Implantable Blood Pump Pressure Algorithm
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Solution Overview
Problem
Implantable blood pumps face challenges in managing differential pressure, which can lead to harmful pressure buildups and suction conditions, and existing control systems often require detection of low flow conditions to prevent these issues.
Innovation Solution
An implantable blood pump system with a control circuit that determines flow rate based on rotor thrust and speed, and adjusts operation to prevent high pressure conditions by comparing differential pressure to a threshold, reducing speed when necessary, and using back electromotive force (BEMF) measurements to monitor and control pump operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the pump operates at high speed to maintain adequate blood flow, then productivity is improved, but differential pressure may build up to harmful levels
Solution Approach 1:
The control circuit continuously monitors differential pressure across the pump and adjusts rotor speed in real-time based on pressure feedback. When pressure approaches threshold levels, the system automatically reduces speed to prevent harmful buildup, while maintaining high flow rates when pressure is acceptable.
Solution Approach 2:
The system dynamically adjusts operating parameters (rotor speed) based on real-time pressure conditions rather than operating at fixed high speed. This allows the pump to adapt between high-performance mode and pressure-safe mode, optimizing both productivity and safety.
2Object-affected harmful factors
If the pump speed is reduced to prevent pressure buildup, then harmful factors are reduced, but blood flow rate decreases
Solution Approach 1:
The control circuit uses continuous pressure monitoring to determine when speed reduction is necessary. Speed is only reduced when pressure approaches threshold levels, and maintained at high levels when pressure is acceptable, thus minimizing the impact on blood flow rate while still preventing harmful pressure buildup.
3Device complexity
If the system waits for low flow condition detection to prevent pressure buildup, then device complexity is reduced, but pressure buildup may occur before detection
Solution Approach 1:
The control circuit proactively monitors differential pressure and takes preventive action by reducing pump speed before harmful pressure buildup occurs or before low flow conditions develop. This early intervention prevents the harmful conditions from occurring in the first place, rather than reacting after they are detected.
Solution Approach 2:
The system uses real-time pressure feedback to trigger speed adjustment before harmful conditions develop. The control circuit continuously compares pressure against threshold values and preemptively reduces speed when pressure approaches concerning levels, preventing both pressure buildup and low flow conditions.
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 system effectively regulates differential pressure across the pump, preventing harmful buildups and ensuring safe operation by dynamically adjusting the rotor speed based on flow rate and pressure conditions, thereby enhancing patient safety.
Implementation Method 1
the parameter may be based on back electromotive force (BEMF) in one or more of the plurality of coils
Data Source
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AI summary
The presence or absence of a high pressure condition in an implantable blood pump (101, 1001) is determined at least in part based on a comparison between a determined amount of differential pressure across the pump and a pressure threshold value. The amount of differential pressure parameter may be determined based at least in part on a parameter related to flow, such as a parameter related to thrust on the rotor (120, 1020) of the pump. In response to determining the presence of a high pressure condition, an updated speed of rotation of the rotor that is less than the rotor's initial speed may be determined. The rotor's speed may be increased when the flow rate of blood is determined to be at least equal to a flow recovery threshold value.