Gravity and rheotaxis based sperm sorting device employing a cam-actuated pipette mechanism.

Until now, a swim-up or microchip-based method has been mainly utilized for separating normal sperm for use in assisted reproductive technology. However, it requires excessive sorting time due to preprocessing and collects a limited number of motile sperms. To improve this process, we propose a gravity-fed high motility sperm sorting device that utilizes the rheotaxis of sperm, which minimizes separation time and improves throughput.

A reel mechanism-based robotic colonoscope with high safety and maneuverability.

Background: At present, the colonoscopy is the most common method of screening for colorectal cancer. However, endoscopists still encounter difficulties with intubation, primarily due to the structural diversity (e.g.