Dilation catheter with a smooth transition between a stiff proximal portion and a flexible distal portion
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United States of America Patent
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-
Jan 2, 1996
Grant Date -
N/A
app pub date -
May 27, 1994
filing date -
May 27, 1994
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A balloon dilatation having a catheter shaft with inner and outer tubular members with the proximal portion of the inner tubular member being formed of a pseudoelastic NiTi alloy having an A.sub.f at or below body temperature. The austenite phase is stable at body temperature exhibits a stress induced transformation, to the martensite phase which has a much lower modulus of elasticity than the austenite phase. The distal portion of the inner tubular member is formed of a flexible plastic material. The junction of the proximal and distal portions of the inner tubular member is preferably supported by a transition sleeve formed of a high strength plastic such as polyimide to provide a smoother transition between the proxima and distal portions of the inner tubular member and in turn the proximal and distal portion of the catheter shaft.
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