Assertion: groshong catheter | /r/HasAspect | valve
Facets:
value: at the tip
type: LOCATION
Source sentences:
text: The Groshong catheters have a valve at the tip, preventing blood from backing up into the catheter, so heparin is not necessary.
text: The Groshong catheters have a valve at the tip, tend to be lighter and more flexible and don't require a bulky clamp.