PMMA Bone Cement Paste Formulation for Immediate Application
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Solution Overview
Problem
Conventional PMMA bone cements require immediate mixing of components, which is prone to errors, and the user must wait for the cement to become tack-free before application, exposing them to monomer vapors and powdery particles, necessitating expensive vacuum systems and trained personnel.
Innovation Solution
A two-component PMMA bone cement with a soluble polymer dissolved in methacrylate monomers and insoluble particulate polymers, allowing for a non-sticky, self-hardening paste that can be mixed and applied immediately, reducing exposure to hazardous vapors and eliminating the need for complex mixing procedures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional PMMA bone cement components are mixed immediately before application, then the cement can be applied, but mixing errors occur and air bubbles form
Solution Approach 1:
The patent applies preliminary action by pre-mixing the polymer powder and monomer liquid in factory-prepared cartridges before use. This eliminates the need for manual mixing at the application site, preventing mixing errors and air bubble formation while maintaining ease of application through simple cartridge activation.
2Reliability
If vacuum mixing systems are used to prevent air bubbles, then mixing quality improves, but equipment cost and complexity increase
Solution Approach 1:
The patent eliminates the need for vacuum mixing equipment by performing the mixing action in advance during manufacturing. The pre-mixed cartridges contain thoroughly combined components free of air bubbles, allowing simple application without complex vacuum systems.
3Ease of operation
If the cement is allowed to become tack-free before application, then it can be shaped and applied, but waiting time is required
Solution Approach 1:
The patent performs the tack-free development phase in advance during cartridge manufacturing. The cement reaches its optimal consistency and becomes tack-free before being sealed in the cartridge, allowing immediate application upon activation without waiting time.
4Reliability
If trained personnel are used to mix cement properly, then mixing quality improves, but training costs increase
Solution Approach 1:
The patent transfers the mixing expertise from trained personnel to the manufacturing process. Factory-prepared cartridges contain pre-mixed components in optimal proportions, eliminating the need for trained operators and reducing training costs while maintaining high mixing quality.
5Ease of operation
If liquid monomer and powder are mixed manually, then application is possible, but exposure to monomer vapors and powdery particles occurs
Solution Approach 1:
The patent performs mixing in a controlled factory environment within sealed cartridges, preventing exposure to monomer vapors and powdery particles during application. The components remain sealed until activation, protecting users from hazardous substances.
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 solution enables easy, immediate application of PMMA bone cement without waiting for it to become tack-free, reducing mixing errors and exposure to hazardous substances, and can be stored in double cartridges for convenient use, thus improving user safety and efficiency.
Implementation Method 1
at least one polymethyl methacrylate copolymer soluble in the methacrylate monomer/methacrylate monomers
Implementation Method 2
at least one radical initiator and accelerator which insoluble in the methacrylate monomer/methacrylate monomers... one Non-sticky paste is created that hardens independently
Data Source
AI summary
Paste form polymethylmethacrylate (PMMA)-bone cement, comprises at least a paste form component (A) comprising (AI) a distillable, radically polymerizable methacrylate monomer, (AII) a polymer, (AIII) a particulate polymer with particle size of maximum of 500 mu m, which is insoluble in (AI) and (AIV) a radical initiator; and a paste form component (B1) comprising (BI) a distillable, radically polymerizable methacrylate monomer, (BII) a polymer soluble in (BI), (BIII) a particulate polymer with a particle size of maximum of 500 mu m, which is insoluble in BI, and (BIV) an accelerator. Paste form polymethylmethacrylate (PMMA)-bone cement, comprises at least a paste form component (A) comprising (AI) a distillable, radically polymerizable methacrylate monomer, (AII) a polymer soluble in (AI), (AIII) a particulate polymer with particle size of maximum of 500 mu m, which is insoluble in (AI) and (AIV) a radical initiator; and a paste form component (B1) comprising (BI) a distillable, radically polymerizable methacrylate monomer, (BII) a polymer soluble in (BI), (BIII) a particulate polymer with a particle size of maximum of 500 mu m, which is insoluble in BI, and (BIV) an accelerator.