Locking-cylinder supported surgical boot

A stirrup for an operating room table, said stirrup comprising:

• a limb support;
• an adjustable support arm including:
• an attachment;
• an axle secured to said attachment and rotatable relative to said attachment about a first axis;
• a support rod having an end pivotally attached to said axle and pivotable about a second axis, said second axis being substantially perpendicular to said first axis;
• a first extendable and retractable locking cylinder having a first end pivotally attached to said attachment and a second end pivotally attached to said support rod, wherein said first locking cylinder is unlockable to pivot said support rod about said first axis to a desired position and lockable to retain said support rod in the desired position;
• and
• a second extendable and retractable locking cylinder having a first end pivotally attached to said axle and a second end pivotally attached to said support rod, wherein said second locking cylinder is unlockable to pivot said support rod about said second axis to a desired position and lockable to retain said support rod in the desired position;
• and
• an adjustable clamping assembly attaching said limb support to said support rod of said adjustable support arm.

An adjustable support arm for supporting a limb of a person during surgery, said adjustable support arm comprising:

• an attachment;
• an axle secured to said attachment and rotatable relative to said attachment about a lithotomy axis;
• a support arm having an end pivotally attached to said axle and pivotable about an abduction axis, said abduction axis being substantially perpendicular to said lithotomy axis;
• a lithotomy locking cylinder having a first end pivotally attached to said attachment and a second end pivotally attached to said support arm, said lithotomy locking cylinder including a cylinder and a piston within said cylinder and having an integral valve, said piston dividing said cylinder into first and second, said first and second portions being selectively in fluid communication through said integral valve and each containing a fluid to provide locking;
• and
• an abduction locking cylinder having a first end pivotally attached to said axle and a second end pivotally attached to said support arm, said abduction locking cylinder including a cylinder, a piston within said cylinder and having an integral valve, and a separating piston within said cylinder, said piston and said separating piston dividing said cylinder into first, second, and third portions, said first and second portions being selectively in fluid communication through said integral valve and each containing an incompressible fluid to provide rigid locking, said third portion containing a compressed gas to bias the support arm to a minimum abduction position.

An adjustable support arm for supporting a limb of a person during surgery, said adjustable support arm comprising:

• an attachment;
• an axle secured to said attachment and rotatable relative to said attachment about a lithotomy axis;
• a support arm having an end pivotally attached to said axle and pivotable about an abduction axis, said abduction axis being substantially perpendicular to said lithotomy axis;
• a lithotomy locking cylinder having a first end pivotally attached to said attachment and a second end pivotally attached to said support arm, said lithotomy locking cylinder including a cylinder, a piston within said cylinder and having an integral valve, and a separating piston within said cylinder, said piston and said separating piston dividing said cylinder into first, second, and third portions, said first and second portions being selectively in fluid communication through said integral valve and each containing an incompressible fluid to provide rigid locking, said third portion containing a compressed gas to provide the support arm with an assisting lift force;
• and
• an abduction locking cylinder having a first end pivotally attached to said axle and a second end pivotally attached to said support arm, said abduction locking cylinder including a cylinder, a piston within said cylinder and having an integral valve, and a separating piston within said cylinder, said piston and said separating piston dividing said cylinder into first, second, and third portions, said first and second portions being selectively in fluid communication through said integral valve and each containing an incompressible fluid to provide rigid locking, said third portion containing a compressed gas to bias the support arm to a minimum abduction position.