Medical instrument working end creating very high pressure gradients
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United States of America Patent
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Jan 21, 2003
Grant Date -
Nov 1, 2001
app pub date -
Feb 12, 2001
filing date -
Mar 27, 1998
priority date (Note) -
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Abstract
A micro-catheter system utilizing a microjoule pulsed electrical discharge between first and second electrodes in a recessed lumen at the catheter working end for creating a cavitating volume of electrolytic fluid composition including a pharmacologic agent. The expansion and collapse of media at a high repetition rate creates acoustic waves that propagate distally from the working end of the micro-catheter to disrupt thrombus. The expansion and collapse of such cavitation bubbles 'jet' the pharmacologic agent at a controlled velocity into the acoustically-disrupted thrombus to further depolymerize the thrombus. The catheter system includes a computer-controller for independent modulation of (i) all aspects of pharmacologic agent delivery, and (ii) all parameters of electrical discharge to 'tailor' the combined acoustic wave effects and pharmacologic agent effects to dissolve thrombus rapidly and efficiently.
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