Fracture Brace Resilient Shell for Swelling Adaptation
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Solution Overview
Problem
Existing fracture braces fail to maintain adequate loading and stability on fractures, particularly Colles' fractures, due to issues with elastic straps stretching and inadequate distribution of pressure, which can lead to deformity and morbidity, and there is a risk of tourniquet-like constriction.
Innovation Solution
A fracture brace utilizing a resilient material attached to a rigid shell with inelastic straps that apply three-point loading, ensuring constant pressure on the fracture site as swelling subsides, with the resilient material re-expanding to maintain pressure and the strap design avoiding direct limb constriction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If elastic straps are used to accommodate swollen limb, then initial comfort and fit are improved, but as swelling subsides the straps sag and fail to maintain adequate fracture loading
Solution Approach 1:
The strap transitions from a static elastic material to a dynamic system where the resilient material progressively returns to its original shape as swelling subsides, automatically maintaining constant fracture loading throughout the treatment period
Solution Approach 2:
The invention changes the material parameter from elastic (which permanently deforms) to resilient (which returns to original shape), fundamentally altering how the strap responds to swelling changes and enabling sustained fracture loading
2Stability of the object's composition
If rigid brace with three-point loading is applied to maintain fracture position, then fracture stability is improved, but there is risk of circumferential limb compression similar to tourniquet effect
Solution Approach 1:
The brace applies pressure locally only at the three fracture loading points through rigid contact areas, while the resilient material and strap design ensure non-contact with the limb elsewhere, eliminating circumferential compression while maintaining fracture stability
Solution Approach 2:
The resilient material acts as an intermediary between the rigid shell and the limb, providing controlled local pressure at fracture sites while preventing direct rigid contact that would cause harmful circumferential compression
3Stability of the object's composition
If Plaster of Paris cast is used to immobilize fracture, then fracture position is maintained, but wrist stiffness persists for several months and functional recovery is delayed
Solution Approach 1:
The brace allows dynamic adjustment of wrist position and maintains fracture stability simultaneously, enabling gradual functional recovery while preserving fracture alignment, unlike the static cast that causes prolonged stiffness
4Ease of operation
If elastic straps are stretched to accommodate swelling, then initial limb comfort is improved, but energy is lost as straps do not return fully to original shape
Solution Approach 1:
The material parameter changes from elastic to resilient, fundamentally altering the energy response - resilient material returns to original shape and releases stored energy to maintain fracture loading, eliminating the energy loss inherent in elastic materials
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 sustained fracture reduction and improved stability, reducing the incidence of deformity and morbidity by maintaining consistent loading and preventing undesirable limb constriction, compared to both Plaster of Paris casts and previous fracture braces.
Implementation Method 1
the resilient material re-expanding to maintain pressure
Implementation Method 2
tightening the strap so that it overlies and compresses the resilient material, thereby causing the fracture brace to exert pressure on the limb
Data Source
Figure 1
Figure 2
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AI summary
A fracture brace for the treatment of limbs with bone fractures has a first portion comprising a rigid shell having at least two load areas for contact with the limb; a second portion comprising at least one load area for contact with the limb; and a strap adapted to encircle the first and second portions. The first portion has a resilient material attached to the radially outer part of the shell, and the strap overlies and compresses the resilient material so that the fracture brace exerts pressure on the limb, so that the resilient material re-expands upon any decrease of swelling in the limb to maintain pressure on the limb. As the fracture swelling subsides, the resilient material reacts by partially returning towards its original shape, so that any slackening of the strap caused by the reduced swelling is taken up by the resilient material.