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Cardiac monitor wristwatch

  • US 4,086,916 A
  • Filed: 09/19/1975
  • Issued: 05/02/1978
  • Est. Priority Date: 09/19/1975
  • Status: Expired due to Term
First Claim
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1. In an electronic wristwatch which includes a face portion having timing circuitry mounted therein which includes a digital readout of time, and a wrist strap portion for securing said face portion about the wrist of the wearer, a cardiac monitoring improvement thereto which comprises:

  • means mounted in said wrist strap portion for transmitting a signal towards the radial artery of the wearer and means mounted in said wrist strap portion for receiving the signal reflected therefrom;

    means mounted in said wrist strap portion which is responsive to said transmitted and received signals for producing an analog signal proportional to the relative movement of said artery;

    means mounted in said face portion for converting said analog signal to a digital signal indicative of the pulse rate of the wearer; and

    means connected to said timing circuitry of said electronic wristwatch for selectively displaying said pulse rate on said digital readout;

    wherein said transmitting means and said receiving means each comprise an ultrasonic transducer;

    wherein said transmitting means further comprises a crystal-controlled oscillator for driving the transmitting ultrasonic transducer; and

    further comprising amplifier means connected between said oscillator and said transmitting ultrasonic transducer for matching the respective impedances thereof.

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