Patent ID: 8328877

Claim:
A ureteral stent comprising, an elongate body having a first end and a second end and defining an internal lumen extending there between, the elongate body having a length at least sufficient to extend through a ureter of a patient such that the first end is configured to be disposed in a bladder of the patient and the second end is configured to be disposed in a kidney of the patient; a first retention element incorporated with the first end of the elongate body, the first retention element having a plurality of coils coiling toward the second end of the elongate body around a first section of the elongate body, each of the coils from the plurality of coils coiling around the elongate body at varying distances from the first section of the elongate body and having a diameter, the diameter of each coil from the plurality of coils increasing as the plurality of coils extends from the first end toward the second end of the elongate body such that a first coil from the plurality of coils having a greater diameter than the remaining coils contacts a bladder wall of the patient when the first end of the elongate body is disposed in the bladder; and a second coil from the plurality of coils having a diameter smaller than the remaining coils is configured to pass through at least another coil from the plurality of coils different than the first coil when at least a portion of the first section of the elongate body is moved toward the kidney during ureter lengthening when the first end of the elongate body is disposed in the bladder.