A dilating device (100, 300) for a prostatic urethra comprising: two dilating means interconnected by a proximal connector (100f, 100g) and a distal connector (100d, 100e), the dilating means opening symmetrically on opposite lateral sides of the device (100, 300) in a normally open configuration, each of said dilating means including a longitudinally oriented peripheral ridge (100a, 100b, 204a, 204b) configured to fix the dilating means in place within the prostate urethra and prevent movement or dislodgement; wherein the dilating means and the distal connector (100d, 100e) and the proximal connector (100f, 100g) are configured to laterally expand said longitudinally oriented peripheral ridges (100a, 100b, 204a, 204b) to said normally open configuration upon deployment within the prostatic urethra to exert a lateral outwards force that dilates the prostatic urethra; characterized by each of said dilating means having a closed form; in said normally open configuration the device (100, 300) having a form resembling of a pair of butterfly wings having an open posterior side interconnected across a closed anterior side by said by a proximal connector (100f, 100g) and a distal connector (100d, 100e); two protrusions, each of said two protrusions protruding distally from a respective peripheral ridge (100a, 100b, 204a, 204b) of said longitudinally oriented peripheral ridges (100a, 100b, 204a, 204b), said two protrusions positioned on opposing postero-lateral sides of the device (100, 300) and extending distally beyond the rest of the device (100, 300) to impinge against opposite postero-lateral sides of a bladder neck of the prostatic urethra, thereby preventing a migration of the device (100, 300) into a urinary bladder. two dilating means interconnected by a proximal connector (100f, 100g) and a distal connector (100d, 100e), the dilating means opening symmetrically on opposite lateral sides of the device (100, 300) in a normally open configuration, each of said dilating means including a longitudinally oriented peripheral ridge (100a, 100b, 204a, 204b) configured to fix the dilating means in place within the prostate urethra and prevent movement or dislodgement; wherein the dilating means and the distal connector (100d, 100e) and the proximal connector (100f, 100g) are configured to laterally expand said longitudinally oriented peripheral ridges (100a, 100b, 204a, 204b) to said normally open configuration upon deployment within the prostatic urethra to exert a lateral outwards force that dilates the prostatic urethra; characterized by each of said dilating means having a closed form; in said normally open configuration the device (100, 300) having a form resembling of a pair of butterfly wings having an open posterior side interconnected across a closed anterior side by said by a proximal connector (100f, 100g) and a distal connector (100d, 100e); two protrusions, each of said two protrusions protruding distally from a respective peripheral ridge (100a, 100b, 204a, 204b) of said longitudinally oriented peripheral ridges (100a, 100b, 204a, 204b), said two protrusions positioned on opposing postero-lateral sides of the device (100, 300) and extending distally beyond the rest of the device (100, 300) to impinge against opposite postero-lateral sides of a bladder neck of the prostatic urethra, thereby preventing a migration of the device (100, 300) into a urinary bladder.