# US 4,398,534 A · Electrical surgical knife device

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- Number: US 4,398,534 A
- Document ID: US4398534A
- Status: Granted
- Kind: A
- Application number: 06/210,282
- Filed: 1980-11-25
- Granted: 1983-08-16
- Earliest claimed: 1979-12-04
- Assignees: Olympus Optical Co., Ltd.
- Inventors: Toshihiko Hagiwara
- Web page: https://patentgrep.com/patent/US4398534A

## CPC

- A61B 18/1206: {Generators therefor}
- A61B 18/12: by passing a current through the tissue to be heated, e.g. high-frequency current
- H02H 11/00: Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result
- A61B 2018/0066: {without feedback, i.e. open loop control}
- A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D)
- H02H: EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS (indicating or signalling undesired working conditions G01R, e.g. G01R31/00, G08B; locating faults along lines G01R31/08; emergency protective devices H01H)

## Abstract

An electrical surgical knife device stops supplying an incision current, a coagulation current or a blend current whenever at least two of selection switches are actuated at the same time, said selection switches being provided for selecting the incision current, the coagulation current and the blend current, respectively.

## Claims

### Claim 1

An electric surgical knife device comprising:
current generating means for generating an incision current, coagulation current and blend current;
current selection means for selecting one of the currents generated by said current generating means;
detector means coupled to said current selection means for generating an output signal when said current selection means selects any two of the currents generated by said current generating means; and
stop means coupled to said detector means for stopping the current generation by said current generating means in response to the output signal from said detector means.

### Claim 2 (depends on 1)

An electric surgical knife device according to claim 1, wherein said current generating means comprises signal generating circuits for generating respectively an incision signal, coagulation signal and blend signal; said signal generating circuits being actuated in response to the selection operation of said current selection means; an attenuator connected to the outputs of the signal generating circuits; an amplifier connected to the output of the attenuator; and an output transformer connected to the output of the amplifier.

### Claim 3 (depends on 1, 2)

An electric surgical knife device according to claim 1 or 2, wherein said current selection means comprises a plurality of selection switches; and means for generating a selection signal when one of the selection switches is actuated.

### Claim 4 (depends on 1, 2)

An electric surgical knife device according to claim 1 or 2, wherein said stop means is connected between said current selection means and said current generating means, and comprises means for causing, in response to an output signal from said detector means, said current generating means to stop generating a current.

### Claim 5 (depends on 2)

An electric surgical knife device according to claim 2, wherein said stop means is coupled to the amplifier of said current generating means, and comprises means for causing, in response to an output signal from said detector means, the amplifier of said current generating means to stop producing an output signal.