Laparoscopic and endoscopic instruments for minimally invasive surgery are widely used and developed. Previously, author proposed an optical system for an endoscope operating in the long-wavelength IR spectral range  for thermal monitoring of biological tissue during surgery. The system is a sequence of germanium lenses. This paper discusses energy performance of the resulting system. The analysis of the long wave infrared range (LWIR) detectors is presented, absorption and throughput is evaluated. Signal-to-noise ratio of the resulting system is calculated.
In the field of biomedical optics, laparoscopes for high temperature treatment of various internal tissues are widely used. With the help of medical endoscopes, it is possible to examine the internal cavities of the human body, biopsy, administer medications, remove tumors, and use laser radiation for surgical and therapeutic purposes. To achieve high performance of optical system’s combination of components made of optical polymers which are transparent in the long-wavelength spectrum are proposed. Technological aspects of optical systems are observed. Computer modeling of infrared endoscope system using Zemax software is presented. Selection of appropriate optical materials is described. Discussion of effective introduction of polymer components into the optical design is provided. Optical performance of the achieved endoscopic systems is shown.