An indwelling urinary catheter system having an elongated tubular catheter body 401 having a distal end and a proximal end； at least one sleeve portion 406 constructed out of a semi-permeable membranes surrounding at least one portion of the catheter body； at least one lumen to instill fluid into the catheter body； and a means to continuously efflux the instilled fluid through the semi-permeable membrane for circumferential egress of fluid out of the membrane around the catheter body. The catheter may further include a drainage lumen 414 extending through the catheter body from just short of the distal end to the proximal end and an opening or eyelet 405 in the catheter body just short of the distal end of the catheter body to permit urine to drain from a patient's bladder into the drainage lumen. A retaining mechanism may also be comprised.
