noun, noun which may take the genitive case particle 'no'
intravascular; inside a blood vessel
Medical and biological term. Often used attributively with の, as in 血管内の (intravascular).
Intravascular treatment is a minimally invasive method.
The pressure inside the blood vessel is rising.
Compound of 血管 (blood vessel) + 内 (inside). The reading けっかんない follows standard on'yomi.