A medical needle shield apparatus is provided that includes a first housing configured
to actuate a needle cannula. A second housing is releasably engageable with the
first housing. The needle cannula is disposed for slidable movement with the second
housing such that the second housing is extensible from a retracted position to
an extended position to enclose a distal end of the needle cannula. The second
housing includes a binding member that defines binding surfaces that form an aperture
configured for slidable receipt of the needle cannula. The binding member includes
a drag inducing member that engages the needle cannula during slidable receipt
of the needle cannula to create a drag force. The drag force and second housing
facilitate rotation of the binding member relative to a longitudinal axis of the
needle cannula such that the binding surfaces engage the needle cannula to prevent
slidable movement of the needle cannula.