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Heart and breathing alarm monitor

  • US 4,738,264 A
  • Filed: 11/13/1986
  • Issued: 04/19/1988
  • Est. Priority Date: 03/25/1985
  • Status: Expired due to Term
First Claim
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1. An alarm device for detecting abnormal heartbeat and respiration of a person resting on a mattress in a bed, comprisingmeans for detecting vertical movements of the upper surface of the mattress at a location on said mattress remote from said person, said mattress movements occurring at sub-sonic frequencies and being caused by movements of the person'"'"'s body which result from the heartbeat and respiration of the person, said detecting means comprising mechanical/electrical transducer means adapted to rest under the influence of gravity on and in contact with said upper surface for converting said movements of said upper surface to an electrical signal having a frequency dependent upon the heart rate of the person and an envelope dependent upon said respiration;

  • andmeans responsive to said electrical signal for indicating when said heart rate and/or said respiration is outside of a preselected "normal" range whereby the alarm can be placed on top of a mattress supporting a person to pick up vertical vibrations of the mattress due to the person'"'"'s heart and respiratory motions and issue an alarm if the person'"'"'s heart and/or respiration rate is outside of a preselected range.

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