3D Tracking-Assisted Brain Mapping with Cortical Stimulator
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Solution Overview
Problem
Current neurosurgical procedures face challenges in accurately localizing critical brain regions such as motor, vision, and language functions due to anatomical variation and brain shift during surgery, limiting the accuracy of preoperative imaging and requiring intraoperative mapping techniques like awake neurosurgery with paper tags.
Innovation Solution
The integration of a cortical stimulator device with stereotactic navigation and 3D tracking systems using infrared reflective spheres, allowing for precise stimulation and digital tagging of brain regions, and providing real-time alerts and feedback to surgeons to avoid critical areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If preoperative imaging and anatomical knowledge are used to localize critical brain regions, then the planning process is efficient and non-invasive, but the accuracy is reduced due to anatomical variation and brain shift during surgery
Solution Approach 1:
The system performs preliminary functional mapping by delivering electrical stimuli through the cortical stimulator before final surgical resection. This preliminary action identifies critical functional regions in advance, allowing the surgical plan to be adjusted accordingly before actual tissue removal begins, thus resolving the uncertainty between preoperative imaging accuracy and intraoperative brain shift
Solution Approach 2:
The system implements real-time feedback by monitoring patient responses (motor, sensory, language) during electrical stimulation and immediately updating the functional map display. This closed-loop feedback mechanism allows continuous verification and refinement of functional region locations throughout the surgical procedure, maintaining high localization accuracy despite brain shift
2Measurement precision
If intraoperative brain mapping with paper tags is used to identify critical regions, then functional localization accuracy is improved, but the device complexity and surgical time increase
Solution Approach 1:
The system replaces the mechanical paper tag marking system with a digital 3D tracking and visualization system. Instead of physically marking the brain surface with paper tags, the system uses infrared tracking cameras to monitor the cortical stimulator position and displays functional region boundaries on a monitor, significantly reducing device complexity while maintaining identification accuracy
Solution Approach 2:
The system creates a digital 3D copy of the patient's brain surface geometry from preoperative imaging and reconstructs it in real-time during surgery. This virtual model is overlaid with functional region boundaries, eliminating the need for physical paper tags while providing the same critical information to the surgeon
3Ease of operation
If the brain is repositioned on the operating table during surgery, then surgical access to different regions is improved, but the brain shifts relative to preoperative imaging coordinates
Solution Approach 1:
The system dynamically adapts to brain repositioning by continuously tracking the cortical stimulator's position in 3D space using infrared cameras. When the brain is repositioned for surgical access, the tracking system automatically updates the coordinate transformation between the physical surgical field and the preoperative imaging data, maintaining alignment precision throughout the procedure
Solution Approach 2:
The system adds a temporal dimension to the mapping process by performing functional stimulation and mapping at multiple time points during surgery. This time-based sampling captures brain position changes due to repositioning or shift, allowing the system to maintain accurate functional region localization throughout the dynamic surgical environment
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 approach enhances the accuracy of brain mapping by providing sub-millimeter precision and real-time awareness of critical brain regions, reducing the reliance on paper tags and improving the safety and efficacy of neurosurgical procedures.
Implementation Method 1
a plurality of infrared (IR) reflective spheres attached to the proximal end portion of the main body
Data Source
AI summary
Systems and methods are described for functional brain mapping using neuronavigational equipment and additional features. For example, some implementations described combine novel cortical stimulator tools with stereotactic navigation for three-dimensional position tracking of the cortical stimulator tools. In some implementations, the systems and methods described herein can be used on an awake patient. In some implementations, the systems and methods described herein can be used on a patient that is asleep, via motor evoked potentials (MEPs), phase reversal, or electromyography (EMG) monitoring. Accordingly, in some cases sensory and language regions of the brain can be identified in addition to motor regions.