US3706313A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Trapezoidal waveshape defibrillator
Assignee: Welch Allyn Protocol Inc
•
Filing: 1971-02-04
•
Granted: 1972-12-19
•
Expires: 1991-02-04
Abstract
Abstract A trapezoidal waveshape, which is known to be the best waveshape for defibrillating the heart, is produced by charging a capacitor, and by starting to discharge it through a silicon controlled rectifier to the load, namely, the body of the patient. Subsequently, a second SCR is used to short circuit the first SCR and load circuit to effect termination of the trapezoidal waveshape rapidly, i.e., effectively dumping the remainder of the charge.
Inventors
- 👤 Dean L Milani
- 👤 Richard G Kerwin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:23
CPC Classifications
A; A61; A61N; A61N1/00; A61N1/18; A61N1/32; A61N1/38; A61N1/39; A61N1/3904; A61N1/3906; A61N1/3912
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
118 words
Electric circuit means for discharging a substantially trapezoidal waveshape, comprising output means adapted to be connected to a resistive load such as a human body having a heart to be defibrillated, electrical energy storage means and a discharge circuit in series with said energy storage means and said output means, said discharge circuit comprising a resistor and a first controlled electronic gate substantially in parallel with said energy storage means and said output means, a shunting second controlled electronic gate, means for turning on said first controlled electronic gate to start discharge of electrical energy to said output means, and means for thereafter starting conduction of said second gate to short circuit said first gate and output means.
Claim 2
Dependent Claim
118 words
Electric circuit means for discharging a substantially trapezoidal waveshape, comprising output means adapted to be connected to a resistive load such as a human body having a heart to be defibrillated, electrical energy storage means and a discharge circuit in series with said energy storage means and said output means, said discharge circuit comprising a resistor and a first controlled electronic gate substantially in parallel with said energy storage means and said output means, a shunting second controlled electronic gate, means for turning on said first controlled electronic gate to start discharge of electrical energy to said output means, and means for thereafter starting conduction of said second gate to short circuit said first gate and output means.
Claim 3
Dependent Claim
18 words
Circuit means as set forth in claim 1, wherein each of said gates comprises a unidirectionally conductive gate.
Claim 4
Dependent Claim
17 words
Circuit means as set forth in claim 2, wherein each of said gates comprises a controlled rectifier.
Claim 5
Dependent Claim
17 words
Circuit means as set forth in claim 1, wherein said electrical energy storage means comprises a capacitor.
Claim 6
Dependent Claim
49 words
Circuit means as set forth in claim 1, wherein the means for starting conduction of said second gate includes means connected across said resistor sensitive to the voltage thereacross and further connected to said second gate to effect conduction thereof in accordance with the voltage developed across said resistor.
Claim 7
Dependent Claim
53 words
Circuit means as set forth in claim 5, wherein the means connected across said resistor comprises a series combination of a second resistor and a capacitor, said circuit means further including a transformer having the primary connected across said capacitor and the secondary connected to said second electronic gate to start firing thereof.
Claim 8
Dependent Claim
18 words
Circuit means as set forth in claim 6, wherein each of said gates comprises a unidirectionally conductive gate.
Claim 9
Dependent Claim
17 words
Circuit means as set forth in claim 7, wherein each of said gates comprises a controlled rectifier.
Claim 10
Dependent Claim
17 words
Circuit means as set forth in claim 8, wherein the electrical energy storage means comprises a capacitor.
Claim 11
Dependent Claim
120 words
Electric circuit means for discharging a substantially trapezoidal waveshape, comprising output means adapted to be connected to a resistive load such as a human body having a heart to be defibrillated, electrical energy storage means and a discharge circuit in series with said energy storage means and said output means, said discharge circuit comprising a resistor and a first electric switch means substantially in parallel with said energy storage means and said output means, a shunting second electric switch means, means for first rendering said first switch means conductive to start discharge of electrical energy to said output means, and means for thereafter starting conduction of said second electric switch means to short circuit said first gate and output means.
Claim 12
Dependent Claim
120 words
Electric circuit means for discharging a substantially trapezoidal waveshape, comprising output means adapted to be connected to a resistive load such as a human body having a heart to be defibrillated, electrical energy storage means and a discharge circuit in series with said energy storage means and said output means, said discharge circuit comprising a resistor and a first electric switch means substantially in parallel with said energy storage means and said output means, a shunting second electric switch means, means for first rendering said first switch means conductive to start discharge of electrical energy to said output means, and means for thereafter starting conduction of said second electric switch means to short circuit said first gate and output means.
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) | 1975-12-19 | 1976-06-19 | 1976-12-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-19 | 1980-06-19 | 1980-12-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-19 | 1984-06-19 | 1984-12-19 | $7700.00 | Window Closed / Lapsed |