RF shaver auxiliary suction

The present disclosure relates to a rotary shaver arrangement for a surgical instrument, the rotary shaver arrangement comprising an outer tubular member; and an inner tubular member rotatably mounted in a central passageway of the outer tubular member, the inner tubular member providing a central suction lumen. Wherein the inner tubular member further comprises one or more longitudinal grooves that run from the distal end to the proximal end of the rotary shaver arrangement to create a suction lumen passageway between the inner tubular member and the outer tubular member. This rotary shaver arrangement optimises the balance between shaver performance and RF thermal performance, by providing a defined minimum gap between the inner and outer tubular members in the form of longitudinal grooves, to provide an additional pathway for saline used to cool the RF suction lumen.