Piston Dosing Dispenser for Priming-Free Fluid Delivery
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Solution Overview
Problem
Existing devices for nasal delivery of fluid products require priming to replace air in the dosing chamber, leading to fluid loss and complexity in manufacturing and assembly.
Innovation Solution
A device design that eliminates the need for priming by using a piston that slides between high and low abutment positions to fill and dispense fluid, with dose separation means ensuring precise dosing without additional actuations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a pump with a dosing chamber is used to define the volume of the dose, then the dosing precision is improved, but the device requires priming to replace air in the dosing chamber, leading to fluid loss
Solution Approach 1:
The device is pre-filled with fluid product at the factory before sealing, so the dosing chamber is already filled with fluid rather than air. This preliminary action eliminates the need for priming by the user and prevents fluid loss that would occur during priming operations.
Solution Approach 2:
The protective cap is removed by the user immediately before use, allowing the pre-filled dosing chamber to be accessed without requiring additional priming actuations. This extraction of the protective cap at the optimal moment eliminates unnecessary fluid loss.
2Quantity of substance
If priming actuations are performed to fill the dosing chamber, then the dosing chamber is filled with fluid product, but additional fluid product is lost and the operation becomes more complex
Solution Approach 1:
The dosing chamber is pre-filled with the required quantity of fluid product during manufacturing, eliminating the need for user-performed priming actuations. This preliminary filling action simplifies the operation significantly.
Solution Approach 2:
The device is designed to be self-sufficient with the fluid already in the dosing chamber, requiring no additional service or priming operations by the user. The system serves itself by being pre-configured with the necessary fluid volume.
3Ease of manufacture
If the device is designed to eliminate priming, then manufacturing complexity is reduced, but the device must ensure accurate dosing without additional actuations
Solution Approach 1:
The dosing chamber is pre-filled with the exact required dose volume during manufacturing, eliminating the need for complex priming mechanisms. This preliminary dosing action maintains measurement precision while simplifying the overall device design and manufacturing.
Solution Approach 2:
The filling and dosing functions are merged into a single pre-filled dosing chamber, eliminating the need for separate priming and dosing operations. This merging simplifies the device structure while maintaining dosing accuracy through the pre-configured volume.
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 achieves efficient and cost-effective dispensing of fluid products without priming, ensuring accurate dosing and reducing manufacturing complexity.
Implementation Method 1
a piston, which is cohesive with said dispensing head, being adapted to slide in said dosing chamber between a high abutment position, in which the volume of said dosing chamber is maximal, and a low abutment position, in which the volume of said dosing chamber is minimal
Implementation Method 2
said dosing chamber comprises, on the lower axial side, an opening connected to said reservoir, in particular via a dip tube, said opening being closed by a closure element forming a valve which opens during filling of said dosing chamber and which closes from the start of each actuation
Implementation Method 3
a hollow rod is disposed in said dispensing head, said hollow rod defining a first portion of an expulsion channel connecting said dosing chamber to said dispensing orifice during the actuation
Data Source
AI summary
Device having a dispenser on a reservoir containing one or more doses of fluid product. The dispenser has a pump body containing a chamber and a head with an orifice with a removable cap. The head is axially displaceable with respect to the pump body. A piston cohesive with the head is adapted to slide in the chamber between a high abutment position, in which the volume of the chamber is maximal, and a low abutment position, in which the volume of the chamber is minimal. During fitting of the dispenser, the protective cap tightly closes the dispensing orifice and the piston is in its low abutment position. The chamber is filled with the fluid product by displacing the piston from its low abutment position towards its high abutment position, and the fluid product is dispensed by displacing the piston from its high abutment position towards its low abutment position.