US3714939A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Analog signal selective-peak sampler system for blood pressure signals
Assignee: American Optical Corp
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Filing: 1970-06-01
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Granted: 1973-02-06
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Expires: 1990-06-01
Abstract
Abstract A system for sampling selected peak values of an analog signal. A system is disclosed for detecting peak occurrences of a signal and for triggering a device which operates on the signal. One such device described herein is a numerical display device. The system includes means for limiting the repetition rate of peakindicating trigger pulses to a rate between upper and lower predetermined rate-limits. The system can be used in various applications and is particularly useful in the numerical display of systolic pressure as disclosed herein. The repetition rate limits employed herein are compatible with the ability of the human eye and brain to sense and absorb visual numerical information.
Inventors
- 👤 C Day
- 👤 W Grace
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:01
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/02; A61B5/021; A61B5/0215; A61B5/72; A61B5/7235; A61B5/7239
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
191 words
A system for repetitively sampling selected peak values of an analog signal which represents pressure in a subject''s body said signal comprising a series of double peaks, the first peak of each of said double peak being a systolic peak and the second peak of each of said double peak being a lower dicrotic notch peak, said system comprising: an electronic measurement device; means for applying said signal to said device; detecting means responsive to said signal for detecting occurrences of said peaks, said detecting means including bypass means for bypassing detection of each said lower dicrotic notch peak, an amplifier, means for applying said signal to an input of said amplifier, and feedback means connected between input and output of said amplifier for abruptly changing gain of said amplifier in response to occurrence of peaks of said signal; and command means responsive to the operation of said detecting means for providing successive readout command signals to said device made to measure a value of said signal occurring substantially simultaneously with each of said command signals, said command means including limiting means for limiting the repetition rate of said command signals.
Claim 2
Independent Claim
191 words
A system for repetitively sampling selected peak values of an analog signal which represents pressure in a subject''s body said signal comprising a series of double peaks, the first peak of each of said double peak being a systolic peak and the second peak of each of said double peak being a lower dicrotic notch peak, said system comprising: an electronic measurement device; means for applying said signal to said device; detecting means responsive to said signal for detecting occurrences of said peaks, said detecting means including bypass means for bypassing detection of each said lower dicrotic notch peak, an amplifier, means for applying said signal to an input of said amplifier, and feedback means connected between input and output of said amplifier for abruptly changing gain of said amplifier in response to occurrence of peaks of said signal; and command means responsive to the operation of said detecting means for providing successive readout command signals to said device made to measure a value of said signal occurring substantially simultaneously with each of said command signals, said command means including limiting means for limiting the repetition rate of said command signals.
Claim 3
Independent Claim
191 words
A system for repetitively sampling selected peak values of an analog signal which represents pressure in a subject''s body said signal comprising a series of double peaks, the first peak of each of said double peak being a systolic peak and the second peak of each of said double peak being a lower dicrotic notch peak, said system comprising: an electronic measurement device; means for applying said signal to said device; detecting means responsive to said signal for detecting occurrences of said peaks, said detecting means including bypass means for bypassing detection of each said lower dicrotic notch peak, an amplifier, means for applying said signal to an input of said amplifier, and feedback means connected between input and output of said amplifier for abruptly changing gain of said amplifier in response to occurrence of peaks of said signal; and command means responsive to the operation of said detecting means for providing successive readout command signals to said device made to measure a value of said signal occurring substantially simultaneously with each of said command signals, said command means including limiting means for limiting the repetition rate of said command signals.
Claim 4
Independent Claim
191 words
A system for repetitively sampling selected peak values of an analog signal which represents pressure in a subject''s body said signal comprising a series of double peaks, the first peak of each of said double peak being a systolic peak and the second peak of each of said double peak being a lower dicrotic notch peak, said system comprising: an electronic measurement device; means for applying said signal to said device; detecting means responsive to said signal for detecting occurrences of said peaks, said detecting means including bypass means for bypassing detection of each said lower dicrotic notch peak, an amplifier, means for applying said signal to an input of said amplifier, and feedback means connected between input and output of said amplifier for abruptly changing gain of said amplifier in response to occurrence of peaks of said signal; and command means responsive to the operation of said detecting means for providing successive readout command signals to said device made to measure a value of said signal occurring substantially simultaneously with each of said command signals, said command means including limiting means for limiting the repetition rate of said command signals.
Claim 5
Dependent Claim
44 words
A system as recited in claim 1 and wherein said limiting means includes minimum limiting means for limiting the repetition rate of said readout signals to a predetermined minimum rate in response to said detecting means not detecting presence of peaks of said signal.
Claim 6
Dependent Claim
86 words
A system as recited in claim 1 and wherein said command means comprises: threshold means responsive to said detecting means not detecting presence of peaks of said signal for providing and maintaining a substantially constant value of threshold potential; oscillating means responsive to said threshold means for providing a repetitive wave having a minimum frequency in response to said constant value; pulse means controlled by said oscillating means for providing pulses having said minimum frequency; and, conducting means for conducting said pulses to said display device.
Claim 7
Dependent Claim
48 words
A system as recited in claim 1 and wherein said limiting means includes maximum limiting means for limiting the repetition rate of said readout signals to an approximate maximum rate in response to said detecting means detecting presence of peaks of said signal above a predetermined maximum rate.
Claim 8
Dependent Claim
82 words
A system as recited in claim 4 and wherein said command means comprises: threshold means responsive to said detecting means detecting presence of said maximum rate signal peaks for providing and maintaining a minimum average value of threshold potential; oscillating means for providing a repetitive wave having a maximum frequency in response to saId minimum average value; pulse means controlled by said oscillating means for providing pulses having said maximum frequency; and conducting means for conducting said pulses to said display device.
Claim 9
Dependent Claim
88 words
A system as recited in claim 1 and wherein said command means further comprises: threshold means for providing a threshold potential; threshold changing means responsive to the operation of said detecting means for changing said threshold potential to a lower threshold potential; oscillating means for providing a repetitive wave having a variable frequency controlled by said threshold means and by said threshold changing means; pulse means connected to said oscillating means for providing pulses having said variable frequency; and, conducting means for conducting said pulses to said device.
Claim 10
Dependent Claim
16 words
A system as recited in claim 6 and wherein said threshold means comprises a voltage divider.
Claim 11
Dependent Claim
53 words
A system as recited in claim 7 and wherein said threshold changing means comprises an electronic switch, an impedance element in series connection with said switch, said switch and said element being in parallel connection with one leg of said divider, and means for operating said switch in response to said detecting means.
Claim 12
Dependent Claim
19 words
A system as recited in claim 6 and wherein said pulse means comprises resistor means for developing said pulses.
Claim 13
Dependent Claim
65 words
A system as recited in claim 1 and wherein said feedback means comprises: a combination of a diode in connection with a resistor one end of said combination being connected to the output of said amplifier, the other end of said combination being connected to the input of said amplifier; and a capacitor connected from the junction of said resistor and said diode to ground.
Claim 14
Dependent Claim
89 words
A system as recited in claim 1 and wherein said feedback means comprises: a transistor; a resistor, one end of said resistor connected to an emitter of said transistor, the base of said transistor connected to the output of said amplifier and the other end of said resistor connected to an input of said amplifier; a source of potential; a second resistor connected from the collector of said transistor to said source of potential; and a capacitor connected from the junction of said resistor and said emitter to ground.
Claim 15
Dependent Claim
17 words
A system as recited in claim 1 and wherein said measurement device is a numerical display device.
Claim 16
Independent Claim
260 words
A system for repetitively sampling selected peak values of an analog signal which represents the beating action of a subject''s heart, said system comprising: an electronic measurement device; means for applying said signal to said device; detecting means responsive to said signal for detecting occurrences of said peaks, said detecting means including means for determining certain of said peaks whose amplitudes are below a predetermined decreasing amplitude profile initiated by the detection of each of said peaks above said profile, bypass means for bypassing detection of said certain of said peaks, said bypass means including means for repetitively generating a series of thresholds, each of said thresholds decreasing from a variable high value to a variable low value in a continuous manner, each said high value coinciding with one of said peaks, means for comparing each of said peaks occurring after one of said high values with a first threshold whose high value is said one of said high values, means for ignoring said certain of said peaks having amplitude values less than the corresponding instantaneous values of said first threshold and, means for terminating said first threshold at said low value upon occurrence of a signal value greater than the corresponding instantaneous value of said first threshold; and command means responsive to the operation of said detecting means for providing successive readout command signals to said device made to measure a value of said signal occurring substantially simultaneously with each of said command signals, said commaNd means including limiting means for limiting the repetition rate of said command signals.
Claim 17
Independent Claim
260 words
A system for repetitively sampling selected peak values of an analog signal which represents the beating action of a subject''s heart, said system comprising: an electronic measurement device; means for applying said signal to said device; detecting means responsive to said signal for detecting occurrences of said peaks, said detecting means including means for determining certain of said peaks whose amplitudes are below a predetermined decreasing amplitude profile initiated by the detection of each of said peaks above said profile, bypass means for bypassing detection of said certain of said peaks, said bypass means including means for repetitively generating a series of thresholds, each of said thresholds decreasing from a variable high value to a variable low value in a continuous manner, each said high value coinciding with one of said peaks, means for comparing each of said peaks occurring after one of said high values with a first threshold whose high value is said one of said high values, means for ignoring said certain of said peaks having amplitude values less than the corresponding instantaneous values of said first threshold and, means for terminating said first threshold at said low value upon occurrence of a signal value greater than the corresponding instantaneous value of said first threshold; and command means responsive to the operation of said detecting means for providing successive readout command signals to said device made to measure a value of said signal occurring substantially simultaneously with each of said command signals, said commaNd means including limiting means for limiting the repetition rate of said command signals.
References Cited (Backward Citations)
US2815748A
Cited
US3174478A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-02-06 | 1976-08-07 | 1977-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-06 | 1980-08-07 | 1981-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-06 | 1984-08-07 | 1985-02-06 | $7700.00 | Window Closed / Lapsed |