Closed-loop Sodium Sensor for Cerebral Edema Infusion Control
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Solution Overview
Problem
Current methods for administering hypertonic saline in treating cerebral edema and intracranial hypertension are slow and labor-intensive, relying on intermittent blood sampling and calculations that fail to account for varying sodium excretion rates and body water changes, leading to potential complications such as osmotic demyelination syndrome or rebound cerebral edema.
Innovation Solution
A closed-loop control system for intravenous hypertonic saline administration using an infusion pump and a sodium sensor for continuous monitoring, allowing real-time adjustments based on plasma sodium concentration to maintain a therapeutic window.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If traditional intermittent blood sampling and manual calculation methods are used for hypertonic saline administration, then the process is simpler to implement, but the treatment speed is slow and cannot respond to real-time changes in plasma sodium level
Solution Approach 1:
The patent implements a closed-loop control system where plasma sodium concentration is continuously monitored by a sensor, and the infusion pump automatically adjusts HTS administration rate based on real-time feedback. This feedback mechanism enables rapid response to sodium level changes while maintaining therapeutic targets, resolving the contradiction between treatment speed and system complexity.
Solution Approach 2:
The system enables self-regulating HTS administration through automated control algorithms that continuously adjust infusion rates based on measured sodium concentrations. The closed-loop system performs self-correction without requiring manual intervention, achieving fast treatment response while reducing operational complexity.
2Measurement precision
If frequent blood sampling is performed to monitor plasma sodium concentration, then measurement accuracy is improved, but loss of time and labor increases
Solution Approach 1:
The patent employs continuous monitoring of plasma sodium concentration through an implanted or indwelling sensor that provides uninterrupted real-time data. This continuous measurement eliminates the need for repeated blood sampling while maintaining high measurement precision, thereby resolving the contradiction between measurement accuracy and time loss.
Solution Approach 2:
The manual blood sampling and laboratory analysis process is replaced with an automated electrochemical or optical sensor system that continuously measures sodium concentration in real-time. This substitution eliminates the time-consuming mechanical process of blood draws and lab processing while maintaining or improving measurement precision.
3Productivity
If manual adjustment of infusion pump by nurse based on physician orders is used, then ease of operation is maintained, but productivity is reduced due to labor-intensive process
Solution Approach 1:
The infusion pump is equipped with automated control algorithms that self-adjust HTS administration rates based on real-time sodium concentration measurements. The system performs self-regulation without requiring nurse intervention or physician orders for each adjustment, significantly improving treatment efficiency while maintaining ease of operation through programmable automation.
Solution Approach 2:
The closed-loop system provides real-time feedback from sodium sensors to the infusion pump controller, enabling automatic adjustment of infusion rates. This feedback-driven automation eliminates manual intervention steps while maintaining operational simplicity through programmed control logic, resolving the contradiction between productivity and ease of operation.
Data Source
AI summary
A hypertonic saline (HTS) administration system comprising a sodium sensor for continuous monitoring of sodium concentration of a patient at a predetermined frequency, a infusion pump for delivery of HTS to the patient and a controller for adjusting the infusion rate of an infusion pump based on real-time measurement of sodium concentration of the patient. The sodium sensor comprises a sensor cable for placement through a catheter to position a distal sensor tip at a selected in vivo sensor site. A proximal end of the sensor cable seats within a connector fitting mounted on the catheter at a convenient and accessible subcutaneous position. The connector fitting couples the sensor cable to the controller which adjusts the infusion rate of the infusion pump.