ABSTRACT
Objective To design a thermal alarm sensing controller to avoid burns by the high-frequency electric knife in the operating room. Methods The system development of the controller was executed under Visual DSP, and a thermal alarm sensing control method based on multi-thread temperature feedback regulation was proposed for eliminating the risk of the burns by the high-frequency electric knife in the operating room. The functional and technical indexes of the controller were analyzed to construct its overall framework model, the control law was designed for the temperature feedback control of the controller, and proportion-integral-derivative (PID) control algorithm was applied to the improvement of the controller. Modular design was involved in the controller hardware which was composed of the temperature sensing AD module, baseline drift suppression module, high voltage adjust module, interrupt module and alarm communication circuit. Software process was designed, and then simulation experiment was carried out to test the performances of the controller. Results The controller gained advantages in high loading performance and high-frequency baseline at zero level to realize compensation, and was gifted with high anti-interference ability and precision when fulfilling the safety control of the high-frequency electric knife by multi-thread temperature regulation and overheating interrupt. Conclusion The controller behaves well in the alarm against the burns by the high-frequency electric knife in the operating room.