Spencer Technologies, Inc. Transcranial Doppler Ultrasound System with 2 MHz Transducer: TCD 100M Digital Transcranial Doppler Ultrasound System & PMD 100 Digital Transcranial Doppler Ultrasound System (these systems are the same hardware and software - the change from TCD 100M to PMD 100 is a marketing change). Software version 1.3.0 Model numbers 10119, 10863, 10919, 10968, 11016, 11052, 11090, 11091, 11235, 11236 Recall
Check Your Product
According to the U.S. Food and Drug Administration (FDA)
Product
Transcranial Doppler Ultrasound System with 2 MHz Transducer: TCD 100M Digital Transcranial Doppler Ultrasound System & PMD 100 Digital Transcranial Doppler Ultrasound System (these systems are the same hardware and software - the change from TCD 100M to PMD 100 is a marketing change). Software version 1.3.0 Model numbers 10119, 10863, 10919, 10968, 11016, 11052, 11090, 11091, 11235, 11236
Brand
Spencer Technologies, Inc.
Lot Codes / Batch Numbers
Serial numbers 0001-0016, 0018-0035, 0037-0043, 0045-0048, 0050-0060, 0062-0064, 0066-0080, 0082-0157
Products Sold
Serial numbers 0001-0016, 0018-0035, 0037-0043, 0045-0048, 0050-0060, 0062-0064, 0066-0080, 0082-0157
Spencer Technologies, Inc. is recalling Transcranial Doppler Ultrasound System with 2 MHz Transducer: TCD 100M Digital Transcranial Doppler due to Potential for saved blood flow velocity values to not agree with actual velocity values as shown on the spectrogram axis.. Based on FDA medical device recall database.
Summary derived from FDA notice
Reason for Recall
As stated by FDA
Potential for saved blood flow velocity values to not agree with actual velocity values as shown on the spectrogram axis.
Recommended Action
Per FDA guidance
Beginning on 2/19/04 the firm sent a letter dated 2/17/04 to customers via US Mail. The letter describes the malfunctions, how to avoid the malfunction and advises the customer they will be receiving a software upgrade which will resolve the problem.
Verify this information on the official source
For complete details and official instructions, check the U.S. Food and Drug Administration (FDA) directly.
View official FDA recall noticePage updated: Jan 10, 2026