Metallocene Valve Plate for Pharmaceutical Liquid Dispenser
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Solution Overview
Problem
Conventional liquid dispensers for pharmaceutical liquids face contamination issues due to the use of thermoplastic elastomers in the valve plate, which leads to additive leakage and contamination of the liquid in the pressure chamber, especially when the liquid is stored for extended periods.
Innovation Solution
The valve plate and pressure chamber surfaces in contact with the liquid are made from metallocene plastics, specifically olefinic polymers like cycloolefin copolymers, to minimize contamination by reducing additive leakage and maintaining purity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If thermoplastic elastomers are used for the valve plate to provide large surface area and deformability, then the valve can open at low excess pressure, but the additives in the elastomer leak into the liquid causing contamination
Solution Approach 1:
The patent changes the material parameter of the valve plate from thermoplastic elastomer to metallocene plastic. This material substitution maintains the necessary deformability and surface area properties while eliminating the harmful additive leakage that causes liquid contamination, thus resolving the contradiction between ease of operation and harmful factors.
Solution Approach 2:
The patent employs metallocene plastic as a specialized material that combines the desirable mechanical properties (deformability, surface area) of elastomers with the advantage of chemical purity. This composite material solution allows the valve to function properly while preventing contamination of the pharmaceutical liquid.
2Productivity
If the pressure chamber has small volume relative to surface area, then the liquid is quickly pressurized for dispensing, but contamination concentration becomes highest in the pressure chamber
Solution Approach 1:
The patent changes the material parameter of the pressure chamber from conventional plastic to metallocene plastic. This maintains the small volume-to-surface-area ratio necessary for quick pressurization while eliminating the additive leakage problem, thus preventing contamination concentration in the pressure chamber.
3Duration of action of stationary object
If the dispenser is not used for long periods, then storage is possible, but contamination accumulates in the pressure chamber liquid
Solution Approach 1:
The patent changes the chemical stability parameter of the contact surfaces by using metallocene plastics instead of conventional thermoplastic elastomers. This material substitution prevents additive leakage over time, allowing the dispenser to be stored for long periods without contamination accumulation in the pressure chamber liquid.
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 use of metallocene plastics significantly reduces contamination in the pressure chamber, ensuring the pharmaceutical liquid remains pure during storage and dispensing, even when the dispenser is not in use for long periods.
Implementation Method 1
The use of metallocene plastics significantly reduces contamination in the pressure chamber, ensuring the pharmaceutical liquid remains pure during storage and dispensing
Data Source
AI summary
Liquid dispenser for discharging pharmaceutical liquids, having a housing, an outlet opening and an outlet valve assigned to the outlet opening. The outlet valve includes a pressure chamber arranged upstream of a valve opening and delimited to one side by a valve plate of a valve body. By increasing the pressure in the pressure chamber, the valve can be opened. The pressure chamber has a flat form and has a large surface area in contact with liquid in relation to the volume.At least one portion of the valve plate which is in contact with liquid in the pressure chamber is of a valve plate material produced using metallocenes as catalysts.