My suggestion is that you should not think you must show a medical equipment in the logo. Also try many different combination of think in the logo concept including the image the company is trying to portray.

Nice simple font and a capsule icon on the left.
Well simple, 2 colour, red and white for icon and type.
Easy peasy

open a content on DP forum with about $20 bonus - you will get a lot of quality designs...

I guess to try keep the colours is the most important atribute.
Going with medical istruments is not really neccesary, although an imagage that complies with the logo will be suitable.