Abstract: A urethral catheter designed to employ the principle of urethral irrigation with the patient's own urine to combat rising infection. This irrigation is achieved by having the section of the catheter which lies in the urethra equipped with windows which are arranged so that large surface areas of the urethral mucous membranes are irrigated by urine. Through judicious positioning of a mandrin in the catheter's lumen one can achieve a forced flow of urine through these windows and between the catheter and the urethral mucous membranes, the flow returning through further windows into the hollow interior of the mandrin and proceeding out of the body to a drainage system.

Abstract: A ureter tube with mandrin and auxiliary tube, designed so that all three elements are adapted to be connected together by different clamping means such that they functionally form an entity for the introduction process, this entity being so stable that the three elements cannot detach themselves from one another even in the case of back and forth sliding and rotational movements. Upon correct placement of the ureter tube, the connection between ureter tube and auxiliary tube is released upon removal of the mandrin, the auxiliary tube is also removed and the ureter tube is left in the body, with the curvatures of its tip and its end lying between renal pelvis and bladder.

Abstract: An arrangement comprising a ureter tube, a mandrin having an outer shaft and an inner shaft, the inner shaft being longitudinally movable relatively to the outer shaft, and an auxiliary tube, the ureter tube and auxiliary tube being slidable onto the mandrin, and the mandrin and the ureter tube being releasably connected with each other; pear the proximal end of the mandrin outer shaft provisions are made for facilitating the introduction of an X-ray contrasting medium, and the distal end of the ureter tube having at its face a central opening, whereby the contrasting medium is enabled to flow through the length of the mandrin outer shaft in a substantially rectilinear path and to then exit the arrangement at the central opening.

Abstract: A drainage tube (drainage split for the ureter) with mandrin and auxiliary tube, designed so that all three elements can be connected with each other by screwing in such a manner that, upon insertion into the body tubes, such as for example the ureter, they form functionally a unit of a stability such that the three elements, upon insertion, when slid in either direction, cannot be separated from each other.

Abstract: An indwelling urethral catheter arrangement for the prevention of ascending bacterial infection which is of such a design that, on the one hand the bacteria are flushed downwardly by urine permitted to flow along the inside of the urethral wall and, on the other hand, the entire urinary stream is conducted, with the aid of a condom-like sheath fittable over the tip of the penis, to the outside of the catheter arrangement; in this fashion soiling of the patient's clothing will be avoided regardless of the flushing provision.

Abstract: An endoscope for resecting tissue inside body cavities, the principal feature of which is that the endoscopic tube contains a shaft carrying a grinding or milling head, which allows precise removal of scar tissue or other fairly firm tissue under endoscopic control without leaving irregular or thermally damaged wound sites.

Abstract: Guiding mandrin for drainage ducts featuring a wedge that by being pushed in or pulled out of the split tip of the mandrin tube will cause said tip to increase or reduce its diameter according to requirement. Hereby, a firm contact between guiding mandrin and drainage duct can be established which will significantly facilitate the handling of the drainage duct.