Abstract: The device for hemostatic treatment of a puncture opening following catheterization comprises an elongate tubular penetration member having a longitudinal axis, an internal end, an external end and a passageway therein including at least one longitudinal channel which extends at least a major portion of the distance between the internal and external ends. A pressure gauge is connected by connecting structure to the external end of the penetration member and to the longitudinal channel. A reservoir for hemostatic pharmacon is provided and is connected to the external end of the penetration member. The penetration member is provided with an opening, close to the internal end of the penetration member, for communicating the pressure gauge to the puncture opening.