| 摘要 |
<p>A sheath (20) for use on a closed loop Joule-Thomson cryosurgical probe (10), and the combination of the sheath (20) and the closed loop probe (10). The sheath (20) is slipped over the probe (10), thereby separating the probe from the environment. The sheath (20) has a grip (22) which fits over the handle (12) of the cryosurgical probe, and an extendible shroud (23) which can be longitudinally extended to cover tubing (18) and which are attached to the handle (12). The sheath (20) has a hollow multi-lumen catheter (24) shaped and sized to fit snugly over the cannula (14) of the cryosurgical probe (10). The catheter (24) is not thermally conductive, preventing transfer of heat from the ambient to the gas mixture, and preventing the freezing of tissues at undesired locations along the catheter. A thermally conductive cap or tip (26) is biased against the cold tip (16) on the probe (10) by a biasing element (28) in the sheath assembly.</p> |
