Patent US4526574A successfully refreshed from Google Patents.
US4526574A
Expired / Lapsed
US
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Differential occlusion sensing method and apparatus
Assignee: Baxter International Inc
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Filing: 1983-05-23
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Granted: 1985-07-02
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Expires: 2003-05-23
Abstract
Abstract The present invention provides an accurate method and apparatus for sensing and monitoring any buildup in the downline tubing pressure in a fluid infusion system. The initial fluid pressure as indicated by the tubing location is sensed after a delay period and is utilized as a base pressure if it is within allowable limits. The infusion tubing location or pressure is then monitored and compared with the base location or pressure. The system will alarm if a preset differential location or pressure change is exceeded.
Inventors
- 👤 Michael O. Pekkarinen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:58
CPC Classifications
A; A61; A61M; A61M5/00; A61M5/14; A61M5/168; A61M5/16831; A61M5/16854; Y; Y10; Y10S; Y10S128/00; Y10S128/13
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
68 words
A method of sensing and monitoring downline fluid pressure in a fluid infusion system, comprising: providing a fluid tubing; providing a positive fluid flow in said tubing; sensing an initial base operating location of a single portion of said tubing; monitoring the tubing portion location; comparing the monitored location against the initial base operating location; and setting an alarm if said monitored location exceeds a predetermined location differential.
Claim 2
Independent Claim
68 words
A method of sensing and monitoring downline fluid pressure in a fluid infusion system, comprising: providing a fluid tubing; providing a positive fluid flow in said tubing; sensing an initial base operating location of a single portion of said tubing; monitoring the tubing portion location; comparing the monitored location against the initial base operating location; and setting an alarm if said monitored location exceeds a predetermined location differential.
Claim 3
Dependent Claim
19 words
The method as defined in claim 1 including: sensing said initial base operating location after a predetermined time delay.
Claim 4
Dependent Claim
35 words
The method as defined in claim 1 including: providing an absolute alarm location; comparing the monitored location against the absolute alarm location; and setting an alarm if said monitored location exceeds said absolute alarm location.
Claim 5
Dependent Claim
44 words
The method as defined in claim 1 including: providing an allowable initial location range; comparing said initial base operating location against said allowable initial location range; and setting an alarm if said initial base operating location is outside of said allowable initial location range.
Claim 6
Dependent Claim
49 words
The method as defined in claim 1 including: converting said initial base operating location and said monitored location to values indicative of the internal tubing pressure and representing an initial base pressure and a monitored pressure; and setting said alarm if said monitored pressure exceeds a predetermined pressure differential.
Claim 7
Dependent Claim
55 words
The method as defined in claim 5 including: sensing an initial infusion operating pressure after a predetermined time delay; providing an allowable initial pressure range; comparing said initial infusion operating pressure against said allowable initial pressure range; and setting an alarm if said initial infusion operating pressure is outside of said allowable initial pressure range.
Claim 8
Dependent Claim
35 words
The method as defined in claim 6 including: providing an absolute alarm pressure; comparing the monitored pressure against the absolute alarm pressure; and setting an alarm if said monitored pressure exceeds said absolute alarm pressure.
Claim 9
Independent Claim
75 words
An apparatus for sensing and monitoring downline fluid pressure in the fluid tubing of a fluid infusion system, comprising: means adapted to be coupled to the fluid tubing for sensing the location of a single portion thereof; means coupled to said sensing means for monitoring said sensed portion location and comparing it to an initial sensed infusion operating location; and means for setting an alarm if said sensed portion location exceeds a predetermined location differential.
Claim 10
Independent Claim
75 words
An apparatus for sensing and monitoring downline fluid pressure in the fluid tubing of a fluid infusion system, comprising: means adapted to be coupled to the fluid tubing for sensing the location of a single portion thereof; means coupled to said sensing means for monitoring said sensed portion location and comparing it to an initial sensed infusion operating location; and means for setting an alarm if said sensed portion location exceeds a predetermined location differential.
Claim 11
Dependent Claim
22 words
The apparatus as defined in claim 8 including: delay means for sensing said initial infusion operating location after a predetermined time delay.
Claim 12
Dependent Claim
34 words
The apparatus as defined in claim 8 including: means for comparing the monitored location against an absolute alarm location; and means for setting an alarm if said monitored location exceeds said absolute alarm location.
Claim 13
Dependent Claim
44 words
The apparatus as defined in claim 8 including: means for comparing said initial infusion operating location against a predetermined allowable initial location range; and means for setting an alarm if said initial infusion operating location is outside of said predetermined allowable initial location range.
Claim 14
Dependent Claim
24 words
The apparatus as defined in claim 8 wherein: said location sensing means include a fluid transducer adapted to be fluidly coupled to the tubing.
Claim 15
Dependent Claim
53 words
The apparatus as defined in claim 8 including: means for converting said sensed portion location and said monitored location to values indicative of the internal tubing pressure and representing an initial infusion operating pressure and a monitored pressure; and means for setting said alarm if said monitored pressure exceeds a predetermined pressure differential.
Claim 16
Dependent Claim
56 words
The apparatus as defined in claim 13 including: delay means for sensing said initial infusion operating pressure after a predetermined time delay; means for comparing said initial infusion operating pressure against an allowable initial pressure range; and means for setting an alarm if said initial infusion operating pressure is outside of said allowable initial pressure range.
Claim 17
Dependent Claim
34 words
The apparatus as defined in claim 14 including: means for comparing the monitored pressure against an absolute alarm pressure; and means for setting an alarm if said monitored pressure exceeds said absolute alarm pressure.
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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) | 1988-07-01 | 1988-12-31 | 1989-07-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-07-01 | 1992-12-31 | 1993-07-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-07-01 | 1996-12-31 | 1997-07-02 | $7700.00 | Window Closed / Lapsed |