An instrument for surgically removing a solid cone of tissue. An inner cylinder is rotatably fitted within an outer cylinder. Mirrors are mounted inside the inner cylinder and positioned such that a narrowly converging laser beam, traveling down the cylindrical axis, is deviated to exit the instrument in a direction which intersects the cylindrical axis at an acute angle. By rotating the inner cylinder with its mirrors, the exiting laser beam is caused to sweep out a conical surface. In cervical conization, the instrument is inserted so that its distal end is adjacent the cervix and the beam is incident thereon to excise a cone-shaped sample. In one embodiment, an axial guide pin protrudes from the distal end for insertion through the cervical os.
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