US3833865A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heart simulator
Assignee: Individual
•
Filing: 1973-08-27
•
Granted: 1974-09-03
•
Expires: 1993-08-27
Abstract
Abstract An electronic circuit which generates an electric waveform which is similar to that produced by the human heart. The circuit simulates the heart pulse rate over a range of approximately 40200 pulse beats per second. A unijunction transistor oscillator generates pulses at a rate determined by the setting of a potentiometer and the pulses are shaped to simulate a heart beat by a transformer - RC circuit coupled to the oscillator output.
Inventors
- 👤 E Palmer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:45
CPC Classifications
G; G06; G06G; G06G7/00; G06G7/48; G06G7/60; A; A61; A61B; A61B5/00; A61B5/24; A61B5/316; A61B5/318; A61B5/319; H; H03; H03K; H03K3/00; H03K3/02; H03K3/35; H03K3/351; H03K5/00; H03K5/01
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
102 words
An electronic heart simulator which generates a waveform similar to that produced by the human heart for calibrating heart monitoring equipment, comprIsing: a source of DC voltage; a unijunction transistor oscillator connected to the source, said oscillator including a resistor connected to the base two electrode of the unijunction transistor across which the oscillator output pulse appears; a series combination of a capacitor and an inductor connected across said resistor; and, a transformer, the primary winding of which constitutes said inductor, and the secondary winding of which comprises means for coupling the simulated waveform to the equipment which is to be calibrated.
Claim 2
Dependent Claim
102 words
An electronic heart simulator which generates a waveform similar to that produced by the human heart for calibrating heart monitoring equipment, comprIsing: a source of DC voltage; a unijunction transistor oscillator connected to the source, said oscillator including a resistor connected to the base two electrode of the unijunction transistor across which the oscillator output pulse appears; a series combination of a capacitor and an inductor connected across said resistor; and, a transformer, the primary winding of which constitutes said inductor, and the secondary winding of which comprises means for coupling the simulated waveform to the equipment which is to be calibrated.
Claim 3
Dependent Claim
19 words
The electronic heart simulator of claim 1 wherein said oscillator further includes means for varying its output pulse frequency.
Claim 4
Dependent Claim
40 words
The electronic heart simulator of claim 2 wherein said frequency varying means comprises a series combination of a capacitor and a potentiometer connected across the source and having its junction point connected to the emitter electrode of the unijunction transistor.
Claim 5
Dependent Claim
14 words
The electronic heart simulator of claim 3 wherein said DC source is a battery.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-09-02 | 1978-03-04 | 1978-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-02 | 1982-03-04 | 1982-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-02 | 1986-03-04 | 1986-09-03 | $7700.00 | Window Closed / Lapsed |