A continuous flow endoscope device includes an inflow and an outflow, an elongated tubular member, a first channel, a second channel, and an optics device. The elongated tubular member defines a lumen extending therethrough. The first channel extends through the lumen and is configured to receive an instrument therethrough. The second channel extends through the lumen. The optics device is disposed in a free space of the lumen not occupied by the first channel or the second channel. The first channel or the second channel is coupled to the inflow, and the other of the first channel or the second channel is coupled to the outflow.
