Segmented Thermal Blanket for Limb Warming
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Solution Overview
Problem
Presently-designed thermal blankets are not well-suited for providing preoperative comfort warming, particularly for supine patients, as they focus on warming the anterior thoracic and abdominal regions with low density of thermo-receptors, rather than effectively warming the limbs which are crucial for maintaining core body temperature during surgery.
Innovation Solution
A thermal blanket design featuring an inactive surface region for the anterior or posterior thoracic and abdominal area and active regions that circulate warmed air to the limbs, with an inflatable pneumatic structure and separate manifolds to distribute air effectively to the shoulders, arms, and lower legs, enhancing prewarming and comfort warming capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If thermal blankets focus on warming the anterior thoracic and abdominal regions, then the design is simple and follows conventional patterns, but the warming effectiveness is reduced because these regions have low density of thermo-receptors
Solution Approach 1:
The thermal blanket is segmented into distinct functional zones: active regions with higher permeability for circulatory access positioned over limbs, and inactive regions with lower permeability for thermal insulation positioned over the thoracic and abdominal core. This segmentation allows each region to perform its specific function optimally, resolving the contradiction between simple conventional design and effective warming targeting.
Solution Approach 2:
Different regions of the blanket are assigned different permeability qualities to match the physiological needs of different body parts. The active regions have higher permeability to facilitate blood flow and warming of extremities, while inactive regions have lower permeability to maintain core temperature. This local differentiation of properties enables the blanket to effectively warm regions with low thermo-receptor density by improving peripheral circulation.
2Device complexity
If thermal blankets use uniform air circulation across the entire surface, then the structure is simple, but the warming distribution is inefficient for supine patients who need targeted limb warming
Solution Approach 1:
The blanket structure is segmented into active and inactive regions that are differentially connected to the air circulation system. Active regions are positioned to target limbs and have higher permeability for effective warming, while inactive regions over the core are insulated. This segmentation enables targeted warming of supine patients without requiring complex repositioning or additional components.
Solution Approach 2:
The blanket incorporates adjustable permeability characteristics that can be dynamically controlled to optimize air distribution. The active regions allow greater air flow for limb warming while inactive regions restrict flow for core insulation, creating a dynamic warming pattern that adapts to the supine patient's physiological needs without increasing structural complexity.
3Ease of operation
If thermal blankets provide comfort warming to the core region, then patient comfort is maintained, but core body temperature drops during surgery because peripheral regions are not adequately warmed
Solution Approach 1:
The blanket divides the body surface into active regions for peripheral warming and inactive regions for core insulation. This segmentation enables simultaneous comfort warming of the core through insulation while actively warming peripheral limbs through enhanced air circulation, thereby preventing core body temperature drops during surgery.
Solution Approach 2:
The active regions are positioned to provide preliminary warming to peripheral limbs before core temperature can drop. By targeting extremities first through differential permeability, the blanket prevents heat redistribution from core to periphery that occurs during surgery, thereby maintaining core body temperature while providing comfort warming.
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 design effectively prevents core body temperature drops by increasing thermal energy in peripheral regions, ensuring patient comfort and maintaining normothermia during surgical procedures.
Implementation Method 1
active regions of the surface adapted to circulate air to limbs of the person
Implementation Method 2
adapted to circulate warmed air to limbs of the person
Implementation Method 3
an inactive surface region adapted to lie against the anterior or posterior surface of a person
Data Source
AI summary
A thermal blanket for warming the limbs includes a surface, an inactive region of the surface adapted to lie against the thoracic and/or abdominal area of a person extending at least from the thighs to the abdomen of the person, active regions of the surface adapted to circulate pressurized air to limbs of the person, and an inflatable pneumatic structure adapted to distribute pressurized air to the active regions. When warmed, pressurized air is introduced into the pneumatic structure, prewarming and/or comfort warming is provided.