This has been a long standing fantasy of mine. I have done gyn exams and love them. but the idea behind a lab, with tests and experiments being done on me, takes it to a whole different level of excitement and wonder. I would think that any med equipment used in regular gyno play, with the addition of some standard BDSM equipment for sensation testing, stamina, size, ability to stretch, hold, contain, retain, endure ...you get the idea.
For me the thing that makes this sort of scenario particularly enticing is the different element of the unknown. While in a gyno exam the focus is on finding out what is wrong and helping the patient, in spite of possible embarrassment, discomfort, etc, the focus in the lab is to learn something. I am not a "patient" but a "subject". As such there is an unspoken...or spoken when necessary...intent to pursue information regardless of the effects on the subject. The subjects wants, desires, and needs are secondary to the pursuit of knowledge. This may include the pursuit of learning which tools produce what sort of outcome, or what capacity a subject's body is capable of... however it plays out the doctor-researcher is less touchy-feely in a gentle sense with the subject. That level of detachment is entriguing to me.
I have not yet experienced this sort of play but find it to be very enticing in my imagination. Of course, in real life, were this to be played out, there would be the necessary safe words, the pre-play prep to understand what is really wanted, and there would always be a play doc who is concerned about creating exciting sensual erotic sensation for the "subject". Isn't that what it is all about? In return the doc gets his own delights out of the extreme power exchange in the play, as well as being able to observe the results of his handicraft.