An intravenous catheter apparatus comprising: an integrated three-way stopcock assembly, and a catheter hub assembly having a proximal end configured to be connected to a needle hub having a needle, and having a distal end configured to be connected to a catheter tube, wherein a straight needle is capable of passing through said proximal end and distal end of the catheter hub assembly, in a ready position of the intravenous catheter apparatus, said catheter hub assembly includes: a wing housing at the distal end, a housing at the proximal end, and a body portion in between housing said three-way stopcock assembly; wherein said body portion comprises an entry port in communication with said housing, an exit port in communication with said wing housing, wherein the entry port and the exit port extend along a horizontal line in an axial direction, and an injection port, wherein all of these ports (44, 46, 48) are confluent at a central chamber configured within the body portion; wherein said three-way stopcock assembly has a top portion and an opposing bottom portion, both along a vertical line perpendicular to the horizontal line, as well as a handle configured in said top portion, wherein the handle has a first portion parallel to the horizontal line and a second portion parallel to the injection port, in the ready position, and wherein the three-way stopcock assembly has rotation capabilities relative to the body portion of the catheter hub assembly, characterized in that a bore is provided in the handle, wherein the bore has an opening in a top portion thereof communicating with said central chamber and defining a top port, wherein a flow regulating member is arranged in between the opening of the top port and the central chamber such that it allows fluid passage only from the outside to the central chamber and prevents back flow of fluid from the central chamber to the outside, and wherein the bore is a blind hole with a side opening at the bottom which communicates with the central chamber and the flow regulating member is an elastic element covering the side opening from the central chamber side of the blind hole. an integrated three-way stopcock assembly, and a catheter hub assembly having a proximal end configured to be connected to a needle hub having a needle, and having a distal end configured to be connected to a catheter tube, wherein a straight needle is capable of passing through said proximal end and distal end of the catheter hub assembly, in a ready position of the intravenous catheter apparatus, said catheter hub assembly includes: a wing housing at the distal end, a housing at the proximal end, and a body portion in between housing said three-way stopcock assembly; wherein said body portion comprises an entry port in communication with said housing, an exit port in communication with said wing housing, wherein the entry port and the exit port extend along a horizontal line in an axial direction, and an injection port, wherein all of these ports (44, 46, 48) are confluent at a central chamber configured within the body portion; wherein said three-way stopcock assembly has a top portion and an opposing bottom portion, both along a vertical line perpendicular to the horizontal line, as well as a handle configured in said top portion, wherein the handle has a first portion parallel to the horizontal line and a second portion parallel to the injection port, in the ready position, and wherein the three-way stopcock assembly has rotation capabilities relative to the body portion of the catheter hub assembly, a wing housing at the distal end, a housing at the proximal end, and a body portion in between housing said three-way stopcock assembly; wherein said body portion comprises an entry port in communication with said housing, an exit port in communication with said wing housing, wherein the entry port and the exit port extend along a horizontal line in an axial direction, and an injection port, wherein all of these ports (44, 46, 48) are confluent at a central chamber configured within the body portion; wherein said three-way stopcock assembly has a top portion and an opposing bottom portion, both along a vertical line perpendicular to the horizontal line, as well as a handle configured in said top portion, wherein the handle has a first portion parallel to the horizontal line and a second portion parallel to the injection port, in the ready position, and wherein the three-way stopcock assembly has rotation capabilities relative to the body portion of the catheter hub assembly, characterized in that a bore is provided in the handle, wherein the bore has an opening in a top portion thereof communicating with said central chamber and defining a top port, wherein a flow regulating member is arranged in between the opening of the top port and the central chamber such that it allows fluid passage only from the outside to the central chamber and prevents back flow of fluid from the central chamber to the outside, and wherein the bore is a blind hole with a side opening at the bottom which communicates with the central chamber and the flow regulating member is an elastic element covering the side opening from the central chamber side of the blind hole.