A cannula device , comprising: a first housing defining a first throughbore aligned along a central axis; a plurality of elongate rigid members cooperatively defining a passage axially aligned with the first throughbore along the central axis; a second housing defining a second throughbore, the second housing moveable in an axial direction along the central axis with respect to the first housing, the plurality of elongate rigid members connected to the first housing by a first track including first inter-engaging parts that are slidable relative to one another, the second housing being operably connected to the elongate rigid members by a second track including second inter-engaging parts that are slidable relative to one another, the first track extending axially outward and diagonally with respect to the central axis such that axial movement of the second housing with respect to the first housing along the central axis causes the plurality of elongate rigid members to move away from each other and increase a size of the passage, wherein: the first inter-engaging parts comprise first guide grooves of the first housing and first tongue features on the plurality of elongate rigid members that slide within respective ones of the first guide grooves of the first housing, and the second inter-engaging parts comprise second guide grooves of the second housing and second tongue features on the plurality of elongate rigid members that slide within respective ones of the second guide grooves in the second housing to operably connect the elongate rigid members to the second housing. a first housing defining a first throughbore aligned along a central axis; a plurality of elongate rigid members cooperatively defining a passage axially aligned with the first throughbore along the central axis; a second housing defining a second throughbore, the second housing moveable in an axial direction along the central axis with respect to the first housing, the plurality of elongate rigid members connected to the first housing by a first track including first inter-engaging parts that are slidable relative to one another, the second housing being operably connected to the elongate rigid members by a second track including second inter-engaging parts that are slidable relative to one another, the first track extending axially outward and diagonally with respect to the central axis such that axial movement of the second housing with respect to the first housing along the central axis causes the plurality of elongate rigid members to move away from each other and increase a size of the passage, wherein: the first inter-engaging parts comprise first guide grooves of the first housing and first tongue features on the plurality of elongate rigid members that slide within respective ones of the first guide grooves of the first housing, and the second inter-engaging parts comprise second guide grooves of the second housing and second tongue features on the plurality of elongate rigid members that slide within respective ones of the second guide grooves in the second housing to operably connect the elongate rigid members to the second housing. the first inter-engaging parts comprise first guide grooves of the first housing and first tongue features on the plurality of elongate rigid members that slide within respective ones of the first guide grooves of the first housing, and the second inter-engaging parts comprise second guide grooves of the second housing and second tongue features on the plurality of elongate rigid members that slide within respective ones of the second guide grooves in the second housing to operably connect the elongate rigid members to the second housing. <EOS>