Orthopedic Hinge Linkage for Knee Joint Motion Control
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Solution Overview
Problem
Conventional knee brace hinges fail to accurately simulate the complex movements of the knee joint and control its range of motion effectively, leading to inadequate rehabilitation and increased risk of re-injury, particularly due to their bulkiness and lack of structural integrity.
Innovation Solution
A hinge design featuring a streamlined, low-profile construction with a cover plate that serves as a single linkage, reducing thickness and protecting internal components, along with adjustable rotation stops and condyle plates for enhanced support and stability, allowing for precise control of knee joint flexion and extension.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional hinges are used to support knee joints, then joint movement control is provided, but the hinge becomes bulky and lacks structural integrity
Solution Approach 1:
The hinge is divided into multiple functional components: a housing, a pivot assembly with rotating elements, and a linkage mechanism. This segmentation allows each component to be optimized for its specific function while contributing to overall strength without requiring excessive bulk.
Solution Approach 2:
The hinge utilizes composite construction combining rigid materials for structural components (housing, linkage) with softer materials for friction surfaces and adjustment mechanisms. This composite approach provides high structural integrity where needed while maintaining a compact form factor.
2Measurement precision
If conventional hinges are used, then some joint movement control is achieved, but precise simulation of knee joint movement is not provided
Solution Approach 1:
The hinge incorporates a dynamic linkage mechanism that adapts its geometry during movement to simulate the natural arc of knee joint rotation. The linkage includes adjustable elements that can be configured to match different knee movement patterns, providing precise simulation without requiring overly complex mechanisms.
Solution Approach 2:
The hinge features adjustable parameters including rotation stops that can be positioned at different angles, and linkage lengths that can be modified. These parameter changes allow the hinge to be tuned to match the specific movement characteristics of different knee joints, achieving precise simulation while maintaining relatively simple construction.
3Ease of operation
If conventional hinges are used, then basic support is provided, but adequate control of knee joint range of motion is not achieved
Solution Approach 1:
The hinge includes pre-configured rotation stops and adjustable limits that are set before use to define the acceptable range of motion. This preliminary configuration ensures that the knee joint cannot exceed safe movement boundaries, providing reliable rehabilitation control while allowing easy adjustment of the range limits.
Solution Approach 2:
The hinge provides mechanical feedback through its linkage and rotation stop mechanisms, giving the user tactile information about the boundaries of safe movement. This feedback system enhances ease of operation by allowing users to understand and control their range of motion while maintaining reliable protection against excessive movement.
4Volume of moving object
If the hinge is made more compact, then profile is reduced, but protection of internal components may be compromised
Solution Approach 1:
The hinge employs a nested arrangement where the pivot assembly and linkage components are housed within a compact housing structure. This nesting protects internal components from external damage while maintaining a thin overall profile. The housing acts as a protective shell that encloses the delicate moving parts.
Solution Approach 2:
The hinge utilizes a thin-walled but reinforced housing structure that provides protection for internal components while minimizing thickness. The housing incorporates strategic reinforcement elements and material selection that provide adequate protection against impact and damage without requiring excessive bulk.
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 design provides greater support and control over knee joint movement, reducing the risk of re-injury and improving rehabilitation outcomes by mimicking natural knee joint mechanics while being more compact and durable.
Implementation Method 1
The cover plate is pivotally connected at first location point to the upper hinge component and at a second location point to the lower hinge component... The connection of the cover plate at the first location point rotates around the third location point and the connection of the cover plate at the second location point rotates around the fourth location point
Data Source
AI summary
A hinge includes an upper hinge component and a lower hinge component. A cover plate is pivotally connected at first location point to the upper hinge component and at a second location point to the lower hinge component. First and second plates are pivotally connected at a third location point to the upper hinge component and at a fourth location point to the lower hinge component. The first plate is positioned between the cover plate and the upper and lower hinge components. The upper and lower hinge components are positioned between the first and second plates. The cover plate is mounted on an outer side of the hinge and the connection of the cover plate at the first location point rotates around the third location point and the connection of the cover plate at the second location point rotates around the fourth location point.