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VARIABLE RATE CONTROLLED DELIVERY DRIVE MECHANISMS FOR DRUG DELIVERY PUMPS

  • US 20150217045A1
  • Filed: 08/29/2013
  • Published: 08/06/2015
  • Est. Priority Date: 08/29/2012
  • Status: Active Grant
First Claim
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1. A variable rate controlled delivery drive mechanism comprises:

  • a drive mechanism housing, at least partially within which initially resides a biasing member positioned in an initially energized state within an inner cavity of a piston;

    a gear drive having a gear and a substantially axial internal pass-through;

    a first screw which at least partially resides within the axial internal pass-through, said first screw also having a substantially axial pass-through and an external first pitch wherein the external first pitch is configured to engage a first nut which also resides within the internal pass-through of the gear drive;

    a second nut configured to engage a second screw having an external second pitch, said second nut positioned within an axial post of a piston, said axial post and second nut positioned to reside at least partially within the axial pass-through of the first screw;

    wherein the piston has an interface surface adjacent to a plunger seal and is configured to axially translate the plunger seal, by force asserted upon it from the biasing member, from a first position to a second position within a drug container for drug delivery, and wherein the biasing member is metered from free expansion from its energized state.

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