| 摘要 |
A cryosurgical instrument which may be used with interchangeable spray and closed end cryotips includes a body member with a central bore extending partially therethrough. Refrigerant is supplied to a first point in the bore through a valved refrigerant supply line while an effluent opening connects an effluent line to a second point in the bore. The bore receives the inner ends of cryotips. All cryotips used with the instrument include refrigerant delivery tubes having inner ends which are positioned adjacent the first point in the bore and O-rings which are seated between the first point and the second point in the bore to prevent escape of refrigerant. Closed end cryotips to be used with the instrument further include an effluent channel extending from an expansion chamber to the second point in the bore. A second O-ring is provided with closed end cryotips. The second O-ring is seated between the second point in the bore and its open end to prevent escape of effluent refrigerant flowing through the effluent channel.
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