초록 ▼

Pathological tissue is excised with a beam from a laser that is coupled through a flexible, optical wave guide to a collimator that reduces the beam cross sectional area by variable, controlled amounts. A transparent bore or a graphite cannula couples the beam exiting the collimator to the tissue to

Pathological tissue is excised with a beam from a laser that is coupled through a flexible, optical wave guide to a collimator that reduces the beam cross sectional area by variable, controlled amounts. A transparent bore or a graphite cannula 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.

대표청구항 ▼

An instrument for excising pathological tissue from a living animal organism comprising means for emitting a beam of coherent optical radiation, collimating means responsive to the beam for reducing the beam cross sectional area, a pyrolytic graphite cannula having an optically transparent interior

An instrument for excising pathological tissue from a living animal organism comprising means for emitting a beam of coherent optical radiation, collimating means responsive to the beam for reducing the beam cross sectional area, a pyrolytic graphite cannula having an optically transparent interior responsive to the reduced diameter beam, said cannula coupling the reduced diameter beam onto the tissue so the tissue is irradiated by the beam, said reduced diameter beam having sufficient energy to vaporize the irradiated tissue, the graphite of the cannula having a crystalline structure orieinted whereby heating of the cannula interior by radiation from the beam is not substantially transferred by conduction to the exterior of the cannula.