Extracorporeal Blood Circuit Assembly With Coordinated Pump Control
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Solution Overview
Problem
Existing extracorporeal blood circuits with integrated continuous and pulsatile fluid pumps face challenges in ensuring operational reliability and minimizing patient stress while maintaining therapeutic effectiveness, particularly due to unpredictable changes in patient-specific physiological parameters and system states.
Innovation Solution
A control unit regulates the second pulsatile fluid pump based on the operating speed of the first continuous fluid pump, incorporating sensors for real-time feedback, to maintain a safety margin and ensure stable fluid flow dynamics, preventing negative pressure drops and cavitation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a second pulsatile fluid pump is added to generate pulsatile flow, then patient safety and gentleness are improved, but device complexity increases
Solution Approach 1:
The control unit merges the control of both fluid pumps into a single integrated system. The control unit receives signals from sensors and automatically adjusts operating parameters of both the first continuous pump and the second pulsatile pump, coordinating their operations to achieve reliable pulsatile flow while maintaining system manageability through unified control logic.
Solution Approach 2:
The system implements feedback control by connecting sensors throughout the extracorporeal blood circuit to the control unit. The control unit continuously monitors parameters such as blood flow, pressure, and oxygenation levels, and automatically adjusts the operating parameters of the second pulsatile pump based on this feedback to maintain optimal and safe operating conditions.
2Reliability
If pump operation is automated with control unit and sensors, then operational reliability is improved, but device complexity increases
Solution Approach 1:
The control unit is designed to autonomously monitor and adjust pump operations without requiring constant manual intervention. The system performs self-diagnosis and automatic parameter adjustment based on sensor feedback, enabling the extracorporeal blood circuit to maintain optimal operation independently while improving reliability through continuous automated monitoring.
3Stability of the object's composition
If continuous fluid flow is generated by first pump, then stable base flow is achieved, but pulsatile flow characteristics are lost
Solution Approach 1:
The system transitions from a static continuous flow mode to a dynamic pulsatile flow mode by introducing the second pump. The control unit dynamically adjusts the operating parameters of the second pulsatile pump to superimpose physiological pulse waves on the continuous flow generated by the first pump, enabling the system to adapt between stable base flow and pulsatile flow characteristics as needed.
Solution Approach 2:
The second pulsatile pump introduces periodic flow variations to the continuous stream produced by the first pump. The control unit regulates the pulsatile pump to generate rhythmic flow patterns that mimic natural blood circulation, creating a composite flow that maintains the stability of continuous flow while adding the beneficial periodic pulsations for improved patient outcomes.
Data Source
Figure 1~2
AI summary
The invention relates to an arrangement for establishing an extracorporeal blood circuit with a hose system which has an inlet and an outlet which are designed to be applied to a blood circuit of an individual and along which two fluid pumps are arranged, of which a first fluid pump is capable of generating a continuous fluid flow within the hose system and of which a second fluid pump is capable of generating a pulsatile fluid flow, wherein at least one therapeutically effective component is arranged along the hose system between the two fluid pumps. The invention is characterized in that the second fluid pump is connected to a control unit which controls at least one operating parameter of the second fluid pump at least as a function of a predeterminable speed at which the first fluid pump can be operated.