Dialysate Bag Exit Port That Melts to Block Overheated Flow
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Solution Overview
Problem
Dialysate containers are often heated improperly using methods like microwaves, leading to potential thermal injuries due to hot spots and inconsistent heating, despite manufacturer warnings against such practices.
Innovation Solution
A thermal protection system integrated into the dialysate container that prevents or indicates excessive heating by melting, changing color, or using a spring-loaded plunger to block fluid flow when the container reaches a predetermined temperature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If dialysate is heated using a microwave to save time, then the heating speed is improved, but the temperature distribution becomes non-uniform causing hot spots and thermal injuries
Solution Approach 1:
A frangible member is pre-installed in the fluid communication path that is designed to break at a specific temperature threshold. This preliminary preparation ensures that before the dialysate can cause thermal injury from uneven heating, the safety mechanism is already in place to detect and respond to excessive temperatures by blocking fluid flow.
Solution Approach 2:
The frangible member acts as an intermediary safety component between the heating process and the patient. It mediates the temperature control by breaking when a predetermined temperature is exceeded, thereby preventing the transmission of overheated dialysate to the patient without requiring direct monitoring or control systems.
2Ease of operation
If dialysate is heated to appropriate temperature to ensure patient comfort, then patient comfort is improved, but the risk of overheating and thermal injury increases
Solution Approach 1:
The frangible member is designed to counteract the potential harmful effect of overheating before it can occur. By setting the break temperature below the level that causes thermal injury, the system preemptively prevents the harmful action of hot dialysate contacting the patient, while still allowing beneficial warming for comfort.
Solution Approach 2:
The frangible member is a single-use, disposable safety component that is discarded after one use. This approach provides reliable thermal protection without the complexity of reusable sensors or control systems, ensuring that each new dialysate bag includes a fresh safety mechanism that has not been previously activated or degraded.
3Reliability
If a thermal protection system is added to prevent overheating, then patient safety is improved, but the device complexity increases
Solution Approach 1:
The safety function is extracted as a separate, independent frangible member rather than being integrated into the main dialysate bag structure. This extraction allows the safety mechanism to be a simple, standalone component that can be easily manufactured and incorporated without complicating the overall bag design or requiring complex assembly procedures.
Solution Approach 2:
The complex electronic temperature monitoring and control systems are replaced with a simple mechanical/thermal frangible member that passively responds to temperature through material properties. This substitution eliminates the need for power sources, sensors, controllers, or wiring, dramatically reducing system complexity while maintaining safety functionality.
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
Prevents the use of dialysate containers subjected to unsafe temperatures, ensuring patient safety by preventing fluid flow and providing visual indicators of improper heating.
Implementation Method 1
a frangible member arranged and configured to melt when exposed to a temperature greater than a predetermined temperature
Implementation Method 2
a thermally sensitive dye arranged and configured to change color when exposed to a temperature greater than a predetermined temperature
Data Source
Figure 1
Figure 2
Figure 3A~3B
AI summary
A thermal protection system configured for use with a dialysate container or bag in a dialysis system is disclosed. The thermal protection system being configured so that when the dialysate container is subjected to a temperature greater than a predetermined temperature such as, when the dialysate container is heated within a microwave oven, the thermal protection system is configured to (i) prevent the flow of dialysate from the bag, (ii) indicate that the dialysate container has been subjected to a temperature greater than the predetermined temperature, or (iii) a combination thereof. In one embodiment, the thermal protection system is a circular hollow ring positioned within an exit port of the bag, the ring melting upon reaching the predetermined temperature to block the flow of dialysate. Alternatively, and/or in addition, the thermal protection system may be a thermally sensitive dye configured to change color upon being subjected to the predetermined temperature.