Electrosurgical control system using tissue conductivity
First Claim
1. A control system in combination with an electrosurgical unit, comprising:
- a means for controlling current flow;
an output electrode and a return electrode;
a means for distinguishing between different tissue types between said output electrode and said return electrode according to an electrical impedance presented by different tissue types betwen said output electrode and said return electrode;
said output electrode being adapted to penetate into tissue;
said means for distinguishing between different tissue types including a means for measuring electrical impedance between said output electrode and said return electrode, and a means for comparing said electrical impedance with predetermined values for said electrical impedance;
said predetermined values corresponding to at least two different impedances; and
said means for comparing producing an output signal based upon comparison of said electrical impedance with said predetermined values of impedance;
said means for measuring including a current sensing mechanism, including a current probe, said current probe being coupled with an output cable of an electrosurgical unit, said current sensing mechanism producing a signal with an amplitude that is proportional to impedances which occur due to different loads between said two electrodes;
whereby penetration of said output electrode into one of said at least two tissue types corresponds to one of said predetermined values of impedance, and penetration of said output electrode into another one of said at least two tissue types corresponds to another one of said predetermined values of impedance.
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Accused Products
Abstract
A Microprocessor controlled Relay is between and in series with the Electro-Surgical Unit and the NiCr loop, to control the output power of the E.S.U. during the operation of Transurethral Resection. The predetermined parameters may input to the Microprocessor for precision control of the E.S.U.. A current probe is connected to the output cable of the E.S.U. to take the variety of the output current of the E.S.U.. The E.S.U. output power will vary according to the variety of the load. By the differences of tissues, the differences of inclusions make the consistency and conductivity vary. The differences of conductivity make the load vary during operating procedure of Transurethral Resection. In other words, the control system can distinguish what tissue is resected according to the variety of the output power of the E.S.U..
203 Citations
6 Claims
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1. A control system in combination with an electrosurgical unit, comprising:
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a means for controlling current flow; an output electrode and a return electrode; a means for distinguishing between different tissue types between said output electrode and said return electrode according to an electrical impedance presented by different tissue types betwen said output electrode and said return electrode; said output electrode being adapted to penetate into tissue; said means for distinguishing between different tissue types including a means for measuring electrical impedance between said output electrode and said return electrode, and a means for comparing said electrical impedance with predetermined values for said electrical impedance;
said predetermined values corresponding to at least two different impedances; andsaid means for comparing producing an output signal based upon comparison of said electrical impedance with said predetermined values of impedance; said means for measuring including a current sensing mechanism, including a current probe, said current probe being coupled with an output cable of an electrosurgical unit, said current sensing mechanism producing a signal with an amplitude that is proportional to impedances which occur due to different loads between said two electrodes; whereby penetration of said output electrode into one of said at least two tissue types corresponds to one of said predetermined values of impedance, and penetration of said output electrode into another one of said at least two tissue types corresponds to another one of said predetermined values of impedance. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification