A knee joint bidirectional traction device

Abstract

The present invention belongs to the technical field of medical devices, and relates to a two-way traction device for a knee joint, including a plurality of traction rods, a plurality of connecting rods, and a plurality of lifting connectors; the traction rods are composed of a Kirschner wire cannula, a Kirschner wire, and a fastening bolt; the traction rods are vertically and detachably connected to the connecting rods, and the adjacent connecting rods can be movably connected through a lifting connector, and the lifting connector is composed of a pressure sensor with a display, a sleeve section, a pressure groove, and a pressure nut; the present invention can adjust the height of the lifting connector through the pressure nut to achieve the effect of adjusting the pressure, and the traction rod can be inserted into the bone. Its advantages are: simple operation, stable structure, safety and reliability, controllable traction force, continuous and stable traction effect, bidirectional traction, and no need to actively resist the traction force.

Description

Technical Field

[0001] The invention relates to the technical field of medical devices, in particular to a knee joint bidirectional traction device. Background Art

[0002] At present, the existing tibial tubercle traction system in clinical practice is an important auxiliary means for treating fractures around the knee joint. After the fracture occurs, the fracture ends are pulled by the muscles or tendons attached to them, causing displacement such as angulation, shortening, rotation, and separation, which can easily cause compression of blood vessels and nerves, or even damage. For patients with severe soft tissue injuries or more underlying diseases, emergency surgery is not suitable for reduction and fixation. At this time, tibial tubercle traction is particularly important. By inserting a 4.0mm diameter Steinmann wire horizontally at the tibial tubercle level for traction, the contracted muscles and tendons can be re-stretched, so that the displaced fracture fragments can be reset or partially reset, thereby reducing the compression of blood vessels or nerves, facilitating arterial blood supply and venous return of tissues around the fracture, reducing soft tissue swelling, and gaining precious time and providing favorable conditions for elective surgery. In addition, the existing tibial tubercle traction uses the gravity of the heavy object at the distal end of the traction system to traction the lower limbs, which is a one-way traction. The patient will feel uncomfortable and needs to consciously maintain a counterforce opposite to the traction direction, otherwise the upper body will involuntarily move in the traction direction, affecting the traction effect. In addition, due to the lack of reverse traction above the femur, the traction effect is general, especially the idea of ​​reducing the fracture through the pulling and squeezing of the tendon is often difficult to achieve.

[0003] Chinese patent document: CN2669797Y discloses a bidirectional traction frame, which is composed of side plates, traction pins, counter-traction pins and elastic tendons. There are symmetrical traction holes and counter-traction holes on both ends of each side plate, and a sliding groove in the middle of the side plate, so that the traction pin can slide smoothly in the sliding groove. The connection relationship is: the two side plates are symmetrically placed together in parallel, a traction pin is inserted in the sliding groove of the side plate, the elastic tendons pass through the traction holes and are sleeved on both ends of the traction pin, and the counter-traction pin is inserted in the counter-traction hole of the side plate. The problem that counter-traction cannot be used in the treatment of upper limb fractures is solved, so that patients with fractures of phalanges, ulna, radius, humerus, etc. can still flex and extend their joints while traction is performed, and the medical device promotes fracture healing; it has the advantages of simple structure, low manufacturing cost, easy use, good treatment effect, reduced patient pain, short treatment time, low cost, etc. However, the device exposes the traction pin to the outside, and there is no relevant protection, which is easy to cause safety accidents, and the use of elastic belts for traction leads to unstable force application, which affects the treatment effect.

[0004] Chinese patent document: CN204655080U, discloses a phalangeal traction and reduction frame, including two long rod hooks, two short rod hooks, four needle bar clamps and two toothed rubber rings, which are used in combination with two Kirschner wires inserted into the phalanges in parallel. When in use, the long rod hook and the proximal Kirschner wire are connected and fixed by the needle rod clamp on both sides of the finger, the short rod hook and the distal Kirschner wire are connected and fixed by the needle rod clamp, and the long rod hook and the short rod hook are connected by a toothed rubber ring, and the traction reduction and fracture position are maintained by the tension of the rubber ring. This patent is mainly used for reducing and fixing fractures within interphalangeal joints, and the needle bar clamp is used for corresponding connection and fixation, and its stability is difficult to be effectively guaranteed. It also does not involve how to avoid the safety problem caused by the exposure of the two ends of the Kirschner wire. The elastic component toothed rubber ring is also used as a force-applying component, resulting in unstable force application, affecting the treatment effect.

[0005] Chinese patent document: CN206548586U discloses a fracture traction and pressure device, including an adjustable fixing frame, a crank handle, a traction and pressure rod, a connector, a bolt and a screw handle, wherein the adjustable fixing frame is fan-shaped, and a fan-shaped groove is provided inside the fixing frame, and a fixing sleeve is provided in the fan-shaped groove, and a screw hole is provided on the outer wall of the adjustable fixing frame, and the traction and pressure rod is a straight screw, and the traction and pressure rod cooperates with the screw hole, and one end of the traction and pressure rod is connected to the crank handle, and the other end is connected to the connector, and a screw handle is vertically installed above the connector, and the adjustable fixing frame is symmetrically installed on both sides of the fractured bone, and the relative traction connecting rods are connected to the connector, and the bolts tighten the connector, and the traction and pressure rod is parallel to the length direction of the bone. The beneficial effect of this patent document is that by fixing the two ends of the fracture, bidirectional traction can be achieved, and at the same time, the rotation of the fracture ends can be corrected by using the method of sliding the fixing sleeve in the fan-shaped groove, and after correcting the deformity of the fracture ends, the fracture ends can be pressurized by bidirectional pressure, so that the fracture ends are anatomically reset, and the operation is simple. However, the device of this patent is located on one side and is not symmetrical. When used for continuous traction, it will cause uneven force, affecting the efficacy and may even directly lead to traction failure. It is equipped with an adjustable fixing frame, which further increases the burden on the patient's one side. When the patient moves, the Kirschner nail may not be able to bear the torque generated by the entire device, causing harm to the human body, leading to treatment failure and even medical accidents. The traction force device and connector do not have a pressure indication function, so that the doctor is not clear about how much force is applied, causing great inconvenience.

[0006] In summary, there is an urgent need for a knee joint bidirectional traction device that is simple to operate, has a stable structure, is safe and reliable, has controllable traction force, a continuous and stable traction effect, can provide bidirectional traction, and does not require active resistance to traction force. Summary of the invention

[0007] The purpose of the present invention is to provide a knee joint bidirectional traction device which is simple to operate, stable in structure, safe and reliable, has controllable traction force, continuous and stable traction effect, can perform bidirectional traction, and does not require active resistance to traction force.

[0008] To achieve the above object, the technical solution adopted by the present invention is:

[0009] A knee joint bidirectional traction device comprises a plurality of traction rods, a plurality of connecting rods and a plurality of lifting connectors; the traction rod is a column structure, and a first connecting part is arranged at its end; one end of the connecting rod is provided with a second connecting part matched with the first connecting part, and the other end is provided with a connecting head; the second connecting part is detachably connected to the first connecting part; adjacent connecting rods can be movably connected via the lifting connectors; the traction rod can penetrate the bones and be arranged opposite to each other.

[0010] As a preferred technical solution, the traction rod includes a Kirschner wire, a Kirschner wire sleeve, and a fastening bolt. The Kirschner wire sleeve can be detachably connected to both ends of the Kirschner wire, and the Kirschner wire sleeve can be fastened to the Kirschner wire by the fastening bolt.

[0011] As a preferred technical solution, the first connecting part is a columnar structure with threaded holes and is symmetrically arranged at both ends of the traction rod. Correspondingly, the second connecting part is a columnar structure with external threads and is compatible with the first connecting part.

[0012] As a preferred technical solution, the connecting rod is vertically and detachably connected to the traction rod, the connecting rod is adjacent to another connecting rod opposite to it, and the connecting head of the connecting rod is a trapezoidal external thread structure.

[0013] As a preferred technical solution, the lifting connector includes a pressure sensor with a display, a sleeve section, a pressure groove, and a pressure nut; the pressure nut has a trapezoidal internal thread and can be movably connected to the connecting head. The sleeve section is a cylindrical hollow structure, and a pressure sensor with a display is provided on its side, and a pressure groove is provided at the end of the pressure sensor with a display.

[0014] As a preferred technical solution, a rechargeable battery is integrated inside the lifting connector.

[0015] As a preferred technical solution, the connecting rod has various length specifications.

[0016] As a preferred technical solution, the first connecting part can also be an anti-slip belt paved with a number of particles, and correspondingly, the second connecting part is an open-loop structure connected by control bolts, and the open-loop structure can be fastened with the anti-slip belt by means of control bolts.

[0017] The advantages of the present invention are:

[0018] 1. The traction rods are respectively placed in the femur and tibia in parallel, with the connecting rods vertically connected at both ends. The connecting rods are placed side by side and adjacent to each other and connected by the lifting connector, so that the torque between the relative traction rods can be adjusted by the lifting connector. The operation is convenient, the structure is simple, and two-way traction can be achieved by using the action force and reaction force.

[0019] 2. The lifting connector is provided with a pressure sensor with a display, which can clearly monitor the pressure value to ensure that it is maintained within the normal pressure range, thereby ensuring its therapeutic effect and preventing excessive traction from causing damage to ligaments, bones and muscles, or too little traction from resulting in poor therapeutic effect.

[0020] 3. The lifting connector movably connects two relative connecting rods together through the sleeve section and the pressure groove. The tube wall of the sleeve section and the groove wall of the pressure groove cooperate with the pressure nut to stably combine the three together, which is convenient for adjusting the corresponding pressure value and not easy to loosen.

[0021] 4. The traction rod includes a Kirschner wire, a Kirschner wire cannula, and a fastening bolt. The Kirschner wire is a commonly used traction surgical instrument, which makes the doctor more familiar with it during the operation. The fastening bolt cooperates with the bolt hole to fasten the Kirschner wire and the Kirschner wire cannula together, so that after the operation, the Kirschner wire cannula will not fall off, and after adjusting the depth of the connection between the Kirschner wire and the Kirschner wire cannula, it can still play a stable fastening role. The Kirschner wire cannula can also effectively prevent accidental injuries caused by the needle body.

[0022] 5. The connector and the pressure nut adopt trapezoidal threads, which have good stability, are not easy to loosen, have high root strength, and good processability, and can keep the pressure effect stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Attached Figure 1 A three-dimensional schematic diagram of a knee joint bidirectional traction device according to the present invention.

[0024] Attached Figure 2 It is a stereoscopic schematic diagram of basic components of a knee joint bidirectional traction device according to the present invention from a lower left perspective.

[0025] Attached Figure 3 It is a stereoscopic schematic diagram of basic components of a knee joint bidirectional traction device according to the present invention from an upper right perspective.

[0026] Attached Figure 4 It is a three-dimensional schematic diagram of the connecting rod and the pressure nut of the knee joint bidirectional traction device of the present invention.

[0027] Attached Figure 5 It is a front schematic diagram of a traction state of a knee joint bidirectional traction device of the present invention.

[0028] Attached Figure 6 It is a three-dimensional schematic diagram of another knee joint bidirectional traction device of the present invention. DETAILED DESCRIPTION

[0029] The present invention will be further described below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the content of the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms fall within the scope limited by the appended claims of the application equally.

[0030] The reference numerals and components involved in the drawings are as follows:

[0031] 1. Traction rod 2. Connecting rod 3. Lifting connector

[0032] 11.Kirschner wire 12.Kirschner wire cannula 13.Fix bolt

[0033] 14. Bolt hole 121. First connecting portion 122. Threaded hole

[0034] 21. Second connection part 22. Connector 31. Pressure sensor with display

[0035] 32. Socket section 33. Pressure groove 34. Pressure nut

[0036] 123. Anti-slip belt 211. Connecting platform 212. Control bolt

[0037] Example 1

[0038] Please see attached Figure 1 , attached Figure 1 A three-dimensional schematic diagram of a two-way traction device for a knee joint according to the present invention. A two-way traction device for a knee joint comprises two traction rods 1, four connecting rods 2, and two lifting connectors 3; see the attached Figure 2 , Attachment Figure 3 , attached Figure 2 1 is a bottom left perspective stereoscopic diagram of the basic components of a bidirectional traction device for a knee joint according to the present invention; Figure 3 The figure is a three-dimensional schematic diagram of the basic components of a two-way traction device for a knee joint according to the present invention from the upper right angle. The traction rod 1 is a columnar structure, and also includes a Kirschner wire 11, two Kirschner wire sleeves 12, and two fastening bolts 13. The Kirschner wire sleeve 12 is a hollow cylindrical structure with one end open and made of medical hard PVC material, and is also provided with a bolt hole 14; please refer to the attached Figure 1The Kirschner wire cannula 12 can be detachably connected to the two ends of the Kirschner wire 11, the fastening bolt 13 is adapted to the bolt hole 14, and the Kirschner wire 11 can be fastened to the Kirschner wire cannula 12 through the fastening bolt 13; the Kirschner wire cannula 12 is provided with a first connecting portion 121, the first connecting portion 121 is a columnar structure with a threaded hole 122, and is symmetrically arranged at both ends of the traction rod 1, that is, the positions of the first connecting portions 121 on the assembled traction rod 1 are symmetrical; please refer to the attached Figure 4 , attached Figure 4 It is a three-dimensional schematic diagram of the connecting rod and the pressure nut of a bidirectional traction device for a knee joint of the present invention. The connecting rod 2 is made of medical hard PVC material, one end of which is provided with a second connecting part 21 adapted to the first connecting part 121, and the other end is provided with a connecting head 22. The second connecting part 21 is a columnar structure with external threads. The connecting rod 2 is vertically and detachably connected to the traction rod 1. There is a prismatic handle between the second connecting part 21 and the connecting head 22 to facilitate the spiral connection between the first connecting part 121 and the second connecting part 21; the connecting head 22 is a trapezoidal external thread structure. The two relative connecting rods 2 are placed side by side and are movably connected through the lifting connector 3. Please refer to the attached Figure 2 , Attachment Figure 3 The lifting connector 3 includes a pressure sensor 31 with a display, a sleeve section 32, a pressure groove 33, and a pressure nut 34; the pressure nut 34 has a trapezoidal internal thread and can be movably connected to the connector 22. The sleeve section 32 is a cylindrical hollow structure with openings at both ends, and its side is connected to the pressure sensor 31 with a display. The pressure sensor 31 with a display also integrates a rechargeable battery that provides a working voltage. The pressure groove 33 is provided at the end, and the top of the pressure groove 33 is the pressure sensing end of the pressure sensor 31 with a display.

[0039] The use of the present invention: please refer to the attached Figure 5 , attached Figure 5It is a front view schematic diagram of the traction state of a knee joint bidirectional traction device of the present invention. After determining the distance between the traction rods 1, a connecting rod 2 of a suitable length is selected, and after corresponding knee joint traction surgery preparation, the Kirschner wire 11 is respectively passed through the femoral shaft and the tibial shaft horizontally by using existing surgical treatment methods, and the positions of the two Kirschner wires 11 are parallel, and the Kirschner wire sleeves 12 are respectively inserted into the two ends of the Kirschner wire 11, and the first connecting parts 121 on the two traction rods 1 are kept opposite to each other, and the fastening bolt 13 is screwed into the bolt hole 14, so that the end of the bolt is against the needle body of the Kirschner wire 11, so that it is fastened to the Kirschner wire sleeve 12 as a whole, forming the traction device. Rod 1; on one side of the knee joint, screw the pressure nut 34 into the connecting head 22 of the connecting rod 2, then insert the sleeve section 32 of the lifting connector 3 into the connecting rod 2, so that the sleeve section 32 is at the lower end of the pressure nut 34, screw the second connecting part 21 of the connecting rod 2 into the threaded hole 122 of the first connecting part 121, take another connecting rod 2 and screw it into the other first connecting part 121 placed opposite, forming a pair of connecting rods 2 placed side by side, and insert the end of the connecting head 22 of the other connecting rod 2 into the pressure groove 33 of the lifting connector 3. Similarly, the other side of the knee joint is also equipped with another pair of connecting rods 2 placed side by side in conjunction with the lifting connector 3, and the positions of the connecting rods 2 on both sides are relatively symmetrical. When the device is used for traction, it is only necessary to rotate the pressure nuts 34 on both sides. When the pressure nuts 34 push the lifting connector 3 downward, the lifting connector 3 also applies force to the connecting rod 2 connected thereto through the pressure groove 33. Through the action of the action force and the reaction force, the function of two-way traction is realized. At the same time, the pressure sensor 31 with display displays the sensed pressure value data on the display screen, and the pressure value can be monitored and adjusted at any time. Until the treatment is finished, the corresponding equipment is removed in turn.

[0040] It should be noted that: a two-way traction device for a knee joint comprises a plurality of traction rods 1, a plurality of connecting rods 2, and a plurality of lifting connectors 3. The traction rods 1 and the connecting rods 2 are vertically detachably connected, and the opposite connecting rods 2 can be movably connected through the lifting connectors 3. The traction rods 1 can be inserted into the bones and arranged oppositely, so that the torque between the relative traction rods 1 can be adjusted through the lifting connectors 3. The operation is convenient and the structure is simple. Bidirectional traction can be achieved through the action force and the reaction force. The traction rod 1 comprises a Kirschner wire 11, a Kirschner wire sleeve 12, and a fastening bolt 13. The Kirschner wire sleeve 12 is a hollow cylindrical structure with an open end. , which can effectively store the end of the Kirschner wire 1 to prevent accidental injury caused by the needle body. The fastening bolt 13 cooperates with the bolt hole 14 to fasten the Kirschner wire 11 and the Kirschner wire cannula 12 together, so that during continuous traction, the Kirschner wire 11 and the Kirschner wire cannula 12 can be stably fastened to prevent the Kirschner wire cannula 12 from falling off, and the depth of the connection between the Kirschner wire 11 and the Kirschner wire cannula 12 can be adjusted as needed; the first connecting part 121 is a columnar structure with threaded holes 122, and is symmetrically arranged at both ends of the traction rod 1. The symmetrical arrangement can make the force more uniform, and the second connecting part 21 is a columnar structure with external threads. The cylindrical structure can realize a detachable threaded connection with the first connecting part 121; by differentiating the position of the first connecting part 121 that needs to be placed oppositely on the traction rod 1 or differentiating the sleeve distance between the Kirschner wire 11 and the Kirschner wire sleeve 12, it is ensured that the connecting rods 2 facing each other can be staggered and placed side by side without interfering with each other, and the connecting heads 22 will not contact each other and cause mutual interference; the lifting connector 3 includes a pressure sensor 31 with a display, a sleeve section 32, a pressure groove 33, and a pressure nut 34, which can realize the function of connecting two connecting rods 2 placed side by side, and the required pressure can be achieved by lifting and adjusting The pressure sensor 31 with display can monitor the pressure data in real time to ensure that it is maintained within the normal pressure range. The sleeve section 32 and the pressure groove 33 are respectively connected to the two connecting rods 2, so that the two connecting rods 2 are connected together to realize the interaction between the action force and the reaction force, and keep the lifting connector 3 from falling off the connecting rod 2; the pressure nut 34 and the connector 22 have matching trapezoidal threads, and the lifting connector 3 can be lifted and lowered by adjusting the position of the pressure nut 34, thereby adjusting the pressure. The trapezoidal thread is not easy to loosen, has good craftsmanship, and has high root strength, which is conducive to the stability of pressure. The Kirschner wire 11, the pressure sensor 31 with display and the fastening bolt 13 can all be obtained by the existing technology, and the Kirschner wire sleeve 12 can also be made according to the selected Kirschner wire 11; the traction needle used in the traction rod 1 in this application is not limited to the Kirschner wire 11, and can also be a Steiner wire or other needle type that can be used as a traction needle. The length of the connecting rod 2 is different, and a suitable connecting rod 2 can be selected according to the actual distance between the traction rods 1.The usage and steps of this embodiment can be adjusted according to actual surgical needs.

[0041] Example 2

[0042] Please see attached Figure 6 , attached Figure 6 1 is a three-dimensional schematic diagram of another bidirectional traction device for knee joint of the present invention. A bidirectional traction device for knee joint comprises two traction rods 1, four connecting rods 2, and two lifting connectors 3; the traction rod 1 is a columnar structure, and also comprises a Kirschner wire 11, two Kirschner wire sleeves 12, and two fastening bolts 13; the Kirschner wire sleeve 12 is a hollow cylindrical structure with one end open, and a bolt hole 14 is also provided thereon; please refer to the attached Figure 1 , the Kirschner wire cannula 12 can be detachably connected to the two ends of the Kirschner wire 11, the fastening bolt 13 is adapted to the bolt hole 14, and the Kirschner wire 11 can be fastened to the Kirschner wire cannula 12 by the fastening bolt 13; a first connecting portion 121 is provided on the Kirschner wire cannula 12, and the first connecting portion 121 is an anti-slip belt 123 paved with a plurality of fine particles, and is symmetrically arranged at both ends of the traction rod 1, that is, the positions of the first connecting portions 121 on the assembled traction rod 1 are symmetrical; one end of the connecting rod 2 is provided with a second connecting portion 21 adapted to the first connecting portion 121, the second connecting portion 21 is an open-loop structure with an opening, and a connecting platform 211 with a threaded structure and arranged relatively is provided at the opening, and the second connecting portion 21 also includes a control bolt 212 for adjusting the tightness of the open loop, the second connecting portion 21 is detachably connected to the first connecting portion 121, and the other end of the connecting rod A connecting head 22 is provided, and the second connecting part 21 is a columnar structure with external threads. The connecting rod 2 is vertically and detachably connected to the traction rod 1, and a prismatic handle is provided between the second connecting part 21 and the connecting head 22; the connecting head 22 is a trapezoidal external thread structure, and the two relative connecting rods 2 are placed side by side and are movably connected through the lifting connector 3. The lifting connector 3 includes a pressure sensor 31 with display, a sleeve section 32, a pressure groove 33, and a pressure nut 34; the pressure nut 34 has a trapezoidal internal thread and can be movably connected to the connecting head 22. The sleeve section 32 is a cylindrical hollow structure with openings at both ends, and a pressure sensor 31 with display is connected to its side. The pressure sensor 31 with display also integrates a rechargeable battery that provides working voltage, and a pressure groove 33 (not shown in the figure) is provided at its end, and the top of the pressure groove 33 is the pressure sensing end of the pressure sensor 31 with display.

[0043] It should be noted that: this embodiment is basically the same as embodiment 1, the difference is that the connection structure and connection method of the first connection part 121 and the second connection part 21 have changed. The first connection part 121 is changed to an anti-slip belt 123 structure paved with a number of fine particles. Correspondingly, the second connection part 21 is changed to an open-loop structure connected by a control bolt 212. The open-loop structure of the second connection part 21 can be sleeved on the anti-slip belt 123 of the first connection part 121 and fastened with the control bolt 212. The anti-slip belt 123 can effectively prevent the relative sliding of the second connection part 21, thereby ensuring the stability of the device. The change in the connection method of the first connection part 121 and the second connection part 21 does not affect the effectiveness of the application.

[0044] The above is only a preferred embodiment of the present invention. It should be pointed out that ordinary technicians in this technical field can make several improvements and supplements without departing from the principle of the present invention. These improvements and supplements should also be regarded as the scope of protection of the present invention.

Claims

1. A knee joint bidirectional traction device, characterized in that: The invention comprises a plurality of traction rods, a plurality of connecting rods and a plurality of lifting connectors; the traction rod is a column structure, a first connecting part is provided at the end of the traction rod, a second connecting part matched with the first connecting part is provided at one end of the connecting rod, and a connecting head is provided at the other end, the second connecting part is detachably connected to the first connecting part, and adjacent connecting rods are movably connected through the lifting connector, the traction rod runs through the skeleton and is arranged oppositely, the lifting connector comprises a pressure sensor with display, a sleeve section, a pressure groove, and a pressure nut; the pressure nut has a trapezoidal internal thread and is movably connected to the connecting head, the sleeve section is a cylindrical hollow structure, a pressure sensor with display is provided on its side, a pressure groove is provided at the end of the pressure sensor with display, and the top of the pressure groove is the pressure sensing end of the pressure sensor with display, the lifting connector movably connects two opposite connecting rods together through the sleeve section and the pressure groove, a rechargeable battery is also integrated inside the lifting connector, and the connecting rod has various length specifications.

2. A knee joint bidirectional traction device according to claim 1, characterized in that: The first connection part is an anti-slip belt paved with a plurality of particles, and correspondingly, the second connection part is an open-loop structure connected by control bolts, and the open-loop structure is sleeved and fastened with the anti-slip belt by the control bolts.

Images