Sherian Spradley filed a product liability lawsuit against Nevro Corporation and Globus Medical alleging that a spinal cord stimulator implanted in her body on June 28, 2023, was fundamentally different from the device originally approved by the FDA and caused serious neurological harm.
The complaint alleges that while Nevro's Senza spinal cord stimulator received FDA premarket approval in 2015, the device has since been altered through hundreds of PMA supplements that modified its battery chemistry, firmware, waveform control, leads, and user interface without new clinical safety validation. Spradley alleges these changes transformed the device's mechanism of action, performance characteristics, and risk profile.
Spradley, a Tennessee resident, alleges the device failed to perform as promised and instead caused painful neurologic symptoms, worsening pain, and potentially permanent injuries. The complaint alleges Nevro failed to adequately warn patients about risks including overstimulation of the vagus nerve that can lead to complications like dysmotility, syncope, arrhythmias and incontinence.
The case was filed in the Northern District of California, where Nevro was previously headquartered before being acquired by Pennsylvania-based Globus Medical on February 6, 2025. The complaint notes that Nevro still represents on its website that it is headquartered in Redwood City, California, despite formally changing its headquarters address.
Spradley seeks damages under California, Pennsylvania, and Tennessee law, with her attorney Jennifer Liakos of Liakos Law representing her in the case numbered 3:26-cv-03180.