Self-Lubricating Syringe Plunger Blend With UHMWPE Microspheres
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Solution Overview
Problem
Existing lubrication methods for syringe plunger surfaces, such as using silicone oils, are unsuitable for biologic drugs, cause adulteration, and introduce quality issues like migration and EHS concerns, while alternative methods are costly and complex.
Innovation Solution
Incorporating ultra-high molecular weight polyethylene microspheres into the base polymeric material of syringe plungers to create a self-lubricating blend, eliminating the need for external lubricants.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If silicone oils or hydrocarbon oils are applied as lubricants to syringe plunger surfaces, then gliding movement is improved, but the lubricants migrate, cause contamination, and are unsuitable for biologic drugs
Solution Approach 1:
The syringe plunger is made self-lubricating by incorporating lubricating microspheres directly into the plunger material during manufacturing. The microspheres are distributed throughout the plunger body and release lubrication locally at the interface with the barrel during operation, eliminating the need for external lubricant application and preventing migration issues
Solution Approach 2:
The plunger is constructed as a composite material combining a polymeric base matrix with dispersed lubricating microspheres. This composite structure integrates the mechanical properties of the base polymer with the lubricating function of the microspheres, creating a unified component that provides lubrication without requiring separate lubricant applications
2Force
If external lubricants are applied to reduce breakout and breakloose forces, then friction is reduced, but the lubricants are soluble in drug vehicles and can aggregate biologic drugs
Solution Approach 1:
The lubricating function is embedded within the plunger material itself through incorporated microspheres, eliminating the need for external lubricant application. This self-lubricating approach ensures that no soluble lubricants contact the drug vehicle, preventing drug aggregation while maintaining reduced friction during operation
Solution Approach 2:
The lubricating microspheres act as an intermediary substance that provides lubrication at the plunger-barrel interface without requiring external lubricant application. The microspheres are dispersed within the plunger matrix and release lubrication locally, serving as a bridge between the mechanical requirement for lubrication and the requirement to protect drug integrity
3Ease of operation
If conventional lubrication methods are used, then gliding is achieved, but manufacturing complexity and operational complexity increase due to lubricant application requirements
Solution Approach 1:
The plunger is designed to be self-lubricating through the incorporation of microspheres during manufacturing. This eliminates the need for separate lubricant application steps, reducing both manufacturing complexity and operational complexity while maintaining the gliding function
Solution Approach 2:
The lubricating microspheres are incorporated into the plunger material during the manufacturing process, performing the lubrication function in advance. This preliminary integration of lubrication capability eliminates the need for subsequent lubricant application steps, simplifying both manufacturing and operation
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
Provides adequate gliding forces for syringe plunger movement without lubricant migration, reducing contamination risks and operational complexity, suitable for biologic drugs.
Implementation Method 1
at least one microsphere additive that are added thereto to produce a self-lubricating effect in same
Data Source
AI summary
The invention relates, in general, to one or more blended polymeric materials that include therein at least one microsphere additive that are added thereto to produce a self-lubricating effect in same. In one embodiment, the at least one microsphere additive is formed from a suitable polyethylene compound and is added to a suitable base polymeric and/or rubber compound to produce a blended polymeric material that is self-lubricating. In one instance, the at least one polyethylene microsphere additive is formed from an ultra-high molecular weight polyethylene powder.