Expandable sheath and its connecting assembly

By combining pressure-holding and fixing components, a stable connection between the expandable stent and the sheath is achieved, solving the adaptability and sealing problems of traditional catheter sheaths, and improving surgical safety and patient experience.

CN224523778UActive Publication Date: 2026-07-21SHANGHAI PHIGINE MEDICAL CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
SHANGHAI PHIGINE MEDICAL CO LTD
Filing Date
2025-08-15
Publication Date
2026-07-21

AI Technical Summary

Technical Problem

The fixed diameter design of traditional catheter sheaths cannot flexibly adapt to individual differences in human cavities, resulting in a high risk of vascular injury, long operation time, and strong patient discomfort. In addition, nickel-titanium alloy stents with elastic membranes have dynamic-static sealing problems.

Method used

The design employs a combination of pressure-holding and fixing components, and achieves a stable connection between the expandable stent and the sheath through a limiting groove and a conical structure, providing controllable positive pressure and preventing backflow of blood or perfusion fluid.

Benefits of technology

It improves surgical safety, reduces the risk of vascular injury, simplifies the surgical procedure, enhances the patient experience, and solves the dynamic-static sealing problem.

✦ Generated by Eureka AI based on patent content.

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Abstract

An expandable sheath and its connecting assembly are disclosed. The connecting assembly connects the sheath and an expandable stent, including a pressure-holding member and a fixing member located at the distal end of the pressure-holding member. A limiting groove is formed on the outer wall of the distal end of the pressure-holding member, suitable for accommodating the proximal end of the expandable stent and restricting its circumferential movement. The fixing member is sleeved outside the distal end of the pressure-holding member and is adapted to cooperate with the limiting groove to restrict the radial movement of the proximal end of the expandable stent. This application, by providing the limiting groove and the fixing member, effectively restricts the relative movement between the proximal end of the expandable stent and the sheath, achieving a stable connection between the two. Simultaneously, the fixing member, cooperating with the limiting groove, presses the proximal end of the expandable stent into the limiting groove, facilitating tight contact between the proximal end of the expandable stent and the connecting assembly, improving the sealing effect. When the expandable stent dynamically expands and contracts, the pressure-holding member can continuously output controllable positive pressure, preventing backflow of blood or perfusion fluid and improving surgical safety.
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