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Cardiac monitor with endotracheal sensor

  • US 4,967,759 A
  • Filed: 08/18/1988
  • Issued: 11/06/1990
  • Est. Priority Date: 06/29/1988
  • Status: Expired due to Fees
First Claim
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1. An endotracheal heartbeat monitoring apparatus comprising:

  • a flexible endotracheal tube for insertion through the mouth of a patient, said tube having a proximal end and a distal end;

    means defining a respiratory passage within the endotracheal tube for the control and monitoring of respiration during surgery;

    an inflatable cuff disposed near the distal end of the endotracheal tube, said cuff having proximal and distal ends;

    the proximal and distal ends of the cuff both being sealed to an outer surface of the endotracheal tube;

    said inflatable cuff being of appropriate size when deflated to pass easily through the trachea, and of appropriate size when inflated to contact and conform intimately to the inner wall of the trachea;

    at least one flexible lumen disposed lengthwise along the endotracheal tube from said proximal end thereof to the interior of said inflatable cuff;

    said at least one lumen being disposed external to said endotracheal tube in contacting relation to said endotracheal tube; and

    sound pressure level sensing means within the inflatable cuff for the purpose of sensing changes in the sound pressure level within the cuff, and for producing a signal in response to these changes;

    wherein said sound pressure level sensing means includes transmission means for the purpose of transmitting said signal to a monitoring device external to said apparatus.

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