Vertebral distraction device

Abstract

The present invention provides a vertebral body distraction device, which is used to be arranged in a vertebral body and distract the vertebral body. The vertebral body distraction device includes a main body, two support plates and a distraction assembly. The main body has an inner cavity and an upper opening and a lower opening respectively connected to the inner cavity. The two support plates are respectively arranged at the upper opening and the lower opening, and the support plates and the main body are slidably matched to be able to distract relative to the main body. The distraction assembly includes a screw and two sets of gear shafts. The screw is rotatably arranged in the inner cavity, and the screw is a tubular structure with a tubular cavity and a through hole. The two sets of gear shafts are respectively located above and below the screw. The present invention can drive the two sets of gear shafts to rotate synchronously through the rotation of the screw, and the push arms of the two sets of gear shafts push the two support plates to distract outward relative to the main body. When the two support plates are not distracted, the outer surfaces of the two side walls and the outer surfaces of the two support plates jointly define a cylindrical surface or an elliptical cylindrical surface, and the corresponding axes of the cylindrical surface and the elliptical cylindrical surface extend along the first horizontal direction.

Description

Technical Field

[0001] The present invention relates to the technical field of spinal vertebral distraction, and in particular to a vertebral distraction device. Background Art

[0002] When a vertebral compression fracture is caused by trauma, especially when accompanied by osteoporosis, the usual treatment method includes: first, a minimally invasive channel is established through the pedicle, then a special instrument is used to restore the original height of the vertebral body, and then bone cement is injected into the vertebral body through the minimally invasive channel to fix it. Among them, the existing instruments for restoring the height of the vertebral body propose to use balloon expansion or mechanical arm expansion.

[0003] The shortcoming of the balloon structure is that the supporting force is smaller than that of the mechanical arm. When the vertebral compression fracture is severe, it cannot be fully expanded to restore the normal vertebral height. After the overall compression of the vertebral body, a large cavity is likely to appear, which requires more bone cement to be filled, which is easy to cause bone cement leakage. The mechanical arm structure currently on the market is divided into two structures: extrusion and expansion to the inside or extrusion and expansion to both ends. The support points of the structure that squeezes and expands to the inside are concentrated in the center of the upper / lower expansion piece. The expansion piece is prone to unilateral tilt due to uneven force during the expansion process; the structure that squeezes and expands to both ends distributes the support points at both ends of the upper / lower expansion piece, making the upper / lower expansion piece more stable. However, since the connecting rod is small and cannot be ensured to be in the vertical direction, the connecting rod is prone to continuous pressure when tilting, resulting in fatigue bending, fracture, etc., and long-term stable fixation cannot be achieved. It still needs to be stabilized with the help of filling bone cement. Summary of the invention

[0004] A main purpose of the present invention is to overcome at least one of the defects of the above-mentioned prior art and to provide a vertebral distraction device with uniform force, dispersed stress, and not prone to unilateral tilt or fatigue bending and fracture.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] According to one aspect of the present invention, a vertebral body distraction device is provided, which is used to be arranged in a vertebral body and distract the vertebral body. The vertebral body distraction device includes a main body, two support plates and a distraction assembly. The main body has an inner cavity and an upper opening and a lower opening respectively connected to the inner cavity. The two support plates are respectively arranged at the upper opening and the lower opening, and the support plates are slidably matched with the main body to be distracted relative to the main body. The distraction assembly includes a screw and two sets of gear shafts. The screw is rotatably arranged in the inner cavity along a first horizontal direction, the screw is a tubular structure and has a tubular cavity, and one end of the screw with a screw head is open and the other end is closed, and the screw is provided with a through hole. The two sets of gear shafts are respectively located above and below the screw, each set of gear shafts includes at least one gear shaft, the gear shaft is rotatably arranged in the inner cavity along a second horizontal direction perpendicular to the first horizontal direction, the gear shaft is provided with gears and push arms spaced along the second horizontal direction, the gear is meshed with the screw, and the push arm extends radially along the gear shaft. The vertebral body distraction device is configured to be able to drive the two sets of gear shafts to rotate synchronously through the rotation of the screw, and the pushing arms of the two sets of gear shafts push the two support plates to be distracted outward relative to the main body. The main body has two side walls parallel to the second horizontal direction, and the outer surfaces of the two side walls and the outer surfaces of the two support plates both include cylindrical arc surfaces or elliptical cylinder arc surfaces. When the two support plates are not distracted, the outer surfaces of the two side walls and the outer surfaces of the two support plates jointly define a cylindrical surface or an elliptical cylinder surface, and the corresponding axes of the cylindrical surface and the elliptical cylinder surface extend along the first horizontal direction.

[0007] According to one embodiment of the present invention, the main body has two end walls opposite to each other in a first horizontal direction, and the support plate has two end walls opposite to each other in the first horizontal direction. When the two support plates are not opened, the main body and the two support plates jointly define a cylindrical structure or an elliptical cylindrical structure.

[0008] According to one embodiment of the present invention, a plurality of through holes are formed on the screw rod; wherein the plurality of through holes are arranged at intervals along a first horizontal direction, and / or the plurality of through holes are arranged at intervals along the circumference of the screw rod.

[0009] According to one embodiment of the present invention, the main body has two end walls opposite to each other in a first horizontal direction, and adjustment holes are respectively opened on the two end walls. The two ends of the screw rod are respectively rotatably arranged in the two adjustment holes, and the screw head is exposed to the outside of one of the end walls through one of the adjustment holes.

[0010] According to one embodiment of the present invention, the end wall where the screw head is exposed is provided with a locking hole in the vertical direction, one end opening of the locking hole is located at the top or bottom of the end wall, and the other end opening is connected to the adjustment hole provided in the end wall. The vertebral distraction device further comprises a locking pin, which is detachably disposed in the locking hole to lock the screw in the horizontal direction.

[0011] According to one embodiment of the present invention, a sliding block is provided on the surface of the support plate facing the main body, and the main body is provided with a sliding groove, the sliding groove extends in a vertical direction, and the sliding block is slidably matched with the sliding groove.

[0012] According to one embodiment of the present invention, the support plate is provided with a plurality of pairs of sliders, the plurality of pairs of sliders are arranged at intervals along the first horizontal direction, and the two sliders in the same pair are arranged at intervals along the second horizontal direction. The main body is provided with a plurality of pairs of slide grooves, the plurality of pairs of slide grooves are arranged at intervals along the first horizontal direction, and the two slide grooves in the same pair are arranged at intervals along the second horizontal direction; wherein the plurality of sliders are slidably matched in the plurality of slide grooves in a one-to-one correspondence.

[0013] According to one embodiment of the present invention, the number of the sliders provided on the two support plates is equal and one-to-one corresponding, wherein the two support plates share a plurality of the slide grooves, and each of the slide grooves simultaneously slides with two corresponding sliders belonging to the two support plates.

[0014] According to one embodiment of the present invention, each group of the gear shafts includes a plurality of the gear shafts, and the plurality of gear shafts are distributed at intervals along a first horizontal direction.

[0015] According to one embodiment of the present invention, each gear shaft is provided with a plurality of pushing arms, a portion of the plurality of pushing arms is located on one side of the gear in the first horizontal direction, and another portion of the plurality of pushing arms is located on the other side of the gear in the first horizontal direction.

[0016] It can be seen from the above technical solutions that the advantages and positive effects of the vertebral distraction device proposed by the present invention are:

[0017] The vertebral distraction device proposed in the present invention has the advantages of simple structure and easy operation while realizing the synchronous distraction of the upper and lower support plates. Moreover, since the distraction function is realized by adopting the coordinated design of the screw and the gear shaft, the meshing characteristics of the screw and the gear also enable the present invention to have a self-locking function, further optimizing the stability of the structure. Furthermore, the vertebral distraction device proposed in the present invention designs the main body and the two support plates to be roughly cylindrical or elliptical when not distracted, so that the process of the vertebral distraction device entering the vertebral body through the pedicle minimally invasive channel is smoother and more suitable for the application environment inside the vertebral body. In addition, by arranging a lumen and a through hole in the screw, the present invention can inject fillers such as bone cement into the vertebral body through the lumen and the through hole, further meeting the application needs inside the vertebral body. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Various objects, features and advantages of the present invention will become more apparent by considering the following detailed description of preferred embodiments of the present invention in conjunction with the accompanying drawings. The accompanying drawings are merely exemplary illustrations of the present invention and are not necessarily drawn to scale. In the accompanying drawings, the same reference numerals always refer to the same or similar parts. Among them:

[0019] Figure 1 is an exploded schematic diagram showing a vertebral distraction device according to an exemplary embodiment;

[0020] Figure 2 yes Figure 1 A three-dimensional view of the main body of the vertebral distraction device is shown;

[0021] Figure 3 yes Figure 1 A front view of the main body of the vertebral distraction device is shown;

[0022] Figure 4 yes Figure 1 A left side view of the main body of the vertebral distraction device is shown;

[0023] Figure 5 yes Figure 1 A three-dimensional view of an upper support plate of a vertebral distraction device is shown;

[0024] Figure 6 yes Figure 1 A front view of an upper support plate of a vertebral distraction device is shown;

[0025] Figure 7 yes Figure 1 A left side view of the upper support plate of the vertebral distraction device is shown;

[0026] Figure 8 yes Figure 1 A three-dimensional view of the lower support plate of the vertebral distraction device is shown;

[0027] Fig. 9 yes Figure 1 A front view of the lower support plate of the vertebral distraction device is shown;

[0028] Fig.10 yes Figure 1 A left side view of the lower support plate of the vertebral distraction device is shown;

[0029] Fig.11 yes Figure 1 A three-dimensional view of a screw of a vertebral distraction device is shown;

[0030] Fig.12 yes Figure 1 A front view of the screw of the vertebral distraction device is shown;

[0031] Fig.13 yes Figure 1 A front view of the gear shaft of the vertebral distraction device is shown;

[0032] Fig.14 yes Figure 1 A left side view of the gear shaft of the vertebral distraction device is shown;

[0033] Fig.15 yes Figure 1 A front view of a locking pin of a vertebral distraction device is shown.

[0034] The following are the descriptions of the reference numerals:

[0035] 100. Subject;

[0036] 110. Side wall;

[0037] 111. Inner wall part;

[0038] 112. Outer wall;

[0039] 113. Chute;

[0040] 114. Upper shaft hole;

[0041] 115. Upper connecting groove;

[0042] 120. End wall;

[0043] 121. Adjustment hole;

[0044] 122. Locking hole;

[0045] 123. Locking pin;

[0046] 124. The first chamfer structure;

[0047] 200. Upper support plate;

[0048] 210. Upper slider;

[0049] 220. Upper support;

[0050] 230. Second chamfer structure;

[0051] 300. Lower support plate;

[0052] 310. Lower slider;

[0053] 320. Lower support;

[0054] 400. Screw;

[0055] 410. One-way thread;

[0056] 420.Screw head;

[0057] 421. Hexagonal structure;

[0058] 430.Through hole;

[0059] 500. Gear shaft;

[0060] 510. Gear;

[0061] 520. Push arm;

[0062] 530. Annular groove;

[0063] X. first horizontal direction;

[0064] Y. second horizontal direction;

[0065] Z. Vertical direction. DETAILED DESCRIPTION

[0066] Typical embodiments that embody the features and advantages of the present invention will be described in detail in the following description. It should be understood that the present invention can have various changes in different embodiments without departing from the scope of the present invention, and the descriptions and drawings therein are essentially for illustrative purposes rather than for limiting the present invention.

[0067] In the following description of different exemplary embodiments of the present invention, reference is made to the accompanying drawings, which form a part of the present invention and in which different exemplary structures, systems and steps that can implement multiple aspects of the present invention are shown by way of example. It should be understood that other specific schemes of components, structures, exemplary devices, systems and steps can be used, and structural and functional modifications can be made without departing from the scope of the present invention. Moreover, although the terms "above", "between", "within", etc. may be used in this specification to describe different exemplary features and elements of the present invention, these terms are used herein only for convenience, such as according to the direction of the examples described in the accompanying drawings. Nothing in this specification should be construed as requiring a specific three-dimensional orientation of the structure to fall within the scope of the present invention.

[0068] See also Figure 1 , which representatively shows a schematic diagram of the decomposition of the vertebral distraction device proposed in the present invention. In this exemplary embodiment, the vertebral distraction device proposed in the present invention is described by taking as an example a distraction device that is set in a vertebral body and distracts the main body to restore the original height. It is easy for those skilled in the art to understand that in order to apply the relevant design of the present invention to other types of distraction devices or other application scenarios, various modifications, additions, substitutions, deletions or other changes are made to the specific embodiments described below, and these changes are still within the scope of the principle of the vertebral distraction device proposed in the present invention.

[0069] like Figure 1 As shown, in this embodiment, the vertebral body distraction device proposed by the present invention can be implanted into the vertebral body through the minimally invasive channel established by the pedicle and distract the vertebral body. The vertebral body distraction device mainly includes a main body 100, two support plates and a distraction component. Figures 2 to 15 , Figure 2 A stereoscopic view of the main body 100 of the vertebral distraction device is representatively shown in FIG. Figure 3 A front view of the main body 100 of the vertebral distraction device is representatively shown; Figure 4 , a left side view of the main body 100 of the vertebral distraction device is representatively shown; Figure 5 A three-dimensional view of the upper support plate 200 of the vertebral distraction device is representatively shown in FIG. Figure 6 A front view of an upper support plate 200 of a vertebral distraction device is representatively shown; Figure 7 , which is a representative left view of the upper support plate 200 of the vertebral distraction device; Figure 8 A three-dimensional view of the lower support plate 300 of the vertebral distraction device is representatively shown in FIG. Fig. 9 A front view of the lower support plate 300 of the vertebral distraction device is representatively shown; Fig.10 A left view of the lower support plate 300 of the vertebral distraction device is representatively shown; Fig.11 A three-dimensional view of a screw 400 of a vertebral distraction device is representatively shown in FIG. Fig.12 A front view of a screw rod 400 of a vertebral distraction device is representatively shown in FIG. Fig.13 A front view of the gear shaft 500 of the vertebral distraction device is representatively shown; Fig.14 , which is a representative left view of the gear shaft 500 of the vertebral distraction device; Fig.15 The front view of the locking pin 123 of the vertebral body distraction device is representatively shown in FIG. The structure, connection mode and functional relationship of the main components of the vertebral body distraction device proposed by the present invention will be described in detail below in conjunction with the above drawings.

[0070] like Figures 1 to 14As shown, in this embodiment, the main body 100 has an inner cavity, and the top and bottom of the main body 100 are respectively provided with an upper opening and a lower opening, and the upper opening and the lower opening are respectively connected to the inner cavity. The main body 100 has two side walls 110 parallel to the second horizontal direction Y, and the outer surfaces of the two side walls 110 and the outer surfaces of the two support plates both include cylindrical arc surfaces or elliptical cylindrical arc surfaces. When the two support plates are not opened, the outer surfaces of the two side walls 110 and the outer surfaces of the two support plates jointly define a cylindrical surface or an elliptical cylindrical surface, and the corresponding axes of the cylindrical surface and the elliptical cylindrical surface extend along the first horizontal direction X perpendicular to the second horizontal direction Y. The two support plates are respectively arranged at the upper opening and the lower opening, and the support plates are slidably matched with the main body 100 and can be opened relative to the main body 100. Among them, for the convenience of understanding and explanation, the support plate arranged at the upper opening is defined as the upper support plate 200, and the support plate arranged at the lower opening is defined as the lower support plate 300. That is, the upper support plate 200 can move upward relative to the main body 100 starting from the upper opening, and the lower support plate 300 can move downward relative to the main body 100 starting from the lower opening. The expansion assembly mainly includes a screw 400 and two sets of gear shafts. The screw 400 is rotatably arranged in the inner cavity along the first horizontal direction X. The screw 400 is roughly tubular in structure and has a lumen, and one end of the screw 400 provided with a screw head 420 is open and the other end is closed, and a through hole 430 is provided on the screw 400, and the through hole 430 is connected to the lumen in the radial direction of the screw 400. Accordingly, the screw 400 can be injected into the vertebral body through its lumen and through hole for fillers such as bone cement, so as to adapt to the application environment in the vertebral body and meet the application requirements. The two sets of gear shafts are respectively located above and below the screw 400, and each set of gear shafts includes at least one gear shaft 500 (in this embodiment, each set of gear shafts includes two gear shafts 500 as an example for explanation). The gear shaft 500 is rotatably arranged in the inner cavity along the second horizontal direction Y, and the gear shaft 500 is provided with gears 510 and push arms 520 spaced apart along the second horizontal direction Y (i.e., the axial direction of the gear shaft 500). The gear 510 is meshed with the one-way thread 410 of the screw 400, and the push arm 520 extends radially along the gear shaft 500. Accordingly, when the two support plates of the vertebral body distraction device need to be distracted up and down, the screw 400 can be adjusted to rotate, and the screw 400 can be used to drive the upper and lower sets of gear shafts to rotate synchronously, and the push arms 520 of the two sets of gear shafts rotate with the gear shaft 500 to push the upper and lower support plates outward relative to the main body 100. Through the above design, the vertebral body distraction device proposed by the present invention has the advantages of simple structure and easy operation while realizing the synchronous distraction of the upper and lower support plates. Furthermore, since the expansion function is realized by adopting the matching design of the screw rod 400 and the gear shaft 500, the meshing characteristics of the screw rod 400 and the gear also enable the present invention to have a self-locking function, further optimizing the stability of the structure.Furthermore, the vertebral distraction device proposed in the present invention designs the main body 100 and the two support plates to be roughly cylindrical or elliptical when not distracted, so that the process of the vertebral distraction device entering the vertebral body through the pedicle minimally invasive channel is smoother and more suitable for the application environment inside the vertebral body.

[0071] Preferably, if Figures 1 to 10 As shown, in this embodiment, the main body 100 has two end walls 120 opposite to each other in the first horizontal direction, and each support plate also has two other end walls opposite to each other in the first horizontal direction, and the two end walls 120 and the other four end walls are all planar structures. Accordingly, when the two support plates are not spread apart, the main body 100 and the two support plates can jointly define a cylindrical structure or an elliptical cylindrical structure.

[0072] Furthermore, if Figures 2 to 4 As shown, based on the design that both end walls 120 of the main body 100 are planar structures, in this embodiment, the connection between the two end walls 120 of the main body 100 and the two side walls 110 may preferably be provided with a first chamfered structure 124. The first chamfered structure 124 may preferably be an inclined surface structure or a curved surface structure. Accordingly, the present invention can make the structure of the main body 100 more rounded through the design of the first chamfered structure 124, and further adapt to the application environment in the vertebral body.

[0073] Furthermore, if Figures 5 to 10 As shown, based on the design that both end walls of each support plate are planar structures, in this embodiment, the connection between the two end walls of the upper support plate 200 and its main structure can be preferably provided with a second chamfered structure 230, and the connection between the two end walls of the lower support plate 300 and its main structure can be preferably provided with a third chamfered structure 330. Among them, the second chamfered structure 230 and the third chamfered structure 330 can preferably adopt an inclined surface structure or a curved surface structure. Accordingly, the present invention can make the structures of the two support plates smoother through the design of the above chamfered structure, and further adapt to the application environment in the vertebral body.

[0074] Preferably, if Figures 2 to 4 As shown, in this embodiment, the side wall 110 of the main body 100 may preferably include an inner wall portion 111 and an outer wall portion 112. Specifically, the inner wall portion 111 is in contact with the outer wall portion 112, and the inner wall portion 111 is located on the relatively inner side of the outer wall portion 112. The inner wall portion 111 is generally a flat plate structure. The inner side surface of the outer wall portion 112 (i.e., the side surface in contact with the inner wall portion 111) is generally flat, and the outer side surface of the outer wall portion 112 is the outer surface of the side wall 110 and includes a cylindrical arc surface or an elliptical cylindrical arc surface. Among them, the inner wall portion 111 and the outer wall portion 112 of the side wall 110 can be connected in a fixed manner or in an integrally formed manner.

[0075] Furthermore, if Figures 1 to 4 As shown, based on the design that the side wall 110 includes an inner wall portion 111 and an outer wall portion 112, in this embodiment, the width of the outer wall portion 112 in the vertical direction Z can be preferably designed to be slightly larger than the width of the inner wall portion 111 in the vertical direction Z, that is, the top edge and the bottom edge of the outer wall portion 112 exceed the top edge and the bottom edge of the inner wall portion 111 upward and downward respectively. Accordingly, the main body 100 can form a groove structure at its upper opening and lower opening respectively, and when the two support plates are not opened, the two support plates are partially accommodated in the two groove structures respectively. Specifically, the two side edges of the upper support plate 200 in the second horizontal direction are respectively located above the top edges of the two inner wall portions 111, and are respectively located within the top edges of the two outer wall portions 112. The two side edges of the lower support plate 300 in the second horizontal direction are respectively located below the bottom edges of the two inner wall portions 111, and are respectively located within the bottom edges of the two outer wall portions 112.

[0076] Preferably, if Fig.13 and Fig.14 As shown, in this embodiment, a plurality of through holes 430 may be preferably provided on the screw 400. Among them, these through holes 430 are arranged on the screw 400 at intervals roughly along the first horizontal direction. In addition, these through holes 430 are arranged at intervals roughly along the circumference of the screw 400. Through the above design, the present invention can optimize the injection effect of bone cement by using the design of opening a plurality of through holes 430 on the screw 400. In addition, the design of the plurality of through holes 430 arranged at intervals on the screw 400 can keep the one-way thread 410 of the screw 400 engaged with the gear 510 of the gear shaft 500.

[0077] Preferably, if Figure 1 , Fig.13 and Fig.14 As shown, in this embodiment, a one-way thread 410 is provided on the rod body of the screw rod 400, a screw head 420 is provided at one end of the screw rod 400, and the end surface of the screw head 420 can preferably be provided with an inner hexagonal structure 421. Accordingly, when it is necessary to prop open the two support plates, an outer hexagonal wrench or other tools can be used to cooperate with the inner hexagonal structure 421 of the screw head 420, so as to achieve the rotation adjustment of the screw rod 400. In other embodiments, the end surface of the screw head 420 can also be provided with other structures that are convenient for screwing, such as an outer hexagonal structure, an inner triangular structure, etc., which are not limited to this embodiment.

[0078] Preferably, if Figures 1 to 4As shown, in this embodiment, adjustment holes are respectively provided on the two end walls 120 of the main body 100. The two ends of the screw rod 400 are rotatably disposed in the two adjustment holes, and the screw head 420 of the screw rod 400 can preferably be exposed outside the main body 100, that is, the screw head 420 is exposed outside the end wall through the adjustment hole of one of the two end walls 120.

[0079] Furthermore, if Figures 1 to 4 As shown, based on the design that the screw head 420 of the screw rod 400 is exposed on an end wall 120, in this embodiment, the end wall 120 where the screw head 420 is exposed can preferably be provided with a locking hole 122 along the vertical direction Z. Among them, one end opening of the locking hole 122 is located at the top or bottom of the end wall 120, and the other end opening of the locking hole 122 is connected to the adjustment hole opened on the end wall 120. On this basis, the vertebral body distraction device can also preferably include a locking pin 123, which is detachably arranged in the locking hole 122 to lock the screw rod 400 in the horizontal direction to prevent the screw rod 400 from moving in the horizontal direction.

[0080] Preferably, if Figures 1 to 3 As shown, in this embodiment, the main body 100 is respectively provided with a pair of shaft holes corresponding to each gear shaft 500, and the two shaft holes in the same pair are respectively arranged on the two side walls 110 opposite to each other, and the shaft holes in this embodiment are only arranged on the inner wall portion 111 of the side wall 110, and of course, they can also be arranged on the inner wall portion 111 and the outer wall portion 112 at the same time (for example, through the entire side wall 110). The two ends of the gear shaft 500 are respectively rotatably arranged in the two shaft holes in the same pair. Among them, based on the design that each group of gear shafts in this embodiment includes two gear shafts 500 arranged at intervals along the first horizontal direction X, the main body 100 is correspondingly provided with four pairs of shaft holes. Specifically, the four pairs of shaft holes include two pairs of upper shaft holes 114 and two pairs of lower shaft holes.

[0081] Furthermore, if Figures 1 to 3As shown, based on the design of the upper shaft hole 114, in this embodiment, two pairs of upper shaft holes 114 are arranged at intervals in the first horizontal direction X, and the two pairs of upper shaft holes 114 are respectively provided for the two gear shafts 500 located above the screw rod 400 to rotate. The two upper shaft holes 114 of the same pair are respectively arranged on the two side walls 110. On this basis, the side wall 110 (for example, the inner wall portion 111) can preferably open an upper connecting groove 115 from the top edge downward, and the lower end of the upper connecting groove 115 is connected to the upper shaft hole 114, so that the upper shaft hole 114 presents an incomplete hole shape, similar to a hole groove structure. The remaining hole shape of the upper shaft hole 114 can preferably be a superior arc shape, that is, the width of the position where the upper connecting groove 115 is connected to the upper shaft hole 114 is less than the maximum width (or aperture) of the upper shaft hole 114, thereby enabling the end of the gear shaft 500 to be inserted into the upper shaft hole 114 and positioning of the gear shaft 500 can be achieved. In addition, the upper connecting groove 115 can preferably be an inverted trapezoidal groove type, that is, the width of the groove of the upper connecting groove 115 located at the top edge of the side wall 110 is greater than the width of the position connected to the upper shaft hole 114, thereby facilitating the operation during the insertion of the gear shaft 500 and providing a guiding function. In other embodiments, the upper shaft hole 114 can also be a complete hole type and opened on the side wall 110, which is not limited to this embodiment.

[0082] Similarly, in this embodiment, two pairs of lower shaft holes are arranged at intervals in the first horizontal direction X, and the two pairs of lower shaft holes are respectively provided for the two gear shafts 500 located below the screw rod 400 to rotate. The two lower shaft holes of the same pair are respectively arranged on the two side walls 110. On this basis, the side wall 110 (for example, the inner wall portion 111) can preferably open a lower connecting groove from the bottom edge upward, and the upper end of the lower connecting groove is connected to the lower shaft hole, so that the lower shaft hole presents an incomplete hole shape, similar to a hole groove structure. The remaining hole shape of the lower shaft hole can be preferably a superior arc shape, that is, the width of the position where the lower connecting groove is connected to the lower shaft hole is less than the maximum width (or aperture) of the lower shaft hole, thereby enabling the end of the gear shaft 500 to be inserted into the lower shaft hole and positioning of the gear shaft 500 can be achieved. In addition, the lower connecting groove can be preferably a trapezoidal groove shape, that is, the width of the notch of the lower connecting groove located at the bottom edge of the side wall 110 is greater than the width of the position connected to the lower shaft hole, thereby facilitating operation during the insertion of the gear shaft 500 and providing a guiding function. In other embodiments, the lower shaft hole may also be a complete hole and opened on the side wall 110 , which is not limited to this embodiment.

[0083] Furthermore, based on the shaft hole design provided on the side wall 110, in this embodiment, retaining rings can be preferably provided at both ends of the gear shaft 500 to limit the gear shaft 500 between the two shaft holes in the second horizontal direction Y to prevent the gear shaft 500 from moving in the second horizontal direction Y.

[0084] Furthermore, based on the design of the retaining ring, in the present embodiment, the retaining ring may preferably adopt a “C”-shaped structure.

[0085] Furthermore, if Fig.11 As shown, based on the design of the retaining ring, in this embodiment, two annular grooves 530 may be preferably provided near the two ends of the gear shaft 500 for installing the two retaining rings at the two ends of the gear shaft 500. Accordingly, when the two ends of the gear shaft 500 are respectively and selectively provided in the two shaft holes (the upper shaft hole 114 or the lower shaft hole), the inner ring of the retaining ring is clamped in the annular groove 530, and the side surface of the retaining ring abuts against the side wall 110, thereby realizing the position limitation of the gear shaft 500.

[0086] Preferably, if Figure 1 , Figures 5 to 7 As shown, in this embodiment, the surface (i.e., the lower surface) of the upper support plate 200 facing the main body 100 may preferably be provided with an upper slider 210. Accordingly, the main body 100 may preferably be provided with a slide groove 113, and the slide groove 113 extends along the vertical direction Z. Accordingly, the upper slider 210 is slidably matched with the slide groove 113, so that the upper support plate 200 can be slidably arranged in the upper opening of the main body 100.

[0087] Furthermore, if Figure 1 , Figures 5 to 7 As shown, based on the design that the upper support plate 200 is provided with an upper slider 210 and the main body 100 is provided with a slide groove 113, in this embodiment, the support plate can be further preferably provided with two pairs of upper sliders 210. Among them, the two pairs of upper sliders 210 are arranged at intervals along the first horizontal direction X, and the two upper sliders 210 of the same pair are arranged at intervals along the second horizontal direction Y. Correspondingly, the main body 100 can be further preferably provided with two pairs of slide grooves 113. Among them, the two pairs of slide grooves 113 are arranged at intervals along the first horizontal direction X, and the two slide grooves 113 of the same pair are arranged at intervals along the second horizontal direction Y. Accordingly, the two pairs of upper sliders 210 correspond to the two pairs of slide grooves 113 respectively, and the two upper sliders 210 of the same pair correspond to the two slide grooves 113 of the same pair respectively, that is, the four sliders are slidably matched with the four slide grooves 113 in a one-to-one correspondence. In other embodiments, the number of upper sliders 210 can also be one, two, three, or more than four, and the number of slide grooves 113 can also be one, two, three, or more than four. When there are multiple upper sliders 210, the multiple upper sliders 210 can also be distributed in other forms, and when there are multiple slide grooves 113, other distribution forms can also be adopted. The number of upper sliders 210 is not limited to being equal to the number of slide grooves 113, and the upper sliders 210 are not limited to a one-to-one correspondence with the slide grooves 113. For example, a design in which two or more of the multiple upper sliders 210 are simultaneously slidably matched with one slide groove 113 can be adopted, which is not limited to this embodiment.

[0088] Preferably, if Figure 1 , Figures 8 to 10 As shown, in this embodiment, the surface (i.e., the upper surface) of the lower support plate 300 facing the main body 100 may preferably be provided with a lower slider 310. Accordingly, the main body 100 may preferably be provided with a slide groove 113, and the slide groove 113 extends along the vertical direction Z. Accordingly, the lower slider 310 is slidably matched with the slide groove 113, so that the lower support plate 300 can be slidably arranged at the lower opening of the main body 100.

[0089] Furthermore, if Figure 1 , Figure 2 and Figure 8 As shown, based on the design that the lower support plate 300 is provided with a lower slider 310 and the main body 100 is provided with a slide groove 113, in this embodiment, the support plate can be further preferably provided with two pairs of lower sliders 310. Among them, the two pairs of lower sliders 310 are arranged at intervals along the first horizontal direction X, and the two lower sliders 310 of the same pair are arranged at intervals along the second horizontal direction Y. Correspondingly, the main body 100 can be further preferably provided with two pairs of slide grooves 113. Among them, the two pairs of slide grooves 113 are arranged at intervals along the first horizontal direction X, and the two slide grooves 113 of the same pair are arranged at intervals along the second horizontal direction Y. Accordingly, the two pairs of lower sliders 310 correspond to the two pairs of slide grooves 113 respectively, and the two lower sliders 310 of the same pair correspond to the two slide grooves 113 of the same pair respectively, that is, the four sliders are slidably matched with the four slide grooves 113 in a one-to-one correspondence. In other embodiments, the number of lower sliders 310 can also be one, two, three, or more than four, and the number of slide grooves 113 can also be one, two, three, or more than four. When there are multiple lower sliders 310, the multiple lower sliders 310 can also be distributed in other forms, and when there are multiple slide grooves 113, other distribution forms can also be adopted. The number of lower sliders 310 is not limited to being equal to the number of slide grooves 113, and the lower sliders 310 are not limited to a one-to-one correspondence with the slide grooves 113. For example, a design in which more than two of the multiple lower sliders 310 are simultaneously slidably matched with one slide groove 113 can be adopted, which is not limited to this embodiment.

[0090] Furthermore, if Figure 1 , Figures 5 to 10As shown, based on the above-mentioned design of the upper slider 210, the lower slider 310 and the slide groove 113, in this embodiment, the number of the upper sliders 210 provided on the upper support plate 200 and the number of the lower sliders 310 provided on the lower support plate 300 are both four, that is, the number of the upper sliders 210 and the number of the lower sliders 310 can be preferably equal. Furthermore, when the number of the upper sliders 210 and the number of the lower sliders 310 are equal, the arrangement of the two can be further preferably the same, that is, a plurality of upper sliders 210 correspond to a plurality of lower sliders 310 one by one, that is, each upper slider 210 corresponds to a lower slider 310 located below it in the vertical direction Z. On this basis, each pair of upper sliders 210 and lower sliders 310 corresponding to each other can further preferably share a slide groove 113, that is, each slide groove 113 is slidably matched with an upper slider 210 and a lower slider 310, and the upper slider 210 is located above the lower slider 310. Specifically, taking the example of the four upper sliders 210 and the four lower sliders 310 in the present embodiment, the main body 100 may be provided with four corresponding slide grooves 113, and the four slide grooves 113 are divided into two pairs, the two pairs of slide grooves 113 are arranged at intervals along the first horizontal direction X, and the two slide grooves 113 in the same pair are arranged at intervals along the second horizontal direction Y. In other embodiments, when the upper slider 210 and the lower slider 310 correspond one to one, they may also be slidably matched with independent slide grooves 113 respectively, and the slide grooves 113 matched with the upper slider 210 and the corresponding slide grooves 113 matched with the lower slider 310 are arranged on the main body 100 at intervals in the vertical direction Z. Furthermore, when the upper slider 210 and the lower slider 310 do not adopt a one-to-one corresponding design, the slide grooves 113 matched with the upper slider 210 and the lower slider 310 may also be staggered in the horizontal direction, which is not limited to the present embodiment.

[0091] Furthermore, if Figures 1 to 4 As shown, based on the design that the main body 100 is provided with a slide groove 113, in this embodiment, the slide groove 113 can be preferably provided on at least one of the two side walls 110, and the slide groove 113 in this embodiment runs through the inner wall portion 111 and the outer wall portion 112 of the side wall 110. In other embodiments, the slide groove 113 can also be provided only on the inner wall portion 111 of the side wall 110, and is not limited to this embodiment.

[0092] Furthermore, if Figures 1 to 4 As shown, based on the design that the slide groove 113 is arranged on the side wall 110 and based on the design that two pairs of slide grooves 113 are arranged on the main body 100, in this embodiment, the two slide grooves 113 of the same pair can be respectively arranged on the two side walls 110, that is, each slide groove 113 belonging to the two pairs is arranged at intervals along the first horizontal direction X on one side wall 110, and each other slide groove 113 belonging to the two pairs is arranged at intervals along the first horizontal direction X on the other side wall 110.

[0093] Preferably, if Figure 1 , Figures 5 to 7 As shown, in this embodiment, the surface (i.e., the lower surface) of the upper support plate 200 facing the main body 100 may preferably be provided with an upper support 220 protruding toward the main body 100. Specifically, the number of the upper supports 220 may preferably be the same as the number of the upper sliders 210, i.e., each upper slider 210 is disposed on the lower surface of the upper support plate 200 through the upper supports 220.

[0094] Preferably, if Figure 1 , Figures 8 to 10 As shown, in this embodiment, the surface (i.e., the upper surface) of the lower support plate 300 facing the main body 100 may preferably be provided with a lower support 320 protruding toward the main body 100. Specifically, the number of the lower support 320 may preferably be the same as the number of the lower sliders 310, i.e., each lower slider 310 is disposed on the upper surface of the lower support plate 300 through the lower support 320.

[0095] Preferably, if Figure 1 As shown, in this embodiment, each group of gear shafts may preferably include two gear shafts 500, and the two gear shafts 500 in the same group are spaced apart along the first horizontal direction X. In other embodiments, the number of gear shafts 500 included in each group of gear shafts may also be one, three, or more than four, and when a group of gear shafts includes multiple gear shafts 500, the gear shafts 500 in the same group are spaced apart along the first horizontal direction X. In addition, the number of gear shafts 500 included in each of the upper and lower groups of gear shafts may preferably be the same, but may also be different.

[0096] Furthermore, if Figure 1 As shown, in this embodiment, based on the design that each group of gear shafts includes two gear shafts 500, in this embodiment, the gear shafts 500 included in each of the upper and lower groups of gear shafts can be preferably arranged in a one-to-one correspondence. That is, any gear shaft 500 located above the screw 400 is arranged vertically opposite to a gear shaft 500 located below the screw 400 in the vertical direction Z. In other embodiments, regardless of whether the number of gear shafts in the two groups is the same, the two groups of gear shafts can also be arranged in a staggered manner, which is not limited to this embodiment.

[0097] Preferably, if Figure 1 , Fig.11 and Fig.12As shown, in this embodiment, two pushing arms 520 may be preferably provided on each gear shaft 500. Among them, the two pushing arms 520 may be preferably located on both sides of the gear 510 in the first horizontal direction X. Accordingly, by providing multiple pushing arms 520 on each gear shaft 500, the stability of the support plate expansion can be further optimized, and the operator can be more labor-saving. In other embodiments, only one pushing arm 520 may be provided on each gear shaft 500, or more than two pushing arms 520 may be provided, and when multiple pushing arms 520 are provided on the gear shaft 500, a part of these pushing arms 520 may be preferably provided on one side of the gear 510 along the second horizontal direction Y, and the remaining pushing arms 520 may be provided on the other side of the gear 510. In addition, the number of pushing arms 520 provided on each gear shaft 500 is not limited to the same, and the arrangement form is not limited to the same, and both are not limited to this embodiment.

[0098] It should be noted that if Figures 1 to 10 As shown, in this embodiment, the structures of the upper support plate 200 and the lower support plate 300 are substantially the same, and it can also be understood that the upper support plate 200 and the lower support plate 300 are mirror-imaged relative to a reference plane, and the reference plane is the middle horizontal plane of the main body 100. Further, based on the design that the upper support plate 200 and the lower support plate 300 have substantially the same structure, the main body 100 can also be a mirror-symmetric structure, and the upper and lower parts of the main body 100 that are mirror images of each other are also relative to the above-mentioned reference plane. In other embodiments, the upper support plate 200 and the lower support plate 300 may also be different, for example, the two have different shapes, thicknesses, sizes, etc., and the structure of the main body 100 can also be adjusted accordingly according to the structural differences between the upper support plate 200 and the lower support plate 300, and is not limited to this embodiment.

[0099] It should be noted that the vertebral distraction devices shown in the drawings and described in this specification are only a few examples of the many types of vertebral distraction devices that can employ the principles of the present invention. It should be clearly understood that the principles of the present invention are in no way limited to any details of the vertebral distraction devices shown in the drawings or described in this specification or any components of the vertebral distraction devices.

[0100] In summary, the vertebral distraction device proposed in the present invention has the advantages of simple structure and easy operation while realizing the synchronous distraction of the upper and lower support plates. Moreover, since the distraction function is realized by adopting the coordinated design of the screw and the gear shaft, the meshing characteristics of the screw and the gear also enable the present invention to have a self-locking function, further optimizing the stability of the structure. Furthermore, the vertebral distraction device proposed in the present invention designs the main body and the two support plates to be roughly cylindrical or elliptical when not distracted, so that the process of the vertebral distraction device entering the vertebral body through the pedicle minimally invasive channel is smoother and more suitable for the application environment inside the vertebral body. In addition, by arranging a lumen and a through hole in the screw, the present invention can inject fillers such as bone cement into the vertebral body through the lumen and the through hole, further meeting the application needs inside the vertebral body.

[0101] The exemplary embodiments of the vertebral distraction device proposed by the present invention are described and / or illustrated in detail above. However, the embodiments of the present invention are not limited to the specific embodiments described herein. On the contrary, the components and / or steps of each embodiment can be used independently and separately from other components and / or steps described herein. Each component and / or each step of an embodiment can also be used in combination with other components and / or steps of other embodiments. When introducing the elements / components / etc. described and / or illustrated herein, the terms "one", "an" and "above" are used to indicate the presence of one or more elements / components / etc. The terms "comprising", "including" and "having" are used to indicate an open-ended inclusion and mean that in addition to the listed elements / components / etc., there may be other elements / components / etc. In addition, the terms "first" and "second" in the claims and the specification are used only as markers and are not numerical limitations on their objects.

[0102] While the vertebral distraction device of the present invention has been described in terms of various specific embodiments, those skilled in the art will recognize that the invention can be practiced with modification within the spirit and scope of the claims.

Claims

1. A vertebral body distraction device, used to be arranged in a vertebral body and distract the vertebral body, characterized in that The vertebral body distraction device comprises: A main body having an inner cavity and an upper opening and a lower opening respectively connected to the inner cavity; Two support plates are respectively arranged at the upper opening and the lower opening, and the support plates are slidably matched with the main body so as to be able to be opened relative to the main body; as well as Spreading components, including: A screw rod is rotatably disposed in the inner cavity along a first horizontal direction, the screw rod is in a tubular structure and has a tubular cavity, one end of the screw rod having a screw head is open and the other end is closed, and the screw rod has a through hole; and Two groups of gear shafts are respectively located above and below the screw rod, each group of gear shafts includes at least one gear shaft, the gear shaft is rotatably arranged in the inner cavity along a second horizontal direction perpendicular to the first horizontal direction, the gear shaft is provided with gears and push arms spaced apart along the second horizontal direction, the gears are meshed with the screw rod, and the push arms extend radially along the gear shaft; Wherein, the vertebral body distraction device is configured to be able to drive the two sets of gear shafts to rotate synchronously through the rotation of the screw, and the pushing arms of the two sets of gear shafts push the two support plates to be distracted outward relative to the main body respectively; Wherein, the main body has two side walls parallel to each other in the second horizontal direction, the outer surfaces of the two side walls and the outer surfaces of the two support plates both include cylindrical arc surfaces or elliptical cylindrical arc surfaces, and when the two support plates are not opened, the outer surfaces of the two side walls and the outer surfaces of the two support plates jointly define a cylindrical surface or an elliptical cylindrical surface, and the corresponding axes of the cylindrical surface and the elliptical cylindrical surface extend along the first horizontal direction; The screw rod is provided with a plurality of through holes; wherein the plurality of through holes are arranged at intervals along a first horizontal direction, and / or the plurality of through holes are arranged at intervals along a circumferential direction of the screw rod; The main body has two end walls opposite to each other in a first horizontal direction, and the two end walls are respectively provided with adjustment holes. The two ends of the screw rod are respectively rotatably arranged in the two adjustment holes, and the screw head is exposed to the outside of one of the end walls through one of the adjustment holes.

2. The vertebral distraction device according to claim 1, characterized in that The main body has two end walls opposite to each other in a first horizontal direction, and the support plate has two end walls opposite to each other in the first horizontal direction. When the two support plates are not opened, the main body and the two support plates jointly define a cylindrical structure or an elliptical cylindrical structure.

3. The vertebral distraction device according to claim 1, characterized in that , the end wall where the screw head is exposed is provided with a locking hole in the vertical direction, one end opening of the locking hole is located at the top or bottom of the end wall, and the other end opening is connected to the adjustment hole opened in the end wall; wherein the vertebral distraction device also includes a locking pin, which is detachably arranged in the locking hole to lock the screw in the horizontal direction.

4. The vertebral distraction device according to claim 1, characterized in that A sliding block is provided on the surface of the support plate facing the main body, and the main body is provided with a sliding groove, the sliding groove extends in a vertical direction, and the sliding block is slidably matched with the sliding groove.

5. The vertebral distraction device according to claim 4, characterized in that The support plate is provided with a plurality of pairs of sliders, the plurality of pairs of sliders are arranged at intervals along a first horizontal direction, and the two sliders in the same pair are arranged at intervals along a second horizontal direction; the main body is provided with a plurality of pairs of slide grooves, the plurality of pairs of slide grooves are arranged at intervals along a first horizontal direction, and the two slide grooves in the same pair are arranged at intervals along a second horizontal direction; wherein the plurality of sliders are slidably matched with the plurality of slide grooves in a one-to-one correspondence.

6. The vertebral distraction device according to claim 5, characterized in that The number of the sliders arranged on the two support plates is equal and corresponds one to one; wherein the two support plates share a plurality of the slide grooves, and each of the slide grooves simultaneously slides with two corresponding sliders belonging to the two support plates.

7. The vertebral distraction device according to claim 1, characterized in that Each group of the gear shafts includes a plurality of the gear shafts, and the plurality of gear shafts are spaced apart and distributed along a first horizontal direction.

8. The vertebral distraction device according to claim 1, characterized in that Each of the gear shafts is provided with a plurality of pushing arms, a portion of the plurality of pushing arms being located on one side of the gear in the first horizontal direction, and another portion of the plurality of pushing arms being located on the other side of the gear in the first horizontal direction.

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