Flow-Through Heater Insulation Structure for Ungrounded Dialysis Safety
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Solution Overview
Problem
Medical heaters used in dialysis equipment face challenges in ensuring electrical safety, particularly in home settings where proper grounding cannot be guaranteed, necessitating a solution that meets higher electrical safety standards like Type BF and Type CF without relying on device grounding.
Innovation Solution
The design incorporates an insulating body with a heater surrounded by dielectric layers and a protection housing, which provides mechanical and electrical insulation, ensuring safe operation by preventing electrical shock and maintaining temperature stability, while allowing for accurate heat transfer and fluid flow through turbulence-inducing structures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a cartridge heater meeting Type B electrical standards is used, then heating function is provided, but proper grounding cannot be ensured in home dialysis applications
Solution Approach 1:
The patent introduces dielectric layers as intermediary materials between the heater and the dialysate. These dielectric layers act as mediators that provide electrical insulation, allowing the heater to operate safely without requiring grounding. The dielectric material blocks electrical current paths, preventing any potential electrical shock to the patient while still allowing thermal energy transfer to heat the dialysate.
Solution Approach 2:
The heating assembly is segmented into distinct functional layers: a heater element, dielectric layers surrounding it, and a protection housing. This segmentation separates the electrical heating function from the fluid contact function, with the dielectric layers forming an intermediate barrier that eliminates the need for grounding while maintaining both heating efficacy and electrical safety.
2Reliability
If double insulation with floating circuit is implemented to meet Type BF or CF standards, then electrical protection is improved, but device complexity increases
Solution Approach 1:
The patent merges multiple insulation functions into a single integrated dielectric layer structure. Rather than implementing separate grounding mechanisms and multiple independent insulation systems, the dielectric layers simultaneously provide electrical isolation, mechanical support, and thermal coupling functions, simplifying the overall device structure while meeting Type BF or CF electrical safety standards.
Solution Approach 2:
The patent employs composite material construction with dielectric layers that combine electrical insulating properties with thermal conductivity characteristics. This composite approach allows the insulation structure to provide both electrical protection and efficient heat transfer to the dialysate, reducing the need for additional separate components and simplifying the overall device design.
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 effectively enhances electrical safety by reducing leakage currents and ensuring compliance with Type BF and Type CF standards, even in ungrounded environments, thus protecting patients and operators, and maintaining efficient heating performance.
Implementation Method 1
a heater surrounding the insulating material and the insulating body
Implementation Method 2
an insulating body forming a channel therethrough for fluid travel, an insulating material surrounding the insulating body
Data Source
AI summary
An electrical heating device for medical equipment is provided. The heating device includes a body, which may be an insulating body forming a channel therethrough for fluid travel, an insulating material surrounding the body, and a heater surrounding the body and the insulating material. In other forms, the electrical heating device for medical equipment has a conducting body, instead of an insulating body, forming a channel therethrough for fluid travel. A base dielectric layer is disposed on the conducting body, and a heater surrounds the base dielectric layer and the conducting body. A top dielectric layer is disposed on the heater, and a protection housing surrounds the top dielectric layer.