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01.04.2010 | Topic Paper | Ausgabe 2/2010

World Journal of Urology 2/2010

New alternatives for laser vaporization of the prostate: experimental evaluation of a 980-, 1,318- and 1,470-nm diode laser device

Zeitschrift:
World Journal of Urology > Ausgabe 2/2010
Autoren:
Felix Wezel, Gunnar Wendt-Nordahl, Nina Huck, Thorsten Bach, Christel Weiss, Maurice Stephan Michel, Axel Häcker
Wichtige Hinweise
F. Wezel and G. Wendt-Nordahl have contributed equally to this work.

Abstract

Purpose

Several diode laser systems were introduced in recent years for the minimal-invasive surgical therapy of benign prostate enlargement. We investigated the ablation capacities, hemostatic properties and extend of tissue necrosis of different diode lasers at wavelengths of 980, 1,318 and 1,470 nm and compared the results to the 120 W GreenLight™ HPS laser.

Methods

The laser devices were evaluated in an ex vivo model using isolated porcine kidneys. The weight difference of the porcine kidneys after 10 min of laser vaporization defined the amount of ablated tissue. Blood loss was measured in blood-perfused kidneys following laser vaporization. Histological examination was performed to assess the tissue effects.

Results

The side-firing 980 and 1,470 nm diode lasers displayed similar ablative capacities compared to the GreenLight™ HPS laser (n.s.). The 1,318-nm laser, equipped with a bare-ended fiber, reached a higher ablation rate compared to the other laser devices (each P < 0.05). A calculated ‘output power efficiency per watt’ revealed that the 1,318-nm laser with a bare-ended fiber reached the highest rate compared to the side-firing devices (each P < 0.0001). All three diode lasers showed superior hemostatic properties compared to the GreenLight™ HPS laser (each P < 0.01). The extend of morphological tissue necrosis was 4.62 mm (1,318 nm), 1.30 mm (1,470 nm), 4.18 mm (980 nm) and 0.84 mm (GreenLight™ HPS laser), respectively.

Conclusion

The diode lasers offered similar ablative capacities and improved hemostatic properties compared to the 120 W GreenLight™ HPS laser in this experimental ex vivo setting. The higher tissue penetration of the diode lasers compared to the GreenLight™ HPS laser may explain improved hemostasis.

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