US4364832A
Expired / Lapsed
US
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Separating member in a separating tube for centrifugal separation
Assignee: BPS SEPARETTE AG
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Filing: 1982-01-18
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Granted: 1982-12-21
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Expires: 2002-01-18
Abstract
Abstract A separating tube (2) preferably made from a plastics material for centrifugal separation of a liquid containing at least two components and preferably blood is provided, in which an asymmetrically shaped separating member (6) serves to separate the two components. The separating member (6) has a specific gravity between that of the two components to be separated. As a result of the asymmetrical shape, the center of gravity (S) of separating member (6) is eccentrically positioned with respect to axis (M) of separating tube (2), so that the separating member (6) is rotated or tilted during centrifuging. At least one gap (f) is formed through which one of the two components reaches the top of separating member (6). At the end of the centrifuging process, the bouyancy of the heavier component rotates separating member (6) back into its original position in which it seals off separating tube (2). FIG. 4 is intended for publication with the summary.
Inventors
- 👤 Uwe W. Ballies
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:51
CPC Classifications
B; B01; B01L; B01L3/00; B01L3/50; B01L3/502; B01L3/5021; B01L3/50215
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
137 words
Separating member in a separating tube for the centrifugal separation of a liquid containing at least two components, which has a top surface and a bottom surface and is made from inelastic material, particularly inelastic plastic material, whose specific gravity is between that of the components to be separated and which in the rest state seals the cross-section of the separating tube, characterized in that the centre of gravity (S) of the separating member (6-6'") is arranged eccentrically with respect to its central axis (M) and that due to its shape, during centrifuging, the separating member (6-6'") can only be tilted in the separating tube (2) in such a way that a gap (f) is formed between the largest circumference (D 1 ) of the separating member (6-6'") and the inner wall of the separating tube (2).
Claim 2
Dependent Claim
137 words
Separating member in a separating tube for the centrifugal separation of a liquid containing at least two components, which has a top surface and a bottom surface and is made from inelastic material, particularly inelastic plastic material, whose specific gravity is between that of the components to be separated and which in the rest state seals the cross-section of the separating tube, characterized in that the centre of gravity (S) of the separating member (6-6'") is arranged eccentrically with respect to its central axis (M) and that due to its shape, during centrifuging, the separating member (6-6'") can only be tilted in the separating tube (2) in such a way that a gap (f) is formed between the largest circumference (D 1 ) of the separating member (6-6'") and the inner wall of the separating tube (2).
Claim 3
Dependent Claim
69 words
Separating tube according to claim 1, characterized in that the separating member (6) is shaped like an asymmetrical frustum, whose largest diameter D 1 is twice as large as its smallest diameter (D 2 ), the two diameters D 1 and D 2 being connected by a generatrix of the separating member (6) positioned vertically on both the largest diameter D 1 and the smallest diameter D 2 .
Claim 4
Dependent Claim
44 words
Separating tube according to claim 1, characterized in that the separating member (6") is in the shape of a cylindrical portion with a circular top surface (7) under whose free end is provided a separating wall (12) preventing an overturning of separating member (6").
Claim 5
Dependent Claim
32 words
Separating tube according to claim 3, characterized in that the underside (9) of the top surface (11) is inclined from its free end to the bottom surface (5") of separating member (6").
Claim 6
Dependent Claim
24 words
Separating tube according to claim 1, characterized in that the separating member (6'") is shaped like a cone with a rounded bottom surface (5'").
Claim 7
Dependent Claim
22 words
Separating tube according to claim 5, characterized in that the predetermined breaking point (16) is shaped into the rounded bottom surface (5'").
Claim 8
Dependent Claim
20 words
Separating tube according to claim 1, characterized in that the separating member (6, 6") has a conical top surface (7').
Claim 9
Dependent Claim
34 words
Separating tube according to any one of the claims 1 to 5 and 7, characterized in that the separating member (6-6'") is shaped onto a piston rod (15) by a predetermined breaking point (16).
Claim 10
Dependent Claim
33 words
Separating member according to claim 8, characterized in that the predetermined breaking point (16) is located on the planar top surface (7) of separating member (6) containing the largest diameter D 1 .
Claim 11
Dependent Claim
26 words
Separating tube according to claim 8, characterized in that the predetermined breaking point (16) is located at the tip of the conical top surface (7', 7").
Claim 12
Dependent Claim
29 words
Separating tube according to one of the claims 1 to 5 and 7, characterized in that the separating member (6-6'") has at least one eccentrically arranged bouyancy chamber (10).
Claim 13
Dependent Claim
17 words
Separating tube according to claim 1, characterized in that the separating member (6-6'") is made from polystyrene.
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) | 1985-12-20 | 1986-06-21 | 1986-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-12-20 | 1990-06-21 | 1990-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-12-20 | 1994-06-21 | 1994-12-21 | $7700.00 | Window Closed / Lapsed |