Microwave coagulation using a perfusion microwave electrode: Preliminary experimental study using ex vivo and in vivo liver
| Autor: | Kozo Ikeda, Toshihito Seki, Ryosuke Inokuchi, Toshiki Asayama, Rinako Kawamura, Hideto Umehara, Kazuichi Okazaki, Toru Tamai |
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| Jazyk: | angličtina |
| Rok vydání: | 2011 |
| Předmět: |
Cancer Research
Pathology medicine.medical_specialty Chemistry Radiofrequency ablation medicine.medical_treatment General Medicine Articles law.invention Immunology and Microbiology (miscellaneous) In vivo law Electrode medicine Coagulation (water treatment) Perfusion Saline Microwave Ex vivo Biomedical engineering |
| Popis: | To assess the coagulation capability of a perfusion microwave electrode (PME) as a key component of microwave coagulation therapy, a preliminary experimental study was performed using ex vivo and in vivo livers. For a microwave electrode, a PME was employed. Using a PME, saline was passed through the electrode and injected continuously into the target tissue. Using an ex vivo bovine liver, the range of tissue coagulation was measured for various volumes of infused saline and microwave outputs. Using an in vivo porcine liver, the efficiency of coagulation by a PME was compared with that of radiofrequency ablation (RFA) using a cool-tip needle. In an ex vivo bovine liver, the range of tissue coagulation increased as the flow rate of saline increased. In the in vivo porcine liver, the range of coagulation was similar to that found in the ex vivo bovine liver. With a PME under conditions of a microwave output of 80 W, a flow rate of 3 ml/min and irradiation time of 5 min, the range of coagulation was 44.8±2.8 mm [maximum vertical diameter: (a)] x 31.2±2.4 mm [maximum transverse diameter: (b)]. The range of RFA (cool-tip needle) at 12 min was 46.0±2.0 mm (a) x 30.2±2.0 mm (b). With only 5 min of microwave irradiation, the use of a PME enabled induction of the same range of coagulation that was obtainable by RFA for 12 min. In comparison with microwave coagulation without saline infusion, the use of a PME made it possible to extend the range of tissue coagulation to a range equal to that of RFA in a short time. Microwave coagulation using a PME may be one of the suitable tissue coagulation systems for local ablation treatment. |
| Databáze: | OpenAIRE |
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