Figure 1

Overview of OpticLine use and mechanical construction. (a) The OpticLine chamber is inserted in-line with the drainage tubing, between the drain line and effluent fluid collection, when the patient is setting up for their peritoneal dialysis (PD) session. The OpticLine clamp then clamps over the chamber and images effluent as it flows through the clamp during drain times. The user interacts with the device via a touchscreen on the top of the clamp, and presses “Start” when they begin their PD session. Created with Onshape.com. (b) As labelled on front and side views, the clamp is 125 mm long, 68 mm wide, and 68 mm tall. The top part of the clamp contains the microprocessor. The expanded view on the left shows the clamp’s optical components in relation to the viewing chamber. The top part of the clamp contains a hemispheric LED that provides backlight for the lens, and a thermal sensor that detects fluid flow through the chamber and signals to the microprocessor that the camera should begin capturing images. The bottom part of the clamp contains the camera, which is connected to the microprocessor, and a ball lens that magnifies the camera’s view 140×. Created with Onshape.com and BioRender.com. (c) Photographs of an OpticLine prototype. The top photo shows the entire clamp with the chamber inserted. The bottom photo is a close-up of the clamp’s optical interface. The microscope lens is recessed in the square hole, and the four small rectangular divots mate with prongs on the chamber to prevent it from sliding during use.