Drug delivery device
First Claim
Patent Images
1. A drug delivery device comprising:
- (a) a housing containing a drug reservoir;
(b) means for expelling drug from the drug reservoir;
(c) a ratchet mechanism in communication with the expelling means, the ratchet mechanism being operable to undergo incremental advancement and thereby drive the drug from the reservoir in a series of fixed increments, wherein the ratchet mechanism comprises a helical spring having coils, and one or more fingers which make a ratcheting engagement with the coils of the spring;
(d) a member operatively associated with the ratchet mechanism to cause the incremental advancement of said ratchet mechanism as the member moves in a first direction; and
(e) a delivery mechanism located within the housing and operable to expand a chamber, the member being in transmission relation to the chamber, whereby the member is driven by the movement of the chamber to advance the delivery helical spring and thereby drive the drug from the reservoir in the series of fixed increments, each of the fixed increments corresponding to a respective advancement of the ratchet mechanism.
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Abstract
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.
51 Citations
11 Claims
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1. A drug delivery device comprising:
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(a) a housing containing a drug reservoir; (b) means for expelling drug from the drug reservoir; (c) a ratchet mechanism in communication with the expelling means, the ratchet mechanism being operable to undergo incremental advancement and thereby drive the drug from the reservoir in a series of fixed increments, wherein the ratchet mechanism comprises a helical spring having coils, and one or more fingers which make a ratcheting engagement with the coils of the spring; (d) a member operatively associated with the ratchet mechanism to cause the incremental advancement of said ratchet mechanism as the member moves in a first direction; and (e) a delivery mechanism located within the housing and operable to expand a chamber, the member being in transmission relation to the chamber, whereby the member is driven by the movement of the chamber to advance the delivery helical spring and thereby drive the drug from the reservoir in the series of fixed increments, each of the fixed increments corresponding to a respective advancement of the ratchet mechanism. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification