The device relates to instruments for medical examination and diagnostic and treatment procedures with respect to body cavities. The device (proctoscope) is used in coloproctology and is intended for diagnosing and treating haemorrhoids, and is used in an operation for sutural ligation of haemorrhoidal vessels carried out under the guidance of ultrasonic Doppler sonography. The proctoscope comprises a translucent housing with an opening for access to the surface of the rectum； a head of the housing； an ultrasonic sensor； a light source； and a handle. In a lower part of the housing, there is a compartment with internal side walls, said compartment having disposed therein a plate or panel which has light-emitting diodes disposed in the lower part thereof, along the length thereof, which fulfil the role of a light source, wherein said light-emitting diodes are arranged in such a way that the light flux thereof is oriented primarily perpendicularly to the internal side walls of the compartment, while the ultrasonic sensor is accommodated in an upper part of the plate or panel, said sensor having an outlet to the outer face of the housing in the terminal thereof, between the opening and the head of the housing, wherein the sensor is arranged with an inclination towards the opening； furthermore, the terminal of the plate or panel is disposed in a stop inside the head of the housing, which makes it possible to increase the accuracy of the manipulations carried out and the quality of the operation of the device.
