Anti-rotation feature for infusion pump cartridge

  • US 10,384,017 B2
  • Filed: 02/28/2014
  • Issued: 08/20/2019
  • Est. Priority Date: 10/02/2007
  • Status: Active Grant
First Claim
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1. A system for rotating a rotary drive element in a cylindrical vial, the system comprising:

  • the cylindrical vial comprising a proximal end, a distal end, and an opening in said proximal end; and

    the rotary drive element;

    the rotary drive element comprising;

    a cylindrical cog with a plurality of circumferential protrusions, said cylindrical cog being disposed at least partially outside of said opening in said proximal end of the cylindrical vial;

    a first threaded element joined to said cylindrical cog and extending toward said distal end of the cylindrical vial, said first threaded element at least partially extending into said opening in said proximal end of the cylindrical vial, said first threaded element having a threaded portion;

    said first threaded element and said cylindrical cog being rotatable with respect to the cylindrical vial but substantially linearly immobile with respect to the cylindrical vial; and

    a second threaded element threadably coupled to said threaded portion of said first threaded element, said second threaded element positioned entirely within the cylindrical vial;

    wherein rotating said cylindrical cog causes said first threaded element to rotate with respect to said second threaded element, linearly advancing said second threaded element with respect to the cylindrical vial; and

    wherein said first threaded element fits into said opening such that a surface of said first threaded element is in contact with a surface of the cylindrical vial.

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