A micro-water jet device that can be used for precise dissection of soft tissue in surgical procedures has been developed. The water jet is generated by irradiating a pulsed Ho:YAG laser, through an optical fiber, into a thin tube/catheter filled with water or a physiological saline solution. A micro-metallic nozzle of 100-200μm exit diameter has been connected to the end of the tube. Pulse laser irradiation within the tube evaporates water generating a vapor bubble, whose rapid expansion drives a micro-water jet through the tube exit. This laser induced micro-water jet can readily penetrate into soft tissue. The jet is applicable to neuroendoscopic surgery, treatment of cerebral thrombosis, intravascular drug delivery etc. The Ho:YAG laser has wavelength and pulse duration of 2.1μm and 350μs respectively. The laser energy is variable from 250 to 800mJ/pulse. The thermal effect and controllability of the jet were first investigated on a 10% gelatin layer which simulates soft tissue, and then the jet was used to dissect the ventricular wall of a cadaver rabbit. The result indicatea that the incision was well controlled, preserving capillary blood vessels thicker than 0.2 mm in diameter, and the collateral damage to the tissue was negligible.
|Number of pages||6|
|Publication status||Published - 2004|
|Event||42nd AIAA Aerospace Sciences Meeting and Exhibit - Reno, NV, United States|
Duration: 2004 Jan 5 → 2004 Jan 8
|Conference||42nd AIAA Aerospace Sciences Meeting and Exhibit|
|Period||04/1/5 → 04/1/8|