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Fluid delivery apparatus and method of making same

  • US 5,649,910 A
  • Filed: 06/06/1995
  • Issued: 07/22/1997
  • Est. Priority Date: 06/16/1989
  • Status: Expired due to Term
First Claim
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1. A method of making a device for infusing medicinal fluid into a patient at a controlled rate, said device having a base provided with an upper surface including a central portion and a peripheral portion circumscribing the central portion, ullage-defining means disposed above said base, a distendable, elastomeric membrane superimposed over the base, a housing engageable with the base, and a cover covering the housing, the method comprising the steps of:

  • (a) gripping a peripheral portion of the distendable membrane in a manner to differentially stretch the membrane to produce a prestressed membrane;

    (b) subsequent to stretching the membrane placing the prestressed membrane over the ullage-defining means and the upper surface of the base;

    (c) emplacing the housing over the base and the prestressed membrane; and

    (d) sealably connecting the prestressed membrane and the housing to the base.

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