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what is your purpose for the ultrasonic knife?
generally speaking, most of such device aiming at minimizing tissue injury and/or bleeding. you can start with skin, for sure.
If you have special issue of concern, for example, you want to see if ultrasound is good for cartilage cutting, or you want to aim at specific tissue, such as liver or nerve, you should design your experiment accordingly.
EM is not your first choice at the very beginning. you will need to do light microscopy. I give you an example for you to get a better understanding: if you want to kill a mosquito, can you do it with a bomb? you know, maybe you can, maybe not. But you should try smaller weapon, handy weapon first, right? maybe your hands are better.
This do nothing with the 'effect' as you mentioned, this is a question of what are you looking for.
wish you all the best. If you really want to do something in this area, you need to read some papers first. try to find some papers in regenerative medicine or histology journals. good luck.
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