Vascular prosthesis assembly with retention mechanism and method

Abstract

A vascular prosthesis assembly includes a self expanding prosthesis and a selectively releasable retention mechanism over the outer surface of the prosthesis which maintains the vascular prosthesis in a contracted state. The retention mechanism may include a removable strand extending along the length of the prosthesis having a series of slip knots. The retention mechanism may also include a removable strand which engages overlying layers of a wrapped prosthesis by the passage of the strand through openings in the overlying layers. Manipulation of a user-accessible release strand permits release of the retention mechanism. The retention mechanism may also include a generally cylindrical sheath housing the vascular prosthesis, the sheath constructed to be split and removed to release the prosthesis. A method releases the prosthesis to expand at a target site using a retention mechanism.

Description

technical field [0001] The invention relates to a blood vessel prosthesis assembly comprising a fixing frame and a method thereof. Background technique [0002] Vascular prostheses are now on the market for the treatment of aneurysms, stenosis, and other vascular diseases with a wide range of applications. Stents, stent-grafts, and other vascular prostheses are known to treat a myriad of vascular diseases. For percutaneous interventions, a number of vascular prostheses are inserted into the human urinary catheter and deployed precisely and safely at the intended treatment site. [0003] Known self-expanding vascular prostheses are maintained in transit within the catheter using an outer sheath; the prosthesis expands automatically when the sheath is retracted. See, for example, US Patent Application US2008 / 0021657A1 of the assignee of the present invention. Due to this state, some possible adverse effects occur during the deployment of the prosthesis. Since the sheath co...

AI Technical Summary

Problems solved by technology

These conditions can cause the materials used in the device to swell and weaken, which allows the vascular prosthesis to expand radially and become embedded in the sheath, causing high deployment forces and potentially increased profile

In addition, prosthetic materials have such material properties that elevated temperatures lead to large outward forces on the outer sheath of the vascular prosthesis, which may further result in high deployment forces

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