Multi-stroke delivery pumping mechanism for a drug delivery device for high pressure injections

摘要

A dual-chambered drug delivery device (201) includes a cartridge (211) having a first chamber (212) for storing a medicament and a second chamber (211) in fluid communication with the first chamber (212). A dose setting member (241) is used to set a medicament dose to be injected at an injection site. A piston (281) is disposed in the second chamber (221). An upward stroke of the piston (281) draw a portion of the medicament dose into the second chamber (221) and a downward stroke of the piston (281) expels the portion of the medicament dose. A needle (205) communicates with the second chamber (221) for sequentially injecting the portions of the medicament dose into the injection site.

主权项

1. A dual-chambered drug delivery device, comprising:
a cartridge having a first chamber for storing a medicament; a second chamber in fluid communication with said first chamber, a centerline of said first chamber being substantially parallel to and offset from a centerline of said second chamber; a rotating dose setting member for rotatably setting a medicament dose to be injected at an injection site, said dose setting member being mechanically decoupled from said first chamber and said dose setting member being disposed external to said second chamber; a piston disposed in said second chamber, an upward stroke of said piston drawing a portion of the medicament dose into said second chamber and a downward stroke of said piston expelling the portion of the medicament dose; and a needle communicating with said second chamber for sequentially injecting portions of the medicament dose into the injection site.