US4193399A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self venting plug for venous entry unit
Assignee: Baxter International Inc
•
Filing: 1977-07-08
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Granted: 1980-03-18
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Expires: 1997-07-08
Abstract
Abstract The specification discloses a self venting plug for a venous entry unit which is a porous plastic body adapted to be removably seated in a hollow flashback chamber. The plug comprises an open pored plastic having a pore size on the order of 10-15 microns, and provides a flow path for venting air from the flashback chamber while inhibiting flow of blood from the chamber. The plug may be used, for example, with over-the-needle and through-the-needle catheter units employing piercing needles, and may be used to anchor a stylet for stiffening a catheter to be forwarded into the body.
Inventors
- 👤 Thomas P. Robinson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:31
CPC Classifications
A; A61; A61M; A61M25/00; A61M25/01; A61M25/06; A61M25/0693; Y; Y10; Y10S; Y10S604/00; Y10S604/90
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
123 words
In a venous entry unit having a hollow needle and a hollow flashback chamber proximal of the needle in fluid communication therewith for obtaining a visual indication of blood vessel entry by flow of blood into the chamber, the chamber having a proximal opening, the improvement comprising: a self venting plug removably seated in the proximal opening of the flashback chamber and sealingly engaging the inside surface of the flashback chamber adjacent the opening, said plug having as its major portion an integrally formed body of solid porous plastic material with pores therein of predetermined size to provide a flow path for air from the chamber outwardly through the plug while preventing the flow of blood outwardly from said chamber through said plug.
Claim 2
Dependent Claim
123 words
In a venous entry unit having a hollow needle and a hollow flashback chamber proximal of the needle in fluid communication therewith for obtaining a visual indication of blood vessel entry by flow of blood into the chamber, the chamber having a proximal opening, the improvement comprising: a self venting plug removably seated in the proximal opening of the flashback chamber and sealingly engaging the inside surface of the flashback chamber adjacent the opening, said plug having as its major portion an integrally formed body of solid porous plastic material with pores therein of predetermined size to provide a flow path for air from the chamber outwardly through the plug while preventing the flow of blood outwardly from said chamber through said plug.
Claim 3
Dependent Claim
22 words
The unit of claim 1, wherein the pore size of said porous material is on the order of ten to fifteen microns.
Claim 4
Dependent Claim
27 words
The unit of claim 1, wherein said plastic plug is a molded high molecular weight polyethylene having a pore size from about ten to about fifteen microns.
Claim 5
Dependent Claim
33 words
The unit of claim 1 wherein the unit is further characterized by the fact that a catheter surrounds the needle and is adapted to be forwarded over the needle into a blood vessel.
Claim 6
Dependent Claim
27 words
The unit of claim 1 wherein the unit is further characterized by the fact that a catheter is carried in the hollow needle and is forwardable therethrough.
Claim 7
Dependent Claim
26 words
The unit of claim 5 wherein a catheter stylet is positioned in the catheter and is anchored at its proximal end by the self venting plug.
Claim 8
Dependent Claim
35 words
The unit of claim 6 wherein the body of porous plastic material is fitted within a jacket which forms the exterior of the plug, and the body extends for substantially the length of the plug.
Claim 9
Dependent Claim
96 words
A self venting plug adapted to be removably seated in the tapered opening of a flashback chamber in a venous entry unit, which comprises: an integral body of porous plastic having open pores therein of predetermined size to provide a flow path through said body for air while inhibiting the flow of blood therethrough from the flashback chamber; said body having a smoothly tapered forward portion configured for sealing engagement with the interior of said flashback chamber, a relatively enlarged rear portion, and a forwardly facing shoulder portion located between the forward and rear body portions.
Claim 10
Dependent Claim
96 words
A self venting plug adapted to be removably seated in the tapered opening of a flashback chamber in a venous entry unit, which comprises: an integral body of porous plastic having open pores therein of predetermined size to provide a flow path through said body for air while inhibiting the flow of blood therethrough from the flashback chamber; said body having a smoothly tapered forward portion configured for sealing engagement with the interior of said flashback chamber, a relatively enlarged rear portion, and a forwardly facing shoulder portion located between the forward and rear body portions.
Claim 11
Dependent Claim
24 words
The plug of claim 7, wherein the plug is a molded polyethylene having a pore size of from about ten to about fifteen microns.
Claim 12
Dependent Claim
24 words
The plug of claim 8, wherein the body of porous plastic material is fitted within a jacket which forms the exterior of the plug.
Claim 13
Dependent Claim
121 words
In a venous entry unit having a hollow needle and a hollow flashback chamber proximal of the needle in fluid communication therewith for obtaining a visual indication of blood vessel entry by flow of blood into the chamber, the chamber having a proximal opening, the improvement comprising: an integrally formed porous plastic self venting plug seated in the proximal opening of the flashback chamber and engaging the inside surface of the flashback chamber adjacent the opening, said plug having open pores therein of predetermined size to provide flow path for air from the chamber outwardly through the plug while preventing the flow of blood therethrough and having a smooth distal portion for sealingly engaging the inside surface of the flashback chamber.
Claim 14
Dependent Claim
121 words
In a venous entry unit having a hollow needle and a hollow flashback chamber proximal of the needle in fluid communication therewith for obtaining a visual indication of blood vessel entry by flow of blood into the chamber, the chamber having a proximal opening, the improvement comprising: an integrally formed porous plastic self venting plug seated in the proximal opening of the flashback chamber and engaging the inside surface of the flashback chamber adjacent the opening, said plug having open pores therein of predetermined size to provide flow path for air from the chamber outwardly through the plug while preventing the flow of blood therethrough and having a smooth distal portion for sealingly engaging the inside surface of the flashback chamber.
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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) | 1983-03-18 | 1983-09-17 | 1984-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-03-18 | 1987-09-17 | 1988-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-03-18 | 1991-09-17 | 1992-03-18 | $7700.00 | Window Closed / Lapsed |