| 摘要 |
A power supply apparatus for operation for outputting power to a surgical instrument includes an impedance detection section for detecting the impedance of the surgical instrument in the output, and an abnormality detection section for detecting an abnormality according to whether or not a variation value of the impedance per unit time exceeds a predetermined first impedance variation value. The abnormality detection section further detects an abnormality according to whether or not a variation value of a resonant frequency per unit time exceeds a predetermined threshold. The abnormality is detected in this manner, whereby it is possible to prevent the surgical instrument from being broken.
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