Intrathecal Access Patency Detection From CSF Pressure Signals
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Solution Overview
Problem
Maintaining patency of injection sites is crucial for effective and safe medication delivery, as blockages or obstructions can lead to improper dosing, tissue damage, and patient discomfort, yet existing methods struggle to reliably determine the patency of intrathecal access sites during drug administration.
Innovation Solution
A method and system that analyze cerebrospinal fluid (CSF) pressure signals to extract heart rate and respiratory rate components, using techniques like FFT or peak/valley processing, to determine the patency level of intrathecal access sites, providing real-time visual, audible, or tactile indications, and controlling infusion pumps based on patency levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional injection methods are used, then the procedure is simple, but patency cannot be reliably determined leading to blockages and tissue damage
Solution Approach 1:
The patent replaces mechanical patency testing methods with a sensor-based system that measures CSF pressure signals. The system uses pressure sensors to detect pressure changes in the CSF, processes these signals to identify heart rate and respiratory rate components, and determines patency based on the presence and characteristics of these physiological signals. This substitution of mechanical testing with sensor-based detection improves reliability while managing complexity through automated signal processing.
Solution Approach 2:
The patent implements a feedback mechanism where the system continuously monitors CSF pressure signals, processes them to determine patency status, and provides real-time feedback to the operator. The system can indicate patency through visual, audible, or tactile signals, allowing for immediate adjustment of injection parameters or notification of blockages before tissue damage occurs. This feedback loop significantly improves reliability of patency determination.
2Reliability
If patency monitoring is implemented, then safety and accuracy of drug delivery improve, but real-time processing complexity increases
Solution Approach 1:
The patent segments the CSF pressure signal into distinct physiological components, specifically separating the heart rate signal from the respiratory rate signal. By dividing the complex pressure waveform into these identifiable segments, the system can process each component independently using targeted algorithms, reducing overall processing complexity while maintaining comprehensive monitoring capability.
Solution Approach 2:
The patent employs dynamic signal processing techniques that adapt to varying physiological conditions. The system uses algorithms that can identify heart rate and respiratory rate components in real-time, adjusting its analysis based on the dynamic characteristics of the CSF pressure signals. This dynamic approach allows the system to handle variability in patient physiology without requiring overly complex fixed-processing systems.
3Object-affected harmful factors
If continuous patency monitoring is performed, then tissue damage is prevented, but energy consumption increases
Solution Approach 1:
The patent implements periodic sampling of CSF pressure signals rather than continuous high-frequency monitoring. The system samples pressure at intervals sufficient to capture the physiological periodicity of heart rate and respiratory rate signals, but does not require continuous high-energy monitoring. This periodic sampling approach maintains effective patency monitoring while significantly reducing energy consumption compared to continuous high-frequency analysis.
Data Source
AI summary
Determining a patency level for an intrathecal access site includes receiving a complex cerebrospinal fluid (CSF) pressure signal for an intrathecal access site, processing the complex CSF pressure signal to extract a heart rate component and a respiratory rate component, processing the heart rate component and the respiratory rate component to determine a patency level for the intrathecal access site. An indication of the patency level may be output in any of various forms such as to automatically control a pump or other device or to provide informational input to a medical provider.