Electrosurgical control system using tissue conductivity
Patent 4651280 Issued on March 17, 1987. Estimated Expiration Date: 
December 11, 2005. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
December 11, 2005. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3601126 Electrosurgical unit Safety monitoring circuit for electrosurgical unit Surgical cutting instrument High frequency voltage generator Return electrode monitoring system for use during electrosurgical activation Electrosurgery safety monitor Electrosurgical unit Patent #: 4498475 InventorsApplicationNo. 06/806139 filed on 12/11/1985US Classes:600/372, Structure of body-contacting electrode or electrode inserted in body600/547, Measuring electrical impedance or conductance of body portion606/39, Cutting606/45CuttingExaminersPrimary: Smith, JerryAssistant: Jablon, Clark A. Attorney, Agent or FirmInternational ClassA61B 18/12 (20060101)AbstractA 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..Other References
| |
