A guidewire with a variable stiffness distal portion

A - Human Necessities – 61 – M

Patent

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Details

A61M 25/09 (2006.01) A61M 25/01 (2006.01)

Patent

CA 2251748

A guidewire having a core section formed of a NiTi alloy which is in an austenite phase when being manufactured but which is converted to the martensite phase at operating (body) temperature (37 ~C) and can be transformed to an austenite phase by heating to a temperature above body temperature but below 50 ~C. When in the austenite phase, the core section is at a high strength level which ensures the tracking of a catheter over the guidewire within a patient's body lumen. In one preferred embodiment the core section is heated by electrical resistance or inductance.

L'invention concerne un fil de guidage comportant une section centrale formée dans un alliage de NiTi qui est fabriqué dans une phase austénite, mais qui est ensuite convertie en phase martensite à la température du corps (37 ·C) et qui peut être transformée en phase austénite à une température égale ou supérieure à la température du corps, à condition qu'elle ne dépasse pas 50 ·C. Lorsqu'elle est en phase austénite, la section centrale a une résistance élevée, ce qui permet de faire avancer un cathéter sur le fil de guidage dans un lumen corporel d'un patient. Selon une réalisation préférée, la section centrale est chauffée par une résistance électrique ou un dispositif d'induction.

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