US4373535A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Venting, self-stopping, aspirating syringe
Assignee: Individual
•
Filing: 1981-08-17
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Granted: 1983-02-15
•
Expires: 2001-08-17
Abstract
Abstract A syringe comprises a main tubular body, the body being open at one end and receiving a hypodermic needle at the other end, and a plunger, one end of the plunger extending into the body, through the open end thereof, the plunger having a longitudinal passageway therein permitting air flow therethrough. A fluid-tight seal is formed between the outside surface of the plunger and the inside surface of the syringe body. An air permeable filter membrane extends across the first end of the plunger, in the passageway, whereby the body can fill with blood, causing the air in the body to pass through the membrane to the open end of the body. Upon contact with the blood, the membrane swells and seals, automatically stopping the flow of blood. A one way valve extending across the passageway allows the syringe to be used to aspirate in the absence of natural blood pressure.
Inventors
- 👤 Michael D. Martell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:51
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/15; A61B5/153; A61B5/150007; A61B5/150015; A61B5/15003; A61B5/150206; A61B5/150221; A61B5/150236; A61B5/150244; A61B5/150259; A61B5/150374; A61B5/150381; A61B5/150389; A61B5/150503; A61B5/150732
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
117 words
A syringe assembly comprising: a tubular body open at one end and being adapted to receive a hypodermic needle at the other end thereof; a plunger, one end of which is adapted for insertion into said tubular body through said open end, said plunger having a longitudinal passageway for air flow therethrough; means for forming a fluid-tight seal between the outside surface of said plunger and the inside surface of said tubular body; an air permeable filter membrane extending across said passageway adjacent said one end of said plunger; and valve means extending across said passageway between said membrane and said open end of said tubular body for selectively permitting the passage of air through said passageway.
Claim 2
Dependent Claim
117 words
A syringe assembly comprising: a tubular body open at one end and being adapted to receive a hypodermic needle at the other end thereof; a plunger, one end of which is adapted for insertion into said tubular body through said open end, said plunger having a longitudinal passageway for air flow therethrough; means for forming a fluid-tight seal between the outside surface of said plunger and the inside surface of said tubular body; an air permeable filter membrane extending across said passageway adjacent said one end of said plunger; and valve means extending across said passageway between said membrane and said open end of said tubular body for selectively permitting the passage of air through said passageway.
Claim 3
Dependent Claim
22 words
A syringe assembly as recited in claim 1, wherein said seal forming means is positioned adjacent said one end of said plunger.
Claim 4
Dependent Claim
19 words
A syringe assembly as recited in claim 1, wherein said filter membrane is formed from a fibrous paper material.
Claim 5
Dependent Claim
39 words
A syringe assembly as recited in claim 1, wherein said valve means permits the passage of air through said passageway in one direction only, from said one end of said plunger to said open end of said tubular body.
Claim 6
Dependent Claim
102 words
A syringe assembly as recited in claim 4, wherein said passageway includes a first portion of a first diameter adjacent said one end of said plunger and a second portion of increased diameter between said first portion and the other end of said plunger thereby forming an internal shoulder connecting said first and second portions and wherein said valve means comprises a thin member of resilient material extending across said passageway against said shoulder, a portion of the circumference of said member being secured to said plunger, another portion of the circumference thereof being unconnected, so that said member forms a flap.
Claim 7
Dependent Claim
64 words
A plunger for use with a conventional syringe comprising: an elongated body having a longitudinal passageway therein for permitting air flow therethrough; an air permeable filter membrane extending across said passageway adjacent one end of said body; and valve means extending across said passageway between said membrane and the other end of said body for selectively permitting the passage of air through said passageway.
Claim 8
Dependent Claim
64 words
A plunger for use with a conventional syringe comprising: an elongated body having a longitudinal passageway therein for permitting air flow therethrough; an air permeable filter membrane extending across said passageway adjacent one end of said body; and valve means extending across said passageway between said membrane and the other end of said body for selectively permitting the passage of air through said passageway.
Claim 9
Dependent Claim
30 words
A plunger as recited in claim 6, further comprising means for forming a fluid-tight seal between the perimeter of said body and the inside surface of a tubular syringe body.
Claim 10
Dependent Claim
21 words
A plunger as recited in claim 7, wherein said seal forming means comprises at least one O-ring positioned around said perimeter.
Claim 11
Dependent Claim
38 words
A plunger as recited in claim 7, wherein said one end of said elongated body comprises a resilient material which is adapted to engage the inside surface of said tubular syringe body to provide said seal forming means.
Claim 12
Dependent Claim
18 words
A plunger as recited in claim 6, wherein said filter membrane is formed from a fibrous paper material.
Claim 13
Dependent Claim
35 words
A plunger as recited in claim 6, wherein said valve means permits passage of air through said passageway in one direction only, from said one end of said elongated body to the other end thereof.
Claim 14
Dependent Claim
102 words
A plunger as recited in claim 11, wherein said passageway includes a first portion of a first diameter adjacent said one end of said elongated body and a second portion of increased diameter between said first portion and the other end of said body thereby forming an internal shoulder connecting said first and second portions and wherein said valve means comprises a thin member of resilient material extending across said passageway against said shoulder, a portion of the circumference of said member being secured to said body, another portion of the circumference thereof being unconnected, so that said member forms a flap.
References Cited (Backward Citations)
US4327745A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-02-14 | 1986-08-16 | 1987-02-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-02-14 | 1990-08-16 | 1991-02-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-02-14 | 1994-08-16 | 1995-02-15 | $7700.00 | Window Closed / Lapsed |