High efficiency electrodes for deep brain stimulation.

Area of Science:

• Biomedical Engineering
• Neuroscience
• Medical Devices

Background:

• Deep brain stimulators (DBS) rely on primary cell batteries requiring surgical replacement upon depletion.
• Current DBS electrode designs may have suboptimal power efficiency.
• Extending DBS device longevity is crucial for patient well-being and healthcare costs.

Purpose of the Study:

• To investigate novel electrode geometries for deep brain stimulators to enhance neuronal stimulating efficiency.
• To reduce power consumption of DBS devices through improved electrode design.
• To increase the lifespan of implanted DBS devices, thereby reducing the frequency of replacement surgeries.

Main Methods:

• Utilized finite element modeling to simulate cylindrical DBS electrodes with conventional and novel high-perimeter designs (serpentine, segmented).
• Quantified neuronal activation by modeling 100 axons around electrodes and applying cathodic stimuli.
• Analyzed input-output curves to determine the percentage of activated axons relative to stimulation intensity.

Main Results:

• High-perimeter electrodes significantly increased current density variation on the electrode surface.
• Novel electrode geometries demonstrated reduced power consumption: up to ~20% for parallel axons and ~35% for perpendicular axons.
• Increased stimulation efficiency was observed with the novel electrode designs.

Conclusions:

• Novel high-perimeter electrode designs for DBS can significantly improve stimulating efficiency.
• These designs offer a potential reduction in power consumption, leading to extended device lifetime.
• Reduced power needs can decrease the frequency of surgical interventions for battery replacement, lowering associated risks and costs.