Endotracheal Tube Bite-Force Monitoring for Self-Extubation Detection
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Solution Overview
Problem
Current methods for detecting patient agitation, discomfort, and self-extubation attempts during mechanical ventilation are inadequate, particularly in critical care settings, as they lack continuous monitoring and often result in false alarms and increased hospital stay due to unplanned extubations.
Innovation Solution
A system that includes a force sensor integrated with the endotracheal tube or a bite block, connected to a controller, which analyzes biting force data to detect agitation and potential self-extubation attempts, providing continuous surveillance and alerting medical teams.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If continuous monitoring of patient agitation and self-extubation attempts is implemented, then patient safety and monitoring quality are improved, but device complexity and cost increase
Solution Approach 1:
The force sensor is integrated directly into the endotracheal tube structure, merging the monitoring function with the existing tube. This eliminates the need for separate external sensors and complex installation systems, thereby improving patient safety through continuous monitoring while minimizing additional device complexity
Solution Approach 2:
The endotracheal tube itself serves dual purposes: maintaining airway patency and detecting patient agitation or self-extubation attempts through the integrated force sensor. The tube monitors its own interaction forces with the patient's bite, eliminating the need for separate monitoring equipment and reducing overall system complexity
2Measurement precision
If force sensor is integrated into endotracheal tube, then detection precision of agitation and self-extubation attempts is improved, but manufacturing complexity increases
Solution Approach 1:
The force sensor is embedded within the endotracheal tube structure during manufacturing, combining two components into one integrated unit. This approach improves measurement precision by ensuring the sensor is positioned exactly where needed (at the tube surface contacting patient teeth) while managing manufacturing complexity through integrated production processes
Solution Approach 2:
The endotracheal tube is designed to perform multiple functions: airway maintenance, patient identification (via unique ID), and force detection for agitation monitoring. By making the tube itself multi-functional with an integrated sensor, the system achieves high detection precision without requiring separate specialized manufacturing processes for additional components
3Measurement precision
If SERAT score is used for risk assessment, then identification of patients at risk is improved, but false alarm rate increases
Solution Approach 1:
The system continuously monitors bite force in real-time and provides immediate feedback when threshold levels are exceeded, rather than relying on periodic manual assessments. This continuous feedback mechanism improves the accuracy of agitation detection and reduces false alarms by responding only to actual critical events rather than routine variations
Solution Approach 2:
The manual SERAT score assessment system is replaced with an automated electronic force sensing system. The mechanical/manual evaluation process is substituted with electronic sensors that objectively measure bite force, eliminating human subjectivity and interpretation errors that lead to false alarms while maintaining accurate identification of at-risk patients
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 effectively reduces the incidence of unplanned extubations and improves patient monitoring by providing real-time alerts, thereby reducing hospital stay and preventing nosocomial pneumonia, while minimizing false alarms and enhancing sedation management.
Implementation Method 1
force signals generated by a force sensor coupled to the endotracheal tube
Data Source
AI summary
A method of monitoring patient use of an endotracheal tube with a ventilator includes receiving in a controller, such as in a stand-alone monitoring device or in the ventilator itself, force data indicative of a biting force of the patient on the endotracheal tube, wherein the force data is based on force signals generated by a force sensor coupled to the endotracheal tube (e.g., either directly or by way of a bite block). The method further includes analyzing the force data in the controller, and determining in the controller from the analyzing of the force data that the force data is indicative of one or more of: (i) at least a predetermined threshold level of agitation or discomfort of the patient, and (ii) a current or likely attempt to self-extubate by the patient.