Stimulation of penis erection

A penis erection stimulation system, comprising

• at least one infusion needle (11) disposed at least partly within at least one housing (12) with a tip end (13) of the at least one infusion needle arranged for penetrating the at least one housing's outer wall (15) in two or more different penetration areas (14), the at least one housing being adapted for implantation inside the patient's body,
• at least one reservoir (R1, R2) adapted for implantation inside the patient's body in fluid connection with the at least one infusion needle to supply to the infusion needle a substance to be injected into the patient's body,
• at least one pump (P) adapted for implantation inside the patient's body to advance the substance from the reservoir to the at least one infusion needle, and
• at least one drive unit (D) adapted for implantation inside the patient's body, the at least one drive unit being coupled to the at least one infusion needle and arranged at least for advancing and retracting the tip end of the at least one infusion needle so that the at least one infusion needle penetrates, upon advancement of the tip end or ends thereof, at least two of said different penetration areas so as to allow for stimulation of penis erection by injecting the substance through said at least two different penetration areas via the at least one infusion needle.