A - Human Necessities – 61 – B
Patent
A - Human Necessities
61
B
A61B 18/12 (2006.01) A61B 18/14 (2006.01) A61B 17/39 (1995.01)
Patent
CA 2160017
A circuit, for monitor- ing and controlling parame- ters of an electrosugical unit (10), ESU, relative to load and the RF energy, has a load re- sponsive output sensing cir- cuit (11) that measures the ESU load. A signal modifier (12) attached to tbe sensing circuit (11) enhances the sig- nals measured and transmits them to a buffer (13). An ana- log to digital converter (18), A/D, digitizes the signals and samples wave pulse train at about eight million samples per second. A data memory (21) stores the digitizod sig- nals. An RF drive clock (27) connects to the ESU output; a sample clock (19) uses phase shifting to interrogate the in- put signals to a processor (20), DSP, at a greater sampling rate of frequency than without. The DSP receives the stored signals from the data memory (21) and processes them while monitor- ing and calculating ESU parameters measured, i.e. voltage, current, power, load impedance, leakage current, peak to peak voltage, peak to pealc current, spectial content and/or crest factor of the RF wave pulse train energy to use as controlling feedback to eitber a high voltage power supply in tbe ESU, regulating tbe RF drive pulses or both. A method monitors and controls the ESU relative to load and has the steps of collecting parameters with the ESU output sensing circuit (11) responsive to loads; enhancing signals with the signal modifier (12); transmitting signals to the buffer (13); converting signals with the A/D converter (18); storing signals in the data memory (21); receiving signals in the DSP, and processing, monitoring and controlling signals by repeatedly measuring ESU output parameters.
Klicek Michael Steve
Paterson William Gary
Sherwood Services Ag
Smart & Biggar
LandOfFree
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