Motor Current Pressure Detection in Dialysis Circuits
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Solution Overview
Problem
Existing dialysis systems face challenges in accurately detecting hemoconcentration and pressure increases without invasive pressure sensors, which can lead to blood clotting and increased viscosity issues, posing risks of blood loss and electrical safety concerns.
Innovation Solution
Measuring motor current and blood flow to calculate pressure or pressure differences, eliminating the need for invasive pressure sensors by using the relationship IM=a+b·Qb+c·Qb·Δp to determine pressure values and regulate blood flow accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If invasive pressure sensors are used to detect pressure changes and hemoconcentration, then measurement precision is improved, but device complexity and risk of blood clotting increase
Solution Approach 1:
The patent replaces mechanical pressure sensors with an electrical measurement system. It uses the electric motor's current consumption to infer pressure changes and hemoconcentration. The motor current is measured and processed to detect pressure increases, eliminating the need for direct mechanical contact with blood while maintaining detection capability.
Solution Approach 2:
The patent introduces the motor current as an intermediary parameter to indirectly measure pressure changes. Instead of directly measuring pressure with sensors in contact with blood, the system measures the electrical current drawn by the motor, which changes in response to pressure variations and blood viscosity changes, serving as a safe intermediary indicator.
2Reliability
If invasive pressure sensors are installed in the blood circuit, then pressure monitoring capability is improved, but reliability decreases due to clotting risks
Solution Approach 1:
The patent eliminates mechanical pressure sensors from the blood circuit by using electrical current measurement. The motor current measurement system does not require physical contact with blood, thereby removing the source of clotting problems associated with foreign objects in the blood path while maintaining the ability to detect pressure-related changes.
Solution Approach 2:
The patent utilizes the motor's own operational characteristics (current consumption) to provide pressure monitoring functionality. The motor serves dual purposes: pumping blood and providing measurement data for pressure detection, eliminating the need for separate sensing components that could cause clotting.
3Device complexity
If motor current and blood flow are measured to calculate pressure, then device complexity is reduced, but measurement precision may be affected
Solution Approach 1:
The patent implements a feedback-based measurement approach where motor current and blood flow data are continuously monitored and processed. The system uses the relationship between motor current, blood flow rate, and pressure to calculate pressure values, with the ability to adjust and refine measurements based on ongoing operational data, maintaining accuracy without complex hardware.
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 method allows for reliable detection of hemoconcentration and pressure changes without invasive sensors, preventing blood clotting and viscosity increases, thus ensuring safer and more efficient dialysis processes.
Implementation Method 1
at least one blood pump which is driven by at least one electric motor
Implementation Method 2
The blood is conveyed by the blood pump 4 which is typically a peristaltic pump
Implementation Method 3
blood components such as middle molecules, water, etc. move via the semipermeable membrane of the dialyzer 5 onto the side of the dialysis fluid
Implementation Method 4
The effectiveness of convective dialysis procedures (H(D)F pre/post/mixed)
Implementation Method 5
a substituate pump 12 by means of which the substituate is conducted into the purified blood
Data Source
AI summary
The present invention relates to a method of determining the pressure or of a parameter correlated with the pressure in an extracorporeal circuit of a blood treatment apparatus, in particular of a dialyzer, wherein at least one blood pump which is driven by at least one motor is located in the blood circuit, wherein the motor current of the named motor and the blood flow or a parameter correlated therewith is measured for determining the pressure or the parameter correlated therewith and wherein the pressure p or the parameter correlated therewith is calculated from the measured values.