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US4423738A
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Noninvasive blood pressure monitoring transducer
Assignee: SRI International Inc
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Filing: 1977-11-04
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Granted: 1984-01-03
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Expires: 1997-11-04
Abstract
Abstract Intra-arterial blood pressure is noninvasively measured and monitored by an electromechanical force sensor which is made up of an array of individual force sensing elements, each of which has at least one dimension smaller than the lumen of the underlying artery wherein blood pressure is to be measured, and the individual force sensitive element which generates the waveform of maximum amplitude is used to monitor blood pressure.
Inventors
- 👤 Peter M. Newgard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:05
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/02; A61B5/021; A61B5/02108; A61B5/02116
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
166 words
In a system for the continuous external measurement of blood pressure in an underlying artery comprising at least one transducer array having a multiplicity of individual pressure sensitive elements, each of said individual pressure sensitive elements in said array having at least one dimension smaller than the lumen of the underlying artery in which blood pressure is measured and each individual pressure sensitive element being capable of producing a continuous waveform having an amplitude which is a function of blood pressure in an underlying artery, means responsive to the waveform output of all of the said individual pressure sensitive elements to select the single one of the said transducer elements which is best positioned in the arterial pressure sensing environment for blood pressure measurement, and means to utilize the output of only the said single one of the said individual pressure sensitive elements to measure blood pressure and produce a continuous waveform having an amplitude which is a function of blood pressure in an underlying artery.
Claim 2
Dependent Claim
166 words
In a system for the continuous external measurement of blood pressure in an underlying artery comprising at least one transducer array having a multiplicity of individual pressure sensitive elements, each of said individual pressure sensitive elements in said array having at least one dimension smaller than the lumen of the underlying artery in which blood pressure is measured and each individual pressure sensitive element being capable of producing a continuous waveform having an amplitude which is a function of blood pressure in an underlying artery, means responsive to the waveform output of all of the said individual pressure sensitive elements to select the single one of the said transducer elements which is best positioned in the arterial pressure sensing environment for blood pressure measurement, and means to utilize the output of only the said single one of the said individual pressure sensitive elements to measure blood pressure and produce a continuous waveform having an amplitude which is a function of blood pressure in an underlying artery.
Claim 3
Dependent Claim
42 words
In a system for the continuous external measurement of blood pressure in an artery as defined in claim 1, wherein each of said individual pressure sensitive elements in said array has at least the said one dimension less than approximately 0.50 mm.
Claim 4
Dependent Claim
61 words
In a system for the continuous external measurement of blood pressure in an artery as defined in claim 1, wherein the said means responsive to the waveform output of all of the said individual pressure sensitive elements comprises means for selecting the said only one of said individual pressure sensitive elements of said array which generates the waveform of maximum amplitude.
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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) | 1987-01-02 | 1987-07-04 | 1988-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-01-02 | 1991-07-04 | 1992-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-01-02 | 1995-07-04 | 1996-01-03 | $7700.00 | Window Closed / Lapsed |