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Alarm actuation arrangement for an automatic blood pressure recorder

  • US 4,050,452 A
  • Filed: 04/21/1976
  • Issued: 09/27/1977
  • Est. Priority Date: 09/26/1975
  • Status: Expired due to Term
First Claim
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1. In an apparatus for automatically detecting and recording a succession of time-spaced blood flow surges occurring while a variable external pressure applied to a patient'"'"'s artery is decreased over a first range including the systolic to diastolic pressure range of the patient, the apparatus comprising an inflatable cuff for applying the external pressure to the artery, means for pressurizing the cuff to a first predetermined value corresponding to the upper end of the first range, means operative when the cuff has reached the first value for depressurizing the cuff, and means for detecting successive blood flow surges caused by successive movements of the artery as the cuff is depressurized the improvement comprising an arrangement for actuating an alarm means if the first blood pressure surge during said depressurization does not occur within a prescribed interval commencing a fixed time after the start of depressurization of the cuff, when said depressurization proceeds at a substantially linear rate, the prescribed interval being indicative of an acceptable range of systolic pressures, the arrangement comprising, in combination, means coupled to the detecting means for generating an indicating pulse upon the occurrence of the first blood flow surge, normally enabled gating means interconnecting the output of the indicating pulse generating means and the alarm means for normally operating the alarm means upon the occurrence of the indicating pulse, means rendered effective upon the start of depressurization of the cuff for generating an auxiliary pulse having a duration equal to the prescribed interval, means for delaying the auxiliary pulse by the fixed time, and means applying the delayed auxiliary pulse to the gating means for disabling the gating means for the duration of the auxiliary pulse.

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