Assertion: inner cannula | /r/AtLocation | situ
Facets:
value: for a breathing circuit
type: PURPOSE
Source sentences:
text: It is important to know that some tracheostomy tubes (for example, Shiley™ tubes) need the inner cannula to be in-situ for a breathing circuit to be attached, whereas others (for example, Portex™ tubes) can be attached can be attached to the circuit with or without the inner cannula in place.