na-adjective
surgical; invasive; open
Medical term describing procedures that involve cutting into the body or entering a body cavity, as opposed to non-invasive or endoscopic methods.
観血的手術が必要だと医師に言われた。
The doctor told me that open surgery is necessary.
この治療は観血的な方法を避け、内視鏡で行います。
This treatment avoids invasive methods and is performed with an endoscope.
Also means invasive, but is a broader medical term that can refer to any procedure that stresses the body, not necessarily involving cutting.
Compound of 観血 (かんけつ, 'observing blood', from 観 'observe' and 血 'blood') + 的 (てき, '-like, -ic'). The term refers to procedures where blood is visible, i.e., open surgery.