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Hand-held pipetter

  • US 4,195,526 A
  • Filed: 02/09/1978
  • Issued: 04/01/1980
  • Est. Priority Date: 02/09/1978
  • Status: Expired due to Term
First Claim
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1. A pipetter for controllably drawing a volume of fluid from a supply into a capillary tube, comprising:

  • a housing having a first and a second end and a support surface extending therebetween;

    a resilient tube disposed in said housing and extending over said support surface;

    adapter means for replaceably receiving a sampling pipe to be filled with a fluid, said adapter means defining a passage for coupling the interior of the sampling pipe with the interior of said tube;

    compression wheel means for compressing said tube against said support surface at a point intermediate the ends thereof, said compression wheel means being adapted to be moved with respect to said support surface by the user of the pipetter;

    mounting means in said housing for guiding said compression wheel means in a direction generally parallel to said support surface;

    whereby the point at which said tube is compressed may be continuously varied to create a lowered pressure in said adapter passage; and

    means to preclude substantial compression of said tube at one position of said wheel, whereby said tube relaxes to its uncompressed state when said wheel is in said position.

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