Expansion-assisting delivery system for self-expanding stent

Details Expansion-assisting delivery system for self-expanding stent Expansion-assisting delivery system for self-expanding stent

A - Human Necessities

61

F

A61F 2/06 (2006.01)

Patent

CA 2433389

A delivery system for a self-expanding stent includes a catheter having a distal end and being configured to retain a self-expanding stent proximate the distal end. The delivery system also includes an inflatable device provided on the catheter and positioned proximate the distal end. The inflatable device, typically a balloon, is configured to selectively assist the self-expanding stent with radially expansion. The catheter includes a tubular member and an outer member coaxially positioned about the tubular member. The outer member can slide relative to the tubular member in an axial direction. The outer member is configured to retain a self-expanding stent in a radially-compressed position and to release the self-expanding stent to a radially-expanded position. The delivery system may also include a holding sleeve provided on the tubular member, spaced from the distal end of the catheter, and configured to hold the self-expanding stent. The delivery system preferably includes a loading funnel configured to be removably attachable to the distal end of the tubular member and configured to assist with radial compression of the self- expanding stent and advancement of the self-expanding stent within the outer member.

L'invention concerne un système de distribution pour stent auto-déployable comprenant un cathéter doté d'une extrémité distale et configuré de façon à maintenir le stent auto-déployable à proximité de ladite extrémité distale, et un dispositif gonflable placé sur ledit cathéter et positionné à proximité de cette extrémité distale. Le dispositif gonflable est généralement un ballonnet configuré de façon à favoriser sélectivement le déploiement radial du stent auto-déployable. Le cathéter comprend un élément tubulaire et un élément extérieur placé coaxialement autour dudit élément tubulaire. Ledit élément extérieur peut coulisser par rapport à l'élément tubulaire dans un sens axial, et est configuré de façon à maintenir le stent auto-déployable dans une position radialement comprimée et à le libérer vers une position radialement étendue. Le système de distribution peut également comprendre un manchon de support placé sur l'élément tubulaire, espacé de l'extrémité distale du cathéter, et est configuré de façon à supporter le stent auto-déployable. Il comprend enfin, de préférence, un entonnoir de chargement configuré de façon à être fixé amovible à l'extrémité distale de l'élément tubulaire, et est configuré de façon à favoriser la compression du stent auto-déployable et à le faire avancer dans l'élément extérieur.

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