An Implantable Ciliary Muscle LFP Recording and Transmitting System

Area of Science:

• Biomedical Engineering
• Ophthalmology
• Neuroscience

Background:

• Accurate measurement of ciliary muscle activity is crucial for understanding ocular physiology and developing treatments for eye conditions.
• Existing methods for monitoring intraocular physiological signals are often invasive or limited in scope.

Purpose of the Study:

• To present a novel sclera-attachable eye implant designed for measuring local field potentials (LFPs) from the ciliary muscle.
• To demonstrate the feasibility of this implant in a preclinical setting for real-time physiological monitoring.

Main Methods:

• Development of a compact, sclera-attachable implantable device.
• Integration of a single differential channel with a programmable gain amplifier and a sampling rate of up to 250 Hz.
• In vivo testing to validate measurement quality and system performance.

Main Results:

• The implant successfully recorded ciliary muscle LFPs in real-time with data filtering capabilities.
• The system demonstrated a measurement run-time of up to 80 hours on a CR1025 coin cell battery.
• Investigated battery non-idealities and implemented measures to enhance measurement quality and operational duration.

Conclusions:

• The sclera-attachable eye implant is a viable tool for preclinical assessment of ciliary muscle LFPs.
• The device offers a promising platform for long-term, in vivo physiological monitoring within the orbital cavity.
• Further development could lead to advanced diagnostic and therapeutic applications in ophthalmology.