Patent US5311872A successfully refreshed from Google Patents.
US5311872A
Expired / Lapsed
US
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Peripheral arterial monitoring instruments
Assignee: Ethicon Inc
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Filing: 1993-03-25
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Granted: 1994-05-17
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Expires: 2013-03-25
Abstract
Abstract A method and apparatus are described for determining characteristics of peripheral arterial volume and compliance. A blood pressure cuff is inflated and deflated around a limb of the body and pressure measurements are taken. The volume of air removed from the cuff is determined in a quantifiable manner, such as by expelling air through an orifice of known characteristics or by means of a volume of know characteristics. The detected pressures and volume of air, removed are used to compute oscillation volume, which in turn is used to display arterial capacity and compliance as a function of transmural pressure and time. Arterial capacity may be displayed in terms of arterial radius, arterial cross-sectional area, or arterial volume. A display of these characteristics as a function of pre and post anesthetic administration is particularly useful to the anesthesiologist and surgeon.
Inventors
- 👤 Howard P. Apple
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:02
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/02; A61B5/02007; A61B5/021; A61B5/022; A61B5/02225
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
85 words
Instrumentation for performing measurements of arterial volume comprising: an inflatable cuff; means, connected to said cuff, for inflating and deflating said cuff; means for detecting pressure levels within said cuff; and means, coupled to said cuff inflating and deflating means, for expelling air from said cuff in a quantified manner and means for computing said quantified amount of expelled air, including means of known volume for transferring pressurized air form said cuff; and means responsive to said computed amounts of air for computing arterial volume.
Claim 2
Dependent Claim
85 words
Instrumentation for performing measurements of arterial volume comprising: an inflatable cuff; means, connected to said cuff, for inflating and deflating said cuff; means for detecting pressure levels within said cuff; and means, coupled to said cuff inflating and deflating means, for expelling air from said cuff in a quantified manner and means for computing said quantified amount of expelled air, including means of known volume for transferring pressurized air form said cuff; and means responsive to said computed amounts of air for computing arterial volume.
Claim 3
Dependent Claim
47 words
Instrumentation according to claim 1, wherein said expelling means further includes a first value for selectively allowing the flow of air from said cuff into said means of known volume, and a second valve for selectively allowing the escape of air from said means of known volume.
Claim 4
Dependent Claim
72 words
Instrumentation according to claim 2, wherein said valves include actuating means for actuating said valves during a first time period during which the pressure in said cuff is reduced from a starting pressure level to an intermediate pressure level, and wherein said actuating means further actuate said valves during a second time period during which the pressure in said cuff is reduced from said intermediate pressure level to a final pressure level.
Claim 5
Dependent Claim
35 words
Instrumentation according to claim 3, wherein said first time period is a function of the volume of said means of known volume, and wherein said second time period is a function of said cuff pressure.
Claim 6
Dependent Claim
76 words
Instrumentation for performing measurements of arterial capacity comprising: an inflatable cuff; means, connected to said cuff, for inflating and deflating said cuff; means for detecting pressure levels within said cuff; means, coupled to said cuff inflating and deflating means, for expelling air from said cuff in a quantified manner and for computing said quantified amounts of expelled air; and means, responsive to said air expelling means and said pressure level detecting means, for computing arterial capacity.
Claim 7
Dependent Claim
76 words
Instrumentation for performing measurements of arterial capacity comprising: an inflatable cuff; means, connected to said cuff, for inflating and deflating said cuff; means for detecting pressure levels within said cuff; means, coupled to said cuff inflating and deflating means, for expelling air from said cuff in a quantified manner and for computing said quantified amounts of expelled air; and means, responsive to said air expelling means and said pressure level detecting means, for computing arterial capacity.
Claim 8
Dependent Claim
13 words
Instrumentation according to claim 5, further comprising means for displaying computed arterial capacity.
Claim 9
Dependent Claim
47 words
Instrumentation for performing measurements of arterial volume comprising: an inflatable cuff; means, connected to said cuff, for inflating and deflating said cuff; means for detecting cuff pressure; and means, coupled to said cuff inflating and deflating means, for determining incremental quantities of air removed from said cuff.
Claim 10
Dependent Claim
47 words
Instrumentation for performing measurements of arterial volume comprising: an inflatable cuff; means, connected to said cuff, for inflating and deflating said cuff; means for detecting cuff pressure; and means, coupled to said cuff inflating and deflating means, for determining incremental quantities of air removed from said cuff.
Claim 11
Dependent Claim
17 words
Instrumentation according to claim 7, wherein said means for detecting cuff pressure comprises a pulse pressure sensor.
Claim 12
Dependent Claim
16 words
Instrumentation according to claim 8, wherein said pulse pressure sensor detects oscillation pulses and cuff pressure.
Claim 13
Dependent Claim
25 words
Instrumentation according to claim 7, wherein said means for determining in incremental quantities of air removed from said cuff includes an orifice of predetermined characteristics.
Claim 14
Dependent Claim
21 words
Instrumentation according to claim 10, wherein said orifice includes means for periodically coupling said cuff to said inflating and deflating means.
Claim 15
Dependent Claim
24 words
Instrumentation according to claim 7, wherein said means for determining incremental quantities of air removed from said cuff includes a volume of predetermined characteristics.
Claim 16
Dependent Claim
24 words
Instrumentation according to claim 12, further including means for coupling said volume of predetermined characteristics to said cuff by said inflating and deflating means.
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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) | 1997-05-16 | 1997-11-15 | 1998-05-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-05-16 | 2001-11-15 | 2002-05-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-05-16 | 2005-11-15 | 2006-05-17 | $7700.00 | Window Closed / Lapsed |