Blood Purification Warmer with Integrated Liquid Temperature Sensor
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Solution Overview
Problem
Existing blood purification devices face issues with correctly controlling the temperature of supply liquids like dialysate or replenishing liquid due to the separate placement of temperature sensors, which can lead to improper attachment and ineffective warming.
Innovation Solution
The blood purification device integrates a warmer with a heater, a heater temperature detection unit, and a temperature sensor for liquid temperature detection, ensuring that the warming circuit is securely attached and the supply liquid is warmed to the correct temperature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a separate temperature sensor is provided for liquid temperature detection, then the warmer can be controlled to achieve set temperature, but the temperature sensor may be forgotten to be attached or not attached properly, causing incorrect temperature control
Solution Approach 1:
The temperature sensor for liquid temperature detection is integrated onto the warmer body itself, merging the detection function with the heating function. This eliminates the need for separate attachment of the temperature sensor and ensures reliable temperature control.
Solution Approach 2:
The warmer performs self-detection of liquid temperature through the integrated temperature sensor, eliminating the need for external attachment of separate sensors. The system serves itself by incorporating the detection capability directly into the heating device.
2Device complexity
If the temperature sensor is provided separately from the warmer, then the warmer structure can be simpler, but the attachment of the warming circuit may be improper leading to temperature adjustment problems
Solution Approach 1:
The temperature sensor is merged with the warmer body, creating an integrated unit that simplifies the overall structure while ensuring proper attachment. The sensor and heater work together as a single assembly, eliminating attachment errors.
Solution Approach 2:
The warmer is divided into functional segments: a heating section with the heater and a detection section with the temperature sensor. This segmentation allows each component to be optimized for its specific function while maintaining an integrated structure that ensures proper operation.
3Productivity
If the heater temperature is increased to warm the supply liquid effectively, then the warming efficiency improves, but protein components in the supply liquid may coagulate
Solution Approach 1:
The temperature sensor provides real-time feedback on the liquid temperature to the control system. This feedback mechanism allows the heater to maintain the liquid temperature within a safe range (below protein coagulation temperature) while still achieving effective warming, preventing protein coagulation.
Solution Approach 2:
The system dynamically adjusts the heater temperature parameter based on the liquid temperature detected by the sensor. By controlling the heater temperature to be higher than the liquid temperature but below the protein coagulation point, the system achieves efficient warming without causing harmful effects.
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 configuration reduces the likelihood of temperature adjustment issues, accurately detects the attachment of the warming circuit, and prevents protein coagulation by controlling the heater temperature based on the supply liquid composition.
Implementation Method 1
a heater (654) provided on a sandwiching-and-holding surface (651a) sandwiching and holding the warming circuit (66)
Implementation Method 2
a temperature sensor (656) for liquid temperature detection being capable of detecting temperature of the supply liquid flowing through the warming circuit (66)
Data Source
AI summary
A blood purification device includes a blood circuit for extracorporeally circulating blood of a patient; a liquid supply circuit for supplying a supply liquid to the blood circuit or to a blood purifier provided on the blood circuit and a warmer provided on the liquid supply circuit to warm the supply liquid. The warmer is configured to sandwich and hold a warming circuit constituting a part of the liquid supply circuit. The warmer includes a heater provided on a sandwiching-and-holding surface sandwiching and holding the warming circuit. The warmer includes a heater temperature detection unit capable of detecting temperature of the heater. The warmer includes a temperature sensor for liquid temperature detection being capable of detecting temperature of the supply liquid flowing through the warming circuit and being provided on the sandwiching-and-holding surface at a position at which the temperature sensor for liquid temperature detection is separated from the heater and, when sandwiching and holding the warming circuit, comes into contact with the warming circuit on the downstream side of a portion warmed by the heater in a direction of sending liquid.