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Infusion pumps

  • US 9,216,249 B2
  • Filed: 09/24/2010
  • Issued: 12/22/2015
  • Est. Priority Date: 09/24/2010
  • Status: Active Grant
First Claim
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1. An infusion pump apparatus, comprising:

  • a medicament cartridge including a medicament reservoir, a plunger, an outlet port and a seal that seals the outlet port; and

    an infusion pump assembly includinga housing having a cartridge receiving area,a plunger pusher in the housing,a drive mechanism, that drives the plunger pusher and has a motor, a lead screw, a gear assembly operatively positioned between the motor and the lead screw, and an encoder, anda controller to control the operation of the motor;

    wherein the medicament cartridge is insertable through an opening in the housing and into the cartridge receiving area to an inserted position where the plunger is proximate to but spaced from the plunger pusher; and

    wherein the controller executes, with the medicament cartridge in the inserted position, a plunger pusher zeroing procedure including causing the motor to advance the plunger pusher to contact the plunger while the seal is sealing the outlet port and then to back the plunger pusher off a predetermined distance from the plunger.

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