Ratcheting Orthopedic Brace Tensioning Mechanism
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Solution Overview
Problem
Existing orthopedic braces, particularly knee braces, face challenges in providing easily adjustable and quickly releasable tensioning systems for straps, which is crucial for proper fit and comfort, as users' anatomical dimensions vary widely, and current solutions do not adequately address the need for rapid adjustment and secure fastening.
Innovation Solution
A strap adjustment system incorporating a ratcheting tensioning mechanism with a knob-activated cinching system, featuring a ratchet wheel and ratchet arms for tightening and a quick release mechanism with a floating arm and bullnose for easy strap extension and retraction, along with a spring-loaded retraction system to prevent entanglement and provide angular orientation relief.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If adjustable straps are used to accommodate varying anatomical dimensions, then adaptability is improved, but device complexity increases due to multiple adjustment mechanisms
Solution Approach 1:
The ratcheting tensioning mechanism serves multiple functions: it provides adjustable tensioning, maintains secure fastening, and enables quick release. This multi-functionality reduces the need for separate adjustment mechanisms, thereby managing device complexity while improving adaptability to varying anatomical dimensions.
Solution Approach 2:
The floating arm mechanism dynamically transitions between engaged and disengaged states, allowing the strap to be quickly adjusted or released. This dynamic design enables rapid adaptation to different fit requirements without requiring complex manual adjustment procedures.
2Ease of operation
If quick release mechanism is implemented, then ease of operation is improved, but reliability may worsen due to potential accidental disengagement
Solution Approach 1:
The ratchet teeth are designed to engage with the floating arm in a manner that prevents accidental disengagement. The geometric configuration of the ratchet teeth and floating arm creates a mechanical interlock that requires deliberate action to disengage, thereby preventing premature release while maintaining ease of intentional operation.
3Reliability
If ratcheting mechanism is used for secure fastening, then reliability is improved, but device complexity increases due to additional components
Solution Approach 1:
The ratcheting mechanism is integrated with the floating arm and cinching system into a single unified assembly. This merging of components achieves secure fastening through the ratchet teeth engagement while minimizing the number of separate parts, thereby maintaining reliability without proportionally increasing device complexity.
4Ease of operation
If spring loaded retraction is added, then ease of operation is improved, but device complexity and loss of substance worsen
Solution Approach 1:
The spring-loaded retraction mechanism automatically rewinds and retracts the strap after it has been extended and tensioned. This self-service function eliminates the need for manual retraction operations, significantly improving ease of operation. The spring mechanism is integrated into the existing ratcheting assembly, minimizing additional complexity while providing automatic strap management.
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 rapid and secure adjustment of strap tension, allowing for a customizable fit and easy removal of the brace, while preventing strap warping and ensuring comfortable wear by maintaining tension without manual effort.
Implementation Method 1
a spring-loaded retraction system to prevent entanglement and provide angular orientation relief
Data Source
Figure 1
Figure 2A
Figure 2B
AI summary
A cinching system for a strap comprising a knob 50 rotatable in a first direction about an axis of rotation; an engagement element interconnected to the knob for rotation by the knob in the first direction; a gear assembly 62 rotatable by the engagement element; a shaft 60 engaging the gear assembly for rotation, said shaft oriented orthogonal to the axis of rotation of the knob; and a strap 38 extendible from the shaft and retractable on the shaft upon rotation of the shaft by the gear assembly.