On the characteristics of micro-fluid jets generated by Ho:YAG pulsed laser focusing

M. Viren, T. Hashimoto, T. Ohki, M. Sun, K. Takayama, A. Nakagawa, G. Jagadeesh

Research output: Contribution to conferencePaperpeer-review


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.

Original languageEnglish
Number of pages6
Publication statusPublished - 2004
Event42nd AIAA Aerospace Sciences Meeting and Exhibit - Reno, NV, United States
Duration: 2004 Jan 52004 Jan 8


Conference42nd AIAA Aerospace Sciences Meeting and Exhibit
Country/TerritoryUnited States
CityReno, NV


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