EP 0836433 A1 19980422 - DIGITAL WAVEFORM GENERATION FOR ELECTROSURGICAL GENERATORS
Title (en)
DIGITAL WAVEFORM GENERATION FOR ELECTROSURGICAL GENERATORS
Title (de)
DIGITALE WELLENFORMERZEUGUNG FÜR ELEKTROCHIRGISCHE GENERATOREN
Title (fr)
GENERATION NUMERIQUE DE FORMES D'ONDES POUR GENERATEUR ELECTROCHIRURGICAL
Publication
Application
Priority
- IB 9600551 W 19960603
- US 47134495 A 19950606
Abstract (en)
[origin: WO9639088A1] An electrosurgical generator (10) has an improved design for generating output waveforms using a microprocessor (15). The waveforms are generated in the form of a serial digital output from the microprocessor (15). The serial digital output is transformed into an electrosurgical RF output in an amplifier stage. The improved design also includes a monitoring circuit to continuously monitor the serial digital output by time-averaging the output, and then comparing that value with a threshold. The electrosurgical generator (10) comprises a microprocessor (15), an algorithm in the microprocessor (15) capable of toggling an output port of the microprocessor (15), an output amplifier (16), an adjustable high voltage DC power supply (17), a patient circuit including an active electrode (12) and a return electrode (13). The electrosurgical generator (10) may further comprise a mode selector (20) for selecting one of a plurality of pulse patterns in the serial digital output, and a plurality of command sequences in the algorithm, where each command sequence is designed to produce one of the plurality of patterns. There may also be a tank damp circuit (22) for reducing the amplitude of voltage spikes in the electrosurgical output, and a pulse suppression circuit. The monitoring circuit comprises a low pass filter (19) and a comparator to verify operation of the waveform generator.
IPC 1-7
IPC 8 full level
A61B 18/12 (2006.01)
CPC (source: EP)
A61B 18/1206 (2013.01); A61B 2018/00642 (2013.01); A61B 2018/00666 (2013.01); A61B 2018/00684 (2013.01); A61B 2018/00726 (2013.01); A61B 2018/00761 (2013.01)
Citation (search report)
- [A] WO 9509577 A1 19950413 - VALLEYLAB INC [US]
- [A] US 5167658 A 19921201 - ENSSLIN FRIEDER H [US]
- See references of WO 9639088A1
Designated contracting state (EPC)
AT BE CH DE DK ES FI FR GB GR IE IT LI LU NL SE
DOCDB simple family (publication)
WO 9639088 A1 19961212; AU 5700996 A 19961224; AU 710400 B2 19990916; CA 2220909 A1 19961212; CA 2220909 C 20010227; EP 0836433 A1 19980422; JP H10506564 A 19980630
DOCDB simple family (application)
IB 9600551 W 19960603; AU 5700996 A 19960603; CA 2220909 A 19960603; EP 96915135 A 19960603; JP 50026097 A 19960603