US4232373A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Compensation of fluidic transducers
Assignee: Rhode Island Department of Elementary and Secondary Education
•
Filing: 1978-04-14
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Granted: 1980-11-04
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Expires: 1998-04-14
Abstract
Abstract The output indications of fluid-filled transducers are compensated by filtering under the control of error analyser signals. In particular, the pressure waveform of a fluid-filled catheter is sampled and used to produce error signals that control a digital filter for the samples in order to compensate for measurement errors that are attributable to the physical characteristics of the catheter.
Inventors
- 👤 Leland B. Jackson
- 👤 Dov Jaron
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 16:36
CPC Classifications
H; H03; H03H; H03H17/00; H03H17/02; H03H17/0248; A; A61; A61B; A61B5/00; A61B5/02; A61B5/021; A61B5/0215
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
59 words
The method of compensating digitized pressure waveform output indicators of a fluid-filled catheter transducer which comprises the steps of: (a) generating from the digitized pressure waveform output indications pole signals that are associated with the fluid-filled catheter; and, (b) inverse filtering the digitized pressure waveform output indications under the control of said pole signals to cancel said pole signals.
Claim 2
Independent Claim
59 words
The method of compensating digitized pressure waveform output indicators of a fluid-filled catheter transducer which comprises the steps of: (a) generating from the digitized pressure waveform output indications pole signals that are associated with the fluid-filled catheter; and, (b) inverse filtering the digitized pressure waveform output indications under the control of said pole signals to cancel said pole signals.
Claim 3
Dependent Claim
19 words
The method of claim 1 wherein the digitized pressure waveform is stored in a digital memory before being filtered.
Claim 4
Dependent Claim
39 words
The method of claim 1 wherein the generating step includes the generation of covarient signals from the digitized waveform, the generation of coefficient signals from said covarient signals, and the generation of said pole signals from said coefficient signals.
Claim 5
Dependent Claim
19 words
The method of claim 1 wherein the filter control signals are generated from selected ones of said pole signals.
Claim 6
Dependent Claim
19 words
The method of claim 4 wherein said pole signals are selected from those having the largest natural frequency components.
Claim 7
Dependent Claim
16 words
The method of claim 5 wherein the selected pole signals are those with the least damping.
Claim 8
Dependent Claim
16 words
The method of claim 4 wherein the number of pole signals is either two or four.
Claim 9
Dependent Claim
55 words
Apparatus for compensating digitized pressure waveform output indications of a fluid-filled catheter transducer which comprises: means for generating from said digitized pressure waveform output indications pole signals associated with the fluid-filled catheter; and, means for inverse filtering the digitized pressure waveform output indications under the control of said pole signals to cancel said pole signals.
Claim 10
Dependent Claim
55 words
Apparatus for compensating digitized pressure waveform output indications of a fluid-filled catheter transducer which comprises: means for generating from said digitized pressure waveform output indications pole signals associated with the fluid-filled catheter; and, means for inverse filtering the digitized pressure waveform output indications under the control of said pole signals to cancel said pole signals.
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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) | 1983-11-04 | 1984-05-05 | 1984-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-11-04 | 1988-05-05 | 1988-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-11-04 | 1992-05-05 | 1992-11-04 | $7700.00 | Window Closed / Lapsed |