A - Human Necessities – 61 – M
Patent
A - Human Necessities
61
M
A61M 25/00 (2006.01)
Patent
CA 2330613
A flow directed microcatheter (10) is formed having a gradually changing flexibility and diameter between a proximal end (A) and a distal end (B) of the microcatheter (10). The changing properties of the microcatheter (10) according to the present invention provide the flexibility of the distal tip (44) needed to allow the microcatheter (10) to be directed by the flow of blood within the vasculature, the columnar strength and torquability at the proximal end (A) and along the length of the microcatheter (10) needed to advance, and direct the distal tip to the target site. A proximal segment (A) of the microcatheter (10) includes a plurality of strands which vary in diameter to change the flexibility of the microcatheter (10). A distal segment (B) of the microcatheter (10) includes an inner layer (46) which is compatible with solvents, such as DMSO, and an outer layer (48) which provides strength and flexibility. The proximal segment (A), and the distal segment (B) of the microcatheter (10) are joined by a kink resistant fuse joint (12).
Un microcathéter (10) dirigé par le flux sanguin est formé de sorte que sa flexibilité et son diamètre varient graduellement entre une extrémité proximale (A) et une extrémité distale (B) du microcathéter (10). Les propriétés variables du microcathéter (10) de cette invention confèrent à l'embout distal (44) la flexibilité nécessaire pour que le microcathéter (10) soit dirigé par le flux sanguin dans le système vasculaire, la résistance de la colonne et la capacité de transmission du couple à l'extrémité proximale (A) et sur la longueur du microcathéter (10) nécessaires pour faire avancer et pour diriger l'embout distal vers le site cible. Un segment proximal (A) du microcathéter (10) comprend plusieurs torons dont le diamètre varie pour modifier la flexibilité du microcathéter (10). Un segment distal (B) du microcathéter comporte une couche interne (46) qui est compatible avec des solvants tels que le diméthylsulfoxyde, et une couche externe (48) qui confère la résistance et la flexibilité. Le segment proximal (A) et le segment distal (B) du microcathéter (10) sont réunis au moyen d'un joint (12) thermosoudé résistant aux coudes.
Micro Therapeutics Inc.
Torys Llp
LandOfFree
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