MAUDE Adverse Event Report: Nihon Kohden Corporation ZM-531PA; Telemetry Transmitter

Model Number	ZM-531PA
Medical Device Problem Codes	Unable to Obtain Readings (1516); Output Problem (3005)
Health Effect - Clinical Code	No Clinical Signs, Symptoms or Conditions (4582)
Date of Event	07/15/2026
Type of Reportable Event	Malfunction
Event or Problem Description
The biomedical engineer (biomed) reported that the ecg waveforms on the zm transmitter would display briefly and then disappear, similar to when the leads are disconnected.No patient harm was reported.
Additional Manufacturer Narrative
The biomedical engineer (biomed) reported that the ecg waveforms on the zm transmitter would display briefly and then disappear, similar to when the leads are disconnected.They had swapped out the lead wires and trunk cables, but the issue persisted.No patient harm was reported.Nihon kohden continues to investigate the reported event.Nihon kohden will submit a supplemental report in accordance with 21 cfr section 803.56 when additional information becomes available.

• Brand Name: ZM-531PA
• Common Device Name: Telemetry Transmitter
• Manufacturer (Section D): Nihon Kohden Corporation; attn: shama mooman; 1-31-4 nishiochia; shinjuku-ku, tokyo 161-8 560; JA 161-8560
• Manufacturer (Section G): Nihon Kohden Tomioka Corporation; attn: shama mooman; 1-1 tajino; tomioka city, gunma 370-2 314; JA 370-2314
• Manufacturer Contact: shama mooman ; seibu bldg 2, 4th floor 1-11-2; kusunokidai tokorozawa, saitama 359-8-580 ; JA 359-8580
• MDR Report Key: 50148272
• Report Number: 8030229-2026-06954
• Device Sequence Number: 21484567
• Product Code: DRT
• UDI-Device Identifier: 04931921115107
• UDI-Public: (01)04931921115107
• Combination Product (Y/N): N
• Initial Reporter State: ID
• Initial Reporter Country: US
• PMA/510(K) Number: K043517
• Number of Events Summarized: 1
• Summary Report (Y/N): N
• Serviced by Third Party (Y/N): N
• Reporter Type: Manufacturer
• Report Source: User Facility
• Initial Reporter Occupation: Biomedical Engineer
• Type of Report: Initial
• Report Date (Section B): 08/05/2026

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: ZM-531PA
• Device Catalogue Number: ZM-531PA
• Was Device Available for Evaluation?: No
• Is the Reporter a Health Professional?: No
• Type of Report(Section G): Thirty-Day
• Initial Date Received by Manufacturer: 07/15/2026
• Initial Report FDA Received Date: 08/05/2026
• Was Device Evaluated by Manufacturer? (Y/N): No
• Date Device Manufactured: 01/15/2019
• Is the Device Labeled for Single Use? (Y/N): No
• Is This a Single-Use Device that was Reprocessed and Reused on a Patient? (Y/N): No
• Usage of Device: Reuse
• Patient Sequence Number: 1
• Patient Sex: Unknown