Fluidic Interface Needle and Body Design
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Fluidic interfaces in fluid ejection devices, such as printers, face challenges in maintaining the robustness of hollow fluidic needles to facilitate multiple connections with replaceable fluid supplies over the device's lifetime, as they need to withstand mechanical shocks and loads during repeated insertions.
Innovation Solution
The use of polymer-based compounds with different properties for the fluidic needle and body, where the needle is made of a harder compound with additives like carbon fibers for strength and the body of a less expensive compound with glass fibers for electrical isolation, ensures a strong bond and durability, allowing the needle to be securely retained within the body without additional adhesives or welding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the fluidic needle is made harder with carbon fiber additives to withstand mechanical shocks and repeated insertions, then the strength and durability of the needle is improved, but the manufacturing complexity and cost increase
Solution Approach 1:
The needle is constructed as a composite material consisting of a biodegradable polymer base (such as PLA, PGA, or PLGA) reinforced with carbon fiber additives. This composite structure provides the necessary mechanical strength and rigidity to withstand repeated insertions and mechanical shocks while maintaining the biodegradable properties of the base material.
Solution Approach 2:
The needle exhibits local quality variations through its composite structure, where carbon fiber reinforcement is strategically incorporated into the polymer matrix to provide localized strength enhancement at critical stress points, while other regions maintain the base polymer's biodegradability and flexibility characteristics.
2Reliability
If the needle is made more robust to facilitate many subsequent fluidic connections, then the reliability of repeated connections is improved, but the risk of deformation during insertion increases
Solution Approach 1:
The carbon fiber-reinforced polymer composite provides enhanced structural integrity and resistance to deformation during insertion while maintaining the needle's overall shape. The carbon fiber network distributes mechanical stresses uniformly, preventing localized buckling or bending that would compromise connection reliability.
Solution Approach 2:
The mechanical properties of the needle are optimized by adjusting the carbon fiber content and distribution within the polymer matrix, creating a material with enhanced stiffness and dimensional stability that resists deformation under repeated insertion forces while maintaining biodegradability.
3Adaptability or versatility
If different polymer compounds are used for the needle and body, then the functional requirements of each component are optimized, but the manufacturing process complexity increases
Solution Approach 1:
The needle uses a carbon fiber-reinforced biodegradable polymer composite providing strength and rigidity for mechanical insertion, while the body uses a separate biodegradable polymer material optimized for fluid containment and gradual degradation. This material differentiation allows each component to fulfill its specific functional requirements.
Solution Approach 2:
The fluidic interface is segmented into distinct components (needle and body) made from different polymer compounds, allowing independent optimization of each part's properties. The needle is manufactured with carbon fiber reinforcement for mechanical strength, while the body is manufactured from a biodegradable polymer suited for fluid containment and controlled degradation.
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
This design enhances the longevity and reliability of fluidic connections by providing a robust and cost-effective solution that maintains the needle's position within the body during repetitive insertions, ensuring consistent fluid flow and reducing the risk of deformation or failure.
Implementation Method 1
The wall is molded around the needle in the same mold as the needle. The cooling of the wall after molding compresses the needle base
Data Source
AI summary
A fluidic interface may include a fluidic needle of a first polymer based compound and a body wall that is to support the fluidic needle, the body wall of a second polymer based compound, different than the first polymer based compound.