Arrangement comprising a ureter tube, an auxiliary tube as well as a mandrin

DETAILED DESCRIPTION An object of this invention is to change the mentioned simple arrangement described in U.
S.
Pat.
No.
4,212,304, in order to enable an easy insertion of the ureter tube, especially in cases where the ureter has narrowed passages and/or has a course full of corners.
The object can be achieved with an arrangement for the insertion of a ureter tube into the ureter or renal pelvis, which arrangement comprises a ureter tube (A), an auxiliary tube (B) and a mandrin (C), wherein at least the upper tip of the ureter tube (A) has an inherent curvature, wherein the mandrin (C) at its upper end has an inherent curvature, the mandrin (C) has in the hollow-space inside of the mandrin (C) a steering wire (18) being essentially stiff against bending and movable in the longitudinal direction of the mandrin (C), and the upper tip (12) of the ureter tube (A) allows the mandrin to project above the tip of the ureter tube (A) at least with its section of its inherent curvature.
The mandrin (C) can be a single mandrin or a double mandrin consisting of an outer mandrin (5) and an inner mandrin (4), movable in and in the longitudinal direction relative to the outer mandrin and wherein ureter tube (A) and auxiliary tube (B) are slidable over the double mandrin.
If the mandrin (C) is a double mandrin, the inner mandrin (4) is hollow and the steering wire (18) is in the hollow-space of the inner mandrin (4) from which it can be pulled out, and the inner mandrin (4) has an inherent curvature (4d) and the inner mandrin (4) projects from the tip (12) of the ureter tube facing toward the patient.
In a preferred embodiment of the invention the upper tip (4d) of the inner mandrin (4) is closed against a passage of X-ray contrast medium and/or the steering wire.
In addition to the advantages of an inherent curvature of the tip of the ureter tube, the present invention gives the additional advantages of an inherent curvature of the tip of the mandrin, i.
e.
of the upper section of the mandrin facing the patient