A fluid administration medical apparatus comprising: a catheter tube ; a hub having a distal section and a proximal section , wherein the distal section is joined to the catheter tube and the proximal section defines a housing ; one or more ports connected to the hub by a fluid passage through a passageway ; a needle having a needle shaft extending through the hub and the catheter tube and defining an axial direction (X), wherein the needle has opposite proximal and distal ends , the distal end forming a needle tip ; a needle hub attached to the proximal end of the needle ; a needle guard that is slidably arranged on the needle and comprises a base, wherein the needle guard is movably retained in the housing defining a chamber of the hub when the needle extends through the hub and the catheter tube , wherein the needle guard is removable from the hub once the needle tip is received in the needle guard upon withdrawal of the needle from the catheter tube ; and wherein the hub is made of two parts i.e. first part and second part each of the parts having a distal end section and a proximal end section ;; wherein a stopper having a through-bore is arranged in the needle guard ; wherein a through-bore of a hole in the base of the needle guard is slightly larger than the through-bore of the stopper ; and wherein the diameter of the needle shaft is slightly lesser than the through-bore of the stopper and wherein the base of the needle guard , the stopper and the needle shaft are closely fitted, characterized in that the hub is provided with an opening or window providing additional space for arms of the needle guard in the ready position. a catheter tube ; a hub having a distal section and a proximal section , wherein the distal section is joined to the catheter tube and the proximal section defines a housing ; one or more ports connected to the hub by a fluid passage through a passageway ; a needle having a needle shaft extending through the hub and the catheter tube and defining an axial direction (X), wherein the needle has opposite proximal and distal ends , the distal end forming a needle tip ; a needle hub attached to the proximal end of the needle ; a needle guard that is slidably arranged on the needle and comprises a base, wherein the needle guard is movably retained in the housing defining a chamber of the hub when the needle extends through the hub and the catheter tube , wherein the needle guard is removable from the hub once the needle tip is received in the needle guard upon withdrawal of the needle from the catheter tube ; and wherein the hub is made of two parts i.e. first part and second part each of the parts having a distal end section and a proximal end section ;; wherein a stopper having a through-bore is arranged in the needle guard ; wherein a through-bore of a hole in the base of the needle guard is slightly larger than the through-bore of the stopper ; and wherein the diameter of the needle shaft is slightly lesser than the through-bore of the stopper and wherein the base of the needle guard , the stopper and the needle shaft are closely fitted, characterized in that the hub is provided with an opening or window providing additional space for arms of the needle guard in the ready position. <EOS>