Stents with bladder retention members

A medical device comprising:

• an elongate member having a distal end portion, and a proximal end portion, the distal end portion including a first retention member configured to be disposed within a kidney of a patient, the proximal end portion including a second retention member configured to be disposed within a bladder of the patient, the elongate member including a medial portion disposed between the distal end portion and the proximal end portion, the medial portion being of a length configured to extend from the kidney to the bladder,
• the first retention member being composed of a first material, the medial portion being composed of a second material such that the second material extends along the length of the medial portion and into a distal end portion of the second retention member, the second retention member including a proximal end portion being composed of a third material,
• wherein prior to implantation within the patient each of the first material, the second material, and the third material includes a different respective biocompatible plastic having different respective first, second and third durometer values, the second material having a lower durometer value than the first material, the second material having a lower durometer value than the third material, the first material having a durometer of between 86 and 90 shore A, the second material having a durometer of between 82 and 86 shore A, and the third material having a durometer of between 86 and 95 shore A, the medical device being co-extruded.

A device comprising:

• an elongate member having a distal end portion, and a proximal end portion, the distal end portion including a retention member configured to be disposed within a kidney of a patient, the proximal end portion including a malecot configured to be disposed within a bladder of the patient, the elongate member including a medial portion disposed between the distal end portion and the proximal end portion, the medial portion being of a length configured to extend from the kidney to the bladder,
• the retention member of the distal end portion of the elongate member being entirely composed of a first material, the malecot including a distal end portion composed of the second material and a proximal end portion composed of a third material,
• wherein prior to implantation within the patient each of the first material, the second material, and the third material includes a different respective biocompatible plastic having different respective first, second and third durometer values, the second material having a lower durometer value than the first material, the second material having a lower durometer value than the third material, the first material having a durometer of between 86 and 90 shore A, the second material having a durometer of between 82 and 86 shore A, and the third material having a durometer of between 86 and 95 shore A, the device being co-extruded.