Universal PMMA Bone Cement Viscosity Control
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Solution Overview
Problem
Current polymethyl methacrylate (PMMA) bone cements have fixed mixing ratios, limiting the medical user's ability to adjust the initial viscosity according to their needs, and require multiple specialized cement powders for different viscosities, which is inconvenient and costly.
Innovation Solution
A universal PMMA bone cement kit comprising components A and B, where component A includes a powdered polymethyl methacrylate copolymer with a specific molecular weight and radiopaque, and component B includes a free-radically polymerizable monomer, allowing the weight ratio of A to B to be adjusted from 2.0 to 3.4:1 to control the initial viscosity of the cement paste, eliminating the need for multiple specialized powders.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple specialized cement powders are used for different viscosities, then the viscosity requirements can be met, but the device complexity and cost increase
Solution Approach 1:
The patent develops a universal PMMA bone cement powder composition that can produce cements with different viscosities by adjusting the mixing ratio with monomer liquid. The powder contains polymethyl methacrylate copolymer particles with specific molecular weight (200,000-1,000,000 g/mol) and controlled initiator content (0.5-2.0 wt%), allowing a single powder formulation to serve multiple viscosity requirements when mixed in varying proportions (2:1 to 3.4:1 weight ratios).
Solution Approach 2:
The patent changes the mixing ratio parameter of powder to monomer liquid to control the initial viscosity of the bone cement. By adjusting the weight ratio from 2:1 to 3.4:1, the initial viscosity can be controlled within the range of 100-500 Pa·s. This parameter change approach allows a single universal powder to produce cements with different viscosity characteristics suitable for various surgical applications.
2Ease of manufacture
If fixed mixing ratios are used, then the manufacturing process is simple, but the adaptability to different surgical needs is limited
Solution Approach 1:
The patent introduces dynamic adjustability to the mixing ratio, allowing the proportion of powder to monomer liquid to be varied within a specific range (2:1 to 3.4:1) rather than being fixed. This dynamic approach enables surgeons to select the appropriate viscosity by adjusting the mixing ratio according to surgical requirements, while the universal powder composition maintains consistent quality across different mixing ratios.
3Manufacturing precision
If multiple specialized powders are used, then the viscosity can be precisely controlled, but the cost and storage requirements increase
Solution Approach 1:
The patent merges multiple specialized powder formulations into a single universal PMMA bone cement powder composition. This universal powder contains polymethyl methacrylate copolymer particles with controlled molecular weight (200,000-1,000,000 g/mol), specific initiator content (0.5-2.0 wt%), and appropriate particle size distribution. By combining the functions of multiple specialized powders into one, the system reduces storage requirements and simplifies inventory management while maintaining the ability to produce cements with different viscosities through mixing ratio adjustment.
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
Enables the adjustment of initial viscosity from low to high, allowing for a wide range of bone cement properties, including flexural strength, modulus, and compressive strength, improving the quality and versatility of the cement.
Implementation Method 1
wherein component A is in powder form and comprises (a.1) at least one powdered polymethyl methacrylate copolymer, (a.2) at least one powdered X-ray opaque, and (a.3) at least one polymerization initiator; and Component B is present as a liquid and comprises (b.1) at least one radically polymerizable monomer, (b.2) optionally at least one polymerization accelerator
Data Source
Figure 1a~1b
AI summary
The invention relates to a polymerizable polymethyl methacrylate bone cement in which the initial viscosity of the cement paste can be controlled. The polymerizable bone cement comprises a composition comprising a radically polymerizable monomer, a powdered polymethyl methacrylate copolymer soluble in the monomer or a mixture comprising polymethyl methacrylate copolymers, a polymerization initiator, and an X-ray opaque, wherein the powdered polymethyl methacrylate copolymer comprises at least one particulate polymethyl methacrylate copolymer with a molar mass greater than or equal to 200,000 g/mol, and the polymethyl methacrylate polymer copolymer is obtained by polymerizing a mixture of greater than or equal to 90.0 wt% methyl methacrylate and less than or equal to 10.0 wt% methyl methacrylate.-% of one or more comonomers, wherein the weight ratio of component A comprising polymethyl methacrylate copolymer, a radiopaque and a polymerization initiator, in particular dibenzoyl peroxide, to component B comprising a radically polymerizable monomer, a stabilizer and a polymerization accelerator, in particular an aromatic amine, is of about 2.0 to 3.4 to 1.0 to control the initial viscosity of the bone cement paste formed by mixing the aforementioned components A and B.