Patent ID: 8419626

Claim:
A surgical system comprising: a first instrument defining a fluid flow channel; a second instrument receivable by the first instrument fluid flow channel; and a valve coupled to the first instrument and configured to control fluid flow through the first instrument channel, wherein the valve includes a housing and a body within the housing, the body defining a first body channel and a second body channel and being configured to be moved between a first position in which the first body channel is longitudinally aligned with the first instrument channel and the second body channel is not longitudinally aligned with the first instrument channel, and a second position in which the first body channel is not longitudinally aligned with the first instrument channel and the second body channel is longitudinally aligned with the first instrument channel, and wherein the valve is configured such that impedance to fluid flowing through the valve and the first instrument channel is substantially the same without the second instrument received in the first instrument channel when the body is at the first position and with the first instrument channel partially blocked by the second instrument such that the first instrument channel is limited to a region between the first and second instruments when the body is at the second position.