Catheter Malfunction Detection via Pressure Pulse Analysis
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Solution Overview
Problem
Implantable medical devices face challenges in detecting catheter malfunctions such as leaks and blockages, which can prevent therapeutic substances from reaching the intended delivery site, and existing methods fail to accurately differentiate between these issues and other potential failures like power or pump issues.
Innovation Solution
The system uses pressure sensing to analyze changes in fluid pressure within the catheter, including peak pressure and decay time, to identify malfunctions by delivering pulses and measuring the resulting pressure curves, allowing for real-time or offline analysis to determine the presence of leaks, blockages, or gas bubbles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If pressure sensing is implemented to detect catheter malfunctions, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The system uses the pump's own pressure generation capability to detect catheter malfunctions. The pump creates pressure pulses during normal operation, and the pressure sensor detects changes in these pulses that indicate malfunctions. This eliminates the need for separate testing mechanisms or additional complexity.
Solution Approach 2:
The pressure sensing system serves multiple functions: it monitors catheter patency, detects leaks, identifies blockages, and provides data for distinguishing between different types of failures (catheter vs. pump vs. power). This multi-functionality justifies the added complexity by providing comprehensive monitoring capabilities.
2Reliability
If real-time pressure analysis is performed to identify malfunctions, then reliability is improved, but use of energy increases
Solution Approach 1:
The system performs pressure analysis periodically during pump operation rather than continuously. Pressure pulses are captured during each pump cycle, and analysis is performed on these discrete samples. This periodic approach reduces energy consumption compared to continuous monitoring while maintaining reliable detection capability.
Solution Approach 2:
The pump's own operation provides the energy source for pressure generation, eliminating the need for separate energy-intensive testing procedures. The pressure sensor uses the pump's inherent pressure pulses to detect malfunctions, rather than requiring additional active energy input for detection.
3Measurement precision
If comprehensive malfunction detection is implemented, then measurement precision is improved, but difficulty of detecting and measuring increases
Solution Approach 1:
The system continuously monitors pressure pulse characteristics and compares them against expected patterns. When deviations are detected, the system identifies the type of malfunction based on the specific pressure signature. This feedback loop enables automated differentiation between leak, blockage, and other failures without requiring complex manual analysis.
Solution Approach 2:
The system detects different malfunction types by monitoring changes in pressure parameters such as peak pressure, decay time, and pulse shape. Each malfunction (leak, blockage, disconnection) produces a distinct pressure signature pattern, allowing the system to differentiate between them based on characteristic parameter changes rather than complex multi-sensor analysis.
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
This approach enables accurate detection of catheter malfunctions, ensuring that therapeutic substances are effectively delivered to the intended site, reducing the risk of misdiagnosis and improving patient outcomes by distinguishing between different types of failures.
Implementation Method 1
analyzing changes in the pressure of fluids being pumped through the delivery lumen of the catheter
Data Source
AI summary
Methods and systems for determining whether a catheter malfunction is present in a catheter by analyzing changes in the pressure of fluids being pumped through the delivery lumen of the catheter. The pressure changes that may be monitored may include, e.g., the peak pressure within the catheter and/or the pressure decay profile. The catheter malfunctions that may be determined using the methods and systems of the invention may include, e.g., leaks, blockages, the presence of gas bubbles, etc.