Cable-actuated adapter for surgical stapling instrument

A surgical stapling instrument comprising:

• an anvil assembly including an anvil head and an anvil center rod extending proximally from the anvil head;
• a shell assembly including an annular staple cartridge including a plurality of staples;
• and
• an adapter assembly including:
• a tubular shaft supporting the shell assembly at a distal portion of the tubular shaft;
• an approximation assembly including:
• a lead screw;
• a tubular member threadably engaging the lead screw such that rotation of the lead screw causes axial displacement of the tubular member;
• a cable extending within the tubular shaft and coupled to the tubular member for concomitant displacement with the tubular member;
• and
• a trocar assembly extending from the cable, the trocar assembly coupled to the anvil assembly such that axial displacement of the tubular member transitions the anvil assembly between a spaced apart configuration, in which, the anvil head is spaced apart from the annular staple cartridge, and an approximated configuration, in which, the anvil head is in juxtaposed alignment with the annular staple cartridge;
• and
• a seal providing a fluid-tight seal such that the adapter assembly includes a sealed portion and an unsealed portion, wherein the lead screw is disposed within the sealed portion.