US4188948A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter device
Assignee: Kendall Mcgraw Laboratories Inc
•
Filing: 1977-10-20
•
Granted: 1980-02-19
•
Expires: 1997-10-20
Abstract
Abstract A filter device for connecting in series with a parenteral liquid administration line delivering a medical liquid to a patient. The filter unit includes a housing with a filter member that is previous to liquid but impervious to gas, and a gas collection chamber. A nonpuncturable hypodermic needle guide structure on the unit aligns a hypodermic needle with the gas collection chamber and limits cocking of the needle to prevent puncture or damage to the filter member.
Inventors
- 👤 John A. Swinton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:05
CPC Classifications
B; B01; B01D; B01D19/00; B01D19/0031; A; A61; A61M; A61M5/00; A61M5/14; A61M5/165; A61M5/36; A61M2005/1657; A61M2205/00; A61M2205/75; A61M2205/7527; A61M5/38
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
121 words
A filter device for separating gas from a medical fluid or the like in which a housing has a filter element and a gas collection chamber, wherein the improvement comprises a tubular sleeve guide means in parallel relationship with the filter element, having a passage which is substantially longer than its cross-sectional dimension and which extends substantially the length of the housing, in communication with the gas collection chamber and having an extraction supporting a puncturable diaphragm at the end of said tubular sleeve opposite the gas collection chamber, said tubular sleeve providing means for aligning a gas extraction tool with the interior of the gas collection chamber while simultaneously preventing any contact between the extraction tool and the filter member.
Claim 2
Dependent Claim
121 words
A filter device for separating gas from a medical fluid or the like in which a housing has a filter element and a gas collection chamber, wherein the improvement comprises a tubular sleeve guide means in parallel relationship with the filter element, having a passage which is substantially longer than its cross-sectional dimension and which extends substantially the length of the housing, in communication with the gas collection chamber and having an extraction supporting a puncturable diaphragm at the end of said tubular sleeve opposite the gas collection chamber, said tubular sleeve providing means for aligning a gas extraction tool with the interior of the gas collection chamber while simultaneously preventing any contact between the extraction tool and the filter member.
Claim 3
Dependent Claim
64 words
The filter device as set forth in claim 1, wherein the housing is segregated by a filter element into a first unfiltered liquid chamber with an inlet port, and a second filtered liquid chamber having a liquid outlet port; and the gas collection chamber has a nonpuncturable abutment wall spaced from the filter member to limit the penetration depth of a gas extraction tool.
Claim 4
Dependent Claim
40 words
The filter device as set forth in claim 1, wherein the guide means includes the combined passages of a tubular adapter supporting a puncturable diaphragm at one end, and a tubular section on the housing which couples with the adapter.
Claim 5
Dependent Claim
59 words
The filter device as set forth in claim 1, wherein the device is connected in series with a parenteral liquid administration set; and there is in combination with the device a hypodermic syringe needle penetrating the extraction port, and said guide means prevents any cocking of the hypodermic needle to place it in close proximity with the filter member.
Claim 6
Dependent Claim
46 words
The filter device as set forth in claim 1, wherein the housing has an inlet port in axial alignment with an inlet tube structure; and the gas extraction port is connected to a tubular guide means that has an axis different from the liquid inlet port.
Claim 7
Dependent Claim
31 words
The filter device as set forth in claim 5, wherein the tubular guide means has an axis that is substantially parallel to but spaced from the axis of the inlet port.
Claim 8
Dependent Claim
70 words
The filter device as set forth in claim 9, wherein the housing includes an upper member having an external laterally extending flange about its periphery; and a lower member having an external laterally extending flange about its periphery; and the filter member is a membrane that is pervious to liquid but impervious to gas, said filter membrane being sandwiched between these external flanges; and means locking the two flanges together.
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) | 1983-02-18 | 1983-08-20 | 1984-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-02-18 | 1987-08-20 | 1988-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-02-18 | 1991-08-20 | 1992-02-19 | $7700.00 | Window Closed / Lapsed |