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Method of producing a probe for aspirating and dispensing probe having surface sensing capability

  • US 5,843,378 A
  • Filed: 01/29/1997
  • Issued: 12/01/1998
  • Est. Priority Date: 09/05/1995
  • Status: Expired due to Fees
First Claim
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1. A method of producing a probe for aspirating and dispensing liquid, the method comprising the steps of:

  • a) providing an electrically insulative tube, an electrically conductive fluid conduit, and an electrically conductive rod, the tube having upper and lower ends, a heat-shrinkable outer layer, a meltable inner layer, and a central bore extending the length of the tube, the inner layer having a lower melting point than the outer layer, the conduit having an inlet end, a discharge end, and a middle section between the inlet and discharge ends, and the rod having a contact end, a sensing end, and a middle portion between the contact and sensing ends;

    b) positioning the conduit and the rod in the central bore such that the inlet end of the conduit and the contact end of the rod protrude from the upper end of the tube and such that the discharge end of the conduit and the sensing end of the rod protrude from the lower end of the tube; and

    c) heating the tube such that the outer layer shrinks and the inner layer melts to encapsulate the middle section of the conduit and the middle portion of the rod, wherein the outer layer shrinks and the inner layer melts to form in the tube a longitudinal waist between the conduit and the rod, and wherein the middle section of the conduit and the middle portion of the rod are encapsulated such that the conduit is electrically insulated from the rod.

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