Patent US4004587A successfully refreshed from Google Patents.
US4004587A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Parenteral liquid administration set with non-air blocking filter
Assignee: Baxter International Inc
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Filing: 1975-06-13
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Granted: 1977-01-25
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Expires: 1995-06-13
Abstract
Abstract A parenteral liquid administration set is provided which comprises flexible tubing, connection means with a parenteral liquid source at one end of the tubing, and means for connection to a blood vessel-penetrating member, such as a needle, at the other end of the tubing. In accordance with this invention, a filter, positioned in fluid communication with the bore of the tubing, comprises a housing, which carries first and second filter members in parallel flow position so that each increment of fluid flow through the tubing passes through one or the other of the filter members. The first filter member is hydrophilic, to permit the passage of solution under normal administration conditions. The second filter member is hydrophobic, to permit the passage of gas after wetting of the filter members. Accordingly, the filter members, which are closed from the exterior by the administration set, cannot airblock by the accumulation of air bubbles immediately upstream of the filter members.
Inventors
- 👤 Thurman Sheldon Jess
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:12
CPC Classifications
A; A61; A61M; A61M5/00; A61M5/14; A61M5/165; A61M2005/1652; Y; Y10; Y10S; Y10S210/00; Y10S210/928
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
137 words
In a fluid flow apparatus which comprises a flow conduit means adapted for connection to a liquid source, and a filter positioned in communication with said flow conduit, the improvement comprising, in combination: said filter comprising a housing, said housing carrying a first filter member and a separate, second filter member, in parallel flow position, whereby each increment of fluid flow through said flow conduit passes through one of said filter members, said first filter member being hydrophilic in nature to permit passage of aqueous liquid under normal liquid administration conditions, said second filter member being hydrophobic in nature to permit the passage of gas after said filter members have been in contact with aqueous liquid, whereby air-blocking of said filter is prevented, said filter members being closed from the exterior, and physically spaced from each other.
Claim 2
Dependent Claim
137 words
In a fluid flow apparatus which comprises a flow conduit means adapted for connection to a liquid source, and a filter positioned in communication with said flow conduit, the improvement comprising, in combination: said filter comprising a housing, said housing carrying a first filter member and a separate, second filter member, in parallel flow position, whereby each increment of fluid flow through said flow conduit passes through one of said filter members, said first filter member being hydrophilic in nature to permit passage of aqueous liquid under normal liquid administration conditions, said second filter member being hydrophobic in nature to permit the passage of gas after said filter members have been in contact with aqueous liquid, whereby air-blocking of said filter is prevented, said filter members being closed from the exterior, and physically spaced from each other.
Claim 3
Dependent Claim
79 words
The parenteral liquid administration set of claim 1 in which said housing comprises a tubular member defining a pair of longitudinally extending windows positioned in diametrically opposite relation to each other, said first and second filter members being each positioned in a said longitudinally extending window in peripherally sealed relation thereto, whereby a path of fluid flow extends through the interior of said tubular housing, through said windows and said filter members, and through the bore of said tubing.
Claim 4
Dependent Claim
28 words
The fluid flow apparatus of claim 1 in which the pore size of said second filter member is less than the pore size of said first filter member.
Claim 5
Dependent Claim
17 words
The apparatus of claim 1 in which said filter is mounted in a parenteral liquid administration set.
Claim 6
Dependent Claim
79 words
The parenteral liquid administration set of claim 7 in which said housing comprises a tubular member defining a pair of longitudinally extending windows positioned in diametrically opposite relation to each other, said first and second filter members being each positioned in a said longitudinally extending window in peripherally sealed relation thereto, whereby a path of fluid flow extends through the interior of said tubular housing, through said windows and said filter members, and through the bore of said tubing.
Claim 7
Dependent Claim
166 words
In a parenteral liquid administration set which comprises tubing, means for connection of said set with a parenteral liquid source at one end of said tubing, means for connection of said set to a blood vesselpenetrating member at the other end of said tubing, and a filter positioned in communication with the bore of said tubing, the improvement comprising, in combination: said filter comprising a housing, said housing carrying a first filter member, and a separate, second filter member, in parallel flow position whereby each increment of fluid flow through said bore passes through one of said filter members, said first filter member being hydrophilic in nature to permit the passage of aqueous liquid under normal parenteral liquid administration conditions, said second filter member being hydrophobic in nature to permit the passage of gas after said filter members have been in contact with aqueous liquid, whereby air-blocking of said filter is prevented, said filter means being closed from the exterior, and physically spaced from each other.
Claim 8
Dependent Claim
166 words
In a parenteral liquid administration set which comprises tubing, means for connection of said set with a parenteral liquid source at one end of said tubing, means for connection of said set to a blood vesselpenetrating member at the other end of said tubing, and a filter positioned in communication with the bore of said tubing, the improvement comprising, in combination: said filter comprising a housing, said housing carrying a first filter member, and a separate, second filter member, in parallel flow position whereby each increment of fluid flow through said bore passes through one of said filter members, said first filter member being hydrophilic in nature to permit the passage of aqueous liquid under normal parenteral liquid administration conditions, said second filter member being hydrophobic in nature to permit the passage of gas after said filter members have been in contact with aqueous liquid, whereby air-blocking of said filter is prevented, said filter means being closed from the exterior, and physically spaced from each other.
Claim 9
Dependent Claim
26 words
The parenteral liquid administration set of claim 6 in which said first and second filter member each define an area of less than 0.5 square centimeter.
Claim 10
Dependent Claim
79 words
The parenteral liquid administration set of claim 6 in which said housing comprises a tubular member defining a pair of longitudinally extending windows positioned in diametrically opposite relation to each other, said first and second filter members being each positioned in a said longitudinally extending window in peripherally sealed relation thereto, whereby a path of fluid flow extends through the interior of said tubular housing, through said windows and said filter members, and through the bore of said tubing.
Claim 11
Dependent Claim
29 words
The parenteral liquid administration set of claim 6 in which the pore size of said second filter member is less than the pore size of said first filter member.
Claim 12
Dependent Claim
169 words
In a fluid flow apparatus which comprises a flow conduit means adapted for connection to a liquid source and a filter positioned in communication with said flow conduit, the improvement comprising, in combination: said filter comprising a housing, said housing carrying a first filter member, and a separate, second filter member, in parallel flow position, whereby each increment of fluid flow through said flow conduit passes through one of said filter members, said first filter member being hydrophilic in nature to permit passage of aqueous liquid under normal parenteral liquid administration conditions, said second filter member being hydrophobic in nature to permit the passage of gas after said filter members have been in contact with aqueous liquid, the pore size of said first filter member being from 1 to 5 microns, as measured by the minimum size of the particles retained, while said second filter member exhibits a pore size of less than the pore size of said first filter member, said filter members being closed from the exterior.
Claim 13
Dependent Claim
169 words
In a fluid flow apparatus which comprises a flow conduit means adapted for connection to a liquid source and a filter positioned in communication with said flow conduit, the improvement comprising, in combination: said filter comprising a housing, said housing carrying a first filter member, and a separate, second filter member, in parallel flow position, whereby each increment of fluid flow through said flow conduit passes through one of said filter members, said first filter member being hydrophilic in nature to permit passage of aqueous liquid under normal parenteral liquid administration conditions, said second filter member being hydrophobic in nature to permit the passage of gas after said filter members have been in contact with aqueous liquid, the pore size of said first filter member being from 1 to 5 microns, as measured by the minimum size of the particles retained, while said second filter member exhibits a pore size of less than the pore size of said first filter member, said filter members being closed from the exterior.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-01-25 | 1980-07-26 | 1981-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-01-25 | 1984-07-26 | 1985-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-01-25 | 1988-07-26 | 1989-01-25 | $7700.00 | Window Closed / Lapsed |