Google's John Mueller said in the Friday webmaster hangout said that "especially for medical topics, anything that's a little bit more critical" Google is more selective and critical over. He said he would see an "medical e-commerce site kind of falling into that category."
In short, Google will apply a higher level of scrutiny on sites with medical information, including e-commerce sites that sell medical equipment, when deciding where to rank that site. You need more signals of E-A-T (whatever that might mean) when trying to rank for medical queries – be it informational or transactional.
John said this at the 20:47 mark into the video, he said:
Especially for medical topics, anything that's a little bit more critical. I would also keep in mind everything around the so-called EAT, so the expertise, authoritativeness, trustworthiness. And to kind of make sure that the site that you're providing represents like a really high standard and that the content is of really high quality …