What would most likely not exist without biomedical engineering

Answer 1

What about digital hearing aids? That is engineering.

Answer 2

Another (because I know the engineer who got the original patent) is when you get a eye exam, the device which shoots a poof of air at your eye, and recordes the bounce off as internal eye perssure...https://www.glaucoma.org/gleams/high-eye-pressure-and-glaucoma.php