Dialysis Absorption Measurement Stabilization
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Solution Overview
Problem
Existing renal replacement therapy devices face challenges in providing reliable and accurate Kt/V value and reduction rate measurements due to varying radiation intensity and detector sensitivity over time, leading to falsified absorption measurements.
Innovation Solution
The device compensates for radiation intensity changes by tracking and adjusting the radiation source's intensity and incorporates temperature control to stabilize the signal, using a control loop and two photodetectors for precise absorption measurements, ensuring consistent radiation and detector sensitivity throughout the treatment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If absorption measurement is performed using a radiation source and detector system during renal replacement treatment, then Kt/V value and reduction rate can be determined, but the radiation intensity of the source and sensitivity of the detector vary over time causing measurement falsification
Solution Approach 1:
The device measures the radiation intensity at the detector position using a reference photodetector that receives radiation without absorption by dialysis fluid. This measured intensity is fed back to a control unit, which adjusts the radiation source intensity to maintain a constant target value, thereby compensating for source aging and detector sensitivity variations
Solution Approach 2:
A reference photodetector is introduced as an intermediary element to measure the actual radiation intensity reaching the detector position. This reference measurement serves as a mediator between the radiation source and the absorption measurement, enabling indirect monitoring and compensation of intensity variations
2Duration of action of moving object
If the radiation source operates over extended periods, then treatment duration is sufficient, but the radiation intensity decreases due to aging
Solution Approach 1:
The control unit continuously monitors the radiation intensity at the detector position and adjusts the radiation source intensity in real-time based on feedback signals, compensating for aging effects and maintaining consistent measurement conditions throughout the treatment duration
Solution Approach 2:
The system dynamically changes the operating parameters of the radiation source, specifically adjusting its intensity output based on measured deviations from the target value, thereby maintaining optimal radiation intensity despite source aging over extended operating periods
3Temperature
If temperature fluctuations occur during treatment, then environmental conditions vary, but the detector sensitivity and radiation source intensity become unstable
Solution Approach 1:
The system compensates for temperature-induced parameter changes by dynamically adjusting the radiation source intensity and detector sensitivity settings based on the measured target value, maintaining stable measurement conditions despite ambient temperature fluctuations
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 approach provides reliable and unbiased Kt/V value and reduction rate measurements by normalizing absorption measurements and stabilizing signal intensity, significantly improving the accuracy and informative value of the results.
Implementation Method 1
The dialysis fluid contains different salts in such a concentration that the waste products, including toxic substances, are carried through the membrane from the patient's blood to the dialysis fluid by diffusion and convection... absorption measurement in the used dialysis fluid
Implementation Method 2
the waste products, including toxic substances, are carried through the membrane from the patient's blood to the dialysis fluid by diffusion and convection
Implementation Method 3
the waste products, including toxic substances, are carried through the membrane from the patient's blood to the dialysis fluid by diffusion and convection
Data Source
Figure 1
Figure 2
AI summary
The apparatus has a measuring device provided within a discharge unit (30) for determining absorption of used dialysis fluid flowing through the discharge unit. The measuring device includes a radiation source (41) for monochromatic electromagnetic radiation, and a detector system (42) detects intensity of the electromagnetic radiation. A compensation unit (50) compensates changes that occur in intensity of the electromagnetic radiation of the radiation source and/or sensitivity of the detector system, and is formed as a temperature regulator. An independent claim is also included for a method for compensating intensity changes of an electromagnetic radiation source.