An Implantable Cranial Window Using a Collagen Membrane for Chronic Voltage-Sensitive Dye Imaging

Area of Science:

• Neuroscience
• Biomaterials Science
• Medical Devices

Background:

• Optical methods are crucial for advanced neural sensing in brain-machine interfaces.
• Voltage-sensitive dye (VSD) imaging offers high spatiotemporal resolution for neural network activity visualization.
• Current VSD imaging techniques require dura mater removal and artificial dura implantation, limiting long-term use.

Purpose of the Study:

• To develop and evaluate an atelocollagen membrane as a dura substitute for implantable neural sensing devices.
• To overcome the limitations of repeated VSD imaging imposed by current dura replacement methods.

Main Methods:

• Fabrication of a cranial chamber device with an atelocollagen membrane.
• Implantation of the device into rats to monitor frontal cortex neural activity.
• Assessment of the membrane's chemical and optical transparency for VSD staining and imaging.

Main Results:

• The atelocollagen membrane demonstrated excellent chemical transparency, allowing VSD staining.
• The membrane exhibited sufficient optical transparency for light penetration.
• Forelimb-evoked neural activity was successfully visualized through the collagen membrane in vivo.

Conclusions:

• Atelocollagen membranes serve as effective dura substitutes, enabling repeated VSD imaging.
• This biocompatible material facilitates optical access for neural activity monitoring.
• The collagen membrane shows broad applicability for various implantable neural sensing technologies.