Anvil assemblies with collapsible frames for circular staplers

An anvil support member for a surgical stapling device, said anvil comprising:

• a shaft configured for attachment to an actuator portion of the surgical stapling device;
• and
• a reconfigurable linkage assembly coupled to said shaft, said linkage assembly being reconfigurable from a first configuration wherein said linkage assembly may be inserted through a cannula opening to a second expanded configuration adapted to support an anvil plate assembly.

An anvil for a surgical stapling instrument, said anvil comprising:

• an anvil shaft configured for attachment to an actuator portion of the surgical stapling device, said anvil shaft defining a shaft axis;
• and
• a reconfigurable anvil head assembly coupled to said anvil shaft, said anvil head having an overall width measured along an axis that is substantially perpendicular to said shaft axis, said anvil head being reconfigurable between a radially contracted first orientation wherein said overall width has a first magnitude and a radially expanded second orientation wherein said overall width has a second magnitude that is greater than said first magnitude.