Cutting assembly for surgical instrument with clog-reducing hub

A cutting assembly configured to be removably coupled to a drive assembly of a surgical instrument, the cutting assembly comprising:

• a tube assembly defining a cutting window and comprising an outer tube, and an inner tube coaxially disposed within the outer tube and defining a lumen in communication with the cutting window, wherein the inner tube is configured to be rotatable relative to the outer tube with the drive assembly;
• a drive hub comprising a hub member coupled to a proximal end of the inner tube to define a suction path through the hub member and the inner tube, wherein a diameter of the lumen of the inner tube is less than an inner diameter of the hub member such that resected tissue moves from a smaller cross sectional portion of the suction path to a greater cross sectional portion of the suction path at an interface between the drive hub and the inner tube;
• and
• a connecting hub disposed about the inner tube and a portion of the drive hub to allow the drive assembly to be removably coupled to the cutting assembly, wherein the connecting hub defines a cavity,
• wherein the smaller cross sectional portion of the suction path is disposed within the cavity of the connecting hub.

A cutting assembly configured to be removably coupled to a drive assembly of a surgical instrument, the cutting assembly comprising:

• a tube assembly defining a cutting window and comprising an outer tube, and an inner tube coaxially disposed within the outer tube and defining a lumen in communication with the cutting window, wherein the inner tube is configured to be rotatable relative to the outer tube with the drive assembly;
• a drive hub comprising a hub member coupled to a proximal end of the inner tube and defining a suction path, the hub member comprising a lip disposed within the suction path, wherein a proximal end of the inner tube is abutting the lip with a diameter of the lumen of the inner tube being less than an inner diameter of the hub member opposite the lip;
• and
• a connecting hub disposed about the inner tube and a portion of the drive hub to allow the drive assembly to be removably coupled to the cutting assembly, wherein the connecting hub defines a cavity,
• wherein a portion of the hub member is disposed within the cavity of the connecting hub, and wherein the lip is positioned proximal to the cavity.