Radiofrequency coil for the creation of large ablations: ex vivo and in vivo testing.
J Vasc Interv Radiol
; 23(11): 1522-8, 2012 Nov.
Article
en En
| MEDLINE
| ID: mdl-23101925
ABSTRACT
PURPOSE:
Various radiofrequency (RF) ablation electrode designs have been developed to increase ablation volume. Multiple heating cycles and electrode positions are often required, thereby increasing treatment time. The objective of this study was to evaluate the performance of a high-frequency monopolar induction coil designed to produce large thermal lesions (>3 cm) with a single electrode insertion in a treatment time of less than 10 minutes. MATERIALS ANDMETHODS:
A monopolar nitinol interstitial coil operated at 27.12 MHz and 200 W was evaluated. Ex vivo performance was tested in excised bovine liver (n = 22). In vivo testing (n = 10) was conducted in livers of seven Yorkshire pigs. Visual inspection, contrast-enhanced computed tomography (CT), and pathologic evaluation of ablation zones were performed.RESULTS:
Average ablation volumes in ex vivo and in vivo tests were 60.5 cm(3) ± 14.1 (5.9 × 4.4 × 4.4 cm) and 57.1cm(3) ± 13.8 (6.1 × 4.5 × 4.1cm), with average treatment times of 9.0 minutes ± 3.0 and 8.4 minutes ± 2.7, respectively. Contrast-enhanced CT ablation volume measurements corresponded with findings of gross inspection. Pathologic analysis showed morphologic and enzymatic changes suggestive of tissue death within the ablation zones.CONCLUSIONS:
The RF ablation coil device successfully produced large, uniform ablation volumes in ex vivo and in vivo settings in treatment times of less than 10 minutes. Ex vivo and in vivo lesion sizes were not significantly different (P = .53), suggesting that the heating efficiency of this higher-frequency coil device may help to minimize the heat-sink effect of perfusion.
Texto completo:
1
Banco de datos:
MEDLINE
Asunto principal:
Ablación por Catéter
/
Hígado
Límite:
Animals
Idioma:
En
Revista:
J Vasc Interv Radiol
Asunto de la revista:
ANGIOLOGIA
/
RADIOLOGIA
Año:
2012
Tipo del documento:
Article
País de afiliación:
Canadá