Integrated Thermoformable Splint with Oxygen-Activated Heater
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Solution Overview
Problem
Existing thermoformable splint structures require separate heating bags for exothermic reactions, which are inconvenient and lack integrated solutions combining thermoplastic materials with oxygen-activated heaters.
Innovation Solution
An integrated portable thermoformable splint structure that includes a heater sheet, wicking layer, and air diffuser layer, where the heater sheet reacts exothermically with oxygen, and is secured to the thermoplastic material within an outer housing that allows controlled oxygen ingress for heat generation, enabling direct application on a patient's body.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a separate heating bag is used for exothermic reactions, then the thermoplastic material can be heated effectively, but the device complexity and inconvenience increase due to requiring separate components
Solution Approach 1:
The patent combines the heater and thermoplastic material into a single integrated structure where the heater is constructed directly within the splint body. The heater comprises a metal powder layer, electrolyte layer, and porous polymer layer integrated with the thermoplastic material, eliminating the need for separate heating bags and reducing device complexity while maintaining effective heating capability.
2Temperature
If oxygen is allowed to react with the heater immediately, then heat generation begins, but uncontrolled heat distribution may cause safety issues
Solution Approach 1:
The patent incorporates an oxygen-impermeable barrier layer that prevents oxygen from reaching the heater during packaging and storage. The barrier layer is designed to be broken or penetrated at a predetermined time or location, allowing controlled oxygen ingress and initiating heat generation only when needed. This preliminary protective action ensures safe storage while enabling controlled heat distribution during use.
3Shape
If the thermoplastic material is heated to become malleable, then it can be formed to the patient's body, but the material loses its rigid support structure during forming
Solution Approach 1:
The patent utilizes the dynamic property of thermoplastic materials that transition between rigid and malleable states based on temperature. The integrated heater heats the thermoplastic material to its glass transition temperature, causing it to become malleable for conforming to the patient's body. After forming, the material naturally cools and returns to its rigid state, providing the necessary structural support. This dynamic state change allows the material to temporarily lose rigidity during forming while regaining it for 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
This solution provides a convenient, integrated system for forming a rigid splint without separate heating bags, ensuring effective heat distribution and safety by using a metal-based substrate that reacts with oxygen to heat the thermoplastic material, allowing for efficient shaping and subsequent return to a rigid state.
Implementation Method 1
the heater sheet comprises a metal-based substrate that exothermically reacts with and upon exposure to oxygen
Implementation Method 2
the wicking layer incorporates and distributes an electrolyte for operative use with the heater sheet
Data Source
Figure 1~2
Figure 3~5
AI summary
An integrated thermoformable splint and heater and method for manufacturing same includes a thermoplastic material and an oxygen activated heater operatively associated with the thermoplastic material. The integrated thermoformable splint and heater are sealed within an oxygen impermeable housing. Oxygen is allowed to activate the heater either by removing the assembly from the sealed housing, or, by displacement of a removable seal that will allow oxygen to penetrate a porous region in the housing, and, in turn, come into contact with the heater.