US3620208A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ekg amplifying electrode pickup
Assignee: United States Atomic Energy Commission
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Filing: 1969-11-03
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Granted: 1971-11-16
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Expires: 1989-11-03
Abstract
Abstract An amplifying electrode pickup for an electrocardiograph (EKG.) device consisting broadly of an impedance converter integrated amplifier circuit potted in a metal shell. The integrated circuit is biased by a nanoamp electrical current. The EKG. signal is sensed by a small sensor plate or disc positioned in a boot or cover and is electrically insulated from the shell. The circuit has a very high input impedance to minimize the effect of skin contact resistance changes, and a very low output impedance to minimize noise pickup by the signal line between the electrode and the EKG. electronics. Electronic circuitry in the potted metal shell also includes a diode voltage clamp and decoupling RC circuits. A multiconductor cable provides shielding, conducts power to the electrode, and transmits the signal from the electrode through an integral coaxial cable. Because of the low (nanoamp) biasing current, signal traces of numerous separate electrodes can be simultaneously recorded without exceeding the maximum permissible current through the human body as established by the American Heart Association.
Inventors
- 👤 Wayne R Higley
- 👤 Harry L Silcocks
- 👤 James A Waggoner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:28
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/24; A61B5/30; A61B5/307; A61B5/308; A61B5/302
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
219 words
An amplifying electrode pickup, particularly adapted for an electrocardiograph device comprising: container means having an open end portion; a cover means for said open end portion of said container means, said cover means being provided with an aperture therethrough; an electrically conductive sensor plate means supported in said aperture of said cover means; electronic means secured in said container means and electrically insulated from said container means and from said cover means; a multiconductor cable means secured in an aperture of said container means and electrically connected to said electronic means; said electronic means including an integrated impedance converter amplifier circuit means electrically connected to said conductive plate means, at least one voltage line constituting certain of the conductors of said multiconductor cable means being connected to said amplifier circuit means, a pair of resistor-capacitor circuit means connected to positive and negative voltage lines of said multiconductor cable means, an output signal line connected to said amplifier circuit means and constituting another conductor of said multiconductor cable means, a diode means connected between said positive voltage line and said output signal line, a second diode means connected between said negative voltage line and said output signal line; said multiconductor cable means additionally including electrical shielding means about said output signal line and about said positive and negative voltage lines.
Claim 2
Dependent Claim
219 words
An amplifying electrode pickup, particularly adapted for an electrocardiograph device comprising: container means having an open end portion; a cover means for said open end portion of said container means, said cover means being provided with an aperture therethrough; an electrically conductive sensor plate means supported in said aperture of said cover means; electronic means secured in said container means and electrically insulated from said container means and from said cover means; a multiconductor cable means secured in an aperture of said container means and electrically connected to said electronic means; said electronic means including an integrated impedance converter amplifier circuit means electrically connected to said conductive plate means, at least one voltage line constituting certain of the conductors of said multiconductor cable means being connected to said amplifier circuit means, a pair of resistor-capacitor circuit means connected to positive and negative voltage lines of said multiconductor cable means, an output signal line connected to said amplifier circuit means and constituting another conductor of said multiconductor cable means, a diode means connected between said positive voltage line and said output signal line, a second diode means connected between said negative voltage line and said output signal line; said multiconductor cable means additionally including electrical shielding means about said output signal line and about said positive and negative voltage lines.
Claim 3
Dependent Claim
26 words
The amplifying electrode pickup defined in claim 1, wherein said container means is constructed of metal and said cover means is constructed of a nonconductive material.
Claim 4
Dependent Claim
46 words
The amplifying electrode pickup defined in claim 1, additionally including means for securing said multiconductor cable means in said container means aperture, said securing means comprising a ferrulelike means located internally of said container means and a clamplike collar means located externally of said container means.
Claim 5
Dependent Claim
24 words
The amplifying electrode pickup defined in claim 1, additionally including a pluglike assembly means having one end of said multiconductor cable means secured thereto.
Claim 6
Dependent Claim
79 words
The amplifying electrode pickup defined in claim 1, wherein said multiconductor cable means comprises an outer insulating cover, an outer grounded shield constituting said electrical shielding means about said positive and negative voltage lines, said positive voltage line, said negative voltage line, a grounded lead, said output signal line, and an inner grounded shield constituting said electrical shielding means about said output signal line, said outer and inner grounded shields being connected for ground purposes to said grounded lead.
Claim 7
Dependent Claim
22 words
The amplifying electrode pickup defined in claim 1, wherein said electronic means is secured in said container means by appropriate potting material.
Claim 8
Dependent Claim
25 words
The amplifying electrode pickup defined in claim 1, wherein said sensor plate means is positively insulated by an insulator member secured to said container means.
Claim 9
Dependent Claim
24 words
The amplifying electrode pickup defined in claim 1, additionally including a resistor means positioned intermediate said sensor plate means and said amplifier circuit means.
Claim 10
Dependent Claim
43 words
The amplifying electrode pickup defined in claim 1, wherein said amplifier circuit means has an input impedance of about 10, 000 meg. ohms and an output impedance of about 1 ohm and is constructed to be biased by about a 10 nanoamp current.
Claim 11
Dependent Claim
35 words
The amplifying electrode pickup defined in claim 1, wherein said container means is constructed of metal, said sensor plate means is constructed of stainless steel, and said cover means is constructed of a insulating material.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-11-15 | 1975-05-17 | 1975-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-15 | 1979-05-17 | 1979-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-15 | 1983-05-17 | 1983-11-16 | $7700.00 | Window Closed / Lapsed |