Medical instruments and techniques for highly-localized thermally-mediated therapies
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United States of America Patent
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Dec 30, 2003
Grant Date -
Jun 27, 2002
app pub date -
Dec 7, 2001
filing date -
Sep 5, 2000
priority date (Note) -
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Abstract
This invention relates a novel surgical device scalable to small dimensions for thermally-mediated treatments or thermoplasties of targeted tissue volumes. An exemplary embodiment is adapted for shrinking, sealing or welding tissue. The instruments and techniques utilize a thermal energy delivery means, for example an electrical energy source, to instantly vaporize a biocompatible fluid media within an electrically insulated instrument body. The altered media is characterized by a (i) a high heat content, and (ii) a high exit velocity from the working end both of which characteristics are controlled to hydrate tissue and at the same time denature proteins to shrink, seal, weld or cause any other thermally-mediated treatment of an engaged tissue volume--while causing limited collateral thermal damage and while totally eliminating electrical current flow the engaged tissue volume. The system can further utilize a piezoelectric material that carries fluid channels to apply compressive forces to eject the gas media from the working end of allow a lesser electrical energy requirement to convert a liquid to a gas and to increase media exit pressure.
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