RF Fluid Warmer Waveguide Uniform Heating
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Solution Overview
Problem
Current methods for warming therapeutic fluids, such as intravenous fluids and peritoneal dialysis dialysate, face issues with non-uniform heating, energy inefficiency, and safety concerns due to the formation of hotspots, particularly with microwave heating, which can lead to adverse clinical effects and disrupt the sterility of the fluid delivery system.
Innovation Solution
A radio frequency fluid warmer system that uses a waveguide with a source of electromagnetic energy to uniformly warm fluids without the need for additional equipment, ensuring continuous sterility and minimizing the risk of contamination, by employing a matched waveguide condition to prevent hotspot formation and maintain efficient energy absorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If microwave heating is used to warm therapeutic fluids, then heating speed is improved, but non-uniform heating and hotspot formation occur causing safety concerns
Solution Approach 1:
The fluid delivery system is segmented into multiple sections, each with its own heating zone. The fluid path is divided into discrete segments that can be heated independently, allowing control over heating distribution and preventing concentration of energy in a single location, thereby avoiding hotspots while maintaining rapid heating.
Solution Approach 2:
Different regions of the fluid delivery system are assigned different heating characteristics. The heating is applied locally at multiple discrete points along the fluid path rather than uniformly across the entire fluid volume, creating a gradient heating pattern that prevents hotspot formation while achieving rapid overall heating.
2Stability of the object's composition
If additional equipment such as cartridges is introduced to address hotspot issues, then heating uniformity is improved, but device complexity and risk of contamination increase
Solution Approach 1:
The heating function is merged directly into the fluid delivery system itself. Multiple heating zones are integrated along the fluid path, combining the heating capability with the existing fluid transport infrastructure, thereby achieving uniform heating without adding separate cartridges or intermediate heating devices that would increase complexity and contamination risk.
Solution Approach 2:
The fluid delivery system is designed to perform multiple functions simultaneously: fluid transport, heating, and distribution. The same system that delivers the fluid also provides the heating function through integrated heating zones, eliminating the need for separate dedicated heating equipment and reducing overall system complexity.
3Use of energy by moving object
If conventional microwave ovens are used to heat fluids, then heating efficiency is improved, but sterility is compromised due to disruption of the closed system
Solution Approach 1:
The heating system is nested within the closed fluid delivery system. The heating zones are positioned inside the sealed fluid pathway, allowing microwave energy to be applied directly to the fluid while maintaining the integrity of the closed system, thereby preserving sterility while achieving efficient heating.
Solution Approach 2:
The closed fluid delivery system itself acts as an intermediary that allows energy transfer while maintaining sterility. The system enables microwave energy to heat the fluid internally without requiring opening the system to external heating sources, thus preserving the sterile barrier while achieving efficient heating.
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 system provides uniform and efficient warming of fluids, avoiding hotspots and maintaining the sterility of the fluid delivery system, making it suitable for emergency and clinical settings where rapid and safe fluid warming is critical.
Implementation Method 1
A radio frequency fluid warmer system that uses a waveguide with a source of electromagnetic energy to uniformly warm fluids
Implementation Method 2
employing a matched waveguide condition to prevent hotspot formation and maintain efficient energy absorption
Data Source
AI summary
The present invention is generally a radio frequency apparatus for warming fluids such as IV fluids. In exemplary embodiments, a uniform warming of fluids is achieved by exposing a fluid-carrying tube to Radio Frequency (RF) energy. The RF energy may be supplied by an RF generator, which is coupled to a waveguide. The waveguide typically includes an inlet into which a fluid tube may be introduced. Inside the waveguide, a pathway may be formed wherein the fluid tube may rest in a predetermined position. In exemplary embodiments, the pathway guides the positioning of the tube along a transmission-line length of the waveguide, in a manner such that the tube gradually approaches an electromagnetic field inside the waveguide and exits at a second terminal end of the waveguide. Having absorbed energy supplied from the RF generator, the fluid inside the tube exits the apparatus warmed to a desired temperature.