Apparatus for self-catheterisation; Balloon inflating devices for balloon dilation catheters; Catheter apparatus; Catheter sets; Catheters; Catheters for medical use; Catheters for surgical use; Catheters for use in urology; Dilatation catheters; Hand-operated balloon inflating devices for use with balloon dilatation catheters; Inner lumens for balloon catheters; Medical apparatus for urethral catheterization; Medical catheter placement devices; Medical catheters; Tubing for use with catheters; Urethral catheterisation apparatus; Urethral catheterisation instruments