Biomedical response monitor and technique using error correction

• US 5,400,794 A
• Filed: 03/19/1993
• Issued: 03/28/1995
• Est. Priority Date: 03/19/1993
• Status: Expired due to Term

• Current Assignee: Dr. Peter G. Gorman
• Original Assignee: Dr. Peter G. Gorman
• Inventors: Gorman, Peter G.
• Primary Examiner(s): Kamm, William E.
• Application Number:
  US08/033,826
• Time in Patent Office: 739 Days
• Field of Search: 128/696, 128/706, 128/903
• US Class Current: 600/508
• CPC Class Codes: A61B 5/002 Monitoring the patient using a local or closed circuit, e.g. in a room or building A61B5/0017 takes precedence
• CPC Class Codes: A61B 5/0245 by using sensing means generating electric signals, i.e. ECG signals
• CPC Class Codes: A61B 5/222 combined with detection or measurement of physiological parameters, e.g. heart rate
• CPC Class Codes: A61B 5/30 Input circuits therefor
• CPC Class Codes: A61B 5/308 for electrocardiography [ECG]
• CPC Class Codes: Y10S 128/903 Radio telemetry

Abstract

A monitor for measuring and displaying a biomedical response such as heartbeat rate, including a transmitting unit and a receiving unit. The monitor detects the response (heartbeat) and produces a digital pulse train representing this response. The digital pulse train is then encoded to produce an encoded digital signal having a first identification part identifying the transmitting unit and a second data part representing the person'"'"'s response. This encoded digital signal is wirelessly sent to the receiving unit which reads the received signal to determine if it is from the transmitting unit. If it is from that transmitting unit, the data part is read. If there are too many errors in the data part, a new frequency of wireless transmission is used in the monitor. If the errors are within a reasonable bound, the data bits representing the biomedical response are sent to a memory and/or a display. If the received signal were not from the correct transmitting unit, the received signal is rejected. Interference from other monitors or electrical equipment is minimized, and the data displayed is very accurate.

Claims

1. A method for monitoring the heartbeat of a person, comprising the following steps:

obtaining an ECG signal of heartbeat pulses from said person,

amplifying said signal,

digitizing and encoding said amplified signal to produce an encoded digital signal, said encoding of said signal providing a portion for identification purposes and a data portion representing the occurrence of pulses s in said ECG signal,

wirelessly transmitting said encoded digital signal to a display unit,

comparing said transmitting encoded signal with a reference signal to determine if there is a match to the identification portion of said transmitted signal,

comparing the data portion of said transmitted signal with a reference signal to see if there is a match therebetween, and transmitting pulses representing said heartbeat to a display viewable by said person if both the identification portion and the data portion of the received encoded digital signal successfully match a reference signal,

rejecting said transmitted encoded digital signal if there is no match of the identification portion of said transmitted signal, and

changing the frequency of transmission of said encoded digital signal if mismatches in excess of a given number occur when the data portion of said encoded digital signal is compared with the data portion of the reference signal where said changing of frequency reduces the number of said mismatches.

2. The method of claim 1, include the step of changing the frequency over which said encoded digital signals are transmitted in response to the receipt of a frequency change signal from said display unit, said frequency change signal being wirelessly transmitted from said display unit.

3. The method of claim 2, including the further step of storing selected information representing said heartbeat in a memory in said display unit for later display of said selected information.

4. The method of claim 3 including the step of binary encoding said amplifier signal.

5. A method for heartbeat monitoring of a person utilizing a transmitter unit which transmits a person'"'"'s ECG signal to a receiver unit for display to the person of his or her heartbeat including the steps of:

digitizing said ECG signal and encoding it to provide an encoded digital signal having a first part corresponding to identification information and a second part corresponding to said person'"'"'s heartbeat,

wirelessly transmitting said encoded digital signal to said receiver unit,

receiving said encoded digital signal in said receiver unit,

comparing said encoded digital signal with a reference signal to determine if the identification information of said received encoded digital signal matches a reference signal and discarding the received signal if no such match is made,

comparing the data portion of said received signal to a reference signal to determine the accuracy of heartbeat data contained in the received encoded digital signal,

changing the frequency over which wireless transmission occurs if errors exist in the data portion of the received encoded digital signal representing the person'"'"'s heartbeat, said changing of frequency reducing the number of said errors and

displaying the person'"'"'s heartbeat.

6. A heartbeat monitor, including:

a wearable transmitting means for producing an encoded digital signal representative of a person'"'"'s heartbeat, said transmitting means including sensor means for producing an electrical signal representative of a person'"'"'s heartbeat, said transmitter means containing a transmitter for wireless transmission of said encoded digital signal to a display means and

a display means for producing a display of said person'"'"'s heartbeat, said display means including a receiver for receiving said wireless transmission of said encoded digital signal, means for determining if said received encoded signal is from said transmitting unit, means for detecting errors in the received encoded digital signal and means for correcting said errors in said wireless transmission.

7. The monitor of claim 6, where said means for correcting errors includes means for changing the frequency over which said encoded digital signal is transmitted in response to a frequency change signal produced by said display means, said frequency changing reducing the likelihood of errors in said wireless transmission.

8. The monitor of claim 6, where said transmitting means includes means for encoding said electrical signal representative of a person'"'"'s heartbeat to produce said encoded digital signal, said signal including a first part identifying said monitor and a second part which represents the heartbeat of said person.

9. The monitor of claim 8, wherein said means for determining includes means for comparing said received encoded digital signal with a reference signal produced by said display means to determine if said received encoded digital signal has been sent from said transmitting means.

10. The monitor of claim 9, where said means for detecting errors includes means for comparing said received encoded digital signal with a reference signal to determine if said received encoded digital signal has a data part matching the data part of said encoded digital signal transmitted by said transmitting means.

11. A monitor for measuring and displaying a human body condition, comprising:

a transmitter unit capable of being worn by a person to be monitored, said transmitter unit including;

sensor means for detecting a first signal indicative of said human body condition,

means for digitizing said first signal to produce a digital signal representative of said first signal,

encoder means for encoding said digital signal to produce an encoded digital signal, said encoder means including means for producing an identification part unique to said monitor and means for producing a data part representing said human body condition,

transmitting means for transmitting said encoded digital signal via wireless transmission over a selected frequency to a display unit,

a display unit for displaying information received by said display unit, said displayed information being indicative of said human body condition, said display unit including;

receiver means for receiving said encoded digital signal via wireless transmission from said transmitter means,

comparator means for determining if said received encoded digital signal is from said transmitter unit,

comparator means for determining if said data part of said received encoded digital signal matches a predetermined reference pattern produced by said display unit, or if there is a mismatch therebetween,

means for producing a frequency change signal which causes a change in said selected frequency of wireless transmission if said mismatch exists, and

a display means for displaying to said person information representative of said human body response.

12. The monitor of claim 11, where said monitor measures the heartbeat of said person, said display unit including means for removably securing attaching it to a person'"'"'s body.

13. The monitor of claim 11, where said monitor measures the heartbeat of said person, said display unit further including a transmitter means for wirelessly transmitting said frequency change signal to said transmitter unit, said transmitter unit including means for determining if said frequency change signal is from said display unit.

14. The monitor of claim 13, where said means for producing said frequency change signal produces an encoded digital signal having information therein identifying a new selected frequency.

15. The portable monitor of claim 13, where said means for determining if said frequency change signal is from said display unit includes a receiver for receiving said frequency change signal and a comparator for comparing information in said frequency change signal to a reference signal produced by said transmitter unit to determine if there is a match, and means to provide a signal to said transmitting means in said transmitter unit to change said selected frequency if said match is found.

16. A heartbeat monitor, comprising:

a transmitting means for producing an encoded digital signal representative of a person'"'"'s heartbeat, said transmitting means including a transmitter for wireless transmission over a frequency range of said encoded digital signal to a receiving means in a display means,

encoding means for producing said encoded digital signal, said encoded digital signal having a first part identifying said transmitting means and a second part representative of a person'"'"'s heartbeat,

a display means for displaying information representing the person'"'"'s heartbeat,

a receiving means for receiving said encoded digital signal sent via wireless transmission from said transmitting means,

means for determining if said received encoded digital signal is from said transmitting means, and

frequency change means for changing the frequency over which said encoded digital signal is transmitted from said transmitter if errors occur in the data portion of said encoded digital signal received by said receiving means.

17. The heartbeat monitor of claim 16 where said display means include memory means for storing data representative of said heartbeat, for later display to said person.

18. The heartbeat monitor of claim 16, further including means for allowing said person to change the frequency range over which said encoded digital signal is transmitted from said transmitting unit to said display unit.

19. The heartbeat monitor of claim 16, where said frequency change means includes means for wirelessly transmitting a digital frequency change signal from said display means to said transmitting means and further means for producing information in said frequency change signal identifying the display unit from which it is sent.

20. The heartbeat monitor of claim 19, where said frequency change means includes means for producing information in said frequency change signal describing a selected frequency over which said encoded digital signals are to be wirelessly transmitted.

21. A method for heartbeat monitoring of a person using a transmitter means which transmits data representing a person'"'"'s ECG signal to a receiver means for display of the person'"'"'s heartbeat, including the steps of:

digitizing and encoding said ECG signal in said transmitter means to produce an encoded digital signal having a first part corresponding to identification information associating said encoded digital signal with said transmitter means and a second part corresponding to data representing a person'"'"'s heartbeat rate,

wirelessly transmitting over a first frequency said encoded digital signal to said receiver means

reading said identification information in the received encoded digital signal to determine if it is from said transmitter means,

rejecting said received encoded digital signal if it is not from said transmitter means,

reading the data portion of a received encoded digital signal determined to be from said transmitter means to determine said person'"'"'s heartbeat rate,

detecting minor errors in the data portion of said received encoded digital signal,

correcting said minor errors in the data portion of said received encoded digital signal, and

displaying said heartbeat rate.

22. The method of claim 21, further including the step of changing said frequency over which said encoded digital signal is transmitted from said transmitter means to said receiver means if errors exist in the data portion of said received encoded digital signal.

23. The method of claim 22, including the steps of wirelessly transmitting a frequency change signal from said receiver means to said transmitter means to trigger said change of frequency of transmission.

24. The method of claim 23, including the step of producing an identification portion in said frequency change signal which identifies said receiver means.

25. The method of claim 24, including the step of producing a frequency data portion of said frequency change signal which specifies a new frequency over which said wireless transmission will occur.

26. The method of claim 21, including the further step of storing in memory data corresponding to said person'"'"'s heartbeat, for later display.

27. A method for monitoring a human body condition comprising the steps of:

sensing said condition using a sensor located in the area of the body where said condition occurs,

producing an electrical signal representative of said condition,

digitizing said electrical signal to produce a digital signal,

encoding said digital signal to produce an encoded digital signal representative of said human body condition,

wirelessly transmitting said encoded data signal over a first transmission frequency,

receiving said encoded digital signal,

reading said received encoded digital signal to determine if there is an error therein,

producing a frequency change signal if said error is found,

changing the transmission frequency to a second value in response to said frequency change signal, and

displaying said human body condition to said person.

28. The method of claim 27, including the step of producing an identification portion in said encoded data signal, said identification portion being read in said reading step.

29. The method of claim 28, including the step of producing a data portion representing said human body condition in said encoded data signal.

30. The method of claim 27, including the step of storing said received encoded digital signal.

31. The method of claim 27, where said sensing step senses said person'"'"'s heartbeat.

32. A heartbeat monitor, comprising in combination

a transmitting means for producing an encoded digital signal representative of a person'"'"'s heartbeat, said transmitting means including a transmitter for wirelessly transmitting said encoded digital signal over a first frequency to a display means,

a display means including a receiver for receiving said encoded digital signal, error detection means for detecting an error in the signal received by said receiver, decoding means for decoding said encoded digital signal received by said receiver, a display for displaying said person'"'"'s heartbeat, and

frequency change means for automatically changing said first frequency over which said encoded digital signal is transmitted if said error is detected.

33. The monitor of claim 32, where said frequency change means includes means for wirelessly transmitting a frequency change signal from said display means to said transmitting means when said specified error is determined.

34. The monitor of claim 33, further including means for enabling said transmitting means to know that said frequency change signal is from said display means.

35. The monitor of claim 34, where said frequency change means includes further means for selecting the frequency over which said encoded digital signal is wirelessly transmitted.

36. The monitor of claim 32, further including means for correcting errors in the received encoded digital signal, without an automatic change of frequency.

37. A monitor for measuring and displaying a biomedical condition including:

a transmitting means including encoding means for producing an encoded digital signal representative of said biomedical condition, said transmitting means including a transmitter for wirelessly transmitting said encoded digital signal to a receiver over a first frequency,

a receiver for receiving said encoded digital signal,

a display means for displaying said biomedical condition,

detection means for detecting errors in said received encoded digital signal, and

correction means for automatically changing said transmitter and said receiver to provide accurate wireless transmission therebetween.

38. The monitor of claim 37, where said correction means includes frequency change means for changing said first frequency over which said encoded digital signal is wirelessly transmitted.

39. The monitor of claim 38, where said correction means includes means for producing a frequency change signal, means for wirelessly transmitting said frequency change signal to said transmitting means, and means for encoding said frequency change signal to produce a portion thereof which identifies its source.

40. The monitor of claim 37, including identification means for determining that the encoded digital signal received by said receiver is from said transmitter.

41. The monitor of claim 37, where said transmitting unit produces an encoded digital signal representation of a heartbeat.

42. The monitor of claim 41, where said monitor includes means for electrically powering it by a battery.

43. The monitor of claim 37, where said transmitting means and said display means include means for removably securing said transmitting means and said display means to said person.

44. The monitor of claim 37, where said monitor includes means for electrically powering said monitor by a battery.

45. The monitor of claim 37, further including an exercise means for enabling a person to exercise, said display means being located on said exercise means for direct viewing by said person.