Side-Actuation Dispenser with Spring-Loaded Rocker Switch
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Solution Overview
Problem
Existing side-actuation dispensers for pharmaceutical liquids face difficulties in precise drop dispensing due to air pockets, low overpressure requirements, and challenges in adapting to brand-specific designs, making them cumbersome to use and difficult to customize.
Innovation Solution
A side-actuation dispenser with a volumetrically variable pump chamber, a deformable membrane or piston, and a tilt button mechanism that allows for precise control over drop formation, along with a channel section insert to reduce air expulsion volume, and a modular housing design for aesthetic adaptation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the dispensing valve is designed to open at very low overpressure to expel air upon initial actuation, then air can be easily expelled from the pump chamber and discharge channel, but the valve may open unintentionally due to pressure fluctuations and precise drop dispensing cannot be achieved
Solution Approach 1:
The patent applies parameter changes by designing the dispensing valve to open at different overpressure thresholds depending on the liquid type. For pharmaceutical liquids without preservatives, the valve opens at lower overpressure (0.05-0.2 bar) to prevent contamination, while for liquids with preservatives, it opens at higher overpressure (0.3-0.5 bar) to ensure precise drop dispensing. This dynamic parameter adjustment resolves the contradiction between ease of air expulsion and dispensing precision.
2Ease of operation
If the pump chamber has a large volume to facilitate air expulsion, then air can be easily removed from the system, but the coordination between pump chamber and drop-forming means becomes less precise
Solution Approach 1:
The patent specifies precise volume parameters for the pump chamber (20-50 μl) and coordinates these with the drop-forming means geometry. This parameter optimization allows sufficient volume for air expulsion while maintaining precise coordination with the drop-forming surface, resolving the contradiction between ease of air removal and manufacturing precision.
3Ease of manufacture
If the dispenser is designed with fixed housing and button geometry, then manufacturing is simplified, but adaptation to different brand designs and customer requirements becomes difficult
Solution Approach 1:
The patent segments the dispenser into modular components: a standardized functional core (pump chamber, valves, discharge channel) and customizable external elements (housing, actuating button, drop-forming means). This segmentation allows the functional core to be manufactured efficiently while enabling adaptation of external components to different brand designs and customer requirements, resolving the contradiction between ease of manufacture and adaptability.
4Measurement precision
If the actuating button requires precise thumb pressure for drop dispensing, then individual drop formation is achieved, but the device becomes difficult to operate accurately
Solution Approach 1:
The patent implements self-service through the spring mechanism that automatically returns the actuating button to its initial position after each actuation. This eliminates the need for the user to manually reset the button, reducing operational complexity while maintaining precise drop formation control through the standardized button geometry and spring force.
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
Enables precise and efficient dispensing of pharmaceutical liquids as individual drops with improved ease of use and adaptability to different brand designs, reducing the need for high overpressure and facilitating easier assembly and customization.
Implementation Method 1
The dispenser has a spring device that acts on the actuating button in a force coupling area and pushes it back toward the initial position
Implementation Method 2
Pressing the actuating button reduces the size of the pumping chamber, in particular by displacing the piston or the diaphragm part transversely to the main direction of extension
Implementation Method 3
The inlet valve is closed when the pressure in the liquid reservoir and in the pumping chamber are identical and preferably opens when there is a negative pressure of approximately 0.1 to 0.2 bar in the pumping chamber
Implementation Method 4
The outlet valve is closed when the pressure in the pump chamber and the adjoining discharge channel is identical, and preferably opens when the pressure in the pump chamber exceeds approximately 0.5 bar
Implementation Method 5
beyond the dispensing opening, i.e., an area in which the dispensed liquid collects until the dispensed volume is sufficient to form a drop, which detaches from the drop-forming means due to gravity
Data Source
Figure 1A~1B
Figure 2A~2B
Figure 3~4
AI summary
Improvements are proposed for a dispenser (10) for dispensing pharmaceutical liquids, particularly in the form of single drops. Such a dispenser (10) is designed as a side-actuation dispenser with an actuation button (70) located laterally on a surface (54) of the housing and includes a liquid reservoir (14), a pump unit (16) with a volumetrically variable pump chamber (20), and a dispensing opening (28) for dispensing the liquid. The primary proposed improvements are the design of the actuation button as a spring-loaded rocker switch, the reduction of the liquid channel volume by means of an insert, and a special housing design to adapt the dispenser to customer requirements.