Intelligent endoscope system and equipment thereof

Through the modular design of the intelligent endoscope system and the innovative structure of the camera components, the inconvenience and accidental touch problems in multi-angle shooting and control of the endoscope system have been solved, achieving high-quality image processing and stable operation, and reducing the mental burden on staff.

CN121242453APending Publication Date: 2026-01-02YINGFEISHI (FOSHAN) MEDICAL EQUIPMENT CO LTD
View PDF 0 Cites 0 Cited by

Patent Information

Application Number
CN202511629622.5
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-11-08
Publication Date
2026-01-02

AI Technical Summary

Technical Problem

Existing endoscope systems are inconvenient to use during multi-angle imaging and control, and are prone to accidental activation, leading to excessive mental stress on staff.

Method used

The system employs an intelligent endoscope system, including a control module, an image acquisition module, an image processing module, an auxiliary module, a data storage module, and a cleaning and disinfection module. Combined with camera components and switching components, it integrates images from multiple cameras and uses a rotary knob and gear structure to prevent accidental touches, achieving precise switching and stable control of the cameras.

Benefits of technology

It improves image quality and model construction accuracy, reduces accidental operation, lowers the mental burden on staff, and enhances the operational stability and convenience of the endoscope system.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure CN121242453A_ABST
    Figure CN121242453A_ABST
Patent Text Reader

Abstract

The invention discloses an intelligent endoscope system and equipment thereof, and belongs to the technical field of endoscope systems.The intelligent endoscope system comprises a control module, an image acquisition module, an image processing module, an auxiliary module, a data storage module and a cleaning and disinfecting module; the plurality of cameras are arranged in the outer tube, the plurality of cameras synchronously move at the beginning, the system integrates and analyzes the images shot by all the cameras to improve the quality of the images, and when the same object needs to be observed from multiple angles, the shooting directions can be switched by controlling the movement of the single camera, so that the observation efficiency is improved. And by arranging the switching assembly, when a worker does not need to operate the camera shooting assembly, control can be cut off through rotation, and rotation of the gear can be limited through the limiting assembly, so that the worker is prevented from mistakenly touching the rotary button.
Need to check novelty before this filing date? Find Prior Art

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of endoscope systems, more particularly, to an intelligent endoscope system and equipment thereof. BACKGROUND

[0002] An endoscope is an instrument for observing internal organs of a human body and internal structures of equipment, which is used in medical treatment, equipment maintenance and rescue. The endoscope is composed of a viewing head, a moving rod, a controller and a display.

[0003] In the current commonly used endoscope system, image observation is mostly performed by one viewing head. Although the camera device on the viewing head can rotate 360 degrees for multi-angle shooting, it is still inconvenient to simultaneously perform multi-angle shooting on an object. In addition, the endoscope often needs to be kept in one place for detailed observation during use, and the control device of the endoscope may be mistakenly touched. Especially when the endoscope system moves in the human body, the worker not only needs to exert great effort to control the movement of the viewing head, but also needs to prevent the control device from being mistakenly touched, which will cause great mental load to the worker. SUMMARY

[0004] The present application aims to provide an intelligent endoscope system and equipment thereof to solve the problems in the background art.

[0005] An intelligent endoscope system, comprising a control module, an image acquisition module, an image processing module, an auxiliary module, a data storage module and a cleaning and disinfecting module.

[0006] The control module is used to control the movement of the endoscope during use.

[0007] The image acquisition module is used to shoot a designated object.

[0008] The image processing module processes images based on the photos shot by the image acquisition module.

[0009] The auxiliary module is used to provide other auxiliary shooting functions during use of the equipment.

[0010] The data storage module is used to store and record the photos shot by the user, so that the worker can analyze the result changes later.

[0011] The cleaning and disinfecting module is associated with a cleaning equipment and is used to clean the endoscope.

[0012] Preferably, the image processing module comprises an analysis module, a model construction module and a real object comparison module.

[0013] The analysis module is responsible for pre-processing the image, improving the quality of the image;

[0014] The model construction module is responsible for constructing a three-dimensional model according to the pre-processed image, facilitating subsequent model comparison;

[0015] The physical comparison module is responsible for comparing the photographed image with the model, and timely modifying the model according to the feedback of the staff, preventing the model construction error from affecting the judgment of the staff.

[0016] Through the model construction module, the staff can intuitively feel the image, and through the physical comparison module, the staff can timely find the difference between the model construction and the actual situation, improve the accuracy of the model, and the model can also facilitate subsequent teaching work.

[0017] Preferably, the auxiliary module includes a light source module, a camera module, a positioning module and an element switching module;

[0018] The light source module is responsible for selecting different light sources according to the actual needs, which can reduce the damage of the device light source to the working environment, and also can increase the shooting effect of the image;

[0019] The camera module is responsible for selecting different cameras and control lines according to the actual needs;

[0020] The positioning module is responsible for tracking the position and direction of the endoscope, facilitating the staff to accurately guide the endoscope to the target area;

[0021] The element switching module is connected with the tools on the endoscope system, facilitating the staff to select appropriate tools for operation.

[0022] An intelligent endoscope device, comprising a bottom plate, characterized in that: the upper end of the bottom plate is fixedly connected with a switching assembly, one side of the switching assembly is fixedly connected with a connecting plate, the upper end of the connecting plate is provided with a control panel, the side of the control panel away from the switching assembly is provided with an auxiliary operation panel, and one side of the bottom plate is fixedly connected with a camera assembly.

[0023] Preferably, the camera assembly includes an outer tube fixedly connected to the base plate, and several cameras are movably arranged inside the outer tube. A limit tube is provided between the outer tube and the cameras, and the limit tube is fixedly connected to the outer tube. By setting multiple cameras, when the camera assembly moves, the system will recognize and integrate the images captured by all cameras, thereby improving the accuracy of the images. When it is necessary to observe the same object from multiple angles, the shooting position can be switched by controlling the movement of a single camera, thereby increasing the accuracy of model construction and facilitating the analysis of the scene by the staff.

[0024] Preferably, the switching component includes a connecting plate fixedly connected to the base plate. Several indicator lights are fixedly connected to the upper end of the connecting plate, with one more indicator light than the number of cameras. A rotary knob is rotatably connected to the center of the connecting plate. An indicator needle is fixedly connected to the end of the rotary knob away from the connecting plate, and the indicator needle passes through the connecting plate. A limit component is provided at the upper end of the connecting plate. A sliding groove is provided inside the connecting plate. Each indicator light corresponds to one camera, and the multiple indicator lights correspond to the entire device. The operator can determine the current control element by observing the indicator lights.

[0025] Preferably, a gear is fixedly connected to the end of the rotary knob away from the indicator needle. A gear meshes with the outer side of the gear, and the gear is in contact with the limiting component. A connecting block is fixedly connected to one side of the gear, and an electromagnet is fixedly connected to the end of the connecting block away from the gear. The electromagnet is slidably connected to the slide groove. Several electromagnets are provided on the connecting plate, and the electromagnets correspond to the positions of the indicator lights. By rotating the gear, the gear can be rotated once to disconnect the connection, and then rotated again to switch to the next working element. This cycle repeats. When the operator does not need to operate the camera component, the control can be disconnected by rotating the knob to prevent accidental operation. The limiting component also prevents the operator from accidentally touching the rotary knob.

[0026] Preferably, the limiting component includes a protective shell fixedly connected to the connecting plate, a movable block slidably connected inside the protective shell, a connecting plate fixedly connected to one end of the movable block, a locking block fixedly connected to the end of the connecting plate near the indicator needle, a limiting post fixedly connected to the end of the movable block away from the connecting plate, a spring provided on the outer side of the limiting post, one side of the spring fixedly connected to the movable block, and the end of the spring away from the movable block fixedly connected to the protective shell.

[0027] Preferably, a limiting post is provided on the inner side of the end of the spring away from the limiting post, the limiting post is fixedly connected to the protective shell, a fixing post is fixedly connected to the end of the protective shell near the locking block, a sliding groove is provided inside the moving block, a sliding rod is slidably connected to the sliding groove, a connecting rod is rotatably connected between the sliding rod and the fixing post, a pressing rod is fixedly connected to the end of the moving block near the indicator needle, the pressing rod passes through the protective shell, and a pressing block is fixedly connected to the end of the pressing rod away from the protective shell, the pressing block being located above the connecting plate.

[0028] Compared with the prior art, the advantages of this invention are:

[0029] 1. In this invention, by setting up an image processing module, the image quality can be effectively improved by preprocessing the image, thereby increasing the accuracy of model construction. At the same time, by comparing the model with the real object, the staff can also intuitively compare the model with the real object when analyzing the model, preventing the impact of model construction errors on subsequent work, and also enabling timely modification of the model.

[0030] 2. In this invention, by setting up a camera component, multiple cameras are set up inside the outer tube. Initially, the multiple cameras move synchronously. The system integrates and analyzes the images captured by all the cameras to improve the image quality. When it is necessary to observe the same object from multiple angles, the shooting position can be switched by controlling the movement of a single camera, thereby increasing the accuracy of model construction and facilitating the analysis of the scene by the staff.

[0031] 3. In this invention, by setting a switching component, rotating the rotary knob can control electromagnet one to contact different electromagnets, thereby switching between different cameras for subsequent control. Furthermore, the rotation of gear one is limited by a gear, so that rotating gear one once from the initial state disconnects the connection, and rotating it again switches to the next working element, and so on. When the operator does not need to operate the camera component, the control can be disconnected by rotating the knob, preventing accidental operation. In addition, the rotation of the gear can be limited by the limiting component to prevent the operator from accidentally touching the rotary knob, ensuring the stability of the device when it does not need to be moved. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the modules in the overall system design of the present invention;

[0033] Figure 2 This is a schematic diagram of the overall structure of the present invention;

[0034] Figure 3 This is a schematic diagram of the camera assembly of the present invention;

[0035] Figure 4 This is a schematic diagram of the switching component of the present invention;

[0036] Figure 5 This is another view of the structure of the switching component of the present invention;

[0037] Figure 6 This is a schematic diagram of the limiting component of the present invention;

[0038] Figure 7 This is another perspective view of the structure of the limiting component of the present invention.

[0039] The following are the labeling instructions in the diagram: 1. Base plate; 2. Camera assembly; 201. Outer tube; 202. Camera; 203. Limiting tube; 3. Switching assembly; 301. Rotary knob; 302. Indicator light; 303. Indicator needle; 304. Connecting plate; 305. Gear; 306. Electromagnet; 307. Electromagnet one; 308. Connecting block; 309. Gear one; 310. Limiting assembly; 311. Slide groove; 312. Press block; 313. Press rod; 314. Locking block; 315. Protective shell; 316. Connecting plate one; 317. Moving block; 318. Connecting rod; 319. Spring; 320. Limiting post; 321. Limiting post one; 322. Fixing post; 323. Sliding groove; 324. Sliding rod; 4. Control panel; 5. Auxiliary operation panel; 6. Connecting plate. Detailed Implementation

[0040] Example: Please refer to Figure 1 An intelligent endoscope system, comprising a control module, an image acquisition module, an image processing module, an auxiliary module, a data storage module, and a cleaning and disinfection module;

[0041] The control module is used to control the movement of the endoscope during use;

[0042] The image acquisition module is used to capture images of a specified object;

[0043] The image processing module processes the image based on the photograph taken by the image acquisition module;

[0044] The auxiliary module is used to provide additional auxiliary shooting functions when the device is in use;

[0045] The data storage module is used to store and record photos taken by the user;

[0046] The cleaning and disinfection module is associated with the cleaning equipment and is used to clean the endoscope.

[0047] Please see Figure 1The image processing module includes an analysis module, a model building module, and a physical object comparison module;

[0048] The analysis module is responsible for image preprocessing;

[0049] The model building module is responsible for building a 3D model based on the preprocessed image;

[0050] The physical comparison module is responsible for comparing the captured images with the model.

[0051] Specifically, the model building module allows staff to intuitively perceive the images, while the physical object comparison module helps staff to promptly identify differences between the model and reality, improving the accuracy of the model. In addition, the model can also facilitate subsequent teaching work.

[0052] Please see Figure 1 The auxiliary module includes a light source module, a camera module, a positioning module, and a component switching module;

[0053] The light source module is responsible for selecting different light sources according to the actual needs.

[0054] The camera module is responsible for selecting different cameras and control cables according to the actual needs.

[0055] The positioning module is responsible for tracking the position and orientation of the endoscope, making it easier for staff to accurately guide the endoscope to the target area;

[0056] The component switching module connects to the tools on the endoscope system, making it easier for staff to select the appropriate tools for operation.

[0057] Please see Figure 2 An intelligent endoscope device includes a base plate 1, a switching component 3 fixedly connected to the upper end of the base plate 1, a connecting plate 6 fixedly connected to one side of the switching component 3, a control panel 4 disposed on the connecting plate 6, an auxiliary operation panel 5 disposed on the side of the control panel 4 away from the switching component 3, and a camera component 2 fixedly connected to one side of the base plate 1.

[0058] Please see Figure 3 The camera assembly 2 includes an outer tube 201 fixedly connected to the base plate 1. Several cameras 202 are movably arranged inside the outer tube 201. A limit tube 203 is provided between the outer tube 201 and the cameras 202. The limit tube 203 is fixedly connected to the outer tube 201. By setting multiple cameras 202, when the cameras 202 move as a whole, the system will recognize and integrate the images captured by all the cameras 202, thereby improving the accuracy of the images. When it is necessary to observe the same object from multiple angles, the shooting position can be switched by controlling the movement of a single camera 202, thereby increasing the accuracy of model construction and facilitating the analysis of the scene by the staff.

[0059] Please see Figure 4 and Figure 5 The switching component 3 includes a connecting plate 304 fixedly connected to the base plate 1. Several indicator lights 302 are fixedly connected to the upper end of the connecting plate 304. The number of indicator lights 302 is one more than the number of cameras 202. A rotary knob 301 is rotatably connected to the center of the connecting plate 304. An indicator needle 303 is fixedly connected to the end of the rotary knob 301 away from the connecting plate 304. The indicator needle 303 passes through the connecting plate 304. A limit component 310 is provided at the upper end of the connecting plate 304. A sliding groove 311 is provided inside the connecting plate 304. Each indicator light 302 corresponds to one camera 202, and the multiple indicator lights 302 correspond to the overall device. The operator can observe the indicator lights 302 to determine the current control element.

[0060] Please see Figure 4 and Figure 5 A gear 309 is fixedly connected to the end of the rotary knob 301 away from the indicator needle 303. A gear 305 meshes with the outer side of the gear 309. The gear 305 is in contact with the limiting component 310. A connecting block 308 is fixedly connected to one side of the gear 309. An electromagnet 307 is fixedly connected to the end of the connecting block 308 away from the gear 309. The electromagnet 307 is slidably connected to the slide groove 311. Several electromagnets 306 are provided on the connecting plate 304. The electromagnets 306 correspond to the positions of the indicator light 302. By rotating the gear 305 and the gear 309, the gear 309 rotates once from the initial state to disconnect the connection. Rotating it again switches to the next working element. This cycle repeats. When the operator does not need to operate the camera component 2, the control can be disconnected by rotating the knob to prevent accidental operation. The limiting component 310 can also prevent the operator from accidentally touching the rotary knob 301.

[0061] Specifically, in the initial state of use, the operator can control the entire camera assembly 2 to perform corresponding operations. When the operator needs to photograph the same object from multiple angles, they can rotate the rotary knob 301. When the rotary knob 301 rotates, it drives the gear 309 to rotate synchronously, which in turn causes the connecting block 308 to drive the electromagnet 307 to rotate, causing the electromagnet 307 to disconnect from the initial electromagnet 306. When the electromagnet 306 rotates to contact any of the electromagnets 306, the operator can control... The electromagnet 306 corresponds to the camera 202, and the operator can identify the controlled element according to the indicator light 302 of the indicator needle 303. Through the rotation of the gear 305 and the fine gear 309, the gear 309 rotates once from the initial state to disconnect, and rotates again to switch to the next working element, and so on. When the operator does not need to operate the camera component 2, the control can be disconnected by rotating, preventing accidental operation. The limit component 310 can also prevent the operator from accidentally touching the rotary knob 301.

[0062] Please see Figure 6 and Figure 7 The limiting component 310 includes a protective shell 315 fixedly connected to the connecting plate 304. A movable block 317 is slidably connected inside the protective shell 315. A connecting plate 316 is fixedly connected to one end of the movable block 317. A locking block 314 is fixedly connected to one end of the connecting plate 316 near the indicator needle 303. A limiting post 321 is fixedly connected to one end of the movable block 317 away from the connecting plate 316. A spring 319 is provided on the outside of the limiting post 321. One side of the spring 319 is fixedly connected to the movable block 317. The end of the spring 319 away from the movable block 317 is fixedly connected to the protective shell 315.

[0063] Please see Figure 6 and Figure 7 A limit post 320 is provided on the inner side of the end of the spring 319 away from the limit post 321. The limit post 320 is fixedly connected to the protective shell 315. A fixed post 322 is fixedly connected to the end of the protective shell 315 near the locking block 314. A sliding groove 323 is provided inside the moving block 317. A sliding rod 324 is slidably connected to the sliding groove 323. A connecting rod 318 is rotatably connected between the sliding rod 324 and the fixed post 322. A pressing rod 313 is fixedly connected to the end of the moving block 317 near the indicator needle 303. The pressing rod 313 passes through the protective shell 315. A pressing block 312 is fixedly connected to the end of the pressing rod 313 away from the protective shell 315. The pressing block 312 is located above the connecting plate 304.

[0064] Specifically, when the actuating block 312 is pressed, the actuating block 312 will drive the actuating rod 313 to move downwards synchronously. The downward movement of the actuating rod 313 will drive the moving block 317 to move synchronously. The movement of the moving block 317 causes the sliding rod 324 to slide on the sliding groove 323. When the actuating block 312 completes one press, the sliding rod 324 will be locked on the sliding groove 323. At this time, the moving block 317 has moved downwards a certain distance from its initial position, so that the locking block 314 can be embedded in the gear 305 to restrict the rotation of the gear 305, thereby preventing the operator from accidentally touching the gear 305. When the actuating block 312 is pressed again, the moving block 317 will be reset under the action of the spring 319, without affecting the normal operation of the device.

[0065] Working principle of this invention: In the initial state of use, the operator can control the entire camera assembly 2 and perform corresponding operations. When the operator needs to photograph the same object from multiple angles, they can rotate the rotary knob 301. When the rotary knob 301 rotates, it drives the gear 309 to rotate synchronously, which in turn causes the connecting block 308 to drive the electromagnet 307 to rotate, causing the electromagnet 307 to disconnect from the initial electromagnet 306. When the electromagnet 306 rotates to contact any other electromagnet 306, the operator can control the camera 202 corresponding to that electromagnet 306. The operator can identify the controlled element according to the indicator light 302 of the indicator needle 303. Through the rotation of the gear 305 and the fine gear 309, the gear 309 rotates once from the initial state to disconnect, and rotates again to switch to the next working element, and so on. When the operator needs to insert the endoscope... To prevent accidental activation during more detailed observation, the control can be disconnected by rotating the rotary knob 301. The limiting component 310 also prevents accidental activation of the rotary knob 301. When the push block 312 is pressed, it moves the push rod 313 downwards, which in turn moves the moving block 317. The moving block 317 causes the sliding rod 324 to slide on the sliding groove 323. When the push block 312 completes one press, the sliding rod 324 is engaged in the sliding groove 323. At this point, the moving block 317 has moved downwards from its initial position, allowing the locking block 314 to engage with the gear 305, restricting its rotation and preventing accidental activation. When the push block 312 is pressed again, the moving block 317 resets under the action of the spring 319, without affecting the normal operation of the device.

[0066] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. An intelligent endoscope system, characterized in that: The intelligent endoscope system includes a control module, an image acquisition module, an image processing module, an auxiliary module, a data storage module, and a cleaning and disinfection module. The control module is used to control the movement of the endoscope during use; The image acquisition module is used to capture images of a specified object; The image processing module processes the image based on the photograph taken by the image acquisition module; The auxiliary module is used to provide additional auxiliary shooting functions when the device is in use; The data storage module is used to store and record photos taken by the user; The cleaning and disinfection module is associated with the cleaning equipment and is used to clean the endoscope.

2. The intelligent endoscope system according to claim 1, characterized in that: The image processing module includes an analysis module, a model building module, and a physical object comparison module; The analysis module is responsible for image preprocessing; The model building module is responsible for building a 3D model based on the preprocessed image; The physical object comparison module is responsible for comparing the captured images with the model.

3. The intelligent endoscope system according to claim 1, characterized in that: The auxiliary module includes a light source module, a camera module, a positioning module, and a component switching module; The light source module is responsible for selecting different light sources according to actual needs; The camera module is responsible for selecting different cameras and control lines according to actual needs; The positioning module is responsible for tracking the position and orientation of the endoscope; The component switching module is connected to the tools on the endoscope system and is responsible for switching to the appropriate tool for operation.

4. An intelligent endoscope device, comprising a base plate (1), characterized in that: A switching component (3) is fixedly connected to the upper end of the base plate (1), a connecting plate (6) is fixedly connected to one side of the switching component (3), a control panel (4) is provided on the connecting plate (6), an auxiliary operation panel (5) is provided on the side of the control panel (4) away from the switching component (3), and a camera component (2) is fixedly connected to one side of the base plate (1).

5. The intelligent endoscope device according to claim 4, characterized in that: The camera assembly (2) includes an outer tube (201) fixedly connected to the base plate (1). Several cameras (202) are movably arranged inside the outer tube (201). A limiting tube (203) is provided between the outer tube (201) and the cameras (202), and the limiting tube (203) is fixedly connected to the outer tube (201).

6. The intelligent endoscope device according to claim 4, characterized in that: The switching component (3) includes a connecting plate (304) fixedly connected to the base plate (1). Several indicator lights (302) are fixedly connected to the upper end of the connecting plate (304). A rotary knob (301) is rotatably connected to the center of the connecting plate (304). An indicator needle (303) is fixedly connected to the end of the rotary knob (301) away from the connecting plate (304). The indicator needle (303) passes through the connecting plate (304). A limit component (310) is provided at the upper end of the connecting plate (304). A sliding groove (311) is provided inside the connecting plate (304).

7. The intelligent endoscope device according to claim 6, characterized in that: A gear (309) is fixedly connected to one end of the rotary knob (301) away from the indicator needle (303). A gear (305) meshes with the outer side of the gear (309). The gear (305) is in contact with the limiting component (310). A connecting block (308) is fixedly connected to one side of the gear (309). An electromagnet (307) is fixedly connected to one end of the connecting block (308) away from the gear (309). The electromagnet (307) is slidably connected to the slide groove (311). Several electromagnets (306) are provided on the connecting plate (304). The electromagnets (306) correspond to the positions of the indicator light (302).

8. The intelligent endoscope device according to claim 7, characterized in that: The limiting component (310) includes a protective shell (315) fixedly connected to the connecting plate (304). A movable block (317) is slidably connected inside the protective shell (315). A connecting plate (316) is fixedly connected to one end of the movable block (317). A locking block (314) is fixedly connected to one end of the connecting plate (316) near the indicator needle (303). A limiting post (321) is fixedly connected to one end of the movable block (317) away from the connecting plate (316). A spring (319) is provided on the outside of the limiting post (321). One side of the spring (319) is fixedly connected to the movable block (317). The end of the spring (319) away from the movable block (317) is fixedly connected to the protective shell (315).

9. The intelligent endoscope device according to claim 8, characterized in that: A limiting post (320) is provided on the inner side of the end of the spring (319) away from the limiting post (321). The limiting post (320) is fixedly connected to the protective shell (315). A fixing post (322) is fixedly connected to the end of the protective shell (315) near the locking block (314). A sliding groove (323) is provided inside the moving block (317). A sliding rod (324) is slidably connected to the sliding groove (323). (324) A connecting rod (318) is rotatably connected to the fixed column (322). A push rod (313) is fixedly connected to one end of the moving block (317) near the indicator needle (303). The push rod (313) passes through the protective shell (315). A push block (312) is fixedly connected to one end of the push rod (313) away from the protective shell (315). The push block (312) is located above the connecting plate (304).