MAUDE Adverse Event Report: NUVASIVE SPECIALIZED ORTHOPEDICS, INC. PRECICE SCREWS; ROD, FIXATION, INTRAMEDULLARY AND ACCESSORIES

Model Number	STP4-400
Medical Device Problem Code	Corroded (1131)
Health Effect - Clinical Code	No Clinical Signs, Symptoms or Conditions (4582)
Date of Event	11/04/2021
Type of Reportable Event	Malfunction
Additional Manufacturer Narrative
The device has not been returned for evaluation.The root cause is unable to be determined at this time.If any additional information is provided, a supplemental report will be submitted.
Event or Problem Description
Information was received that upon explant the screw was noted to have corrosion.No patient adverse event was reported.
Additional Manufacturer Narrative
Device evaluation: upon return, visual inspection of the screw revealed the screw had visible evidence of discoloration.Utilizing external assessments and standard corrosion test methods (salt spray), our investigation has identified mechanically assisted crevice corrosion (macc) as the likely direct cause.The key element has been the mechanical micro-movement within the anti-rotation junction of the stryde devices due to the higher weight bearing potential as a result of a more mobile patient population.We have been able to replicate this in-vitro and have developed the mechanical parameters that drive the clinical variation in corrosion.In-vitro testing has shown a correlation between the load on the telescopic junction of the device and the degree of corrosion, with much less corrosion seen at lower loads.This helps explain why different levels of corrosion between patients as weight bearing protocols vary among surgeons.A root cause analysis was performed and found the risks associated with mechanically assisted crevice corrosion (macc) were not adequately identified and mitigated through the risk management/design control process.Device records review: review of the device history records indicated the screw was visually inspected and met all dimensional and quality inspections prior to release.
Event or Problem Description
No additional information was provided.

• Brand Name: PRECICE SCREWS
• Common Device Name: ROD, FIXATION, INTRAMEDULLARY AND ACCESSORIES
• Manufacturer (Section D): NUVASIVE SPECIALIZED ORTHOPEDICS, INC.; 101 enterprise dr, ste 100; aliso viejo CA 92656
• Manufacturer (Section G): NUVASIVE SPECIALIZED ORTHOPEDICS, INC.; 101 enterprise dr, ste 100; aliso viejo CA 92656
• Manufacturer Contact: geoff gannon ; 101 enterprise dr, ste 100; aliso viejo, CA 92656 ; 8583448112
• MDR Report Key: 12852092
• Report Number: 3006179046-2021-00499
• Device Sequence Number: 14698081
• Product Code: HSB
• UDI-Device Identifier: 00887517952394
• UDI-Public: 887517952394
• Combination Product (Y/N): N
• Initial Reporter Country: US
• PMA/510(K) Number: K193617
• Number of Events Summarized: 1
• Summary Report (Y/N): N
• Device Implanted Year: 2019
• Device Explanted Year: 2021
• Serviced by Third Party (Y/N): Unknown
• Reporter Type: Manufacturer
• Report Source: Foreign,Health Professional,Distributor
• Initial Reporter Occupation: Physician
• Type of Report: Initial,Followup
• Report Date (Section B): 12/07/2021

1 Device was Involved in the Event

1 Patient was Involved in the Event

• Is this an Adverse Event Report?: No
• Is this a Product Problem Report?: Yes
• Operator of Device: Health Professional
• Device Model Number: STP4-400
• Device Lot Number: 9011083
• Was Device Available for Evaluation?: Device Returned to Manufacturer
• Date Returned to Manufacturer: 11/19/2021
• Is the Reporter a Health Professional?: Yes
• Was the Report Sent to FDA?: No
• Type of Report(Section G): Thirty-Day
• Initial Date Received by Manufacturer: 11/04/2021
• Supplement Date Received by Manufacturer: 12/03/2021
• Initial Report FDA Received Date: 11/22/2021
• Supplement Report FDA Received Date: 12/07/2021
• Was Device Evaluated by Manufacturer? (Y/N): Yes
• Date Device Manufactured: 01/10/2019
• Is the Device Labeled for Single Use? (Y/N): Yes
• Is This a Single-Use Device that was Reprocessed and Reused on a Patient? (Y/N): No
• Usage of Device: Initial
• Patient Sequence Number: 1
• Patient Sex: Male