Trocar and cannula assembly having conical valve and related methods

A cap assembly of a cannula comprising:

• a valve housing having at least one opening formed in line with an axis of said valve housing, said at least one opening being defined by an inner valve housing sidewall;
• and
• a first valve positioned at least partially within said valve housing and including a valve body having:
• a proximal valve section positioned within said valve housing and including an annular shaped valve ring having a proximal surface, a distal surface, an inner perimeter surface, and an outer perimeter surface,
• a distal valve section extending axially from said proximal valve section and including a valve extension having a proximal end portion, a distal end portion, and a substantially conically shaped medial portion connected to and extending therebetween, and having a plurality of friction-reduction features disposed proximate said distal end portion and extending a distance in said substantially conically shaped medial portion;
• and
• a valve opening positioned in said distal end portion of said valve extension and adapted to individually and separately receive therethrough any one of a plurality of different elongate tools each having a different diameter so that when any one of the plurality of elongate tools is positioned through said valve opening a seal is maintained between peripheries of said valve extension surrounding said valve opening and outer peripheries of any one of plurality of elongate tools extending therethrough,
• wherein said proximal valve section, said distal valve section, and said valve opening comprise said valve body, and wherein said valve body is a singularly formed member.