A balloon-free urinary catheter (15) comprising a tubular retention section (15A) shaped to locate in the neck of a patient's bladder and a tubular drainage section (15B) which, in use, is received in the patient's urethra. The retention section (15A) has a diameter which is normally greater than the neck of the bladder (2) but is stretchable on the application of an axial force thereto to reduce its diameter to less than that of the urethra (3). This allows the catheter to pass through the urethra until the retention section (15A) is positioned inside the bladder where it expands and returns to its original size on release of the axial force and locates in the neck of the bladder to form a seal therewith.
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