Flexible Warming Blanket Uniform Watt Density
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Solution Overview
Problem
Conventional forced-air warming systems for surgical patients are costly, noisy, potentially contaminating, bulky, and pose risks due to high temperatures, while electric warming blankets suffer from stiffness and non-uniform heat distribution, leading to inadequate conductive heat transfer and safety concerns.
Innovation Solution
A flexible electric warming blanket with a conductive fabric and bus bars providing uniform watt density, combined with a temperature sensor for safe temperature control, allowing for conformable placement and efficient radiant and convective heat transfer, while preventing overheating and thermal injuries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If forced-air warming systems are used, then patient warming effectiveness is improved, but device complexity and cost increase
Solution Approach 1:
The patent replaces the complex mechanical forced-air system (blower, hoses, air distribution) with a simpler electric heating element system that directly generates heat through resistive heating. This substitution eliminates the need for air movement mechanics while maintaining warming effectiveness through direct conductive and radiant heat transfer from the heating elements embedded in the blanket.
Solution Approach 2:
The patent extracts and eliminates the unnecessary air blowing and distribution components from the warming system. By removing the blower, hoses, and air channel infrastructure, the design achieves patient warming through direct electrical heating elements, significantly reducing device complexity and cost while maintaining therapeutic effectiveness.
2Temperature
If forced-air warming systems are used, then patient warming effectiveness is improved, but noise and contamination risks increase
Solution Approach 1:
The patent replaces the air-based warming mechanism with direct electric heating elements, eliminating the blower and air flow paths that generate noise and potential contamination. The heating elements transfer thermal energy directly through conduction and radiation without moving air, thus eliminating noise generation and eliminating the risk of blowing contaminants into the surgical field.
3Ease of manufacture
If electric warming blankets are used, then cost and safety are improved, but flexibility and heat distribution uniformity worsen
Solution Approach 1:
The patent embeds flexible heating elements directly into the blanket fabric itself, using thin-film or flexible wire elements that conform to the blanket's flexible structure. This integration ensures the heating elements move with the blanket fabric, maintaining flexibility and drape while providing uniform heat distribution across the blanket surface through the distributed element pattern.
Solution Approach 2:
The patent varies the density and configuration of heating elements in different zones of the blanket to optimize heat distribution. By adjusting the local density of heating elements in specific areas, the system compensates for variations in heat loss and patient contact, achieving uniform overall temperature distribution while maintaining blanket flexibility.
4Ease of operation
If heating elements are made flexible, then blanket drape and conformability are improved, but manufacturing precision and heat distribution uniformity worsen
Solution Approach 1:
The patent uses flexible heating elements constructed from thin-film materials or flexible wires that can be integrated into the blanket fabric during manufacturing. These flexible elements maintain their electrical and thermal properties while conforming to the flexible blanket structure, allowing precise placement patterns that ensure uniform heat distribution even as the blanket drapes over patient contours.
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 flexible electric warming blanket ensures safe and efficient heat transfer to patients, reducing the risk of burns and maintaining optimal body temperature without obstructing surgical views or contaminating the environment, while being cost-effective and safer than forced-air systems.
Implementation Method 1
a heating element having a substantially uniform watt density output... the heating element comprising a conductive fabric
Implementation Method 2
optimize a conductive heat transfer to the patient... when the blanket is in contact with a body
Implementation Method 3
those portions not in contact with the body will be operating at a higher temperature because heat is not being drawn off those portions as efficiently... radiant and convective heat transfer
Implementation Method 4
radiant and convective heat transfer... heat is not being drawn off those portions as efficiently
Data Source
AI summary
An electric heating blanket system includes a flexible sheet-like heating element having a substantially uniform watt density output across a surface area thereof, when the heating element is electrically powered. A temperature sensor is coupled to the heating element at a location where the heating element will be in conductive contact with a body when the blanket is draped over the body. The system further includes a temperature controller coupled to the temperature sensor, and an electric power source coupled to the heating element and to the temperature controller, the power source being controlled to provide the watt density output for the heating element according to a temperature sensed by the sensor.