minimally invasive

or minimal invasive

adjective
  1. (of medical treatments or procedures) requiring only a small incision or the insertion of an instrument into a body cavity; involving minimal damage of body tissue: minimally invasive endoscopy.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for minimally invasive

minimally invasive

minimal invasive

adjective
  1. (of surgery) involving as little incision into the body as possible, through the use of techniques such as keyhole surgery and laser treatment
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012