Heart rate monitoring system for plural persons using radio telemetry

• US 5,157,604 A
• Filed: 01/17/1989
• Issued: 10/20/1992
• Est. Priority Date: 03/07/1988
• Status: Expired due to Fees

• Current Assignee: Majesty The Queen In Right of Canada As Represented By The Minister of National Defence
• Original Assignee: Her Majesty The Queen In Right of Canada As Represented By The Minister of National Defence
• Inventors: Watson, Duane B., Axford, Ivor R.
• Primary Examiner(s): Jablon, Clark A.
• Assistant Examiner(s): Brutman, Laura
• Application Number:
  US07/297,567
• Time in Patent Office: 1,372 Days
• Field of Search: 364/413.03, 364/413.06, 128/696, 128/710, 128/712, 128/903, 434/307, 434/308, 434/319, 455/57, 340/825.08, 340/825.54
• US Class Current: 600/508
• CPC Class Codes: A61B 5/0002 Remote monitoring of patients using telemetry, e.g. transmission of vital signals via a communication network A61B5/07 takes precedence; transmission systems for measured values G08C; transmission H04B; transmission of digital information H04L; wireless communication networks H04W
• CPC Class Codes: G16H 15/00 ICT specially adapted for medical reports, e.g. generation or transmission thereof
• CPC Class Codes: G16H 40/63 for local operation
• CPC Class Codes: G16H 40/67 for remote operation
• CPC Class Codes: G16H 50/30 for calculating health indices; for individual health risk assessment
• CPC Class Codes: Y10S 128/903 Radio telemetry

Abstract

An apparatus for simultaneously monitoring the heart rate of each of a plurality of subjects comprises a main circuit for transmitting a predetermined signal of predetermined frequency and duration and at predetermined time intervals to cause each of a plurality of remote subcircuits to transmit subcircuit identity data and heart rate data in predetermined timed sequence, a receiver for receiving remote subcircuit transmissions and producing an output representative of the heart rate of a subject and a plurality of remote subcircuits, each remote subciruit having a pulse monitoring device adapted to be secured to a subject for detecting and producing an output in response to a heart beat, and a detector for detecting the pulse monitoring device output and determining the number of the outputs which occur within a predetermined time interval, and being responsive to the main circuit predetermined signal for transmitting to the main circuit a signal representative of subcircuit identity data and the number of the detected heart beats.

Claims

1. An apparatus for simultaneously monitoring the heart rate of each of a plurality of subjects, comprising:

a main circuit having;

means for transmitting a predetermined signal of predetermined frequency and duration and at predetermined time intervals to cause each of a plurality of remote subcircuits to transmit subcircuit identity data and heart rate data in predetermined timed sequence;

means for receiving remote subcircuit transmissions and producing an output representative of the heart rate of a subject;

a plurality of remote subcircuits, each said remote

subcircuit having;

pulse monitoring means adapted to be secured to a subject for detecting and producing an output in response to a heart beat;

means for detecting said pulse monitoring means output and determining the number of said outputs which occur within a predetermined time interval;

means responsive to said main circuit predetermined signal for transmitting to said main circuit a signal representative of subcircuit identity data and said number of said detected heart beats.

2. A heart rate monitoring apparatus as defined in claim 1, including computing means to monitor all system functions, a display terminal for displaying outputs from said computing means and printer means for recording outputs from said computing means.

3. A heart rate monitoring apparatus as defined in claim 2, further including a tape cassette player adapted to be controlled by said computing means.

4. A heart rate monitoring apparatus as defined in claim 3, further including a carrying case for said main circuit, said computing means, said display terminal, said printer means and said tape cassette player.

5. A heart rate monitoring apparatus as defined in claim 4, said carrying case further including a tray for storing each said remote subcircuits.

6. A heart rate monitoring apparatus as defined in claim 5, each said remote subcircuits including a rechargeable battery and said carrying case including charging means for charging said rechargeable battery of each said remote subcircuit when stored in said carrying case.

7. A heart rate monitoring apparatus as defined in claim 4, further including speaker means adapted to be connected to the audio output of said tape cassette player and said carrying case including storage compartments for said speaker means.

8. A heart rate monitoring apparatus as defined in claim 1, said main circuit means further including means for generating said predetermined signal and applying said signal to said transmitting means and means for activating said transmitting means at predetermined time intervals.

9. A heart rate monitoring apparatus as defined in claim 8, said activating means including timer means for producing a sync pulse of predetermined duration and a transistor responsive to said sync pulse.

10. A heart rate monitoring apparatus as defined in claim 8, said generating means and said activating means including timer means for producing a sync pulse of predetermined duration.

11. A heart rate monitoring apparatus as defined in claim 10, said predetermined time interval being five seconds.

12. A heart rate monitoring apparatus as defined in claim 8, said predetermined frequency being 2600 hz and said duration being 120 ms.

13. A heart rate monitoring apparatus as defined in claim 1, further including means for decoding the signal received from each said remote subcircuits and for transmitting decoded signals to a computing means adapted to determine the heart rate count of the person connected to said pulse monitoring means and whether said count exceeds a predetermined threshold level.

14. A heart rate monitoring apparatus as defined in claim 13, said decoding means further including:

a buffer for receiving said transmitted signal;

a full wave peak detector/threshold comparator;

a Dual Tone MultiFrequency decoder for detecting a valid dual tone multifrequency tone pair and latching onto the binary value of the tone pair;

timer means for producing a clock signal;

a shift register for receiving serial data in said transmitting signal and responsive to said clock signal for converting said serial data to parallel data; and

interface means for inputting said parallel data into said computing means.

15. A heart rate monitoring apparatus as defined in claim 1, said transmitting means being an FM transceiver.

16. A heart rate monitoring apparatus as defined in claim 1, said representative signal being a dual tone multifrequency signal wherein one portion of said signal being at one frequency and including serial data representative of the identity of the remote subcircuit and another portion of said signal being at another frequency and including serial data representative of the number of tone bursts detected during a predetermined time interval.

17. A heart rate monitoring apparatus as defined in claim 1, each said remote subcircuit further including:

an FM TRANSCEIVER having an FM RECEIVER having a receiver input and a receiver output and an FM TRANSMITTER having a transmitter input and a transmitter output;

a first TONE DECODER adapted to lock onto the output of said pulse monitoring means and produce a predetermined output signal when so locked;

a RIPPLE COUNTER adapted to increment its output in response to each said predetermined TONE DECODER output;

an SHIFT REGISTER connected to and adapted to receive the output of said RIPPLE COUNTER;

a second TONE DECODER connected to said RECEIVER OUTPUT and producing a SYNC PULSE in response to said predetermined signal transmitted by the main circuit;

an OSCILLATOR for producing a clock signal;

a BINARY COUNTER having a clock, a count output, a shift register clock output, an output connected to a RECEIVER input of a transceiver circuit for activating the receiver thereof and monitoring main circuit transmissions and a DTMF output, said BINARY COUNTER being adapted to receive said clock signal from said OSCILLATOR, said SYNC PULSE from said second TONE DECODER, said BINARY COUNTER being inoperative until reset by said SYNC PULSE and, when reset, said BINARY COUNTER being operative to enable said clock, produce a count output, turn OFF said receiver, reset said RIPPLE COUNTER, provide a clock signal to said SHIFT REGISTER and provide, during a first time interval, a first output to a DTMF GENERATOR indicative of a first type of signal to be transmitted and, during a second, immediately following time interval, a second output to said DTMF GENERATOR indicative of a second type of signal to be transmitted;

a DIP SWITCH adapted to provide a subject unit ID CODE;

a MAGNITUDE DETECTOR adapted to receive the count output of said BINARY COUNTER and said ID CODE and produce a CE output when said count output matches said ID CODE; and

a DUAL TONE MULTIFREQUENCY (DTMF) GENERATOR adapted to receive said CE output from said MAGNITUDE DETECTOR, said first and second outputs of said BINARY COUNTER, and said ID CODE from said DIP SWITCH, whereby upon receipt of said CE output and said BINARY COUNTER first output, said GENERATOR being adapted to enable said transmitter and apply to the input thereof a first signal of predetermined frequency and duration representing at least the identity of said remote subcircuit, upon receipt of said BINARY COUNTER second output, said GENERATOR transmitting an output signal of a different frequency and causing said SHIFT REGISTER to transmit its data to said transmitter input.

18. A heart rate monitoring apparatus, comprising:

a main circuit having;

a main circuit TRANSCEIVER including a FM RECEIVER having a receiver input and a receiver output and an FM TRANSMITTER having a transmitter input and a transmitter output;

means for generating and applying to said TRANSMITTER input a predetermined signal of predetermined frequency and duration and at predetermined time intervals, said signal being operative to cause a plurality of remote subcircuits to transmit in predetermined timed sequence identity and heart rate data;

means for activating said TRANSMITTER at predetermined time intervals including a timer means for producing a sync pulse of predetermined duration and a transistor responsive to said sync pulse for enabling said TRANSMITTER;

means for decoding the signal received from each said remote subcircuits and producing a decoded signal; and

computing means adapted to receive said decoded signal from said shift register and provide at least the heart rate count of the person connected to said pulse monitoring means;

a plurality of remote subcircuits, each said remote

subcircuit having;

a subcircuit FM TRANSCEIVER including a RECEIVER having a receiver input and a receiver output and a TRANSMITTER having a transmitter input and a transmitter output;

pulse monitoring means adapted to be secured to a subject for detecting the peak in said subject'"'"'s EKG waveform and, in response to each detected peak, produce a tone burst signal at a predetermined frequency and duration;

means for storing the number of said tone burst signals detected during a predetermined time interval; and

means responsive to receipt of said predetermined signal at said receiver input for applying to said transmitter input and transmitting from said transmitter output to said main circuit means a signal representative of the identity of said remote subcircuit and said number of said tone burst signals.

19. A heart rate monitoring apparatus as defined in claim 18, said decoding means including:

a BUFFER for receiving said transmitting signal;

a FULL WAVE PEAK DETECTOR/THRESHOLD COMPARATOR;

a DUAL TONE MULTIFREQUENCY DECODER for detecting a valid dual tone multifrequency tone pair and latching onto the binary value of the tone pair;

timer means for producing a clock signal; and

a SHIFT REGISTER for receiving serial data in said transmitting signal and responsive to said clock signal for converting said serial data to parallel data.

20. A heart rate monitoring apparatus as defined in claim 19, each said remote subcircuit further including:

a first TONE DECODER adapted to lock onto the output of said pulse monitoring means and produce a predetermined output signal when so locked;

a RIPPLE COUNTER adapted to increment its output in response to each said predetermined TONE DECODER output;

an SHIFT REGISTER connected to and adapted to receive the output of said RIPPLE COUNTER;

a second TONE DECODER connected to said RECEIVER OUTPUT and producing a SYNC PULSE in response to said predetermined signal transmitted by the main circuit;

an OSCILLATOR for producing a clock signal;

a BINARY COUNTER having a clock, a count output, a shift register clock output, an output connected to a RECEIVER input of a transceiver circuit for activating the receiver thereof and monitoring main circuit transmissions and a DTMF output, said BINARY COUNTER being adapted to receive said clock signal from said OSCILLATOR, said SYNC PULSE from said second TONE DECODER, said BINARY COUNTER being inoperative until reset by said SYNC PULSE and, when reset, said BINARY COUNTER being operative to enable said clock, produce a count output, turn OFF said receiver, reset said RIPPLE COUNTER, provide a clock signal to said SHIFT REGISTER and provide, during a first time interval, a first output to a DTMF GENERATOR indicative of a first type of signal to be transmitted and, during a second, immediately following time interval, a second output to said DTMF GENERATOR indicative of a second type of signal to be transmitted;

a DIP SWITCH adapted to provide a subject unit ID CODE;

a MAGNITUDE DETECTOR adapted to receive the count output of said BINARY COUNTER and said ID code and produce a CE output when said count output matches said ID CODE; and

a DUAL TONE MULTIFREQUENCY (DTMF) GENERATOR adapted to receive said CE output from said MAGNITUDE DETECTOR, said first and second outputs of said BINARY COUNTER, and said ID CODE from said DIP SWITCH, whereby upon receipt of said CE output and said BINARY COUNTER first output, said GENERATOR being adapted to enable said transmitter and apply to the input thereof a first signal of predetermined frequency and duration representing at least the identity of said remote subcircuit, upon receipt of said BINARY COUNTER second output, said GENERATOR transmitting an output signal of a different frequency and causing said SHIFT REGISTER to transmit its data to said transmitter input.

21. A heart rate monitoring apparatus as defined in claim 20, said computing means including a display terminal for displaying outputs from said computing means, a keyboard for entering data into said computing means, and printer means for recording outputs from said computing means.

22. A heart rate monitoring apparatus as defined in claim 21, further including a tape cassette player adapted to be controlled by said computing means.

23. A heart rate monitoring apparatus as defined in claim 22, further including a carrying case for main circuit means, said computing means, said display terminal, said printer means and said tape cassette player.

24. A heart rate monitoring apparatus as defined in claim 23, said carrying case further including a tray for storing each said remote subcircuits.

25. A heart rate monitoring apparatus as defined in claim 24, each said remote subcircuits including a rechargeable battery and said carrying case including charging means for charging said rechargeable battery of each said remote subcircuit.

26. A heart rate monitoring apparatus as defined in claim 25, further including speaker means adapted to be connected to the audio output of said tape cassette player and said carrying case including storage compartments for said speaker means.

27. A heart rate monitoring apparatus as defined in claim 18, each said remote subcircuit further including:

a first TONE DECODER adapted to lock onto the output of said pulse monitoring means and produce a predetermined output signal when so locked;

a RIPPLE COUNTER adapted to increment its output in response to each said predetermined TONE DECODER output;

an SHIFT REGISTER connected to and adapted to receive the output of said RIPPLE COUNTER;

a second TONE DECODER connected to said RECEIVER OUTPUT and producing a SYNC PULSE in response to said predetermined signal transmitted by the main circuit;

an OSCILLATOR for producing a clock signal;

a BINARY COUNTER having a clock, a count output, a shift register clock output, an output connected to a RECEIVER input of a transceiver circuit for activating the receiver thereof and monitoring main circuit transmissions and a DTMF output, said BINARY COUNTER being adapted to receive said clock signal from said OSCILLATOR, said SYNC PULSE from said second TONE DECODER, said BINARY COUNTER being inoperative until reset by said SYNC PULSE and, when reset, said BINARY COUNTER being operative to enable said clock, produce a count output, turn OFF said receiver, reset said RIPPLE COUNTER, provide a clock signal to said SHIFT REGISTER and provide, during a first time interval, a first output to a DTMF GENERATOR indicative of a first type of signal to be transmitted and, during a second, immediately following time interval, a second output to said DTMF GENERATOR indicative of a second type of signal to be transmitted;

a DIP SWITCH adapted to provide a subject unit ID CODE;

a MAGNITUDE DETECTOR adapted to receive the count output of said BINARY COUNTER and said ID code and produce a CE output when said count output matches said ID CODE; and

a DUAL TONE MULTIFREQUENCY (DTMF) GENERATOR adapted to receive said CE output from said MAGNITUDE DETECTOR, said first and second outputs of said BINARY COUNTER, and said ID CODE from said DIP SWITCH, whereby upon receipt of said CE output and said BINARY COUNTER first output, said GENERATOR being adapted to enable said transmitter and apply to the input thereof a first signal of predetermined frequency and duration representing at least the identity of said remote subcircuit, upon receipt of said BINARY COUNTER second output, said GENERATOR transmitting an output signal of a different frequency and causing said SHIFT REGISTER to transmit its data to said transmitter input.

28. A heart rate monitoring apparatus as defined in claim 18, further including an audible alarm, said computing means being further adapted to activate said alarm if the heart rate count of a subject exceeds a predetermined threshold level.

29. A kit for use in simultaneously monitoring the heart rate of each of a plurality of subjects, said kit comprising:

a carrying case;

a microcomputer, including a video display screen and keyboard, mounted in said case;

a printer mounted in said case and adapted to be connected to said microcomputer;

a tape cassette player mounted in said case and adapted to be connected to and controlled by said microcomputer;

audio speaker means removably mounted in said case and adapted to be connected to said tape player;

a primary circuit means mounted within said case and electrically connected to said microcomputer and including transmitter and receiver means for receiving and transmitting radio signals, encoding circuitry for generating and transmitting a single predetermined radio signal at predetermined intervals and digital decoding circuitry for decoding received digital signals and imputing said signals into said microcomputer; and

a plurality of participant units adapted to be stored in said case and being removable therefrom for attachment to a test participant, each said participant unit being adapted to be electrically connected to a participant pulse monitoring device and including;

secondary circuit means including circuit means adapted to receive the output of said pulse monitoring device for detecting and storing the number of participant heart beats occurring within a predetermined time interval and for encoding data for transmission to said primary circuit means; and

transmitter and receiver means for receiving said predetermined radio signal transmitted by said primary circuit means and transmitting encoded participant data thereto in a predetermined timed sequence in response to receiving said predetermined radio signal.

30. A kit as defined in claim 29, each said participant unit including a rechargeable battery and said primary circuit means including charging circuit means for selectively charging said batteries when said units are stored in said case. a