High-temperature and high-pressure resistant optical rigid tube endoscope

Abstract

The utility model relates to a kind of optical hard tube endoscopes of high temperature and high pressure resistance, including mirror body, optical assembly, stainless steel inner tube is equipped between mirror body and optical assembly, stainless steel middle tube, the rear end outside of optical assembly is equipped with eyepiece cavity sleeve, sapphire fixed steering head is equipped between the front end of stainless steel middle tube and optical assembly, sapphire window piece is equipped in the front end inside of sapphire fixed steering head, sapphire window piece, sapphire fixed steering head and optical assembly between filling full glue form first thick glue layer;The rear end of eyepiece cavity sleeve is equipped with sapphire exit window piece, sapphire exit window piece, eyepiece cavity sleeve and optical assembly between filling full glue form second thick glue layer.In the front and rear ends of hard tube endoscope, the scheme of filling full glue is used, and compared with mainstream sapphire metal brazing process, the process difficulty and cost greatly decline, and the use cost is greatly reduced;Meanwhile, the sealing cavity filled with glue has certain buffering property.

Description

Technical Field

[0001] This utility model relates to a high-temperature and high-pressure resistant optical rigid endoscope. Background Technology

[0002] An endoscope is a commonly used medical instrument, consisting of a tip, a curved section, an insertion section, an operating section, and a light guide. Its origins can be traced back to the mid-19th century; the world's first endoscope was created in 1853. Early endoscopes were mostly rigid tubes, used for rectal examinations, but their rigidity posed a significant risk of perforation. With technological advancements, endoscopic technology has developed rapidly, leading to the design of many different types and applications, such as laryngoscopes, ophthalmoscopes, and cystoscopes. Rigid medical endoscopes have gradually become an important medical examination tool and are widely used in various medical settings.

[0003] With the continuous advancement of medical technology, the requirements for endoscopes are becoming increasingly stringent, especially in situations requiring high-temperature and high-pressure sterilization. Traditional endoscopes use sapphire windows bonded to metal tubes with adhesive, leaving an air gap between the sapphire window and the first lens. This method often fails to meet the demands of high-temperature and high-pressure resistance. Therefore, medical high-temperature and high-pressure resistant rigid optical endoscopes have emerged. These endoscopes not only possess the functions of traditional endoscopes but also can operate stably and be sterilized under high-temperature and high-pressure environments, thereby improving the accuracy and safety of medical examinations. However, the current mainstream method still relies on fiber optic bonding of sapphire and metal to meet sealing and high-temperature and high-pressure performance requirements. This process is difficult and costly, making the development of a new type of high-temperature and high-pressure resistant rigid endoscope essential. Utility Model Content

[0004] This invention addresses the problems existing in the prior art by providing a high-temperature and high-pressure resistant optical rigid endoscope.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a high-temperature and high-pressure resistant optical rigid tube endoscope, comprising a mirror body and an optical component disposed inside the mirror body. A stainless steel inner tube and a stainless steel middle tube are sequentially arranged between the mirror body and the optical component from the inside out. An eyepiece cavity sleeve is fitted onto the outer rear end of the optical component. A cylindrical sapphire fixing and steering head is disposed between the front end of the stainless steel middle tube and the optical component. A sapphire window is disposed inside the front end of the sapphire fixing and steering head. The sapphire window, the sapphire fixing and steering head, and the optical component form a first sealed cavity, which is filled with adhesive to form a first thick adhesive layer. A sapphire exit window is disposed at the rear end of the eyepiece cavity sleeve. The sapphire exit window, the eyepiece cavity sleeve, and the optical component form a second sealed cavity, which is filled with adhesive to form a second thick adhesive layer.

[0006] Furthermore, the inner surface of the sapphire window and the lens surface at the foremost end of the optical component are both in contact with the adhesive; the inner surface of the sapphire exit window and the lens surface at the rearmost end of the optical component are both in contact with the adhesive.

[0007] Furthermore, the outer peripheral side of the sapphire fixed steering head is provided with a first limiting step, the step surface of the first limiting step is in contact with the front end face of the stainless steel middle tube; the outer peripheral side of the front end of the stainless steel inner tube is provided with a second limiting step, the rear end of the sapphire fixed steering head is located between the stainless steel middle tube and the stainless steel inner tube, and the rear end face of the sapphire fixed steering head is in contact with the step surface of the second limiting step.

[0008] Furthermore, the front end of the sapphire fixed steering head is provided with a first recess for accommodating a sapphire window plate, and the sapphire window plate is fixed to the bottom of the first recess by adhesive; the rear end of the eyepiece cavity sleeve is provided with a second recess for accommodating a sapphire exit window plate, and the sapphire exit window plate is fixed to the bottom of the second recess by adhesive.

[0009] Furthermore, the first lens of the optical component is an aspherical curved lens, and the surface of the lens is coated with an adhesive anti-reflection film; the surfaces of the sapphire window, the sapphire exit window, and the last lens of the optical component are also coated with an adhesive anti-reflection film.

[0010] Furthermore, the optical assembly includes a front optical group, a relay group, and a rear optical group arranged sequentially from front to back.

[0011] Further, in the front optical group of the optical component, the material of one lens is H-FK55 material, and this lens satisfies 1.3 < Nd < 1.7, 70 < Vd < 80; in the rear optical group of the optical component, the material of one lens is H-FK61 material, and this lens satisfies 1.3 < Nd < 1.7, 75 < Vd < 85, where Vd is the dispersion coefficient and Nd is the refractive index.

[0012] Further, both the first thick glue layer and the second thick glue layer are epoxy glue.

[0013] Further, a first elastic seal is provided between the optical component and the eyepiece cavity sleeve; an eyepiece is screwed to the outer side of the rear end of the eyepiece cavity sleeve, and a second elastic seal is provided between the eyepiece cavity sleeve and the eyepiece.

[0014] Compared with the prior art, the present utility model has the following effects: The present utility model adopts the scheme of filling glue at both the front and rear ends of the rigid endoscope, and its process difficulty and cost are greatly reduced compared with the mainstream sapphire metal brazing process, greatly reducing the use cost; at the same time, filling the sealing cavity with glue has a certain buffering property. When the rigid endoscope is subjected to an external impact force, the external force can be eliminated, avoiding conduction to the precision and fragile optical lenses, so as to achieve the purpose of protecting the optical imaging component, and there is no air in the sealing cavity, avoiding the generation of water vapor, thus preventing phenomena such as fogging. Description of the Drawings

[0015] Figure 1 is the overall structural schematic diagram of the embodiment of the present utility model;

[0016] Figure 2 is the structural schematic diagram of the first sealing cavity in the embodiment of the present utility model;

[0017] Figure 3 is the structural schematic diagram of the second sealing cavity in the embodiment of the present utility model;

[0018] Figure 4 is the optical structure diagram of the optical component in the embodiment of the present utility model;

[0019] Figure 5 is the partial schematic diagram of the front optical group in the embodiment of the present utility model;

[0020] Figure 6 is the schematic diagram of the rear optical group in the embodiment of the present utility model;

[0021] Figure 7 is the MTF index diagram of the embodiment of the present utility model;

[0022] Figure 8 is the distortion index diagram of the embodiment of the present utility model.

[0023] In the picture:

[0024] 1-Sapphire window; 2-Sapphire fixed steering head; 3-Stainless steel central tube; 4-Stainless steel inner tube; 5-Optical assembly; 6-First thick adhesive layer; 7-Lens body; 8-Eyepiece cavity sleeve; 9-Eyeclip; 10-Sapphire exit window; 11-Second thick adhesive layer; 12-Front optical group; 13-Relay group; 14-Rear optical group; 15-First lens; 16-Second lens; 17-Fourteenth lens; 18-First sealing cavity; 19-Second sealing cavity; 21-First limiting step; 22-Second limiting step; 23-First recess; 24-Second recess. Detailed Implementation

[0025] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0026] In the description of this utility model, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0027] like Figures 1-8As shown, this utility model discloses a high-temperature and high-pressure resistant optical rigid tube endoscope, aiming to meet the requirements for sterilization use with a simpler sealing and reliable process. Specifically, it includes a scope body 7 and an optical component 5 disposed inside the scope body 7. A stainless steel inner tube 4 and a stainless steel middle tube 3 are sequentially fitted between the scope body 7 and the optical component 5 from the inside out. The optical component 5 and the stainless steel inner tube 4 are fixed with adhesive. An eyepiece cavity sleeve 8 is fitted onto the outer rear end of the optical component 5. A cylindrical sapphire fixing and steering head 2 is disposed between the front end of the stainless steel middle tube 3 and the optical component 5. The front end of the lens has a sapphire window 1, which is sealed and bonded to the sapphire fixed steering head 2 with epoxy adhesive. The sapphire window 1, the sapphire fixed steering head 2, and the optical component 5 together form a first sealed cavity 18, which is filled with epoxy adhesive to form a first thick adhesive layer 6. The rear end of the eyepiece cavity sleeve 8 has a sapphire exit window 10, which, the eyepiece cavity sleeve 8, and the optical component 5 together form a second sealed cavity 19, which is filled with epoxy adhesive to form a second thick adhesive layer 11. The first and second thick adhesive layers have buffering properties. When the entire rigid tube is subjected to external impact, the thick adhesive layer will absorb and buffer the impact, thereby protecting the optical component. The thick adhesive layer completely expels air from the sealed cavity, preventing water vapor from forming in this area, thus avoiding fogging inside the lens.

[0028] In this embodiment, the inner surface of the sapphire window 1 and the frontmost lens surface of the optical component 5 are both in contact with the adhesive, and there is no air in between.

[0029] In this embodiment, the inner surface of the sapphire emission window 10 and the lens surface at the rear end of the optical component 5 are both in contact with the adhesive, and there is no air in between.

[0030] In this embodiment, a first limiting step 21 is provided on the outer peripheral side of the sapphire fixed steering head 2, and the step surface of the first limiting step 21 is in contact with the front end face of the stainless steel middle tube 3; a second limiting step 22 is provided on the outer peripheral side of the front end of the stainless steel inner tube 4, and the rear end of the sapphire fixed steering head 2 is located between the stainless steel middle tube 3 and the stainless steel inner tube 4, and the rear end face of the sapphire fixed steering head 2 is in contact with the step surface of the second limiting step 22, so as to ensure the installation position of the sapphire fixed steering head and the stainless steel middle tube 3.

[0031] In this embodiment, the front end of the sapphire fixed steering head 2 is provided with a first recess 23 for accommodating the sapphire window piece, and the sapphire window piece 1 is fixed to the bottom of the first recess 23 by adhesive.

[0032] In this embodiment, a second sink 24 for accommodating the sapphire exit window 10 is provided at the rear end of the eyepiece cavity sleeve 8, and the sapphire exit window 10 is fixedly bonded to the bottom of the second sink 24 with glue.

[0033] In this embodiment, the frontmost lens of the optical component 5 is an aspherical lens, which is used to correct the aberration and distortion introduced by the glue, and an antireflection coating for glue is deposited on the surface of this lens to meet the transmittance under the glue medium.

[0034] In this embodiment, an antireflection coating for glue is also deposited on the surface of the sapphire window 1, the surface of the sapphire exit window, and the surface of the last lens of the optical component 5 to meet the transmittance under the glue medium.

[0035] In this embodiment, the optical component 5 includes an optical front group 12, a relay group 13, and an optical rear group 14 arranged in sequence from front to back, specifically including a first lens, a second lens, a third lens, a fourth cemented lens, a fifth cemented lens, a sixth cemented lens, a seventh cemented rod lens, an eighth cemented rod lens, a ninth cemented rod lens, a tenth cemented rod lens, an eleventh cemented rod lens, a twelfth cemented rod lens, a thirteenth cemented lens, and a fourteenth lens.

[0036] In this embodiment, the parameters of each lens are shown in Table 1 below: where the focal length f of the entire optical system is 2.675 mm, a floating diaphragm is set for the aperture, the wavelength is set to 420 nm - 650 nm, and the field angle is set to 35°.

[0037]

[0038] In this embodiment, in the optical front group of the optical component 5, the material of one of the lenses is H-FK55 material, and this lens satisfies 1.3 < Nd < 1.7, 70 < Vd < 80, and is used to correct the aberration generated after the glue is introduced into the above-mentioned first sealed cavity.

[0039] In this embodiment, in the optical rear group of the optical component 5, the material of one of the lenses is H-FK61 material, and this lens satisfies 1.3 < Nd < 1.7, 75 < Vd < 85, where Vd is the dispersion coefficient and Nd is the refractive index, and is used to correct the aberration generated after the glue is introduced into the above-mentioned second sealed cavity.

[0040] In this embodiment, both the first thick glue layer and the second thick glue layer are epoxy glue, and the epoxy glue is a high-temperature resistant glue.

[0041] In this embodiment, the sealing glue between the sapphire window 1 and the sapphire fixed steering head 2 can be disassembled and assembled independently, realizing convenient replacement and repair.

[0042] In this embodiment, a first elastic seal is provided between the optical component 5 and the eyepiece cavity sleeve 8 to provide a sealing function.

[0043] In this embodiment, an eye mask 9 is screwed to the outer rear end of the eyepiece cavity sleeve 8, and a second elastic sealing element is provided between the eyepiece cavity sleeve 8 and the eye mask 9 to provide a sealing function.

[0044] In this embodiment, the rear end of the optical rigid endoscope is provided with a virtual lens that simulates a bayonet, and its focal length f=18mm.

[0045] In this embodiment, Figure 7 For MTF effect, Figure 8 The distortion effect is shown in the figure, which indicates that it meets the imaging requirements.

[0046] The advantages of this utility model are:

[0047] (1) Both the front and rear ends are filled with glue. The process difficulty and cost are greatly reduced compared with the mainstream sapphire metal soldering process, which greatly reduces the cost of use. However, since the introduction of glue will cause aberrations, this utility model optimizes the optical imaging scheme for this purpose. By adopting the above structure, the aberrations and distortions caused by the introduction of glue can be effectively corrected.

[0048] (2) Both the front and rear sealing cavities are filled with glue, which has a certain buffering capacity. When the rigid tube lens is subjected to external impact, it can eliminate the external force and prevent it from being transmitted to the delicate and fragile optical lens, so as to protect the optical imaging components. At the same time, the sealing cavity is free of air, which prevents the generation of water vapor, thus preventing fogging and other phenomena.

[0049] (3) It effectively solves the problems of complex welding and sealing process, high cost and low yield of high temperature and high pressure hard endoscopes; the sealing scheme and optical scheme have been optimized to meet the use requirements of hard endoscopes and will be able to replace traditional high temperature and high pressure hard endoscopes.

[0050] If this utility model discloses or relates to mutually fixedly connected parts or structural components, then unless otherwise stated, a fixed connection can be understood as: a detachable fixed connection (e.g., using bolts or screws), or a non-detachable fixed connection (e.g., riveting, welding). Of course, mutually fixed connections can also be replaced by an integral structure (e.g., manufactured by integral molding using a casting process) (except where it is obviously impossible to use an integral molding process).

[0051] In addition, unless otherwise stated, the terms used to indicate positional relationships or shapes in any of the technical solutions disclosed in this utility model above include states or shapes that are similar to, close to, or approximate with them.

[0052] Any component provided by this utility model can be assembled from multiple individual components, or it can be a single component manufactured by a one-piece molding process.

[0053] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and not to limit it; although the utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of this utility model or equivalent substitutions can be made to some technical features without departing from the spirit of the technical solution of this utility model, and all such modifications and substitutions should be covered within the scope of the technical solution claimed by this utility model.

Claims

1. A high-temperature and high-pressure resistant optical rigid endoscope, comprising an endoscope body and an optical assembly disposed inside the endoscope body, wherein a stainless steel inner tube and a stainless steel middle tube are sequentially disposed between the endoscope body and the optical assembly from the inside to the outside, and an eyepiece cavity sleeve is sleeved on the outer rear end of the optical assembly, characterized in that: A cylindrical sapphire fixing and steering head is provided between the front end of the stainless steel tube and the optical component. A sapphire window is provided inside the front end of the sapphire fixing and steering head. The sapphire window, the sapphire fixing and steering head and the optical component form a first sealed cavity. The first sealed cavity is filled with glue to form a first thick adhesive layer. A sapphire exit window is provided at the rear end of the eyepiece cavity sleeve. The sapphire exit window, the eyepiece cavity sleeve and the optical component form a second sealed cavity. The second sealed cavity is filled with glue to form a second thick adhesive layer.

2. The high-temperature and high-pressure resistant optical rigid endoscope according to claim 1, characterized in that: The inner surface of the sapphire window and the frontmost lens surface of the optical component are both in contact with the adhesive; the inner surface of the sapphire exit window and the rearmost lens surface of the optical component are both in contact with the adhesive.

3. The high-temperature and high-pressure resistant optical rigid endoscope according to claim 1, characterized in that: The outer peripheral side of the sapphire fixed steering head is provided with a first limiting step, the step surface of the first limiting step is in contact with the front end face of the stainless steel middle tube; the outer peripheral side of the front end of the stainless steel inner tube is provided with a second limiting step, the rear end of the sapphire fixed steering head is located between the stainless steel middle tube and the stainless steel inner tube, and the rear end face of the sapphire fixed steering head is in contact with the step surface of the second limiting step.

4. The high-temperature and high-pressure resistant optical rigid endoscope according to claim 1, characterized in that: The front end of the sapphire fixed steering head is provided with a first recess for accommodating a sapphire window plate, and the sapphire window plate is fixed to the bottom of the first recess by adhesive. The rear end of the eyepiece cavity sleeve is provided with a second recess for accommodating a sapphire exit window plate, and the sapphire exit window plate is fixed to the bottom of the second recess by adhesive.

5. The high-temperature and high-pressure resistant optical rigid endoscope according to claim 1, characterized in that: The first lens of the optical component is an aspherical curved lens, and the surface of the lens is coated with an adhesive anti-reflection film; the surfaces of the sapphire window, the sapphire exit window, and the last lens of the optical component are also coated with an adhesive anti-reflection film.

6. The high-temperature and high-pressure resistant optical rigid endoscope according to claim 1, characterized in that: The optical components include a front optical group, a relay group, and a rear optical group arranged sequentially from front to back.

7. A high-temperature and high-pressure resistant optical rigid endoscope according to claim 6, characterized in that: In the front optical group of the optical assembly, one lens is made of H-FK55 material, and the lens satisfies 1.3 < Nd < 1.7 and 70 < Vd < 80; in the rear optical group of the optical assembly, one lens is made of H-FK61 material, and the lens satisfies 1.3 < Nd < 1.7 and 75 < Vd < 85, where Vd is the dispersion coefficient and Nd is the refractive index.

8. The high-temperature and high-pressure resistant optical rigid endoscope according to claim 1, characterized in that: Both the first and second thick adhesive layers are epoxy resins.

9. A high-temperature and high-pressure resistant optical rigid endoscope according to claim 1, characterized in that: A first elastic seal is provided between the optical component and the eyepiece cavity sleeve; an eye shield is screwed to the outer rear end of the eyepiece cavity sleeve, and a second elastic seal is provided between the eyepiece cavity sleeve and the eye shield.

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