I claim the ornamental design for a cryosurgical instrument, as shown and described.
FIG. 1 is a perspective view of the cryosurgical instrument, with a
rotatable valve operating lever in a first position.
FIG. 2 is a side elevation view of the cryosurgical instrument of FIG. 1
with the valve operating lever in a second position.
FIG. 3 is a front elevation view of the cryosurgical instrument of FIG. 1
with the valve operation lever shown solid in the second position and in
phantom in a third and fourth position.
FIG. 4 is a top plan view of the cryosurgical instrument of FIG. 1 with the
valve operating lever in the second position; and,
FIG. 5 is an bottom plan viewof the cryosurgical instrument of FIG. 1 with
the valve operating lever in the second position.