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Ambulatory patient monitoring system

  • US 3,898,984 A
  • Filed: 02/04/1974
  • Issued: 08/12/1975
  • Est. Priority Date: 02/04/1974
  • Status: Expired due to Term
First Claim
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1. A system for automatically monitoring critical body functions of one or more ambulatory patients, the combination of:

  • a. an interrogating and monitoring station operating on a fixed frequency having means for generating and transmitting a plurality of digital coded interrogating signals and having means for receiving and displaying critical body function information received in response to said transmitted signal, b. at least one patient transponder operating at said fixed frequency and having sensing means coupled to the patient for sensing at least one critical body function and being responsive to at least one of said digital coded interrogation signals for transmitting a signal containing said sensed critical body function, said patient transponder including;

    c. a set reset flip-flop circuit having high and low voltage output terminals, set and reset input terminals, d. a delay circuit coupled between said high voltage output terminal and said reset input terminal for providing a reset signal to said reset input after a predetermined time delay, e. means coupled to said set input terminal for causing a high output from said high voltage output terminal, f. means coupled to said sensing means and to said high voltage output terminal for causing the vital body information to be transmitted for the duration of the high output from said high voltage output terminal, g. means coupled to said low voltage output terminal and being responsive to a high output from said low voltage output terminal when said reset signal causes the high output to go low and the low output to go high for generating a trigger signal that will initiate the next sequentially coded signal by said interrogating and monitoring station to be transmitted.

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