Blood Pump Flow Determination Using Current-Difference Calibration
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Solution Overview
Problem
Existing methods for calculating pump blood flow in blood pumps are inaccurate due to variations in motor currents caused by differences in blood pump catheters, leading to inconsistencies in determining the patient's own cardiac output and pump blood flow.
Innovation Solution
A method that involves obtaining a correspondence between absolute values of current differences and pump blood flow values in a simulated environment, and then adjusting these values based on actual human body environment measurements to accurately determine pump blood flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If pump blood flow is calculated based on motor current, then the calculation can be performed continuously, but the accuracy deteriorates due to variations in catheter characteristics
Solution Approach 1:
The patent applies feedback by continuously monitoring the actual pump blood flow using a flow sensor and comparing it with the current-based calculated value. The system uses this feedback to detect deviations and trigger alerts when the actual flow differs from the expected flow, thereby maintaining accuracy despite catheter variations.
Solution Approach 2:
The patent replaces the purely electrical/current-based calculation system with a hybrid system that incorporates mechanical/physical flow measurement. By introducing a flow sensor that directly measures blood flow, the system substitutes the indirect electrical measurement with a direct physical measurement, eliminating the inaccuracies caused by catheter variations.
2Adaptability or versatility
If different motors and catheters are used in blood pumps, then device versatility is improved, but measurement accuracy deteriorates due to current variations
Solution Approach 1:
The system uses feedback from flow sensors to continuously monitor actual pump blood flow and compares it against the current-based calculations. This feedback mechanism allows the system to adapt to different motor-catheter combinations by detecting actual flow performance and adjusting or alerting when expectations are not met, thereby maintaining measurement accuracy across versatile configurations.
Solution Approach 2:
The patent creates a reference model or lookup table that maps expected current values to pump blood flow values for different motor-catheter combinations. This copying approach allows the system to store and retrieve accurate flow predictions for various configurations, enabling accurate measurement across different device variants without requiring recalibration.
3Device complexity
If current-based calculation method is used, then device complexity is reduced, but measurement precision deteriorates
Solution Approach 1:
The patent introduces a flow sensor as an intermediary device that directly measures pump blood flow. This intermediary provides accurate flow data that can be used to verify or correct the current-based calculations, thereby improving measurement precision without significantly increasing overall system complexity. The flow sensor acts as a mediator between the motor-catheter system and the measurement system.
Solution Approach 2:
The system replaces the simple current-based electrical measurement with a hybrid approach that incorporates direct physical flow measurement. By adding the flow sensor, the system substitutes the indirect electrical inference with direct mechanical/physical measurement, improving accuracy while maintaining relatively simple system architecture through the use of standard flow sensing technology.
Data Source
AI summary
A pump blood flow determination method and apparatus for a blood pump, an electronic device, and a storage medium. The method comprises: (S110) obtaining a first correspondence between absolute values of first current differences and first pump blood flow values at different rotational speeds of the blood pump in an in vitro test simulation environment; (S120) obtaining first reference current values of current cycles at different rotational speeds of the blood pump in an actual human body environment of a test object; (S130) for the current cycles at the different rotational speeds, calculating differences between the first reference current values and current values at different moments within the current cycles, so as to obtain an absolute value of at least one second current difference.