US3815790A - Precision liquid pipetting devices - Google Patents

Precision liquid pipetting devices Download PDF

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Publication number
US3815790A
US3815790A US00289996A US28999672A US3815790A US 3815790 A US3815790 A US 3815790A US 00289996 A US00289996 A US 00289996A US 28999672 A US28999672 A US 28999672A US 3815790 A US3815790 A US 3815790A
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Prior art keywords
pipette
barrel
plunger
stop
pipetting device
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US00289996A
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D Allen
T Lee
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KENSINGTON SCIENT CORP
KENSINGTON SCIENTIFIC CORP US
Baxter International Inc
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KENSINGTON SCIENT CORP
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Priority to DE2456049A priority patent/DE2456049C3/en
Assigned to SMI ACQUISITION CORPORATION, A DE CORP. reassignment SMI ACQUISITION CORPORATION, A DE CORP. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: SCIENTIFIC MANUFACTURING INDUSTRIES,
Assigned to AMERICAN HOSPITAL SUPPLY CORPORATION, reassignment AMERICAN HOSPITAL SUPPLY CORPORATION, ASSIGNMENT OF ASSIGNORS INTEREST. EFFECTIVE DATE JULY 3,1983 Assignors: SMI ACQISITION CORPORATION
Assigned to BAXTER TRAVENOL LABORATORIES, INC. A CORP. OF DE reassignment BAXTER TRAVENOL LABORATORIES, INC. A CORP. OF DE MERGER (SEE DOCUMENT FOR DETAILS). EFFECTIVE ON 11/25/1985 ILLINOIS Assignors: AMERICAN HOSPITAL SUPPLY CORPORATION INTO
Assigned to BAXTER INTERNATIONAL INC. reassignment BAXTER INTERNATIONAL INC. CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). EFFECTIVE ON 10/17/1988 Assignors: BAXTER TRAVENOL LABORATORIES, INC., A CORP. OF DE
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    • 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
    • B01L3/0217—Pipettes, i.e. with only one conduit for withdrawing and redistributing liquids of the plunger pump type
    • B01L3/0224—Pipettes, i.e. with only one conduit for withdrawing and redistributing liquids of the plunger pump type having mechanical means to set stroke length, e.g. movable stops
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F11/00—Apparatus requiring external operation adapted at each repeated and identical operation to measure and separate a predetermined volume of fluid or fluent solid material from a supply or container, without regard to weight, and to deliver it
    • G01F11/02—Apparatus requiring external operation adapted at each repeated and identical operation to measure and separate a predetermined volume of fluid or fluent solid material from a supply or container, without regard to weight, and to deliver it with measuring chambers which expand or contract during measurement
    • G01F11/04—Apparatus requiring external operation adapted at each repeated and identical operation to measure and separate a predetermined volume of fluid or fluent solid material from a supply or container, without regard to weight, and to deliver it with measuring chambers which expand or contract during measurement of the free-piston type
    • G01F11/06—Apparatus requiring external operation adapted at each repeated and identical operation to measure and separate a predetermined volume of fluid or fluent solid material from a supply or container, without regard to weight, and to deliver it with measuring chambers which expand or contract during measurement of the free-piston type with provision for varying the stroke of the piston

Definitions

  • This invention relates generally to precision liquid pipetting devices and more particularly to improved means for adjusting the stroke of and calibrating the capacity of pipetting dispensers.
  • the principal object of this invention is to provide improved means for calibrating the volumetric capacity of a pipetting dispenser with a reproducible high degree of accuracy.
  • Another object of this invention is to provide simple means for selectively varying the volume of liquid dispensable from a micropipette of a particular size.
  • FIG. I is an overall view of one embodiment of precision pipetting device employing a disposable pipette of relatively large diameter
  • FIG. 2 illustrates another embodiment of precision pipetting device which employs a disposable micropipette of much smaller diameter
  • FIG. 3 is a cross-sectional view of the barrel and plunger assembly of the pipetting device of FIG. 1;
  • FIG. 4 is a cross-sectional view of the end of the barrel of the pipetting device of FIG. 3 with a different end cap in place;
  • FIG. is an end view of the cap ends of the pipetting devices of FIGS. 1 and 2;
  • FIG. 6 is a cross-sectional view of the calibration assembly of the pipetting device of FIG. 2;
  • FIG. 7 is a cross-sectional view of an alternate end construction for the pipetting device of FIG. 2;
  • FIG. 8 is a cross-sectional view of the calibration assembly of the pipetting device of FIG. 1.
  • This invention relates to improvements in precision pipetting devices of the type generally disclosed in M. E. Drummond, et al. US. Pat. No. 3,606,086 issued Sept. 20, 1971 for Microdispensing Device.
  • the devices include an elongated barrel 1 and a disposable pipette demountably mounted on the barrel, such as the extruded plastic pipette 2 of relatively large diameter illustrated in FIG. 1 or the smaller precision glass micropipette 2' illustrated in FIG. 2.
  • a reciprocable plunger 3 carried in part within the barrel 1 has one end within the pipette to draw liquid into and to dispense liquid from it.
  • Each of the described embodiments of barrel 1 has an interior bore into which the plunger 3 passes and is affixed to a plunger holder 4 at one end.
  • the coil spring means 5 within the bore of the barrel seats at one end against the barrel itself and at the other end against a seat 6 on the plunger holder, for example, to bias the plunger toward the withdrawn end of its stroke as is shown in FIGS. 3 and 4.
  • These threaded end caps 7, 7' have a generally circular head 8 substantially larger in diameter than the barrel 1 which is flattened as at face 9 shown in FIG. 5 to prevent roll of the pipetting device when it is resting upon a generally horizontal surface.
  • Each end cap 7, 7 also has a shoulder 10 spaced from its threads toward the coil spring means against which the plunger holder seat 6 abuts as the spring means biases the plunger toward the withdrawn end of its stroke.
  • a button head 11 threads into the remote end of the plunger holder 4 for manipulation of it. The thumb or forefinger of the user presses upon this button head and simultaneously pulls against the head 8 of end cap 7, 7'. etc. to extend the plunger 3.
  • the bias coil spring means 5 returns the plunger 3 to the withdrawn end of its stroke.
  • the embodiment of dispenser illustrated in FIG. 1 includes a plunger 3 which carries at its free end a semiresilient tip 15 which is substantially larger in diameter than the plunger and flexibly embraces the interior walls of the pipette 2 to force fluid from or draw fluid into the pipette.
  • a similar construction is shown in FIG. 6 in the tip 15' of the other embodiment of the invention.
  • the precision micropipette 2 can be formed with an internal diameter so precise that for small diameters the plunger 3 may be deployed within it without any tip 15' as is shown in FIG. 7.
  • the device of FIG. 1 has a pipette stop 20 mounted adjacent to the pipette-end of the barrel which is adjustably positionable along the axis of travel of the plunger.
  • the pipette stop 20 as shown in FIG. 8 comprises a hub 21 with an interior bore 22 which slides upon a cylindrical tip 23 of substantially the same diameter which protrudes from that end of the barrel 1 and sleeves over reciprocable plunger 3.
  • Set screw 24 in the hub 21 of the pipette stop 20 can be tightened against cylindrical tip 23 to position the stop 20 at any point along it.
  • a smaller diameter sleeve portion 25 of the stop 20 carries the flanged end of plastic pipette 2 press fit upon it with its flange 26 seated against hub 21.
  • the structure of the dispenser embodiment of FIG. 2 is similar in function.
  • the pipette stop 20 has a bore for the plunger 3 which is smaller than the diameter of the pipette 2' that mounts at the end of the barrel.
  • the stop 20' is adjustably positionable along the axis of travel of the plunger 3 by shifting its position within a cylindrical bore 28 in the end of barrel 1 and by holding it there with set screw 24'.
  • the pipette 2 seats against the pipette stop 20 and is held against it by a knurled collet 30 having female threads which thread upon a male threaded portion 31 of the barrel 1.
  • the precision pipetting dispensers of this invention provide the user with a means for precisely measuring and dispensing volumes in the order from I to I00 lambda or larger. They also provide a given dispenser with a variety of stroke lengths by an appropriate series of interchangeable end caps 7, 7', etc. Accuracy and reproducibility in the order of :1 percent is easily attained.
  • the dispenser is easily calibrated by placing in either of pipettes 2 or 2' a calibration tool which is nothing more than a wire or rod of predetermined length, loosening the set screws 24, 24 and in the embodiment of FIG. 2 loosening collet 30 also.
  • a plunger carried in part within the barrel and reciprocable with a predetermined stroke within the pipette to draw liquid into and to dispense liquid from the pipette
  • the improvement comprising a pipette calibration stop mounted adjacent said end of the barrel and being adjustably positionable along the axis of travel of the plunger, such that the pipette can be adjustably positioned with respect to the stroke of said plunger, and
  • a plunger carried in part within the barrel and reciprocable with a predetermined stroke within the pipette to draw liquid into and to dispense liquid from the pipette
  • a pipette calibration stop mounted adjacent said end of the barrel and being adjustably positionable along the axis of travel of the plunger such that the pipette can be adjustably positioned with respect to the stroke of said plunger;
  • each of the series having a shoulder spaced a different distance toward the spring means and by abuttment selectively limiting the travel of the plunger at the withdrawn end of its stroke.
  • end cap is generally circular with a diameter greater than the barrel and has a flattened face for preventing roll of the pipetting device when resting upon a generally horizontal surface.

Abstract

Precision liquid pipetting devices for use with disposable pipettes having improved means for adjusting the stroke of the plunger within the pipette and for precisely calibrating the volumetric capacity.

Description

United States Patent 1191 Allen et al. 1 June 11, 1974 [5 PREClSlON LIQUID PIPETTING DEVICES 3.343.539 9/1967 Moorehouse 222/309 x 3.3 6,286 l l968 Kl h 222 386 [75] Inventors: Allen Pmole? Thomas 3,4?7904 12/1968 222/386 Lafayette, both of Cahf- 3,606.086 9/1971 Drummond 222/309 x [73] Assignee: Kensington Scientific Corporation,
Emeryville, Calif. Primary Examiner-Robert B. Reeves [22] Flled: Sept 1972 Assistant ExaminerTh0mas E. Kocovsky [211 App]. N0.: 289,996
[52] US. Cl 222/309, 128/218, 222/386 511 1m. (:1. G01f 13/00 [57] ABSTRACT [58] Field of Search 222/308, 309, 386;
73/4254 P, 425,6; 128/218 P, 218 PA, 218 Precision liquid pipetting devices for use with dispos- C, 218 D, 218 F, 234 able pipettes having improved means for adjusting the stroke of the plunger within the pipette and for pre- [56] References Cited cisely calibrating the volumetric capacity.
UNITED STATES PATENTS 3.334,?88 8/1967 Hamilton 222/386 X 7 Claims, 8 Drawing Figures PRECISION LIQUID PIPETTING DEVICES This invention relates generally to precision liquid pipetting devices and more particularly to improved means for adjusting the stroke of and calibrating the capacity of pipetting dispensers.
The principal object of this invention is to provide improved means for calibrating the volumetric capacity of a pipetting dispenser with a reproducible high degree of accuracy.
Another object of this invention is to provide simple means for selectively varying the volume of liquid dispensable from a micropipette of a particular size.
Other objects and advantages of the invention will become apparent upon consideration of the following description and the accompanying drawings wherein FIG. I is an overall view of one embodiment of precision pipetting device employing a disposable pipette of relatively large diameter;
FIG. 2 illustrates another embodiment of precision pipetting device which employs a disposable micropipette of much smaller diameter;
FIG. 3 is a cross-sectional view of the barrel and plunger assembly of the pipetting device of FIG. 1;
FIG. 4 is a cross-sectional view of the end of the barrel of the pipetting device of FIG. 3 with a different end cap in place;
FIG. is an end view of the cap ends of the pipetting devices of FIGS. 1 and 2;
FIG. 6 is a cross-sectional view of the calibration assembly of the pipetting device of FIG. 2;
FIG. 7 is a cross-sectional view of an alternate end construction for the pipetting device of FIG. 2; and
FIG. 8 is a cross-sectional view of the calibration assembly of the pipetting device of FIG. 1.
This invention relates to improvements in precision pipetting devices of the type generally disclosed in M. E. Drummond, et al. US. Pat. No. 3,606,086 issued Sept. 20, 1971 for Microdispensing Device. The devices include an elongated barrel 1 and a disposable pipette demountably mounted on the barrel, such as the extruded plastic pipette 2 of relatively large diameter illustrated in FIG. 1 or the smaller precision glass micropipette 2' illustrated in FIG. 2. A reciprocable plunger 3 carried in part within the barrel 1 has one end within the pipette to draw liquid into and to dispense liquid from it.
Each of the described embodiments of barrel 1 has an interior bore into which the plunger 3 passes and is affixed to a plunger holder 4 at one end. The coil spring means 5 within the bore of the barrel seats at one end against the barrel itself and at the other end against a seat 6 on the plunger holder, for example, to bias the plunger toward the withdrawn end of its stroke as is shown in FIGS. 3 and 4.
A series of end caps 7, 7 or more, each thread into the open end of the barrel and each has a bore through which the plunger holder 4 slides. These threaded end caps 7, 7' have a generally circular head 8 substantially larger in diameter than the barrel 1 which is flattened as at face 9 shown in FIG. 5 to prevent roll of the pipetting device when it is resting upon a generally horizontal surface. Each end cap 7, 7 also has a shoulder 10 spaced from its threads toward the coil spring means against which the plunger holder seat 6 abuts as the spring means biases the plunger toward the withdrawn end of its stroke. As will be noted by a comparison of FIGS. 3 and 4 the shoulder 10 of each of the series of end caps 7, 7', etc. is spaced a different difference from its threads so that by interchanging end caps one can selectively adjust the length of the plunger stroke in predetermined increments. A button head 11 threads into the remote end of the plunger holder 4 for manipulation of it. The thumb or forefinger of the user presses upon this button head and simultaneously pulls against the head 8 of end cap 7, 7'. etc. to extend the plunger 3. The bias coil spring means 5 returns the plunger 3 to the withdrawn end of its stroke.
The embodiment of dispenser illustrated in FIG. 1 includes a plunger 3 which carries at its free end a semiresilient tip 15 which is substantially larger in diameter than the plunger and flexibly embraces the interior walls of the pipette 2 to force fluid from or draw fluid into the pipette. A similar construction is shown in FIG. 6 in the tip 15' of the other embodiment of the invention. The precision micropipette 2 can be formed with an internal diameter so precise that for small diameters the plunger 3 may be deployed within it without any tip 15' as is shown in FIG. 7.
The device of FIG. 1 has a pipette stop 20 mounted adjacent to the pipette-end of the barrel which is adjustably positionable along the axis of travel of the plunger. In that embodiment the pipette stop 20 as shown in FIG. 8 comprises a hub 21 with an interior bore 22 which slides upon a cylindrical tip 23 of substantially the same diameter which protrudes from that end of the barrel 1 and sleeves over reciprocable plunger 3. Set screw 24 in the hub 21 of the pipette stop 20 can be tightened against cylindrical tip 23 to position the stop 20 at any point along it. A smaller diameter sleeve portion 25 of the stop 20 carries the flanged end of plastic pipette 2 press fit upon it with its flange 26 seated against hub 21. By precisely positioning stop 20 on the protruding cylindrical tip 22 of the barrel, one can precisely calibrate the volume of the pipette into which liquid is drawn and from which it is dispensed for any particular plunger stroke.
The structure of the dispenser embodiment of FIG. 2 is similar in function. As is illustrated more particularly in FIG. 6 the pipette stop 20 has a bore for the plunger 3 which is smaller than the diameter of the pipette 2' that mounts at the end of the barrel. The stop 20', too, is adjustably positionable along the axis of travel of the plunger 3 by shifting its position within a cylindrical bore 28 in the end of barrel 1 and by holding it there with set screw 24'. The pipette 2 seats against the pipette stop 20 and is held against it by a knurled collet 30 having female threads which thread upon a male threaded portion 31 of the barrel 1. A conical seat 32 within the threaded portion 31 of the barrel and next to bore 28 diverges outwardly toward the collet. A semi-resilient truncated generally conical pipette retainer 33 encompasses the pipette and is forced against the conical seat 32 as the collet 30 threads upon the threaded portion 31 of the barrel.
The precision pipetting dispensers of this invention provide the user with a means for precisely measuring and dispensing volumes in the order from I to I00 lambda or larger. They also provide a given dispenser with a variety of stroke lengths by an appropriate series of interchangeable end caps 7, 7', etc. Accuracy and reproducibility in the order of :1 percent is easily attained. The dispenser is easily calibrated by placing in either of pipettes 2 or 2' a calibration tool which is nothing more than a wire or rod of predetermined length, loosening the set screws 24, 24 and in the embodiment of FIG. 2 loosening collet 30 also. With the calibration tool of known length slipped into the open end of the pipette, the pipette is placed vertically with that end against a flat horizontal surface so that the end of the tool aligns precisely with the end of the pipette. This automatically positions the loosened pipette stop for correct calibration for that particular calibration tool. The set screw 24, 24 is then tightened in this position and, in the embodiment of FIG. 2, the collet is tightened to hold the pipette against the stop The press fit of pipette 2 upon sleeve portion of the stop 20 in the embodiment of FIGJI holds that pipette in place against hub 21 of the stop The two embodiments of this invention have been described for illustrative purposes only. The invention is defined in the following claims.
We claim:
1. In a precision liquid pipetting device having an elongated barrel,
a pipette mounted upon one end of the barrel, and
a plunger carried in part within the barrel and reciprocable with a predetermined stroke within the pipette to draw liquid into and to dispense liquid from the pipette,
the improvement comprising a pipette calibration stop mounted adjacent said end of the barrel and being adjustably positionable along the axis of travel of the plunger, such that the pipette can be adjustably positioned with respect to the stroke of said plunger, and
means holding the pipette against the pipette stop.
2. The precision liquid pipetting device of claim 1 wherein the improvement further comprises a semiresilient tip on the end of the plunger flexibly embracing the interior walls of the pipette.
3. The precision liquid pipetting device of claim 1 wherein the means holding the pipette against the pipette stop is a cylindrical sleeve integral with the stop upon which the pipette press fits.
4. The precision liquid pipetting device of claim 1 wherein the means holding the pipette against the pipette stop is a collet threaded to said end of the barrel.
5. The precision liquid pipetting device of claim 4 wherein the improvement further comprises a semi-resilient truncated conical pipette retainer encompassing the pipette;
a male threaded portion on said end of the barrel and a conical seat within the threaded portion that diverges toward said end; and
corresponding female threads on the collet for forcing the retainer against the seat when threaded upon the male threads to retain the pipette against the pipette stop.
6. In a precision liquid pipetting device having an elongated barrel,
a pipette mounted upon one end of the barrel.
a plunger carried in part within the barrel and reciprocable with a predetermined stroke within the pipette to draw liquid into and to dispense liquid from the pipette, and
coil spring means within the barrel for normally biasing the plunger to a withdrawn end of its stroke, the improvement comprising a pipette calibration stop mounted adjacent said end of the barrel and being adjustably positionable along the axis of travel of the plunger such that the pipette can be adjustably positioned with respect to the stroke of said plunger;
means holding the pipette against the pipette stop;
and
one of a series of end caps threaded to the barrel at its other end, each of the series having a shoulder spaced a different distance toward the spring means and by abuttment selectively limiting the travel of the plunger at the withdrawn end of its stroke.
7. The precision liquid pipetting device of claim 6 wherein the end cap is generally circular with a diameter greater than the barrel and has a flattened face for preventing roll of the pipetting device when resting upon a generally horizontal surface.

Claims (7)

1. In a precision liquid pipetting device having an elongated barrel, a pipette mounted upon one end of the barrel, and a plunger carried in part within the barrel and reciprocable with a predetermined stroke within the pipette to draw liquid into and to dispense liquid from the pipette, the improvement comprising a pipette calibration stop mounted adjacent said end of the barrel and being adjustably positionable along the axis of travel of the plunger, such that the pipette can be adjustably positioned with respect to the stroke of said plunger, and means holding the pipette against the pipette stop.
2. The precision liquid pipetting device of claim 1 wherein the improvement further comprises a semi-resilient tip on the end of the plunger flexibly embracing the interior walls of the pipette.
3. The precision liquid pipetting device of claim 1 wherein the means holding the pipette against the pipette stop is a cylindrical sleeve integral with the stop upon which the pipette press fits.
4. The precision liquid pipetting device of claim 1 wherein the means holding the pipette against the pipette stop is a collet threaded to said end of the barrel.
5. The precision liquid pipetting device of claim 4 wherein the improvement further comprises a semi-resilient truncated conical pipette retainer encompassing the pipette; a male threaded portion on said end of the barrel and a conical seat within the threaded portion that diverges toward said end; and corresponding female threads on the collet for forcing the retainer against the seat when threaded upon the male threads to retain the pipette against the pipette stop.
6. In a precision liquid pipetting device having an elongated barrel, a pipette mounted upon one end of the barrel, a plunger carried in part within the barrel and reciprocable with a predetermined stroke within the pipette to draw liquid into and to dispense liquid from the pipette, and coil spring means within the barrel for normally biasing the plunger to a withdrawn end of its stroke, the improvement comprising a pipette calibration stop mounted adjacent said end of the barrel and being adjustably positionable along the axis of travel of the plunger such that the pipette can be adjustably positioned with respect to the stroke of said plunger; means holding the pipette against the pipette stop; and one of a series of end caps threaded to the barrel at its other end, each of the series having a shoulder spaced a different distance toward the spring means and by abuttment selectively limiting the travel of the plunger at the withdrawn end of its stroke.
7. The precision liquid pipetting device of claim 6 wherein the end cap is generally circular with a diameter greater than the barrel and has a flattened face for preventing roll of the pipetting device when resting upon a generally horizontal surface.
US00289996A 1972-09-18 1972-09-18 Precision liquid pipetting devices Expired - Lifetime US3815790A (en)

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Cited By (27)

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US3921864A (en) * 1972-09-22 1975-11-25 Dawes Ernest Frederick Syringes for making precision volume measurements
FR2305713A1 (en) * 1975-03-25 1976-10-22 Faure Jean Metering pipette with exchangeable ends - having piston which protrudes into pipette to reduce dead space
DE2633530A1 (en) * 1975-07-25 1977-02-03 Pasteur Institut DEVICE FOR ACCEPTING AND / OR DISPENSING SMALL DOSED QUANTITIES OF LIQUIDS
FR2324366A1 (en) * 1975-09-18 1977-04-15 Labora Mannheim Gmbh PERFECTED LABORATORY PIPETTE
US4020698A (en) * 1974-10-29 1977-05-03 Marteau D Autry Eric Pipette which may be calibrated
US4098125A (en) * 1977-03-30 1978-07-04 Lee Thomas E Adjustable volume pipetting device
FR2383704A1 (en) * 1977-03-15 1978-10-13 Labora Mannheim Gmbh HAND PIPETTE
US4140488A (en) * 1977-09-06 1979-02-20 Hycel, Inc. Sample liquid transfer means in an automatic chemical testing apparatus
US4141469A (en) * 1977-05-02 1979-02-27 Lee Thomas E Microdispensing dilution system
US4165646A (en) * 1978-07-26 1979-08-28 Shapiro Justin J Adjustable micro-dispensing liquid pipet
US4178803A (en) * 1976-03-01 1979-12-18 Lee Thomas E Pipetting devices
US4249419A (en) * 1979-01-05 1981-02-10 Thomas Bradley S Micropipette system
DE2705933C3 (en) 1976-03-01 1981-02-12 Thomas E. Lafayette Calif. Lee (V.St.A.) Pipetting device
FR2489507A1 (en) * 1980-08-27 1982-03-05 Hettich Andreas Doser pipette for liquids - using push-button to actuate piston which forces specific vol. of liq. out of pipette tip (SE 8.3.82)
EP0076406A2 (en) * 1981-09-28 1983-04-13 Miles Laboratories, Inc. Analytical device and method
US4442722A (en) * 1982-02-23 1984-04-17 Beckman Instruments Inc. Plunger operated pipet
US4679446A (en) * 1985-09-09 1987-07-14 Baxter Travenol Laboratories, Inc. Multi-volume displacement pipette
WO1993011870A1 (en) * 1991-12-13 1993-06-24 John Poulten Limited Pipetter
US5725831A (en) * 1994-03-14 1998-03-10 Becton Dickinson And Company Nucleic acid amplification apparatus
US20030012079A1 (en) * 2001-07-16 2003-01-16 Stryker Instruments Bone cement mixing and delivery device for injection and method thereof
US6702990B1 (en) * 2002-02-05 2004-03-09 The Gel Company Spot picker
US20040267272A1 (en) * 2003-05-12 2004-12-30 Henniges Bruce D Bone cement mixing and delivery system
US20050128867A1 (en) * 2003-05-12 2005-06-16 Henniges Bruce D. Bone cement mixing and delivery system
US20120255378A1 (en) * 2011-04-07 2012-10-11 Medicatec Kabushiki-Kaisha Dispenser
US20130098864A1 (en) * 2010-07-26 2013-04-25 Lameplast S.P.A. Re-closable container for fluid products, particularly for medical, pharmaceutical and cosmetic products
USD731075S1 (en) * 2013-03-15 2015-06-02 Nalge Nunc International Corporation Pipette
US10343156B2 (en) 2013-03-15 2019-07-09 Nalge Nunc International Corporation Tapered pipette

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Cited By (43)

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US3921864A (en) * 1972-09-22 1975-11-25 Dawes Ernest Frederick Syringes for making precision volume measurements
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DE2456049A1 (en) 1976-07-15
DE2456049B2 (en) 1979-05-03

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