Body position placing device suitable for prone position OLIF operation

Abstract

The utility model discloses a body position placing device suitable for prone position OLIF surgery, which comprises two guide rails and two fixing assemblies, each fixing assembly comprises a base, two first supporting assemblies and two second supporting assemblies, each first supporting assembly comprises a first moving seat and a first cushion block installed on the first moving seat, and each second supporting assembly comprises a second moving seat and a second cushion block installed on the second moving seat. The second supporting assembly comprises a second moving seat, a telescopic stand column and a second cushion block, the lower end of the telescopic stand column is rotationally connected with the second moving seat, and the second cushion block is rotationally installed at the upper end of the telescopic stand column. According to the body position placing device, one side of the lumbar vertebra of a patient can be bent under the condition that the patient is in the prone position through the multi-point supporting principle, adjustment is convenient and flexible, and the bent position can be maintained.

Description

Technical Field

[0001] This utility model relates to the field of medical devices, specifically to a positioning device suitable for prone OLIF surgery. Background Technology

[0002] Currently, lumbar fusion surgery is widely used in the treatment of lumbar degenerative diseases and has achieved satisfactory results. Previously, posterior lumbar fusion surgery was commonly used clinically, but this procedure carries a high risk of complications. With advancements in medical technology, minimally invasive techniques have become increasingly prevalent in spinal neurosurgery, and oblique lateral interbody fusion (OLIF) is a novel minimally invasive interbody fusion surgery that has garnered significant clinical attention in recent years.

[0003] Oblique lateral interbody fusion (OLIF) is a popular minimally invasive technique for the lumbar spine in the world. It was first introduced by Mayer[1] in 1997, and Silvestre[2] first reported and officially named this minimally invasive technique in 2012. The OLIF technique uses the anatomical gap between the aorta / inferior vena cava (IVC) and the psoas major muscle to enter the intervertebral disc space without opening the spinal canal and without damaging the posterior muscles, ligaments and bony structures. At the same time, because it can remove enough intervertebral disc tissue, the contact area between the fusion device and the endplate is large, which can greatly increase the support strength of the fusion device. Therefore, the technique and concept of OLIF have been rapidly promoted and applied internationally.

[0004] Traditional OLIF surgical approach: The patient is placed in the right lateral decubitus position, and an oblique incision is made in the left abdomen, entering the retroperitoneal space through the intermuscular spaces of the external oblique, internal oblique, and transversus abdominis muscles. A working channel is placed between the abdominal aorta and the psoas major muscle, through which lumbar discectomy and intervertebral fusion are performed.

[0005] Posterior percutaneous pedicle screw fixation is the common internal fixation option for OLIF (Orthopaedic Laparoscopic Incision), and it is currently the "gold standard" in clinical application. It can effectively maintain three-column stability, limit flexion, extension, lateral bending, and rotation of the surgical segment, and reduce the incidence of fusion cage subsidence. However, it requires adjusting the patient from the lateral decubitus position to the prone position during the operation, which increases the operation and anesthesia time.

[0006] For patients with good anatomical condition and who are not obese, the prone position is a feasible option, which can improve efficiency and shorten operation time. In view of the above, it is necessary to use a novel prone positioning device to assist OLIF, so as to complete the implantation of the fusion cage and the fixation of the pedicle screw in the same position. Utility Model Content

[0007] To address the shortcomings of existing technologies, this invention provides a positioning device suitable for prone OLIF surgery, which is mainly used to enable patients to bend one side of the lumbar spine in a prone position and maintain the bent position.

[0008] To achieve the above objectives, this utility model is implemented through the following technical solution:

[0009] A positioning device for prone OLIF surgery includes two guide rails and two fixing components. The two guide rails extend in the front-back direction, and each fixing component is mounted on the two guide rails and its mounting position is adjustable in the front-back direction.

[0010] The fixing assembly includes a base, two first support components and two second support components. The base is mounted on two guide rails and its mounting position is adjustable in the front-to-back direction. The two first support components are located between the two second support components.

[0011] The first support assembly includes a first movable seat and a first pad mounted on the first movable seat. The first movable seat is mounted on a base and its mounting position is adjustable in the left-right direction.

[0012] The second support assembly includes a second movable seat, a telescopic column, and a second pad. The second movable seat is mounted on the base and its installation position is adjustable in the left and right directions. The lower end of the telescopic column is rotatably connected to the second movable seat, and the upper end of the telescopic column can swing in the front and back directions to adjust the angle. The second pad is rotatably mounted on the upper end of the telescopic column and is located above the first pad of the adjacent first support assembly.

[0013] The second support assembly also includes a ball seat and a ball head rod. The ball seat is installed at the upper end of the telescopic column, the second pad is installed on the ball head rod, and the ball head of the ball head rod is rotatably installed in the ball seat.

[0014] In one preferred embodiment, the base includes a base plate and two hinge seats, which are respectively mounted on two guide rails and their mounting positions are adjustable in the front-to-back direction. The two ends of the base plate are respectively placed on the two hinge seats and hinged to the two hinge seats. The base plate can rotate horizontally relative to each hinge seat.

[0015] In one preferred embodiment, the hinged seat includes a seat body, a rotating component, a button, and a spring. The top of the seat body is provided with a disc, and the bottom surface of the base plate is provided with a movable groove for receiving the disc. The disc is movably placed in the movable groove and can rotate in the movable groove. The bottom surface of the seat body is provided with a groove, and the seat body is inserted above the guide rail through the groove. The rotating component is rotatably mounted on the seat body.

[0016] The rotating part has a limiting part. By rotating the rotating part, the limiting part can be rotated to the bottom of the groove to prevent the guide rail from disengaging from the groove. The middle part of the button is hinged to the rotating part. The top surface of the button forms a protruding first stop. The seat body is provided with a slot corresponding to the position of the first stop. The bottom surface of the button forms a protruding second stop. A spring is provided between the bottom surface of the button and the rotating part.

[0017] Under the action of the spring, the first stop rotates into the slot, and the second stop rotates and abuts against one side of the rotating part. The cooperation between the first stop and the slot locks the rotation of the rotating part.

[0018] Pressing the button compresses the spring, and rotating the button causes the first stop to rotate out of the slot. Then, rotating the rotating part moves the limiting part away from the groove, thereby removing the hinge seat from the guide rail.

[0019] In one preferred embodiment, the base plate is provided with several sliding grooves along the left and right directions. The first and second movable seats are both equipped with sliders at the bottom, and the sliders are inserted into the sliding grooves. The first and second support components are both equipped with locking components, which include a wrench, a rubber pad, and a fixing block. The bottom surfaces of the first and second movable seats are provided with receiving grooves. The fixing block and the rubber pad are located in the receiving grooves. The rubber pad is pasted on the bottom surface of the fixing block and contacts the base plate. The wrench is rotatably mounted on the fixing block and has a protrusion.

[0020] By turning the wrench, the protrusion pushes against the bottom surface of the first or second movable seat, and the wrench is subjected to downward pressure, which in turn compresses the rubber pad so that the rubber pad fits tightly against the base plate, thereby fixing the first or second support assembly.

[0021] By turning the wrench, the protrusion moves away from the bottom surface of the first or second movable seat, thereby allowing the first and second support components to move along the slide groove.

[0022] In one preferred embodiment, the telescopic column includes an outer column and a rack with its lower end inserted inside the outer column. A ball seat is fixed to the upper end of the rack, and the length of the rack extending beyond the outer column is adjustable. A second adjusting screw for positioning the rack height is threaded onto the outer column.

[0023] In one preferred embodiment, the second movable seat is provided with a first protrusion and a second protrusion. The first protrusion, the outer column, and the second protrusion are all provided with through holes. The first protrusion has a toothed surface on the side near the second protrusion. The outer column is located between the first protrusion and the second protrusion. The outer column has a toothed surface on the side near the first protrusion. The toothed surface on the outer column meshes with the toothed surface on the first protrusion. A screw passes through the through holes on the first protrusion, the outer column, and the second protrusion in sequence and is then tightened with a nut so that the first protrusion and the second protrusion clamp the outer column, thereby limiting the rotation angle of the outer column. Loosening the nut allows the outer column to rotate. The meshing position of the toothed surface of the outer column and the toothed surface of the first protrusion can be adjusted.

[0024] In one preferred embodiment, a third support assembly is configured on one of the guide rails, located between two fixed components. The third support assembly includes a first bracket, a second bracket, a third bracket, and a third pad. The first bracket is fitted onto one of the guide rails and is movable along the guide rail. A third adjusting screw is installed on the first bracket to lock its position on the guide rail. The second bracket is vertically inserted into the first bracket, and a fourth adjusting screw is installed on the first bracket to lock its height. The third bracket is inserted into the second bracket in a left-right direction, and a fifth adjusting screw is installed on the second bracket to lock its horizontal position. The third pad is installed on the third bracket.

[0025] In one preferred embodiment, a first adjusting screw is threaded onto the ball seat. By rotating the first adjusting screw, one end of the first adjusting screw abuts against the ball head of the ball joint, thereby locking the second pad. Loosening the first adjusting screw allows the second pad to resume rotation.

[0026] The positioning device for prone OLIF surgery provided by this utility model has the following beneficial effects:

[0027] In use, the patient lies prone with two first pads placed on the abdomen and two on the chest. A second pad is placed on each side of the patient's chest wall and on each side of the iliac crest. The two fixing components can be adjusted in the front-to-back direction to accommodate the patient's height. Each first and second pad can be adjusted left-to-right to accommodate the patient's body width. Each second pad can swing left-to-right and rotate at a large angle to ensure accurate placement against the patient's side. This positioning device is suitable for patients of various ages, heights, and body types. Through multi-point support, it allows the patient to bend one side of the lumbar spine in a prone position, with convenient and flexible adjustment and the ability to maintain the bent position. Attached Figure Description

[0028] Figure 1This is a first three-dimensional structural schematic diagram of a body positioning device suitable for prone OLIF surgery according to an embodiment of the present invention;

[0029] Figure 2 yes Figure 1 A partial structural cross-sectional view of a positioning device suitable for prone OLIF surgery;

[0030] Figure 3 yes Figure 1 A second three-dimensional structural diagram of a positioning device suitable for prone OLIF surgery;

[0031] Figure 4 yes Figure 1 A schematic diagram of the third-dimensional structure of a positioning device suitable for prone OLIF surgery;

[0032] Figure 5 This is a three-dimensional structural diagram of the hinge seat according to an embodiment of the present utility model;

[0033] Figure 6 yes Figure 5 A schematic diagram of the hinged seat without the rotating component;

[0034] Figure 7 yes Figure 6 Side view of the hinged seat;

[0035] Figure 8 This is a three-dimensional structural diagram of the third support component according to an embodiment of the present utility model;

[0036] Figure 9 This is a schematic diagram of the first movable seat according to an embodiment of the present utility model;

[0037] Figure 10 This is a schematic diagram of a wrench installed on a fixed block according to an embodiment of the present invention;

[0038] Figure 11 This is a first three-dimensional structural diagram of the base according to an embodiment of the present utility model;

[0039] Figure 12 yes Figure 11 A schematic diagram of the second three-dimensional structure of the base. Detailed Implementation

[0040] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0041] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0042] like Figures 1 to 12 As shown, this embodiment discloses a positioning device suitable for prone OLIF surgery, including two guide rails 1 and two fixing components. The two guide rails 1 extend in the front-back direction, and each fixing component is mounted on the two guide rails 1 with an adjustable position in the front-back direction. The fixing components include a base 2, two first support components 3, and two second support components 4. The base 2 is mounted on the two guide rails 1 with an adjustable position in the front-back direction, and the two first support components 3 are located between the two second support components 4. The first support component 3 includes a first movable seat 31 and a mounting base 32. A first pad 32 is mounted on a movable base 31, which is installed on a base 2 and its installation position is adjustable in the left and right directions. A second support assembly 4 includes a second movable base 41, a telescopic column 43, and a second pad 42. The second movable base 41 is mounted on the base 2 and its installation position is adjustable in the left and right directions. The lower end of the telescopic column 43 is rotatably connected to the second movable base 41, and the upper end of the telescopic column 43 can swing in the front and back directions to adjust the angle. The second pad 42 is rotatably mounted on the upper end of the telescopic column 43 and is located above the first pad 32 of the adjacent first support assembly 3. Specifically, the second support assembly 4 also includes a ball seat 44 and a ball head rod 45. The ball seat 44 is mounted on the upper end of the telescopic column 43, and the second pad 42 is mounted on the ball head rod 45. The ball head of the ball head rod 45 is rotatably mounted in the ball seat 44. The ball joint 45 and the ball seat 44 work together to make the second pad 42 rotate flexibly and at a large angle, and the rotation angle of the second pad 42 can be easily adjusted according to the patient's body shape.

[0043] In order to keep the second pad 42 at a predetermined rotation angle, such as Figure 4 A first adjusting screw 46 is threaded onto the ball seat 44. By rotating the first adjusting screw 46, one end of the screw 46 abuts against the ball head of the ball head rod 45, thereby locking the second pad 42. Loosening the first adjusting screw 46 allows the second pad 42 to resume rotation. In other embodiments, other methods can be used to fix the rotation angle of the second pad 42. For example, multiple limiting grooves can be provided on the spherical cavity sidewall of the ball seat 44, and limiting protrusions can be provided on the ball head of the ball head rod 45. By engaging the limiting protrusions with different limiting grooves, the second pad 42 can be fixed to a certain rotation angle.

[0044] This positioning device features four first pads 32 and four second pads 42. Both first and second pads 32 are soft (e.g., sponge pads) to enhance patient comfort. In use, the patient lies prone with two first pads 32 placed on the abdomen and two on the chest. One second pad 42 is positioned on each side of the chest wall and on each side of the iliac crest. Each second pad 42 is rotatable; by adjusting one or more second pads 42, the lumbar spine can bend to one side. This positioning device can be used with a Jackson mattress or a carbon fiber mattress with a suspended abdomen. Through multi-point support, it allows the patient to bend their lumbar spine to one side while prone and maintain this position.

[0045] The spacing between the two fixing components is adjustable to accommodate patients of different heights. The fixing components are wider than the human body and have considerable weight, therefore requiring a design that facilitates movement. The base 2 includes a base plate 21 and two hinge seats 22. The two hinge seats 22 are respectively mounted on two guide rails 1, and their positions are adjustable along the front-to-back direction. The two ends of the base plate 21 are respectively placed on and hinged to the two hinge seats 22. The base plate 21 can rotate horizontally relative to each hinge seat 22, meaning that any one hinge seat 22 can be moved independently. This makes moving the base plate 21 more convenient and flexible; therefore, only one operator is needed to adjust the position of the base plate 21.

[0046] The hinge seat 22 includes a seat body 221, a rotating component 222, a button 223, and a spring 224. The top of the seat body 221 is provided with a disc 225, and the bottom surface of the base plate 21 is provided with a movable groove 211 for accommodating the disc 225. The disc 225 is movably placed in the movable groove 211 and can rotate in the movable groove 211, thereby realizing the hinge between the base plate 21 and the hinge seat 22. The bottom surface of the seat 221 is provided with a groove 2211. The seat 221 is inserted above the guide rail 1 through the groove 2211. The rotating member 222 is rotatably mounted on the seat 221. The rotating member 222 has a limiting part 2221. By rotating the rotating member 222, the limiting part 2221 can be rotated to the bottom of the groove 2211 to prevent the guide rail 1 from disengaging from the groove 2211. The middle part of the button 223 is hinged to the rotating member 222. The top surface of the button 223 forms a protruding first stop part 2231. The seat 221 is provided with a slot 2212 corresponding to the position of the first stop part 2231. The bottom surface of the button 223 forms a protruding second stop part 2232. A spring 224 is provided between the bottom surface of the button 223 and the rotating member 222. Under the action of spring 224, the first stop 2231 rotates into the slot 2212, and the second stop 2232 rotates and abuts against one side of the rotating member 222. The cooperation between the first stop 2231 and the slot 2212 locks the rotation of the rotating member 222. By pressing button 223, spring 224 is compressed, and the rotation of button 223 causes the first stop to rotate and disengage from the slot 2212. This allows the rotating member 222 to rotate, causing the limiting part 2221 to move away from the groove 2211, thereby removing the hinge seat 22 from the guide rail 1. Only one hand is needed to operate button 223 to lock the position of the hinge seat 22 on the guide rail 1 and unlock the hinge seat 22 to remove it from the guide rail 1, facilitating the assembly and adjustment of the hinge seat 22's position, and consequently, the adjustment of the position of the fixing components.

[0047] Preferably, the first pad 32 is not horizontally positioned; the first pad 32 located on the left side of the patient is tilted 45° to the right, and the first pad 32 located on the right side of the patient is tilted 45° to the left.

[0048] The base plate 21 has several left-right sliding grooves 212. Both the first movable seat 31 and the second movable seat 41 have sliders 5 mounted on their bottoms. The sliders 5 match the sliding grooves 212 and are inserted into them, allowing the first support assembly 3 and the second support assembly 4 to move along the sliding grooves 212. The positions of the first support assembly 3 and the second support assembly 4 can be adjusted according to the patient's body shape. Preferably, the sliding groove 212 is a T-shaped groove (or a dovetail groove, or other shapes). One end of the slider 5 has a boss that matches the T-shaped groove, which is inserted into the sliding groove 212 to prevent the slider 5 from disengaging from the sliding groove 212.

[0049] Once the first support assembly 3 is positioned on the base 2, it needs to be secured. Preferably, the first support assembly 3 is equipped with a locking component. The locking component includes a wrench 6, a rubber pad 10, and a fixing block 7. The bottom surface of the first movable seat 31 is provided with a receiving groove 8. The fixing block 7 and the rubber pad 10 are located in the receiving groove 8. The rubber pad 10 is adhered to the bottom surface of the fixing block 7 and contacts the base plate 21. The wrench 6 is rotatably mounted on the fixing block 7. The wrench 6 has a protrusion 61. By rotating the wrench 6, the protrusion 61 pushes against the bottom surface of the first movable seat 31. The wrench 6 is subjected to downward pressure and moves downward, thereby causing the rubber pad 10 to fit tightly against the base plate 21, thus increasing the friction between the rubber pad 10 and the base 2, thereby preventing the first support assembly 3 from moving and achieving the purpose of locking the first support assembly 3. By turning the wrench 6, the force between the protrusion 61 and the first movable seat 31 is removed, the force on the rubber pad 10 is reduced, and therefore the friction between the rubber pad 10 and the base plate 21 is reduced, thereby allowing the first support assembly 3 to move.

[0050] Similarly, once the second support assembly 4 is positioned on the base 2, it needs to be secured. Preferably, the second support assembly 4 is equipped with a locking component. The locking component includes a wrench 6, a rubber pad 10, and a fixing block 7. The bottom surface of the second movable seat 41 is provided with a receiving groove 8. The fixing block 7 and the rubber pad 10 are located in the receiving groove 8. The rubber pad 10 is adhered to the bottom surface of the fixing block 7 and contacts the base plate 21. The wrench 6 is rotatably mounted on the fixing block 7. The wrench 6 has a protrusion 61. By rotating the wrench 6, the protrusion 61 pushes against the bottom surface of the second movable seat 41. The wrench 6 is subjected to downward pressure, which in turn puts pressure on the rubber pad 10 to make it tightly adhere to the base plate 21, thereby increasing the friction between the rubber pad 10 and the base plate 21, thus preventing the second support assembly 4 from moving and achieving the purpose of locking the second support assembly 4. By turning the wrench 6, the force between the protrusion 61 and the second movable seat 41 is removed, the force on the rubber pad 10 is reduced, and therefore the friction between the rubber pad 10 and the base plate 21 is reduced, thereby allowing the second support assembly 4 to move.

[0051] The locking mechanism allows the first support component 3 and the second support component 4 to be fixed at any position on the base 2. Turning the wrench 6 locks or unlocks either the first support component 3 or the second support component 4, making operation convenient and allowing for easy adjustment of the positions of the first support component 3 and the second support component 4 according to the patient's body shape, thus offering good practicality. In other embodiments, the locking method for the first support component 3 and the second support component 4 can also employ other technical solutions. For example, threaded holes can be provided on the first movable seat 31 and the second movable seat 41, and multiple screws can be installed on the base 2 (or a strip-shaped through groove can be provided on the base 2, with screws installed in the strip-shaped through groove). The positions of the first movable seat 31 and the second movable seat 41 can be fixed by locking the screws into the threaded holes. The first movable seat 31 and the second movable seat 41 can also be fixed to the base 2 by other fasteners.

[0052] Preferably, the top surface of the fixing block 7 is provided with a groove 2212 extending in the front-rear direction, and the wrench 6 is engaged in the groove 2212 and can rotate. The way the wrench 6 is rotatably mounted on the fixing block 7 is not limited to the above description. For example, a through hole can be provided on the fixing block 7, and the wrench 6 can be rotatably mounted in the through hole. The wrench 6 can be a single part or assembled from multiple parts.

[0053] like Figure 4 The telescopic column 43 includes an outer column 431 and a rack 432 with its lower end inserted inside the outer column 431. A ball seat 44 is fixed to the upper end of the rack 432. The length of the rack 432 extending out of the outer column 431 is adjustable. A second adjusting screw 44 is threaded onto the outer column 431. By tightening the second adjusting screw 44, one end of the second adjusting screw 44 abuts against the rack 432, thereby fixing the rack 432 to determine its height, which in turn determines the height of the second pad 42.

[0054] The second movable seat 41 is provided with a first protrusion 411 and a second protrusion 412. The first protrusion 411, the outer column 431 and the second protrusion 412 are all provided with through holes. The first protrusion 411 has a toothed surface on the side near the second protrusion 412. The outer column 431 is located between the first protrusion 411 and the second protrusion 412. The outer column 431 has a toothed surface on the side near the first protrusion 411. The toothed surface on the outer column 431 meshes with the toothed surface on the first protrusion 411. A self-tapping screw 45 ( Figure 2 After passing through the through holes on the first protrusion 411, the outer column 431, and the second protrusion 412 in sequence, it is nut 48 ( Figure 4Tightening the nut 48 limits the rotation angle of the outer column 431. Loosening the nut 48 allows the outer column 431 to rotate. The meshing position between the teeth of the outer column 431 and the teeth of the first protrusion 411 can be adjusted, thereby changing the angle of the outer column 431. In other embodiments, multiple through holes can be provided on the first protrusion 411, and several threaded holes can be provided on the outer column 431. Multiple screws can be installed on the first protrusion 411 to lock the outer column 431 in place. Loosening the screws allows the outer column 431 to rotate.

[0055] The body positioning device also includes a third support assembly 9, located between the two fixed assemblies. The third support assembly 9 comprises a first bracket 91, a second bracket 92, a third bracket 93, and a third pad 94. The first bracket 91 is fitted onto one of the guide rails 1 and can move along the guide rail 1. A third adjusting screw 95 is installed on the first bracket 91, locking its position on the guide rail 1 by pressing the third adjusting screw 95 against it. The second bracket 92 is vertically inserted into the first bracket 91, and a fourth adjusting screw 96 is installed on the first bracket 91 to lock its height. The third bracket 93 is inserted into the second bracket 92 in a left-right direction, and a fifth adjusting screw 97 is installed on the second bracket 92 to lock its horizontal position. The third pad 94 is installed on the third bracket 93. By loosening the third adjusting screw 95, the first bracket 91 can move along the guide rail 1; after it is in place, the third adjusting screw 95 is tightened. Rotating the fourth adjusting screw 96 adjusts the height of the second support 92, and loosening the fifth adjusting screw 97 adjusts the horizontal position of the third support 93. Therefore, the front-back, left-back, and up-down positions of the third pad 94 can be adjusted according to the patient's body shape. The third pad 94 assists the four second pads 42, employing a five-point support principle to help the patient maintain a predetermined bending position.

[0056] The above-described embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. These modifications or substitutions do not cause the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model. Therefore, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

Claims

1. A patient positioning device suitable for prone OLIF surgery, characterized in that, It includes two guide rails and two fixing components. The two guide rails extend in the front-to-back direction, and each fixing component is mounted on the two guide rails and its mounting position is adjustable in the front-to-back direction. The fixing assembly includes a base, two first support components and two second support components. The base is mounted on two guide rails and its mounting position is adjustable in the front-to-back direction. The two first support components are located between the two second support components. The first support assembly includes a first movable seat and a first pad mounted on the first movable seat. The first movable seat is mounted on a base and its mounting position is adjustable in the left-right direction. The second support assembly includes a second movable seat, a telescopic column, and a second pad. The second movable seat is mounted on the base and its installation position is adjustable in the left and right directions. The lower end of the telescopic column is rotatably connected to the second movable seat, and the upper end of the telescopic column can swing in the front and back directions to adjust the angle. The second pad is rotatably mounted on the upper end of the telescopic column and is located above the first pad of the adjacent first support assembly. The second support assembly also includes a ball seat and a ball head rod. The ball seat is installed at the upper end of the telescopic column, the second pad is installed on the ball head rod, and the ball head of the ball head rod is rotatably installed in the ball seat.

2. The patient positioning device for prone OLIF surgery according to claim 1, characterized in that, The base includes a base plate and two hinge seats. The two hinge seats are respectively mounted on two guide rails and their mounting positions are adjustable in the front-to-back direction. The two ends of the base plate are respectively placed on the two hinge seats and hinged to the two hinge seats. The base plate can rotate horizontally relative to each hinge seat.

3. The patient positioning device for prone OLIF surgery according to claim 2, characterized in that, The hinged seat includes a seat body, a rotating component, a button, and a spring. The top of the seat body is provided with a disc, and the bottom surface of the base plate is provided with a movable groove for accommodating the disc. The disc is movably placed in the movable groove and can rotate in the movable groove. The bottom surface of the seat body is provided with a groove, and the seat body is inserted into the guide rail through the groove. The rotating component is rotatably mounted on the seat body. The rotating part has a limiting part. By rotating the rotating part, the limiting part can be rotated to the bottom of the groove to prevent the guide rail from disengaging from the groove. The middle part of the button is hinged to the rotating part. The top surface of the button forms a protruding first stop. The seat body is provided with a slot corresponding to the position of the first stop. The bottom surface of the button forms a protruding second stop. A spring is provided between the bottom surface of the button and the rotating part. Under the action of the spring, the first stop rotates into the slot, and the second stop rotates and abuts against one side of the rotating part. The cooperation between the first stop and the slot locks the rotation of the rotating part. Pressing the button compresses the spring, and rotating the button causes the first stop to rotate out of the slot. Then, rotating the rotating part moves the limiting part away from the groove, thereby removing the hinge seat from the guide rail.

4. The patient positioning device for prone OLIF surgery according to claim 2, characterized in that, The base plate has several sliding grooves along the left and right directions. The first and second movable seats are both equipped with sliders at the bottom. The sliders are inserted into the sliding grooves. The first and second support components are both equipped with locking components. The locking components include a wrench, a rubber pad, and a fixing block. The bottom surfaces of the first and second movable seats are both provided with receiving grooves. The fixing block and the rubber pad are located in the receiving grooves. The rubber pad is pasted on the bottom surface of the fixing block and contacts the base plate. The wrench is rotatably mounted on the fixing block and has a protrusion. By turning the wrench, the protrusion pushes against the bottom surface of the first or second movable seat, and the wrench is subjected to downward pressure, which in turn compresses the rubber pad so that the rubber pad fits tightly against the base plate, thereby fixing the first or second support assembly. By turning the wrench, the protrusion moves away from the bottom surface of the first or second movable seat, thereby allowing the first and second support components to move along the slide groove.

5. The patient positioning device for prone OLIF surgery according to claim 1, characterized in that, The telescopic column includes an outer column and a rack with its lower end inserted inside the outer column. A ball seat is fixed to the upper end of the rack, and the length of the rack extending beyond the outer column is adjustable. A second adjusting screw for positioning the rack height is threaded onto the outer column.

6. The patient positioning device for prone OLIF surgery according to claim 5, characterized in that, The second movable seat is provided with a first protrusion and a second protrusion. The first protrusion, the outer column and the second protrusion are all provided with through holes. The first protrusion has a toothed surface on the side near the second protrusion. The outer column is located between the first protrusion and the second protrusion. The outer column has a toothed surface on the side near the first protrusion. The toothed surface on the outer column meshes with the toothed surface on the first protrusion. A screw passes through the through holes on the first protrusion, the outer column and the second protrusion in sequence and is then tightened with a nut so that the first protrusion and the second protrusion clamp the outer column, thereby limiting the rotation angle of the outer column. Loosening the nut allows the outer column to rotate. The meshing position of the toothed surface of the outer column and the toothed surface of the first protrusion can be adjusted.

7. The patient positioning device for prone OLIF surgery according to any one of claims 1 to 6, characterized in that, A third support assembly is configured on one of the guide rails, located between two fixed assemblies. The third support assembly includes a first bracket, a second bracket, a third bracket, and a third pad. The first bracket is fitted onto one of the guide rails and can move along the guide rail. A third adjusting screw is installed on the first bracket to lock its position on the guide rail. The second bracket is vertically inserted into the first bracket. A fourth adjusting screw is installed on the first bracket to lock its height. The third bracket is inserted into the second bracket in a left-right direction. A fifth adjusting screw is installed on the second bracket to lock its horizontal position. The third pad is installed on the third bracket.

8. The patient positioning device for prone OLIF surgery according to claim 1, characterized in that, A first adjusting screw is threaded onto the ball seat. By rotating the first adjusting screw, one end of the first adjusting screw abuts against the ball head of the ball joint, thereby locking the second pad. Loosening the first adjusting screw allows the second pad to resume rotation.

Images