WO1993018858A1 - Laborröhrchen für die dosierung von flüssigkeiten - Google Patents
Laborröhrchen für die dosierung von flüssigkeiten Download PDFInfo
- Publication number
- WO1993018858A1 WO1993018858A1 PCT/EP1993/000615 EP9300615W WO9318858A1 WO 1993018858 A1 WO1993018858 A1 WO 1993018858A1 EP 9300615 W EP9300615 W EP 9300615W WO 9318858 A1 WO9318858 A1 WO 9318858A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- tube
- laboratory
- liquid
- inner tube
- tubes
- Prior art date
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
- B01L3/00—Containers or dishes for laboratory use, e.g. laboratory glassware; Droppers
- B01L3/50—Containers for the purpose of retaining a material to be analysed, e.g. test tubes
- B01L3/508—Containers for the purpose of retaining a material to be analysed, e.g. test tubes rigid containers not provided for above
- B01L3/5082—Test tubes per se
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
- B01L3/00—Containers or dishes for laboratory use, e.g. laboratory glassware; Droppers
- B01L3/50—Containers for the purpose of retaining a material to be analysed, e.g. test tubes
- B01L3/502—Containers for the purpose of retaining a material to be analysed, e.g. test tubes with fluid transport, e.g. in multi-compartment structures
- B01L3/5021—Test tubes specially adapted for centrifugation purposes
Definitions
- the present invention relates to a laboratory tube for the dosing of liquids with which it is possible, simple, user-friendly and contamination-proof, to retain part of a liquid in a predetermined amount in the laboratory tube and to remove the rest. With this device it is possible on the one hand to concentrate sediable solids and on the other hand to dilute dissolved substances.
- an inner tube is inserted into the laboratory tube, which has a cylindrical opening, the outer diameter of which is 0.5-2 mm smaller than the inner diameter of the cylindrical opening, so that a defined space is formed which, depending on the length of the inserted inner tube, defines a retention space .
- This retention space fills with the outflowing liquid when the contents of the laboratory tube are slowly poured out, so that only the excess runs off and flows completely out of this space when the tube is returned to the vertical.
- the space In order to allow a complete reflux, the space must not be so narrow that capillary forces hold part of the liquid when it is reset, which results in the lower limit of about 0.5-1 mm.
- the gap should not become too wide either, since otherwise the length of the inner tube becomes correspondingly smaller for a certain retention volume and additional errors can occur when emptying.
- the inner opening of the inserted inner tube used for filling and emptying becomes correspondingly small, which in turn can lead to handling disadvantages. It is therefore advantageous to expand this opening in a funnel shape or, if desired, also to provide it with a pouring cable.
- the firm connection between the laboratory tube and the inner tube is preferably brought about in that the inner tube has a corresponding thickening in its upper part, which can be inserted into the opening of the laboratory tube with a certain pressure.
- a molded collar can be provided to prevent the tube from being pressed too deeply.
- the thickening inside can then be dispensed with.
- laboratory tubes are made almost entirely of glass or plastic and can be manufactured with very small tolerances.
- the inner tubes used according to the invention are preferably also made of plastic, which on the one hand has sufficient elasticity to form a tight connection with the laboratory tube and on the other hand is so inexpensive that the entire device is manufactured as a disposable article and can therefore be thrown away after use. If the laboratory tube and inner tube are made of the same plastic, there is also the advantageous possibility of recycling the plastic without having to separate the two parts again.
- the present invention is particularly intended for the commercially available centrifuge tubes, which have a content of about 15 ml and e.g. with markings for 3, 5 and 10 ml. With a length of about 10 cm, such tubes have an inner diameter of 14 mm. An inserted inner tube with 12 mm
- the device itself has been developed for the concentration of sediments in centrifuge tubes, the same device can of course also be used for differently shaped vessels as long as they have an opening which fits exactly with the device.
- the usual 10 ml syringe made of plastic that can be shortened for centrifugation Piston shaft has, after centrifugation, also be provided with such an inner tube and in this way not only a defined amount of serum but also a defined amount of the sediment resuspended in the serum is obtained, which is available for further investigation.
- Other laboratory vessels such as Erlenmeyer flasks and round-bottom flasks etc., which have a cylindrical opening with a suitable inner diameter, can also be converted into a measuring vessel by attaching a corresponding retention device.
- Other forms of application are conceivable without being listed in detail here.
- Figure 1 shows a centrifuge glass with a retention system inserted
- Figure la is a section through the system
- Figure lb shows the filled tube
- Figure lc shows the inclined tube with the escaping liquid
- Figure ld shows the empty tube with the remaining volume in the Retaining device
- figure le shows the turned back tube with the remaining volume on the sediment.
- Figure 2 is an enlarged representation of the figure le with the laboratory tube 1, the inserted inner tube 2 which has a thickening 3 which fits into the inner diameter of the laboratory tube 1 and a collar 4 which encloses the laboratory tube 1 on the outside.
- a funnel-shaped extension 5 is incorporated in the thickening 3 and the collar 4, a funnel-shaped extension 5 is incorporated.
- the space between the inner tube 2 and the laboratory tube 1 defines the retention volume 7, which corresponds to the volume 7a in the reset state.
- a sediment 8 is indicated at the bottom of the tube 2.
- Figure 3 shows a simplified embodiment of the inner tube, which consists only of the inner tube 2 and the molded thickening 3.
- FIG. 4 shows a device which, in addition to the inner tube 2, the thickening 3 and the collar 4, also has a molded spout 9.
- FIG. 5 shows a commercially available syringe with the outer tube 10, the piston 11, the handle 13 provided with several notches 12 and a screw-on closure cap 14 to which the cannula hub 15 is molded.
- FIG. 5a shows the same syringe with the attachment according to the invention, which is screwed onto the syringe via a screw connection 16.
- the handle 13 has broken off at the first notch 12.
Landscapes
- Health & Medical Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- General Health & Medical Sciences (AREA)
- Hematology (AREA)
- Clinical Laboratory Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Sampling And Sample Adjustment (AREA)
- Devices For Use In Laboratory Experiments (AREA)
- Investigating Or Analysing Biological Materials (AREA)
- Infusion, Injection, And Reservoir Apparatuses (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE59300720T DE59300720D1 (de) | 1992-03-25 | 1993-03-16 | Laborröhrchen für die dosierung von flüssigkeiten. |
EP93920526A EP0632749B1 (de) | 1992-03-25 | 1993-03-16 | Laborröhrchen für die dosierung von flüssigkeiten |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEG9203973.1U | 1992-03-25 | ||
DE9203973U DE9203973U1 (de) | 1992-03-25 | 1992-03-25 | |
DEP4243478.5 | 1992-12-22 | ||
DE4243478A DE4243478A1 (de) | 1992-03-25 | 1992-12-22 | Laborröhrchen für die Dosierung von Flüssigkeiten |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1993018858A1 true WO1993018858A1 (de) | 1993-09-30 |
Family
ID=25921616
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP1993/000615 WO1993018858A1 (de) | 1992-03-25 | 1993-03-16 | Laborröhrchen für die dosierung von flüssigkeiten |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP0632749B1 (de) |
AT (1) | ATE128645T1 (de) |
AU (1) | AU3749093A (de) |
CA (1) | CA2117696A1 (de) |
DE (2) | DE4243478A1 (de) |
WO (1) | WO1993018858A1 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL2014739A (en) * | 2015-04-30 | 2016-11-07 | Labonovum B V | Fluid collection device. |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103055988A (zh) * | 2012-08-27 | 2013-04-24 | 浙江硕华医用塑料有限公司 | 离心管 |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3481712A (en) * | 1959-11-20 | 1969-12-02 | Clay Adams Inc | Sediment container and cap and analysis technique |
FR2122187A5 (de) * | 1971-01-12 | 1972-08-25 | Damon Corp | |
US3748099A (en) * | 1971-09-07 | 1973-07-24 | Toluca Ind Corp | Liquid handling device |
GB2082091A (en) * | 1980-08-21 | 1982-03-03 | Squibb & Sons Inc | Container for centrifuging blood |
-
1992
- 1992-12-22 DE DE4243478A patent/DE4243478A1/de not_active Withdrawn
-
1993
- 1993-03-16 WO PCT/EP1993/000615 patent/WO1993018858A1/de active IP Right Grant
- 1993-03-16 EP EP93920526A patent/EP0632749B1/de not_active Expired - Lifetime
- 1993-03-16 AT AT93920526T patent/ATE128645T1/de not_active IP Right Cessation
- 1993-03-16 CA CA002117696A patent/CA2117696A1/en not_active Abandoned
- 1993-03-16 DE DE59300720T patent/DE59300720D1/de not_active Expired - Lifetime
- 1993-03-16 AU AU37490/93A patent/AU3749093A/en not_active Abandoned
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3481712A (en) * | 1959-11-20 | 1969-12-02 | Clay Adams Inc | Sediment container and cap and analysis technique |
FR2122187A5 (de) * | 1971-01-12 | 1972-08-25 | Damon Corp | |
US3748099A (en) * | 1971-09-07 | 1973-07-24 | Toluca Ind Corp | Liquid handling device |
GB2082091A (en) * | 1980-08-21 | 1982-03-03 | Squibb & Sons Inc | Container for centrifuging blood |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL2014739A (en) * | 2015-04-30 | 2016-11-07 | Labonovum B V | Fluid collection device. |
Also Published As
Publication number | Publication date |
---|---|
DE59300720D1 (de) | 1995-11-09 |
ATE128645T1 (de) | 1995-10-15 |
EP0632749B1 (de) | 1995-10-04 |
AU3749093A (en) | 1993-10-21 |
EP0632749A1 (de) | 1995-01-11 |
CA2117696A1 (en) | 1993-09-26 |
DE4243478A1 (de) | 1993-09-30 |
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