Device for measuring multiple channels of heartbeat activity and encoding into a form suitable for simultaneous transmission over

• US 4,889,134 A
• Filed: 03/25/1988
• Issued: 12/26/1989
• Est. Priority Date: 03/25/1988
• Status: Expired due to Term

• Current Assignee: Meridian Medical Technologies Incorporated
• Original Assignee: Survival Technology, Inc. (Meridian Medical Technologies Incorporated)
• Inventors: Reinhold, Herbert E. Jr., Greenwold, Douglas J.
• Primary Examiner(s): Jaworski, Francis
• Assistant Examiner(s): Manuel, George
• Application Number:
  US07/172,924
• Time in Patent Office: 641 Days
• Field of Search: 128/696, 128/702, 128/904, 128/710, 128/711, 364/413.05, 364/413.06, 346/33 ME
• US Class Current: 600/509
• CPC Class Codes: A61B 5/0006 ECG or EEG signals
• CPC Class Codes: A61B 5/333 Recording apparatus specially adapted therefor
• CPC Class Codes: Y10S 128/904 Telephone telemetry

Abstract

A device for measuring electrical activity of the heart of a user. The portable device includes structure for receiving at least two leads of electrical activity of the heart of the user. This information is amplified, and coupled to a memory to produce audio signals of a form suitable for transmission over telephone lines in response to input signals. These input signals can be either from the memory or from the output of the amplifier, depending on the mode being commanded. A control structure commands the mode of operation. Live mode allows the acquired input to pass directly to the speaker, to be passed over the telephone lines. Recording mode records the input. Time interval mode records the entire capacity of the memory once. Rolling mode continually acquires and displaces other information that was previously in place. The device plays back a plurality of channels from the memory simultaneously over the telephone line so that these plurality of channels are received by the other end in a synchronized fashion. In addition, the device can operate in either a silent mode, in which information is recorded without any audio information being produced, or a sound mode in which audio information indicative of the information that is being stored is produced.

Claims

1. A portable measuring device for acquiring, storing and transmitting electrical activity of a heart of a user comprising:

connector means for receiving signals indicative of at least two leads of electrical activity of the heart of the user;

means for amplifying said signals to produce at least first and second electrical activity signals from said signals indicative of at least two leads of electrical activity;

memory means, coupled to said amplifying means to receive said first and second electrical activity signals at an input thereof, for storing information indicative of said first and second electrical activity signals;

audio information producing means for selectively producing audio signals of a form suitable for transmission over telephone lines in response to input signals to be transmitted; and

control means for controlling operation of said device, coupled to said memory means and said audio information producing means, comprising;

(a) first means for commanding said device to operate in a live mode by connecting said at least first and second electrical activity signals which are currently being produced by said amplifying means to said audio information producing means as said input signals thereto, so that said audio information producing means produces audio signals indicative of said at least first and second electrical activity signals simultaneously for transmission over said telephone lines;

(b) second means for commanding said memory means to record said first and second electrical activity signals; and

(c) playback command means operating at least in a simultaneous mode for commanding said memory means to play back the stored information thereof in the form of input signals to said audio information producing means such that said audio information producing means produces audio signals indicative of said at least first and second electrical activity signals simultaneously for transmission over said telephone lines.

2. A device as in claim 1 further comprising more than two electrodes, coupled to said connector means, for attaching to said user to measure said electrical activity of said heart thereof.

3. A device as in claim 2 wherein said second means includes means for commanding said memory means into a rolling mode where information is continually being stored in said memory means, new information erasing previous information stored during a previous time interval;

(c) third means for commanding said memory means into a time interval mode to store said at least first and second electrical activity signals for a time interval;

wherein the command of said memory means into said rolling mode by said second means and into said time interval mode by said third means is selectably connected means to respective ones of said electrodes.

4. A device as in claim 3 further comprising a switch within said connector means which is selectively actuated by a connection of said electrodes to said connector means.

5. A device as in claim 3 wherein said control means further comprises means for indicating an abnormal heart activity beginning in a rolling mode, to store a predetermined time before said beginning and a predetermined time after said beginning.

6. A device as in claim 5 wherein said predetermined time after said beginning is selectable by said selectably connected means.

7. A device as in claim 3 further comprising

(d) fourth means for commanding said audio information producing means to be on or off during said time interval mode.

8. A device as in claim 2 wherein there are three electrodes, including two underarm electrodes, and a belt electrode.

9. A device as in claim 2 wherein said amplifying means comprise a plurality of differential amplifiers, coupled to said connector means, each receiving signals from at least two of said electrodes.

10. A device as in claim 1 when said memory means comprises a digital memory,

an analog to digital converter connected to an output of said amplifying means for converting said output of said amplifying means to a digital signal and for providing said signal to said digital memory;

and

a digital to analog converter, connected to an output of said digital memory, for converting said output of said digital memory to an analog signal.

11. A device as in claim 10 wherein said first means includes means for bypassing said analog to digital converter, said memory means and said digital to analog converter.

12. A device as in claim 10 wherein said first means is coupled to said output of said amplifying means and to said audio information producing means and is operable in response to a command signal to command said device to operate in said live mode.

13. A device as in claim 1 wherein said audio information producing means comprises at least one voltage controlled oscillator, receiving the input signals to which said audio information producing means is responsive.

14. A device as in claim 13 wherein said audio information producing means further comprises an audio amplifier and a speaker.

15. A device as in claim 14 wherein each of said at least one voltage controlled oscillator operate at different frequencies, respectively.

16. A device as in claim 1 wherein said play back command means also includes means for operating said memory means in a sequential mode wherein stored information indicative of said at least first electrical activity signal is first played back, followed by stored information indicative of said at least second electrical activity signal being played back.

17. A device as in claim 16 further comprising

timer means, for initiating a timer count upon play back of said memory means stored information indicative of said at least first electrical activity signal or said second electrical activity signal, and erase-after-play means, coupled to said timer means, for commanding said memory means to erase the stored information thereof after said timer count has been completed.

18. A device as in claim 17 wherein said timer means is reset by initiation of another play back command.

19. A device as in claim 18 further comprising a battery for powering said portable apparatus.

20. A device as in claim 19 further comprising a portable housing containing said connector means, said amplifying means, said memory means, said audio information means and said control means.

21. A device as in claim 1 further comprising timer means, for initiating a timer count upon play back of said memory means, and erase-after-play means, coupled to said timer means, for commanding said memory means to erase the stored information thereof after said timer count has been completed.

22. A device as in claim 21 wherein said timer means is reset by initiation of another play back command.

23. A device as in claim 1 wherein said first means is coupled to the output of said amplifying means and to said audio information producing means and is operable in response to a command signal to command said device to operate in said live mode.

24. A portable device for acquiring, storing and transmitting electrical activity of a heart of a user comprising:

connector means for receiving signals indicative of at least two leads of electrical activity of the heart of the user;

means for amplifying said signals to produce at least first and second electrical activity signals from said signals indicative of at least two leads of electrical activity;

memory means, coupled to said amplifying means to receive said first and second electrical activity signals at an input thereof, for storing information indicative of said first and second electrical activity signals;

audio information producing means for selectively producing audio signals of a form suitable for transmission over telephone lines in response to input signals to be transmitted; and

control means for controlling operation of said device coupled to said memory means and said audio information producing means, comprising;

(a) first means for commanding said device to operate in a live mode by connecting said at least first and second electrical activity signals which are currently being produced by said amplifying means to said audio information producing means as said input signals thereto so that said audio information producing means produces audio signals indicative of said at least first and second electrical activity signals simultaneously for transmission over said telephone lines;

(b) second means for commanding said memory means to record information indicative of said at least first and second electrical activity signals;

(c) play back command means for selectively commanding said memory means to play back to stored information thereof in the form of input signals to said audio information producing means, so that said audio information producing means produces audio signals indicative of said played back stored information;

(d) timer means for initiating a timing sequence upon completion of said play back, and continuing said timing as long as another command from said play back command means is not initiated; and

(e) erase-after-play means, coupled to said timer means, for producing a signal commanding erasure of said memory means after said timer reaches a predetermined value.

25. A device as in claim 24 wherein said first means is coupled to the output of said amplifying means and to said audio information producing means and is operable in response to a command signal to command said device to operate in said live mode.

26. A device as in claim 24 wherein said second means commands said memory means into a rolling mode where information is continually being stored in said memory means, new information erasing previous information stored during a previous time interval, and further comprising:

(c) third means for commanding said memory means into a time interval mode to store information indicative of said at least first and second electrical activity signals for a time interval.

27. A device as in claim 24 further comprising

(d) fourth means for commanding said audio information producing means to be on or off during commanding by said third means.

28. A portable measuring device for measuring electrical activity of a heart of a user comprising:

connector means for receiving signals indicative of at least two leads of electrical activity of the heart of the user;

means for amplifying said signals to produce at least first and second electrical activity signals from said signals indicative of at least two leads of electrical activity;

memory means, coupled to said amplifying means to receive said at least first and second electrical activity signals at an input thereof, for storing information indicative of said at least first and second electrical activity signals;

audio information producing means for selectively producing audio signals of a form suitable for transmission over telephone lines in response to input signals to be transmitted; and

control means for controlling operation of said device, coupled to said memory means and said audio information producing means, comprising;

(a) first means for commanding said device to operate in a live mode by connecting said at least first and second electrical activity signals which are currently being produced by said amplifying means to said audio information producing means as said input signals thereto, so that said audio information producing means produces audio signals indicative of said at least first and second electrical activity signals simultaneously for transmission over said telephone lines;

(b) second means for commanding said memory means into a recording mode to record information indicative of said at least first and second electrical activity signals;

(c) third means for commanding said audio information producing means to be on or off during said recording mode; and

(d) playback command means operating at least in a simultaneous mode for commanding said memory means to play back the stored information thereof in the form of input signals to said audio information producing means such that said audio information producing means produces audio signals indicative of said at least first and second electrical activity signals simultaneously for transmission over said telephone lines.

29. A device suitable for use under emergency conditions for acquiring the electrical activity of the heart of a user in a form suitable for transmission over a telephone line comprising

a portable housing,

a pair of electrodes, configured to be placed within the armpits of a user and to be comfortably retained within the armpits by the user so as to acquire the electrical activity of the heart of the user,

a third electrode configured to be placed on the user s skin in the waist area so as to acquire (1) in conjunction with one of said pair of electrodes a second lead of the electrical activity of the heart of the user and (2) in conjunction with the other of said pair of electrodes a third lead of the electrical activity of the heart of the user,

three elongated electrical wires connected with said electrodes and with said portable housing for simultaneously transmitting the three leads of electrical activity of the heart of the user acquired by said electrodes to said portable housing,

sonic speaker means carried by said housing for creating signals indicative of the simultaneous three leads of electrical activity acquired by the electrodes in a form suitable for transmission over a telephonic line,

electric circuit means within said housing for transmitting the simultaneous three leads of electrical activity acquired by said electrodes and transmitted by said three electrical wires to said sonic speaker means so as to create therein signals indicative of the simultaneous three leads of electrical activity acquired by said electrodes for transmission over a telephonic line.