MAUDE Adverse Event Report: AOMORI OLYMPUS CO., LTD. THUNDERBEAT 5 MM, 35 CM, FRONT-ACTUATED GRIP TYPE S; ULTRASONIC SURGICAL DEVICE

Model Number	TB-0535FCS
Medical Device Problem Code	Naturally Worn (2988)
Health Effect - Clinical Code	No Clinical Signs, Symptoms or Conditions (4582)
Date of Event	11/19/2025
Type of Reportable Event	Malfunction
Event or Problem Description
It was reported by the customer that, during a therapeutic distal gastrectomy procedure, a short circuit error was displayed on the thunderbeat energy device.During device evaluation, a reportable malfunction was identified: the tissue pad was worn away.The intended procedure was completed using an olympus backup device.There was no report of patient injury or harm associated with this event.
Additional Manufacturer Narrative
The device was returned to olympus for inspection.Based on the results of the investigation, the following likely led to the malfunction: past investigation findings indicate that the grasping section was closed without grasping any tissue, including after tissue resection, while the output was activated in seal & cut mode, leading to wear of the tissue pad.The most probable cause of the complaint is cause not established, which indicates that the investigation findings do not lead to a clear conclusion about the cause of the reported adverse event.Should additional relevant information become available, a supplemental report will be submitted.Olympus will continue to monitor field performance for this device.

• Brand Name: THUNDERBEAT 5 MM, 35 CM, FRONT-ACTUATED GRIP TYPE S
• Common Device Name: ULTRASONIC SURGICAL DEVICE
• Manufacturer (Section D): AOMORI OLYMPUS CO., LTD.; 2-248-1 okkonoki; kuroishi-shi, aomori 036-0 357; JA 036-0357
• Manufacturer (Section G): AOMORI OLYMPUS CO., LTD.; 2-248-1 okkonoki; kuroishi-shi, aomori 036-0 357; JA 036-0357
• Manufacturer Contact: todd brill ; 800 west park drive; westborough, MA 01581 ; 5082077661
• MDR Report Key: 25770771
• Report Number: 9614641-2026-00739
• Device Sequence Number: 10538087
• Product Code: GEI
• UDI-Device Identifier: 04953170383557
• UDI-Public: 04953170383557
• Combination Product (Y/N): N
• Initial Reporter Country: KS
• PMA/510(K) Number: K211838
• Number of Events Summarized: 1
• Summary Report (Y/N): N
• Serviced by Third Party (Y/N): N
• Reporter Type: Manufacturer
• Report Source: Other
• Initial Reporter Occupation: Non-Healthcare Professional
• Type of Report: Initial
• Report Date (Section B): 07/09/2026

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: TB-0535FCS
• Device Lot Number: 55K30
• Date Returned to Manufacturer: 06/30/2026
• Is the Reporter a Health Professional?: No
• Was the Report Sent to FDA?: No
• Type of Report(Section G): Initial
• Initial Date Received by Manufacturer: 07/08/2026
• Initial Report FDA Received Date: 07/09/2026
• Was Device Evaluated by Manufacturer? (Y/N): Yes
• Date Device Manufactured: 05/30/2025
• 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): Yes
• Usage of Device: Initial
• Patient Sequence Number: 1
• Patient Sex: Unknown