Delivery system for expandable stents

Abstract

The invention provides a delivery system for an expandable stent and relates to the technical field of stent delivery. The delivery system comprises an inner core assembly, wherein the inner core assembly comprises a core member and a wire guide tube cavity formed in the core member; an anti-jump device is formed on the core member; one end of the anti-jump device is bent towards the center direction deviating from the core member so as to form a bending end for fixing the stent; a hydraulic system comprises a first infusion channel and a second infusion channel formed in the core member; a membrane outer sheath is arranged on the outer side of the hydraulic system and the inner core assembly in a sleeving manner; a one-way limiting structure is formed in the inner surface of the membrane outer sheath so as to guarantee that the membrane outer sheath is in limited sliding contact with the outer surface of a hydraulic tube. According to the delivery system for the expandable stent provided by the invention, due to repeated operations of the hydraulic system, the membrane outer sheath retracts, and in the membrane outer sheath retracting process, the stent can be slowly released during automatic expansion by the anti-jump device and forward jump of the stent after restraint removal can be effectively prevented; therefore, the release position is accurate.

Description

technical field [0001] The present invention relates to the technical field of stent delivery devices, in particular to a delivery system for expandable stents. Background technique [0002] Interventional therapy is an emerging discipline that has developed rapidly in recent years and integrates imaging diagnosis and clinical treatment. Under the guidance and monitoring of imaging equipment such as digital subtraction angiography, CT, ultrasound, and magnetic resonance, it uses puncture needles, catheters, and other interventional equipment to introduce specific instruments into human lesions through natural orifices or tiny wounds. A general term for a series of techniques for minimally invasive treatment of a site. At present, it has become the three pillar clinical disciplines alongside traditional internal medicine and surgery. [0003] Now, interventional therapy is often used in the treatment of human vascular stents. The stents used in human blood vessels are loade...

AI Technical Summary

Problems solved by technology

[0004] Therefore, when the existing stent delivery device releases the stent, the bouncing of the stent makes the positioning of the stent inaccurate in the lesion, which makes it more difficult to accurately support the stent in the stenosis of the lesion, and urgently needs improvement.

Images