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Method-and-apparatus-for-forming-micropipette-of-controlled-configuration-by-selecting-the-pattern-of-heat-application

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Method and apparatus for forming micropipette of controlled configuration by selecting the pattern of heat application

Details

Inventors: Flaming, Dale G.;
Assignee:
Primary Examiner: Kellogg; Arthur
Assistant Examiner:
Attorney, Agent or Firm: Stidham; Melvin R.

A micropipette puller of this invention includes a pair of gripping jaws that pull a length of glass tubing in opposite directions. The source of heat is a laser and a beam is directed into a zoom lens, or a selected one of a series of lenses, so that a beam of selected length and configuration is refracted against the glass tubing between the gripping jaws.

DETAILED DESCRIPTION What is claimed as invention is: 1.
A micropipette puller comprising: a pair of gripping members for gripping a length of glass tubing at spaced points along the length thereof; means for applying pulling forces to separate said gripping means; a laser device for directing a laser beam; and a lens system capable of transmitting therefrom a beam of selected size and configuration, said lens being disposed to refract said laser beam against a predetermined length of said tubing between said spaced points.
2.
The micropopette puller defined by claim 1 wherein: said lens system is of the zoom type.
3.
The method of pulling micropipettes comprising the steps of: providing means for gripping a length of glass tubing at spaced points along the length thereof and applying forces to pull said gripping means apart; providing a laser device for directing a laser beam; providing an assembly of a plurality of lenses, each capable of refracting a laser beam therefrom of a selected length; and positioning said assembly so that a selected one of said lenses receives a laser beam from said laser device and refracts it against a predetermined length of said tubing.
4.
The method of pulling micropipettes comprising the steps of: providing means for gripping a length of glass tubing at spaced points along the length thereof and applying forces to pull said gripping means apart; providing a laser device for directing a laser beam; providing a zoom lens device capable of refracting a laser beam therefrom of a selected length; and positioning said zoom lens to receive a laser beam from said laser device and refract it against a predetermined length of said tubing.

Description:
BACKGROUND OF THE INVENTION This invention relates to micropipette pullers of the type shown in my earlier U.
S.
Pat.
No.
4,600,424 granted July 15, 1986.
Micropipette pullers generally employ a filament comprising a heated metal band or wire bent into a ring to surround the glass tubing and heat it to its melting point

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