Yes, there are digital electronic stethoscopes that can be used by people with hearing impairments.
For example, the ViScope ™, amplifies sounds 30 times louder than an acoustic scope and provides a visual display of the phonocardiogram or phonopneumogram. The ViScope™ is intended for use with In-the-Ear (ITE) and "open fit" Behind-the-Ear (BTE) type hearing aids. Some models are supplied without headphones allowing the user to choose the appropriate listening device to meet their specific needs.
-  ViScope