EP0212964A2 - Ventilkörper einer Probenröhre - Google Patents

Ventilkörper einer Probenröhre Download PDF

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Publication number
EP0212964A2
EP0212964A2 EP86306365A EP86306365A EP0212964A2 EP 0212964 A2 EP0212964 A2 EP 0212964A2 EP 86306365 A EP86306365 A EP 86306365A EP 86306365 A EP86306365 A EP 86306365A EP 0212964 A2 EP0212964 A2 EP 0212964A2
Authority
EP
European Patent Office
Prior art keywords
valve body
restriction
sample tube
tube
tubular body
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP86306365A
Other languages
English (en)
French (fr)
Other versions
EP0212964A3 (de
Inventor
William Thomas Dennis Bates
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bilbate Ltd
Original Assignee
Bilbate Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Bilbate Ltd filed Critical Bilbate Ltd
Publication of EP0212964A2 publication Critical patent/EP0212964A2/de
Publication of EP0212964A3 publication Critical patent/EP0212964A3/de
Withdrawn legal-status Critical Current

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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
    • B01L3/02—Burettes; Pipettes
    • B01L3/021—Pipettes, i.e. with only one conduit for withdrawing and redistributing liquids
    • B01L3/0213—Accessories for glass pipettes; Gun-type pipettes, e.g. safety devices, pumps
    • 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
    • B01L3/02—Burettes; Pipettes
    • B01L3/021—Pipettes, i.e. with only one conduit for withdrawing and redistributing liquids

Definitions

  • This invention relates to a valve body for a sample tube and to a sample tube which includes such a valve body.
  • My U.K. patent apecification No. 2 040 183 describes a sample tube for obtaining a column of liquid (principally blood) of predetermined height in the laboratory. A part ticular test is then to allow sediments in the liquid to settle over a period of time and this test is applicable to blood analysis.
  • the sample tube described in my U.K. patent specification No. 2 040 183 comprises a length of glass tube having a local restriction in internal diameter at a predetermined distance from one end and a valve member, conveniently a lead shot, disposed in the tube between the restriction and the other end of the tube: a further local restriction is formed in the tube either at that other end or between that other end and the first restriction and the lead shot is free to displace along the tube between the two restrictions.
  • the one end of the tube is dipped into the sample liquid to be tested and suction is applied to the other,upper end to draw the liquid into the tube.
  • the lead shot unseats readily from the first, lower restriction to enable the liquid to be drawn in freely and the suction is removed when the liquid is above this restriction: the lead shot then seats down onto this restriction under its own weight and the liquid is allowed to drain, passing the lead shot because this forms an imperfect seal with the restriction.
  • the liquid When the liquid has drained to the level of the lead shot and the restriction on which it is seated, the liquid is retained by surface tension effects, interacting with the lead shot and lower restriction. The column of liquid thus obtained is held indefinitely by these surface tension effects.
  • a sample tube valve body which comprises a tubular body of plastics material formed at one end for attachment to an end of a glass tube and formed with a restriction in internal diameter at a predetermined distance from its said one end, a valve member (e.g. a lead shot) being disposed within the tubular body between the restriction and the opposite end of the tubular body, the valve member being free for movement along the tubular body.
  • a valve member e.g. a lead shot
  • the lead shot or other valve member does not need to form a perfect seal with the restriction within the plastics tubular body, as the blood or other liquid will be held to that level by surface tension effects in the same manner as described above.
  • a sample tube comprising a glass tube having attached to one of its ends a sample tube valve body as defined above. This sample tube is then used in exactly the same manner as the sample tube of my U.K. patent specification No. 2 040 183.
  • the sample tube in accordance with this present invention is simpler to manufacture.
  • the plastics valve body admits to manufacture by injection moulding and the lead shot or other valve member may be inserted automatically.
  • the glass tube is a plain piece cut to predetermined length and simply burred over at its ends to remove sharp edges.
  • the valve body is then simply fitted to the glass tube,conveniently by pushing the end of the glass tube into an annular socket formed in the end of the plastics tubular body.
  • the entire sample tube need not be disposed of after use: the valve body may be removed from glass tube and disposed of, but the glass tube may be retained, washed and have a fresh valve body fitted to it for re-use.
  • the sample tube comprises a plain glass tube 1 of predetermined length and with its opposite ends burred over (by the application of a flame locally) to remove sharp edges.
  • the sample tube further comprises a tubular plastics valve body 10 which is formed with an annular socket 12 at one end, so that an end of the glass tube can be push-fitted into this to assemble the sample tube: the glass tube is a tight fit into the socket 12 so as to form a seal.
  • the longitudinal through-bore 14 of the tubular body is reduced in diameter over a length 14a at its socket end, so providing a restriction 16 at the transition in diameters,a predetermined distance from thesocket end of the body.
  • a further local restriction in the diameter of the bore 14 is formed at 18 between the transition or restriction 16 and the other end of the valve body: a lead shot is disposed in the through-bore 14 between the two restrictions 16,18 and this lead shot 20 forms an imperfect seal when seated on 16. But in use of the sample tube, with the valve body fitted to the end of the glass tube, the function is the same as that of the sample tube described in my U.K. patent specification No. 2 040 183 and the blood or other liquid is retained at the level of the lead shot 20 and its seat 16 by surface tension effects once the liquid has drained down to that level.
  • the valve body is manufactured by injection moulding and the lead shot is inserted automatically, being pushed in from the top end of the tubular body and past the restriction 18, which thereafter prevents the lead shot from escaping.
  • valve body and the glass tube 10 are straightforward to manufacture and fit together, whilst as explained above the valve body is for disposal after use but the glass tube may be washed and fitted with a fresh valve body for re-use.

Landscapes

  • Health & Medical Sciences (AREA)
  • Clinical Laboratory Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Investigating Or Analysing Biological Materials (AREA)
EP86306365A 1985-08-20 1986-08-18 Ventilkörper einer Probenröhre Withdrawn EP0212964A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB08520784A GB2179447A (en) 1985-08-20 1985-08-20 Sample tube valve body
GB8520784 1985-08-20

Publications (2)

Publication Number Publication Date
EP0212964A2 true EP0212964A2 (de) 1987-03-04
EP0212964A3 EP0212964A3 (de) 1987-05-13

Family

ID=10584015

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86306365A Withdrawn EP0212964A3 (de) 1985-08-20 1986-08-18 Ventilkörper einer Probenröhre

Country Status (4)

Country Link
EP (1) EP0212964A3 (de)
AU (1) AU6118186A (de)
GB (1) GB2179447A (de)
ZA (1) ZA866038B (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0317815A3 (de) * 1987-11-26 1990-05-30 FINBIOMEDICA S.r.l. Vorrichtung zur Ausführung von Mehrfachversuchen der Rotzellen-Sedimentierungsgeschwindigkeit in menschlichem oder tierichem Blut oder anderen Flüssigkeiten
US9956555B2 (en) 2012-11-30 2018-05-01 Rarecyte, Inc. Apparatus, system, and method for collecting a target material
JPWO2018061072A1 (ja) * 2016-09-27 2019-07-04 株式会社エー・アンド・デイ ピペットチップ装着用アダプタ

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7534397B2 (en) 2006-12-08 2009-05-19 Nicolae Dumitrescu Sample preparation device

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1093653A (fr) * 1953-11-13 1955-05-09 Pipette de sécurité pour laboratoire
US2930238A (en) * 1958-04-28 1960-03-29 Smith Kline French Lab Pipette
DK108688C (da) * 1966-07-11 1968-01-29 Niels Bay-Schmith Sugeapparat til opsugning af væskeformige substanser fra en legemshulhed.
GB1493879A (en) * 1976-03-03 1977-11-30 Poulten Ltd J Valve for controlling fluid flow
GB2040183B (en) * 1979-01-09 1982-05-26 Bates W T D Sample tube
DE3421955C2 (de) * 1984-06-13 1986-10-09 Walter Sarstedt Kunststoff-Spritzgußwerk, 5223 Nümbrecht Blutsenkungsvorrichtung

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0317815A3 (de) * 1987-11-26 1990-05-30 FINBIOMEDICA S.r.l. Vorrichtung zur Ausführung von Mehrfachversuchen der Rotzellen-Sedimentierungsgeschwindigkeit in menschlichem oder tierichem Blut oder anderen Flüssigkeiten
US9956555B2 (en) 2012-11-30 2018-05-01 Rarecyte, Inc. Apparatus, system, and method for collecting a target material
JPWO2018061072A1 (ja) * 2016-09-27 2019-07-04 株式会社エー・アンド・デイ ピペットチップ装着用アダプタ

Also Published As

Publication number Publication date
GB8520784D0 (en) 1985-09-25
EP0212964A3 (de) 1987-05-13
AU6118186A (en) 1987-02-26
ZA866038B (en) 1987-03-25
GB2179447A (en) 1987-03-04
GB2179447B (de) 1989-10-25

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Inventor name: BATES, WILLIAM THOMAS DENNIS