can be better attached to a blood vessel wall and has better clinical application effects.

Description

technical field [0001] The invention belongs to the field of medical devices and relates to a special-type main side branch balloon stent system for interventional treatment of bifurcation lesions. Background technique [0002] Bifurcation lesions are relatively common in clinical practice. Some "false" bifurcation lesions (severe stenosis of the main branch vessels, no obvious stenosis of the branch vessels) also become "true" bifurcation lesions (main branch and branch vessels) due to plaque displacement during interventional treatment. The branch vessels were markedly narrowed). Interventional therapy for bifurcation lesions has improved the short-term effect, but the long-term effect is still unsatisfactory. Drug-eluting stents can significantly reduce vascular restenosis after interventional therapy. However, for bifurcation lesions, the restenosis rate of the main branch decreased significantly, but the restenosis and thrombus problems of side branches remained unso...

AI Technical Summary

Problems solved by technology

In addition to the relatively complicated operation, for example, the guide wire is not easy to pass through the mesh of the main branch stent and enter the side branch vessels, and the balloon may rupture when it passes through or expands the mesh, etc. Others include: 1. Possible damage when the guide wire is withdrawn The opening of the side branch or the displacement of the stent; Second, the entry of the side branch guide wire through the mesh of the main branch stent or the passage of the main branch guide wire through the mesh of the side branch stent cannot ensure that the guide wire is well positioned on the central axis of the vascular lumen. During the balloon expansion process, the force on the vessel wall will be affected by uncertainty; 3. There is an unnecessary layer or two layers of metal mesh at the opening of the side branch, and some main stents may have three layers of metal mesh at both ends, increasing Fourth, if there are many side branch stents protruding from the main branch, the balloon is longer in the main branch. When the main branch balloon expands, the side branch stent migrates into the side branch, which increases the damage to the tube wall and is easy tearing of the inner membrane

5. There are too many parallel parts of the two balloons during kissing expansion, which may cause the gap at the acute angle of the opening to become longer and the obtuse angle to be over-expanded; 6. Traditional balloon expansion and stent release do not achieve the opening of the side branch The good fit of the arc-shaped transition zone in physical form is also one of the reasons for the easy formation of side branch restenosis and thrombosis after operation; shape uncertainty etc.

The main reasons for these problems may be that the operator is limited to the current instrumentation, the lack of a stent and balloon tailored to the physical shape of the bifurcation vessel opening, and the lack of a suitable balloon stent delivery system

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