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首页> 外文会议>Conference on laser in surgery: Advanced characterization, therapeutics, and systems >Dynamic Cooling during Laser Skin Welding
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Dynamic Cooling during Laser Skin Welding

机译：激光皮肤焊接期间的动态冷却

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Cryogen spray cooling of the tissue surface was investigated for laser welding applications. Benefits include reduced thermal damage to the papillary dermis and reduced operation time. Two-cm-long, full-thickness incisions were made on the backs of guinea pigs, in vivo. India ink was used as an absorber and clamps were used to appose the incision edges. Continuous-wave, 1.06-μm, Nd:YAG laser radiation was scanned over the incisions, producing ～100 ms pulses. A 4-mm-diameter laser spot was used with a constant power of 16 W. The total operation time was 60 or 120 s. Cryogen was delivered in spurt durations of 20, 60, or 100 ms, with 2 or 4 s between spurts. The working distance was ～12 cm, and the spray covered an area of about 5.0 * 5.0 cm. Control welds (without cooling) were irradiated for 20, 40, or 60 s. Total operation times were reduced from 10 min without dynamic cooling to 1 min with dynamic cooling. Optimal tensile strength was 1.7 ± 0.4 kg/cm~2, comparable to strengths of 2.1 ± 0.7 kg/cm~2 reported in previous studies without cryogen cooling (p > 0.25). Thermal damage in the papillary dermis measured 320 ± 80 μm.
机译：针对激光焊接应用研究了组织表面的冷冻剂喷射冷却。益处包括减少乳头皮真皮的热损伤和减少操作时间。在豚鼠的背面，在体内制作了两厘米长的全厚切口。印度墨水用作吸收器，夹具用于寻呼切口边缘。连续波，1.06-μm，ND：在切口上扫描了YAG激光辐射，产生〜100 ms脉冲。使用4毫米直径的激光斑点，恒定功率为16W。总操作时间为60或120秒。冷冻原在20,60或100ms的涡翅膀上递送，在喷射之间有2或4秒。工作距离为约12厘米，喷雾覆盖约5.0 * 5.0厘米的面积。控制焊接（不冷却）20,40或60秒。总操作时间从10分钟降低，没有动态冷却至1分钟，动态冷却。最佳拉伸强度为1.7±0.4 kg / cm〜2，与之前的研究中报告的2.1±0.7kg / cm〜2的强度相当，没有冷冻剂冷却（p> 0.25）。乳头状真皮中的热损伤测量320±80μm。

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