Pressure Sensor Catheter for Hemodialysis Dislodgment Detection
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Solution Overview
Problem
During hemodialysis, existing technologies lack effective methods to detect and address the dislodgment of medical devices from the patient's vasculature in real-time, leading to potential blood loss and complications if not promptly corrected.
Innovation Solution
A system comprising an elongate member with a pressure sensor configured to generate a pressure signal indicative of pressure adjacent to the device, coupled with processing circuitry to detect dislodgment by comparing the pressure signal with a threshold, and generating an output to alert users to reposition the device, thereby preventing blood loss and ensuring safe treatment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If real-time pressure monitoring is implemented to detect dislodgment, then patient safety is improved, but device complexity increases
Solution Approach 1:
The pressure sensor is integrated within the elongate member structure, with the sensor positioned inside or on the surface of the catheter/needle. This nesting approach allows the monitoring function to be incorporated into the existing device without significantly increasing external complexity or requiring separate monitoring apparatus.
Solution Approach 2:
The patent replaces complex mechanical dislodgment detection mechanisms with a simpler pressure-based sensing system. By using pressure sensors to detect changes in blood pressure or flow pressure that indicate dislodgment, the system achieves reliable monitoring with less mechanical complexity compared to traditional mechanical position-sensing methods.
2Difficulty of detecting and measuring
If pressure sensors are integrated into the elongate member, then dislodgment detection capability is improved, but manufacturing complexity increases
Solution Approach 1:
The pressure sensor is positioned at specific locations on the elongate member where dislodgment would cause detectable pressure changes. This localized sensing approach focuses manufacturing complexity only at critical points rather than requiring complex sensing throughout the entire device, simplifying the overall manufacturing process.
3Measurement precision
If continuous pressure monitoring is performed, then detection accuracy is improved, but energy consumption increases
Solution Approach 1:
The pressure monitoring system performs measurements at periodic intervals rather than truly continuous monitoring. The processing circuitry evaluates pressure signals at defined sampling rates, which maintains adequate detection accuracy for clinical purposes while significantly reducing energy consumption compared to continuous high-frequency sampling.
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
The system enables timely detection and intervention for dislodgment of medical devices, reducing blood loss and improving the safety and efficacy of hemodialysis treatments by automatically controlling the dialysis unit and providing user notifications.
Implementation Method 1
a pressure sensor configured to generate a pressure signal indicative of pressure adjacent the elongate member
Data Source
AI summary
In examples described herein, a system includes an elongate member configured to be introduced into vasculature of a patient. The elongate member includes a pressure sensor configured to generate a pressure signal indicative of pressure in the vasculature adjacent the needle. The system includes processing circuitry configured to receive the pressure signal from the pressure sensor, detect, based on the pressure signal, dislodgment of the elongate member from the vasculature, and generate an output in response to detecting the dislodgment of the elongate member from the vasculature.