| 摘要 |
An improved defrostable cryosurgical instrument has a unitary in-line valve assembly that permits the assembly to be contained right in the instrument itself without making the instrument unduly large, heavy or upsetting its balance. By a fingertip control right in the instrument itself, the valve assembly can be controlled to route refrigerant through the instrument's tip to operate the instrument in a freeze mode, a defrost mode and to turn the instrument off, while simultaneously depressurizing the tip. |
