RU113376U1 - STEREOSCOPIC VIDEO ENDOSCOPE - Google Patents

Abstract

1. A stereoscopic video endoscope containing a housing in the distal part of which there are two identical objectives, the optical axes of which are parallel in the image space, and two identical solid-state image receivers, each image receiver being located on the optical axis of the corresponding objective, characterized in that each objective is equipped with an integrated frontal prismatic module made in the form of a block of wedge-shaped prisms glued together and two lenses on the input and output surfaces of the block, and solid-state image detectors are installed behind each of the lenses in the distal part. ! 2. The stereoscopic video endoscope according to claim 1, characterized in that the solid-state image sensor is made in the form of a small-sized CMOS matrix.

Description

The proposed utility model relates to optical instrumentation, and more specifically, to endoscopy. The utility model works with solid-state receivers and can be used to obtain stereoscopic images from objects inside closed cavities.

Known stereoscopic video endoscope according to Japan patent No. 3093875. IPC G02B 23/24. A61B 1/00, publ. 07/28/2000. The stereoscopic endoscope contains two lenses, two mirrors for converting the optical axes of the lenses at the point of the object, a distal prism, an optical wrapping system for translating the image into the proximal part, the proximal prism - splitter and proximal solid-state image receivers.

A disadvantage of the known stereoendoscope is a complex mirror system for converting the optical axes of lenses, which requires a large volume to be placed in the distal tube of the endoscope, the presence of two complex prisms for mixing and branching of the optical channels, and the presence of an optical lens image translation system that excludes the use of the optical system in flexible endoscopy. The closest in technical solution is a stereoscopic video endoscope according to US patent No. 7410463 IPC А61В 1/06 from 08/12/2008. It contains two lenses, a distal prismatic unit for converting images from both lenses into a single wrapping image translator, a proximal prism splitter and two solid-state image receivers installed in the proximal part. The disadvantage of this stereoscopic endoscope is the pronounced parallax of the stereo image when observing nearby objects, which reduces the quality of the final image.

The objective of the utility model is to create a stereoscopic video endoscope with high image quality at a practical working distance by eliminating parallax while expanding the scope of its application due to the constructive implementation of the optical scheme suitable for use in both rigid and flexible endoscopy.

The solution to this problem is achieved by the fact that in the distal part of the body of the video endoscope there are two identical lenses, the optical axes of which are parallel in the image space and two identical solid-state image pickups, each image pickup is located on the optical axis of the corresponding lens, with each lens equipped with an integrated frontal prismatic a module made in the form of a block of wedge-shaped prisms glued together and two lenses on the input and output surfaces of the unit a, a solid state image detectors are installed for each of the lenses in the distal portion. In addition, in a stereoscopic video endoscope, a solid-state image receiver is made in the form of a small-sized CMOS matrix.

The invention is illustrated by drawings, where figure 1 shows a schematic diagram of a stereoscopic video endoscope, where 1 is the plane of the object; 2 - distal protective glass; 3 - front integrated prismatic modules; 4 - lenses of lenses; 5 - solid state receivers; 6 - receiver wires; 7 - housing S - working front segment; d - stereoscopic base; φ is the deflection angle of the optical axes of the lenses.

Figure 2 schematically shows a front view of the distal end of the endoscope, where 7 is the body; 8 - lenses with integrated frontal prismatic modules; 9 - internal lens frames; 10 - a lighting channel based on a light guide fiber; 11 - a lighting channel based on a distal LED.

Figure 3 shows the optical scheme of the prismatic modules 3; where 12 is the front lens, 13-15 are wedge-shaped prisms; 16 - a back lens; 17 - the course of the optical axis inside the modules.

The claimed utility model works as follows. The distal end of the device made in the form of a tube of the housing 7 is introduced into the cavity under study so that its end is at a distance S from the observed object 1. In this case, both lenses 8, thanks to the prismatic modules 3, build images of object 1 on the photosensitive surfaces of solid-state receivers 5. In this case, each of the images is observed at an angle of view φ, the value of which is determined from the relation φ = arcctg (2S / d) where S is the working front segment, d is the stereoscopic base, which creates a stereoscopic effect It allows to visualize the image of the object 1 in a volume with a special monitor or glasses. To illuminate the object 1, a light guide fiber 10 can be used located in a channel isolated from the optoelectronic system of the device, or small-sized LEDs 11 installed in the distal part of the housing 7.

In a specific example of the technical implementation of a stereoscopic video endoscope with a distal tube diameter of 4 mm for use in minimally invasive surgery, where the front working segment S is 15 mm, the stereoscopic base d is 2.5 mm, the angle φ = arcctg (2S / d) is 5 degrees opposite sign for each channel.

Table 1 Specifications lenses. N Feature Name Value one Focal length mm 3.1862 2 Corner field hail. 20.0000 3 Aperture f / d number 9.0000

The technical result consists in obtaining an optoelectronic stereoscopic imaging system suitable for use in both rigid and flexible endoscopy. Lenses 8 allow you to get high-quality stereoscopic images without parallax at the working distance of the device S. Using these lenses 8 allows you to exclude from the design of the endoscope a complex, vulnerable and bulky mirror system deflecting the optical axes. The use of solid-state receivers in the form of small-sized CMOS arrays of the IntroSpicio ™ 120 model (http://www.medigus.com/camera_1_2mm/Camera.aspx) at the distal end of the endoscope allows you to completely abandon the complex, wrapping optical image translation system and prismatic modules for information and branching images. The lighting system of the endoscope can be made on the basis of a fiber guide placed in the space between the outer and inner cases, or using small distal LEDs.

Based on the foregoing, the claimed combination allows you to create a stereoscopic video endoscope with high image quality at a working distance by eliminating parallax while expanding the scope of its application due to the constructive implementation of the optical scheme suitable for use in both rigid and flexible endoscopy.

Claims (2)

1. A stereoscopic video endoscope comprising a housing in the distal part of which are two identical lenses, the optical axes of which are parallel in the image space, and two identical solid-state image receivers, each image receiver being located on the optical axis of the corresponding lens, characterized in that each lens is provided integrated frontal prismatic module, made in the form of a block of wedge-shaped prisms glued together and two lenses on the input and output surfaces block, and solid-state image receivers are installed behind each of the lenses in the distal part. 2. The stereoscopic video endoscope according to claim 1, characterized in that the solid-state image receiver is made in the form of a small-sized CMOS matrix.