Low cost system to measure active power in electrosurgical units
Res. Biomed. Eng. (Online)
;
33(4): 313-323, Oct.-Dec. 2017. tab, graf
Article
Dans Anglais
| LILACS
| ID: biblio-896194
ABSTRACT
Abstract Introduction:
The real-time measurement of active power delivered to patients during the electrosurgical act is still an engineering challenge. Besides, there is no electrosurgical unit on the market capable of doing it according to the normative requirement. Methods This work presents the design of an electronic structure capable to probe the electrosurgical equipment output electrical signals, using low-costs very common resistors, and High Frequency distortions compensation circuits, and process them to provide an analogue signal proportional to the active power, allowing the knowledge and control of the energy delivered to the biological tissue. The reading circuits and the active power calculation method are presented. The power calculation is performed in two stages. The first one consists of a multiplier circuit that uses the readings voltage and current quantities to determine the instantaneous output power, and the second stage is formed by an integrating circuit which determines the average power value, resulting in a rippled continuous voltage, proportional to the active power delivered to the patient or biological tissue. Results Practical tests of the compensation technical are statistically evaluated by means of linear regressions. Results of 23 tests are summarized in a way to demonstrate de effectiveness of the proposed system. Conclusion Analysis of the results demonstrate the efficiency of the proposed system, whose average error is lower than 5%, and correlating them with the standard IEC 60601-2-2, that regulates the operation of electrosurgery units.
Texte intégral:
Disponible
Indice:
LILAS (Amériques)
Type d'étude:
Évaluation en économique de la santé
langue:
Anglais
Texte intégral:
Res. Biomed. Eng. (Online)
Thème du journal:
Engenharia Biomdica
Année:
2017
Type:
Article
Pays d'affiliation:
Brésil
Institution/Pays d'affiliation:
Federal University of Technology/BR
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