Rotary ENT Navigation Adapter for EMI-Resistant Position Sensing
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Solution Overview
Problem
Existing rotary ENT instruments used in procedures like FESS and otology lack compatibility with image-guided surgery navigation systems due to electromagnetic interference from metallic shafts and end effectors, especially at high rotational speeds, and integrating position sensors directly into these instruments is challenging.
Innovation Solution
A navigation adapter with integral position sensors is designed to be selectively fitted to rotary ENT instruments, minimizing electromagnetic interference by orienting sensors orthogonally to the interference fields and using coils to communicate position data wirelessly or via cables to a processor, enabling real-time navigation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If position sensors are integrated into rotary instruments for IGS navigation, then navigation accuracy is improved, but electromagnetic interference increases
Solution Approach 1:
A non-conductive adapter made of electrically insulating material is introduced as an intermediary between the rotary instrument and position sensor. This adapter electrically isolates the conductive rotary shaft from the position sensor, preventing electromagnetic interference while maintaining mechanical coupling and navigation functionality
Solution Approach 2:
The adapter functions as a protective shell that envelops the rotary instrument shaft. This shell provides electrical insulation while allowing mechanical transmission, creating a barrier that prevents electromagnetic interference from reaching the position sensor
2Adaptability or versatility
If position sensors are integrated into rotary instruments, then compatibility with IGS navigation systems is improved, but instrument complexity increases
Solution Approach 1:
The navigation adapter is designed as a separate, modular component that can be attached to existing rotary instruments. This segmentation allows the position sensing functionality to be added without modifying the original instrument design, maintaining simplicity while achieving IGS compatibility
Solution Approach 2:
The adapter is designed with universal features including a friction-fit interface that can accommodate multiple instrument diameters and a standardized mounting interface for position sensors. This allows a single adapter design to work with various rotary instruments, reducing overall system complexity
3Measurement precision
If custom rotary instruments with integrated position sensors are manufactured, then navigation precision is improved, but cost increases
Solution Approach 1:
The adapter combines multiple functions into a single component: mechanical coupling to the rotary instrument, electrical insulation to prevent interference, and mounting structure for the position sensor. This integration reduces the need for multiple separate components and complex manufacturing processes
Solution Approach 2:
The adapter uses material property changes, specifically employing electrically insulating materials that provide both mechanical strength and electrical isolation. This parameter change allows existing conductive rotary instruments to work with non-conductive adapters, avoiding the need to manufacture entirely new instrument designs
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 adapter allows rotary ENT instruments to be compatibly integrated with IGS navigation systems, providing accurate real-time positional guidance despite electromagnetic interference, enhancing surgical precision and safety.
Implementation Method 1
a first position sensor supported by the body, the first position sensor being configured to generate a signal indicating a position of the first position sensor in three-dimensional space
Implementation Method 2
the rotary member being further configured generate interference in an electromagnetic field while rotating about the longitudinal axis
Data Source
AI summary
An apparatus includes a body and the first position sensor. The body defines a bore sized to receive a portion of a medical instrument having a rotary member. The rotary member is configured to generate interference in an electromagnetic field while rotating about a longitudinal axis. The body is configured to be fixedly secured to the medical instrument while allowing rotation of the rotary member about the longitudinal axis. The first position sensor is supported by the body and is configured to generate a signal indicating a position of the first position sensor in three-dimensional space. The first position sensor is oriented to offset the interference generated by the rotary member.