Implantable Blood Pump Suction Response Algorithm
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Solution Overview
Problem
Implantable blood pumps face challenges in maintaining optimal flow rates, as excessive flow can create suction conditions leading to ventricular collapse and insufficient circulatory assistance, while insufficient flow can result in rapid decline of flow rates and inadequate patient support.
Innovation Solution
A controller for an implantable blood pump is configured with processing circuitry to initiate a suction response algorithm if a combination of detected suction events multiplied by a suction event variable and non-suction events multiplied by a non-suction event variable exceeds a predetermined threshold, thereby adjusting the pump speed to prevent suction conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the blood pump operates at a high flow rate to provide sufficient circulatory assistance, then the patient receives adequate blood flow support, but the pump creates suction conditions causing ventricular collapse
Solution Approach 1:
The control system continuously monitors pump operation parameters and detects suction events, then adjusts pump speed in response to these detections. This closed-loop feedback mechanism allows the pump to maintain high flow rates when needed while automatically reducing speed when suction conditions are detected, thereby preventing ventricular collapse.
Solution Approach 2:
The pump operating speed is made dynamically adjustable based on real-time detection of suction events. The control system varies the pump speed according to the detected suction conditions, transitioning between high-speed operation for adequate blood flow and low-speed operation to prevent suction, thus resolving the contradiction between productivity and harmful effects.
2Object-affected harmful factors
If the blood pump reduces flow rate to prevent suction conditions, then ventricular collapse is avoided, but the circulatory assistance becomes insufficient
Solution Approach 1:
The control system uses feedback from suction event detection to dynamically adjust pump speed. When suction events are detected indicating approaching ventricular collapse, the system reduces flow rate to prevent collapse. When suction conditions are avoided, the system can increase flow rate to provide sufficient circulatory assistance, thus resolving the contradiction through adaptive control.
Solution Approach 2:
The pump operates with variable flow rate parameters adjusted in response to detected suction events. By changing the flow rate parameter dynamically based on real-time conditions, the system prevents ventricular collapse while maintaining sufficient circulatory assistance when conditions permit, resolving the contradiction between avoiding harmful effects and maintaining productivity.
3Speed
If the pump speed is increased to respond quickly to suction events, then ventricular collapse is prevented, but the flow rate becomes insufficient for patient support
Solution Approach 1:
The control system implements periodic monitoring of suction events at defined intervals, allowing the pump to maintain steady high-speed operation for adequate blood flow while periodically checking for suction conditions. This periodic detection approach enables quick response to suction events without continuously reducing flow rate, thus resolving the contradiction between response speed and productivity.
Data Source
AI summary
A controller for an implantable blood pump includes processing circuitry configured to initiate a suction response algorithm if a combination of a number of detected suction events multiplied by a suction event variable and a number of non-suction events multiplied by a non-suction event variable exceed a predetermined threshold.