EEG Headset Electrode Positioning via Anatomical Anchors
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Solution Overview
Problem
Current EEG headset designs are difficult for subjects to put on consistently, especially for applications like brain computer interfaces (BCI) and stroke therapy, where precise electrode placement is crucial, and patients may lack assistance in positioning the headset correctly due to motor limitations.
Innovation Solution
The development of EEG headsets with a wearable electrode registration assembly that uses anatomical anchors like the nasion, inion, and ears for consistent and precise electrode placement, combined with deformable thermoplastic strips for custom fitting and adjustable wire frame structures to accommodate individual head anatomy, ensuring accurate positioning of electrodes for ipsilateral brain signal collection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a standard EEG skullcap is used to cover the entire head, then general applicability is achieved, but consistent electrode positioning becomes difficult
Solution Approach 1:
The headset is divided into a wearable registration assembly (frame structure) and a separate electrode assembly. The registration assembly provides consistent anatomical positioning while the electrode assembly can be configured for different applications, resolving the contradiction between general applicability and positioning precision.
Solution Approach 2:
The wearable electrode registration assembly acts as an intermediary between the subject's head anatomy and the electrodes. It uses anatomical landmarks (nasion, inion, ears) to establish a reference frame that ensures consistent electrode positioning across different subjects and sessions.
2Measurement precision
If EEG headsets are designed for precise electrode placement, then signal acquisition accuracy is improved, but ease of independent operation deteriorates
Solution Approach 1:
The headset is designed with self-adjusting features including deformable thermoplastic strips that conform to the subject's head shape and wire frame structures that automatically position themselves using anatomical landmarks. This allows subjects to independently apply the headset while achieving precise electrode placement.
Solution Approach 2:
The headset incorporates deformable materials (thermoplastic strips) that change their physical properties when heated, allowing them to be molded to the subject's head anatomy. This enables precise positioning without requiring complex adjustment mechanisms or assistant help.
3Manufacturing precision
If custom fitting components are added for precise positioning, then electrode placement consistency is improved, but device complexity increases
Solution Approach 1:
The headset uses flexible thermoplastic strips instead of rigid custom-fitted components. These strips can be deformed and molded to match the subject's head anatomy, providing custom fitting without requiring complex manufacturing processes or multiple rigid parts.
Solution Approach 2:
The headset incorporates dynamically adjustable wire frame structures that can be deformed and positioned to fit different head shapes. The flexibility and adaptability of these structures reduce the need for multiple custom-fitted components while maintaining precise positioning capability.
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 solution enables consistent and precise electrode placement, facilitating effective brain signal collection for BCI applications, particularly in stroke therapy, allowing patients to use the headset independently and ensuring accurate signal acquisition across multiple sessions.
Implementation Method 1
The strips can be deformed when heated to a pliable state and then deformed to fit the anatomy of a subject's head
Data Source
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AI summary
This document discloses EEG headset designs that address shortcomings in prior art headsets and also provides headset solutions for new and useful applications utilizing EEG headsets. One such application is brain computer interface (BCI) applications, and more specifically, a BCI application for stroke therapy in which the headset is utilized to obtain ipsilateral brain signals. This document also discloses BCI devices and methods utilizing EEG headsets.