Medical probe with stylets

Surgery – Means for introducing or removing material from body for... – With means for cutting – scarifying – or vibrating tissue

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A61B 1739

Patent

active

055911250

ABSTRACT:
A medical probe device of this invention comprising a catheter having a control end and a probe end. The probe end includes a stylet guide housing having at least one stylet port and stylet guide means for directing a flexible stylet outward through at least one stylet port and through intervening tissue to targeted tissues. A stylet is positioned in at least one of said stylet guide means, the stylet comprising a non-conductive sleeve having a RF electrode lumen and an optional a fluid supply lumen and a temperature sensor lumen therein. At least one portion of an opposed surface of the electrode lumen and the electrode can be spaced apart to define a liquid supply passageway for delivery of medicament liquid. The RF electrode enclosed within the non-conductive sleeve has a distal length optionally having at least one current focusing groove means thereon and a distal tip shaped to focus current crowding on its terminal end, whereby Rf current passing therefrom into surrounding tissue forms a lesion extending outward from the groove and tip. The focusing groove means can be a plurality of annular focusing grooves or a spiral focusing groove thereon.

REFERENCES:
patent: 4950267 (1990-08-01), Ishihara et al.
patent: 5003991 (1991-04-01), Takayama et al.
patent: 5421819 (1995-06-01), Edwards et al.
U.S. Patent application 07/832,115 Filed on Feb. 2, 1992.

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