or more ring like structures or coils may be deployed within the lumen or several expanders e g 2 to 20 expanders or more may be deployed adjacent to one another in other variations 2 to 4 expanders e g each expander having one or more ring like structures or coils may be deployed while in other variations 3 expanders may be deployed when deployed sufficient spacing e g spacing may range anywhere from e g 3 mm to 20 mm may be provided between adjacent expanders along the prostatic urethra pu to allow for the invagination of the expanders by the tissue wall the spacing between the expanders shall be optimized to permanently relieve the obstruction while minimizing the total amount of material placed in the urethra to avoid tissue irritation or encrustation alternatively the expanders may be deployed to overlap with respect to adjacent expanders these several expanders may be deployed in a sequential or connected manner within the prostatic urethra pu that facilitates an open passageway from the bladder bl to the membranous urethra mu one variation is shown in the top view of fig2 which shows an expander 20 which defines an opening 24 for passage of urine therethrough the expander 20 may be configured to be adjustably sized either prior to deployment or during deployment via an adjustable locking mechanism 22 which may allow for the sliding release and securement of the free ends of the expander member the locking mechanism 22 with adjustable ends may allow for the diameter of the expander 20 to be adjusted between a specified minimum and maximum length as described herein fig3 shows a.