Hinge Knee Trial Assembly System Instrumentation
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Solution Overview
Problem
Current instruments for hinge knee prosthesis implantation in revision and oncology procedures are complex, costly, and require numerous instruments, leading to increased manufacturing, storage, and sterilization expenses.
Innovation Solution
A hinge knee trial assembly system comprising a tibial trial assembly and a femoral trial assembly, which includes an intercondylar axle for assessing joint kinematics and allowing adjustable positioning to maintain a natural joint line, thereby reducing the need for multiple instruments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If multiple separate instruments are used for hinge knee prosthesis implantation, then the procedure can be performed with traditional methods, but the manufacturing, storage, and sterilization costs increase significantly
Solution Approach 1:
The patent combines multiple separate surgical instruments into a single integrated hinge knee trial assembly system. The femoral trial component, tibial trial component, and axle assembly are integrated into one unified instrument that performs multiple functions (assessing joint kinematics, determining joint line position, evaluating ligament balance) that previously required multiple separate instruments, thereby reducing manufacturing, storage, and sterilization costs while maintaining procedural capability
Solution Approach 2:
The integrated hinge knee trial assembly is designed as a universal instrument that can perform multiple surgical assessment functions simultaneously. The system can assess joint kinematics, determine joint line position, evaluate ligament balance, and guide resection planning all with one instrument set, eliminating the need for multiple specialized instruments and reducing overall system complexity and cost
2Adaptability or versatility
If numerous instruments are provided in sets for hinge knee procedures, then complete surgical functionality is available, but storage, cleaning, packaging, and shipping demands increase
Solution Approach 1:
The patent merges numerous separate surgical instruments into a single integrated hinge knee trial assembly system that provides complete surgical functionality. By combining the femoral trial component, tibial trial component, axle assembly, and various assessment tools into one unified instrument set, the system maintains full adaptability for hinge knee procedures while dramatically reducing the quantity of instruments that need to be stored, cleaned, packaged, and shipped
Solution Approach 2:
The integrated trial assembly serves as a universal instrument that can perform multiple surgical functions including joint kinematics assessment, joint line positioning, ligament balance evaluation, and resection guidance. This multi-functionality ensures complete surgical versatility is maintained while reducing the overall number of instruments from numerous separate pieces to a single coordinated system
3Manufacturing precision
If iterative assembly and disassembly of hinge trial is performed, then joint line position can be adjusted, but the process becomes time consuming and increases infection risk
Solution Approach 1:
The integrated hinge knee trial assembly is designed with pre-configured components and adjustment mechanisms that allow joint line position to be determined and locked in a single setup process. The system includes pre-marked reference points, pre-aligned components, and quick-adjustment features that eliminate the need for repeated assembly and disassembly, allowing surgeons to achieve precise joint line positioning in one action and reduce procedure time and infection risk
4Measurement precision
If axle insertion through bearing plate is required for hinge trial assembly, then proper kinematic assessment can be performed, but the assembly process becomes complex and time consuming
Solution Approach 1:
The axle assembly is pre-configured with alignment features and guide structures that ensure proper insertion through the bearing plate without requiring complex assembly procedures. The system includes pre-positioned reference marks and self-aligning components that guide the axle into the correct position automatically, maintaining precise kinematic assessment capability while simplifying the assembly process to a single straightforward insertion action
Data Source
AI summary
A hinge knee system includes a tibial assembly having a baseplate component and an axle component. The baseplate component has an opening that extends therein from a proximal end toward a distal end thereof. The axle component has a shaft portion receivable within the opening of the baseplate component and an axle connected to the shaft portion that extends in a direction transverse to a longitudinal axis of the shaft portion. The system also includes a femoral assembly that includes a distal femoral component. The distal femoral component includes condylar portions and an intercondylar portion disposed between the condylar portions. The intercondylar portion includes a bearing surface that defines a recess configured to rotatably receive the axle for articulation therewith.