Failure modes of spinal cord stimulation hardware

Area of Science:

• Neurosurgery
• Pain Management
• Biomedical Engineering

Background:

• Epidural spinal cord stimulation (SCS) is a recognized treatment for refractory pain.
• The failure modes of implanted SCS hardware are not extensively documented.
• Analyzing hardware failures can inform improvements in SCS procedures and device design.

Purpose of the Study:

• To investigate the failure modes of implanted spinal cord stimulation hardware.
• To identify factors influencing hardware failure rates and types.
• To provide data for refining surgical techniques and designing next-generation SCS devices.

Main Methods:

• Retrospective review of electronic charts and operative reports for 289 patients undergoing SCS implantation (1998-2002).
• Data collection included demographics, hardware type, implantation details, failure time, and failure mode.
• Statistical analysis, including three-way ANOVA, was used to identify significant differences in failure rates based on location and type.

Main Results:

• 43.5% of 577 procedures involved SCS hardware revision or removal.
• Percutaneous leads (80% of total) were more durable than laminotomy leads, which broke twice as often.
• Hardware revision was needed in 46% of patients; thoracic leads had higher infection rates than cervical leads.

Conclusions:

• Spinal cord stimulation hardware failures are frequent, necessitating revisions in a significant patient subset.
• Lead type and placement location influence failure modes and rates.
• Findings support refining surgical techniques and enhancing the design of future SCS hardware for improved reliability.