Twelve-lead portable heart monitor and method

• US 5,339,823 A
• Filed: 08/07/1992
• Issued: 08/23/1994
• Est. Priority Date: 08/07/1992
• 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.
• Primary Examiner(s): Cohen, Lee S.
• Assistant Examiner(s): Jastrzab, Jeffrey R.
• Application Number:
  US07/925,912
• Time in Patent Office: 746 Days
• Field of Search: 128/710, 128/696, 128/639, 128/640, 128/644, 128/904
• US Class Current: 600/523
• CPC Class Codes: A61B 5/0006 ECG or EEG signals
• CPC Class Codes: A61B 5/282 Holders for multiple electrodes for introduction into the body A61B5/287
• CPC Class Codes: A61B 5/332 Portable devices specially adapted therefor
• CPC Class Codes: Y10S 128/904 Telephone telemetry

Abstract

A method and device for obtaining electrical heart activity of an individual in a form capable of producing a twelve-lead electrocardiogram of an individual. The device includes a portable electrode support having an array of six non-adhesive precordial electrodes fixed thereon at predetermined positions within the array which correspond with the Wilson precordial leads for the individual. The device also includes a right arm electrode, a left arm electrode, a left leg electrode and circuitry for converting the electrical heart activity of the individual obtained by said electrodes into a form capable of producing a twelve-lead electrocardiogram. The method includes the steps of applying the left leg, left arm and right arm electrode to the skin of the individual at locations such that the circuitry can be electrically operable to obtain leads I, II, III, AVR, AVL, and AVF therefrom. Human pressure is applied to engage the array of six precordial electrodes with the skin of the chest of the individual in an operative relation, and circuitry is operated for a time sufficient to obtain electrical heart activity of the individual in a form capable of producing an electrocardiogram.

Claims

1. A method of obtaining electrical heart activity of an individual in a form capable of producing a twelve-lead electrocardiogram of an individual with the use of a device including a portable electrode support having an array of six non-adhesive precordial electrodes fixed thereon at predetermined positions within the array which correspond with the Wilson precordial leads for the individual, a right arm electrode, a left arm electrode, a left leg electrode and circuitry for converting the electrical heart activity of the individual obtained by said electrodes into a form capable of producing a twelve-lead electrocardiogram, the method comprising

applying the right arm electrode, the left arm electrode and the left leg electrode the skin of the individual at locations such that the circuitry can be electrically operable to obtain respective leads I, II, III, AVR, AVL, and AVF therefrom,

utilizing an arm of the individual including at least the forearm and upper arm to engage the array of six precordial electrodes with the skin of the chest of the individual in an operative relation such that the circuitry can be electrically operable to obtain leads V₁, V₂, V₃, V₄, V₅, and V₆ therefrom, and

operating the circuitry of said device for a time sufficient to obtain electrical heart activity of the individual in a form capable of producing an electrocardiogram representative of leads I, II, III, AVR, AVL, AVF, V₁, V₂, V₃, V₄, V₅, and V₆, while said six precordial electrodes are retained in skin-engagement by applying human pressure to the support sufficient to retain said operative relation and while said left arm electrode, said right arm electrode and said left leg electrode are applied as aforesaid.

2. A method as called for in claim 1, further utilizing the wrist and hand of said arm of the individual engage the array of six precordial electrodes with the skin of the chest.

3. A method as called for in claim 2 wherein pressure is applied to the support by utilizing the left arm, including the left wrist, left forearm and left hand of the individual to retain said array of six precordial electrodes in said skin-engagement with the chest.

4. A method as called for in claim 3 wherein the left arm electrode is a non-adhesive electrode and is fixed to said support on a location thereof where pressure is applied by the individual and wherein the left arm electrode is applied by engaging the same with the skin of the individual applying pressure on the support in an operative relation and retaining the left hand electrode in said operative relation by the pressure of the individual on the support.

5. A method as called for in claim 4 wherein the left leg electrode is a non-adhesive electrode and is applied by engaging the left leg electrode to the skin of the waist of the individual in an operative relation and retaining the left leg electrode in said operative relation by pressure applied exteriorly thereto.

6. A method as called for in claim 5 wherein exterior pressure is applied to said left leg electrode by a garment worn by the individual around the waist.

7. A method as called for in claim 5 wherein the right arm electrode is a non-adhesive electrode with the skin of the right armpit of the individual in an operative relation and retaining the right arm electrode in said operative relation by the individual applying pressure thereto with the right arm.

8. A method of producing a twelve-lead electrocardiogram of an individual with the use of a device including a portable electrode support having an array of six non-adhesive precordial electrodes fixed thereon at predetermined positions within the array which correspond with the Wilson precordial leads for the individual a right arm electrode, a left arm electrode, a left leg electrode and circuitry for converting the electrical heart activity data of the individual obtained by said electrodes into a form capable of producing a twelve-lead electrocardiogram, the method comprising

applying the right arm electrode, the left arm electrode and the left leg electrode to the skin of the individual at locations such that the circuitry can be electrically operable to obtain leads I, II, III, AVR, AVL, and AVF therefrom,

utilizing an arm of the individual including at least the forearm and upper arm to engage the array of six precordial electrodes with the skin of the chest of the individual in an operative relation such that the circuitry can be electrically operable to obtain leads V₁, V₂, V₃, V₄, V₅, and V₆ therefrom,

operating the circuitry of said device for a time sufficient to obtain electrical heart activity of the individual in a form capable of producing an electrocardiogram representative of leads I, II, III, AVR, AVL, AVF, V₁, V₂, V₃, V₄, V₅, and V₆, while said six precordial electrodes are retained in skin-engagement by applying human pressure to the support sufficient to retain said operative relation and while said left arm electrode, said right arm electrode and said left leg electrode ar applied as aforesaid, and

utilizing the obtained electrical heart activity of the individual to produce a twelve-lead electrocardiogram.

9. A method as called for in claim 8 wherein the procedure for producing the twelve-lead electrocardiogram includes converting the obtained electrical heart activity of the individual within said circuitry into audible signals indicative of the electrical heart activity of the individual, transmitting the audible signals over a telephone communication line to a remote location and utilizing the audible signals communicated over the telephone line to the remote location to produce said electrocardiogram by a strip chart recorder.

10. A method as called for in claim 8 wherein said electrocardiogram is produced by generating an electrical signal to a strip chart recorder carried by the support of the device.

11. A method as called for in claim 8 further comprising the steps of storing the obtained electrical heart activity of the individual in a memory in said circuitry and using said memory to produce said twelve-lead electrocardiogram by a strip chart recorder.

12. A method as called for in claim 8, utilizing the wrist and hand of said arm of the individual engage the array of six precordial electrodes with the skin of the chest.

13. An apparatus for obtaining electrical heart activity of an individual in a form capable of producing a twelve-lead electrocardiogram of an individual, said apparatus including

an array of six non-adhesive precordial electrodes,

support means for supporting said array of six non-adhesive precordial electrodes at predetermined positions within the array which correspond with Wilson precordial leads for the individual, said precordial electrodes each having an operative surface thereof generally facing in a first direction with respect to said supporting means,

a right arm electrode,

a left arm electrode,

a left leg electrode, and

circuitry means carried by said supporting means in electrically connected relation to said electrodes for converting the electrical heart activity of the individual obtained by said electrodes into a form capable of producing a twelve-lead electrocardiogram,

said right arm electrode, said left arm electrode, and said left leg electrode being constructed so as to be operable to be applied to the skin of the individual at locations such that the circuitry means can be electrically operable to obtain leads I, II, III, AVR, AVL, and AVF therefrom,

said supporting means presenting an exterior surface generally facing in a direction opposite to said first direction and adapted to have human pressure applied thereto, said supporting means being constructed and arranged in a manner which enables it to be manually held and moved towards the chest of the individual to engage said operative surface of said precordial electrodes with the skin of the chest, said apparatus requiring application of human pressure to said exterior surface transmitted through said supporting means to said precordial electrodes to retain said precordial electrodes in operative relation with the skin of the chest, and

control means for operating said circuitry means while said six precordial electrodes are retained in said operative relation as aforesaid and said left arm electrode, said right arm electrode and said left leg electrode are applied as aforesaid, for a time sufficient to obtain electrical heart activity of the individual in a form capable of producing an electrocardiogram representative of leads I, II, III, AVR, AVL, AVF, V₁, V₂, V₃, V₄, V₅, and V₆.

14. An apparatus as called for in claim 13 wherein said supporting means is of a size and shape to extend throughout the chest area containing the six Wilson precordial leads of the individual and to have the pressure applied by the individual to the support means by the left arm and left hand, said supporting means having an operatively interior surface on which said six precordial electrodes are fixed.

15. An apparatus as called for in claim 14 wherein said left arm electrode is non-adhesive and is fixed to the exterior surface of said supporting means at the location thereof where pressure is applied to the supporting means by the individual so as to enable the left arm electrode to be applied to the individual by engagement by the skin of the individual in an operative relation and retention of the operative relation by the pressure applied to the supporting means by the individual.

16. An apparatus as called for in claim 15 wherein said supporting means includes a hollow housing within which said circuitry means is mounted.

17. An apparatus as called for in claim 16 wherein said hollow housing is rigid and of a size and shape to extend throughout the chest area containing the six Wilson precordial leads of the individual.

18. An apparatus as called for in claim 16 wherein said hollow housing is rigid and of a size and shape to receive a first plurality of said six precordial electrodes, said supporting means also including a flexible pad-like section connected therewith of a size to receive the remaining plurality of said six precordial electrodes, said flexible pad-like section being connected for movement between a storage position wherein the flexible pad section is wrapped around the hollow housing to enter therewith within a storage pouch and an operative position extending from said hollow housing so that when the first plurality of electrodes fixed to said hollow housing are retained in operative relation by pressure on said hollow housing from the left hand of the individual, the left arm of the individual can apply pressure to the flexible pad-like section to retain the remaining plurality of electrodes fixed thereto in operative relation.

19. An apparatus as called for in claim 16 wherein said right arm electrode is of a non-adhesive material connected with said circuitry means by a wire and is of a size and shape to be conveniently engaged with the skin to the right armpit of the individual in an operative relation and to be conveniently retained in said operative relation by pressure from the right arm of the individual.

20. An apparatus as called for in claim 19 wherein said left leg electrode is of a non-adhesive material connected with said circuitry means by a wire and is of a size and shape to be conveniently engaged with the skin of the waist of the individual in an operative position and retained in said operative relation by a garment extending around the waist of the individual.

21. An apparatus as called for in claim 16 wherein said circuitry means includes a loud speaker and is operable to convert the obtained electrical heart activity of the individual into audible signals emitted by said loudspeaker.

22. An apparatus as called for in claim 16 wherein said housing contains a strip chart recorder for producing the twelve-lead electrocardiogram from the obtained electrical heart activity of the individual.

23. An apparatus as called for in claim 16 wherein said circuitry means includes a memory within which the obtained electrical heart activity of the individual is stored.

24. An apparatus as called for in claim 16 wherein said supporting means has breast bone locating indicia thereon enabling the individual to locate the supporting means in an operative position with respect to the breast bone of the individual for determining the horizontal position of the operative relation of said six precordial electrodes.

25. An apparatus as called for in claim 24 wherein said support means has a lanyard connected therewith for extension around the neck of the individual, said lanyard having a portion thereof with a length defining the vertical position of the operative relation of said six precordial electrodes.

26. An apparatus as called for in claim 13 wherein said right arm electrode is of a non-adhesive material connected with said circuitry means by a wire and is of a size and shape to be conveniently engaged with the skin to the right armpit of the individual in an operative position and to be conveniently retained in said operative relation by pressure from the right arm of the individual.

27. An apparatus as called for in claim 13 wherein said left leg electrode is of a non-adhesive material connected with said circuitry means by a wire and is of a size and shape to be conveniently engaged with the skin of the waist of the individual in an operative position and retained in said operative relation by a garment extending around the waist of the individual.

28. An apparatus as called for in claim 13 wherein said circuitry means includes a loud speaker and is operable to convert the obtained electrical heart activity into audible signals emitted by said loudspeaker.

29. An apparatus as called for in claim 16 wherein said housing contains a strip chart recorder for producing the twelve-lead electrocardiogram from the obtained electrical heart activity of the individual.

30. An apparatus as called for in claim 13 wherein said circuitry means includes a memory within which the obtained electrical heart activity of the individual.

31. An apparatus as called for in claim 13 wherein said support means has breast bone locating indicia thereon enabling the individual to locate the supporting means in an operative position with respect to the breast bone of the individual for determining the horizontal position of the operative relation of said six precordial electrodes.

32. An apparatus as called for in claim 13 wherein said supporting means has a lanyard connected therewith for extension around the neck of the individual, said lanyard having a portion thereof with a length defining the vertical position of the operative relation of said six precordial electrodes.

33. An apparatus as called for in claim 13 wherein said left arm electrode is fixed to said supporting means in a position to be engaged with the skin of the palm of the left hand of the individual in said operative relation and retained in said operative relation by pressure applied to the supporting means by the left hand of the individual.