Ureteral stent

Details Ureteral stent Ureteral stent

1991-08-28

1992-08-25

Yasko, John D.

Surgery

Means for introducing or removing material from body for...

Treating material introduced into or removed from body...

A61M 2500

Patent

active

051415020

ABSTRACT:
A ureteral stent includes a stiffer stent body that affords superior columnar and axial strength for smooth advancement during insertion into a patient's ureter, and a softer bladder coil portion for reducing the risk of irritation at the trigone. A collar forms an interface between the stiffer stent body and the softer bladder coil. The collar has an annular shoulder that faces the bladder coil, providing a load transfer surface for controlled placement of the stent with a pusher tube that rides over the bladder coil. A pusher assembly includes a first inner and smaller diameter pusher having the diameter of the bladder coil, and a larger diameter pusher tube having the diameter of the collar anular shoulder. For easier placements, the smaller pusher tube bears against the bladder tube. For more difficult placements, the larger pusher tube can ride over the smaller pusher tube and engage the annular shoulder of the collar. A guide wire fits within the bore of the stent main tube body and the bore of the bladder tube. The guide wire also fits a bore of the smaller pusher tube. The guide defines a path for installation of the stent and for the pushers.

REFERENCES:
patent: 4531933 (1985-07-01), Norton et al.
patent: 4671795 (1987-06-01), Mulchin
patent: 4790809 (1988-12-01), Kuntz
patent: 4813925 (1989-03-01), Anderson, Jr. et al.
patent: 4874360 (1989-10-01), Goldberg et al.
patent: 4887996 (1989-12-01), Bengmark
patent: 4950228 (1990-08-01), Knapp, Jr. et al.

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