Blood Purification Apparatus Pump Control for Needle Detection
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Solution Overview
Problem
The existing blood purification apparatus lacks strict monitoring during the transition from the returning step to the draining step, where the blood pump may be accidentally activated with a venous puncture needle still inserted, leading to a lack of notification if the arterial or venous puncture needle is stuck in the patient.
Innovation Solution
A blood purification apparatus with a control device that establishes a restricted state for the blood pump when transitioning from a connected step to an unconnected step, operating at a lower flow rate or stopping the pump for a predetermined period to ensure notification if the arterial or venous puncture needle is still inserted, thereby preventing accidental activation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the blood pump is activated in an unconnected step without strict monitoring, then the operation is simpler and faster, but the risk of accidental activation with puncture needles stuck increases
Solution Approach 1:
The control device performs preliminary detection of puncture needle presence before allowing blood pump activation in unconnected steps. This preliminary action prevents accidental activation by checking the operational state of arterial and venous puncture needles beforehand, thereby maintaining reliability without significantly complicating the overall operation.
Solution Approach 2:
The system implements feedback monitoring where the control device continuously detects the state of puncture needles and provides real-time information to prevent inappropriate blood pump activation. This feedback mechanism ensures that the blood pump is only activated when safety conditions are met, balancing ease of operation with reliability.
2Reliability
If strict monitoring is implemented for blood pump activation in unconnected steps, then the safety and reliability improve, but the device complexity and operational steps increase
Solution Approach 1:
The control device utilizes existing multi-functional components (microprocessor, detection circuits, control algorithms) to perform both standard blood pump control and the additional safety monitoring function for puncture needle detection. This approach improves reliability without proportionally increasing device complexity, as the same control hardware serves multiple purposes.
Solution Approach 2:
The system performs self-monitoring and self-protection by automatically detecting puncture needle states and preventing unsafe operations without requiring external intervention. This self-service capability enhances reliability while minimizing the need for additional complex external monitoring systems.
3Productivity
If the blood pump operates at normal flow rate immediately in unconnected steps, then the productivity is higher, but the risk of harm to patient increases if puncture needles are stuck
Solution Approach 1:
The control device performs preliminary detection of puncture needle presence before allowing blood pump activation at normal flow rate. This preliminary safety check ensures that the blood pump only operates at full productivity when it is safe to do so, preventing harmful effects while maintaining high productivity during safe operations.
Solution Approach 2:
The blood pump operates dynamically with adjustable flow rates based on real-time safety conditions. When puncture needles are detected as stuck, the system automatically reduces or stops the flow rate to prevent harm. When safety is confirmed, the pump operates at normal flow rate for optimal productivity. This dynamic adjustment balances productivity with safety.
Data Source
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AI summary
To provide a blood purification apparatus with which the fact that an arterial puncture needle or a venous puncture needle is stuck in the patient can be easily notified at the activation of a blood pump in an unconnected step. A blood purification apparatus includes a blood circuit 1 capable of extracorporeally circulating blood of a patient, a dialyzer 2 capable of purifying the blood flowing through the blood circuit 1, a blood pump 3 provided to an arterial blood circuit 1a and being capable of delivering liquid when activated, and a control device 10 that executes a connected step in which the blood pump 3 is activated with an arterial puncture needle a and a venous puncture needle b being stuck in the patient and an unconnected step in which the blood pump 3 is activated with neither the arterial puncture needle a nor the venous puncture needle b being stuck in the patient. The control device 10 establishes, in the unconnected step, a restricted state where the behavior of the blood pump 3 at the activation of the blood pump 3 is restricted.