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Self-driven pump assembly and method of operation

  • US 4,539,004 A
  • Filed: 04/23/1984
  • Issued: 09/03/1985
  • Est. Priority Date: 09/22/1982
  • Status: Expired due to Term
First Claim
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1. A pump assembly for delivering small amounts of a fluid for a prolonged period of time comprising, in combination:

  • (a) fluid impermeable container means provided with outlet means;

    (b) fluid imbibing pump means mounted within said container means the outlet of said pump means being in fluid communicating relationship to the outlet in said container means, the interior of said container means and the exterior of said pump means defining therebetween a fluid receiving volume sufficient, when charged with actuating fluid to actuate said pump; and

    (c) at least a portion of said fluid impermeable container means being formed from a flexible, collapsible, impermeable material which portion has a collapse capacity at least equal to the discharge capacity of said fluid imbibing pump, whereby imbition of fluid contained within the fluid receiving volume during actuation of said pump means will not create a vacuum of said fluid imbibing pump means.

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