Bone tissue ablation with sub-microS pulses of a Q-switch CO(2) laser: histological examination of thermal side effects
| Autor: | Thomas Mitra, S. Fahimi-Weber, Peter Hering, Mikhail Ivanenko, W. Wierich |
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| Rok vydání: | 2002 |
| Předmět: |
Materials science
Hot Temperature Swine medicine.medical_treatment Ribs Dermatology In Vitro Techniques Bone tissue Bone and Bones law.invention law medicine Animals Femur Cartilage Lasers Histology Anatomy Carbon Dioxide Ablation Laser Wavelength medicine.anatomical_structure Surgery Trabecular meshwork Biomedical engineering |
| Zdroj: | Lasers in medical science. 17(4) |
| ISSN: | 0268-8921 |
| Popis: | The goal of this study is an in vitro evaluation of thermal side-effects by the application of short sub- micro s CO(2) laser pulses in combination with an air-water spray on different types of bone tissue. A mechanically Q-switched CO(2) laser delivered 300 ns pulses at 9.6 micro m wavelength, which were focused down to a spot size of 440 micro m on the tissue (a corresponding energy density of 9 J/cm(2)). Bone samples (blocks from pig femur, rib, or cartilage) were moved through the beam repeatedly until 1-5 mm deep cuts were produced. An air driven water spray was applied to prevent the tissue dehydration. Subsequent visual and histological examinations revealed no carbonisation, melting traces or fissuring of the tissue. An extremely narrow, 2-6 micro m thick thermally altered layer was observed at the cut border in compacta and cartilage. No accumulation of the thermal damage occurred with increasing cut depth. Laser incisions in trabecular tissue were accompanied with a 100-200 micro m thick zone of thermal necrosis in bone marrow. The difference from compacta and cartilage can be explained considering the particular character of the spreading of the ablation products in the trabecular meshwork. Minor thermal side effects make the Q-switched and probably other short pulsed CO(2) laser systems interesting for hard tissue surgery. |
| Databáze: | OpenAIRE |
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