PROF. DAVID F MOBLEY, M.D.
Urology at Katy Fwy, Houston, TX

4043346, Aug 23, 1977

Mar 10, 1976

5/665647

David F. Mobley - Houston TX
Neil H. Baum - Houston TX

Baylor College of Medicine - Houston TX

A61M 2500

128349R

A catheter is disclosed which is simple to use, avoids the problems with prior catheters, which is fail-safe and fool-proof and one by which the patient cannot injure himself. The catheter comprises a flexible inner tubular member forming a flow duct, snuggly and slidably disposed in an outer tubular member, and having a rounded expansion tip at its inner end comprised of a plurality of prongs biased outwardly and operable to expand and open on inward movement of the inner tubular member in the outer tubular member to a position where the prongs are beyond the inner end of the outer member and to retract on movement of the inner tubular member outwardly in the outer tubular member to a position where at least a portion of the prongs are within the outer tubular member. The outer end of the inner tubular member extends outwardly sufficiently for this movement and has a circumferentially and outwardly extending shoulder adjacent its outer end to engage and secure an end of a resilient drain tube to the inner tubular member. Detents, preferably axially spaced, circumferentially extending mating rings and grooves, are disposed on the inner and outer tubular members which releasably lock them in a position where the prongs are expanded and in a position where the prongs are retracted.