| 摘要 |
The measuring signal is derived only during the time period of the first steep rise of the blood pressure wave generated by the heart. During the interval up to the next blood pressure wave the signal derivation is blocked. Pref. the signal derivation and signal blocking periods are controlled according to the patient's blood pressure wave. Alternately, the blocking period is preset by a circuit. In order to test the obtained measuring signals for their genuineness the time period of the derived signals is determined electronically and compared with an empirical time range for genuine signals. In this manner the signals with deviating period are filtered out. |
