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Fluid pump without dead volume

  • US 5,746,728 A
  • Filed: 09/27/1995
  • Issued: 05/05/1998
  • Est. Priority Date: 10/03/1994
  • Status: Expired due to Fees
First Claim
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1. A pump for the delivery of a fluid contained in an elastic phial, comprising:

  • a pump body having a front end on a fluid outlet side, said front end comprising an outlet orifice (11) normally sealed off by an elastic membrane (24), and continuing backwards through a pump duct (18) with a fluid inlet orifice (15);

    a movable piston fitted inside the pump body, the relative displacement of an end (2) of the piston in relation to the pump body between the inlet orifice (15) and a stop (16) position located towards the outlet orifice (11) thus determining the quantity of fluid expelled on displacement, the end (2) of the piston fitting hermetically by slight friction against the pump duct (18), the inlet orifice (15) being of a sufficient size for only the preset quantity of fluid to be trapped in an end of the pump duct (18) for its expulsion through the outlet orifice (11) and a separable seam defined by interface of said outlet orifice (11) and said elastic membrane (24), the pump body and the piston being totally enveloped by the elastic phial, with the exception of the front end of the pump body.

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