Nasal Fluid Dispenser With Cannula-Piercing Insert Assembly
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Solution Overview
Problem
Existing nasal fluid product dispenser devices face issues with compatibility across different nose morphologies, particularly in children, and suffer from complex assembly and potential malfunction due to insert molding and sealing challenges, leading to variable spray properties.
Innovation Solution
A nasal fluid product dispenser device with a dispenser head and insert design featuring specific dimensions and projections for secure, sealed assembly, ensuring consistent spray geometry and simplified manufacturing, using a hollow insert with a cannula to pierce a stopper and connect to the dispenser orifice.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an insert is arranged in the dispenser head upstream from the dispenser orifice to produce spray, then spray function is achieved, but manufacturing complexity and risk of malfunction increase due to molding shrinkage and assembly difficulties
Solution Approach 1:
The insert is extracted from the dispenser head assembly and positioned separately within the reservoir. The dispenser head is simplified to contain only the orifice and stopper/piston, eliminating the complex insert structure from this component. This separation allows independent optimization of each part and simplifies assembly.
Solution Approach 2:
The device is segmented into distinct functional modules: reservoir with insert, dispenser head with orifice, and stopper/piston. The insert is separated from the dispenser head, allowing independent manufacturing and assembly. This modular segmentation reduces overall complexity and improves reliability by isolating potential failure points.
2Manufacturing precision
If the spray profile is defined between the insert and dispenser head, then spray function is achieved, but spray properties vary between devices due to assembly conditions
Solution Approach 1:
The spray profile definition is extracted from the assembly interface between insert and dispenser head, and relocated to the insert itself. The insert includes an integrated spray profile that is formed as part of its structure, eliminating dependence on assembly conditions and ensuring consistent spray properties across all devices.
Solution Approach 2:
The spray profile is defined by fixed geometric parameters of the insert (diameter, shape, position relative to orifice) rather than by the assembly interface. This allows the spray profile to be controlled by manufacturing the insert with precise dimensions, ensuring consistency independent of assembly variations.
3Reliability
If a hollow insert with cannula is used to pierce stopper and connect to dispenser orifice, then reliable fluid connection is achieved, but device complexity increases
Solution Approach 1:
The cannula and spray profile functions are merged into a single integrated insert component. The hollow insert combines the fluid conduit (cannula) with the spray profile geometry, eliminating the need for separate components. This merging reduces structural complexity while maintaining reliable fluid connection through the piercer mechanism.
Data Source
AI summary
A dispenser including a reservoir (10) containing fluid product, a head (20) provided with an opening (21), a piston (50) for dispensing at least one portion of the fluid product through the opening (21), the reservoir (10) being, before the dispenser is actuated, closed in sealed manner by the piston (50), the device including a hollow insert (60) inserted and fixed in the head (20), the insert (60) supporting a cannula (40) for piercing the piston (50) and thus connecting the container (10) to the opening (21) during actuation, wherein:the dispenser head (20) includes a proximal end portion (220) of reduced diameter the axial length of which is greater than 5 mm, advantageously greater than 6 mm, the maximum outside diameter of which is less than 8 mm, advantageously less than 7 mm, and the wall thickness of which is less than 1.1 mm, advantageously between 0.7 and 1.0 mm.