Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
COMBINATION OF FIBER-GUIDED PULSED ERBIUM AND HOLMIUM LASER-RADIATIONFOR TISSUE ABLATION UNDER WATER
Autore:
PRATISTO H; FRENZ M; ITH M; ALTERMATT HJ; JANSEN ED; WEBER HP;
Indirizzi:
UNIV BERN,INST APPL PHYS,SIDLERSTR 5 CH-3212 BERN SWITZERLAND UNIV BERN,INST APPL PHYS CH-3212 BERN SWITZERLAND UNIV BERN,INST PATHOL CH-3212 BERN SWITZERLAND UNIV TEXAS,BIOMED ENGN PROGRAM AUSTIN TX 78712
Titolo Testata:
Applied optics
fascicolo: 19, volume: 35, anno: 1996,
pagine: 3328 - 3337
SICI:
0003-6935(1996)35:19<3328:COFPEA>2.0.ZU;2-5
Fonte:
ISI
Lingua:
ENG
Soggetto:
YAG LASER; ER-YAG; THERMAL-DAMAGE; YSGG LASER; EXCIMER; CAVITATION;
Keywords:
MULTIWAVELENGTH LASER SYSTEM; PRESSURE WAVE; CAVITATION; CHANNEL FORMATION; INFRARED-FIBER-DELIVERY SYSTEM; TISSUE DAMAGE; CARTILAGE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
49
Recensione:
Indirizzi per estratti:
Citazione:
H. Pratisto et al., "COMBINATION OF FIBER-GUIDED PULSED ERBIUM AND HOLMIUM LASER-RADIATIONFOR TISSUE ABLATION UNDER WATER", Applied optics, 35(19), 1996, pp. 3328-3337

Abstract

Because of the high absorption of near-infrared laser radiation in biological tissue, erbium lasers and holmium lasers emitting at 3 and 2 pm, respectively, have been proven to have optimal qualities for cutting or welding and coagulating tissue. To combine the advantages of both wavelengths, we realized a multiwavelength laser system by simultaneously guiding erbium and holmium laser radiation by means of a single zirconium fluoride (ZrF4) fiber. Laser-induced channel formation in water and poly(acrylamide) gel was investigated by the use of a time-resolved flash-photography setup, while pressure transients were recordedsimultaneously with a needle hydrophone. The shapes and depths of vapor channels produced in water and in a submerged gel after single erbium and after combination erbium-holmium radiation delivered by means of a 400-mu m ZrF4 fiber were measured. Transmission measurements were performed to determine the amount of pulse energy available for tissueablation. The effects of laser wavelength and the delay time between pulses of different wavelengths on the photomechanical and photothermal responses of meniscal tissue were evaluated in vitro by the use of histology. It was observed that the use of a short (200-mu s, 100-mJ) holmium laser pulse as a prepulse to generate a vapor bubble through which the ablating erbium laser pulse can be transmitted (delay time, 100 mu s) increases the cutting depth in meniscus from 450 to 1120 mu m as compared with the depth following a single erbium pulse. The results indicate that combination of erbium and halmium laser radiation precisely and efficiently cuts tissue under water with 20-50-mu m collateral tissue damage. (C) 1996 Optical Society of America

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 02/12/20 alle ore 15:03:47