Nd-YAG Laser Damage to Metal and Silicone Endobronchial Stents
| Autor: | Thomas G. Shanks, Julius J. Dalupang, Henri G. Colt |
|---|---|
| Rok vydání: | 2001 |
| Předmět: |
Pulmonary and Respiratory Medicine
medicine.medical_specialty Experimental model business.industry medicine.medical_treatment Stent Laser science Critical Care and Intensive Care Medicine Laser Surgery law.invention chemistry.chemical_compound Silicone chemistry law Nd:YAG laser medicine In vitro study Cardiology and Cardiovascular Medicine Nuclear medicine business Power density |
| Zdroj: | Chest. 120:934-940 |
| ISSN: | 0012-3692 |
| DOI: | 10.1378/chest.120.3.934 |
| Popis: | Study objective To identify margins of safety within which bronchoscopic Nd-YAG laser resection can be performed without damaging indwelling tracheobronchial stents. Design Experimental in vitro study simulating a patient-care environment. Methods Uncovered and covered metal Wallstent (Schneider; Zurich, Switzerland) and Dumon (Bryan Corporation; Woburn, MA) silicone stents were deployed in the tracheobronchial tree of a ventilated and oxygenated (fraction of inspired oxygen, 40%) heart-lung block of a dead canine. Rigid bronchoscopic Nd-YAG (1,064 nm) laser procedures were performed in order to deliver laser energy using fiber-to-target distances of 10 mm and 20 mm, and noncontact, continuous-mode, 1-s pulses at power settings of 10 W, 30 W, and 40 W. The major outcome measure was laser-induced stent damage, defined as discoloration, ignition, or breakage. This was assessed using six power densities: 75 W/cm 2 , 172 W/cm 2 , 225 W/cm 2 , 300 W/cm 2 , 518 W/cm 2 , and 690 W/cm 2 . Results The uncovered Wallstent and the silicone stent remained intact at power densities of 75 W/cm 2 (10 W, 20 mm) and 172 W/cm 2 (10 W, 10 mm), but were damaged at power densities > 225 W/cm 2 (30 W, 20 mm). The covered Wallstent was damaged at all power densities tested. Conclusion Uncovered Wallstent and silicone stents are not damaged when Nd-YAG laser energy is delivered using power densities ≤ 172 W/cm 2 (10 W, 10 mm). Covered Wallstents, however, had a high likelihood of ignition at all power densities studied. |
| Databáze: | OpenAIRE |
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