Electromagnetic Navigation System for Dental Implants
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Solution Overview
Problem
Electromagnetic tracking systems in dental implant surgery face challenges due to limited tracking accuracy at increased distances from the field generator and interference from magnetic or ferromagnetic objects, leading to tracking errors and reduced precision.
Innovation Solution
An electromagnetic navigation system with a field generator, a passive articulating arm, and a parallel manipulator that adjusts the position and orientation of the field generator to maintain the surgical site and tool within a region of maximum accuracy, and includes noise filtering to minimize interference from surgical tools.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the distance between the electromagnetic sensor and field generator is increased to accommodate larger surgical field, then the tracking volume is expanded, but the tracking accuracy and precision degrade
Solution Approach 1:
The field generator is mounted on a movable platform that can dynamically adjust its position relative to the surgical site. This allows the system to optimize the distance between the field generator and electromagnetic sensors during different phases of surgery, maintaining maximum tracking accuracy while accommodating varying surgical requirements
Solution Approach 2:
The system changes the spatial parameters of the field generator position and orientation to optimize the electromagnetic field distribution. By adjusting these parameters, the system maintains high tracking accuracy across different distances and positions of electromagnetic sensors within the tracking volume
2Adaptability or versatility
If magnetic or ferromagnetic objects are present in the operating environment to perform surgical functions, then surgical capability is enhanced, but measurement bias and tracking errors increase
Solution Approach 1:
The system introduces an intermediary compensation mechanism that detects and corrects for magnetic interference. The navigation system processes signals from multiple electromagnetic sensors and uses computational algorithms to compensate for field distortions caused by magnetic objects, maintaining tracking precision despite the presence of ferromagnetic surgical instruments
Solution Approach 2:
The system continuously monitors tracking quality and uses feedback to detect degradation in measurement precision. When magnetic interference is detected, the system adjusts the electromagnetic field generator position or modifies the tracking algorithm to compensate for the interference, maintaining surgical capability while correcting measurement bias
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
Enhances tracking accuracy and precision by maintaining the surgical site and tool within a region of maximum accuracy and reduces noise interference, thereby improving the accuracy of dental implant placement.
Implementation Method 1
an electromagnetic field generator may be placed near a surgical site to establish a coordinate space
Data Source
AI summary
A system for electromagnetic navigation in dental implant placement may include an electromagnetic tracking system that may be configured to track positions and orientations of a plurality of electromagnetic sensors. An exemplary electromagnetic tracking system may include a field generator that may be attached to a dental unit utilizing a positioning arm. An exemplary system may further include a control unit that may be coupled to the electromagnetic tracking system and the positioning arm. The control unit may be configured to receive the tracked positions of the plurality of the electromagnetic sensors from the electromagnetic tracking system and to adjust at least a position or an angular orientation of the field generator to maintain the plurality of the electromagnetic sensors within a volume of interest within the tracking volume.