发明授权
- 专利标题: Method for calculating transducer capacitance to determine transducer temperature
- 专利标题(中): 计算换能器电容以确定换能器温度的方法
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申请号: US09975390申请日: 2001-10-10
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公开(公告)号: US07077853B2公开(公告)日: 2006-07-18
- 发明人: Kenneth S. Kramer , Eitan T. Wiener , William T. Donofrio , Kevin Houser , Foster B. Stulen
- 申请人: Kenneth S. Kramer , Eitan T. Wiener , William T. Donofrio , Kevin Houser , Foster B. Stulen
- 申请人地址: US OH Cincinnati
- 专利权人: Ethicon Endo-Surgery, Inc.
- 当前专利权人: Ethicon Endo-Surgery, Inc.
- 当前专利权人地址: US OH Cincinnati
- 代理商 Verne E. Kreger, Jr.
- 主分类号: A61B17/32
- IPC分类号: A61B17/32
摘要:
A method for calculating the capacitance of a transducer (C0) without knowing the exact resonance frequency of a transducer/blade combination is achieved by sweeping across a broad frequency range which contains resonant and non-resonant frequencies where C0 can be measured. A pre-defined frequency range is set independently of the resonance frequency of a specific transducer/blade combination. C0 of the transducer/blade is measured at several different frequencies within the pre-defined frequency range to ensure that invalid C0 measurements are disregarded, and the temperature of the transducer is calculated based on valid C0 measurements. The determined transducer temperature, based on C0 measurements, can be used to optimize performance and/or provide a safety shutdown mechanism for the generator.
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