Blood Pump Flow Rate Estimation via Motor Current and Blood Attributes
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Solution Overview
Problem
The accuracy of flow rate estimation for implantable blood pumps is compromised due to individual differences in pump properties, leading to inadequate medical treatment outcomes.
Innovation Solution
A method that estimates the flow rate of a blood pump using rotational speed, motor current, and patient blood attribute data, forming specific flow rate estimation information for each pump to account for individual differences, allowing for accurate estimation without invasive measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a blood flow meter is mounted inside the body to measure flow rate accurately, then measurement precision is improved, but the invasiveness to the patient increases and the duration of the invasive procedure becomes problematic
Solution Approach 1:
The patent replaces the mechanical/physical blood flow meter system with an estimation system that uses electrical measurements (motor current, rotational speed) and mathematical modeling to determine flow rate. This substitution eliminates the need for invasive internal sensors while maintaining measurement capability through alternative physical principles.
Solution Approach 2:
The patent introduces an intermediary estimation system that uses readily available motor parameters (current, rotational speed) and blood properties (viscosity, density) as mediators to infer flow rate without direct measurement. This intermediary approach bridges the gap between non-invasive measurements and accurate flow rate determination.
2Loss of information
If a blood flow meter is used to measure flow rate, then flow rate information is obtained, but the measurement steps become cumbersome and the procedure becomes invasive
Solution Approach 1:
The patent enables the blood pump system to self-determine its own flow rate using its own operational parameters (motor current, rotational speed) combined with blood properties. This self-service capability eliminates the need for external measurement devices and complex measurement procedures, allowing the system to provide its own flow rate information.
Solution Approach 2:
The patent replaces the complex mechanical blood flow meter measurement system with an electrical and computational system that uses motor parameters and mathematical relationships to determine flow rate, significantly simplifying the measurement procedure.
3Device complexity
If general flow rate estimation methods are used without considering individual pump differences, then the estimation process is simplified, but the estimation accuracy deteriorates due to individual differences in pump properties
Solution Approach 1:
The patent applies local quality by creating individualized estimation characteristics for each blood pump based on its specific properties (impeller diameter, motor characteristics). This allows the estimation method to be tailored to each pump's unique characteristics, improving accuracy without requiring overly complex general models.
Solution Approach 2:
The patent changes the estimation approach by incorporating pump-specific parameters (impeller diameter, motor constants) into the estimation model. This parameter customization allows the system to adapt to individual pump variations, maintaining accuracy while managing complexity through systematic parameter integration.
Data Source
AI summary
In a flow rate estimation method of a blood pump, a general flow rate estimation formula which includes a correction term is formed based on a plurality of blood pumps. Measured data obtained from an objective blood pump implanted inside a patient is substituted into the correction term, thus forming a flow rate estimation formula of the objective blood pump. The flow rate Q of the objective blood pump is estimated based on the flow rate estimation formula and the values of the rotational speed N and the consumption current I of the motor of the objective blood pump, and the attribute data Z of the blood of the patient.