Dry Powder Inhaler Lid Spooling for Reliable Dose Peeling
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Solution Overview
Problem
Conventional medicament dispensers for dry powder inhalation devices face issues with complex mechanisms that lead to mechanical failures, such as misfeeding and over-tensioning of elongate form medicament carriers, resulting in inconsistent and unreliable dose delivery.
Innovation Solution
A medicament dispenser with a power spring mechanism that tensions and peels the lid elongate sheet from the blister elongate sheet upon actuation, using a power spring mechanism to spool the lid sheet onto a bobbin, while maintaining optimal tension and preventing premature exposure of medicament doses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If flexible spring arms are used to maintain tension on the lid sheet, then tension control is improved, but device complexity increases and reliability decreases due to mechanical failures
Solution Approach 1:
The patent removes the flexible spring arms and capstan mechanism from the device, extracting the complex tension control system that caused mechanical failures. Instead, a simplified take-up spool mechanism is used to wind and store the used lid sheet, eliminating the sources of misfeeding and over-tensioning while maintaining reliable operation.
Solution Approach 2:
The patent separates the functions of tension control and sheet storage by using a dedicated take-up spool that winds the used lid sheet onto itself. This segmentation eliminates the need for complex spring-based tensioning mechanisms, reducing device complexity while maintaining reliability through a simpler, more robust design.
2Manufacturing precision
If the lid sheet is held taut during peeling, then dose release accuracy is improved, but the lid sheet may stretch, break or release the dose too early
Solution Approach 1:
The patent employs a dynamic take-up spool mechanism that winds the used lid sheet during the peeling process. This dynamic winding action provides controlled tension that maintains dose release accuracy while preventing over-tensioning, stretching, or premature breaking of the lid sheet through progressive tension application.
Solution Approach 2:
The take-up spool acts as an intermediary mechanism between the peeling action and the lid sheet tension control. By winding the used lid sheet onto the spool, it provides gradual and controlled tensioning that ensures accurate dose release without compromising lid sheet integrity or causing premature dose exposure.
3Quantity of substance
If the effective winding surface of the hub increases during winding, then sheet storage capacity is improved, but tension compensation becomes complex
Solution Approach 1:
The take-up spool is designed to wind the used lid sheet onto itself, with the increasing winding diameter automatically providing the necessary tension compensation. As the spool accumulates more sheet, the natural increase in winding radius provides progressive tension relief without requiring additional compensation mechanisms, maintaining both storage capacity and simplicity.
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 solution provides a robust, user-friendly, and efficient mechanism for delivering multiple medicament doses without rucking or over-tensioning, ensuring consistent and reliable dose delivery while maintaining medicament integrity.
Implementation Method 1
a power spring mechanism to spool the lid sheet onto a bobbin
Implementation Method 2
a power spring mechanism for winding the lid elongate sheet, wherein the power spring mechanism tensions and peels a segment of the lid elongate sheet
Data Source
AI summary
A medicament dispenser, and a method of assembling a medicament dispenser, for holding at least one elongate form medicament carrier having blister and lid elongate sheets enclosing multiple distinct medicament dose portions therebetween. The medicament dispenser has a dispensing mechanism which is adapted to operate, upon each actuation thereof, to dispense medicament active from the medicament dose portion. Moreover, the mechanism has at least one power spring mechanism for winding the lid elongate sheet, wherein the at least one power spring mechanism has at least one spring having an inner end about which the spring unwinds, and at least one shaft at which the inner end of at least one spring is secured. Furthermore, the power spring mechanism tensions and peels a segment of lid elongate sheet peeled from a corresponding segment of blister elongate sheet upon each actuation of the medicament dispenser.