A surgical device (2) having a distal end and a proximal end, and comprising a delivery portion (12) extending from the proximal end and comprising first and second instrument delivery channels, an active portion (4,8) at a distal portion of the device and a plug (10) having a proximal end and a distal end, and engageable with the delivery portion at its proximal end, and with the active portion at its distal end, the plug comprising first and second plug channels (82) each defining a curved path, such that the plug channels diverge from one another towards the distal end of the plug wherein when the plug is engaged with the delivery portion the first plug channel and the first instrument delivery channel form a first instrument channel and the second plug channel and the second instrument delivery channel form a second instrument channel.