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Interstitial laser coagulation of the prostate. An experimental study
T A McNicholas1, A C Steger, S G Bown
1Institute of Urology and National Medical Laser Centre, University College, London.
British Journal of Urology
|April 1, 1993
Summary
A novel laser therapy uses interstitial Neodymium-Yttrium Aluminium Garnet (Nd-YAG) laser energy to precisely coagulate prostate tissue. This minimally invasive technique shows promise for treating benign prostatic hyperplasia and localized prostate cancer.
Area of Science:
- Urology
- Oncology
- Medical Devices
Background:
- Benign and malignant prostatic diseases require effective treatment options.
- Current therapies for prostate conditions have limitations.
- Minimally invasive techniques are sought for prostate tissue ablation.
Purpose of the Study:
- To describe a percutaneous interstitial laser coagulation method for prostatic tissue.
- To evaluate this technique as an alternative or adjunct to existing prostate therapies.
- To assess the safety and efficacy of low-power Nd-YAG laser interstitial therapy.
Main Methods:
- Implantation of 200-600 micron diameter optical fibers into beagle prostates (n=11).
- Transmission of Neodymium-Yttrium Aluminium Garnet (Nd-YAG) laser energy at low powers (1-2W) and longer exposures (400-1500s).
- Ultrasound scanning for monitoring fiber placement, coagulation zones, and lesion healing.
Main Results:
- Well-defined areas of coagulative necrosis were created with minimal tissue charring.
- A 1000J energy dose produced a 1 cm lesion by day 4.
- Treated areas healed by fibrosis and cystic degeneration within 6 weeks.
- Multiple fibers created larger lesions suitable for extensive disease.
Conclusions:
- Percutaneous interstitial laser coagulation is a viable method for prostatic tissue ablation.
- The technique is well-tolerated and effective in creating controlled lesions.
- This approach may benefit patients with moderate benign prostatic hyperplasia and small prostate tumors.