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Endoscopic surgical instrument

  • US 5,562,703 A
  • Filed: 06/14/1994
  • Issued: 10/08/1996
  • Est. Priority Date: 06/14/1994
  • Status: Expired due to Fees
First Claim
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1. An endoscopic surgical instrument comprising:

  • a) housing;

    b) a single access conduit being disposed within said housing, and having a proximal end and a distal end;

    c) an irrigation port formed in said housing;

    d) an evacuation port formed in said housing, each of said irrigation and said evacuation ports being in fluid communication, through independent valves, with said proximal end of said single access conduit;

    e) an aperture and a closure therefor, said aperture being formed in said housing, and said closure being openable to allow the ingress of microsurgical instrumentation into said proximal end of said single access conduit; and

    f) RF electrode means insertable into said aperture and into said single access conduit and having a length so as to protrude beyond said distal end of said single access conduit, said RF electrode means for engaging a body tissue portion, and for simultaneously ablating said body tissue portion and measuring an impedance value associated with said body tissue portion, said RF electrode means includingi) a first RF electrode having a distal end and a proximal end, said first RF electrode being disposed within an insulating sheath;

    ii) elongated guide means encasing said first RF electrode and said insulating sheath, for guiding said first RF electrode to a predetermined angle value from the longitudinal axis of said single access conduit;

    iii) electrode movement mechanism means, attached to said proximal end of said first RF electrode, for moving said first RF electrode within said guide means, said distal end of said first RF electrode is extendable beyond an open end of said guide means up to a predetermined length value and engagable with and insertable into said body tissue portion;

    iv) energy source means, in electrical communication with said proximal end of said first RF electrode, for transmitting energy into said distal end of said first RF electrode when it is extended beyond said guide means and into said body tissue portion to ablate said body tissue portion; and

    v) tissue impedance measurement means, in electrical communication with said proximal end of said first RF electrode, for measuring an impedance associated with said body tissue portion engaged with said distal end of said first RF electrode when it is extended beyond said guide means.

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