Foam Core Sandwich Splint for X-Ray Imaging and Hygiene
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Solution Overview
Problem
Conventional orthopedic splints are messy, require precise timing for application, can be wasteful due to improper fitting, are uncomfortable, and create a moist environment conducive to bacterial growth, while also being cumbersome and obstructive to X-ray imaging.
Innovation Solution
A composite material construction featuring two layers of thermoformable material bonded with a foam layer, allowing for heat-forming into complex shapes, providing rigidity, and being lightweight, which can be applied with reduced personnel and improved hygiene, and includes instructions for use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional splint materials (plaster or fiberglass) are used, then the splint provides structural support and rigidity, but the material scatters X-rays and obscures imaging views
Solution Approach 1:
The patent employs a composite material structure consisting of an X-ray transparent polymer matrix combined with radiopaque contrast agents or fillers. This composite approach allows the splint to maintain structural strength while enabling clear X-ray imaging, as the polymer matrix does not scatter X-rays like traditional plaster or fiberglass, and the radiopaque components provide necessary visibility without excessive scattering.
2Ease of operation
If conventional splint materials are wetted to activate curing, then the material becomes pliable for application, but the process is messy and requires precise timing before curing begins
Solution Approach 1:
The patent utilizes thermally activated curing rather than water activation. The splint material remains stable at room temperature and only begins curing when exposed to controlled heat sources. This parameter change from chemical (water) to thermal activation provides a longer working window, eliminates the messiness of water application, and allows practitioners to control the curing process timing more precisely through temperature management.
Solution Approach 2:
The splint material is pre-formulated with curing agents and stabilizers that maintain pliability until thermal activation. This preliminary preparation allows the material to be stored and handled without premature curing, then activated on-demand through heating, providing a controlled transition from pliable to rigid state without time pressure.
3Strength
If conventional splints are applied tightly to stabilize injuries, then fracture stabilization is achieved, but tissue death may occur from pressure buildup
Solution Approach 1:
The patent creates a dynamic splint system where the rigid outer shell provides fracture stabilization while the inner foam layer maintains compressibility and adaptability. This dynamic structure allows the splint to exert sufficient stabilizing force while automatically adjusting to pressure changes, preventing excessive pressure buildup that could cause tissue damage. The foam core acts as a pressure-distributing intermediary between the rigid structure and patient's body.
4Stability of the object's composition
If conventional splints are made rigid for support, then structural stability is provided, but the material creates a moist environment conducive to bacterial growth
Solution Approach 1:
The patent incorporates porous or breathable foam material in the inner layers of the splint, adjacent to the patient's skin. This porous structure allows moisture vapor transmission and air circulation, preventing the accumulation of sweat and bodily fluids that would create a bacterial growth environment. The rigid outer shell maintains structural stability while the porous inner layer manages moisture, eliminating the harmful moist environment without compromising structural support.
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 results in a more efficient, comfortable, and hygienic splint application process with reduced material waste, improved imaging capabilities, and enhanced patient comfort by providing a lightweight, rigid, and breathable support.
Implementation Method 1
a foam layer disposed between, and bonded to, the first and second layers of thermoformable material
Implementation Method 2
the first and second layers of thermoformable material are heat formable within a target temperature range and substantially rigid at temperatures below a minimum formable temperature of about 130 degrees Fahrenheit
Data Source
AI summary
A multi-layered composite material suitable for use in orthopedics includes a foam core layer bonded between two layers of thermoformable polymer material. The thermoformable material is heat formable within a target temperature range allowing for rapid heating and application to a patient such as in the form of a splint. While within the target temperature range, the composite material includes a dwell time sufficiently long to enable proper fitment and adjustment, yet not overly long requiring extended periods of holding the composite material in place. The composite material is very light yet extremely rigid and easily conformable to patients.