Blood Pump Suction Pressure Error Reduction
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Solution Overview
Problem
In blood purification apparatuses, changes in suction pressure due to substitution fluids can lead to errors in the amount of discharge from the blood pump, affecting the efficiency of blood purification treatments.
Innovation Solution
A blood purification apparatus with a pressure-detecting device and a control device that adjusts the driving speed of the blood pump based on detected suction pressure, and controls the flow rate of substitution fluids to maintain a predetermined suction pressure, thereby reducing discharge errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If substitution fluid is supplied through the substitution line, then the blood purification apparatus can perform substitution treatment, but the suction pressure of the blood pump changes causing error in the amount of discharge
Solution Approach 1:
The control device receives signals from the pressure-detecting device that monitors suction pressure changes in real-time. Based on this feedback, the control device adjusts the driving speed of the blood pump to compensate for pressure variations caused by substitution fluid supply, thereby maintaining accurate discharge volume despite the presence of the substitution line
Solution Approach 2:
The system dynamically changes the operating parameters of the blood pump (driving speed) in response to detected suction pressure changes. When substitution fluid is supplied and pressure changes are detected, the control device modifies the pump speed parameter to maintain constant discharge volume, thus resolving the contradiction between substitution capability and measurement precision
2Productivity
If the suction pressure of the blood pump changes, then the blood pump can adapt to different flow conditions, but the amount of discharge from the blood pump has an error
Solution Approach 1:
The pressure-detecting device continuously monitors suction pressure and provides feedback to the control device. The control device uses this feedback to adjust the blood pump driving speed, ensuring that discharge volume remains accurate even when suction pressure varies due to different flow conditions or substitution fluid supply
Solution Approach 2:
The system transitions from a static operating mode to a dynamic adaptive mode where the blood pump speed is continuously adjusted based on real-time pressure detection. This dynamic adjustment allows the system to maintain accurate discharge volume while adapting to varying suction pressure conditions, resolving the contradiction between productivity and measurement precision
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 apparatus effectively reduces errors in blood pump discharge caused by suction pressure changes, ensuring consistent and efficient blood purification by adjusting the blood pump speed and substitution fluid flow rate.
Implementation Method 1
a pressure-detecting device attached to a predetermined position of the arterial blood circuit that is on the distal side with respect to the position where the blood pump is provided, the pressure-detecting device being capable of detecting the suction pressure of the blood pump
Implementation Method 2
a blood pump allowing liquid in a squeezable tube connected to the arterial blood circuit to flow by squeezing the squeezable tube in the lengthwise direction while compressing the squeezable tube in the radial direction
Data Source
AI summary
A blood purification apparatus in which the error in the amount of discharge from a blood pump that is caused by the change in the suction pressure of the blood pump is reduced. A blood purification apparatus includes a blood circuit through which blood of a patient is extracorporeally circulated; a dialyzer connected to proximal ends of an arterial blood circuit and a venous blood circuit and that purifies the blood extracorporeally circulating through the blood circuit; a squeezable tube connected to the arterial blood circuit; a blood pump allowing liquid in the squeezable tube to flow by squeezing the squeezable tube in a lengthwise direction while compressing the squeezable tube in a radial direction; and a pressure-detecting device attached to a predetermined position of the arterial blood circuit that is nearer to a distal end than a position where the blood pump is provided, the pressure-detecting device being capable of detecting a suction pressure of the blood pump.