CA1082316A - Electrode system for acquiring electrical signals from the heart - Google Patents
Electrode system for acquiring electrical signals from the heartInfo
- Publication number
- CA1082316A CA1082316A CA285,404A CA285404A CA1082316A CA 1082316 A CA1082316 A CA 1082316A CA 285404 A CA285404 A CA 285404A CA 1082316 A CA1082316 A CA 1082316A
- Authority
- CA
- Canada
- Prior art keywords
- electrode
- heart
- sensing
- electrical
- wrist
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/24—Detecting, measuring or recording bioelectric or biomagnetic signals of the body or parts thereof
- A61B5/316—Modalities, i.e. specific diagnostic methods
- A61B5/318—Heart-related electrical modalities, e.g. electrocardiography [ECG]
- A61B5/332—Portable devices specially adapted therefor
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/02—Detecting, measuring or recording pulse, heart rate, blood pressure or blood flow; Combined pulse/heart-rate/blood pressure determination; Evaluating a cardiovascular condition not otherwise provided for, e.g. using combinations of techniques provided for in this group with electrocardiography or electroauscultation; Heart catheters for measuring blood pressure
- A61B5/024—Detecting, measuring or recording pulse rate or heart rate
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/02—Detecting, measuring or recording pulse, heart rate, blood pressure or blood flow; Combined pulse/heart-rate/blood pressure determination; Evaluating a cardiovascular condition not otherwise provided for, e.g. using combinations of techniques provided for in this group with electrocardiography or electroauscultation; Heart catheters for measuring blood pressure
- A61B5/024—Detecting, measuring or recording pulse rate or heart rate
- A61B5/02438—Detecting, measuring or recording pulse rate or heart rate with portable devices, e.g. worn by the patient
Abstract
ELECTRODE SYSTEM FOR ACQUIRING
ELECTRICAL SIGNALS FROM THE HEART
Abstract A wristband having inner and outer sensing electrodes capable of acquiring signals from bipolar limb leads and being electrically associated with electronics capable of processing such signals in a form representative of the electrical activity of the heart. The inner electrode is in continual electrical contact with the skin of the wrist upon which the band is worn. The outer electrode is isolated from the inner electrode and includes an outer portion exposed for contact by the fingers of the wearer's opposite hand. When such finger contact with the outer electrode is made, the bipolar circuit is completed and the ECG skin potential signals are sensed at the electrodes. The signals are processed to produce a digital indication of heartbeat rate, or other signal representative of heart activity.
ELECTRICAL SIGNALS FROM THE HEART
Abstract A wristband having inner and outer sensing electrodes capable of acquiring signals from bipolar limb leads and being electrically associated with electronics capable of processing such signals in a form representative of the electrical activity of the heart. The inner electrode is in continual electrical contact with the skin of the wrist upon which the band is worn. The outer electrode is isolated from the inner electrode and includes an outer portion exposed for contact by the fingers of the wearer's opposite hand. When such finger contact with the outer electrode is made, the bipolar circuit is completed and the ECG skin potential signals are sensed at the electrodes. The signals are processed to produce a digital indication of heartbeat rate, or other signal representative of heart activity.
Description
3~6 Backqround .
Many biologic, especially electrical, parameters are measured by the difEerence in electrical po-tential across specific organs or organ systems. Specifically, electrocardiograms (ECG) and other electrical parameters of cardiac activity require two or more electrodes or sensing devices placed so that they are on each side of the ` electrical axis of the heart. The basic arrangement, known as Lead I, consists of strapping an electrode to each wrist so as to measure the electrical potential difEerence lO across the heart. While such an arrangement is perfectly acceptable for clinical testing, it is inconvenient and impractical, if not impossible, in other circumstances such as during routine exercise programs.
A yrowing number of individuals are performing exercise proyrams regularly or in-termittently. It is generally acknowledged that the heart rate is the ~est indicator of the value of such exercise to the cardiovascular systemj i.e., when enough effort is expended to be useful and when so much effort is expended as to be danyerous~
20 Thus, as reported in ~. R. Zohman, Exercise Your Weiyht to .. , ~ .
i Fitness and Heart Health, 16-18 (CPC Internat.ional, 1974), .. : . :, it is important in an e~fective exercise training proyram that there be a gradual increase in heart rate until a target xate of 70 to 85 percent of the maximum attainable rate (depending on age and physical condition) is achieved.
A period of 20 to 30 minutes of exercise at the target level will then provide a significant conditioniny effect on the cardiovascular system. While the average taryet zones for different aye groups are readily available ~for an average !
30 40-year old male it is, for example, 128 to 155 beats per minute), it is apparent tha-t most individuals lack the skill ,~, :`
; 2 D~
~(~823~L6 or inclina tion to tak~ their own pulse at various intervals durincJ the exerclse period to ascertain whether their hear-t-beat rate falls within the target range.
The dlE~iculties and incollveniences attending the attachment of bipolar electrodes to the wrists or to other spaced points on opposite sides of the heart and the obvious problems in exercising with such electrodes in place have lead others to pursue the development of mechanical devices for sensing the pulse and then converting - 10the mechanically-sensed pulse to an electrical signal for Us.
processing and display.~ Patent 3,807,388, for example, discloses a heartbeat rate monitor in the form of a wrist-watch having a transducer mounted in the wrist strap to detect the pressure changes (pulses) and convert -them to electrical signals.
Apart from the fact that differences sometimes ` exist between pulse rate and true heartbeat rate, substantial problems exist in providing a transducer which is easily positioned for proper operation and which is capable of 20accurately sensing the pulse for any of a variety of users.
Therefore, despite the availability oE technology and electrical hardware for processing and displayiny in digital form the pulse rate o~ a patient once that pulse has been detected by a suitable pressure transducer, devices in wristwatch form or in other convenient portable form have ~¦ not achieved widespread use or substantial commercial availability.
U,S.
Other~patents illustrative of the art are 3,863,626, 3,802,698, 3,948,250, 3,586,835, and 3,717,140. Reference 30 may also be had to V. Elings et al, A Cardiotachometer which Calculates ~ate Digitally, IEEE Transactions on Biomedical Engineering, 468-470 (November, 1973), and Hartley, Analogue-:.' ' ~ - 3 -~()823~L6 Display Rate Meter suild ~round Digital Switching llclllents, Medi.cal and Biological. Engineering, 107-108 (January, 1976).
Summary The invention relates to an electrode system comprising a band adapted to be worn on the wrist of one hand and having inner sensing electrode means ~ :
directly engageable with such wrist; insulating barrier means extending over the inner sensing electrode means for shielding the same against contact with any part of the wearer's body except the wrist;
outer sensing electrode means carried by the band and electrically isolated from the inner electrode means, the outer sensing electrode means being adapted for selective contact by the fingers oE the wearer's other hand; and sensing circuit means in electrical circuit with the inner and outer electrode means for ~::
sensing electrical signals derived therefrom, In its method aspect the invention relates ~
to a method for determining heart activity~ comprising -;
strapping a first cardiac electrode directly aga:Lnst the wrist of one hand of a wearer by a wr;lstbnnd which also providcs an exposed æecond electrode supported out of contact with the wrist and in electrically-isolated relation with respect to the first electrode? the first and second electrodes being in circuit with means for processing bioelectrical signals from the electrodes and for providing a ~: i ~ measurement of heart activity, the wearer thereafter ,. .
touching the second electrode with at least one finger . of the other hand to complete the electrical circuit, whereby, the first electrode is in direct electrical contact with a limb on one side of the electrical axis mb~ ~ - 4 -of the h~art and ~he second electrode is in electrical contact with a lim~ on the other slde of the heart's electrlcal axls.
~ n important aspect of this invention lles in the discovery that the problems of defecting differences in electrical potential across the heart as a direct indication of heart activity, in a manner convenient enough to use by someone wishing to check heartbeat rate during an ordinary exercise program, or desiring to display and/or transmit his electrocardiogram, may be achieved by locating both of the skin electrodes upon only one of the wearer's wrists and by constructing the wristband so that one of the two electrodes remains in electrical contact with the skin of that wrist, The other electrode, which is exposed along the outer .
:.i ~ surface of the band (either ~he strap itself or a . .
casing supported by the strap) remains quiescent until ; such time as the wearer touches that electrode with the other hand. Such contact completes the circuit ., ~, .
20 with the inner electrode in contact with the wrist , and the outer electrode in contact with the fingers of the other hand. The electrical ECG slgnals picked up by the electrodes are then processed and disp~ayed or transmitted u~ilLzing any of a varLety of known clrcuit arrangements and components. In one convenient form, the band includes a casing which contains all of the circuit elements (other than the electrodes) and digital display means such as light-emitting diodes for visually presenting heart rate in beats per minute.
30 Alternatively it may be desirable to develop and/or transmit a signal representative of Lead I of ~he electrocardiogram for such purposes as obtaining advice regarding medicines taken for disordered heart rhythms;
-' mb/~ ~ ~ - 4a -~ 23 6 evaluating the effect of treatlllent in certain heart disor(lers; an(l/or ~ '', .
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. , ~8231~i evaluating the function of a cardiac pacemaker. When transmission, such as over a telephone, is employed it is possible for professional medical evaluation to be made at a remote location, thereby saving time and ncreaslng convenience.
Further objects, advantages, and embodiments of the invention will appear from the drawings and specification.
Drawings Figure 1 is a perspective view of a heartbeat rate indicator embodying the invention, the indicator being 10 illustrated as it is being used to display heartbeat rate in beats per minute.
, . . .
Figure 2 is a simplified block diagram of the heartbeat rate monitor.
, !
Figure 3 is a fragmentary elevational view -taken partly in section and showing the electrode construction of the heartbeat rate indicator.
.
. ~ . , Figure 4 is a view similar to Figure 3 but deplcting another embodiment of the invention.
.. .
~ Description , ReEerring to Figures 1-3, the numeral tO generally 20 designates a heartbeat rate indicator in the form of a wristband having a strap 11 and a casing 12. The strap has electrically-conductive inner and outer layers 13 and 14 ~,l separated by an electrically-insulating central layer 15.
When worn on the wrist, in the manner generally depicted in Figure 1, only the conductive inner layer 13is in contact ~
with the wrist. Both the outer layer 14 and the casing 12, which may be in electrical contact with each other, are ~, ,. . .
, - 5 -~L~82316 electri~ally lsolated from t~le inner layer 13 ~nd from the wearer's wrist 16.
The conductive inner layer 13 serves as one electrode of a bipolar electrode system, the other electrode of the system heing ou-ter layer 14. As shown in Figure 1, the strap is of sufficient wid-th so that its exposed outer surface may be easily contacted by the fingers of the wearer's other hand 17 without at the same time causing direct contact between those finyers and wrist 16.
OIn the illustration given, the band is shown as it is being squeezed gently between the thumb 17a and index finger 17b and, al-though such a procedure helps assure effective electrical contact between the inner electrode and wrist 16, and between the outer electrode and finyers 17, it is to be understood that other fingers 17 might be used to contact the outer surface of the band or that, if desired, only a single finger, such as index finyer 17b, , . . .
miyht be used for that purpose. An important aspect of the .
invention is that it forces a wearer to hold his arms fixed 20duriny the measurement so as to remove artifacts, such as musGle movemen~, that miyht cause error~
The electrical circuitry for the heartbeat rate U,S, indicator may be similar to that disclosed in~patent 3,807j388, or in other references previously identified.
As diayrammatically depicted in Figure 2, electrical signals detected by electrodes 13 and 14 are supplied to a sensing circuit including amplifier 1~ and transmitted by way of ;~
shaper circuit 19 to an AND gate 20 to which a signal derived from divider 21 and oscillator 22 is also supplied.
30The oscillator may be crystal-controlled for operating at 16.38~ kHz, and the divider circuit 22 may supply an output signal of 0.5 Hz. The output siynal of divider circuit 21 ~B~3~6 may also, if desired, be supplied to a binary coded decimal to decimal decoder, to provide an output ~or display o~
seconds and, by way of a further dividex circuit, to other decoders for the display of minutes and hours, respectively (not shown) where it is desixed that the wristband indicator display time as well as heartbeat rate. Specific Us, reference is made to~paten-t 3,807,388 for such a modification.
For a lost or gained pulse from divider 21 to be .~` insignificant, the frequency o~ the signal supplied by th~
lOdivider to gate 20 should be, for example, 100 times the -~ fastest heartbeat rate of say 150 beats per minute, so that the frequency required is about 250 pulses per second. To derive such a signal the divider 21 can be intercepted at the appropriate point to give an output of 256 pulses per second, this signal being supplied to the gate 20. The output of the gate 20 is supplied to an accumulating counter 23, the number of pulses at the minimum heartbeat rate of say 30 pulses per minute determining the capacity of the . counter 23.
:. 20 To reduce the possibility of occasional random ~l heartbeat periods being displayed, it is preEerable for the output of the shaper circuit 19 to be divided in frequency by a divider 2~ beinq be.ing supplied to the gate 20 so as ; to average the measurement over several heartbeat periods.
This requires a cor~esponding increase in the capacity of ~ the counter 23. A furt.her output of the gate 20 is connected :~. to a reset circuit 25 which resets the counter 23 at the.end. . ,. I .
of each counting period. The num~er of pulses counted in each counting period varies inversely with the heartbeat rate 30 and hence a suitable readou~ circuit 26 may be provided to give signals corresponding to lOQ's, lO's, and units of I heartbeat rate for supplying to an array 27 of light-emitting . , .
: - 7 -10823~L6 diodes. Upon comp1etlon of the circuit in the manner depicted in Figure 1, the light-emitting diodes display the wearer's heartbeat rate in beats per minute through window 28. It will be understood, of course, -that other display means such as liquid crys~als might be used.
The method of use of the device is believed apparent from the foregoing.. The wearer simply places the wristband device on his wrist 16 before commencing an exercise program, a sports activity, or any other activity 10 for which heartbeat rate monitoring is desired. By attaching the device to his wrist 16, the user pre-positions inner electrode 13 in direct electrical contact with one limb, that is, a part of the bodv on one side of the electrical axis of the heart. Completion of the circuit does not take place, however, until the user, desiring to obtain a visual digital indication of his heartbeat rate, touches the outer electrode 14 of the same wristband with a finger (or fingers) of his other hand. The effectiveness of the electrical contact is improved by slight pressure, as already described, 20 and is further enhanced by perspiration developed as a result :~
of the physical activity involved. :~
The embodiment illustrated in Figure 4 .is similar to the one already described except that the outer electrode takes the form of a conductive push button 29 carried by the casing portion 12' of the wristband device. The inner electrode 13' is similar to previously-described electrode 13, and an insulatin~ layer 15' extends over electrode 13' to insure that the inner electrode contacts no portion of . the wearer's body other than wrist 16. In addition to ~;
30servin~ as the second electrode of the bipolar electrode system, button 29 may be arranged to ac~uate a switch when depressed to couple the power source to the display circui.ts, whicil may include light-emittirlg diodes, only when the wearer desires a readout.
While in the foregoing an embodiment o.f the invention has been disclosed .in considerable detail for purposes of illustration, it will be understood by those skilled in the art that many of these details may be varied without departing from the spirit and scope of the invention.
' ., :' . .
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Many biologic, especially electrical, parameters are measured by the difEerence in electrical po-tential across specific organs or organ systems. Specifically, electrocardiograms (ECG) and other electrical parameters of cardiac activity require two or more electrodes or sensing devices placed so that they are on each side of the ` electrical axis of the heart. The basic arrangement, known as Lead I, consists of strapping an electrode to each wrist so as to measure the electrical potential difEerence lO across the heart. While such an arrangement is perfectly acceptable for clinical testing, it is inconvenient and impractical, if not impossible, in other circumstances such as during routine exercise programs.
A yrowing number of individuals are performing exercise proyrams regularly or in-termittently. It is generally acknowledged that the heart rate is the ~est indicator of the value of such exercise to the cardiovascular systemj i.e., when enough effort is expended to be useful and when so much effort is expended as to be danyerous~
20 Thus, as reported in ~. R. Zohman, Exercise Your Weiyht to .. , ~ .
i Fitness and Heart Health, 16-18 (CPC Internat.ional, 1974), .. : . :, it is important in an e~fective exercise training proyram that there be a gradual increase in heart rate until a target xate of 70 to 85 percent of the maximum attainable rate (depending on age and physical condition) is achieved.
A period of 20 to 30 minutes of exercise at the target level will then provide a significant conditioniny effect on the cardiovascular system. While the average taryet zones for different aye groups are readily available ~for an average !
30 40-year old male it is, for example, 128 to 155 beats per minute), it is apparent tha-t most individuals lack the skill ,~, :`
; 2 D~
~(~823~L6 or inclina tion to tak~ their own pulse at various intervals durincJ the exerclse period to ascertain whether their hear-t-beat rate falls within the target range.
The dlE~iculties and incollveniences attending the attachment of bipolar electrodes to the wrists or to other spaced points on opposite sides of the heart and the obvious problems in exercising with such electrodes in place have lead others to pursue the development of mechanical devices for sensing the pulse and then converting - 10the mechanically-sensed pulse to an electrical signal for Us.
processing and display.~ Patent 3,807,388, for example, discloses a heartbeat rate monitor in the form of a wrist-watch having a transducer mounted in the wrist strap to detect the pressure changes (pulses) and convert -them to electrical signals.
Apart from the fact that differences sometimes ` exist between pulse rate and true heartbeat rate, substantial problems exist in providing a transducer which is easily positioned for proper operation and which is capable of 20accurately sensing the pulse for any of a variety of users.
Therefore, despite the availability oE technology and electrical hardware for processing and displayiny in digital form the pulse rate o~ a patient once that pulse has been detected by a suitable pressure transducer, devices in wristwatch form or in other convenient portable form have ~¦ not achieved widespread use or substantial commercial availability.
U,S.
Other~patents illustrative of the art are 3,863,626, 3,802,698, 3,948,250, 3,586,835, and 3,717,140. Reference 30 may also be had to V. Elings et al, A Cardiotachometer which Calculates ~ate Digitally, IEEE Transactions on Biomedical Engineering, 468-470 (November, 1973), and Hartley, Analogue-:.' ' ~ - 3 -~()823~L6 Display Rate Meter suild ~round Digital Switching llclllents, Medi.cal and Biological. Engineering, 107-108 (January, 1976).
Summary The invention relates to an electrode system comprising a band adapted to be worn on the wrist of one hand and having inner sensing electrode means ~ :
directly engageable with such wrist; insulating barrier means extending over the inner sensing electrode means for shielding the same against contact with any part of the wearer's body except the wrist;
outer sensing electrode means carried by the band and electrically isolated from the inner electrode means, the outer sensing electrode means being adapted for selective contact by the fingers oE the wearer's other hand; and sensing circuit means in electrical circuit with the inner and outer electrode means for ~::
sensing electrical signals derived therefrom, In its method aspect the invention relates ~
to a method for determining heart activity~ comprising -;
strapping a first cardiac electrode directly aga:Lnst the wrist of one hand of a wearer by a wr;lstbnnd which also providcs an exposed æecond electrode supported out of contact with the wrist and in electrically-isolated relation with respect to the first electrode? the first and second electrodes being in circuit with means for processing bioelectrical signals from the electrodes and for providing a ~: i ~ measurement of heart activity, the wearer thereafter ,. .
touching the second electrode with at least one finger . of the other hand to complete the electrical circuit, whereby, the first electrode is in direct electrical contact with a limb on one side of the electrical axis mb~ ~ - 4 -of the h~art and ~he second electrode is in electrical contact with a lim~ on the other slde of the heart's electrlcal axls.
~ n important aspect of this invention lles in the discovery that the problems of defecting differences in electrical potential across the heart as a direct indication of heart activity, in a manner convenient enough to use by someone wishing to check heartbeat rate during an ordinary exercise program, or desiring to display and/or transmit his electrocardiogram, may be achieved by locating both of the skin electrodes upon only one of the wearer's wrists and by constructing the wristband so that one of the two electrodes remains in electrical contact with the skin of that wrist, The other electrode, which is exposed along the outer .
:.i ~ surface of the band (either ~he strap itself or a . .
casing supported by the strap) remains quiescent until ; such time as the wearer touches that electrode with the other hand. Such contact completes the circuit ., ~, .
20 with the inner electrode in contact with the wrist , and the outer electrode in contact with the fingers of the other hand. The electrical ECG slgnals picked up by the electrodes are then processed and disp~ayed or transmitted u~ilLzing any of a varLety of known clrcuit arrangements and components. In one convenient form, the band includes a casing which contains all of the circuit elements (other than the electrodes) and digital display means such as light-emitting diodes for visually presenting heart rate in beats per minute.
30 Alternatively it may be desirable to develop and/or transmit a signal representative of Lead I of ~he electrocardiogram for such purposes as obtaining advice regarding medicines taken for disordered heart rhythms;
-' mb/~ ~ ~ - 4a -~ 23 6 evaluating the effect of treatlllent in certain heart disor(lers; an(l/or ~ '', .
~' .
!"
.' ~, , , ~
.' ' , ' '.
'" ' '" : ~ .
.' .
.", ' ;....................................................................... .
~: ?
. i ~ .
::
, mb/~,~ - 4b - : ~.
. , ~8231~i evaluating the function of a cardiac pacemaker. When transmission, such as over a telephone, is employed it is possible for professional medical evaluation to be made at a remote location, thereby saving time and ncreaslng convenience.
Further objects, advantages, and embodiments of the invention will appear from the drawings and specification.
Drawings Figure 1 is a perspective view of a heartbeat rate indicator embodying the invention, the indicator being 10 illustrated as it is being used to display heartbeat rate in beats per minute.
, . . .
Figure 2 is a simplified block diagram of the heartbeat rate monitor.
, !
Figure 3 is a fragmentary elevational view -taken partly in section and showing the electrode construction of the heartbeat rate indicator.
.
. ~ . , Figure 4 is a view similar to Figure 3 but deplcting another embodiment of the invention.
.. .
~ Description , ReEerring to Figures 1-3, the numeral tO generally 20 designates a heartbeat rate indicator in the form of a wristband having a strap 11 and a casing 12. The strap has electrically-conductive inner and outer layers 13 and 14 ~,l separated by an electrically-insulating central layer 15.
When worn on the wrist, in the manner generally depicted in Figure 1, only the conductive inner layer 13is in contact ~
with the wrist. Both the outer layer 14 and the casing 12, which may be in electrical contact with each other, are ~, ,. . .
, - 5 -~L~82316 electri~ally lsolated from t~le inner layer 13 ~nd from the wearer's wrist 16.
The conductive inner layer 13 serves as one electrode of a bipolar electrode system, the other electrode of the system heing ou-ter layer 14. As shown in Figure 1, the strap is of sufficient wid-th so that its exposed outer surface may be easily contacted by the fingers of the wearer's other hand 17 without at the same time causing direct contact between those finyers and wrist 16.
OIn the illustration given, the band is shown as it is being squeezed gently between the thumb 17a and index finger 17b and, al-though such a procedure helps assure effective electrical contact between the inner electrode and wrist 16, and between the outer electrode and finyers 17, it is to be understood that other fingers 17 might be used to contact the outer surface of the band or that, if desired, only a single finger, such as index finyer 17b, , . . .
miyht be used for that purpose. An important aspect of the .
invention is that it forces a wearer to hold his arms fixed 20duriny the measurement so as to remove artifacts, such as musGle movemen~, that miyht cause error~
The electrical circuitry for the heartbeat rate U,S, indicator may be similar to that disclosed in~patent 3,807j388, or in other references previously identified.
As diayrammatically depicted in Figure 2, electrical signals detected by electrodes 13 and 14 are supplied to a sensing circuit including amplifier 1~ and transmitted by way of ;~
shaper circuit 19 to an AND gate 20 to which a signal derived from divider 21 and oscillator 22 is also supplied.
30The oscillator may be crystal-controlled for operating at 16.38~ kHz, and the divider circuit 22 may supply an output signal of 0.5 Hz. The output siynal of divider circuit 21 ~B~3~6 may also, if desired, be supplied to a binary coded decimal to decimal decoder, to provide an output ~or display o~
seconds and, by way of a further dividex circuit, to other decoders for the display of minutes and hours, respectively (not shown) where it is desixed that the wristband indicator display time as well as heartbeat rate. Specific Us, reference is made to~paten-t 3,807,388 for such a modification.
For a lost or gained pulse from divider 21 to be .~` insignificant, the frequency o~ the signal supplied by th~
lOdivider to gate 20 should be, for example, 100 times the -~ fastest heartbeat rate of say 150 beats per minute, so that the frequency required is about 250 pulses per second. To derive such a signal the divider 21 can be intercepted at the appropriate point to give an output of 256 pulses per second, this signal being supplied to the gate 20. The output of the gate 20 is supplied to an accumulating counter 23, the number of pulses at the minimum heartbeat rate of say 30 pulses per minute determining the capacity of the . counter 23.
:. 20 To reduce the possibility of occasional random ~l heartbeat periods being displayed, it is preEerable for the output of the shaper circuit 19 to be divided in frequency by a divider 2~ beinq be.ing supplied to the gate 20 so as ; to average the measurement over several heartbeat periods.
This requires a cor~esponding increase in the capacity of ~ the counter 23. A furt.her output of the gate 20 is connected :~. to a reset circuit 25 which resets the counter 23 at the.end. . ,. I .
of each counting period. The num~er of pulses counted in each counting period varies inversely with the heartbeat rate 30 and hence a suitable readou~ circuit 26 may be provided to give signals corresponding to lOQ's, lO's, and units of I heartbeat rate for supplying to an array 27 of light-emitting . , .
: - 7 -10823~L6 diodes. Upon comp1etlon of the circuit in the manner depicted in Figure 1, the light-emitting diodes display the wearer's heartbeat rate in beats per minute through window 28. It will be understood, of course, -that other display means such as liquid crys~als might be used.
The method of use of the device is believed apparent from the foregoing.. The wearer simply places the wristband device on his wrist 16 before commencing an exercise program, a sports activity, or any other activity 10 for which heartbeat rate monitoring is desired. By attaching the device to his wrist 16, the user pre-positions inner electrode 13 in direct electrical contact with one limb, that is, a part of the bodv on one side of the electrical axis of the heart. Completion of the circuit does not take place, however, until the user, desiring to obtain a visual digital indication of his heartbeat rate, touches the outer electrode 14 of the same wristband with a finger (or fingers) of his other hand. The effectiveness of the electrical contact is improved by slight pressure, as already described, 20 and is further enhanced by perspiration developed as a result :~
of the physical activity involved. :~
The embodiment illustrated in Figure 4 .is similar to the one already described except that the outer electrode takes the form of a conductive push button 29 carried by the casing portion 12' of the wristband device. The inner electrode 13' is similar to previously-described electrode 13, and an insulatin~ layer 15' extends over electrode 13' to insure that the inner electrode contacts no portion of . the wearer's body other than wrist 16. In addition to ~;
30servin~ as the second electrode of the bipolar electrode system, button 29 may be arranged to ac~uate a switch when depressed to couple the power source to the display circui.ts, whicil may include light-emittirlg diodes, only when the wearer desires a readout.
While in the foregoing an embodiment o.f the invention has been disclosed .in considerable detail for purposes of illustration, it will be understood by those skilled in the art that many of these details may be varied without departing from the spirit and scope of the invention.
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Claims (15)
1. An electrode system comprising a band adapted to be worn on the wrist of one hand and having inner sensing electrode means directly engagable with such wrist; insulating barrier means extending over said inner sensing electrode means for shielding the same against contact with any part of the wearer's body except said wrist; outer sensing electrode means carried by said band and electrically isolated from said inner electrode means, said outer sensing electrode means being adapted for selective contact by the fingers of the wearer's other hand; and sensing circuit means in electrical circuit with said inner and outer electrode means for sensing, electrical signals derived therefrom.
2. The electrode system of Claim 1 in which there is measuring circuit means responsive to said sensing circuit means for measuring heart activity.
3. The electrode system of Claim 2 in which there is display circuit means responsive to said measuring means for generating a visual signal representative of heart activity.
4. The electrode system of Claim 3 in which said measuring circuit means measures heartbeat rate and said display circuit means generate a visual signal representative of heartbeat rate.
5. The electrode system of Claim 4 in which said band includes a casing containing said sensing, measuring, and display circuit means and providing a face for the visual display of said heartbeat rate.
6. The electrode system of Claim 5 in which said outer electrode sensing means comprises an electrically-conductive finger button projecting from said casing.
7. The electrode system of Claim 1 in which said outer electrode sensing means comprises an outer electrically-conductive layer of said band extending a substantial extent along the circumference of said band.
8. The electrode system of Claim 4 in which said display circuit means provides a digital display of heart-beat rate in beats per minute.
9. The electrode system of Claim 8 in which said display circuit means includes light-emitting diodes.
10. The electrode system of Claim 8 in which said display circuit means includes liquid crystals.
11. The electrode system of Claim 4 in which said measuring circuit system includes time-based signal generating means and means responsive to both said sensing circuit means and said time-based signal generating means.
for generating a signal representative of heart activity.
for generating a signal representative of heart activity.
12. A method for determining heart activity, comprising strapping a first cardiac electrode directly against the wrist of one hand of a wearer by a wristband which also provides an exposed second electrode supported out of contact with said wrist and in electrically-isolated relation with respect to said first electrode, said first and second electrodes being in circuit with means for processing bioelectrical signals from said electrodes and for providing a measurement of heart activity, said wearer thereafter touching said second electrode with at least one finger of the other hand to complete the electrical circuit, whereby, said first electrode is in direct electrical contact with a limb on one side of the electrical axis of the heart and the second electrode is in electrical contact with a limb on the other side of the heart's electrical axis.
13. The method of Claim 12 in which said means for processing bioelectric signals from said electrodes includes means for displaying a visual indication of heart-beat rate, whereby, upon touching said second electrode with at least one finger of said other hand to complete the electrical circuit, a signal representative of heartbeat rate is generated and visually displayed.
14. The method of Claim 12 in which said step of touching said second electrode with at least one finger of the other hand includes immobilizing said hands relative to each other, thereby eliminating artifacts that might otherwise be generated by hand movement.
15. The method of Claim 12 in which said step of touching said second electrode involves firmly gripping said wristband between a pair of fingers of said other hand to place said fingers in firm electrical contact with said second electrode and simultaneously urge said first electrode into tight electrical contact with the wrist of said one hand.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US718,017 | 1976-08-26 | ||
| US05/718,017 US4120294A (en) | 1976-08-26 | 1976-08-26 | Electrode system for acquiring electrical signals from the heart |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1082316A true CA1082316A (en) | 1980-07-22 |
Family
ID=24884479
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA285,404A Expired CA1082316A (en) | 1976-08-26 | 1977-08-24 | Electrode system for acquiring electrical signals from the heart |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US4120294A (en) |
| JP (1) | JPS5916775B2 (en) |
| CA (1) | CA1082316A (en) |
| CH (1) | CH619854A5 (en) |
| DE (1) | DE2738605A1 (en) |
| FR (1) | FR2362613A1 (en) |
| GB (1) | GB1584637A (en) |
Families Citing this family (114)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4295472A (en) * | 1976-08-16 | 1981-10-20 | Medtronic, Inc. | Heart rate monitor |
| DE2815339A1 (en) * | 1978-04-10 | 1979-10-18 | Konstruktions Und Entwicklungs | Pocket medical examination appts. - has probes for heart voltage pulses connected to electronic evaluation unit |
| US4221223A (en) * | 1978-05-24 | 1980-09-09 | Medtronic, Inc. | Cardiac monitoring apparatus |
| US4230127A (en) * | 1978-05-24 | 1980-10-28 | Medtronic, Inc. | Cardiac monitoring apparatus |
| US4239048A (en) * | 1979-02-06 | 1980-12-16 | Multitronics Corporation | Cardiotachometer using autocorrelation techniques |
| US4412546A (en) * | 1979-05-09 | 1983-11-01 | Medtronic, Inc. | Cardiac monitoring apparatus |
| GB2058355A (en) * | 1979-06-21 | 1981-04-08 | Pulse Time Uk Ltd | Cardiovascular monitors |
| JPS6011930Y2 (en) * | 1979-08-16 | 1985-04-19 | 保安工業株式会社 | traffic sign |
| AU6921381A (en) * | 1980-07-03 | 1982-02-02 | Prime Microelectronic Instruments, Inc. | Cardiotachometer using autocorrelation techniques |
| US4407295A (en) * | 1980-10-16 | 1983-10-04 | Dna Medical, Inc. | Miniature physiological monitor with interchangeable sensors |
| FR2514633A1 (en) * | 1981-10-20 | 1983-04-22 | Saint Nicolas Cie Financiere | Combined sphygmomanometer and electrocardiograph mounted on bracelet - has electrode in casing and second electrode in form of conductive pushbutton pressed by hand of other wrist of patient |
| JPS5886141A (en) * | 1981-11-17 | 1983-05-23 | セイコーインスツルメンツ株式会社 | Pulse meter |
| EP0101870A3 (en) * | 1982-08-05 | 1986-09-17 | Kontron-Holding Ag | Portable electrocardiologic apparatus |
| EP0106756A1 (en) * | 1982-10-05 | 1984-04-25 | Gilles Ascher | Portable E.C.G. recording apparatus |
| FR2551647A1 (en) * | 1983-09-13 | 1985-03-15 | Gilles Ascher | Portable apparatus with a bracelet intended for the recording of electrocardiograms |
| US4540001A (en) * | 1982-12-02 | 1985-09-10 | Ewing John G | Heart monitor for horses |
| JPS6023008U (en) * | 1983-07-23 | 1985-02-16 | 株式会社 メデツク | Wristwatch electrocardiogram recording device |
| US4711248A (en) * | 1983-12-01 | 1987-12-08 | Biokinetics, Inc. | Physiological pressure monitor |
| JPS6146566A (en) * | 1984-08-13 | 1986-03-06 | Victor Co Of Japan Ltd | Absolute value circuit |
| US4889132A (en) * | 1986-09-26 | 1989-12-26 | The University Of North Carolina At Chapel Hill | Portable automated blood pressure monitoring apparatus and method |
| US5228449A (en) * | 1991-01-22 | 1993-07-20 | Athanasios G. Christ | System and method for detecting out-of-hospital cardiac emergencies and summoning emergency assistance |
| US5645509A (en) * | 1991-07-02 | 1997-07-08 | Icon Health & Fitness, Inc. | Remote exercise control system |
| US5191891A (en) * | 1991-09-10 | 1993-03-09 | Ralin, Inc. | Portable ECG monitor/recorder |
| US5226425A (en) * | 1991-09-10 | 1993-07-13 | Ralin, Inc. | Portable ECG monitor/recorder |
| US5289824A (en) * | 1991-12-26 | 1994-03-01 | Instromedix, Inc. | Wrist-worn ECG monitor |
| US5581369A (en) * | 1992-09-25 | 1996-12-03 | Ralin, Inc. | Apparatus and method for communicating electrocardiographic data to a facsimile machine |
| US5738104A (en) * | 1995-11-08 | 1998-04-14 | Salutron, Inc. | EKG based heart rate monitor |
| US6149602A (en) * | 1996-09-10 | 2000-11-21 | Arcelus; Almudena | User-worn electrocardiogram viewer device |
| US7438670B2 (en) * | 1997-10-17 | 2008-10-21 | True Fitness Technology, Inc. | Exercise device for side-to-side stepping motion |
| US5931791A (en) * | 1997-11-05 | 1999-08-03 | Instromedix, Inc. | Medical patient vital signs-monitoring apparatus |
| US8029415B2 (en) | 1999-07-08 | 2011-10-04 | Icon Ip, Inc. | Systems, methods, and devices for simulating real world terrain on an exercise device |
| US6447424B1 (en) | 2000-02-02 | 2002-09-10 | Icon Health & Fitness Inc | System and method for selective adjustment of exercise apparatus |
| US7628730B1 (en) | 1999-07-08 | 2009-12-08 | Icon Ip, Inc. | Methods and systems for controlling an exercise apparatus using a USB compatible portable remote device |
| GB2367621A (en) * | 2000-06-05 | 2002-04-10 | Seven Of Nine Ltd | Mounting arrangements for bloodflow parameter monitoring devices |
| FI111129B (en) | 2000-08-30 | 2003-06-13 | Polar Electro Oy | Method, heart rate measurement arrangement and electrode structure for ECG signal measurement |
| AU2002255568B8 (en) | 2001-02-20 | 2014-01-09 | Adidas Ag | Modular personal network systems and methods |
| US6730002B2 (en) * | 2001-09-28 | 2004-05-04 | Icon Ip, Inc. | Inclining tread apparatus |
| FI116117B (en) * | 2003-04-17 | 2005-09-30 | Polar Electro Oy | Measuring device and method for measuring heart rate and the method of manufacture of the measuring device |
| US6950695B2 (en) * | 2003-07-30 | 2005-09-27 | Yu-Yu Chen | Watch-typed heartbeat sensing device |
| US8616967B2 (en) | 2004-02-25 | 2013-12-31 | Cfph, Llc | System and method for convenience gaming |
| US7534169B2 (en) | 2005-07-08 | 2009-05-19 | Cfph, Llc | System and method for wireless gaming system with user profiles |
| US8092303B2 (en) | 2004-02-25 | 2012-01-10 | Cfph, Llc | System and method for convenience gaming |
| US20070060358A1 (en) | 2005-08-10 | 2007-03-15 | Amaitis Lee M | System and method for wireless gaming with location determination |
| US20070049836A1 (en) * | 2004-12-07 | 2007-03-01 | Yu-Yu Chen | Electronic wristwatch-type exercise signal detecting apparatus |
| US7308294B2 (en) * | 2005-03-16 | 2007-12-11 | Textronics Inc. | Textile-based electrode system |
| US8070604B2 (en) | 2005-08-09 | 2011-12-06 | Cfph, Llc | System and method for providing wireless gaming as a service application |
| US10510214B2 (en) | 2005-07-08 | 2019-12-17 | Cfph, Llc | System and method for peer-to-peer wireless gaming |
| US20070078324A1 (en) * | 2005-09-30 | 2007-04-05 | Textronics, Inc. | Physiological Monitoring Wearable Having Three Electrodes |
| US20070100244A1 (en) * | 2005-10-31 | 2007-05-03 | Chin-Shu Lin | Wrist-worn monitor for heartbeat detection |
| US20070167847A1 (en) * | 2006-01-19 | 2007-07-19 | Guglielmino Michael F | Method and device for using a physiological parameter to express evolution |
| US7549576B2 (en) | 2006-05-05 | 2009-06-23 | Cfph, L.L.C. | Systems and methods for providing access to wireless gaming devices |
| US7644861B2 (en) | 2006-04-18 | 2010-01-12 | Bgc Partners, Inc. | Systems and methods for providing access to wireless gaming devices |
| US8939359B2 (en) | 2006-05-05 | 2015-01-27 | Cfph, Llc | Game access device with time varying signal |
| US9306952B2 (en) | 2006-10-26 | 2016-04-05 | Cfph, Llc | System and method for wireless gaming with location determination |
| US7878030B2 (en) * | 2006-10-27 | 2011-02-01 | Textronics, Inc. | Wearable article with band portion adapted to include textile-based electrodes and method of making such article |
| US8645709B2 (en) | 2006-11-14 | 2014-02-04 | Cfph, Llc | Biometric access data encryption |
| US9411944B2 (en) | 2006-11-15 | 2016-08-09 | Cfph, Llc | Biometric access sensitivity |
| US8510567B2 (en) | 2006-11-14 | 2013-08-13 | Cfph, Llc | Conditional biometric access in a gaming environment |
| US8581721B2 (en) | 2007-03-08 | 2013-11-12 | Cfph, Llc | Game access device with privileges |
| US9183693B2 (en) | 2007-03-08 | 2015-11-10 | Cfph, Llc | Game access device |
| US8319601B2 (en) | 2007-03-14 | 2012-11-27 | Cfph, Llc | Game account access device |
| US8221290B2 (en) | 2007-08-17 | 2012-07-17 | Adidas International Marketing B.V. | Sports electronic training system with electronic gaming features, and applications thereof |
| US8702430B2 (en) | 2007-08-17 | 2014-04-22 | Adidas International Marketing B.V. | Sports electronic training system, and applications thereof |
| US8360904B2 (en) * | 2007-08-17 | 2013-01-29 | Adidas International Marketing Bv | Sports electronic training system with sport ball, and applications thereof |
| FI20085384A0 (en) * | 2008-04-29 | 2008-04-29 | Polar Electro Oy | Accessories for a performance meter |
| FI123360B (en) * | 2008-06-19 | 2013-03-15 | Seppo Juhani Saeynaejaekangas | Procedures and equipment for measuring heart rate |
| US8130095B2 (en) | 2008-08-27 | 2012-03-06 | The Invention Science Fund I, Llc | Health-related signaling via wearable items |
| US8094009B2 (en) | 2008-08-27 | 2012-01-10 | The Invention Science Fund I, Llc | Health-related signaling via wearable items |
| US8284046B2 (en) | 2008-08-27 | 2012-10-09 | The Invention Science Fund I, Llc | Health-related signaling via wearable items |
| US8125331B2 (en) | 2008-08-27 | 2012-02-28 | The Invention Science Fund I, Llc | Health-related signaling via wearable items |
| US8743079B2 (en) * | 2008-08-29 | 2014-06-03 | Nec Corporation | Position information input device and position information input method |
| US7894888B2 (en) * | 2008-09-24 | 2011-02-22 | Chang Gung University | Device and method for measuring three-lead ECG in a wristwatch |
| US8615290B2 (en) * | 2008-11-05 | 2013-12-24 | Apple Inc. | Seamlessly embedded heart rate monitor |
| DE102009015273A1 (en) | 2009-04-01 | 2010-10-14 | Albert-Ludwigs-Universität Freiburg | Method and device for determining the endurance performance of a subject |
| US8200323B2 (en) | 2009-05-18 | 2012-06-12 | Adidas Ag | Program products, methods, and systems for providing fitness monitoring services |
| US8105208B2 (en) | 2009-05-18 | 2012-01-31 | Adidas Ag | Portable fitness monitoring systems with displays and applications thereof |
| US8443634B2 (en) * | 2010-04-27 | 2013-05-21 | Textronics, Inc. | Textile-based electrodes incorporating graduated patterns |
| US8956231B2 (en) | 2010-08-13 | 2015-02-17 | Cfph, Llc | Multi-process communication regarding gaming information |
| US20120258433A1 (en) | 2011-04-05 | 2012-10-11 | Adidas Ag | Fitness Monitoring Methods, Systems, And Program Products, And Applications Thereof |
| US9339691B2 (en) | 2012-01-05 | 2016-05-17 | Icon Health & Fitness, Inc. | System and method for controlling an exercise device |
| EP2969058B1 (en) | 2013-03-14 | 2020-05-13 | Icon Health & Fitness, Inc. | Strength training apparatus with flywheel and related methods |
| EP3974036A1 (en) | 2013-12-26 | 2022-03-30 | iFIT Inc. | Magnetic resistance mechanism in a cable machine |
| TWM479113U (en) * | 2014-02-13 | 2014-06-01 | Cheng Uei Prec Ind Co Ltd | Heartbeat detecting bracelet |
| WO2015138339A1 (en) | 2014-03-10 | 2015-09-17 | Icon Health & Fitness, Inc. | Pressure sensor to quantify work |
| WO2015191445A1 (en) | 2014-06-09 | 2015-12-17 | Icon Health & Fitness, Inc. | Cable system incorporated into a treadmill |
| WO2015195965A1 (en) | 2014-06-20 | 2015-12-23 | Icon Health & Fitness, Inc. | Post workout massage device |
| KR20160029412A (en) * | 2014-09-05 | 2016-03-15 | 삼성전자주식회사 | Apparatus and method for detecting biological signal |
| US9526433B2 (en) * | 2014-09-12 | 2016-12-27 | Verily Life Sciences Llc | Wrist-mounted electrocardiography device |
| US10258828B2 (en) | 2015-01-16 | 2019-04-16 | Icon Health & Fitness, Inc. | Controls for an exercise device |
| US10391361B2 (en) | 2015-02-27 | 2019-08-27 | Icon Health & Fitness, Inc. | Simulating real-world terrain on an exercise device |
| US9913591B2 (en) | 2015-07-02 | 2018-03-13 | Verily Life Sciences Llc | Wrist-mounted device with integrated electronics |
| US10092203B2 (en) * | 2015-08-21 | 2018-10-09 | Verily Life Sciences Llc | Using skin resistance measurements to determine timing of bio-telemetry measurements |
| US10953305B2 (en) | 2015-08-26 | 2021-03-23 | Icon Health & Fitness, Inc. | Strength exercise mechanisms |
| WO2017051408A1 (en) | 2015-09-21 | 2017-03-30 | Ziv Healthcare Ltd. | Monitoring and stimulation module |
| CN105266794B (en) * | 2015-11-02 | 2018-05-25 | 广东小天才科技有限公司 | A kind of portable equipment and method for ECG detecting |
| US10716478B2 (en) * | 2015-12-29 | 2020-07-21 | Motorola Mobility Llc | Wearable device heart monitor systems |
| US10625137B2 (en) | 2016-03-18 | 2020-04-21 | Icon Health & Fitness, Inc. | Coordinated displays in an exercise device |
| US10272317B2 (en) | 2016-03-18 | 2019-04-30 | Icon Health & Fitness, Inc. | Lighted pace feature in a treadmill |
| US10561894B2 (en) | 2016-03-18 | 2020-02-18 | Icon Health & Fitness, Inc. | Treadmill with removable supports |
| US10293211B2 (en) | 2016-03-18 | 2019-05-21 | Icon Health & Fitness, Inc. | Coordinated weight selection |
| US10493349B2 (en) | 2016-03-18 | 2019-12-03 | Icon Health & Fitness, Inc. | Display on exercise device |
| US10252109B2 (en) | 2016-05-13 | 2019-04-09 | Icon Health & Fitness, Inc. | Weight platform treadmill |
| US10441844B2 (en) | 2016-07-01 | 2019-10-15 | Icon Health & Fitness, Inc. | Cooling systems and methods for exercise equipment |
| US10471299B2 (en) | 2016-07-01 | 2019-11-12 | Icon Health & Fitness, Inc. | Systems and methods for cooling internal exercise equipment components |
| US10671705B2 (en) | 2016-09-28 | 2020-06-02 | Icon Health & Fitness, Inc. | Customizing recipe recommendations |
| US10500473B2 (en) | 2016-10-10 | 2019-12-10 | Icon Health & Fitness, Inc. | Console positioning |
| US10376736B2 (en) | 2016-10-12 | 2019-08-13 | Icon Health & Fitness, Inc. | Cooling an exercise device during a dive motor runway condition |
| TWI646997B (en) | 2016-11-01 | 2019-01-11 | 美商愛康運動與健康公司 | Distance sensor for console positioning |
| US10661114B2 (en) | 2016-11-01 | 2020-05-26 | Icon Health & Fitness, Inc. | Body weight lift mechanism on treadmill |
| TWI680782B (en) | 2016-12-05 | 2020-01-01 | 美商愛康運動與健康公司 | Offsetting treadmill deck weight during operation |
| US11589621B2 (en) | 2017-05-23 | 2023-02-28 | Rai Strategic Holdings, Inc. | Heart rate monitor for an aerosol delivery device |
| TWI722450B (en) | 2017-08-16 | 2021-03-21 | 美商愛康運動與健康公司 | System for opposing axial impact loading in a motor |
| US10729965B2 (en) | 2017-12-22 | 2020-08-04 | Icon Health & Fitness, Inc. | Audible belt guide in a treadmill |
| KR102315742B1 (en) * | 2019-04-25 | 2021-10-21 | 주식회사 스카이랩스 | Ring-shaped bio-signal detection device |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3450133A (en) * | 1967-03-02 | 1969-06-17 | Alexander A Birch Jr | Electrocardiograph electrode system |
| GB1312107A (en) * | 1970-09-29 | 1973-04-04 | Orr T | Heartbeat rate monitors |
| US3772874A (en) * | 1971-12-09 | 1973-11-20 | Princeton Materials Science | Display apparatus and chronometer utilizing optically variable liquid |
| US3826246A (en) * | 1973-03-07 | 1974-07-30 | Esb Inc | Apparatus for sensing physiological potentials |
| US3868947A (en) * | 1973-10-16 | 1975-03-04 | Us Government | Concentric electrode construction for an electrocardiogram transmitter |
| US3889163A (en) * | 1974-01-14 | 1975-06-10 | Habi Chek Corp | Means to assist a person in overcoming habits |
| US3972320A (en) * | 1974-08-12 | 1976-08-03 | Gabor Ujhelyi Kalman | Patient monitoring system |
| US3983690A (en) * | 1975-05-19 | 1976-10-05 | Mcsohmer Corporation | Digital timepiece having chronometric display |
| US4009708A (en) * | 1975-05-29 | 1977-03-01 | Fay Jr John J | Pulse rate recorder |
| GB1579690A (en) * | 1976-08-16 | 1980-11-19 | Medtronic Inc | Electromedical apparatus |
-
1976
- 1976-08-26 US US05/718,017 patent/US4120294A/en not_active Expired - Lifetime
-
1977
- 1977-08-23 GB GB35277/77A patent/GB1584637A/en not_active Expired
- 1977-08-24 CA CA285,404A patent/CA1082316A/en not_active Expired
- 1977-08-25 JP JP52102503A patent/JPS5916775B2/en not_active Expired
- 1977-08-25 FR FR7725908A patent/FR2362613A1/en active Granted
- 1977-08-26 CH CH1047577A patent/CH619854A5/fr not_active IP Right Cessation
- 1977-08-26 DE DE19772738605 patent/DE2738605A1/en not_active Ceased
Also Published As
| Publication number | Publication date |
|---|---|
| DE2738605A1 (en) | 1978-03-02 |
| FR2362613A1 (en) | 1978-03-24 |
| JPS5916775B2 (en) | 1984-04-17 |
| CH619854A5 (en) | 1980-10-31 |
| US4120294A (en) | 1978-10-17 |
| JPS5341080A (en) | 1978-04-14 |
| FR2362613B1 (en) | 1984-08-17 |
| GB1584637A (en) | 1981-02-18 |
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