Venous Needle Dislodgement Detection via Pressure Analysis
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Solution Overview
Problem
Current hemodialysis systems lack reliable methods to detect venous needle dislodgement, leading to potential life-threatening blood loss due to delayed or undetected needle displacement, especially during overnight procedures where visual monitoring is inadequate.
Innovation Solution
A system and method that measure and analyze venous return pressure to determine intravascular blood pressure, calculating a lower limit and comparing it to a standard to detect dislodgement, triggering an alert and shutting down the blood pump to prevent further blood loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If visual monitoring is used during hemodialysis procedures, then the procedure can be performed with simple equipment, but needle dislodgement is undetected or detected after significant time delay
Solution Approach 1:
The patent replaces visual monitoring (mechanical/manual observation) with an automated electronic pressure monitoring system. Pressure sensors continuously measure venous return pressure, and a processor automatically analyzes the pressure data to detect needle dislodgement, eliminating the need for constant visual inspection and providing immediate detection without time delay.
Solution Approach 2:
The system implements continuous feedback by monitoring venous return pressure in real-time during hemodialysis. The processor compares measured pressure values against expected pressure ranges and provides immediate feedback when dislodgement is detected, allowing for instant intervention rather than delayed detection through periodic visual checks.
2Reliability
If pressure monitoring is implemented to detect needle dislodgement, then detection reliability improves, but device complexity increases
Solution Approach 1:
The patent leverages the existing venous return pressure measurement capability that is already part of standard hemodialysis machines. By repurposing this existing sensor and measurement system for the additional function of needle dislodgement detection, the patent avoids adding separate complex monitoring equipment while still achieving reliable detection.
Solution Approach 2:
The system uses the hemodialysis machine's own pressure measurement system to monitor for needle dislodgement. The existing pressure sensors and control electronics serve dual purposes: maintaining dialysis treatment and detecting complications, eliminating the need for separate dedicated monitoring hardware.
Data Source
AI summary
A method and a system are provided for detecting a condition indicative of a dislodged needle in a hemodialysis procedure. A venous return pressure for a patient undergoing dialysis is measured. The venous return pressure is analyzed via a controller, and an intravascular blood pressure in proximity to a location of needle insertion into the patient is derived. A lower limit is calculated as a function of the intravascular blood pressure via the controller. An average of the venous return pressure is calculated via the controller during a predetermined time window. The average is compared to the lower limit via the controller, and if the average is within a specified range of the lower limit, the controller determines that a condition indicative of a dislodged needle is present.