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Liquid handling tool having porous plunger

  • US 7,438,857 B2
  • Filed: 07/18/2003
  • Issued: 10/21/2008
  • Est. Priority Date: 07/23/2002
  • Status: Expired due to Fees
First Claim
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1. A material handling tool, comprising:

  • a tool body;

    a plurality of needles mounted to the tool body, each of the plurality of needles constructed and arranged to remove material from a work area and deposit material on a work area;

    a plurality of plungers moveable in the tool body, each of the plurality of plungers associated with a corresponding one of the plurality of needles, wherein each of the plungers has a passageway that allows fluid flow through the plunger; and

    a controller constructed and arranged to individually address each of the passageways so that flow in each of the passageways is individually controlled, wherein the controller comprises a plurality of actuators, each of the actuators including a membrane valve that controls fluid flow with respect to a corresponding passageway and is capable of opening and closing a corresponding passageway, and a plurality of drive switches that controls flow through a passageway opened by an actuator.

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