Liquid purification or separation – Gravitational separator – Portable invertible – e.g. – milk and cream separator
Patent
1990-04-23
1991-08-06
Jones, W. Gary
Liquid purification or separation
Gravitational separator
Portable invertible, e.g., milk and cream separator
210514, 210518, 422101, 422102, 494 16, B01D 2126
Patent
active
050375490
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
This invention relates to blood separation devices. More particularly, the invention concerns a device for the removal of the serum which is separated from the blood cake through centrifugation of a test tube, closed at least on one side by a plug, the device comprising a top which is essentially rotationally symmetrical and which is furnished with a first collar encircling the plug and a cannula which penetrates the plug, and comprising a serum container for receiving the part of the serum which settles during centrifugation in the test tube.
A test tube for receiving a blood sample which is to be separated through centrifugation is known from DE-OS 27 11 336. This test tube receives a separating body, the specific gravity of which is between those of the two components of the blood to be separated. The separating body moves during centrifugation between the two components and separates the components after completion of the centrifugation by blocking the diameter of the separation tube. This test-tube construction is easy to handle. It may be felt to be a disadvantage that the sample container in this system is not closed.
In addition, a device is known which removes the serum of a blood sample to be separated through centrifugation into blood cake and serum with the prior art features of claim 1. For transferring the serum into a special serum container the rubber plug is penetrated by a cannula which is set on a top which is to be pushed onto the rubber plug. A sucking tube which is attached to a serum container is introduced into the cannula which penetrates the rubber plug. Serum is now pumped by means of a special vacuum pump from the test tube into the serum container.
This system has the disadvantage that the serum has to be pumped by a special pump from the test tube into the serum container after centrifugation.
SUMMARY OF THE INVENTION
It is the object of the invention to provide a device described above in which the serum is transferred automatically into the separated serum container after centrifugation.
In accordance with the invention this object is solved in that the top is provided with a second collar which extends away from the plug. This collar receives the serum container in a piston-like gliding motion. The cannula extends down into the serum and the second collar or the serum container is provided with a passage which runs from the cannula to the serum container. The passage is opened only when the serum container is lowered to the plug.
A preferred embodiment is characterized in that the passage is formed as a groove extending along the inner wall of the second collar above the upper edge of the serum container when the serum container is lowered to the plug.
Furthermore, it is suggested that the passage is so formed that it holds back fibers.
Furthermore, a cap closing the serum container may be provided.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention is now explained by means of a drawing, in which:
FIG. 1 shows a section-view through a test tube of the invention after attaching the top, but before centrifugation, and
FIG. 2 shows a view in accordance with FIG. 1, but after centrifugation.
DETAILED DESCRIPTION OF THE INVENTION
The test tube 10, is closed by a plug 12. Attached to the plug 12 is a top 14 which comprises a first collar 16 encircling the plug 12, a cannula 18 penetrating the plug 12 and a second collar 22 extending away from the plug 12. The second collar 22 receives a serum container 20 in a piston-like gliding motion. Before centrifugation the serum container 20 is placed at such a distance from the rubber plug 12 that space 24 is formed between the serum container 20 and the rubber plug 12 (FIG. 1). During centrifugation the serum container 20 is lowered because of the centrifugal force in the direction of the rubber plug 12. Due to the fact that the serum container 20 acts as a seal at the inner wall of the second collar 22 the air in the space 24 is displaced by the serum container 20. The air in the space 24 is pressed t
REFERENCES:
patent: 3850174 (1974-11-01), Ayres
patent: 3865731 (1975-02-01), Seitz
patent: 4046699 (1977-09-01), Zine, Jr.
patent: 4052320 (1977-10-01), Jakubowicz
patent: 4154690 (1979-05-01), Ballies
patent: 4472180 (1984-09-01), Montefiori
patent: 4602995 (1986-07-01), Cassaday et al.
patent: 4891134 (1990-01-01), Vcelka
patent: 4957637 (1990-09-01), Cornell
Jones W. Gary
Larson Herbert W.
LandOfFree
Device for the removal of serum separated from blood does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Device for the removal of serum separated from blood, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Device for the removal of serum separated from blood will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1985072