Apparatus for and method of utilizing energy to excise pathological tissue
Patent 4469098 Issued on September 4, 1984. Estimated Expiration Date: 
September 4, 2001. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
September 4, 2001. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesInventorApplicationNo. 06/260808 filed on 05/05/1981US Classes:606/7, Angioplasty219/121.75, With lens219/121.8, Swept or scanned606/17, With beam shaping or redirecting (e.g., lens)607/89Laser applicationExaminersPrimary: Cohen, Lee S.Attorney, Agent or FirmInternational ClassesA61B 18/20 (20060101)B23K 26/06 (20060101) B23K 26/10 (20060101) A61B 17/00 (20060101) AbstractPathological tissue is excised with a beam from a laser that is coupled through a flexible, optical waveguide to a collimator that reduces the beam cross-sectional area by variable, controlled amounts. A transparent bore or a graphite cannule couples the beam exiting the collimator to the tissue to vaporize same. An electrically responsive deflector gyrates the reduced cross-sectional area beam about a bore sight axis aligned with the cannula bore so that the excised tissue has a frusto-conical volume. To excise different, displaced tissue regions, a position servo system moves the cannula so the bore sight axis moves in a plane at right angles to a plane on the exterior surface containing the pathological tissue.Other References
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