Constant power electrosurgical generator: Biological tissue cutting and sealing

doi:10.3969/j.issn.2095-4344.2013.41.016

Abstract

Abstract:

BACKGROUND: With the development of medical instruments, more and more traditional surgical operations are replaced by minimally invasive surgeries. In minimally invasive surgery, cutting and sealing tissue is a conventional procedure; however, due to the limitation of space and vision, the ordinary methods are not suitable for minimally invasive surgery.
OBJECTIVE: To develop high frequency electrosurgical generator that has a constant power output and ability for tissue cutting and closing.
METHODS: In order to improve the efficiency of tissue cutting and sealing in surgical, a kind of high-frequency energy generator was developed for tissue cutting and sealing. The instrument consisted of switching power supply with adjustable amplitude, high-frequency power amplifier, impedance monitor and microcontroller. The energy converter composed of switching power supply and high-frequency power amplifier converted the 220 V, 50 Hz utility powers to a kind of high-frequency energy with 450 kHz and applied on tissues. Impedance monitor would real-timely detect the electrical parameter impacting on tissue that was provide the amount of feedback to microcontroller in order to complete constant power control and bioimpedance determination by the controller.
RESULTS AND CONCLUSION: The experimental results indicated that the instrument could rapidly and stably provide high-frequency energy, and could detect the biological impedance in real-time, achieve constant power output through feedback control, and could cut and close the biological tissue efficiently.

Key words: surgical procedures, minimally invasive, wound closure techniques, tissues, electric impedance

CLC Number:

R318

Ou Kong-wu, Zhou Yu, Yan Sheng-jie, Li Dian-li, Yan Bo-wen, Song Cheng-li. Constant power electrosurgical generator: Biological tissue cutting and sealing[J]. Chinese Journal of Tissue Engineering Research, 2013, 17(41): 7290-7296.

Figures/Tables 5

References

[1] Friedrichs DA, Erickson RW, Gilbert J. A new dual current-mode controller improves power regulation in electrosurgical generators. IEEE Trans Biomed Circuits Syst. 2012;6(1):39-44.
[2] Goble CCO. Electrosurgery system and method：United States, 6228081 [P].2001-05-08.
[3] 天津市生物医学工程学会. 生物医学工程的基础与临床[M]. 天津科学技术出版社, 1988.
[4] Roby K, Varjan S, Stascavage K, et al. A novel electrocauterydevice to increase coagulation rate and reduce thermal damage. Bioengin Conf (NEBEC). 2011,IEEE 37th Annual Northeast:1-2.
[5] Dodde RE, Gee JS, Geiger JD, et al. Monopolarelectrosurgical thermal management for minimizing tissue damage. IEEE Trans Biomed Eng. 2012;59(1):167-173.
[6] 胡长阳. D类和E类开关模式功率放大器[M]. 北京: 高等教育出版社, 1985:4-6.
[7] 赵修科. 磁性元件分册[M]. 沈阳: 辽宁科学技术出版社, 2002: 65-79.
[8] Pressman AI. 开关电源设计(第2版)[M]. 北京：电子工业出版社, 2005.
[9] 张占松, 蔡宣三. 开关电源的原理与设计[M]. 北京: 电子工业出版社, 1998:162-179.
[10] 刘豹, 唐万生. 现代控制理论[M]. 北京: 机械工业出版社, 2006:157-186.
[11] Wei XQ,Kuroiwa S,Nagashima T,et al. Push-Pull Class-E Power Amplifier for Low Harmonic-Contents and High Output-Power Applications. IEEE Trans Circ Systems. 2012; 59(9):2137-2146.
[12] Wong SC, Tse CK. Design of Symmetrical Class E Power Amplifiers for Very Low Harmonic-Content Applications. J Magaz. 2005,52(8):1684-1690.
[13] Sokal NO, Raab FH. Harmonic output of Class E RF amplifiers and load coupling network design. J Solid State Ciecuits. 1977;12(1):86-88.
[14] 吴金强．智能型医用功能高频电刀的研究[D]．北京航空航天大学，2000.
[15] Zhou Y,Xu WD, Cui XX, et al. A New High-Frequency Electrotome Output Detection System. 2011 4th International Conference on Biomedical Engineering and Informatics (BMEI). 2011; 2:1019-1022.
[16] 周宇,杨翠微,方祖祥. 一种新的心外膜电位标测信号分析方法[J]. 仪器仪表学报,2009, 30(1): 76-81.
[17] Xu WD, Cui XX, SJ, et al. A new high-frequency electrotome output detection system. BMEI. 2011;2:1019-1022.
[18] Kennedy JS, Stranahan PL, Taylor KD. High burst-strength, feedback-controlled bippolar vessel sealing. Surg Endosc. 1998;12: 876-878.
[19] Salameh JR, Schwartz JH, Hildebrandt DA. Can LigaSure seal and divide the small bowel? Am J Surg. 2006;191(6): 791-793.
[20] Krum H, Schlaich M, Whitbourn R. Catheter-based renal sympathetic denervationfor resistant hypertension: a multicentre safety and proof-of-principle cohort study. Lancet. 2009;373(9671):1275-1281.