Automated Bone Cement Mixer Using Sonication
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Solution Overview
Problem
Current methods for mixing bone cement, such as manual mixing and vacuum devices, result in inconsistent and non-uniform products due to air bubble entrapment and manual handling, which affects the mechanical properties and introduces potential contamination.
Innovation Solution
A device and method that automates the mixing of powdered and liquid components using sonication and vacuum, with controlled vibration frequencies to achieve consistent porosity and mechanical properties, minimizing manual handling and exposure to non-sterile environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If manual mixing is used, then ease of operation is improved, but manufacturing precision deteriorates due to non-uniform mixing and air bubble entrapment
Solution Approach 1:
The patent replaces manual mechanical mixing with an automated mixing device that uses mechanical agitation mechanisms. The device includes a mixing chamber with a rotating mixing element that automatically combines the liquid and powder components, eliminating the need for manual spatula mixing while ensuring uniform mixing without air bubble entrapment.
Solution Approach 2:
The mixing device is designed to automatically perform the mixing function without requiring continuous manual intervention. The device self-regulates the mixing process through automated control systems that manage the mixing speed, duration, and intensity, allowing the system to serve itself in achieving consistent mixing results.
2Manufacturing precision
If vacuum mixing devices are used, then porosity is reduced, but device complexity increases due to additional vacuum system components
Solution Approach 1:
The patent extracts and eliminates the vacuum system from the mixing device, replacing it with a simpler atmospheric pressure mixing mechanism. The design removes the complex vacuum pump, seals, and pressure control systems while achieving effective mixing through gravity-assisted flow and mechanical agitation alone.
Solution Approach 2:
The mixing device is segmented into distinct functional modules: a mixing chamber, a powder delivery system, and a liquid reservoir. Each component is independently designed and connected through simple interfaces, reducing overall system complexity while maintaining effective mixing functionality through modular architecture.
3Ease of operation
If removable stirrers are used, then ease of operation is improved for cleaning, but reliability deteriorates due to exposure to non-sterile surroundings and contamination risk
Solution Approach 1:
The mixing chamber is constructed as a sealed, disposable plastic container that maintains sterility throughout the mixing process. The flexible plastic material allows for complete sealing of all components, preventing exposure to non-sterile environments while enabling easy disposal after use, thus maintaining reliability without compromising cleaning accessibility.
Solution Approach 2:
The mixing chamber and associated components are designed as disposable single-use items made from inexpensive plastic materials. After one use, the entire mixing assembly is discarded, eliminating the need for complex sterilization and cleaning procedures while ensuring consistent sterility for each mixing operation.
4Manufacturing precision
If automated mixing is implemented, then manufacturing precision is improved for consistency, but device complexity increases due to automation components
Solution Approach 1:
The patent combines multiple mixing functions into a single integrated device that performs powder delivery, liquid mixing, and agitation through one unified mechanism. The automated mixing head integrates the powder dispenser, liquid injector, and mixing element into a single component that achieves consistent mixing results without requiring separate automated systems for each function.
Solution Approach 2:
The mixing device is designed with universal applicability to work with different bone cement formulations and viscosities. The automated mixing mechanism can adjust its parameters to handle various material types, making the device multi-functional without requiring complex reconfiguration systems, thus achieving consistency across different applications with moderate device complexity.
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 provides a consistent and controlled mixing process, reducing porosity and enhancing the mechanical properties of bone cement, while minimizing the risk of infection and contamination, and allowing for precise control over viscosity and porosity for various applications.
Implementation Method 1
sonication of the contents. A mixing chamber holds a liquid component of a mixture, while a flexible compartment holds a powdered component of the mixture. The combined powder and liquid components are sonicated until a desired mixture is created.
Implementation Method 2
vacuum mixing devices have been introduced where the mixing is performed in a closed container under vacuum to reduce porosity in the bone cement.
Data Source
AI summary
A device and related method for mixing a powdered component and a liquid component with minimal user interaction are described. A powdered component and a liquid component are separately fed into a mixing chamber. The powdered component may be released into the liquid component by removing a barrier. Alternatively, the two components are drawn into the mixing chamber from respective sources by a vacuum. The mixture is sonicated at precise vibrational frequencies to control the physical properties of the final blended content. A piston-like device is used to remove the blended content from the mixing chamber.