Adapter assemblies for interconnecting surgical loading units and handle assemblies

A method of assembling a surgical instrument, comprising:

• inserting a proximal end of a surgical loading unit into a distal end of an elongated body and an annular member that is rotatably supported by the elongated body;
• rotating the surgical loading unit about a longitudinal axis defined by the surgical loading unit and relative to the elongated body, thereby rotating the annular member, within the elongated body, from a first orientation to a second orientation.

A method of disassembling a surgical instrument, comprising rotating a surgical loading unit about a longitudinal axis defined by the surgical loading unit and relative to an elongated body, thereby rotating an annular member that is rotatably supported in the elongated body:

• from a second orientation, in which at least one electrical contact of the annular member is electrically connected with the circuit assembly, whereby a circuit is completed,
• to a first orientation, in which the at least one electrical contact of the annular member is electrically isolated from the circuit assembly.