Experience with a new spectra holmium laser probe

Edward B. Diethrich; Osvaldo J. Santiago

doi:10.1117/12.137289

28 August 1992 Experience with a new spectra holmium laser probe

Edward B. Diethrich, Osvaldo J. Santiago

Proceedings Volume 1642, Diagnostic and Therapeutic Cardiovascular Interventions II; (1992) https://doi.org/10.1117/12.137289
Event: OE/LASE '92, 1992, Los Angeles, CA, United States

Abstract

The initial enthusiasm related to laser angioplasty witnessed just a few years ago has waned considerably owing to the failure of thermal laser technology to meet clinical expectations. While the initial procedural success rate for the hot-tip probe was acceptable (about 79% in most series), mid- and long-term studies have shown a disappointing recurrence rate. These follow-up data have dictated a new course for the development of laser technology in the vascular system. We evaluated a new delivery system using holmium:YAG laser energy for its ability to recanalize obstructive peripheral atherosclerotic lesions in over 200 patients. The 2.5 mm Spectra Holmium laser probe delivered 2100 nm laser energy at 1000-1200 mJ/pulse at 10 Hz to achieve a maximum energy density of 4000 mJ/mm2. Maximum temperature was 85 degC. Among all lesions, 54% could not be crossed with a wire. Of these, 77% were recanalized by the probe by the probe. Average lasing time for occlusions: 44.8 seconds, and 71.6 seconds for stenoses. Residual stenosis after lasing: 68% in occlusions and 59% in stenoses. Laser success in all lesions was 76%. The Spectra Holmium probe was successful in opening occlusions but had little effect on stenoses due to the small probe size and limited laser aperture. There were no complications related to the laser, and no thermal effect was noted on direct angioscopic observation. More effective multifiber catheters are needed for greater tissue ablation.

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Edward B. Diethrich and Osvaldo J. Santiago "Experience with a new spectra holmium laser probe", Proc. SPIE 1642, Diagnostic and Therapeutic Cardiovascular Interventions II, (28 August 1992); https://doi.org/10.1117/12.137289

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KEYWORDS

Holmium

Laser applications

Laser beam diagnostics

Laser energy

Laser ablation

Laser development

Laser systems engineering

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