Ablation catheter with selectively deployable electrodes
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United States of America Patent
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Jun 30, 1992
Issued Date -
N/A
app pub date -
Feb 19, 1991
filing date -
Apr 13, 1989
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A RF ablation catheter for removing athero-stenotic lesions or modifying the tissue characteristics of the interior walls of selected blood vessels is described. The catheter is characterized in having a tip member which during the initial placement of the catheter within the vascular system so that the distal tip member is disposed in a working relation with the lesion to be removed, means are provided for increasing the cross-sectional profile of the tip members to thereby cause it to move into engagement with the lesion to be excised. The application of an RF voltage across a pair of bipolar electrodes is used to create an electric arc for effecting the cutting action, or alternatively, just sufficient RF energy to sear or otherwise alter the tissue surfaces engaged by the distal tip member.
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