Catheter placement by pressurizable tubular guiding core
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United States of America Patent
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Mar 12, 1996
Grant Date -
N/A
app pub date -
Apr 17, 1995
filing date -
Apr 17, 1995
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A catheter is provided with steering capability at its distal end by a tubular guiding member which protrudes from an opening at the distal end of the catheter and either changes shape or rotates about its longitudinal axis upon pressurization from the proximal end. In one means of actuation, the tubular member has one or more ports close to its distal end, which form laterally directed jets when the tubular member is pressurized within by fluid, the reaction force of the jets bending the tubular member in the desired direction or causing it to rotate. In another means of actuation, the tubular member either curves upon pressurization from an otherwise straight configuration upon pressurization, or straightens from an otherwise curved configuration. The tubular member can expand upon pressurization to seize the interior of the catheter body, rending both elements movable as a unit. Once the catheter is fully positioned, the tubular member can be withdrawn and replaced by functional devices or guidewires.
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