Development of Er-YAG laser for laser angioplasty

本文报道了Er-YAG激光器及其传输系统的研制结果。Er-YAG激光器的波长为2.94 μ m，水对激光束的吸收率高于其它激光束。预期Er-YAG激光束对生物组织有不同的作用。Er-YAG激光器具有重复脉冲振荡，脉冲宽度为240 μ s，重复频率为5 ~ 10脉冲/秒。激光器的平均功率为4 W，最大功率为10 ps，光纤采用锆F玻璃，我们对Er-YAG激光在离体兔动脉、心肌和人动脉上的应用进行了研究。在组织学检查中观察到非常清晰的切口。没有热损伤的迹象，锋利的表面上没有碳化。实验结果表明，Er-YAG激光在血管成形激光方面具有良好的应用前景。

Result of developments of Er-YAG laser and its delivery system were reported. Er-YAG laser's wavelength is 2.94 mu m, the beam absorption rate by water is higher than other laser beam. Er-YAG laser beam is expected different effect for a biotissue. Er-YAG laser has repeated pulse oscillation, pulse width is 240 mu, sec, the repeat frequency is between 5 to 10 pulse per second. The mean power is 4w maximum, 10pps.The fiber's of laser are made of zirconium-F-glass.We carried out a study on the possible application of the Er-YAG laser on the rabbit arteries and myocardium and human arteries were examined in vitro. Very clear cuts were observed on the histological examination. There were no evidence of thermal damage, no carbonization on the sharp catting surface. Experimental result showed that Er-YAG lasers had good potential for angioplastic laser.