Ureteric stone extractor with two ballooned catheters
First Claim
1. A stone extractor for extracting a ureteral stone arrested within any of various sections of a ureter of a patient wherein said various sections include ureteral sections above the lower third sectional area of said ureter;
- said stone extractor comprising;
first inflatable means for gradually applying an increasing outward radial force to inner walls of said ureter wherein said inner walls are distended in response to said radial force in a manner such that a stress relaxation state is induced therein;
first catheter means connected to said first inflatable means and adapted to position said first inflatable means below the position of arrestment of said ureteral stone;
second inflatable means for applying a downward force to said ureteral stone to achieve dislodgment of said stone from said inner walls of said ureter;
second catheter means connected to said second inflatable means for positioning said second inflatable means above the position of arrestment of said ureteral stone; and
said second catheter means is adapted to adjust the position of said second inflatable means relative to said first inflatable means and is manually manipulable to move said ureteral stone into a spacial area of said ureter distended by said first inflatable means.
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Accused Products
Abstract
A ureteric stone extractor (100) is disclosed wherein an inner dislodger catheter (101) is slidable within a relatively larger outer dialator catheter (102). The dislodger catheter (101) comprises a lumen (104) having a stiffening metal stylet (106) therein to allow it to easily pass beyond a stone arrested within a ureter. A dislodger balloon (107) is eccentrically attached to the inner catheter (101) and can be inflated once the inner catheter (101) is positioned above and beyond the arrested stone. Nylon strings (110) positioned along longitudinal axes of the dislodger balloon (107) are manipulable by an attending physician to ensure that the dislodger catheter (101) and the strings (110) entrap the stone and to apply a downward force by the dislodger balloon (107) to the stone sufficient to dislodge it from the ureteral walls. The outer dilator catheter (102) has a cylindrical dilator balloon (113) attached thereto to effect distension and dilation of the ureter below the arrested stone, thereby providing a sufficient spacial area into which the stone can be moved.
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Citations
17 Claims
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1. A stone extractor for extracting a ureteral stone arrested within any of various sections of a ureter of a patient wherein said various sections include ureteral sections above the lower third sectional area of said ureter;
- said stone extractor comprising;
first inflatable means for gradually applying an increasing outward radial force to inner walls of said ureter wherein said inner walls are distended in response to said radial force in a manner such that a stress relaxation state is induced therein; first catheter means connected to said first inflatable means and adapted to position said first inflatable means below the position of arrestment of said ureteral stone; second inflatable means for applying a downward force to said ureteral stone to achieve dislodgment of said stone from said inner walls of said ureter; second catheter means connected to said second inflatable means for positioning said second inflatable means above the position of arrestment of said ureteral stone; and said second catheter means is adapted to adjust the position of said second inflatable means relative to said first inflatable means and is manually manipulable to move said ureteral stone into a spacial area of said ureter distended by said first inflatable means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
- said stone extractor comprising;
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16. A method for extracting a stone arrested in a ureter of a patient above the pelvi-ureteric junction, said method comprising the steps of:
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(a) applying a gradually increasing outward radial force to a first portion of inner walls of said ureter immediately below the position of said stone within said ureter and sufficient to induce a stress relaxation state of said inner walls to the extent that the diameter of a spacial area at said first portion of said inner walls is larger than the maximum diameter of said stone; (b) ceasing application of said radial force at said first portion; (c) applying a downward force from a position above the position of said stone sufficient to dislodge said stone from said inner walls while said first portion of said inner walls are in said stress relaxation state; (d) manipulating said stone downward into said spacial area at said first portion of said inner walls of said ureter; and (e) sequentially repeating steps (a) through (d) at successive lower portions of said inner walls of said ureter until said stone passes into the bladder area of said patient. - View Dependent Claims (17)
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Specification