A penis erection stimulation system comprises one or more infusion needles disposed within and implanted along with one or more housings adjacent the patients left and right corpora cavernosa. A reservoir and a pump are also implanted inside the patients body to supply the infusion needle with infusion liquid. A drive unit also adapted for implantation inside the patients body is arranged for advancing and retracting the tip end of the infusion needle such that it penetrates the housing in at least one penetration area, preferably at least in two different penetration areas either simultaneously or in immediate time succession, thereby injecting drugs along with the infusion liquid into the patients body for stimulating penis erection. The outer wall of the housing accommodating the infusion needle comprises at least one door in the penetration area or areas. A drive is connected to the door for actively opening the door so as to allow for the infusion needle to be advanced through the opened door. The door may comprise a flap, such as a resilient, normally closed flap. It is particularly preferred if the drive connected to the door forms part of the drive unit coupled to the infusion needle. More specifically, the arrangement may be such that advancement of the infusion needle by means of the drive unit simultaneously causes the drive to open the door.L’invention concerne un système de stimulation dérection du pénis, qui comprend au moins une aiguille dinfusion disposée dans et implantée avec au moins une enveloppe jouxtant les corps caverneux gauche et droite dun patient. Un réservoir et une pompe sont également implantés dans le corps du patient pour alimenter laiguille dinfusion en liquide dinfusion. Une unité dentraînement, également adaptée pour simplanter dans le corps du patient, est conçue pour sortir ou rentrer la pointe de laiguille dinfusion de sorte quelle perfore lenveloppe dans au moins une zone de pénétration, de préférence deux zones de pénétration
