Diaphragm Pump Control Using Hemodynamic Feedback
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Solution Overview
Problem
Existing pump systems for supporting heart activity, such as ventricular assist devices (VADs), struggle to detect physiological events and changes in patients, leading to inadequate adjustment of operating parameters, and lack systems that can control blood flow according to actual hemodynamic parameters while ensuring patient safety and health.
Innovation Solution
A diaphragm fluid pump system with a control unit that uses sensors to detect hemodynamic parameters and adjust operating parameters based on time offsets and hemodynamic sets, allowing non-invasive control of blood flow to match patient needs and physiological conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If pump systems use fixed operating parameters, then device complexity is reduced, but adaptability to physiological changes deteriorates
Solution Approach 1:
The control unit continuously monitors hemodynamic parameters (flow, pressure, heart rate) and automatically adjusts pump operating parameters based on detected deviations from target values, creating a closed-loop feedback system that adapts to physiological changes without requiring complex manual intervention
Solution Approach 2:
The pump system transitions from fixed operating parameters to dynamic, real-time parameter adjustment based on detected physiological states, allowing the pump to automatically modulate its operation according to changing cardiac conditions and patient needs
2Measurement precision
If pump systems lack sensing capabilities, then device complexity is reduced, but measurement precision of physiological parameters deteriorates
Solution Approach 1:
The control unit acts as an intermediary that receives raw sensor data from flow sensors, pressure sensors, and ECG electrodes, processes this information, and translates it into meaningful hemodynamic parameters and control commands, enabling precise measurement without requiring direct complex sensor integration
Solution Approach 2:
The control unit serves multiple functions simultaneously: it monitors flow, pressure, and ECG signals; detects physiological events; determines appropriate pump settings; and controls the pump operation, consolidating what would otherwise require multiple separate devices into a single integrated system
3Reliability
If pump systems do not react to physiological events, then ease of operation is improved, but reliability of cardiac support deteriorates
Solution Approach 1:
The pump system performs self-monitoring and self-adjustment by automatically detecting physiological events such as arrhythmias, hypotension, and volume status changes, and responding appropriately without requiring continuous external monitoring or manual intervention, thereby maintaining reliable cardiac support while simplifying operation
Data Source
AI summary
A pump system is provided comprising a diaphragm fluid pump which can be fluidically connected to a heart and/or at least one blood vessel by means of an inlet cannula and an outlet cannula and is adapted for generating a pulsatile fluid flow for supporting a cardiac activity of the heart, a working pressure source connected to the diaphragm fluid pump by means of a pressure line and adapted for providing a working pressure for driving the diaphragm fluid pump, a control unit adapted for controlling the working pressure, a first flow sensor adapted for detecting a first cannula flow signal corresponding to an inlet flow in the inlet cannula or an outlet flow in the outlet cannula, a working pressure sensor adapted for detecting a working pressure signal corresponding to the working pressure in the pressure line.