ADUM4160BRIZ EMI

I am triing to find an alternative USB isolation for a medical application, as our ADUM4160BRIZ generate EMI issues (spurious emmision), despite carefull design (and use of application note0971 &1109). We are trying to find new product with low EMI features, or a alternative components that could be used instead of ADUM4160BRIZ ? Would ADUM3160 (without reinforced isolation) have less EMI that ADUM4160 ? other options ?

tks