US3890237A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plasma separator {13 {0 cord stop type
Assignee: Becton Dickinson and Co
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Filing: 1974-02-27
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Granted: 1975-06-17
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Expires: 1994-02-27
Abstract
Abstract A blood collection and separator assembly of the type suitable for use in centrifuging blood to separate the plasma or serum, the light phase, from the cellular portion, the heavy phase. The assembly includes a collection container and a piston disposed therein for sealing off one phase from the other after centrifuging is terminated. The piston is formed having a specific gravity heavier than the light phase of the blood. The piston is slidably disposed in the container with its outer surfaces in sealing contact with the inner surface of the container and is provided with means which, under sufficient centrifugal force, permit the light phase of the blood to pass the piston as the piston moves down through the light phase while retaining sealing engagement with the inner surface of the container. Cord means interconnecting the piston and the top closure of the container stop the piston at a predetermined distance above the bottom of the container whereupon the piston serves as an impervious barrier between the two phases of the blood.
Inventors
- 👤 Joseph T Welch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 14:40
CPC Classifications
B; B01; B01L; B01L3/00; B01L3/50; B01L3/502; B01L3/5021; B01L3/50215
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
267 words
A separator assembly, capable of separating blood into its component phases of plasma or serum vs cellular portion, comprising: a. a container having first and second open ends, and adapted to receive blood for subsequent separation into a light phase and a heavy phase; b. first and second closures sealing both ends of the container, the first of said closures being formed from a self-sealing elastomeric material which is penetrable by a cannula through which blood to be separated is conducted into the container; c. a piston having a specific gravity relatively greater than the light phase of the blood and slidably mounted in the container, said piston having means on an outer surface in sealing engagement with an inner surface of the container, said sealing means being constructed and arranged to maintain said piston at a first position adjacent the second of said closures when subjected to a first centrifugal force and to disengage when subjected to a second greater centrifugal force so that when said container is subjected to said first centrifugal force the blood separates into its light phase and heavy phase but the piston stays in said first position and subsequently when said second greater centrifugal force is used the sealing means automatically disengages, the light phase thereby passing around the sealing means enabling the piston to move down through the light phase; and d. stop means comprising a cord of a predetermined length extending from said second closure to the piston whereby the piston when moving through the light phase will stop a predetermined distance from said first end of the container.
Claim 2
Dependent Claim
267 words
A separator assembly, capable of separating blood into its component phases of plasma or serum vs cellular portion, comprising: a. a container having first and second open ends, and adapted to receive blood for subsequent separation into a light phase and a heavy phase; b. first and second closures sealing both ends of the container, the first of said closures being formed from a self-sealing elastomeric material which is penetrable by a cannula through which blood to be separated is conducted into the container; c. a piston having a specific gravity relatively greater than the light phase of the blood and slidably mounted in the container, said piston having means on an outer surface in sealing engagement with an inner surface of the container, said sealing means being constructed and arranged to maintain said piston at a first position adjacent the second of said closures when subjected to a first centrifugal force and to disengage when subjected to a second greater centrifugal force so that when said container is subjected to said first centrifugal force the blood separates into its light phase and heavy phase but the piston stays in said first position and subsequently when said second greater centrifugal force is used the sealing means automatically disengages, the light phase thereby passing around the sealing means enabling the piston to move down through the light phase; and d. stop means comprising a cord of a predetermined length extending from said second closure to the piston whereby the piston when moving through the light phase will stop a predetermined distance from said first end of the container.
Claim 3
Dependent Claim
76 words
The separator of claim 1 wherein the sealing means associated with the said piston comprises flexible sealing fins on the outer surface of the piston in sealing engagement with an inner surface of the container which fins are slanted in an upward direction and are adapted when centrifugal force is applied to the assembly to permit the light phase to pass around the periphery of the piston when the piston moves down through the light phase.
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) | 1978-06-16 | 1978-12-16 | 1979-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-16 | 1982-12-16 | 1983-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-16 | 1986-12-16 | 1987-06-17 | $7700.00 | Window Closed / Lapsed |