Thermal and optical behavior of sapphire fiber tips for laser angioplasty

Simon Ashley; Stephen G. Brooks; Abdurrazak A. Gehani; Ralph C. Kester; Michael Ralph Rees

doi:10.1117/12.17528

1 July 1990 Thermal and optical behavior of sapphire fiber tips for laser angioplasty

Simon Ashley, Stephen G. Brooks, Abdurrazak A. Gehani, Ralph C. Kester, Michael Ralph Rees

Proceedings Volume 1201, Optical Fibers in Medicine V; (1990) https://doi.org/10.1117/12.17528
Event: OE/LASE '90, 1990, Los Angeles, CA, United States

Abstract

Atraumatic rounded contact probes made from artificial sapphire crystal were developed for general laser surgery and are currently being evaluated for use in percutaneous laser angioplasty utilising continuous wave (cw) Nd-YAG energy (1064nm). The thermal and optical characteristics of five different types of rounded sapphire probe [Surgical Laser Technologies (SLT) - SMTR (1.8mm), MTh (2.2mm), MTRL (3.0mm); Living Technology - LT (2.2mm), OS (2.2mm)] were investigated and related to efficiency of contact ablation of arterial wall in vitro. The sapphire probes were mounted on catheters containing a 0.6 mm quartz optical fiber, coupled to a cw Nd-YAG laser. All probes produced a similar beam profile but there was some variation in their forward transmission of energy (54-85%).Probe heating occurs due to energy absorption within the sapphire and was measured in air by infrared thermography. There was a high temperature gradient from the front surface of the sapphires to the probe rim. But, at energy settings used clinically (10 J pulses, 10 Watts for 1 second) the SMTR, MTR, and MTRL probes exhibited a higher mean temperature rise (63-74 C) than the OS and LT probes (20 C) [3-way ANOVA p

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Simon Ashley, Stephen G. Brooks, Abdurrazak A. Gehani, Ralph C. Kester, and Michael Ralph Rees "Thermal and optical behavior of sapphire fiber tips for laser angioplasty", Proc. SPIE 1201, Optical Fibers in Medicine V, (1 July 1990); https://doi.org/10.1117/12.17528

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