US3901402A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stopper-piston
Assignee: Becton Dickinson and Co
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Filing: 1974-05-31
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Granted: 1975-08-26
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Expires: 1994-05-31
Abstract
Abstract An assembly adapted to receive blood for separation into a light liquid phase of serum or plasma and a heavy phase is disclosed. The assembly includes a self-sealing, pierceable, elastomeric stopper-piston member which is capable of acting as a slidable piston as well as a closure for holding a vacuum in an evacuated container for collecting blood. Means is provided which is capable of pushing the piston member downwardly in the container; the means having a pointed tubular member associated therewith which is capable of piercing the piston so as to provide a passage for conducting the separated light liquid phase from one side of the stopper-piston to the other side thereof.
Inventors
- 👤 Waldemar A Ayres
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 02:05
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/15; A61B5/150007; A61B5/150015; A61B5/15003; A61B5/150206; A61B5/150213; A61B5/150221; A61B5/150236; A61B5/150244; A61B5/150274; A61B5/150351; A61B5/150374; A61B5/150381; A61B5/150389; A61B5/150473; A61B5/150496; A61B5/150732; A61B5/150755; A61B5/153; A61B5/154; B; B01; B01L; B01L3/00; B01L3/50; B01L3/502; B01L3/5021; B01L3/50215; B01L3/508; B01L3/5082; B01L3/50825; G; G01; G01N; G01N33/00; G01N33/48; G01N33/483; G01N33/487; G01N33/49; G01N33/491; A61J; A61J1/00; A61J1/05; A61J1/14; A61J1/1406; B01L2200/00; B01L2200/06; B01L2200/0689; B01L2300/00; B01L2300/06; B01L2300/0672; B01L2400/00; B01L2400/04; B01L2400/0475; B01L2400/0478
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
216 words
A stopper-piston made of a self-sealing, elastomeric, pierceable material adapted to seal the open end of a blood collection container and capable of maintaining a vacuum therein prior to the collection of a blood sample, said stopper-piston comprising: a tubular body portion including sealing means positioned between the ends thereof and integrally formed therearound; said sealing means adapted to exert sufficient compressive forces against the inner wall of the collection container so as to hold a vacuum; a top surface formed at one end of said tubular body portion and capable of being pierced by a pointed tubular member; said top surface extending beyond said body portion to form a rim which is deformable and provides a second sealing means when the stopper-piston is pushed into said container to function as a piston; and said rim has a diameter substantially equal to the external diameter of said container; said body portion having at least three lobes formed at said other end so that when said stopper-piston is mounted in the open end of said blood collection container said lobes will compress inwardly toward the axis of the stopper-piston to provide supporting contact areas to maintain the stopper-piston in axial alignment when an axial force is exerted against the piston to move the piston into the container.
Claim 2
Dependent Claim
216 words
A stopper-piston made of a self-sealing, elastomeric, pierceable material adapted to seal the open end of a blood collection container and capable of maintaining a vacuum therein prior to the collection of a blood sample, said stopper-piston comprising: a tubular body portion including sealing means positioned between the ends thereof and integrally formed therearound; said sealing means adapted to exert sufficient compressive forces against the inner wall of the collection container so as to hold a vacuum; a top surface formed at one end of said tubular body portion and capable of being pierced by a pointed tubular member; said top surface extending beyond said body portion to form a rim which is deformable and provides a second sealing means when the stopper-piston is pushed into said container to function as a piston; and said rim has a diameter substantially equal to the external diameter of said container; said body portion having at least three lobes formed at said other end so that when said stopper-piston is mounted in the open end of said blood collection container said lobes will compress inwardly toward the axis of the stopper-piston to provide supporting contact areas to maintain the stopper-piston in axial alignment when an axial force is exerted against the piston to move the piston into the container.
Claim 3
Dependent Claim
24 words
The stopper-piston Of claim 1 wherein the sealing means includes a plurality of circumferentially spaced rings integrally formed between ends of said body portion.
Claim 4
Dependent Claim
18 words
The stopper-piston of claim 2 wherein said other end of said body portion is formed having three lobes.
Claim 5
Dependent Claim
52 words
The stopper-piston of claim 3 wherein said three lobes are separated 120*, each lobe being further separated by a venting channel, the sides of which are defined by the end surfaces of adjacent lobes, the base of said venting channel being inclined with respect to the longitudinal axis of said body portion.
Claim 6
Dependent Claim
34 words
The stopper-piston of claim 4 wherein the base of said venting channel is inclined 45*; the upper and outer edge portion of which terminates adjacent the lowermost sealing ring formed on said body portion.
Claim 7
Dependent Claim
23 words
The stopper-piston of claim 1 wherein a venting means is formed in said body portion, said venting means being positioned between adjacent lobes.
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) | 1978-08-25 | 1979-02-24 | 1979-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-25 | 1983-02-24 | 1983-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-25 | 1987-02-24 | 1987-08-26 | $7700.00 | Window Closed / Lapsed |