Avoiding Internal Capsule Stimulation With a New Eight-Channel Steering Deep Brain Stimulation Lead

Area of Science:

• Neurosurgery
• Biomedical Engineering
• Computational Neuroscience

Background:

• Novel deep brain stimulation (DBS) lead designs aim to improve therapeutic efficacy by steering electrical fields.
• Current cylindrical contact (CC) leads may lack precision in targeting specific neural populations.
• Understanding lead performance is critical for optimizing DBS therapy.

Purpose of the Study:

• To evaluate the performance of a new eight-channel steering-DBS lead.
• To compare the steering-DBS lead with a conventional CC lead.
• To assess the impact of lead placement and orientation on stimulation outcomes.

Main Methods:

• Finite element electric field modeling combined with multicompartment neuron and axon models.
• Simulations represented internal capsule (IC) fibers and subthalamic nucleus (STN) cells.
• Defined optimal stimulation as maximal STN cell activation without IC fiber activation.

Main Results:

• The steering-DBS lead significantly increased STN cell activation compared to the CC lead in most scenarios.
• This improvement was observed with both single-contact and two-contact current steering protocols.
• Accurate lead placement and orientation were critical for achieving optimal stimulation.

Conclusions:

• The steering-DBS lead design shows promise for enhancing therapeutic outcomes in DBS.
• Lead orientation is a key factor in avoiding side effects from stimulating internal capsule fibers.
• Clinical trials should prioritize precise implantation orientation for steering-DBS leads.