US3983476A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Defibrillator testing device
Assignee: Individual
•
Filing: 1974-06-28
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Granted: 1976-09-28
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Expires: 1994-06-28
Abstract
Abstract The tester does not require any external power source as it derives its energy from the pulse being measured. It includes circuitry which produces a signal proportional to the energy without directly calculating the energy. This is accomplished by generating a current portional to E 2 with a diode network and then integrating the current in a capacitor thus indirectly measuring the true energy. The results are read directly upon a linear meter or can be connected to an oscilloscope or the like for inspection or recording. A bridge rectifier can be used so that the circuit is responsive to both polarities of input pulse or it can be made responsive only to the unipolar signal.
Inventors
- 👤 Francis Konopasek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:11
CPC Classifications
A; A61; A61N; A61N1/00; A61N1/18; A61N1/32; A61N1/38; A61N1/39; A61N1/3925; A61N1/3937; G; G01; G01R; G01R31/00; G01R31/50
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
164 words
A passive defibrillator tester, requiring no manipulation of controls, comprising in combination a standard test load resistor, means operatively connecting said test load resistor to the defibrillator being tested, whereby said defibrillator is discharged into said standard test load resistor, a passive square-law converter, circuit means operatively connecting said standard test load resistor to said converter, and a passive meter circuit operatively connected to said square-law converter, said meter circuit including a passive integrator circuit and a display meter to indicate the true delivered watt seconds input from the defibrillator being tested, into the standard test load resistor, and switch means between said standard test load resistor and said converter, a pair of variable resistors in parallel between said standard test load resistor and said switch means, said switch means placing one variable resistor or the other variable resistor in circuit thereby scaling said meter to one range or another range, said integrator circuit including a diode and capacitor network in said meter circuit.
Claim 2
Dependent Claim
164 words
A passive defibrillator tester, requiring no manipulation of controls, comprising in combination a standard test load resistor, means operatively connecting said test load resistor to the defibrillator being tested, whereby said defibrillator is discharged into said standard test load resistor, a passive square-law converter, circuit means operatively connecting said standard test load resistor to said converter, and a passive meter circuit operatively connected to said square-law converter, said meter circuit including a passive integrator circuit and a display meter to indicate the true delivered watt seconds input from the defibrillator being tested, into the standard test load resistor, and switch means between said standard test load resistor and said converter, a pair of variable resistors in parallel between said standard test load resistor and said switch means, said switch means placing one variable resistor or the other variable resistor in circuit thereby scaling said meter to one range or another range, said integrator circuit including a diode and capacitor network in said meter circuit.
Claim 3
Dependent Claim
21 words
The tester according to claim 1 which includes a bridge rectifier circuit in said tester for making said tester polarity insensitive.
Claim 4
Dependent Claim
25 words
The device according to claim 1 in which said standard test load resistor is adjustable within limits, and adjustable potentiometer means in said meter circuit.
Claim 5
Dependent Claim
25 words
The device according to claim 2 in which said standard test load resistor is adjustable within limits, and adjustable potentiometer means in said meter circuit.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-09-28 | 1980-03-29 | 1980-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-09-28 | 1984-03-29 | 1984-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-09-28 | 1988-03-29 | 1988-09-28 | $7700.00 | Window Closed / Lapsed |