KTP laser

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A KTP laser (manufacturer's name GreenLight ) is a laser scalpel based on potassium titanyl phosphate (KTP) . It is used in operations to enlarge the prostate , also known as benign prostatic hyperplasia (BPH). A laser beam is directed into the treatment area via a fiber optic endoscopic system, the cystoscope , in order to vaporize the tissue to be removed there. The laser light is green with a wavelength of 532 nm . The light of this wavelength is particularly strong by the red hemoglobin , but only minimally absorbed by water, which enables a so-called PVP, the photoselective vaporization of the prostate.

history

The method was developed by the Mayo Clinic together with the Laserscope company from San Jose / California. KTP lasers have been in use in Germany since 2002. The devices of the first generation have a laser power of 80 watts , the second generation has diode-pumped solid-state lasers with a power of 120 watts, the third generation works with 180 watts and has been used in Germany since 2010.

application

Therapy with a KTP laser is one of many laser procedures that are currently used for BPH. Other laser processes use wavelengths in the infrared range, for example the holmium: YAG laser with 2.1 µm wavelength, the thulium laser, depending on the version, with 1.9-2.0 µm wavelength and the diode laser, depending on the version, with 940-1300 nm Wavelength. Because the removed tissue vaporizes and vaporizes during photo-selective vaporization with the help of KTP or LBO ( lithium borate laser ), it is not available for the histological, histological examination for the presence of prostate cancer . This applies to all vaporizing laser technologies, including diode laser vaporization.

In other laser techniques such as HoLEP holmium (Ho: YAG) laser enucleation of the prostate, ThuVEP thulium (Tm: YAG) laser vapoenucleation of the prostate, ThuLEP (Tm: YAG) -assisted laser enucleation the prostate as well as the classic monopolar high frequency (HF) transurethral resection of the prostate (TUR-P) and the bipolar TUR-P, the examination for a prostate carcinoma is possible on the resected tissue, the removed tissue.

Advantages and disadvantages

According to studies by the manufacturer, the advantage of the method over conventional transurethral resection of the prostate is a very low risk of bleeding, so that patients can also be treated under anticoagulant therapy. As French researchers published in a study in May 2010, treatment with a KTP laser can pose a risk of post-operative erectile dysfunction.

literature

  • RS Malek, RS Kuntzman, DM Barrett: Photoselective potassium-titanyl-phosphate laser vaporization of the benign obstructive prostate: observations on long-term outcomes. In: The Journal of Urology . 174, 2005, pp. 1344-1348.
  • DM Bouchier-Hayes, P. Anderson, S. Van Appledorn, P. Bugeja, AJ Costello: KTP laser versus transurethral resection: early results of a randomized trial. In: Journal of Endourology. Vol. 20, Iss. 8, Aug 2006, pp. 580-585.

Individual evidence

  1. ^ First clinic in Germany with the XPS Green Light Laser. ( Memento from October 5, 2011 in the Internet Archive ) Medical Mission Clinic Würzburg: The third generation of devices with a performance increase of 50% to 180 watts [...]
  2. ↑ Richard Hautmann : Urology. 4th edition. Springer, Heidelberg 2010, ISBN 978-3-642-01158-0 , pp. 186-187. (Google book preview)
  3. ↑ TR Herrmann, EN Liatsikos, U. Nagele, O. Traxer, AS Merseburger: EAU Guidelines Panel on laser technologies. EAU guidelines on laser technologies. In: Eur Urol . 61, 2012, pp. 783-795. PMID 22285403
  4. ↑ Franck Bruyère, Alexis Puichaud, Helder Pereira, Benjamin Faivre d'Arcier, Antoine Rouanet, Aurélie Paule Floc'h, Thomas Bodin, Nicolas Brichart: Influence of Photoselective Vaporization of the Prostate on Sexual Function: Results of a Prospective Analysis of 149 Patients with long-term follow-up. (PDF) In: European Urology . May 26, 2010, accessed September 17, 2010 .