Handheld Pharmaceutical Dispenser Counter Mechanism
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Solution Overview
Problem
Existing handheld devices for dispensing pharmaceutical substances often result in unintended double dosages due to the counter mechanism not registering the dispensing of the substance correctly, leading to user irritation from inaccurate counting.
Innovation Solution
A handheld device design where the counter wheel is activated before the pharmaceutical substance is dispensed, utilizing a concave course restoring spring that pivots around a pivot axis, ensuring a linear movement of the counter wheel occurs before substance dispensing, with a seesaw-like lever effect to advance the counting mechanism prior to substance delivery, preventing double dosages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the counter mechanism is positioned to register dispensing after substance delivery, then the device structure is simplified, but the counting accuracy deteriorates leading to double dosages
Solution Approach 1:
The counter wheel is actuated in advance before the substance dispensing occurs. The restoring spring is configured with a concave course that enables the counter wheel to rotate prior to the plunger delivering the substance, ensuring the count is registered before the dose is administered, thus preventing double dosing errors
Solution Approach 2:
The mechanism is divided into independent functional components: the counter wheel assembly, the restoring spring with concave course, the drive part, and the plunger system. This segmentation allows the counter actuation to be decoupled from the substance dispensing timing, enabling preliminary counting action without complicating the overall device structure
2Measurement precision
If the restoring spring has a straight course, then the manufacturing is simplified, but the counter actuation timing is inaccurate causing dosing errors
Solution Approach 1:
The restoring spring is designed with a concave course instead of a straight configuration. This curved geometry is specifically shaped to ensure that the spring exerts force on the counter wheel at the precise moment before substance dispensing, achieving accurate actuation timing. The concave curvature is manufactured as an integrated feature of the spring component
3Reliability
If the counter wheel is actuated after substance dispensing, then the sequence of operations is simplified, but the dosing reliability deteriorates due to unregistered doses
Solution Approach 1:
The counter wheel actuation is performed as a preliminary action before the substance dispensing takes place. The restoring spring's concave course is geometrically configured to engage the counter wheel drive part early in the actuation sequence, ensuring that the dose count is registered before the plunger delivers the medication, thereby guarantee dosing reliability
Solution Approach 2:
The restoring spring acts as an intermediary mechanism that couples the plunger actuation to the counter wheel rotation. Through its concave course geometry, it mediates the timing relationship between substance dispensing and counting, ensuring the counter is activated at the correct moment without requiring direct mechanical coupling that would increase 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
Ensures accurate counting and dispensing of pharmaceutical substances, preventing double dosages by ensuring the counter wheel is activated before substance delivery, thus eliminating user irritation from inaccurate counting.
Implementation Method 1
A handheld device design where the counter wheel is activated before the pharmaceutical substance is dispensed, utilizing a concave course restoring spring that pivots around a pivot axis, ensuring a linear movement of the counter wheel occurs before substance dispensing, with a seesaw-like lever effect to advance the counting mechanism prior to substance delivery
Data Source
AI summary
A handheld device for dispensing a pharmaceutical substance has a housing in which a storage container with the pharmaceutical substance and a counter are arranged. The storage container dispenses the pharmaceutical substance by pressure actuation by a user after a specified displacement path has been traversed, and the counter carries out an action in order to rotate a counter wheel of the counter on the basis of the displacement path being traversed. The counter additionally has a drive part rotates the counter wheel, and the counter wheel is rotatably attached to a mounting part. The mounting part is formed independently of the housing, and the drive part is directly attached to the mounting part. The handheld device advantageously dispenses a pharmaceutical substance in that the action is first carried out on the counter wheel of the counter upon the pressure actuation, and the pharmaceutical substance is then dispensed.