Compliant EMG Endotracheal Tube Cuff for Stable Vocal Fold Contact
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Solution Overview
Problem
Existing endotracheal tubes with integrated electrodes for electromyographic (EMG) monitoring face challenges in maintaining consistent contact with the vocal folds during surgery, leading to potential trauma and inconsistent signal quality.
Innovation Solution
The design incorporates a compliant electrode cuff and anchoring cuff with differential diameters and compliance, ensuring secure sealing and minimal trauma by using pressurized fluid inflation, along with conductive electrodes positioned to optimize contact with the vocal folds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a rigid electrode cuff is used to ensure stable contact with vocal folds, then contact consistency is improved, but trauma to the vocal folds increases
Solution Approach 1:
The patent applies parameter changes by modifying the mechanical properties of the electrode cuff through selective inflation. By controlling the volume of inflation fluid, the system dynamically adjusts the cuff's radial expansion and contact pressure with the vocal folds, transitioning from a rigid state (risking trauma) to a compliant state (ensuring consistent contact without damage).
Solution Approach 2:
The electrode cuff transitions from a static, rigid structure to a dynamic, adaptable structure through fluid inflation. The cuff's compliance and contact characteristics change in real-time based on the inflation volume, allowing the system to optimize both trauma prevention and contact consistency during surgical procedures.
2Reliability
If the electrode cuff diameter is increased to improve sealing, then sealing effectiveness is improved, but the cuff compliance and ability to conform to vocal folds decreases
Solution Approach 1:
The endotracheal tube is segmented into distinct functional zones: an anchoring cuff for sealing (with larger diameter) and an electrode cuff for EMG monitoring (with smaller, compliant diameter). This segmentation allows each zone to be optimized for its specific function without compromising the other.
Solution Approach 2:
Different regions of the tube have different diameters and compliance characteristics. The anchoring cuff has larger diameter for sealing, while the electrode cuff has smaller diameter with higher compliance for conforming to vocal folds. This local differentiation resolves the contradiction between sealing effectiveness and cuff compliance.
3Object-affected harmful factors
If the electrode cuff is made more compliant to reduce trauma, then trauma is reduced, but contact stability with vocal folds deteriorates
Solution Approach 1:
The system uses EMG signal feedback to monitor vocal fold contact quality in real-time. When contact stability deteriorates, the feedback mechanism allows adjustment of inflation volume to optimize the balance between compliance (trauma reduction) and contact stability.
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 configuration maintains stable EMG signal monitoring by reducing trauma and ensuring consistent electrode contact with the vocal folds, enhancing surgical safety and monitoring efficacy.
Implementation Method 1
Pressurized fluid is provided through the interior conduit to inflate the electrode cuff and the anchoring cuff
Implementation Method 2
an electrode cuff compliance wherein the anchoring cuff compliance is equal to the electrode cuff compliance
Data Source
Figure 1
Figure 2A~2C
Figure 3
AI summary
An apparatus for monitoring EMG signals of a patient, comprising: an endotracheal tube (100); a conduit (106) configured to extend along the endotracheal tube; a first cuff (114) having an exterior surface defining a first diameter and fluidly coupled to the conduit, the first cuff exhibiting a first compliance such that the first diameter expands to a first distance when pressurized fluid is within the interior conduit; a second cuff (116) having an exterior surface defining a second diameter, positioned distal the first cuff and fluidly coupled to the conduit, the second cuff exhibiting a second compliance equal to the first compliance and defined such that the second diameter expands to a second distance greater than the first distance when pressurized fluid is within the conduit, wherein upon inflation of the first cuff and the second cuff from fluid provided in the conduit, the first cuff exhibits a first wall tension on the exterior surface thereof and the second cuff exhibits a second wall tension on the exterior surface thereof, the first tension being less than the second tension; and conductive ink electrodes (112) formed on the exterior surface of the first cuff.