Heat-Formable Composite Material for Custom Orthopedic Fitting
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Solution Overview
Problem
Conventional orthopedic products such as casts, splints, and braces are difficult to custom form into complex shapes, leading to discomfort and reduced compliance due to limitations in materials and construction techniques, which fail to provide a snug, supportive fit.
Innovation Solution
A composite material comprising a heat-formable middle polymer layer sandwiched between elastic stretch fabric and foam layers, allowing for customization and shaping at room temperature, with the ability to be reheated for further fitting and providing durability and comfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional casting materials (fiberglass, plaster) are used, then the material can be formed into basic shapes, but the material cannot be easily custom fitted to complex body shapes and provides limited comfort
Solution Approach 1:
The patent utilizes thermoplastic materials that change their physical properties with temperature. When heated, the material becomes soft and pliable, allowing it to be easily molded to complex body shapes. When cooled, it hardens to provide structural support. This temperature-dependent parameter change enables both easy forming and custom fitting capabilities.
Solution Approach 2:
The invention employs composite materials combining thermoplastic polymers with fabric layers and foam insulation. This composite structure provides multiple functions: the thermoplastic layer offers structural rigidity and heat retention, the fabric layers provide comfort and breathability, and the foam insulation maintains uniform temperature distribution during forming.
2Shape
If polycaprolactone material is heated to high temperatures (160°F) for molding, then the material becomes sufficiently malleable, but the heating time is limited and there is risk of burning the patient or practitioner
Solution Approach 1:
The patent incorporates foam insulation layers within the composite structure that act as thermal buffers. These insulation layers slow heat transfer to the patient's skin, extending the safe working temperature window and reducing burn risk while maintaining material malleability during the forming process.
Solution Approach 2:
The thermoplastic materials are formulated to have a controlled glass transition temperature range that allows sufficient working time at elevated temperatures. By carefully selecting polymers with appropriate transition temperatures, the material remains workable long enough for complex shaping while cooling below burn-threshold temperatures before patient contact.
3Adaptability or versatility
If braces are made flexible to allow body part flexing, then the brace accommodates movement, but the brace loses rigidity needed to prevent injury to weakened body parts
Solution Approach 1:
The patent employs thermoplastic materials that exhibit temperature-dependent rigidity. When heated during application, the material is soft and flexible, allowing it to conform to moving body parts. Once cooled and set in the desired position, the material hardens to provide the necessary structural rigidity for injury prevention and support.
Solution Approach 2:
The brace structure is designed to be dynamically adaptive through the thermal properties of the thermoplastic material. The material transitions between soft/compliant and rigid/supportive states based on temperature, enabling the brace to be easily applied and adjusted during warm, flexible states while providing stable, rigid support during use after cooling.
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 the creation of custom-fitted, strong, and supportive orthopedic products that can be easily shaped and reshaped, offering improved comfort and compliance by maintaining a snug fit while providing structural rigidity.
Implementation Method 1
heated to a temperature at which the middle layer is malleable
Implementation Method 2
the middle layer is malleable at temperatures between about 165 degrees Fahrenheit and 200 degrees Fahrenheit
Implementation Method 3
The outer layers (fabric, cushioned insulative or combinations of the two materials) are malleable at ambient, elevated temperatures and maintain the stability of the middle layer when it is malleable
Implementation Method 4
Once the material cools, it forms a rigid and supportive structure
Data Source
AI summary
A composite material 10 for forming custom fitted orthopedic and other products. The composite material is easily formable when heated to temperatures of about two hundred degrees Fahrenheit for a time of at least six to eight minutes and then is rigid at temperatures of about one hundred thirty degrees. The composite material can be sewn and formed in complex shapes when initially heated to about two hundred degrees. Closure attachments 60 can be secured to the composite material as needed on site rather than at the manufacturing facility. The composite material can be custom fitted to a patient in situ.