GB1257114A - - Google Patents

Abstract

1,257,114. Electro-medical apparatus. E. R. JOHN and R. LAUPHEIMER. Nov. 25, 1969 [Dec.11, 1968], No.57572/69. Heading G1N. In an instrument for detecting life in a patient, the signals from an EKG and from an EEG are monitored. As shown, the EEG provides evoked response signals due to visual, audio and shock stimulators 42, 43, 44 to a data scan 14 which sequentially applies the signals via an amplifier 19 to a data scan 21 and a data scan 60. The EKG also applies its amplified output signal to the data scans 21 and 60. The data scan 21 sequentially applies its inputs to an analogue-todigital converter 31 and an average response computer 33 which averages out background noise and applies its output to the data scan 60. A clock and cycle control 36 controls each of the data scan sequences and a time stamp 61 which stamps the time on the recording paper of a graphic recorder 23 whose single pen is controlled by the signals from data scan 60. In this manner a record may be produced as shown in Fig. 3. The clock and cycle control 36 also applies a calibration pulse over lines 50-52 to test the apparatus. In any of the integrated EKG, EEG, and averaged signals fall below a pre-set threshold an alarm 59 is activated. In an alternative, Fig. 2 (not shown), the analogue signals from data scan 21 are not digitized and an analogue average response computer is then utilised. Further, the data scan 60 is omitted and the graphic recorder has three channels to record simultaneously the EKG, EEG, and averaged signals, Fig. 4 (not shown). The embodiment of Fig. 1 may be provided with the graphic recorder of Fig. 2 and vice versa.