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Warning apparatus for indicating a threat of impending shock

  • US 4,013,067 A
  • Filed: 05/22/1975
  • Issued: 03/22/1977
  • Est. Priority Date: 06/26/1974
  • Status: Expired due to Term
First Claim
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1. In a warning apparatus for indicating the threat of impending shock in a patient, including photoelectric pulse pickup means adapted to be applied to the skin of said patient and comprising at least one light transmitter and at least two light receivers, said light transmitter comprising substantially a light source, said light receivers converting incident light into corresponding electrical signals, said receivers comprising combined reflection and transmission receivers;

  • signal comparison means having at least one threshold discriminator set to predetermined critical threshold values corresponding to upper and lower boundary values and being operatively connected to said pulse pickup means for comparing simultaneously signals obtained from a reflection and transmission measurement with said boundary values and to generate an output signal; and

    alarm means responsive to said output signal for initiating an alarm when the signals compared by said comparison means with said boundary values exceed or fall below said boundary values, said signals from said pickup means comprising simultaneous transmissive and reflective signals dependent on the physiological characteristics of a patient related to impending shock conditions.

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