US3677242A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air block prevention system
Assignee: Baxter International Inc
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Filing: 1971-01-11
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Granted: 1972-07-18
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Expires: 1991-01-11
Abstract
Abstract Air Block Prevention System for intravenous fluid administration sets or the like having a hydrophilic (i.e., wettable) filter utilizes a fluid filled purge line to permit air trapped above the filter when a solution container has run dry to be expressed from the fluid path so as to permit a continuation of fluid delivery to a patient without requiring withdrawal and reinsertion of the needle in the patient and without danger of air embolism.
Inventors
- 👤 Nat Shaye
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:55
CPC Classifications
A; A61; A61M; A61M5/00; A61M5/36; A61M5/14; A61M5/165; A61M2205/00; A61M2205/75; A61M2205/7527; A61M5/38
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
169 words
In an intravenous fluid administration apparatus having a drip chamber for receiving a Solution from a solution container and a downstream fluid carrying member for carrying the solution to a patient, the improvement comprising: a hydrophilic filter member in a filter chamber connected in the fluid path between said drip chamber and said downstream fluid carrying member, a purge line connected between said drip chamber and said filter chamber, purge line clamp means for having a closed position for permitting said purge line to be filled with said solution and maintained filled even though the solution container runs dry and the fluid path between said drip chamber and said filter member becomes filled with air, said purge line clamp means further having an open position permitting the release of the fluid in said purge line into said filter chamber after an exhausted solution container has been replaced so as to cause any air in said apparatus upstream of said filter member to be driven upwardly into said drip chamber.
Claim 2
Dependent Claim
169 words
In an intravenous fluid administration apparatus having a drip chamber for receiving a Solution from a solution container and a downstream fluid carrying member for carrying the solution to a patient, the improvement comprising: a hydrophilic filter member in a filter chamber connected in the fluid path between said drip chamber and said downstream fluid carrying member, a purge line connected between said drip chamber and said filter chamber, purge line clamp means for having a closed position for permitting said purge line to be filled with said solution and maintained filled even though the solution container runs dry and the fluid path between said drip chamber and said filter member becomes filled with air, said purge line clamp means further having an open position permitting the release of the fluid in said purge line into said filter chamber after an exhausted solution container has been replaced so as to cause any air in said apparatus upstream of said filter member to be driven upwardly into said drip chamber.
Claim 3
Dependent Claim
31 words
The intravenous fluid administration apparatus of claim 1 wherein said purge line includes a squeeze pump for assisting in initiating fluid flow therethrough when said purge line clamp means is released.
Claim 4
Dependent Claim
34 words
The intravenous fluid administration apparatus of claim 1 wherein said apparatus includes a clamp for stopping flow in said downstream fluid carrying member when said purge line clamp means is in its open position.
Claim 5
Dependent Claim
37 words
The intravenous fluid administration apparatus of claim 3 and further including a clamp in the fluid line between said drip chamber and said filter member for cutting off the flow in said line or adjustably regulating it.
Claim 6
Dependent Claim
28 words
The intravenous fluid administration apparatus of claim 3 wherein said purge line and said downstream fluid carrying member comprise two legs of a Y-connection to said filter chamber.
Claim 7
Dependent Claim
25 words
The intravenous fluid administration apparatus of claim 3 wherein said purge line and said downstream fluid carrying member are separately connected to said filter chamber.
Claim 8
Dependent Claim
23 words
The intravenous fluid administration apparatus of claim 3 wherein said purge line is connected to said filter chamber upstream of said filter member.
Claim 9
Dependent Claim
40 words
The intravenous fluid administration apparatus of claim 3 wherein said purge line clamp means and said clamp for stopping flow in said downstream fluid carrying member are integrally formed so that fluid can flow in one line at a time.
References Cited (Backward Citations)
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Cited
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Cited
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Cited
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Cited
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Cited
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Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-18 | 1976-01-17 | 1976-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-18 | 1980-01-17 | 1980-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-18 | 1984-01-17 | 1984-07-18 | $7700.00 | Window Closed / Lapsed |