A gynecological cervical cancer screening instrument

By setting up a transparent cover, diffusion membrane and annular lamp tube in the cervical cancer screening endoscope, the lighting range and intensity are increased, and cooling water is used to cool down, the problems of small lighting range and short lamp tube life in the prior art are solved, and screening efficiency and lamp tube life are improved.

CN113768456BActive Publication Date: 2025-03-11SHENZHEN XIZHEN TECHNOLOGY CO LTD
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Patent Information

Application Number
CN202111119893.8
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2021-09-24
Publication Date
2025-03-11
Estimated Expiration
2041-09-24

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Abstract

The present invention relates to the technical field of endoscopes, and specifically to a gynecological cervical cancer screening instrument, comprising a mainframe, a display screen, a handle, an endoscope hose, a control key, and a detection component, wherein the handle is arranged on one side outer surface of the mainframe, and an insertion tube interface is arranged on the other side outer surface of the mainframe, one end of the endoscope hose is sleeved with the insertion tube interface, the control key is arranged on the upper end outer surface of the handle, the display screen is arranged on the outer surface of the mainframe, and the detection component is arranged at one end of the endoscope hose away from the insertion tube interface. The present invention, by arranging a transparent cover, a diffusion film, and an annular lamp tube, can reliably emit illumination light with a large divergence angle, thereby increasing the illumination range and illumination intensity of the device, and further improving the clarity and accuracy of observing the inside of the cervical cavity during the screening process, and at the same time, by introducing a continuous flow of water into the water inlet pipe, the inside of the cavity can be cooled, thereby ensuring the service life of the lamp tube.
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Description

Technical Field

[0001] The present invention relates to the technical field of endoscopes, and in particular to a gynecological cervical cancer screening instrument. Background Art

[0002] Cervical cancer is the most common malignant tumor in the female reproductive system, and it is more common in middle-aged women. Screening for cervical cancer is conducive to early detection and early treatment. Endoscopes are widely used in the medical field and are an important instrument used in cervical cancer screening. During the endoscopic inspection, the doctor controls the scope to image the cavity. The imaging environment changes in real time, which will affect the stability of the image brightness. In order to obtain an image with ideal and stable brightness, it is necessary to process the image or adjust the light source.

[0003] The existing patent (application number: CN201920667369.6) is a rapid screening device for cervical cancer, including a protective cover and a main unit, wherein the protective cover is installed on the outside of the circumference of the main unit, a display screen is arranged inside the outer wall of the front end of the main unit, an insertion tube interface is arranged on the outer wall of the upper end of the main unit, an endoscope hose extending upward is sleeved inside the circumference of the insertion tube interface, a lens is arranged on the outer wall of the rear end of the endoscope hose, a charging port is arranged inside the outer wall of the right end of the main unit, a USB port is arranged on the main unit below the charging port, a handle is arranged on the outer wall of the lower end of the main unit, the finger ring is pinched by hand and rotated to the right through the rotating shaft and the rotating block, the block can block it, and then the finger is inserted into the finger ring for use, and if both hands need to be used during use, the finger ring can be placed on the desktop for viewing.

[0004] Although the above-mentioned rapid screening device for cervical cancer can only prevent the endoscope from slipping during the inspection, and can also be placed on the table for viewing through the ring, it still has the following shortcomings:

[0005] With the development of LED technology, LED has been gradually used for endoscope lighting due to its stable performance and long luminous time. In order to facilitate the detection of lesions, the area in the body cavity illuminated by the light source needs to match the field of view of the monitoring detection system as much as possible. The area of ​​the body cavity illuminated by the light is determined by the divergence angle of the light source. However, due to the narrow space at the front end of the endoscope, the existing lighting components have a small lighting range at one time, which affects the guidance of the endoscope hose and the screening efficiency.

[0006] In addition, the light-emitting element LED will generate a large amount of heat during the lighting process. If the heat is not dissipated in time, long-term use will cause the lamp to deteriorate, thereby reducing the life of the lamp.

[0007] Therefore, a gynecological cervical cancer screening instrument is proposed. Summary of the invention

[0008] The purpose of the present invention is to provide a gynecological cervical cancer screening instrument, which can reliably emit lighting light with a large divergence angle by arranging a transparent cover, a diffusion membrane and a ring-shaped lamp tube, thereby increasing the lighting range and lighting intensity of the device, and further improving the clarity and accuracy of observing the inside of the cervical cavity during the screening process. At the same time, by introducing a steady stream of water into the water inlet pipe, the interior of the cavity can be cooled, thereby ensuring the service life of the lamp tube, so as to solve the problems raised in the above-mentioned background technology.

[0009] To achieve the above-mentioned object, the present invention provides the following technical solutions: a gynecological cervical cancer screening instrument, comprising a mainframe, a display screen, a handle, an endoscope hose, a control key and a detection component, wherein the handle is arranged on one side outer surface of the mainframe, and an insertion tube interface is arranged on the other side outer surface of the mainframe, one end of the endoscope hose is sleeved with the insertion tube interface, the control key is arranged on the upper end outer surface of the handle, the display screen is arranged on the outer surface of the mainframe, and the detection component is arranged on one end of the endoscope hose away from the insertion tube interface;

[0010] The detection component includes a camera, a light tube, an insertion head and a transparent cover, and the insertion head is fixedly connected to the endoscope hose, and one end of the insertion head away from the endoscope hose is fixedly connected to the transparent cover, and a cavity is provided at the connection end between the insertion head and the transparent cover, and a connecting block is fixedly connected to the inner surface of the cavity near the middle, the camera is arranged on the outer surface of the connecting block, and a light tube is arranged on the outer surface of the connecting block, the cross-section of the light tube is annular, and an arc-shaped protrusion is arranged near the surrounding of the cavity surface and is fixedly connected to a diffusion membrane.

[0011] By adopting the above technical solution, using a transparent cover, a diffusion film and a ring-shaped lamp tube, it is possible to reliably emit lighting light with a large divergence angle, thereby increasing the lighting range and lighting intensity of the device, thereby improving the clarity and accuracy of observation of the inside of the cervical cavity during the screening process.

[0012] Preferably, the cross section of the transparent cover is fan-shaped, and it is composed of a transparent plate and a concave lens, and the position of the concave lens corresponds to the position of the lamp tube.

[0013] By adopting the above technical solution, during the screening process, by arranging the camera and the light tube inside the transparent cover, the camera's shooting range can be guaranteed, and the possibility of the camera directly contacting the inside of the cervix being blocked can be avoided. At the same time, by arranging a concave lens at a position corresponding to the light tube, it can cooperate with the diffusion film. After the light is scattered and evenly spread out on the surface of the diffusion film, the concave lens can diffuse the incident light by utilizing the characteristic of the concave lens to diffuse the light passing through the concave lens, thereby expanding the irradiation range of the light tube and improving the observation effect during the screening process. Moreover, the cross-section of the transparent cover is fan-shaped, which can maximize the irradiation range of the camera.

[0014] Preferably, a water inlet pipe and a water outlet pipe are respectively provided inside the insertion head near the upper and lower ends, and an annular water storage cavity is provided inside the insertion head near one end of the cavity, the inner surface of the annular water storage cavity is communicated with the inner surfaces of the water outlet pipe and the water inlet pipe, the water inlet pipe is located above the water outlet pipe, and the inner surfaces of the water inlet pipe and the water outlet pipe penetrate into the interior of the endoscope hose and are communicated with the outside.

[0015] By adopting the above technical scheme, during the screening process, the water inlet pipe is connected to the external water supply equipment, and a continuous flow of water is introduced into the water inlet pipe by controlling the state of the external water source, thereby achieving the ability to cool the interior of the cavity and ensure the service life of the lamp. During the screening process, the screening personnel introduce cooling water into the water inlet pipe, and the cooling water passes through the annular water storage cavity and flows out from the water outlet pipe, thereby cooling the interior of the cavity through the continuous flow of cooling water and ensuring the service life of the lamp.

[0016] Preferably, a notch is provided inside the annular water storage cavity on one side close to the cavity body, and an elastic membrane is fixedly connected to the inner surface of the notch, and the elastic membrane is made of medical silicone or medical rubber.

[0017] By adopting the above technical solution, during the screening process, the inside of the cavity is cooled down by the continuous flow of cooling water. At the same time, by setting an elastic membrane, when the detection component needs to be located at a certain position inside the cervical cavity, the screening personnel blocks the water outlet pipe and continues to input cooling water into the water inlet pipe. At this time, the elastic membrane expands outward due to the increase in the amount of water inside the cavity, thereby reducing the chance of the detection component shaking and ensuring the stability of the camera during shooting, thereby improving the accuracy of observation. In addition, the elastic membrane is subjected to the pressure of the cooling water, which provides certain support for the cervical cavity, thereby expanding the shooting range of the camera and improving the screening effect.

[0018] Preferably, the elastic membrane is arranged in an annular structure inside the annular water storage cavity, and its thickness increases from the highest point to the lowest point.

[0019] By adopting the above technical solution, during the screening process, the screening personnel introduce cooling water into the water inlet pipe, and the cooling water passes through the annular water storage cavity and flows out from the water outlet pipe, so that the inside of the cavity is cooled by the continuously flowing cooling water to ensure the service life of the lamp tube. At the same time, in this process, by setting the thickness of the elastic membrane to increase from the high point to the low point, the influence of the water pressure in the annular water storage cavity in a horizontal state combined with the gravity of the water body on the elastic membrane can be reduced, and the elastic membrane at the low point due to the water pressure combined with the weight of the water body is reduced. The elastic membrane has an uneven expansion degree at the high point and the low point due to the water pressure combined with the weight of the water body. The thickness of the elastic membrane is increased from the high point to the low point. The structural design is used, so that when water is injected into the annular water storage cavity and the water outlet pipe is closed at the same time, the elastic membrane can expand evenly under the water pressure of the cooling water, thereby better stabilizing the detection component, increasing the camera clarity, and the detection component will not rotate significantly when entering the cervix, so the offset of the water inlet pipe position is within the range that can ensure the uniform expansion of the elastic membrane.

[0020] Preferably, a first buffer plate is provided on both sides of the inner surface of the annular water storage chamber, and a second buffer plate is provided on the inner surface of the elastic membrane at a position corresponding to the first buffer plate, the second buffer plate is located above the first buffer plate, and the cross-sections of the first buffer plate and the second buffer plate are spiral.

[0021] By adopting the above technical solution, during the screening process, the elastic membrane expands outward due to the increase in the amount of water inside the cavity, thereby reducing the chance of shaking of the detection component and ensuring the stability of the camera during shooting, thereby improving the accuracy of observation. However, in the actual screening process, since the water inlet pipe is located above the water outlet pipe, when the water flow inside the cavity is less, the cooling water will continuously drip on the surface of the elastic membrane, thereby causing impact on the cervical cavity and causing discomfort to the patient. Therefore, by providing a spiral first buffer plate and a second buffer plate, the flow of cooling water can be effectively buffered and diverted, so that the cooling water flows slowly along the inner wall of the cavity, thereby reducing the discomfort of the patient during the screening process.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. By setting up a transparent cover, a diffusion film and a ring-shaped lamp tube, it can reliably emit illumination light with a large divergence angle, thereby increasing the illumination range and illumination intensity of the device, thereby improving the clarity and accuracy of observation of the inside of the cervical cavity during the screening process;

[0024] 2. At the same time, by introducing a steady stream of water into the water inlet pipe, the interior of the cavity can be cooled, thereby ensuring the service life of the lamp. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of the present invention;

[0026] Figure 2 A structural view of the detection assembly of the present invention;

[0027] Figure 3 For the present invention Figure 2 AA cross-sectional view;

[0028] Figure 4 For the present invention Figure 3 Enlarged view of C;

[0029] Figure 5 For the present invention Figure 3 A cross-sectional view of BB;

[0030] Figure 6 It is a structural view of the elastic membrane of the present invention.

[0031] In the figure: 1. main unit; 2. display screen; 3. handle; 4. endoscope hose; 5. control key; 6. detection component; 61. camera; 62. lamp tube; 63. insertion head; 64. transparent cover; 641. transparent plate; 642. concave lens; 65. cavity; 651. connecting block; 66. diffusion membrane; 67. water inlet pipe; 68. water outlet pipe; 69. annular water storage chamber; 691. elastic membrane; 692. first buffer plate; 693. second buffer plate; 7. insertion tube interface. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] See also Figures 1 to 6 , the present invention provides a technical solution:

[0034] A gynecological cervical cancer screening instrument, such as Figures 1 to 4 As shown, it includes a host 1, a display screen 2, a handle 3, an endoscope hose 4, a control key 5 and a detection component 6, the handle 3 is arranged on one side of the outer surface of the host 1, and the other side of the outer surface of the host 1 is provided with an insertion tube interface 7, one end of the endoscope hose 4 is sleeved with the insertion tube interface 7, the control key 5 is arranged on the upper end outer surface of the handle 3, the display screen 2 is arranged on the outer surface of the host 1, and the detection component 6 is arranged at one end of the endoscope hose 4 away from the insertion tube interface 7;

[0035] The detection component 6 includes a camera 61, a light tube 62, an insertion head 63 and a transparent cover 64, and the insertion head 63 is fixedly connected to the endoscope hose 4, and the end of the insertion head 63 away from the endoscope hose 4 is fixedly connected to the transparent cover 64, and a cavity 65 is provided at the connecting end of the insertion head 63 and the transparent cover 64, and a connecting block 651 is fixedly connected to the inner surface of the cavity 65 near the middle, the camera 61 is arranged on the outer surface of the connecting block 651, and the outer surface of the connecting block 651 is provided with a light tube 62, the cross-section of the light tube 62 is annular, and an arc-shaped protrusion is provided near the surrounding of the surface of the cavity 65 and a diffusion membrane 66 is fixedly connected.

[0036] By using the transparent cover 64, the diffusion film 66 and the ring-shaped lamp tube 62, during screening, the lamp tube 62 is turned on, and the light emitted by the lamp tube 62 is scattered on the surface of the diffusion film 66, and the light is spread softly and evenly, and can reliably emit lighting with a large divergence angle, thereby increasing the lighting range and lighting intensity of the device, and further improving the clarity and accuracy of the observation of the inside of the cervix during the screening process.

[0037] As an embodiment of the present invention, Figure 3 and Figure 4 As shown, the cross section of the transparent cover 64 is fan-shaped, and it is composed of a transparent plate 641 and a concave lens 642 . The position of the concave lens 642 corresponds to the position of the lamp tube 62 .

[0038] During the screening process, by arranging the camera 61 and the lamp tube 62 inside the transparent cover 64, the shooting range of the camera 61 can be ensured, and the possibility of the camera 61 being directly in contact with the inside of the cervix being obstructed can be avoided. At the same time, by arranging the concave lens 642 at a position corresponding to the lamp tube 62, it can cooperate with the diffusion film 66. After the light is scattered and evenly spread out on the surface of the diffusion film 66, the concave lens 642 can diffuse the incident light by utilizing the characteristic of the concave lens 642, so as to diffuse the light passing through the concave lens 642, thereby expanding the irradiation range of the lamp tube 62 and improving the observation effect during the screening process. In addition, the cross-section of the transparent cover 64 is fan-shaped, so that the irradiation range of the camera 61 can be maximized.

[0039] As an embodiment of the present invention, Figure 3 and Figure 4 As shown, a water inlet pipe 67 and a water outlet pipe 68 are respectively provided inside the insertion head 63 near the upper and lower ends, and an annular water storage chamber 69 is provided at one end of the insertion head 63 near the cavity 65, and the inner surface of the annular water storage chamber 69 is communicated with the inner surfaces of the water outlet pipe 68 and the water inlet pipe 67, and the water inlet pipe 67 is located above the water outlet pipe 68, and the inner surfaces of the water inlet pipe 67 and the water outlet pipe 68 penetrate into the interior of the endoscope hose 4 and communicate with the outside.

[0040] During the screening process, the water inlet pipe 67 is connected to the external water supply equipment, and a continuous flow of water is introduced into the water inlet pipe 67 by controlling the state of the external water source, so that the interior of the cavity 65 can be cooled to ensure the service life of the lamp tube 62. During the screening process, the screening personnel introduce cooling water into the water inlet pipe 67. The cooling water passes through the annular water storage cavity 69 and flows out from the water outlet pipe 68, so that the interior of the cavity 65 is cooled by the continuous flow of cooling water to ensure the service life of the lamp tube 62.

[0041] As an embodiment of the present invention, Figures 3 to 6 As shown, a notch is provided on one side of the annular water storage cavity 69 close to the cavity 65, and an elastic membrane 691 is fixedly connected to the inner surface of the notch. The elastic membrane 691 is made of medical silica gel or medical rubber.

[0042] During the screening process, the interior of the cavity 65 is cooled by a continuous flow of cooling water. At the same time, an elastic membrane 691 is provided. When the detection component 6 needs to be located at a certain position inside the cervical cavity, the screening personnel blocks the water outlet pipe 68 and continues to input cooling water into the water inlet pipe 67. At this time, the elastic membrane 691 expands outward due to the increase in the amount of water inside the cavity 65, thereby reducing the chance of the detection component 6 shaking and ensuring the stability of the camera 61 during the shooting process, thereby improving the accuracy of observation. In addition, the elastic membrane 691 is subjected to the pressure of the cooling water and provides certain support to the cervical cavity, thereby being able to expand the shooting range of the camera 61 and improving the screening effect.

[0043] As an embodiment of the present invention, Figure 6 As shown, the elastic membrane 691 is annular in structure and is disposed inside the annular water storage cavity 69, and its thickness increases from the highest point to the lowest point.

[0044] During the screening process, the screening personnel introduce cooling water into the water inlet pipe 67, and the cooling water passes through the annular water storage chamber 69 and flows out from the water outlet pipe 68, so that the interior of the cavity 65 is cooled by the continuously flowing cooling water to ensure the service life of the lamp tube 62. At the same time, in this process, by setting the thickness of the elastic membrane 691 to increase from the high point to the low point, the influence of the water pressure in the annular water storage chamber 69 in the horizontal state combined with the water body's own gravity on the elastic membrane 691 can be reduced, and the elastic membrane 691 at the low point due to the water pressure combined with the water body's weight can be reduced. The amount causes the elastic membrane 691 to have an uneven expansion degree at high points and low points. The elastic membrane 691 is designed with a thickness that increases from a high point to a low point. When water is injected into the annular water storage chamber 69 and the water outlet pipe 68 is closed at the same time, the elastic membrane 691 can expand evenly under the water pressure of the cooling water, thereby better stabilizing the detection component 6 and increasing the camera clarity. The detection component 6 will not rotate significantly when entering the cervix, so the offset of the position of the water inlet pipe 67 is within the range that can ensure the uniform expansion of the elastic membrane 691.

[0045] As an embodiment of the present invention, Figures 3 to 5 As shown, a first buffer plate 692 is provided on both sides of the inner surface of the annular water storage chamber 69, and a second buffer plate 693 is provided on the inner surface of the elastic membrane 691 at a position corresponding to the first buffer plate 692, the second buffer plate 693 is located above the first buffer plate 692, and the cross-sections of the first buffer plate 692 and the second buffer plate 693 are spiral.

[0046] During the screening process, the elastic membrane 691 expands outward due to the increase in the amount of water inside the cavity 65, thereby reducing the probability of the detection component 6 shaking and ensuring the stability of the camera 61 during the shooting process, thereby improving the accuracy of observation. However, during the actual screening process, since the water inlet pipe 67 is located above the water outlet pipe 68, when the water flow inside the cavity 65 is less, the cooling water will continuously drip on the surface of the elastic membrane 691, thereby causing impact on the cervical cavity and causing discomfort to the patient. Therefore, by providing a spiral first buffer plate 692 and a second buffer plate 693, the flow of cooling water can be effectively buffered and guided, so that the cooling water flows slowly along the inner wall of the cavity 65, thereby reducing the discomfort of the patient during the screening process.

[0047] Working principle: When in use, insert the endoscope hose 4 into the patient's cervix, adjust the control key 5, turn on the lamp 62, use the camera 61 to check whether there are any lesions inside the cervix, and take photos and videos. After the inspection is completed, unplug the endoscope hose 4, clean and disinfect it, and then put the device away. At the same time, by setting a concave lens 642 at a position corresponding to the lamp tube 62, it can cooperate with the diffusion film 66. After the light is scattered and evenly spread on the surface of the diffusion film 66, the concave lens 642 can diffuse the light passing through the concave lens 642 by using the characteristic of the incident light to diffuse, thereby expanding the irradiation range of the lamp tube 62 and improving the observation effect during the screening process;

[0048] During the screening process, the screening personnel introduce cooling water into the water inlet pipe 67. The cooling water passes through the annular water storage chamber 69 and flows out from the water outlet pipe 68, so that the interior of the cavity 65 is cooled by the continuously flowing cooling water to ensure the service life of the lamp tube 62. At the same time, by setting the elastic membrane 691, when the detection component 6 needs to be positioned inside the cervical cavity, the screening personnel blocks the water outlet pipe 68 and continues to input cooling water into the water inlet pipe 67. At this time, the elastic membrane 691 expands outward due to the increase in the amount of water inside the cavity 65, thereby reducing the chance of the detection component 6 shaking and ensuring the stability of the camera 61 during the shooting process, thereby improving the accuracy of observation. In addition, the elastic membrane 691 is subjected to the pressure of the cooling water and has a certain support for the cervical cavity, thereby being able to expand the shooting range of the camera 61 and improving the screening effect.

[0049] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A gynecological cervical cancer screening instrument, comprising a main unit (1), a display screen (2), a handle (3), an endoscope hose (4), a control key (5) and a detection component (6), characterized in that: The handle (3) is arranged on the outer surface of one side of the main unit (1), and the outer surface of the other side of the main unit (1) is provided with an insertion tube interface (7), one end of the endoscope hose (4) is sleeved with the insertion tube interface (7), the control key (5) is arranged on the upper outer surface of the handle (3), the display screen (2) is arranged on the outer surface of the main unit (1), and the detection component (6) is arranged on the end of the endoscope hose (4) away from the insertion tube interface (7); the detection component (6) comprises a camera (61), a light tube (62), an insertion head (63) and a transparent cover (64), and the insertion head (63) and the endoscope hose are connected to each other. (4) fixed connection, the end of the insertion head (63) away from the endoscope hose (4) is fixedly connected to the transparent cover (64), and a cavity (65) is provided at the connection end between the insertion head (63) and the transparent cover (64), a connection block (651) is fixedly connected to the inner surface of the cavity (65) near the middle, the camera (61) is arranged on the outer surface of the connection block (651), and a lamp tube (62) is arranged on the outer surface of the connection block (651), the cross section of the lamp tube (62) is annular, and a diffusion membrane (66) is fixedly connected to the surface of the cavity (65) near the periphery thereof; The cross section of the transparent cover (64) is fan-shaped, and it is composed of a transparent plate (641) and a concave lens (642), and the position of the concave lens (642) corresponds to the position of the lamp tube (62); A water inlet pipe (67) and a water outlet pipe (68) are respectively provided at positions near the upper and lower ends of the insertion head (63), and an annular water storage chamber (69) is provided at one end of the insertion head (63) near the cavity (65). The inner surface of the annular water storage chamber (69) is in communication with the inner surfaces of the water outlet pipe (68) and the water inlet pipe (67). The water inlet pipe (67) is located above the water outlet pipe (68), and the inner surfaces of the water inlet pipe (67) and the water outlet pipe (68) penetrate into the interior of the endoscope hose (4) and are in communication with the outside. A notch is provided on one side of the annular water storage cavity (69) close to the cavity (65), and an elastic membrane (691) is fixedly connected to the inner surface of the notch, wherein the elastic membrane (691) is made of medical silica gel or medical rubber; The elastic membrane (691) is arranged in an annular structure inside the annular water storage cavity (69), and its thickness increases from the highest point to the lowest point.

2. A gynecological cervical cancer screening instrument according to claim 1, characterized in that: A first buffer plate (692) is provided on both sides of the inner surface of the annular water storage chamber (69), and a second buffer plate (693) is provided on the inner surface of the elastic membrane (691) at a position corresponding to the first buffer plate (692), the second buffer plate (693) is located above the first buffer plate (692), and the cross-sections of the first buffer plate (692) and the second buffer plate (693) are spiral.

Citation Information

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