Auxiliary operation acting device for hepatobiliary surgery department

Abstract

The invention discloses a hepatobiliary surgery department auxiliary operation acting device, and relates to the field of hepatobiliary surgery departments, the hepatobiliary surgery department auxiliary operation acting device is characterized in that a sliding supporting plate is installed in a first support, a fixed moving plate is installed on the upper surface of the sliding supporting plate, and a moving sliding groove is formed in the inner surface of the first support; and a meshing transmission mechanism for moving the sliding supporting plate up and down is mounted in the movable sliding groove. According to the auxiliary operation acting device for the hepatobiliary surgery department, when the height needs to be adjusted when operations are carried out on patients with different figures, a pulling meshing rod is pulled downwards, and the pulling meshing rod slides downwards to drive a meshing transmission gear to generate meshing motion to carry out circumferential rotation; the meshing transmission gear rotates to drive the fixed gear rod to slide upwards along the interior of the movable sliding groove, and due to the fact that the fixed movable plate and the fixed gear rod are integrally designed, the meshing transmission gear enables the fixed movable plate to slide upwards through the fixed gear rod and the sliding supporting plate so that the height can be adjusted.

Description

Technical Field

[0001] The present invention relates to the technical field of hepatobiliary surgery, and in particular to a hepatobiliary surgery auxiliary operation device. Background Art

[0002] When performing surgery on hepatobiliary patients, in order to provide doctors with sufficient operating field of view, it is often necessary to retract the patient's surgical incision to ensure that it will not affect the doctor's surgical operation. Medical staff often need to use surgical retractors to perform traction.

[0003] In the current traction operations, most of them still use manual operation of medical staff to traction the wound. During the long operation, the medical staff will inevitably feel sore hands and feet, and the wound fixation is unstable. It also increases the difficulty of the operation for the surgeon, is not convenient for long-term operations, and the angle is not easy to adjust, which cannot enable the medical staff to perform the operation well.

[0004] In order to overcome the above-mentioned defects, the prior art (application number: CN116421240A, Chinese patent with application date of 2023-06-14) discloses an auxiliary surgical device for hepatobiliary surgery, which is characterized in that it includes an adjustment platform, a traction drive mechanism, a traction reversing mechanism, a traction frame and a controller; the adjustment platform includes a mounting plate, and a lifting frame is provided at the lower end of the mounting plate; the number of the traction frames is two and they are symmetrically distributed on the left and right sides, and the two traction frames are respectively connected to the left and right ends of the traction reversing mechanism, and the two traction frames are provided with an equal number of traction mechanisms. The advantage is that the traction frame and the traction mechanism are used in combination, which can not only realize the secondary adjustment of the traction position, and the traction position is more accurate, but also realize the secondary adjustment of the traction force of a single traction mechanism under the premise of ensuring traction, so as to avoid tearing of the two ends of the patient's surgical wound due to the traction force, and avoid secondary injury to the patient when the device pulls the patient's surgical wound, and the design is more humane, which is convenient for the promotion and use of the product.

[0005] Although the existing technology can solve the above problems, it cannot maintain stability well during long surgical procedures, and is not convenient enough to adjust the lying height of different patients. The strength is not well controlled during the traction adjustment process, which may cause tearing of the patient's wound due to poor control of the strength, causing unnecessary injuries. In addition, the adjustment efficiency of the existing equipment is not efficient enough for patients with more serious conditions, which may delay the patient's condition and may aggravate the condition. Summary of the invention

[0006] The purpose of the present invention is to provide an auxiliary operation device for hepatobiliary surgery to solve the problems proposed in the above-mentioned background technology that the stability cannot be maintained well during a long operation, and the lying height adjustment for different patients is not convenient enough. The strength is not well controlled during the traction adjustment process, which may cause the patient's wound to be torn due to poor control of the strength, causing unnecessary damage. In addition, the adjustment efficiency of the existing equipment is not efficient enough for patients with more serious conditions, which may delay the patient's condition and may aggravate the condition.

[0007] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a hepatobiliary surgery auxiliary operation device, comprising a sliding support plate installed inside the first bracket, and a fixed movable plate installed on the upper surface of the sliding support plate, a movable slide groove is provided on the inner surface of the first bracket, and a meshing transmission mechanism for moving the sliding support plate up and down is installed inside the movable slide groove, the meshing transmission mechanism comprises a fixed gear rod, and a meshing transmission gear is installed on the left side of the fixed gear rod, and the meshing transmission gear is rotatably installed on the inner surface of the first bracket, a pulling meshing rod is installed on the left side of the meshing transmission gear, and a traction connecting rod is installed above the pulling meshing rod, the pulling meshing rod is slidably installed on the inner surface of the first bracket, and a second bracket is installed on the outer surface of the sliding support plate; A traction connecting rod is installed above the pulling engagement rod, and an elastic sliding mechanism for transmitting the auxiliary stretching hook is installed above the traction connecting rod.

[0008] Furthermore, the elastic sliding mechanism includes a passive gear rod, and the passive gear rod is fixedly mounted on the upper surface of the traction connecting rod, a transmission gear plate is mounted on the outer surface of the passive gear rod, and the outer surface of the transmission gear plate is in contact with the passive gear rod, a rotating fixed frame is mounted on the outer surface of the transmission gear plate, and the transmission gear plate is rotatably mounted inside the rotating fixed frame.

[0009] Furthermore, the transmission gear plate is fixedly mounted on the upper surface of the fixed movable plate, and a driving gear rod is mounted above the transmission gear plate. The transmission gear plate contacts the driving gear rod to generate meshing motion, and a sliding driving rod is mounted on the outer surface of the driving gear rod.

[0010] Furthermore, the first bracket and the second bracket are installed in two groups symmetrically about the center point of the fixed movable plate, and an operating hollow frame is installed inside the fixed movable plate. A limiting sliding groove is installed above the first bracket and the second bracket, and the left and right ends of the fixed movable plate are installed inside the limiting sliding groove.

[0011] Furthermore, the inner surface of the first bracket contacts the outer surface of the sliding support plate to form a sliding structure, and the outer surface of the sliding support plate contacts the inner surface of the second bracket to form a sliding structure, and the first bracket and the second bracket are installed symmetrically about the center point of the fixed movable plate.

[0012] Furthermore, the outer surface of the fixed gear rod contacts the inner surface of the movable slide groove to form a sliding structure, and the outer surface of the fixed gear rod contacts the outer surface of the meshing transmission gear to form a meshing structure, and the outer surface of the pulling meshing rod contacts the outer surface of the meshing transmission gear to form a meshing structure.

[0013] Furthermore, the limiting sliding groove and the second bracket are designed as an integral unit, and the first bracket and the limiting sliding groove are designed as an integral unit, and the outer surfaces on both sides of the fixed movable plate are in contact with the inner surface of the limiting sliding groove to form a sliding structure.

[0014] Furthermore, a sliding traction rod is installed at the end of the sliding driving rod, and a moving groove is installed on the outer surface of the sliding traction rod, and a sliding inner groove is opened above the moving groove, and a resistance spring is installed on the outer surface of the sliding traction rod, and an auxiliary stretching hook is installed at the end of the sliding traction rod.

[0015] Furthermore, the movable groove is fixedly installed above the fixed movable plate, and the outer surface of the transmission gear plate contacts the outer surface of the driving gear rod to form a meshing movement, and the driving gear rod is fixedly connected with the end of the sliding traction rod through the end of the sliding driving rod to form a transmission structure.

[0016] Furthermore, three groups of sliding traction rods are installed equidistantly about the center point of the movable groove, and the inner surface of the sliding inner groove contacts the end of the resistance spring to form an elastic structure, and the sliding driving rod is fixedly connected to the auxiliary stretching hook through the end of the sliding traction rod to form a transmission structure.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: when the height of the hepatobiliary surgery auxiliary operation device needs to be adjusted during surgery on patients of different body sizes, the meshing rod is pulled downward, and the downward sliding of the meshing rod drives the meshing transmission gear to generate a meshing motion and perform a circular rotation, and the rotation of the meshing transmission gear drives the fixed gear rod to slide upward along the inside of the moving slide groove, and since the fixed moving plate and the fixed gear rod are designed as an integrated whole, the meshing transmission gear slides the fixed moving plate upward through the sliding support plate via the fixed gear rod to adjust the height, and such a design makes the doctor's operation more convenient; Furthermore, the downward sliding of the engagement rod drives the traction connecting rods fixed together to slide synchronously, the stable moving frame starts to slide along the second bracket, and the passive gear rod causes the transmission gear plate to rotate in a circle, and the transmission gear plate rotates in a circle along the rotating fixed frame to drive the gear rod to slide to adjust the patient's wound. This design makes the pulling operation of the patient's wound position faster. Further movement of the sliding drive rod causes the sliding traction rod to slide along the sliding inner groove and squeeze the resistance spring during the sliding process. The sliding contraction of the sliding traction rod causes the auxiliary stretching hook at the end to move, and after reaching a reasonable height, even if the movement does not stop, the resistance spring can also provide a buffering effect, ensuring that the patient's wound will not suffer greater damage. Compared with manual fixation by manpower, it is more convenient and the fixation operation will not be unstable due to fatigue. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the three-dimensional structure of the first bracket of the present invention; Figure 2 It is a schematic diagram of the three-dimensional structure of the sliding support plate of the present invention; Figure 3 It is a schematic diagram of the three-dimensional structure of the limiting sliding groove of the present invention; Figure 4 This is a schematic diagram of the three-dimensional structure of the fixed movable plate of the present invention; Figure 5 It is a schematic diagram of the three-dimensional structure of the pulling engagement rod of the present invention; Figure 6 This is a schematic diagram of the three-dimensional structure of the passive gear rod of the present invention; Figure 7 It is a schematic diagram of the three-dimensional structure of the traction connecting rod of the present invention; Figure 8 This is a schematic diagram of the three-dimensional structure of the hollow frame in the operation of the present invention; Fig. 9 It is a schematic diagram of the three-dimensional structure of the sliding driving rod of the present invention.

[0019] In the figure: 1. first bracket; 2. sliding support plate; 3. fixed movable plate; 4. limited sliding groove; 5. second bracket; 6. pulling engagement rod; 7. traction connecting rod; 8. passive gear rod; 9. transmission gear plate; 10. rotating fixed frame; 11. driving gear rod; 12. movable groove; 13. sliding inner groove; 14. sliding traction rod; 15. auxiliary stretching hook; 16. fixed gear rod; 17. meshing transmission gear; 18. operating hollow frame; 19. stable movable frame; 20. resistance spring; 21. sliding driving rod; 22. movable slide groove. DETAILED DESCRIPTION

[0020] 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.

[0021] Example 1: Please refer to Figure 1-6 The present invention provides the following technical solution: a hepatobiliary surgery auxiliary operation device, including a first bracket 1, a sliding support plate 2 and a sliding driving rod 21.

[0022] A sliding support plate 2 is installed inside the first bracket 1, and a fixed moving plate 3 is installed on the upper surface of the sliding support plate 2. A moving slide groove 22 is opened on the inner surface of the first bracket 1, and a meshing transmission mechanism for moving the sliding support plate 2 up and down is installed inside the moving slide groove 22. The meshing transmission mechanism includes a fixed gear rod 16, and a meshing transmission gear 17 is installed on the left side of the fixed gear rod 16, and the meshing transmission gear 17 is rotatably installed on the inner surface of the first bracket 1, a pulling meshing rod 6 is installed on the left side of the meshing transmission gear 17, and a traction connecting rod 7 is installed above the pulling meshing rod 6, and the pulling meshing rod 6 is slidably installed on the inner surface of the first bracket 1, and a second bracket 5 is installed on the outer surface of the sliding support plate 2; A traction connecting rod 7 is installed above the pulling engagement rod 6 , and an elastic sliding mechanism for transmitting the auxiliary stretching hook 15 is installed above the traction connecting rod 7 .

[0023] like Figure 2 , Figure 3 , Figure 4 , Figure 8The technical solution shown, in order to solve the problem that it is inconvenient to perform manual maintenance in the event of a malfunction, discloses: the first bracket 1 and the second bracket 5 are symmetrically installed in two groups about the center point of the fixed movable plate 3, and an operating hollow frame 18 is installed inside the fixed movable plate 3, a limited sliding groove 4 is installed above the first bracket 1 and the second bracket 5, and the left and right ends of the fixed movable plate 3 are installed inside the limited sliding groove 4, the inner surface of the first bracket 1 contacts the outer surface of the sliding support plate 2 to form a sliding structure, and the outer surface of the sliding support plate 2 contacts the inner surface of the second bracket 5 to form a sliding structure, and the first The bracket 1 and the second bracket 5 are installed symmetrically about the center point of the fixed movable plate 3. The outer surface of the fixed gear rod 16 contacts the inner surface of the movable slide groove 22 to form a sliding structure, and the outer surface of the fixed gear rod 16 contacts the outer surface of the meshing transmission gear 17 to form a meshing structure, and the outer surface of the pulling meshing rod 6 contacts the outer surface of the meshing transmission gear 17 to form a meshing structure, the limiting sliding groove 4 and the second bracket 5 are integrally designed, and the first bracket 1 and the limiting sliding groove 4 are integrally designed, and the outer surfaces on both sides of the fixed movable plate 3 contact the inner surface of the limiting sliding groove 4 to form a sliding structure.

[0024] When the height of the equipment needs to be adjusted for patients of different body shapes, the meshing rod 6 is first pulled downward along the inner surface of the first bracket 1. The sliding process of pulling the meshing rod 6 drives the meshing transmission gears 17 in contact with each other on the left side to produce a meshing movement. Since the meshing transmission gear 17 is rotatably installed on the back of the first bracket 1, the meshing transmission gear 17 produces a circular rotation. The rotation of the meshing transmission gear 17 drives the fixed gear rod 16 in contact on the right side to produce a meshing movement. The fixed gear rod 16 slides upward along the inside of the moving slide groove 22 opened on the back of the first bracket 1 due to the meshing movement, and the sliding support plate 2 is in contact with the fixed gear rod 16. The gear rod 16 is an integrated design, so the sliding support plate 2 slides and rises along the inside of the first bracket 1 due to the drive of the fixed gear rod 16, and because the sliding support plate 2 is installed in two groups symmetrically about the center point of the fixed movable plate 3, the sliding support plate 2 installed on the right end of the lower surface of the fixed movable plate 3 slides synchronously along the inside of the second bracket 5, and the left and right ends of the fixed movable plate 3 are constrained by the limiting sliding groove 4, ensuring that the sliding trajectory of the fixed movable plate 3 is smooth, and the limiting sliding groove 4 is fixedly connected to the top of the first bracket 1 and the second bracket 5 respectively, ensuring that the left and right ends of the fixed movable plate 3 move synchronously.

[0025] like Figure 1 , Figure 5 , Figure 6 , Figure 7 , Fig. 9The technical solution shown, in order to solve the problem that it is inconvenient to perform manual maintenance in the event of a failure, discloses: the elastic sliding mechanism includes a passive gear rod 8, and the passive gear rod 8 is fixedly mounted on the upper surface of the traction connecting rod 7, a transmission gear plate 9 is mounted on the outer surface of the passive gear rod 8, and the outer surface of the transmission gear plate 9 is in contact with the passive gear rod 8, a rotating fixed frame 10 is mounted on the outer surface of the transmission gear plate 9, and the transmission gear plate 9 is rotatably mounted inside the rotating fixed frame 10, the transmission gear plate 9 is fixedly mounted on the upper surface of the fixed movable plate 3, and a driving gear rod 11 is mounted above the transmission gear plate 9, the transmission gear plate 9 contacts with the driving gear rod 11 to produce meshing motion, and a sliding driving rod 21 is mounted on the outer surface of the driving gear rod 11, the limiting sliding groove 4 and the second bracket 5 are of an integrated design, and the first bracket 1 and the limiting sliding groove 4 are of an integrated design, and the outer surfaces of both sides of the fixed movable plate 3 and the inner surfaces of the limiting sliding groove 4 are The surface contact constitutes a sliding structure, a sliding traction rod 14 is installed at the end of the sliding driving rod 21, and a moving groove 12 is installed on the outer surface of the sliding traction rod 14, and a sliding inner groove 13 is opened above the moving groove 12, and a resistance spring 20 is installed on the outer surface of the sliding traction rod 14, and an auxiliary stretching hook 15 is installed at the end of the sliding traction rod 14, three groups of sliding traction rods 14 are equidistantly installed about the center point of the moving groove 12, and the inner surface of the sliding inner groove 13 contacts the end of the resistance spring 20 to form an elastic structure, and the sliding driving rod 21 is fixedly connected with the auxiliary stretching hook 15 through the end of the sliding traction rod 14 to form a transmission structure, the moving groove 12 is fixedly installed above the fixed moving plate 3, and the outer surface of the driving gear plate 9 contacts the outer surface of the driving gear rod 11 to form a meshing motion, and the driving gear rod 11 is fixedly connected with the end of the sliding traction rod 14 through the end of the sliding driving rod 21 to form a transmission structure.

[0026] When the meshing rod 6 is pulled downward, the traction connecting rod 7 fixedly connected to the meshing rod 6 above is pulled to produce synchronous sliding. The stable moving frame 19 fixed at the end of the traction connecting rod 7 ensures the transmission sliding effect of the traction connecting rod 7. The traction of the traction connecting rod 7 causes the passive gear rod 8 fixedly installed above to move synchronously, and slides horizontally due to the constraint of the stable moving frame 19. The horizontal sliding of the passive gear rod 8 drives the transmission gear plate 9 to rotate in a circle along the inside of the rotating fixed frame 10. The contact between the passive gear rod 8 and the transmission gear plate 9 constitutes a meshing motion, and the transmission gear plate 9 drives the sliding driving rod 21 to generate transmission through the meshing motion. The movement of the sliding driving rod 21 drives the sliding traction rod 14 fixed at the front end to move synchronously. The traction rod 14 slides along the sliding inner groove 13 opened above the moving groove 12, and during the sliding process of the sliding traction rod 14, the resistance spring 20 nested on the outer surface is squeezed and compressed during the sliding process inside the sliding inner groove 13. The auxiliary stretching hook 15 fixed at the lower end of the sliding traction rod 14 drives the patient's wound to be extended, and after moving to a suitable position, the fixed stability is ensured under the buffering effect of the resistance spring 20. The sliding traction rod 14 and the auxiliary stretching hook 15 are of an integrated design, and the sliding traction rod 14, the auxiliary stretching hook 15 and the resistance spring 20 are evenly installed in three groups at an equal distance from the center point of the moving groove 12, and the action position of the auxiliary stretching hook 15 is in the hollow position of the operating hollow frame 18, and the patient's wound position also corresponds to the operating hollow frame 18.

[0027] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A hepatobiliary surgery auxiliary operation device, comprising a first support (1), a sliding support plate (2) and a movable slide groove (22); Features: A sliding support plate (2) is installed inside the first bracket (1), and a fixed movable plate (3) is installed on the upper surface of the sliding support plate (2); a movable slide groove (22) is provided on the inner surface of the first bracket (1), and a meshing transmission mechanism for moving the sliding support plate (2) up and down is installed inside the movable slide groove (22); the meshing transmission mechanism comprises a fixed gear rod (16), and a meshing transmission gear (17) is installed on the left side of the fixed gear rod (16), and the meshing transmission gear (17) is rotatably installed on the inner surface of the first bracket (1); a pulling meshing rod (6) is installed on the left side of the meshing transmission gear (17), and a traction connecting rod (7) is installed above the pulling meshing rod (6); the pulling meshing rod (6) is slidably installed on the inner surface of the first bracket (1), and a second bracket (5) is installed on the outer surface of the sliding support plate (2); A traction connecting rod (7) is installed above the pulling engagement rod (6), and an elastic sliding mechanism for transmitting the auxiliary stretching hook (15) is installed above the traction connecting rod (7).

2. The hepatobiliary surgery auxiliary operation device according to claim 1, characterized in that: The elastic sliding mechanism comprises a passive gear rod (8), and the passive gear rod (8) is fixedly mounted on the upper surface of the traction connecting rod (7); a transmission gear plate (9) is mounted on the outer surface of the passive gear rod (8), and the outer surface of the transmission gear plate (9) contacts the passive gear rod (8); a rotating fixed frame (10) is mounted on the outer surface of the transmission gear plate (9), and the transmission gear plate (9) is rotatably mounted inside the rotating fixed frame (10).

3. The hepatobiliary surgery auxiliary operation device according to claim 2, characterized in that: The transmission gear plate (9) is fixedly mounted on the upper surface of the fixed movable plate (3), and a driving gear rod (11) is mounted above the transmission gear plate (9). The transmission gear plate (9) and the driving gear rod (11) are in contact to generate meshing motion, and a sliding driving rod (21) is mounted on the outer surface of the driving gear rod (11).

4. The hepatobiliary surgery auxiliary operation device according to claim 1, characterized in that: Two groups of the first bracket (1) and the second bracket (5) are symmetrically installed about the center point of the fixed movable plate (3), and an operating hollow frame (18) is installed inside the fixed movable plate (3). A limiting sliding groove (4) is installed above the first bracket (1) and the second bracket (5), and the left and right ends of the fixed movable plate (3) are installed inside the limiting sliding groove (4).

5. The hepatobiliary surgery auxiliary operation device according to claim 1, characterized in that: The inner surface of the first bracket (1) contacts the outer surface of the sliding support plate (2) to form a sliding structure, and the outer surface of the sliding support plate (2) contacts the inner surface of the second bracket (5) to form a sliding structure, and the first bracket (1) and the second bracket (5) are installed symmetrically about the center point of the fixed movable plate (3).

6. The hepatobiliary surgery auxiliary operation device according to claim 1, characterized in that: The outer surface of the fixed gear rod (16) contacts the inner surface of the movable slide groove (22) to form a sliding structure, and the outer surface of the fixed gear rod (16) contacts the outer surface of the meshing transmission gear (17) to form a meshing structure, and the outer surface of the pulling meshing rod (6) contacts the outer surface of the meshing transmission gear (17) to form a meshing structure.

7. The hepatobiliary surgery auxiliary operation device according to claim 3, characterized in that: The limiting sliding groove (4) and the second bracket (5) are of an integrated design, and the first bracket (1) and the limiting sliding groove (4) are of an integrated design, and the outer surfaces on both sides of the fixed movable plate (3) are in contact with the inner surface of the limiting sliding groove (4) to form a sliding structure.

8. The hepatobiliary surgery auxiliary operation device according to claim 3, characterized in that: A sliding traction rod (14) is installed at the end of the sliding driving rod (21), a moving groove (12) is installed on the outer surface of the sliding traction rod (14), a sliding inner groove (13) is opened above the moving groove (12), a resisting spring (20) is installed on the outer surface of the sliding traction rod (14), and an auxiliary stretching hook (15) is installed at the end of the sliding traction rod (14).

9. The hepatobiliary surgery auxiliary operation device according to claim 8, characterized in that: The movable groove (12) is fixedly mounted above the fixed movable plate (3), and the outer surface of the transmission gear plate (9) contacts the outer surface of the driving gear rod (11) to form a meshing motion, and the driving gear rod (11) is fixedly connected to the end of the sliding traction rod (14) through the end of the sliding driving rod (21) to form a transmission structure.

10. The hepatobiliary surgery auxiliary operation device according to claim 3, characterized in that: The sliding traction rod (14) is installed in three groups at equal distances from the center point of the moving groove (12), and the inner surface of the sliding inner groove (13) contacts the end of the resistance spring (20) to form an elastic structure, and the sliding driving rod (21) is fixedly connected to the auxiliary stretching hook (15) through the end of the sliding traction rod (14) to form a transmission structure.

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