# US 8,465,483 B2 · Circuit for radiofrequency devices applicable to living tissues and device containing same

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- Number: US 8,465,483 B2
- Document ID: US8465483B2
- Status: Granted
- Kind: B2
- Application number: 12/665,180
- Filed: 2008-05-26
- Published: 2010-08-05
- Granted: 2013-06-18
- Earliest claimed: 2007-06-20
- Assignees: Indiba, S.A.
- Applicants: Javier Lario Garcia; José Calbet Benach; Jorge Buisan Escartin
- Inventors: Javier Lario Garcia; José Calbet Benach; Jorge Buisan Escartin
- Web page: https://patentgrep.com/patent/US8465483B2

## CPC

- A61B 18/1206: {Generators therefor}
- H03H 7/0115: {comprising only inductors and capacitors (H03H7/075, H03H7/09, H03H7/12, H03H7/13 take precedence)}
- H03H 7/175: {Series LC in series path (H03H7/1783 takes precedence)}
- H03H 7/1775: {Parallel LC in shunt or branch path (H03H7/1791 takes precedence)}
- A61B 18/1402: {Probes for open surgery}
- A61B 2018/128: {generating two or more frequencies}
- A61B 2018/1293: {having means to prevent interference}
- A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D)
- H03H: IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS (waveguides, resonators, lines or other devices of the waveguide type H01P)

## Abstract

The supply circuit for the electrodes comprises a series resonant filter and a parallel resonant filter, tuned to admit the fundamental signal of the input signal and simultaneously and exponentially attenuate the remaining harmonics by increasing the frequency thereof, in such a way that the input signal with harmonics only passes the fundamental signal without attenuation to the output, while the harmonics causing interferences are increasingly attenuated as their frequency is raised.

## Claims

### Claim 1

A circuit for supplying output electrodes of a radiofrequency device applicable to living tissues, said circuit comprising:
a transformer having a primary winding, a secondary winding, and a turn ratio of 1:N, where N is a real number;
a resonant serial filter connected to the primary winding of the transformer having an inductor LS1 connected in series with a capacitor CS1; and
a resonant parallel filter connected to the secondary winding of the transformer having an inductor Lp connected in parallel with a capacitor CP;
wherein the resonant serial filter and the resonant parallel filter allow a fundamental signal of an input signal, which includes harmonics, to simultaneously pass through and exponentially attenuate the harmonics as a frequency of said harmonics increases, and
wherein an output frequency of said circuit is varied such that a combined impedance of a plurality of output electrodes connected to the circuit, and living tissue in contact with the output electrodes matches an impedance of the circuit.

### Claim 2 (depends on 1)

The circuit of claim 1, wherein the inductor LP of the resonant parallel filter is the parasitic inductance of the secondary winding of the transformer.

### Claim 3 (depends on 1)

The circuit of claim 1 including anti-stimulus capacitors CS2—CAP, CS2—RES at each output electrode, each of said anti-stimulus capacitors CS2—CAP, CS2—RES having a corresponding inductor LS2-CAP, LS2-RES connected in series, the inductors LS2-CAP, LS2-RES having values that resonate at a fundamental frequency of the input signal.

### Claim 4 (depends on 1)

The circuit of claim 1, wherein the inductor LS1 and the capacitor CS1 of the resonant serial filter have a first impedance to the fundamental frequency of the input signal and a second impedance to the harmonics of the input signal, the first impedance being lower than the second impedance.

### Claim 5 (depends on 1)

The circuit of claim 1, wherein the inductor LP and the capacitor Cp of the resonant parallel filter have a first impedance to the fundamental frequency of the input signal and a second impedance to the harmonics of the input signal, the first impedance being higher than the second impedance.

### Claim 6 (depends on 1)

The circuit of claim 1, wherein the radiofrequency device is a diathermy device.

### Claim 7 (depends on 1)

The circuit of claim 1, wherein the radiofrequency device is an electroscalpel device.