Arthroscopic surgery auxiliary device

Abstract

The invention discloses an arthroscopic surgery auxiliary device, and relates to the technical field of medical auxiliary instruments. The first threaded rods are rotationally inserted into the left side and the right side of the front portion of the operating bed through bearings, strip-shaped blocks are movably inserted into the inner walls of the front sides of the containing grooves, the first threaded rods are rotationally arranged on the strip-shaped blocks in a penetrating mode through threads, and the first connecting blocks are rotationally arranged at the rear ends of the two strip-shaped blocks through shafts and bearings; the first connecting blocks are movably inserted into the second supporting plates and are rotationally connected with the second supporting plates through shafts and bearings, the second connecting blocks are rotationally inserted into the two first supporting plates through the shafts and the bearings, rotating rods are fixedly arranged on the second connecting blocks, and the rotating rods are rotationally inserted into the rear sides of the placing grooves through bearings; the limb fixing device can be adjusted and fixed in different bending states of the limbs of a patient, the limbs of the patient can be adjusted to be inclined to a certain degree and fixed according to the operation requirements of a doctor, and meanwhile auxiliary supporting can be provided for the arms of the doctor in the operation process.

Description

Technical Field

[0001] This invention relates to the field of medical assistive device technology, specifically to an arthroscopic surgery assistive device. Background Technology

[0002] Arthroscopic surgery is a minimally invasive procedure that allows access to the patient's joint through a small incision. Joint lesions are discovered during the exploration process using surgical instruments, and then treated under arthroscopic guidance. During the surgery, auxiliary devices are often used to fix the patient's limb at a suitable bending angle. In actual operation, not only is the patient's limb bent, but sometimes it also needs to be tilted to facilitate the surgeon's operation. However, existing auxiliary devices cannot effectively fix the patient's limb in different tilt positions according to actual needs. Furthermore, the weight of the arthroscope is borne by the surgeon during the procedure, which can place a significant burden on the surgeon if the operation is prolonged, hindering the procedure. Therefore, there is an urgent need for an auxiliary device for arthroscopic surgery. Summary of the Invention

[0003] The purpose of this invention is to address the deficiencies and shortcomings of the prior art by providing a reasonably designed and easy-to-use arthroscopic surgical aid device to solve the aforementioned problems.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows: it includes an operating table, a first support plate, a second support plate, and a fixing strap. The first support plate is movably installed in two resting slots opened on the operating table. The second support plate is spun onto the first support plate through a shaft and a bearing. The first and second support plates are both equipped with fixing straps.

[0005] It also includes:

[0006] Two threaded rods are provided, which are respectively screwed into the left and right sides of the front of the operating table through bearings. A strip block is movably inserted into the inner wall of the front side of the support groove. The threaded rods are screwed into the strip block. A support arm mechanism is provided in the strip grooves opened on the left and right sides of the upper part of the operating table.

[0007] The first connecting block consists of two blocks, which are respectively screwed onto the rear ends of the two strip blocks via shafts and bearings. The first connecting block is movably inserted into the second support plate and screwed onto it via shafts and bearings.

[0008] The second connecting block consists of two blocks, which are respectively screwed onto the two first support plates via shafts and bearings. A rotating rod is fixedly installed on the second connecting block, and the rotating rod is screwed onto the rear side of the support groove via bearings. The operating table is equipped with a tilt control mechanism that cooperates with the rotating rod.

[0009] Through the above technical solution, the movement of the strip block can be achieved by rotating the No. 1 threaded rod, and the support of the No. 1 support plate and the No. 2 support plate can be used to adjust the degree of bending of the patient's leg. Under the action of the tilt control mechanism, the tilt position of the patient's leg can also be adjusted to a certain extent, making it easier for the doctor to operate. At the same time, the arm support mechanism can also provide auxiliary support for the doctor's arm to hold the arthroscope, relieving the doctor's arm fatigue.

[0010] Preferably, the support arm mechanism comprises:

[0011] The first support rod is movably installed in the strip groove. A rotating shaft is screwed onto the inner wall of the strip groove via a bearing. The rotating shaft is movably inserted into a cylindrical groove opened on the first support rod. One end of the rotating shaft is fixedly provided with a limit plate and located in the cylindrical groove.

[0012] Spring No. 1 is movably sleeved on the rotating shaft. The two ends of Spring No. 1 are fixed to the limiting plate and the inner wall of the cylindrical groove, respectively. Several limiting rods are fixedly arranged with rounded corners at the outer position of the rotating shaft on the No. 1 support rod. The limiting rods are movably inserted into the fixing groove opened on the inner wall of the strip groove.

[0013] The second support rod is screwed into the first support rod via a shaft and bearing. The first support rod is threaded with a third threaded rod, one end of which passes through the second support rod and is movably inserted into a slot on the inner side wall of the strip groove.

[0014] Through the above technical solution, the No. 1 support rod and the No. 2 support rod can provide auxiliary support for the doctor's arm. At the same time, the limiting rod can also provide support for various tilt angles of the No. 1 support rod, which is more conducive to adjusting the No. 1 support rod and the No. 2 support rod to the position that is suitable for the doctor.

[0015] Preferably, a rolling sleeve is spun onto the second support rod via a bearing, and a flexible cylinder is fixedly fitted onto the rolling sleeve. The rolling sleeve can rotate on the second support rod, which is beneficial for the doctor to move his arm back and forth to operate the arthoscope. The flexible cylinder can increase the comfort of the doctor's arm during the support process.

[0016] Preferably, a protective edge strip is fixedly installed on the upper part of the first support rod. The protective edge strip not only makes it easier to pull or rotate the first support rod, but also provides protection for the side of the operating table when the first support rod is in a horizontal state.

[0017] Preferably, the tilt control mechanism comprises:

[0018] The No. 2 threaded rod is screwed onto the side wall of the operating table via a bearing, and the two threads of the No. 2 threaded rod are set in opposite directions.

[0019] The locking blocks are two in number, located on the left and right sides of the rotating rod respectively, and the locking blocks are movably set in the control slot opened on the operating table. The second threaded rod is threadedly connected to the two locking blocks. Anti-slip pads are fixedly set on the arc-shaped inner sidewall of the locking blocks, and the anti-slip pads are set against the rotating rod.

[0020] The control handle is fixedly mounted on the outer end of the No. 2 threaded rod and is movably mounted on the side wall of the operating table.

[0021] Through the above technical solution, the rotation of the No. 2 threaded rod can realize the synchronous reverse movement of the locking blocks on both sides. During the process of locking and clamping the rotating rod, the friction between the rotating rods can be increased by the anti-slip pad, which allows the patient's leg to be adjusted and fixed in different tilt angles, making it more convenient to position the patient's leg in a suitable tilt position for the doctor to perform surgery.

[0022] Preferably, a limiting block is movably abutted in the limiting groove opened on the control handle. After one end of the limiting block protrudes from the limiting groove, it is movably inserted into a groove opened on the side wall of the operating table. A second spring is fixedly installed in the groove. One end of the second spring is fixedly connected to the limiting block. By applying the rebound thrust to the limiting block through the second spring, a certain degree of limiting control of the position state of the control handle can be achieved.

[0023] Preferably, a slider is fixedly provided on the upper part of the locking block, and the slider is slidably disposed in a groove opened on the top wall of the control groove, which is more conducive to the movement of the locking block in the control groove.

[0024] Preferably, a foot pedal is fixedly installed on the upper part of the second support plate to provide support for the patient's feet.

[0025] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0026] 1. Through the cooperation of the No. 1 support plate, No. 2 support plate, No. 1 threaded rod, strip block, No. 1 connecting block, No. 2 connecting block, rotating rod and support arm mechanism, it can not only adjust and fix the patient's limb in different bending states, but also adjust, tilt and fix the patient's limb to a certain extent according to the doctor's surgical needs, which is more conducive to the doctor's surgical operation.

[0027] 2. The arm support mechanism not only provides auxiliary support for the doctor's arm when operating the arthroscopy, reducing the workload on the doctor's arm, but also allows for adjustment of the support position as needed;

[0028] 3. By using the No. 2 spring and the limit block together, the position of the control lever can be limited to a certain extent, thereby preventing the No. 2 threaded rod from rotating arbitrarily and causing the locking block to loosen from the rotating rod. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the structure of the present invention.

[0030] Figure 2 This is a schematic diagram of a specific embodiment of the present invention.

[0031] Figure 3 This is an exploded view of the operating table, rolling sleeve, flexible cylinder, first support rod, rotating shaft, limiting rod, second support rod, and third spring in this invention.

[0032] Figure 4 This is a cross-sectional view of the operating table in this invention.

[0033] Figure 5 for Figure 4 Enlarged view of part A in the image.

[0034] Figure 6 for Figure 4 Enlarged view of part B in the image.

[0035] Figure 7 This is an exploded view of the parts of the first support plate, the second support plate, the first threaded rod, the strip block, the first connecting block, the second connecting block, and the rotating rod in this invention.

[0036] Figure 8 This is a cross-sectional view of the first support rod in this invention.

[0037] Explanation of reference numerals in the attached figures:

[0038] Operating table 1, No. 1 support plate 2, No. 2 support plate 3, fixing strap 4, No. 1 threaded rod 5, support groove 6, strip block 7, support arm mechanism 8, No. 1 support rod 8-1, rotating shaft 8-2, No. 1 spring 8-3, limiting rod 8-4, No. 2 support rod 8-5, No. 3 threaded rod 8-6, No. 1 connecting block 9, No. 2 connecting block 10, rotating rod 11, tilt control mechanism 12, No. 2 threaded rod 12-1, locking block 12-2, anti-slip pad 12-3, control handle 12-4, rolling sleeve 13, flexible cylinder 14, guard strip 15, limiting block 16, No. 2 spring 17, slider 18, foot pedal 19, control groove 20, limiting groove 21, cylindrical groove 22, fixing groove 23. Detailed Implementation

[0039] The invention will now be further described with reference to the accompanying drawings.

[0040] Example 1:

[0041] like Figures 1-8 As shown, this embodiment includes an operating table 1, a first support plate 2, a second support plate 3, and a fixing strap 4. The first support plate 2 is movably installed in two resting slots 6 on the operating table 1. The second support plate 3 is screwed onto the first support plate 2 via a shaft and bearing. The first support plate 2 and the second support plate 3 are both equipped with fixing straps 4. The upper part of the second support plate 3 is fixed with a foot pedal 19 by bolts, which can provide support for the patient's feet when the leg joint is bent.

[0042] It also includes:

[0043] Two threaded rods 5 are provided, which are respectively screwed into the left and right sides of the front part of the operating table 1 through bearings. A strip block 7 is movably inserted into the inner wall of the front side of the support groove 6. The threaded rod 5 is screwed into the strip block 7 through the thread. A support arm mechanism 8 is provided in the strip grooves opened on the left and right sides of the upper part of the operating table 1.

[0044] Connecting block 9, there are two connecting blocks 9, which are respectively screwed to the rear end of the two strip blocks 7 by shaft and bearing, and the connecting block 9 is movably inserted into the second support plate 3 and screwed to it by shaft and bearing.

[0045] Two connecting blocks 10 are provided, each screwed onto one support plate 2 via a shaft and bearing. A rotating rod 11 is fixed to the connecting block 10 by bolts. The rotating rod 11 is screwed onto the rear side of the support groove 6 via a bearing. The operating table 1 is provided with an tilt control mechanism 12 that cooperates with the rotating rod 11. When the threaded rod 5 is rotated, the strip block 7 can be moved. Under the action of the connecting block 9, the second support plate 3 moves towards the first support plate 2, changing the degree of bending of the first support plate 2 and the second support plate 3 in the support state of the patient's legs.

[0046] The support arm mechanism 8 includes:

[0047] The first support rod 8-1 is movably installed in the strip groove. A rotating shaft 8-2 is screwed onto the inner wall of the strip groove via a bearing. The rotating shaft 8-2 is movably inserted into the cylindrical groove 22 opened on the first support rod 8-1. One end of the rotating shaft 8-2 is fixed with a limit plate by bolts and is located in the cylindrical groove 22.

[0048] Spring 8-3 is movably sleeved on the rotating shaft 8-2. Both ends of spring 8-3 are fixed to the limiting plate and the inner wall of the cylindrical groove 22, respectively. Several limiting rods 8-4 are fixedly arranged at the outer position of the rotating shaft 8-2 on the first support rod 8-1 with rounded corners. The limiting rods 8-4 are movably inserted into the fixing groove 23 opened on the inner wall of the strip groove. The limiting rods 8-4 can support the first support rod 8-1 in different tilt states, which facilitates the adjustment of the doctor's arm support position.

[0049] The second support rod 8-5 is screwed into the first support rod 8-1 via a shaft and bearing. The first support rod 8-1 is threaded through a third threaded rod 8-6. One end of the third threaded rod 8-6 passes through the second support rod 8-5 and is movably inserted into a slot on the inner side wall of the strip groove. The third threaded rod 8-6 can limit and fix the position of the first support rod 8-1 and the second support rod 8-5 in the strip groove.

[0050] The tilt control mechanism 12 includes:

[0051] The No. 2 threaded rod 12-1 is screwed onto the side wall of the operating table 1 via a bearing, and the two threads of the No. 2 threaded rod 12-1 are set in opposite directions.

[0052] Two locking blocks 12-2 are located on the left and right sides of the rotating rod 11, respectively. Each locking block 12-2 is movably mounted within a control groove 20 on the operating table 1. A slider 18 is fixedly mounted on the upper part of each locking block 12-2, and the slider 18 slides within a groove on the top wall of the control groove 20, facilitating the movement of the locking blocks 12-2 within the control groove 20. A second threaded rod 12-1 is threadedly connected to both locking blocks 12-2. Anti-slip pads 12-3 are adhered and fixedly mounted on the arc-shaped inner sidewall of each locking block 12-2, providing abrasion protection. The contact is set on the rotating rod 11. When the first support plate 2 and the second support plate 3 are tilted to the left and right, the patient's leg can be tilted, so that the second connecting block 10 and the rotating rod 11 can rotate at a certain angle. The rotation of the second threaded rod 12-1 can realize the synchronous reverse movement of the locking blocks 12-2 on both sides, so that the locking blocks 12-2 lock and clamp the rotating rod 11. The anti-slip pad 12-3 increases the friction between the rotating rod 11, so as to fix the patient's leg in different tilt angle states. This is more conducive to adjusting the patient's leg to the appropriate tilt state for the doctor to perform surgery.

[0053] The control handle 12-4 is fixed to the outer end of the second threaded rod 12-1 by bolts and is movably mounted on the side wall of the operating table 1. A limiting block 16 is movably abutted in the limiting groove 21 opened on the control handle 12-4. One end of the limiting block 16 protrudes from the limiting groove 21 and is movably inserted into a groove opened on the side wall of the operating table 1. A second spring 17 is fixedly installed in the groove. One end of the second spring 17 is fixedly connected to the limiting block 16. The rebound thrust applied by the second spring 17 to the limiting block 16 can achieve a certain degree of limiting control of the position of the control handle 12-4, thereby preventing the second threaded rod 12-1 from rotating arbitrarily and causing the locking block 12-2 to loosen its clamping of the rotating rod 11.

[0054] Example 2:

[0055] See Figures 1-3 and Figure 8 As shown, an improvement is made based on Embodiment 1. A rolling sleeve 13 is spun onto the second support rod 8-5 via a bearing. A flexible cylinder 14 is fixedly fitted onto the rolling sleeve 13. The rolling sleeve 13 can rotate on the second support rod 8-5, which is beneficial for the doctor's arm to move back and forth to operate the arthroscopy. During the process of supporting the doctor's arm, the second support rod 8-5 can increase the comfort of supporting the doctor's arm due to the good flexibility of the flexible cylinder 14 itself. A guard strip 15 is fixedly installed on the upper part of the first support rod 8-1. The guard strip 15 not only makes it easier to pull or rotate the first support rod 8-1, but also provides protection for the side of the operating table 1 when the first support rod 8-1 is in a horizontal state.

[0056] When using this invention, the patient lies on the operating table 1, and the affected leg on one side is placed on the first support plate 2 and the second support plate 3 on the corresponding side. Then, it is fixed with the fixing strap 4. When it is necessary to adjust the bending range of the patient's leg, the first threaded rod 5 can be rotated, so that the strip block 7 drives the first connecting block 9 to move backward, changing the angle between the first support plate 2 and the second support plate 3, thereby adjusting the bending range of the patient's leg.

[0057] When adjusting the tilt angle of the patient's leg, rotate control handle 12-4. This causes the limiting block 16 to disengage from the limiting groove 21 and press against the second spring 17 inside the groove. When control handle 12-4 disengages from the limiting block 16, the second spring 17 returns to its original position, pushing the limiting block 16 so that one end of the limiting block 16 protrudes from the groove. Simultaneously, during rotation, control handle 12-4 drives the second threaded rod 12-1 to rotate, causing the two locking blocks 12-2 to move synchronously in opposite directions. The locking blocks 12-2 drive the anti-slip pad 12-3 to move away from the rotating rod 11. At this point, the first support plate 2 and the second support plate 3 can be swung left and right. With the patient's leg in a suitable tilt position, the control handle 12-4 can be rotated in the opposite direction. The control plate drives the second threaded rod 12-1 to rotate in the opposite direction, causing the two locking blocks 12-2 to move synchronously in opposite directions. The two locking blocks 12-2 clamp the rotating rod 11 and make the anti-slip pad 12-3 firmly contact and adhere to the rotating rod 11. The friction generated between the anti-slip pad 12-3 and the rotating rod 11 can prevent the rotating rod 11 from rotating, thus fixing the patient's leg in the tilt position after adjustment. At this time, one end of the limiting block 16 will also abut against the limiting groove 21, limiting the control handle 12-4 to a certain extent.

[0058] Before performing surgery on the patient, the No. 3 threaded rod 8-6 can be screwed down to remove it from the No. 1 support rod 8-1 and the No. 2 support rod 8-5. Then, the No. 1 support rod 8-1 is pulled outward through the guard strip 15. The No. 1 support rod 8-1 drives the limiting rod 8-4 to move outward out of the fixing groove 23. At the same time, the No. 1 spring 8-3 will be compressed. Then, the No. 1 support rod 8-1 is rotated, which drives the rotating shaft 8-2 to rotate. After the No. 1 support rod 8-1 rotates to the appropriate state, the outward force on the guard strip 15 can be released. At this time, the No. 1 spring 8-3 returns to its original position and extends, allowing the… The first support rod 8-1 moves towards the groove, and the limiting rod 8-4 is inserted into the corresponding fixed groove 23 to support the first support rod 8-1. Then, the second support rod 8-5 is flipped out of the first support rod 8-1, and the third threaded rod 8-6 is screwed back onto the first support rod 8-1. At this time, the third threaded rod 8-6 will also abut against the second support rod 8-5, thus supporting and limiting the second support rod 8-5 after it has been flipped. During the subsequent operation, the surgeon's arm can be placed on the flexible cylinder 14 to provide auxiliary support for the surgeon's arm and avoid excessive fatigue in the surgeon's arm due to prolonged use of the arthroscope.

[0059] Compared with the prior art, the beneficial effects of this specific embodiment are as follows:

[0060] 1. Through the cooperation of support plate 1, support plate 2, threaded rod 5, strip block 7, connecting block 1, connecting block 2, and rotating rod 11, it can not only be adjusted and fixed in different bending states of the patient's limbs, but also adjust, tilt and fix the patient's limbs to a certain extent according to the doctor's surgical needs, which is more conducive to the doctor's surgical operation.

[0061] 2. The arm support mechanism 8 not only provides auxiliary support for the doctor's arm when operating the arthroscopy, reducing the doctor's arm's operational burden, but also allows for adjustment of the support position as needed;

[0062] 3. By cooperating with the second spring 17 and the limiting block 16, the position of the control lever 12-4 can be limited to a certain extent, thereby preventing the locking block 12-2 from loosening from the rotating rod 11 due to the random rotation of the second threaded rod 12-1.

[0063] The above description is only used to illustrate the technical solution of the present invention and is not intended to limit it. Any other modifications or equivalent substitutions made by those skilled in the art to the technical solution of the present invention, as long as they do not depart from the spirit and scope of the technical solution of the present invention, should be covered within the scope of the claims of the present invention.

Claims

1. An arthroscopic surgery auxiliary device, comprising an operating table (1), a first support plate (2), a second support plate (3), and a fixing strap (4), wherein the first support plate (2) is movably disposed in two resting slots (6) opened on the operating table (1), and the second support plate (3) is spun onto the first support plate (2) via a shaft and bearing, and the first support plate (2) and the second support plate (3) are both provided with fixing straps (4); Its features are, It also includes: Two threaded rods (5) are respectively screwed into the left and right sides of the front of the operating table (1) by bearings. A strip block (7) is movably inserted into the inner wall of the front side of the support groove (6). The threaded rod (5) is screwed into the strip block (7) by threads. A support arm mechanism (8) is provided in the strip grooves opened on the left and right sides of the upper part of the operating table (1). There are two No. 1 connecting blocks (9), which are respectively screwed onto the rear ends of the two strip blocks (7) by shafts and bearings, and the No. 1 connecting block (9) is movably inserted into the No. 2 support plate (3) and screwed onto it by shafts and bearings. The second connecting block (10) consists of two parts, which are respectively screwed onto the two first support plates (2) via shafts and bearings. A rotating rod (11) is fixedly installed on the second connecting block (10). The rotating rod (11) is screwed onto the rear side of the support groove (6) via bearings. The operating table (1) is provided with an tilt control mechanism (12) that cooperates with the rotating rod (11).

2. The arthroscopic surgery auxiliary device according to claim 1, characterized in that: The support arm mechanism (8) includes: The first support rod (8-1) is movably installed in the strip groove. A rotating shaft (8-2) is screwed onto the inner wall of the strip groove via a bearing. The rotating shaft (8-2) is movably inserted into the cylindrical groove (22) opened on the first support rod (8-1). One end of the rotating shaft (8-2) is fixedly provided with a limit plate and located in the cylindrical groove (22). Spring No. 1 (8-3) is movably sleeved on the rotating shaft (8-2). The two ends of Spring No. 1 (8-3) are fixed to the limiting plate and the inner wall of the cylindrical groove (22) respectively. Several limiting rods (8-4) are fixedly arranged at the outer position of the rotating shaft (8-2) on the No. 1 support rod (8-1) with rounded corners. The limiting rods (8-4) are movably inserted into the fixing groove (23) opened on the inner wall of the strip groove. The second support rod (8-5) is screwed into the first support rod (8-1) via a shaft and bearing. The first support rod (8-1) is threaded through a third threaded rod (8-6). One end of the third threaded rod (8-6) passes through the second support rod (8-5) and is movably inserted into a slot on the inner side wall of the strip groove.

3. The arthroscopic surgery auxiliary device according to claim 2, characterized in that: A rolling sleeve (13) is screwed onto the second support rod (8-5) via a bearing, and a flexible sleeve (14) is fixedly fitted onto the rolling sleeve (13).

4. The arthroscopic surgery auxiliary device according to claim 2, characterized in that: A protective edge strip (15) is fixedly installed on the upper part of the first support rod (8-1).

5. The arthroscopic surgery aid device according to claim 1, characterized in that: The tilt control mechanism (12) includes: The No. 2 threaded rod (12-1) is screwed onto the side wall of the operating table (1) via a bearing. The two threads of the No. 2 threaded rod (12-1) are set in opposite directions. Locking blocks (12-2), there are two locking blocks (12-2), which are located on the left and right sides of the rotating rod (11) respectively, and the locking blocks (12-2) are movably set in the control groove (20) opened on the operating table (1). The second threaded rod (12-1) is threadedly connected to the two locking blocks (12-2). The anti-slip pad (12-3) is fixedly set on the arc-shaped inner sidewall of the locking block (12-2), and the anti-slip pad (12-3) is abutted against the rotating rod (11); The control handle (12-4) is fixedly installed at the outer end of the second threaded rod (12-1) and is movably installed on the side wall of the operating table (1).

6. The arthroscopic surgery auxiliary device according to claim 5, characterized in that: A limiting block (16) is movably abutted in the limiting groove (21) opened on the control handle (12-4). After one end of the limiting block (16) protrudes from the limiting groove (21), it is movably inserted into the groove opened on the side wall of the operating table (1). A second spring (17) is fixedly installed in the groove, and one end of the second spring (17) is fixedly connected to the limiting block (16).

7. The arthroscopic surgery aid device according to claim 5, characterized in that: The upper part of the locking block (12-2) is fixedly provided with a slider (18), which is slidably disposed in a groove opened on the top wall of the control groove (20).

8. The arthroscopic surgery auxiliary device according to claim 1, characterized in that: A foot pedal (19) is fixedly installed on the upper part of the second support plate (3).

Images