Inhaler Damping System for Consistent Medicament Dosing
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Solution Overview
Problem
Inhalers for delivering medicaments by inhalation often face issues with inconsistent dosing due to user error in resetting the dispensing mechanism, leading to variations in the weight of the active ingredient delivered in subsequent doses.
Innovation Solution
An inhaler with a damping system that automatically returns the canister to its rest position within a predetermined time period, ensuring consistent dosing by maintaining the valve open long enough to dispense the entire dose and then refilling it quickly, without requiring user intervention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the canister is returned to rest position quickly after actuation, then the refill time is reduced and productivity is improved, but the valve may not have enough time to dispense the entire dose completely
Solution Approach 1:
The return mechanism dynamically adjusts the canister movement speed through two distinct phases: a first speed during initial return and a second, slower speed during final approach to rest position. This dynamic speed variation ensures the valve has sufficient time to complete dose dispensing while maintaining overall productivity
Solution Approach 2:
The return mechanism operates in periodic stages with different speed characteristics. The canister first returns at a higher speed, then transitions to a slower second speed for the final portion of the return journey, creating a periodic action pattern that balances refill efficiency with dose completeness
2Reliability
If the canister is returned to rest position slowly, then the valve has sufficient time to refill completely, but the time between doses increases and productivity decreases
Solution Approach 1:
The system dynamically varies the return speed rather than maintaining a constant slow speed. The canister returns quickly during the initial phase and slows down only during the critical final approach, achieving refill completeness without unnecessarily extending the total return time
Solution Approach 2:
The return mechanism employs periodic action with two speed phases, allowing the system to achieve reliable refill completeness while minimizing the overall time between doses, thus maintaining high dosing frequency
3Device complexity
If manual resetting is required after each dose, then the mechanism can be simple and cost-effective, but user error occurs and dosing consistency deteriorates
Solution Approach 1:
The return mechanism operates automatically without requiring user intervention. The canister self-returns to the rest position through the damping system, eliminating user error and ensuring consistent dosing while adding only moderate complexity to the device
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 inhaler ensures consistent and reliable delivery of medicament doses by automatically resetting the canister and valve, minimizing user error and maintaining optimal refill times, thus providing consistent medicament delivery across multiple doses.
Implementation Method 1
the return mechanism comprises a damping system, the damping system configured to enable the canister to automatically return from the actuating position to the rest position within a predetermined time period
Data Source
AI summary
An inhaler for delivery of a medicament by inhalation includes an inhaler body for receiving a canister having a dispensing valve. A drive mechanism is provided for driving the canister from a rest position in which the valve is closed to an actuating position in which the valve is open. A resetting mechanism is provided for resetting the drive mechanism. A return mechanism is provided for returning the canister from the actuating position to the rest position, wherein the return mechanism comprises a damping system that is configured to enable the canister to automatically return from the actuating position to the rest position within a predetermined time period. A method of operation of an inhaler is also disclosed.