Expandable laser catheter

Details Expandable laser catheter Expandable laser catheter

A - Human Necessities

61

B

A61B 18/24 (2006.01) A61M 25/10 (2006.01)

Patent

CA 2340195

Expandable laser catheters (10) for utilizing laser energy to remove obstructions (36) from body passages (34) are described. In one embodiment, the laser catheter includes a shaftway (12) having a distal end (18) including a flexible portion (20) configured in a series of radial folds. Multiple optical fibers (30), configured to transmit laser energy, extend along the shaftway and are attached to the flexible portion. An inflatable, ring-shaped balloon (22) is attached to the catheter (10) within the flexible portion (20). In use, the catheter (10) is inserted into a body passage (34) such as an artery, and advanced until the distal end (18) is adjacent to an obstruction. The balloon (22) is inflated to expand the flexible portion (20) and to bring the optical fibers (30) nearer the inner wall of the body passage. Laser energy is directed by the optical fibers (30) toward targeted regions of the obstruction (36). As the catheter is advanced and the process repeated, a core (50) is formed from the obstruction (36) and contained within the flexible portion (20). The flexible portion (20) is then contracted to hold the core (50), and the core (50) is removed from the body passage (34) by withdrawing the catheter (10).

L'invention concerne des cathéters laser dilatables (10) utilisant de l'énergie laser pour enlever des obstructions (36) des conduits corporels (34). Dans un mode de réalisation, le cathéter laser comprend un tuyau (12) ayant une extrémité distale (18) possédant une partie flexible (20) pourvue d'une série de plis radiaux. Les multiples fibres optiques (30), destinées à transmettre l'énergie laser, s'étendent le long du tuyau et sont attachées à la partie flexible. Un ballonnet gonflable annulaire (22) est attaché au cathéter (10) à l'intérieur de la partie flexible (20). Lors de l'utilisation, on insère le cathéter (10) dans un conduit corporel (34) tel qu'une artère et on l'avance jusqu'à ce que l'extrémité distale (18) soit adjacente à une obstruction. On gonfle le ballonnet (22) de manière à dilater la partie flexible (20) et à rapprocher les fibres optiques (30) de la paroi intérieure du conduit corporel. On dirige l'énergie laser, par le biais de fibres optiques (30), vers des régions ciblées de l'obstruction (36). Tandis que l'on avance le cathéter et que l'on répète la manipulation, un noyau (50) prélevé sur l'obstruction (36) se forme et est retenu à l'intérieur de la partie flexible (20). On contracte ensuite la partie flexible (20) pour maintenir le noyau (50), que l'on enlève du conduit en retirant le cathéter (10).

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