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TMUX1112: Use TMUX1112 in medical applications

Coen Lauwerijssen
Prodigy 40 points
Part Number: TMUX1112
Other Parts Discussed in Thread: ADS1292R,

We want to use the TMUX1112 to switch the analog ECG signals (LA, RA, RL) of the ADS1292R. The TMUX is placed between the electrodes and the analog part of the ADS1292R. Is there reference to other designs  of using this switch in such configurations closely placed to a user from a medical product safety testing point of view? In case the TMUX1112 would fail/break there seems to be the possibility that a patient can get exposed to VDD or is there protection internally to prevent this from happening?

  • 0
    TI__Mastermind 43536 points

    Hi Coen,

    If  there was a failure which shorted an I/O to the VDD it would possibly expose the patient to a shock. However I am bit concerned because under failure conditions there are conditions where VDD could possibly show up on VDD. Is there a specific application scenario that you are worried may damage the part? We do have parts that should work well without worrying of possibly breakage, but I am not sure that without putting some other circuitry along with the mux that there is a surefire way to guarantee during failure a patient would not be shocked. 

    Please if you can let me know if there are any problem scenarios - even if it is just the signal levels during the problem events - any information helps. As the TMUX11xx line of parts are typically precision parts not protection parts so there may be a better part.

    Best,

    Parker Dodson

  • 0 in reply to Parker Dodson
    Prodigy 40 points

    Hi Parker,

    Your answer already clarified that the switch should not be used in the way we had in mind. For medical use any (highly unlikely) single fault condition leading to patient risk is to be avoided so we will for this application approach it more directly and not use this switch.

    Thanks!

    Coen