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Patent US3787767A successfully refreshed from Google Patents.
US3787767A
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Defibrillator output energy measuring circuit
Assignee: Pioneer Medical Systems Inc
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Filing: 1971-10-15
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Granted: 1974-01-22
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Expires: 1991-10-15
Abstract
Abstract A universal portable analyzer for defibrillators giving a direct readout, in watt-seconds, of electrical energy pulses regardless of wave shape and polarity. A voltage divider input attenuates the signal and feeds it through gain and buffer stages. A zero crossing detector gates switching networks for sequentially passing positive and negative signal components respectively to separate integrators which generate outputs proportional to the total positive and negative current of the input pulse. These outputs are stretched so that they occur simultaneously, are added together and squared to provide a signal porportional to power which is applied to a watt-second meter for direct readout. The solid state circuits include automatic ON-OFF control, and automatic zero reset at the beginning of each test cycle makes analyzer suited for use by non-technical personnel.
Inventors
- 👤 L Hammer
- 👤 C Reynolds
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:17
CPC Classifications
G; G01; G01R; G01R21/00; A; A61; A61N; A61N1/00; A61N1/18; A61N1/32; A61N1/38; A61N1/39; A61N1/3925; A61N1/3937
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
123 words
An energy analyzer for providing a direct readout of the total pulsed energy delivered by a defibrillator or the like energy source during a single operation comprising a frequency insensitive input circuit for receiving the output energy delivered by said energy source and developing an input signal representative of the total unfiltered energy thereof, means for isolating the positive and negative components of said developed signal from each other, means for integrating any positive and negative components of the developed signal to generate a signal correlated with the magnitude of such positive and negative components, means responsive to said generated signal for providing a direct readout of the total unfiltered positive and negative energy delivered by said energy source during said single operation.
Claim 2
Dependent Claim
123 words
An energy analyzer for providing a direct readout of the total pulsed energy delivered by a defibrillator or the like energy source during a single operation comprising a frequency insensitive input circuit for receiving the output energy delivered by said energy source and developing an input signal representative of the total unfiltered energy thereof, means for isolating the positive and negative components of said developed signal from each other, means for integrating any positive and negative components of the developed signal to generate a signal correlated with the magnitude of such positive and negative components, means responsive to said generated signal for providing a direct readout of the total unfiltered positive and negative energy delivered by said energy source during said single operation.
Claim 3
Dependent Claim
28 words
The analyzer of claim 1 wherein the isolating means includes gating switches and zero voltage detector for gating the switches for passing the positive and negative components selectively.
Claim 4
Dependent Claim
21 words
The analyzer of claim 2 wherein the zero voltage detector gates the switches for passing the positive and negative components sequentially.
Claim 5
Dependent Claim
17 words
The analyzer of claim 2 wherein the signal generating means includes means for squaring the generated signal.
Claim 6
Dependent Claim
19 words
The analyzer of claim 4 including means for automatically summing the signals corresponding to said positive and negative components.
Claim 7
Dependent Claim
21 words
The analyzer of claim 5 including means for stretching the signals corresponding to the positive and negative components prior to summing.
Claim 8
Dependent Claim
24 words
The analyzer of claim 1 including automatic means for turning the analyzer on and off at the beginning and end of each use thereof.
Claim 9
Dependent Claim
21 words
The analyzeR of claim 7 including automatic means for resetting the analyzer to zero at the beginning of each use thereof.
Claim 10
Dependent Claim
65 words
The analyzer of claim 1 wherein said input circuit includes a timing circuit providing for the passage of the input signal for a period of time at least equal to the interval of delivery of the pulsed energy by the energy source during a single operation to enable the developed signal to represent the total energy output of said energy source during said single operation.
Claim 11
Dependent Claim
51 words
The analyzer of claim 6 wherein the signal stretching means includes a time delay circuit to insure that the positive and negative components delivered to the automatic summing means coexist for the full interval of delivery of pulsed energy by said energy source to said input circuit during a single operation.
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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) | 1977-01-21 | 1977-07-23 | 1978-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-21 | 1981-07-23 | 1982-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-21 | 1985-07-23 | 1986-01-22 | $7700.00 | Window Closed / Lapsed |