Electric operation apparatus
First Claim
1. An electric operation apparatus comprising:
- a high-frequency current generating means for delivering high-frequency output power with which high-frequency current is conducted to a living tissue for the purpose of remedy;
an output changing means for changing high-frequency output power that is delivered by said high-frequency current generating means; and
a control means for controlling the output changing means so that high-frequency output power is delivered intermittently to said tissue over a plurality of time intervals (n), said control means calculating a change in the impedance (Δ
Zn) offered by a living tissue during each application delivery interval n, and comparing a value Δ
Zn/Zsn, where Zsn is a measured tissue impedance offered at the start of the nth delivery interval, against a predetermined value implying completion of coagulation change, wherein if Δ
Zn/ZSn meets a completion condition, the control circuit stops repetition of continuation and discontinuation of output power delivery, wherein after a first time interval, each successive power delivery interval is of equal to or a shorter time duration than an immediate prior interval to enable tissue coverage over a wide range.
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Accused Products
Abstract
When a user steps on a footswitch, high-frequency output power is delivered. A control circuit included in a diathermic power supply calculates the impedance ZSn that is offered by a living tissue immediately after delivery of high-frequency output power is started during the n-th delivery period. The control circuit also calculates the impedance ZEn that is offered thereby immediately before delivery of high-frequency output power is discontinued with elapse of predetermined time. The control circuit then discontinues delivery of high-frequency output power for the predetermined time, and calculates a difference ΔZn between the impedances. When the difference meets a predetermined condition that implies coagulation or when the number of times of delivery reaches a predetermined value, the control circuit discontinues delivery of high-frequency output power.
136 Citations
28 Claims
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1. An electric operation apparatus comprising:
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a high-frequency current generating means for delivering high-frequency output power with which high-frequency current is conducted to a living tissue for the purpose of remedy; an output changing means for changing high-frequency output power that is delivered by said high-frequency current generating means; and a control means for controlling the output changing means so that high-frequency output power is delivered intermittently to said tissue over a plurality of time intervals (n), said control means calculating a change in the impedance (Δ
Zn) offered by a living tissue during each application delivery interval n, and comparing a value Δ
Zn/Zsn, where Zsn is a measured tissue impedance offered at the start of the nth delivery interval, against a predetermined value implying completion of coagulation change, wherein if Δ
Zn/ZSn meets a completion condition, the control circuit stops repetition of continuation and discontinuation of output power delivery, wherein after a first time interval, each successive power delivery interval is of equal to or a shorter time duration than an immediate prior interval to enable tissue coverage over a wide range. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. An electric operation apparatus comprising:
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a high-frequency current generating means for delivering high-frequency output power with which high-frequency current is conducted to a living tissue for the purpose of remedy; an output changing means for changing high-frequency output power between first and second levels that is delivered by said high-frequency current generating means; and a control means for controlling said output changing means so that high-frequency output power of the first level and high-frequency output power of the second level different from the first level will be delivered alternately to said tissue over a plurality of time intervals (n), said control means calculating a difference in the current value (Δ
I) conducted by a living tissue between the initial current value (IS) conducted by a living tissue during each application of output power at the second level with the final current value IE conducted by said living tissue during an immediately preceding delivery period of the output power of the second level, and comparing a value Δ
I/IS against a predetermined value implying completion of coagulation change, wherein if Δ
I/IS meets a completion condition, the control circuit stops said alternate delivery of high-frequency output power at the first and second levels, wherein after a first time interval, each successive interval is of equal to or a shorter time duration than an immediate prior interval to enable tissue coverage over a wide range. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28)
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Specification