201414168902 A description the present invention relates to an intelligent intravenous apparatus and method for guiding and detecting proper insertion of a cannula tip of a catheter into a vein for infusion of intravenous iv fluids and further monitoring and sensing when a withdrawal of the cannula tip from the vein occurs b braun intrusion safety iv catheter is an example of a catheter that is capable of being modified to incorporate the features of the present invention various embodiments of the invention are contemplated one embodiment is illustrated in fig1 a 1d a second embodiment is illustrated in fig2 a and 2b a third embodiment is illustrated in fig3 a 3c a fourth embodiment is illustrated in fig5 a 5b 6 7a 7b and 8 in all illustrated embodiments the cannula includes one or more sensors that provide signals indicating whether or not the cannula tip is properly inserted within a patient 39 s vein or properly withdrawn therefrom to avoid medical complications with infusate the broad principles of the invention are applicable to dc ac and acoustical sensors with wires or wireless connections to electronic or electrical sensing module having signal processing and modulation electronics therein attached to the patient or connected by either a hardwired connection or wirelessly back to a control panel and or base.