VAD Diurnal Rhythm Detection via Power MACD Analysis
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Solution Overview
Problem
Detecting disruptions in the diurnal rhythm of patients with implantable blood pumps is challenging due to sensor calibration issues and increased power consumption associated with implanting sensors on ventricular assist devices.
Innovation Solution
A system that calculates the Moving Average Convergence Divergence (MACD) based on power consumption by the implantable blood pump to maintain constant rotational speed and generates an alert when the MACD does not cross a predetermined zero line within a specified time threshold, indicating a loss of diurnal rhythm, which can be correlated with adverse events like thrombus and tachycardia.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sensors are implanted into or onto the VAD to detect operating parameters, then measurement precision is improved, but device complexity increases and power consumption increases
Solution Approach 1:
The VAD system uses its existing power consumption measurements to detect diurnal rhythm disruptions without requiring additional sensors. The controller analyzes power consumption data that is already being collected for other operational purposes, allowing the system to self-monitor patient physiological patterns without external intervention or additional hardware.
Solution Approach 2:
The existing power consumption measurement system serves multiple functions: it monitors pump operation and simultaneously detects diurnal rhythm disruptions. By analyzing the temporal patterns of power consumption, the same hardware infrastructure is used for both operational control and physiological monitoring, eliminating the need for separate sensor systems.
2Measurement precision
If sensors are implanted into or onto the VAD to detect operating parameters, then measurement precision is improved, but power consumption increases
Solution Approach 1:
The system repurposes existing power consumption measurements for dual use: operational control and diurnal rhythm detection. No additional power is allocated to new sensors because the monitoring function is derived from data already being collected by the controller during normal pump operation.
Solution Approach 2:
The system transforms the interpretation of existing power consumption data by applying MACD analysis to detect temporal patterns. Instead of measuring new physical parameters with additional sensors, the system changes how existing power consumption measurements are analyzed to extract physiological information about diurnal rhythms.
3Loss of information
If additional sensors are added to the VAD system, then detection capability is improved, but ease of operation deteriorates due to calibration requirements
Solution Approach 1:
The controller automatically performs the analysis of power consumption patterns to detect diurnal rhythm disruptions without requiring external calibration or adjustment by healthcare providers. The MACD calculation and threshold comparison are automated processes that eliminate manual calibration steps.
Data Source
AI summary
A method of detecting a disruption in a diurnal rhythm of a patient having an implantable blood pump comprising calculating a moving average convergence divergence (MACD) based on power consumed by the implantable blood pump to maintain a constant rotational speed of an impeller of the implantable blood pump and generating an alert when the calculated MACD does not cross a MACD zero line for a predetermined MACD zero line crossing time threshold.