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Fluid dispenser having a housing and flexible inner bladder

  • US 7,000,806 B2
  • Filed: 07/12/2004
  • Issued: 02/21/2006
  • Est. Priority Date: 10/23/2000
  • Status: Expired due to Term
First Claim
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1. A dispenser for dispensing a fluid, comprising:

  • a housing; and

    a flexible bladder mounted within the housing and defining an interior chamber within the flexible bladder, and a fluid-receiving chamber between the flexible bladder and the housing; and

    first means for creating a first pressure within the fluid-receiving chamber greater than a second pressure within the interior chamber of the bladder and thereby preventing the ingress of gases or vapors into the fluid-receiving chamber,wherein the bladder is capable of being penetrated by a needle or like injection member for introducing a predetermined substance into the fluid-receiving chamber, and the bladder includes a first portion substantially infusible in response to the application of thermal energy thereto and compatible with the substance to be received within the fluid-receiving chamber, and a second portion overlying the first portion and fusible in response to the application of thermal energy thereto for forming a substantially fluid-tight seal between the flexible bladder and fluid-receiving chamber in a region thereof penetrable by the needle or like injection member.

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