Side-Firing Fiber Device for Underwater Tissue Ablation with Ho:YAG and Er:YAG Laser Radiation.

A side-firing fiber device for arthroscopic Ho:YAG (λ=2.12 μm) and Er:YAG (λ=2.94 μm) laser applications was designed and constructed. The fiber delivery instrument consisted of a zirconium fluoride (ZrF4) fiber equipped with a coaxially mounted short end-piece of low OH- quartz fiber polished at an angle of 30 deg. The dynamics and depth of the vapor channel in water and the amplitude of pressure transients associated with the collapse of the vapor channel were measured for pulse energies up to 1 J (Ho:YAG) and 200 mJ for the Er:YAG laser (pulse duration τ=400 μs), respectively. To assess the feasibility of the side-firing fiber delivery instrument, the ablation efficiency and laser-induced damage in poly(acylamide) and meniscal tissue were determined after Ho:YAG and Er:YAG laser ablation. © 1998 Society of Photo-Optical Instrumentation Engineers.

[1]  Ulrich Parlitz,et al.  Minimization of cavitation effects in pulsed laser ablation illustrated on laser angioplasty , 1996 .

[2]  J. Krauss,et al.  Lasers in ophthalmology , 1996, Lasers in surgery and medicine.

[3]  Martin Frenz,et al.  Side-firing fiber for underwater tissue ablation with erbium laser radiation , 1996, Photonics West.

[4]  E. Dreher,et al.  Effects of various laser types and beam transmission methods on female organ tissue in the pig: An in vitro study , 1994, Lasers in surgery and medicine.

[5]  Norman S. Nishioka,et al.  Pulsed holmium laser tissue ablation threshold studies , 1992, Photonics West - Lasers and Applications in Science and Engineering.

[6]  Martin Frenz,et al.  Starting mechanisms of bubble formation induced by Ho:Tm:YAG laser in water , 1996, European Conference on Biomedical Optics.

[7]  Martin Frenz,et al.  Combination of erbium and holmium laser radiation for tissue ablation , 1996, Photonics West.

[8]  James A. Harrington.  Laser power delivery in infrared fiber optics (Invited Paper) , 1992, Photonics West - Lasers and Applications in Science and Engineering.

[9]  Martin Frenz,et al.  Dynamics of laser-induced channel formation in water and influence of pulse duration on the ablation of biotissue under water with pulsed erbium-laser radiation , 1994 .

[10]  J. Curcio,et al.  Near infrared absorption spectrum of liquid water , 1951 .

[11]  Thomas Jansen,et al.  Holmium laser ablation of cartilage: effects of cavitation bubbles , 1995, Photonics West.

[12]  Martin Frenz,et al.  Acoustic transient generation in pulsed holmium laser ablation under water , 1994, SPIE LASE.

[13]  Martin Frenz,et al.  Infrared multiwavelength laser system for establishing a surgical delivery path through water , 1995 .

[14]  I. Gannot,et al.  Flexible waveguides for Er-YAG laser radiation delivery , 1995, IEEE Transactions on Biomedical Engineering.

[15]  T G van Leeuwen,et al.  Noncontact tissue ablation by Holmium: YSGG laser pulses in blood , 1991, Lasers in surgery and medicine.

[16]  H P Weber,et al.  Temperature and pressure effects during erbium laser stapedotomy , 1996, Lasers in surgery and medicine.

[17]  T G van Leeuwen,et al.  Intraluminal Vapor Bubble Induced by Excimer Laser Pulse Causes Microsecond Arterial Dilation and Invagination Leading to Extensive Wall Damage in the Rabbit , 1993, Circulation.

[18]  W S Grundfest,et al.  Excimer laser ablation of fibrocartilage: An in vitro and in vivo study , 1991, Lasers in surgery and medicine.

[19]  Martin Frenz,et al.  Comparison of the effects of absorption coefficient and pulse duration of 2.12-/spl mu/m and 2.79-/spl mu/m radiation on laser ablation of tissue , 1996 .

[20]  H P Weber,et al.  Combination of fiber-guided pulsed erbium and holmium laser radiation for tissue ablation under water. , 1996, Applied optics.

[21]  Martin Frenz,et al.  Transient photoacoustic effects induced in liquids by pulsed erbium lasers , 1994, SPIE LASE.

[22]  Claus-Dieter Ohl,et al.  Cavitation bubble collapse studied at 20 million frames per second , 1995 .

[23]  Werner Lauterborn,et al.  Acoustic transient generation by laser‐produced cavitation bubbles near solid boundaries , 1988 .

[24]  T J Flotte,et al.  Co:MgF2 laser ablation of tissue: Effect of wavelength on ablation threshold and thermal damage , 1991, Lasers in surgery and medicine.

[25]  V. Romano,et al.  Fibre-end micro-lens system for endoscopic erbium-laser surgery applications , 1994 .

[26]  A. Welch,et al.  Pulsed holmium laser ablation of tissue phantoms: correlation between bubble formation and acoustic transients , 1997 .

[27]  A J Welch,et al.  Effect of pulse duration on bubble formation and laser‐induced pressure waves during holmium laser ablation , 1996, Lasers in surgery and medicine.

[28]  B. A. Mikhailov,et al.  Dispersion and Absorption of Liquid Water in the Infrared and Radio Regions of the Spectrum , 1969 .

[29]  P. Schenk,et al.  Holmium: YAG Infrarot Laser- und UV-Excimer. Laser-Effekte auf orale Schleimhautgewebe , 1992 .

[30]  Robert Hickling,et al.  Collapse and rebound of a spherical bubble in water , 1964 .

[31]  T G van Leeuwen,et al.  Origin of arterial wall dissections induced by pulsed excimer and mid-infrared laser ablation in the pig. , 1992, Journal of the American College of Cardiology.