Drug delivery device

摘要

A drug delivery device having a housing containing a gas generator controlled by an electronic controller. The gas generator generates gas into a reciprocable chamber, whereby reciprocation of the chamber causes a lever to reciprocate a pawl, and this action causes a ratchet to undergo incremental advancement. The device may also be provided with manual control for delivering a bolus dose of drug when necessary.

主权项

1. A wearable drug delivery device, comprising:
a housing with an adherent patient surface for placing on a patient, and a reservoir disposed within the housing; a cannula in fluid communication with the reservoir and movable relative to the patient surface between a retracted position within the housing and an exposed position in which at least a portion of the cannula extends through the patient surface outside of the housing; a piston slidably supported within the reservoir and operable to expel a drug from the reservoir; a first drive member movably disposed within the housing and having a first portion; and a second drive member at least partially disposed within the reservoir and having a second portion that is slidingly engageable with the first portion of the first drive member; wherein the first and second drive members cooperate to slidably displace the piston in a first linear direction to expel a drug from the reservoir; and wherein the first drive member engages the second drive member to prevent the piston from moving in a second direction opposite to the first linear direction.