Medical and surgical instruments and their related accessories for use in urological related surgery, namely, urethral sounds, advancement rods and coils extendable through urethral sounds for advancing a trocar outwardly from a urethral sound, trocars, brake wheels for locking advancement rods or coils against movement relative to a urethral sound, depth indicators for properly positioning a urethral sound inside a body cavity, alignment arms for allowing the precise mechanical location of a urethral sound inside a body cavity to precisely locate a surgical pathway from inside the body cavity to outside the body cavity, alignment arm measurement systems for allowing precise determination of a surgical pathway length from inside a body cavity to outside the body cavity, advancement handles for advancement of a trocar from inside a body cavity to outside the body cavity, trocar capture housings for the capture, removal, and disposal of a trocar, capture housing funnels for guiding trocars into a capture housing, capture housing tubes for capture, retention and removal of a trocar from an advancement rod or coil, advancement coil couplings for attachment of a trocar and catheter to an advancement coil or rod, sound tips for forming a bull nose covering on a sound tip to allow easy passage of the sound into a body cavity and allowing for advancement of a trocar outwardly from the sound through a sound tip