Abstract: An ultrathin-caliber endoscopic instrument, which can be used in various clinical scenarios, such as in embryo transfer procedures. The endoscopic instrument comprises a tubular body and imaging elements for optical imaging or ultrasound imaging. The tubular body may be ultra-thin caliber, for example, having an outer diameter of about 1 mm. There is a working channel extending through the tubular body. An embryo transfer catheter may be passed through the working channel. Images are transmitted via a wireless radio transmitter, such as a Wi-Fi transmitter. The endoscopic instrument may be designed to be fully or semi-disposable after use.