PARADIGM® REAL-time MMT-722NAB (UDI 00613994402042)Recalls & reported problems

Summary

The FDA's MAUDE database contains 50 adverse event reports that list this exact device (DI 00613994402042), received between Jun 12, 2017 and Jul 6, 2020 — classified as 11 injuries, 39 malfunctions.

The most frequently reported specific device problem is “Device Displays Incorrect Message” (10 reports).

14 other recalls cover devices cleared under the same FDA submission (P980022); they may or may not involve this specific model.

Reports come from manufacturers, hospitals and patients and are not verified by the FDA. A report does not prove the device caused the event, and counts can't be used to compare devices or estimate failure rates. What reports can and can't tell you · How this data works · Data updated Oct 18, 2026.

Most reported problems

Recent adverse event reports

The 25 most recent of 50 reports, in the reporter's own words as published by the FDA.

• MalfunctionJul 6, 2020Premature Discharge of Battery; Device Difficult to Program or Calibrate; Premature Discharge of Battery; Device Difficult to Program or Calibrate

  INFORMATION RECEIVED BY MEDTRONIC INDICATED THAT THE INSULIN PUMP HAD A PUMP ERROR ALARM. CUSTOMER WAS ASSISTED WITH CLEARING THE ALARM. CUSTOMER WAS UNABLE TO CLEAR THE ALARM. CUSTOMER STATED THAT INSULIN PUMP ERROR ALARM RECURRED AFTER A BATTERY CHANGE. INSULIN PUMP'S ACT AND ESCAPE BUTTONS WERE NOT RESPONDING. NO HARM REQUIRING MEDICAL INTERVENTION WAS REPORTED. THE DEVICE WILL BE RETURNED FOR ANALYSIS.

  Patient problems: No Consequences Or Impact To Patient

  MAUDE report 10232875 ↗
• MalfunctionMay 19, 2020Computer Software Problem; Mechanical Problem; Device Difficult to Program or Calibrate; Battery Problem; Patient Device Interaction Problem; Priming Problem; Computer Software Problem; Mechanical Problem; Device Difficult to Program or Calibrate; Battery Problem; Patient Device Interaction Problem; Priming Problem

  INFORMATION RECEIVED BY MEDTRONIC INDICATED THAT THE INSULIN PUMP HAD BUTTON ERROR. CUSTOMER REPORTED THAT INSULIN PUMP HAD DIMINISHED BATTERY LIFE FROM FIRST DAY, DAMAGE TO THE CASING OF INSULIN PUMP, HAD TO REWOUND ONCE AND WAS SLOWER. NO HARM REQUIRING MEDICAL INTERVENTION WAS REPORTED. THE INSULIN PUMP WILL NOT BE RETURNED FOR ANALYSIS.

  Patient problems: No Consequences Or Impact To Patient

  MAUDE report 10069402 ↗
• MalfunctionMar 27, 2020Failure to Cycle; No Apparent Adverse Event; Failure to Cycle; No Apparent Adverse Event

  INFORMATION RECEIVED BY MEDTRONIC INDICATED THAT THE INSULIN PUMP HAD A COMPROMISED FORCE SENSOR SYSTEM ALARM. THE CUSTOMER STATED WHEN INSERTS SET AND RESERVOIR IN TO PRIME IT SHOOTS OUT INSULIN. THE DEVICE WAS NOT BUMPED OR DROPPED PRIOR TO THE ALARM AND THE DRIVE SUPPORT CAP APPEARED STICKING OUT. NO HARM REQUIRING MEDICAL INTERVENTION WAS REPORTED. THE INSULIN PUMP WILL BE RETURNED FOR ANALYSIS.

  Patient problems: No Consequences Or Impact To Patient

  MAUDE report 9887419 ↗
• MalfunctionFeb 17, 2020Failure to Cycle; Detachment of Device or Device Component; Failure to Cycle; Detachment of Device or Device Component

  INFORMATION RECEIVED BY MEDTRONIC INDICATED THAT THE INSULIN PUMP HAD A COMPROMISED FORCE SENSOR SYSTEM ALARM. IT WAS REPORTED THAT DRIVE SUPPORT CAP WAS FLUSHED. TROUBLESHOOTING WAS PERFORMED. NO HARM REQUIRING MEDICAL INTERVENTION WAS REPORTED. THE INSULIN PUMP WILL BE RETURNED FOR ANALYSIS.

  Patient problems: No Consequences Or Impact To Patient

  MAUDE report 9716316 ↗
• MalfunctionFeb 6, 2020Computer Software Problem; Computer Software Problem

  INFORMATION RECEIVED BY MEDTRONIC INDICATED THAT THE INSULIN PUMP HAD RANDOM UNKNOWN ALARMS. CUSTOMER DECLINED TO REPORT 24 HOURS TECHNICAL SUPPORT DEPARTMENT. NO HARM REQUIRING MEDICAL INTERVENTION WAS REPORTED. THE INSULIN PUMP WILL NOT BE RETURNED FOR ANALYSIS.

  Patient problems: No Consequences Or Impact To Patient

  MAUDE report 9674952 ↗
• MalfunctionJan 24, 2020Mechanical Problem; Mechanical Problem

  INFORMATION RECEIVED BY MEDTRONIC INDICATED THAT THE INSULIN PUMP HAD MOTOR ERROR AND UNEXPLAINED NO DELIVERY. NO HARM REQUIRING MEDICAL INTERVENTION WAS REPORTED. THE INSULIN PUMP WILL NOT BE RETURNED FOR ANALYSIS.

  Patient problems: No Consequences Or Impact To Patient

  MAUDE report 9625805 ↗
• MalfunctionNov 22, 2019Device Difficult to Program or Calibrate; Obstruction of Flow; Power Problem; Patient Device Interaction Problem; Device Difficult to Program or Calibrate; Obstruction of Flow; Power Problem; Patient Device Interaction Problem

  THE CUSTOMER REPORTED VIA PHONE CALL THAT THE INSULIN PUMP BUTTONS WERE HARDER TO PUSH. THE CUSTOMER¿S BLOOD GLUCOSE LEVEL WAS UNKNOWN AT THE TIME OF THE INCIDENT. CUSTOMER WAS ADVISED TO OBSERVE TIME CLOCK FOR ONE MINUTE TO VERIFY IF TIME ADVANCES AND THEY STATED THAT THE TIME WAS ADVANCES. THE CUSTOMER WAS ADVISED TO DISCONTINUE USE OF THE INSULIN PUMP AND TO REVERT TO THE BACK-UP PLAN. THE INSULIN PUMP WILL BE RETURNED FOR ANALYSIS.

  Patient problems: No Consequences Or Impact To Patient

  MAUDE report 9360493 ↗
• MalfunctionNov 5, 2019Insufficient Device Problem Information; Priming Problem; Insufficient Device Problem Information; Priming Problem

  CUSTOMER REPORTED VIA PHONE CALL THAT THE INSULIN PUMP STOPPED WORKING. CUSTOMER'S BLOOD GLUCOSE LEVEL WAS UNKNOWN. CUSTOMER STATED DURING PUMP PRIMING THE PLUNGER PUSHED ALL OF THE INSULIN OUT OF THE RESERVOIR AND GAVE AN UNSPECIFIED ERROR CODE ENDING IN 36. THE DEVICE WILL NOT BE RETURNED FOR ANALYSIS.

  Patient problems: No Consequences Or Impact To Patient

  MAUDE report 9282020 ↗
• MalfunctionOct 9, 2019Mechanical Problem; Obstruction of Flow; Mechanical Problem; Obstruction of Flow

  THE CUSTOMER REPORTED VIA PHONE CALL THAT THE INSULIN PUMP HAD MOTOR ERROR ALARM. THE BLOOD GLUCOSE WAS UNKNOWN. IT WAS REPORTED THAT INSULIN PUMP HAD NO DELIVERY ALARM AND REWOUND WOULD NOT WORK. THE DEVICE WILL NOT BE RETURNED FOR THE ANALYSIS.

  Patient problems: No Consequences Or Impact To Patient

  MAUDE report 9170521 ↗
• MalfunctionSep 4, 2019Mechanical Problem; Mechanical Problem

  THE CUSTOMER REPORTED VIA PHONE THAT THE INSULIN PUMP HAD MOTOR ERROR ALARM. CUSTOMER¿S BLOOD GLUCOSE WAS 300 MG/DL AT THE TIME OF INCIDENT. THE INSULIN PUMP PASSED DISPLACEMENT TEST. THE INSULIN PUMP WAS RETURNED FOR ANALYSIS.

  Patient problems: Hyperglycemia

  MAUDE report 8958776 ↗
• MalfunctionAug 21, 2019No Apparent Adverse Event; No Apparent Adverse Event

  THE CUSTOMER'S SPOUSE REPORTED VIA PHONE CALL THAT THE PRODUCT RETURN FOR AN UNKNOWN REASON. THE CUSTOMER¿S BLOOD GLUCOSE LEVEL WAS 388 MG/DL. THE INSULIN PUMP WILL RETURN FOR ANALYSIS.

  Patient problems: No Consequences Or Impact To Patient

  MAUDE report 8919190 ↗
• MalfunctionAug 16, 2019Device Difficult to Program or Calibrate; Moisture or Humidity Problem; Device Difficult to Program or Calibrate; Moisture or Humidity Problem

  THE CUSTOMER REPORTED VIA PHONE CALL THAT THEIR INSULIN PUMP HAD BUTTON ERROR ALARM OR BUTTONS NOT RESPONDING. THE CUSTOMER¿S BLOOD GLUCOSE LEVEL WAS UNKNOWN AT THE TIME OF THE INCIDENT. THE CUSTOMER WAS ADVISED TO DISCONTINUE USE OF THE INSULIN PUMP AND TO REVERT TO THE BACK-UP PLAN. THE DEVICE WILL BE RETURNED FOR ANALYSIS.

  Patient problems: No Consequences Or Impact To Patient

  MAUDE report 8900879 ↗
• MalfunctionAug 5, 2019Failure to Cycle; Detachment of Device or Device Component; Failure to Cycle; Detachment of Device or Device Component

  THE CUSTOMER REPORTED VIA PHONE CALL THAT THE INSULIN PUMP ALARMED COMPROMISED FORCE SENSOR SYSTEM. THE CUSTOMER¿S BLOOD GLUCOSE LEVEL WAS UNKNOWN AT THE TIME OF THE INCIDENT. THE CUSTOMER STATED THAT THE DRIVE SUPPORT CAP WAS PROTRUDED LOOSE. THE CUSTOMER WAS ADVISED THAT THE INSULIN PUMP NEEDED TO BE REPLACED AND WAS ADVISED TO DISCONTINUE USE OF THE INSULIN PUMP AND TO REVERT TO THE BACKUP PLAN. THE INSULIN PUMP WILL BE RETURNED FOR ANALYSIS.

  Patient problems: No Consequences Or Impact To Patient

  MAUDE report 8858524 ↗
• InjuryJul 31, 2019Adverse Event Without Identified Device or Use Problem; Adverse Event Without Identified Device or Use Problem

  CUSTOMER'S SPOUSE CALLED AND REPORTED THAT THEY EXPERIENCED LOW BLOOD GLUCOSE WITH BLOOD GLUCOSE OF 21 MG/DL AT THE TIME OF THE INCIDENT. THE CUSTOMER DID NOT MENTION HOW THEY WERE TREATED. THE CUSTOMER DID NOT MENTION ANY SYMPTOMS. THE CUSTOMER WAS WEARING THE INSULIN PUMP DURING THE INCIDENT. THE CUSTOMER STATED THEIR METER WAS NOT READING CORRECTLY AND THAT CAUSED THE CUSTOMER TO TAKE TOO MUCH INSULIN AND GOING LOW. TROUBLESHOOTING WAS NOT COMPLETED AS THE CUSTOMER DECLINED. THE CUSTOMER STATED THAT CARELINK WAS NOT RECORDING ANY INFORMATION SINCE (B)(6) 2019. THE INSULIN PUMP WILL BE RETURNED FOR ANALYSIS.

  Patient problems: Hypoglycemia

  MAUDE report 8845164 ↗
• MalfunctionJun 19, 2019Mechanical Problem; Patient Device Interaction Problem; Mechanical Problem; Patient Device Interaction Problem

  THE CUSTOMER REPORTED VIA PHONE CALL THAT THE INSULIN PUMP HAD MOTOR ERROR. THE CUSTOMER¿S BLOOD GLUCOSE LEVEL WAS UNKNOWN. THE CUSTOMER STATED THAT RESERVOIR LIP RING WAS NOT DAMAGED. THE CUSTOMER WAS DECLINED TROUBLESHOOTING FOR MOTOR ERROR. THE CUSTOMER WAS ADVISED THAT THE INSULIN PUMP NEEDED TO BE REPLACED AND WAS ADVISED TO DISCONTINUE USE OF THE INSULIN PUMP AND TO REVERT TO THE BACKUP PLAN. THE INSULIN PUMP WILL BE RETURNED FOR ANALYSIS.

  Patient problems: No Consequences Or Impact To Patient

  MAUDE report 8711310 ↗
• MalfunctionMay 22, 2019Failure to Cycle; Priming Problem; Failure to Cycle; Priming Problem

  IT WAS REPORTED THAT THE INSULIN PUMP ALARMED COMPROMISED FORCE SENSOR SYSTEM AND THE PISTON DID NOT STOP AND INSULIN SQUIRTED OUT. THE CUSTOMER¿S BLOOD GLUCOSE LEVEL WAS 120 MG/DL AT THE TIME OF THE INCIDENT. CUSTOMER SAID THAT PISTON DID NOT STOP. THE CUSTOMER WAS ADVISED THAT THE INSULIN PUMP NEEDED TO BE REPLACED AND WAS ADVISED TO DISCONTINUE USE OF THE INSULIN PUMP AND TO REVERT TO THE BACKUP PLAN. THE INSULIN PUMP WILL NOT BE RETURNED FOR ANALYSIS.

  Patient problems: No Consequences Or Impact To Patient

  MAUDE report 8631463 ↗
• MalfunctionMay 13, 2019No Display/Image; Display or Visual Feedback Problem; No Display/Image; Display or Visual Feedback Problem

  THE CUSTOMER REPORTED VIA PHONE CALL THAT THE INSULIN PUMP WAS NOT TURNING ON ANYMORE. THE CUSTOMER¿S BLOOD GLUCOSE LEVEL WAS 168 MG/DL AT THE TIME OF THE INCIDENT. CUSTOMER STATES THE INSULIN PUMP WAS NEITHER EXPOSED TO EXTREME TEMPERATURES NOR DIRECT SUNLIGHT. THE INSULIN PUMP WILL BE RETURNED FOR ANALYSIS.

  Patient problems: No Consequences Or Impact To Patient

  MAUDE report 8602702 ↗
• MalfunctionMay 1, 2019Device Alarm System; Mechanical Problem; Obstruction of Flow; Battery Problem; Communication or Transmission Problem; Priming Problem; Device Alarm System; Mechanical Problem; Obstruction of Flow; Battery Problem; Communication or Transmission Problem; Priming Problem

  THE CUSTOMER REPORTED VIA PHONE CALL THAT THE INSULIN PUMP HAD AUDIO ANOMALY. CUSTOMER'S BLOOD GLUCOSE VALUE WAS UNKNOWN AT THE TIME OF THE INCIDENT. THE CUSTOMER WAS ASSISTED WITH TROUBLESHOOTING. THE CUSTOMER STATED THAT THEY CANNOT HEAR THE LONGER ALARMS. THE DEVICE WILL NOT BE RETURN FOR ANALYSIS.

  Patient problems: No Consequences Or Impact To Patient

  MAUDE report 8568113 ↗
• MalfunctionMay 1, 2019Failure to Cycle; Detachment of Device or Device Component; Failure to Cycle; Detachment of Device or Device Component

  THE CUSTOMER REPORTED VIA PHONE CALL THAT THE INSULIN PUMP ALARMED COMPROMISED FORCE SENSOR SYSTEM DURING REWINDING. THE CUSTOMER¿S BLOOD GLUCOSE LEVEL WAS 220 MG/DL. CUSTOMER STATED THAT THE DRIVE SUPPORT CAP WAS STICKING OUT. CUSTOMER WAS ASSISTED WITH TROUBLESHOOTING AND REPORTED THAT INSULIN WAS SQUIRTED DURING MANUAL PRIME PROCESS. THE CUSTOMER WAS ADVISED THAT THE INSULIN PUMP NEED TO BE REPLACED AND WAS ADVISED TO DISCONTINUE USE OF THE INSULIN PUMP AND TO REVERT TO THE BACKUP PLAN. THE INSULIN PUMP WILL BE RETURNED FOR ANALYSIS.

  Patient problems: No Consequences Or Impact To Patient

  MAUDE report 8567778 ↗
• MalfunctionApr 5, 2019Display or Visual Feedback Problem; Obstruction of Flow; Battery Problem; Power Problem; Patient Device Interaction Problem; Display or Visual Feedback Problem; Obstruction of Flow; Battery Problem; Power Problem; Patient Device Interaction Problem

  THE CUSTOMER REPORTED VIA PHONE CALL THAT THE RAINBOW EFFECT IN SUNLIGHT AND IT EFFECT ON VISIBILITY. THE CUSTOMER¿S BLOOD GLUCOSE LEVEL WAS UNKNOWN. THE CUSTOMER STATED THAT INSULIN PUMP REJECTED THE BATTERY, CRACK IN RESERVOIR OPENING AND INSULIN PUMP GIVES THE NO DELIVERY ALARM. THE DEVICE WILL NOT BE RETURNED FOR THE ANALYSIS.

  Patient problems: No Consequences Or Impact To Patient

  MAUDE report 8486094 ↗
• MalfunctionMar 22, 2019Device Difficult to Program or Calibrate; Obstruction of Flow; Battery Problem; Patient Device Interaction Problem; Device Difficult to Program or Calibrate; Obstruction of Flow; Battery Problem; Patient Device Interaction Problem

  THE CUSTOMER REPORTED VIA PHONE CALL THAT THE INSULIN PUMP HAD KEYPAD ANOMALY. THE CUSTOMER'S BLOOD GLUCOSE LEVEL WAS UNKNOWN AT THE TIME OF INCIDENT. CUSTOMER STATED THAT THE BUTTON OF THE INSULIN PUMP ARE HARDER AND STICKY ALSO UNRESPONSIVE SOMETIMES. CUSTOMER ALSO STATED THAT THE INSULIN PUMP HAD DIMINISHED BATTERY LIFE AND UNEXPLAINED NO DELIVERY ALERTS. ADVISED THE INSULIN PUMP WILL NEED TO BE REPLACED AND TO DISCONTINUE USE OF THE INSULIN PUMP AND REVERT TO A BACK-UP PLAN. THE INSULIN PUMP WILL NOT BE RETURNED FOR ANALYSIS.

  Patient problems: No Consequences Or Impact To Patient

  MAUDE report 8442916 ↗
• MalfunctionMar 21, 2019Material Integrity Problem; Adverse Event Without Identified Device or Use Problem; Power Problem; Material Integrity Problem; Adverse Event Without Identified Device or Use Problem; Power Problem

  THE CUSTOMER'S MOTHER REPORTED VIA PHONE CALL THAT THE INSULIN PUMP HAD FAILURE. THE CUSTOMER¿S BLOOD GLUCOSE VALUE WAS 200 MG/DL AT THE TIME OF INCIDENT. THE CUSTOMER'S MOTHER WAS ASSISTED WITH TROUBLESHOOTING. THE CUSTOMER'S MOTHER WAS REPORTED THAT THE BATTERY CAP PIECES WERE BROKEN. THE INSULIN PUMP WILL NOT BE RETURNED FOR ANALYSIS.

  Patient problems: No Consequences Or Impact To Patient

  MAUDE report 8439127 ↗
• MalfunctionMar 19, 2019Date/Time-Related Software Problem; Patient Device Interaction Problem; Date/Time-Related Software Problem; Patient Device Interaction Problem

  CUSTOMER REPORTED VIA PHONE CALL THAT THE AFTER BATTERY GETS CHANGED OUT IT LOSES THE DATE AND TIME. CUSTOMER BLOOD GLUCOSE LEVEL WAS UNKNOWN. CUSTOMER ALSO STATED THAT THE BATTERY HOUSING HAS CHIPPING AND CRACK ON BOTH SIDES OF BATTERY HOUSING. THE DEVICE WILL BE RETURNED FOR ANALYSIS.

  Patient problems: No Consequences Or Impact To Patient

  MAUDE report 8431361 ↗
• InjuryMar 1, 2019Mechanical Problem; Insufficient Device Problem Information; Priming Problem; Mechanical Problem; Insufficient Device Problem Information; Priming Problem

  THE CUSTOMER REPORTED VIA PHONE CALL THAT THEY EXPERIENCED LOW BLOOD GLUCOSE. THE CUSTOMER¿S BLOOD GLUCOSE LEVEL WAS 25 MG/DL. CUSTOMER ALSO REPORTED THAT INSULIN WAS SQUIRT ON PRIME AND UNSPECIFIED ERROR WAS ALSO OCCURRED. THE INSULIN PUMP WILL NOT BE RETURNED FOR ANALYSIS.

  Patient problems: Hypoglycemia

  MAUDE report 8381301 ↗
• MalfunctionJan 16, 2019Failure to Cycle; Failure to Cycle

  THE CUSTOMER REPORTED VIA PHONE CALL THAT THE INSULIN PUMP ALARMED COMPROMISED FORCE SENSOR SYSTEM. THE CUSTOMER¿S BLOOD GLUCOSE LEVEL WAS 300 MG/DL AT THE TIME OF THE INCIDENT. CUSTOMER STATES INSULIN CONTINUES TO DRIP AFTER MOTOR STOPS DURING THE MANUAL PRIME PROCESS. CUSTOMER STATES THEY ARE UNABLE TO EXIT THE PREPARING TO PRIME LOOP. THE CUSTOMER WAS ADVISED THAT THE INSULIN PUMP NEEDED TO BE REPLACED AND WAS ADVISED TO DISCONTINUE USE OF THE INSULIN PUMP AND TO REVERT TO THE BACKUP PLAN. THE INSULIN PUMP WILL BE RETURNED FOR ANALYSIS.

  Patient problems: No Consequences Or Impact To Patient

  MAUDE report 8252191 ↗

Recalls under the same FDA submission

These recalls involve devices cleared under P980022. One submission often covers many models, so check the product and lot details in each record.

• Z-1749-2026 · Feb 13, 2026 · Open, Classified
  Paradigm REAL-Time Insulin Pump (MMT-522, MMT-722)
• Z-1750-2026 · Feb 13, 2026 · Open, Classified
  Paradigm REAL-Time Revel Insulin Pump (MMT-523, MMT-723)
• Z-1256-2025 · Jan 31, 2025 · Open, Classified
  Paradigm insulin pump, REF: MMT-522, MMT-523, MMT-551, MMT-722, MMT-723, MMT-751
• Z-1587-2020 · Jun 27, 2019 · Open, Classified
  Medtronic MiniMed Paradigm Insulin pump, model number MMT-522
• Z-1589-2020 · Jun 27, 2019 · Open, Classified
  Medtronic MiniMed Paradigm Insulin pump, model number MMT-522K
• Z-1593-2020 · Jun 27, 2019 · Open, Classified
  Medtronic MiniMed Paradigm Insulin pump, model number MMT-723K
• Z-1591-2020 · Jun 27, 2019 · Open, Classified
  Medtronic MiniMed Paradigm Insulin pump, model number MMT-523
• Z-1592-2020 · Jun 27, 2019 · Open, Classified
  Medtronic MiniMed Paradigm Insulin pump, model number MMT-523K
• Z-1588-2020 · Jun 27, 2019 · Open, Classified
  Medtronic MiniMed Paradigm Insulin pump, model number MMT-722
• Z-1594-2020 · Jun 27, 2019 · Open, Classified
  Medtronic MiniMed Paradigm Insulin pump, model number MMT-723
• Z-1590-2020 · Jun 27, 2019 · Open, Classified
  Medtronic MiniMed Paradigm Insulin pump, model number MMT-722K
• Z-2442-2015 · Jul 22, 2015 · Terminated
  Guardian Real-Time Monitor, Model No. CSS7100. Indicated for continuous or periodic monitoring of glucose levels in the fluid under the skin, in adults (18 years and older) with d
• Z-2179-2014 · Jul 21, 2014 · Terminated
  Medtronic MiniMed Guardian Monitor, Model No. CSS7100, CSS7100K Product Usage: The Medtronic MiniMed model CSS7100 and CSS7100K Guardian REAL-Time monitors are used in combinatio
• Z-2544-2014 · Mar 13, 2014 · Terminated
  Medtronic MiniMed Paradigm Insulin Infusion Pumps, Paradigm models: MMT-511, MMT-512, MMT-712, MMT-712E, MMT-515, MMT-715, MMT-522, MMT-522K, MMT-722, MMT-722K, MMT-523, MMT-523K