Path: TopS1-Final ProjectEngineering Physics-FTI2017

PENGEMBANGAN SISTEM PENDINGIN EKSTERNAL PADA ABLASI RADIO FREKUENSI DENGAN ELEKTRODE BIPOLAR FORCEPS

EXTERNAL COOLING SYSTEM DEVELOPMENT IN RADIOFREQUENCY ABLATION WITH BIPOLAR FORCEPS ELECTRODE

Undergraduate Theses from JBPTITBPP / 2017-09-27 11:05:22
Oleh : Ardityo Giantra, S1 - Department of Engineering Physics
Dibuat : 2017-09-08, dengan 1 file

Keyword : ablasi radio frekuensi, sistem pendingin eksternal, bipolar forceps, heat sink effect, perencanaan terapi

Ablasi radio frekuensi digunakan sebagai prosedur operasi untuk merusak jaringan biologis abnormal. Prosedur ini menghasilkan kerusakan permanen pada jaringan. Masalah yang dihadapi yaitu pembentukan kerusakan jaringan yang berukuran terbatas dan relatif kecil. Luka yang berukuran terbatas disebabkan oleh berhentinya proses transfer kalor pada jaringan yang telah mengalami karbonisasi. Karakteristik jaringan seperti konduktivitas elektrik dan termal nilainya menurun signifikan pada temperatur tertentu. Diperlukan suatu metode untuk membuat luka ablasi yang merata dan berukuran relatif lebih besar. Penelitian ini mengajukan solusi berupa sistem pendingin eksternal sebagai tambahan perangkat ablasi standar. Tujuan penelitian ini yaitu mengetahui efek penggunaan sistem pendingin eksternal pada ablasi. Pengujian dilakukan pada liver sapi melalui metode eksperimen ex-vivo dan metode pemodelan. Pemodelan dilakukan melalui perangkat lunak COMSOL Multiphysics. Sistem pendingin eksternal yang dikembangkan berupa pipa membentuk cincin yang dialirkan air dingin pada temperatur konstan dan diberikan variasi debit aliran melalui pengaturan pada pompa peristaltik. Pipa berbentuk cincin disentuhkan dengan permukaan jaringan selama ablasi dilakukan. Ablasi dilakukan menggunakan mode cut pengaturan 30 W selama satu menit menggunakan elektrode bipolar forceps. Untuk keperluan pengujian temperatur diukur melalui termokopel selama ablasi berlangsung. Jaringan hasil ablasi dipotong dan diukur dimensinya untuk analisis. Hasil eksperimen penggunaan sistem pendingin eksternal menunjukkan temperatur maksimum yang dicapai bernilai lebih rendah dibandingkan dengan eksperimen tanpa penggunaan sistem pendingin eksternal. Eksperimen juga menghasilkan data bahwa penggunaan sistem pendingin eksternal dapat meningkatkan ukuran luka ablasi. Hasil model perangkat lunak menunjukkan profil temperatur dan ukuran luka yang serupa dengan eksperimen. Penggunaan sistem pendingin eksternal sebagai perangkat tambahan dalam electrosurgery sesuai digunakan dengan tujuan meningkatkan ukuran luka jaringan.

Deskripsi Alternatif :

Radio frequency ablation has been used in many surgery procedures to disrupt the abnormalities in biological tissue. The procedure results in permanent damage to the tissue. The common problem faced is the uneven distribution of necrotic tissue that led to a limited lesion size. Limited lesion size happen because thermal transfer is stopped in charring tissue. Charring tissue decrease its value in electrical and thermal conductivity at a certain temperature. There should be method to overcome the needs to produce more even and larger lesion size. This study proposed an improvement to the procedure with experiment and modeling methods. Exterior cooling system is built as an addition instrument to the radio frequency ablation instruments available. The study was done to quantify the cooling effect of the external cooling system used. Object of the study is part of liver tissue in ex-vivo condition. Cooling coil is supplied with cooled water at constant temperature and set into several volume flow rates through peristaltic pump. The coil contacted to the surface of the tissue when ablation was executed. The ablation was done for a minute with bipolar forceps electrode at 30 W output setting. Temperature measurement of the tissue were observed during ablation time. The ablated tissues were cut, the width and the height of the lesion were measured for analysis. The modeling is done through COMSOL Multiphysics software. The with-cooling coil experiment showed the maximum temperature reached was lower than the no-cooling coil experiment. The experiment also showed that by using exterior cooling coil there were increases in the size of the lesions. Models acquired from the software show the similar temperature profile and lesion size with the experiment. The use of external cooling system as additional instrument is suitable as an addition instruments to be used in electrosurgery which objectives is to make a larger lesion size.

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