US4252127A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Portable blood pressure recorder
Assignee: Iowa State University Research Foundation Inc
•
Filing: 1979-06-19
•
Granted: 1981-02-24
•
Expires: 1999-06-19
Abstract
Abstract A portable blood pressure recorder device for an ambulatory subject having an inflatable occluding cuff, a pump for inflating the cuff, a sensor for detecting Korotkoff sounds, a transducer for detecting pressure in the cuff, a variable voltage reference and signal circuitry system for encoding a pressure signal from the transducer into pressure segments, a recording system for combining the Korotkoff sounds with the encoded pressure segments, circuitry for activating and deactivating components of the device, and a data retrieval system for interpreting recorded data.
Inventors
- 👤 Ronnie L. Gemelke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:35
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/02; A61B5/021; A61B5/022; A61B5/02208; Y; Y10; Y10S; Y10S128/00; Y10S128/90
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
223 words
A portable blood pressure recorder device for an ambulatory subject comprising: an inflatable occluding cuff; pump means for inflating said cuff; sensor means for detecting Korotkoff sounds in an artery occluded by said cuff; transducer means for detecting pressure in said cuff; variable voltage reference means for encoding a pressure signal from said transducer means into pressure segments having upper and lower level limits; recording means for combining said Korotkoff sounds with said encoded pressure signal and processing the combined signal; switching circuitry means for setting the initial level of said variable voltage reference means and for activating and deactivating the signal means, the pumping means, and the recording means; signal circuitry means for comparing and summing the said signal from the transducer means and the signal from the variable voltage reference means to develop encoded pressure segments, said level of the variable voltage reference means being reset for the next lower pressure segment when the output of the transducer means exceeds the magnitude of the upper limit level and said level being subsequently reset to the next lower segment each time the output of the transducer means reaches the magnitude of said level until the lowest level is reached thereby deactivating the signal circuitry means and recording means; and decoder data retrieval means interconnected to said recording means for interpreting recorded data.
Claim 2
Dependent Claim
223 words
A portable blood pressure recorder device for an ambulatory subject comprising: an inflatable occluding cuff; pump means for inflating said cuff; sensor means for detecting Korotkoff sounds in an artery occluded by said cuff; transducer means for detecting pressure in said cuff; variable voltage reference means for encoding a pressure signal from said transducer means into pressure segments having upper and lower level limits; recording means for combining said Korotkoff sounds with said encoded pressure signal and processing the combined signal; switching circuitry means for setting the initial level of said variable voltage reference means and for activating and deactivating the signal means, the pumping means, and the recording means; signal circuitry means for comparing and summing the said signal from the transducer means and the signal from the variable voltage reference means to develop encoded pressure segments, said level of the variable voltage reference means being reset for the next lower pressure segment when the output of the transducer means exceeds the magnitude of the upper limit level and said level being subsequently reset to the next lower segment each time the output of the transducer means reaches the magnitude of said level until the lowest level is reached thereby deactivating the signal circuitry means and recording means; and decoder data retrieval means interconnected to said recording means for interpreting recorded data.
Claim 3
Dependent Claim
16 words
The device of claim 1 wherein said pump means includes a small orifice for pressure deflation.
Claim 4
Dependent Claim
26 words
The device of claim 1 wherein said sensor means includes a crystal microphone, a buffer amplifier, and noise-reduction means for reducing noise occurring between measured heartbeats.
Claim 5
Dependent Claim
46 words
The device of claim 3 wherein said noise-reduction means includes filtering means for eliminating direct current pressure signal from the output signal of said pressure transducer, means for identifying heartbeat induced pressure pulses, and means for transmitting a signal only when the heartbeat pulse is present.
Claim 6
Dependent Claim
38 words
The device of claim 1 wherein said variable voltage reference includes means for setting upper and lower level limits for said pressure segments, means for changing levels, and means for converting a digital signal to an analog signal.
Claim 7
Dependent Claim
20 words
The device of claim 1 wherein said recording means includes a summing amplifier, a voltage-to-frequency converter, and a tape recorder.
Claim 8
Dependent Claim
29 words
The device of claim 1 wherein said decoder data retrieval means includes comparator means, rectifying means, a frequency-to-voltage converter, filtering means for said recorded data, and a two-channel recorder.
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) | 1984-02-24 | 1984-08-25 | 1985-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-02-24 | 1988-08-25 | 1989-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-02-24 | 1992-08-25 | 1993-02-24 | $7700.00 | Window Closed / Lapsed |