It is used in medical terms to indicate a procedure that involves crushing or breaking something, usually a stone or tissue.
Here are some examples:
* Lithotripsy: Crushing of a stone, usually in the kidney or bladder.
* Spleno-tripsy: Crushing of the spleen.
* Hysterotripsy: Crushing of the uterus.
So, in essence, "-tripsy" tells you that a medical procedure involves crushing or grinding something.