Orthopedic Hinge With Center Link For Knee Joint Simulation
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Solution Overview
Problem
Conventional knee brace hinges fail to accurately simulate the complex movements of the knee joint and adequately control the range of flexion and extension, leading to inadequate rehabilitation and increased risk of re-injury, particularly due to their lack of adjustability and structural integrity.
Innovation Solution
A hinge design featuring upper and lower components, a center link, and rotation stops that allow for symmetrical loading and adjustable limits on flexion and extension, with a condyle plate for additional support, enabling precise simulation of knee joint movements and easy adjustment to accommodate individual needs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional hinges are used in knee braces, then the device structure is simple, but the hinge fails to accurately simulate the complex movements of the knee joint and adequately control the range of flexion and extension
Solution Approach 1:
The hinge is divided into multiple functional components: upper hinge component, lower hinge component, center link, rotation stops, and condyle plate. Each component performs a specific function in simulating knee joint movement, allowing the complex simulation task to be distributed across segmented parts rather than requiring a monolithic complex structure.
Solution Approach 2:
The hinge employs dynamic elements including the center link that moves relative to the hinge components, and rotation stops that can be adjusted to different positions. The design allows the axis of rotation to shift during flexion and extension, mimicking the natural dynamic behavior of the knee joint rather than relying on a fixed axis.
2Adaptability or versatility
If conventional hinges are used, then the manufacturing process is simple, but the hinge lacks adjustability to accommodate individual user needs and rehabilitation progress
Solution Approach 1:
The rotation stops are designed to be adjustable to different angular positions, allowing the hinge to adapt to individual user needs and changing rehabilitation requirements. This dynamic adjustability feature enables the same hinge structure to serve multiple patients with different mobility constraints without requiring custom manufacturing for each case.
Solution Approach 2:
The hinge design incorporates multiple functional elements (center link, rotation stops, condyle plate) that can be configured in different ways to address various rehabilitation scenarios. The universal design allows a single hinge model to provide customized range of motion control for different users through adjustment of the rotation stops rather than requiring multiple specialized hinge designs.
3Strength
If conventional hinges are used, then the device is lighter, but the hinge lacks sufficient structural integrity to prevent re-injury during physical sport endeavors
Solution Approach 1:
The hinge combines multiple support and control functions into a single integrated structure. The center link, rotation stops, and condyle plate work together as a unified system that provides both mechanical strength for injury prevention and the necessary range of motion control, eliminating the need for separate heavy reinforcement components that would be required if these functions were implemented separately.
Solution Approach 2:
The hinge components are designed to utilize material properties and structural configurations that maximize strength-to-weight ratio. The combination of rigid elements (hinge components, center link) with controlled motion elements (rotation stops) creates a composite structural system that provides sufficient structural integrity for injury prevention while maintaining acceptable weight for athletic application.
4Manufacturing precision
If adjustable rotation stops are implemented, then the hinge can control the range of knee joint motion, but the hinge becomes more complex and harder to manufacture
Solution Approach 1:
The rotation control function is segmented into discrete rotation stop components that can be manufactured independently and then assembled into the hinge. This segmentation allows for precise manufacturing of each stop component using standard machining processes, and the modular nature simplifies quality control and assembly compared to manufacturing a fully integrated precision control system.
Data Source
AI summary
A hinge for an orthopedic device includes an upper hinge component, a lower hinge component, a first plate pivotally connected at a first location point to the upper hinge component and connected at a second location point to the lower hinge component, and a second plate pivotally connected at the first location point to the upper hinge component and at the second location point to the lower hinge component. A first rotation stop is connected at a third location point to the first and second plates. A center link is pivotally attached at a fourth location point to the upper hinge component and at a fifth location point to the lower hinge component. The center link has a first stop surface arranged to directly abut the first rotation stop. The hinge components and the center link are arranged between the first plate and the second plate.