US3800801A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heart stimulation apparatus and method of testing its installation
Assignee: SERDAL ELECTRON MED
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Filing: 1972-12-27
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Granted: 1974-04-02
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Expires: 1992-12-27
Abstract
Abstract Heart stimulation apparatus, which is constructed as an implantable unit including a heart stimulator, terminal electrodes of the heart stimulator connectable to a patient''s heart and a number of different shunts connected in parallel across the terminal electrodes each shunt having a separate remotely operable isolating switch, operable magnetically and a Zener diode, the known trigger voltage of each Zener diode being different. In use the shunts are remotely switched magnetically from the exterior of the patient, starting from the shunt of highest trigger voltage, until an electrocardiograph connected to the patient indicates a change in the voltage reading corresponding to the one of the known trigger voltages. It is thus possible to determine the value of the pulse potential of the heart stimulator. By switching in, for a short time, a shunt having relatively low trigger voltage, the stimulation threshold of the patient''s heart can be determined.
Inventors
- 👤 R Gaillard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:42
CPC Classifications
A; A61; A61N; A61N1/00; A61N1/18; A61N1/32; A61N1/36; A61N1/362; A61N1/37; A61N1/3706
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
119 words
A method of testing the pulse potential appearing at the terminal electrodes of a heart stimulator within the body of a patient, said method comprising the steps of providing a plurality of voltage triggered conducting shunts, each having a separate remotely operable isolating switch, and connected in parallel across said terminal electrodes, the known voltage to trigger each shunt being different, connecting an electrocardiograph to the patient, remotely switching said shunts in turn from the exterior of the patient, starting with a shunt of the highest trigger voltage, until the electrocardiograph indicates a change in the voltage reading corresponding to one of the known trigger voltages, and thus determining the value of the pulse potential of the heart stimulator.
Claim 2
Independent Claim
119 words
A method of testing the pulse potential appearing at the terminal electrodes of a heart stimulator within the body of a patient, said method comprising the steps of providing a plurality of voltage triggered conducting shunts, each having a separate remotely operable isolating switch, and connected in parallel across said terminal electrodes, the known voltage to trigger each shunt being different, connecting an electrocardiograph to the patient, remotely switching said shunts in turn from the exterior of the patient, starting with a shunt of the highest trigger voltage, until the electrocardiograph indicates a change in the voltage reading corresponding to one of the known trigger voltages, and thus determining the value of the pulse potential of the heart stimulator.
Claim 3
Dependent Claim
37 words
A method as claimed in claim 1, and further comprising the step of switching in for a short time, a shunt having a sufficiently low trigger voltage so as to test the stimulation threshold of the heart.
Claim 4
Dependent Claim
17 words
A method as claimed in claim 1, wherein the remote switching of the shunts is effected magnetically.
Claim 5
Dependent Claim
55 words
Heart stimulation apparatus comprising, as an implantable unit, a heart stimulator, terminal electrodes of said heart stimulator connectable to a patient''s heart, a plurality of shunts connected in parallel across said terminal electrodes, each shunt including a separate remotely operable isolating switch and triggerable conducting means, the known voltage to trigger each shunt being different.
Claim 6
Dependent Claim
55 words
Heart stimulation apparatus comprising, as an implantable unit, a heart stimulator, terminal electrodes of said heart stimulator connectable to a patient''s heart, a plurality of shunts connected in parallel across said terminal electrodes, each shunt including a separate remotely operable isolating switch and triggerable conducting means, the known voltage to trigger each shunt being different.
Claim 7
Dependent Claim
16 words
Heart stimulation apparatus as claimed in claim 4, wherein said triggerable conducting means comprise Zener diodes.
Claim 8
Dependent Claim
27 words
Heart stimulation apparatus as claimed in claim 4, wherein said remotely operable isolating switches each comprise a relay of the magnetically operable sealed tube flexible reed type.
Claim 9
Dependent Claim
33 words
Heart stimulation apparatus according to claim 6, wherein three relays are employed, which are arranged radially whereby the closing of said switches may be achieved by pivoting a magnet successively over said relays.
Claim 10
Dependent Claim
31 words
Heart stimulating apparatus as claimed in claim 6, wherein three relays are employed arranged in parallel directions to one another, the switching being effected by corresponding translational movement of the magnet.
Claim 11
Dependent Claim
44 words
Heart stimulating apparatus as claimed in claim 6, wherein three relays of different magnetic sensitivity are employed said relays being arranged in parallel, whereby the selective switching may be achieved by bringing the magnet closer or taking it further away from the patients body.
Claim 12
Dependent Claim
34 words
Heart stimulation apparatus as claimed in claim 6, wherein three relays of equivalent magnetic sensitivities are employed these being arranged so as to be adapted to be disposed at different depths in the patient.
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) | 1977-04-01 | 1977-10-01 | 1978-04-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-04-01 | 1981-10-01 | 1982-04-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-04-01 | 1985-10-01 | 1986-04-02 | $7700.00 | Window Closed / Lapsed |