Shield-Activated Fixed-Dose Injector Locking to Prevent Double Dosing
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Solution Overview
Problem
Existing drug delivery devices for fixed doses are complex, prone to user error, and inefficient in terms of material usage, with a need for simpler, safer, and more robust devices that prevent unintentional activation and double dosing.
Innovation Solution
A shield-activated drug delivery device with a locking-and-resetting mechanism that includes a drive element, activation mechanism, and a return spring to ensure each dose is delivered accurately and prevents unintentional activation, using a drive element that rotates and axially advances a piston rod, and a shield that locks and resets to prevent double dosing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If a shield activated device is designed to deliver multiple fixed doses, then the device can reduce material usage and costs, but the risk of unintentional activation and double dosing increases
Solution Approach 1:
The patent applies preliminary anti-action by implementing a locking mechanism that proactively prevents unintentional activation before it can occur. The shield is locked in a blocked position that cannot be accidentally activated, and only releases when intentionally pressed by the user during a controlled injection sequence. This preemptive locking mechanism eliminates the risk of double dosing while enabling multiple dose delivery.
Solution Approach 2:
The patent uses an intermediary mechanism - the locking mechanism - that stands between the shield and the drive mechanism. This intermediary component controls the connection between the shield's pressing action and the dose delivery function, ensuring that the shield can only activate the drive mechanism when properly positioned and intended, thereby preventing accidental activation while allowing multiple doses.
2Reliability
If a locking mechanism is added to prevent unintentional activation, then safety is improved, but device complexity increases
Solution Approach 1:
The patent merges the locking mechanism with existing components of the shield and drive mechanism assembly. The locking elements are integrated into the shield structure and its interaction with the drive mechanism, rather than adding completely separate components. This merging approach provides the necessary safety functionality while minimizing the increase in overall device complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The device provides a user-friendly, safe, and robust solution for delivering multiple fixed doses, ensuring accurate dosing without unintentional activation or double dosing, while reducing material waste and device complexity.
Implementation Method 1
a return spring, a locking-and-resetting structure biased in the distal direction by the return spring
Data Source
AI summary
A shield activated drug delivery device for delivering a plurality of fixed doses comprising a housing, a drive mechanism comprising a drive element (180, 280) adapted to rotate and thereby rotate and axially advance a piston rod (109, 209), wherein the drive mechanism is adapted to expel a dose of the plurality of fixed doses, in response to activation. The shield activated drug delivery device further comprises an activation mechanism, and a locking-and-resetting mechanism for releasably locking a shield in an activation position, in response to rotating the shield, and for inducing a rotational movement of the shield, in response to the drive element releasing a releasable lock.