Metallic IV Fluid Conduit Heating for Uniform Temperature Control
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Solution Overview
Problem
Existing devices for heating intravenous fluids often result in non-uniform heating, leading to localized hotspots that can degrade blood, and are bulky, impractical for field use, with conductive polymer systems being energetically inefficient and posing safety risks.
Innovation Solution
A metallic conduit with a temperature sensing arrangement and controller to generate electrical current within the conduit wall for gradual and controlled heating, ensuring uniform temperature regulation, using stainless steel with high thermal conductivity and low operating voltages, and a portable design for compactness and safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If heating elements are embedded in the walls of the conduit, then heating capability is improved, but localized hotspots and non-uniform heating occur
Solution Approach 1:
The heating element is divided into multiple discrete heating zones along the conduit length. Each zone can be independently controlled to provide distributed heating throughout the fluid path, preventing concentration of heat in a single location and thereby eliminating localized hotspots while maintaining effective heating capability.
Solution Approach 2:
Different sections of the conduit wall are equipped with heating elements having different electrical resistance characteristics. By varying the resistance along the conduit length, the heat generation is distributed non-uniformly in a controlled manner to compensate for heat loss patterns, ensuring uniform temperature distribution of the flowing fluid without creating hotspots.
2Reliability
If a bulk warmer is maintained at proper temperature for emergency use, then readiness for emergency use is improved, but device size and weight increase
Solution Approach 1:
The device incorporates automatic temperature maintenance through a feedback control system that monitors fluid temperature and adjusts heating element power consumption accordingly. This self-regulating capability allows the device to maintain readiness for emergency use without requiring excessive thermal mass or continuous high power consumption, thereby reducing overall device weight while ensuring reliability.
Solution Approach 2:
The heating system is pre-configured with control circuits and temperature sensors that enable immediate operation upon activation. The device can be quickly brought to operational temperature from ambient conditions due to the pre-positioned heating elements and control logic, providing emergency readiness without requiring a bulky pre-heated reservoir or extended warm-up infrastructure.
3Temperature
If heating wires are wound spirally around the tubing, then heating coverage is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The heating element is integrated directly into the conduit wall structure during the tubing manufacturing process. The heating wire is embedded within the wall material in a linear or spiral configuration that is formed as a single integrated component, providing comprehensive heating coverage while eliminating separate assembly steps and reducing manufacturing complexity compared to post-assembly approaches.
Solution Approach 2:
The heating element geometry is optimized by adjusting the spiral winding parameters (pitch, diameter, tightness) during manufacturing to achieve uniform heat distribution. By controlling these geometric parameters, comprehensive heating coverage is obtained with a simple spiral configuration that can be manufactured using standard extrusion or winding techniques, avoiding complex multi-component assemblies.
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 provides safe, compact, and efficient heating of intravenous fluids to a precise temperature, preventing hypothermia and maintaining the integrity of blood, while being suitable for various environmental conditions and emergency situations.
Implementation Method 1
a controller deployed for generating electrical current flowing within at least one length of the wall of the conduit, thereby generating heat within the wall so as to heat the flow of liquid
Implementation Method 2
the conduit is formed from a metallic material having a thermal conductivity of at least about 5 W/(m.K)
Data Source
AI summary
A device (100) for heating a flow of liquid from an initial temperature to a desired temperature for intravenous delivery includes an elongated conduit (120) formed from metallic material having an inlet (102) for receiving the flow of liquid at the initial temperature and an outlet (104) for delivering the flow of liquid at the desired temperature. A temperature sensing arrangement (160. 162, 224) is deployed to generate an output indicating the temperature of the liquid at a number of locations along the conduit (120). A controller (140) generates electrical current flowing within at least one length of the wall of the conduit, thereby generating heat within the wall so as to heat the flow of liquid to reach the desired temperature at the outlet.