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Air emboli detection

  • US 4,280,495 A
  • Filed: 11/24/1978
  • Issued: 07/28/1981
  • Est. Priority Date: 11/24/1978
  • Status: Expired due to Term
First Claim
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1. In apparatus for use in cardiopulmonary bypass surgery or the like and including a blood pump, means coupled to said pump for providing an extracorporeal blood flow path and sensor means disposed adjacent said path for detecting emboli in said path and coupled to said pump for deactivating said pump upon detection of any said emboli, said sensor means comprising a light source and light detection means disposed adjacent to said path and alarm means responsive to light incident upon said detection means from said source for indicating emboli in said path and deactivating said pump, the improvement wherein said sensor means further comprises electrical power supply means for energizing said source only at preselected periodic intervals with said source being otherwise de-energized and gate means electrically connected to said detection means, said power supply means and said alarm means for monitoring said detection means and enabling operation of said alarm means responsive to said detection means only at preselected times corresponding to said preselected periodic intervals.

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