Pedicle screw for spinal surgery

Abstract

The pedicle screw comprises a screw body and a screw base, the screw base is connected to the upper end of the screw body, the screw body is provided with a fixing assembly used for reinforcing fixation, a mounting groove with the upper end penetrating through the screw base is formed in the screw body, and a plurality of screw holes communicated with the outside are formed in the peripheral side of the mounting groove; the fixing assembly comprises a plurality of fixing nails and connectors, the fixing nails are inserted into the screw holes one by one, the fixing nails are in threaded connection with the screw holes, the connectors are connected to the ends, located in the mounting groove, of the fixing nails, a rotating mechanism is inserted into the mounting groove, and the rotating mechanism drives the connectors to rotate. And the fixing nail is inserted into the vertebral pedicle. After the screw is fixed on the vertebral pedicle, the connector is driven by the rotating mechanism to rotate, and the fixing nail is inserted into the vertebral pedicle, so that the fixation of the screw is further enhanced, the screw is not easy to loosen or slip, and the correction effect of the spine is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and particularly relates to a pedicle screw for spinal surgery. Background Art

[0002] Pedicle screws are commonly used internal fixation devices in spinal surgery, mainly used to treat diseases such as scoliosis, spondylolisthesis, spinal instability, and spinal fractures. By implanting the screws into the pedicle part of the spine, strong fixation force can be provided to help stabilize the spinal structure, promote bone fusion, and thus achieve the treatment purpose, and it has been widely used clinically. However, for patients with osteoporosis, due to the low bone density, the fixation strength of traditional screws in the loose bone significantly decreases, and they are prone to loosening or slipping, affecting the correction effect, being unfavorable for the later rehabilitation, and in severe cases, reoperation is required. Summary of the Invention

[0003] The purpose of the present invention is to provide a pedicle screw for spinal surgery. After the screw is fixed on the pedicle, the rotation mechanism drives each fixing nail to rotate, and the fixing nail is inserted into the pedicle to strengthen the fixation of the screw.

[0004] The above technical purpose of the present invention is achieved through the following technical solutions:

[0005] A pedicle screw for spinal surgery includes a screw and a nail seat. The nail seat is connected to the upper end of the screw. The screw is provided with a fixing component for strengthening fixation. An installation groove is opened in the screw and penetrates through the nail seat at the upper end. A plurality of screw holes communicating with the outside are opened on the circumferential side of the installation groove. The outer end of the screw hole is obliquely downward. The fixing component includes fixing nails and a connecting head. There are multiple fixing nails and each is inserted into the screw hole. The fixing nail is threadedly connected to the screw hole. The connecting head is connected to one end of the fixing nail located in the installation groove. A rotation mechanism is inserted into the installation groove, and the rotation mechanism drives each connecting head to rotate to insert the fixing nail into the pedicle.

[0006] By adopting the above technical solution, after the screw is fixed on the pedicle, the rotation mechanism drives the connecting head to rotate, and the fixing nail is inserted into the pedicle, further strengthening the fixation of the screw, being not prone to loosening or slipping, and ensuring the spinal correction effect.

[0007] The further setting of the present invention is that the angle between the screw hole and the horizontal plane is 0 - 60°.

[0008] By adopting the above technical solution, the fixation effect of the fixing nail can be enhanced. The more prominent the fixing nail is from the screw, the stronger the fixation effect.

[0009] A further setting of the present invention is that the connecting head is a first bevel gear, the diameter of the first bevel gear near one end of the fixing nail is larger than that of the other end, the rotating mechanism includes a handle, a connecting rod, a slider, a plurality of connecting blocks and a plurality of second bevel gears. The lower end of the handle is connected to the connecting rod, the lower end of the connecting rod is connected to the slider, the slider is slidably matched with the installation groove, the lower end of the slider is connected to the plurality of second bevel gears, the diameters of the second bevel gears gradually decrease from top to bottom, and adjacent two second bevel gears are connected by the connecting block. The second bevel gears can all be meshed with the first bevel gear. When the tip of the fixing nail shrinks into the screw hole, the second bevel gear at the lowermost end is meshed with the first bevel gear. When the fixing nail completely extends out of the screw hole, the second bevel gear at the uppermost end is meshed with the first bevel gear.

[0010] By adopting the above technical solution, hold the handle and rotate the slider, and the plurality of second bevel gears under the slider rotate the first bevel gear from top to bottom in sequence to push the fixing nail to move outwards and insert it into the pedicle for further fixation. Of course, as the fixing nail moves outwards, the first bevel gear also gradually moves outwards. When the second bevel gear below cannot drive the first bevel gear to move, it is necessary to use the second bevel gear above to be meshed with the first bevel gear.

[0011] A further setting of the present invention is that a storage groove with a diameter smaller than that of the installation groove is opened at the bottom of the installation groove, and the storage groove is used for the downward movement of the second bevel gear.

[0012] A further setting of the present invention is that an internal hexagonal groove is opened at the open end of the installation groove.

[0013] By adopting the above technical solution, it is convenient to rotate the screw.

[0014] A further setting of the present invention is that a through hole penetrating the screw is opened at the bottom of the installation groove.

[0015] By adopting the above technical solution, it is convenient to pass the guide wire, which is beneficial to the performance of minimally invasive surgery.

[0016] A further setting of the present invention is that the screw is provided with a first thread and a second thread. The first thread is arranged below the fixing component, and the second thread is arranged above the fixing component.

[0017] By adopting the above technical solution, it is convenient to set the first thread and the second thread with different pitches to ensure the stability of the screw.

[0018] To sum up, the present invention has the following beneficial effects:

[0019] First, after the screw in the present invention is fixed on the pedicle, the connecting head is driven to rotate by the rotating mechanism, and the fixing nail is inserted into the pedicle, further strengthening the fixation of the screw, making it not easy to loosen or slip off, and ensuring the correction effect of the spine.

[0020] Second, the fixing nail in the present invention drives the first bevel gear to rotate through a plurality of second bevel gears that gradually decrease from top to bottom, thereby rotating the fixing nail. The fixing nail rotates and moves outwards, and is inserted into the pedicle. Of course, it can also be rotated in the reverse direction by the rotating mechanism to screw out the fixing nail, which is convenient for removing the screw after the correction is completed. Brief Description of the Drawings

[0021] Figure 1 is a sectional view of the present invention (the fixing nail does not protrude);

[0022] Figure 2 is the present invention Figure 1 an enlarged view of part A in;

[0023] Figure 3 is a sectional view of the present invention (the fixing nail protrudes);

[0024] Figure 4 is the present invention Figure 3 an enlarged view of part B in.

[0025] In the figure: 1, screw; 11, installation groove; 12, screw hole; 13, storage groove; 14, hexagon socket recess; 15, through hole; 16, first thread; 17, second thread; 2, nail seat; 3, fixing component; 31, fixing nail; 32, connecting head; 4, rotating mechanism; 41, handle; 42, connecting rod; 43, slider; 44, connecting block; 45, second bevel gear. Detailed Description of the Preferred Embodiments

[0026] The following further describes the present invention in detail with reference to the accompanying drawings.

[0027] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "front", "rear", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0028] In addition, terms such as "horizontal" and "vertical" do not mean that the components are required to be absolutely horizontal or hanging, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0029] In the description of the present invention, it should also be noted that unless otherwise clearly specified and defined, the terms "arranged", "connected", and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, a direct connection, or an indirect connection through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] Embodiment, a pedicle screw for spinal surgery, as Figures 1 to 4 shown, includes a screw 1 and a nail seat 2. The nail seat 2 is connected to the upper end of the screw 1. The nail seat 2 is a prior art, so it will not be described in detail and can be selected according to needs. The difference between the screw 1 and the prior art is that: the screw 1 is provided with a fixing component 3 for strengthening the fixation. An installation groove 11 is formed in the screw 1 and penetrates through the nail seat 2 at the upper end. A plurality of screw holes 12 communicating with the outside are formed on the circumferential side of the installation groove 11. The outer ends of the screw holes 12 are inclined downward. The fixing component 3 includes fixing nails 31 and a connecting head 32. A plurality of fixing nails 31 are provided and are inserted into the screw holes 12 one by one. The fixing nails 31 are threadedly connected to the screw holes 12. The connecting head 32 is connected to one end of the fixing nail 31 located in the installation groove 11. A rotating mechanism 4 is inserted into the installation groove 11. The rotating mechanism 4 drives each connecting head 32 to rotate, and the fixing nails 31 will move outward, and the fixing nails 31 are inserted into the pedicle to strengthen the fixation of the screw 1.

[0031] The angle between the screw hole 12 and the horizontal plane is 0 - 60°. In this embodiment, the angle between the screw hole 12 and the horizontal plane is 60°. Of course, it can be 0° or 30°, or other angles between 0 - 60°. Different angles result in different lengths of the fixing nails 31 extending out. The longer the length, the better the fixing effect.

[0032] The connector 32 in this embodiment is a first bevel gear. The diameter of the first bevel gear near one end of the fixing nail 31 is larger than that of the other end. The rotating mechanism 4 includes a handle 41, a connecting rod 42, a slider 43, a plurality of connecting blocks 44 and a plurality of second bevel gears 45. The lower end of the handle 41 is connected to the connecting rod 42. The lower end of the connecting rod 42 is connected to the slider 43. The slider 43 is slidably matched with the installation groove 11. The lower end of the slider 43 is connected to a plurality of second bevel gears 45. The diameters of the second bevel gears 45 gradually decrease from top to bottom. Adjacent two second bevel gears 45 are connected by a connecting block 44. Each second bevel gear 45 can be meshed with the first bevel gear. When the tip of the fixing nail 31 retracts into the screw hole 12, the lowermost second bevel gear 45 is meshed with the first bevel gear. When the fixing nail 31 completely extends out of the screw hole 12, the uppermost second bevel gear 45 is meshed with the first bevel gear. Due to the different angles of the fixing nail 31 with respect to the horizontal plane, the meshing positions of the first bevel gear and the second bevel gears 45 are also different. If the angle between the screw hole 12 and the horizontal plane is small, the second bevel gear 45 and the upper end of the first bevel gear are meshed. When the angle between the screw hole 12 and the horizontal plane is large, the second bevel gear 45 and the lower end of the first bevel gear are meshed. Since the fixing nail 31 will move outwards during rotation, the first bevel gear will also move outwards, and the distance between the bevel gears will become larger. At this time, a larger second bevel gear 45 is needed for driving. Of course, when the rotating mechanism 4 rotates in the reverse direction, the fixing nail 31 can also be rotated into the installation groove 11, which is convenient for removing the screw 1 from the pedicle.

[0033] A storage groove 13 with a diameter smaller than that of the installation groove 11 is opened at the bottom of the installation groove 11. During the process of the second bevel gear 45 driving the first bevel gear to rotate, the lower second bevel gear 45 will move downwards. In order to ensure the fixation of the fixing nail 31, the screw hole 12 is opened at the bottom of the installation groove 11. Therefore, the storage groove 13 is needed for the downward movement of the second bevel gear 45.

[0034] An internal hexagonal groove 14 is opened at the open end of the installation groove 11, which is convenient for using an internal hexagonal wrench to rotate the screw rod.

[0035] A through hole 15 for passing through the screw 1 is opened at the bottom of the installation groove 11, and a guide wire can pass through it, which is convenient for performing minimally invasive surgery.

[0036] The screw 1 is provided with a first thread 16 and a second thread 17. The first thread 16 is arranged below the fixing component 3, and the second thread 17 is arranged above the fixing component 3. The first thread 16 and the second thread 17 can be set with different pitches to facilitate strengthening the fixation of the screw 1.

[0037] Usage method: First, insert the screw 1 into the pedicle, then insert the rotating mechanism 4 into the installation groove 11 to drive the fixing screw 31 to rotate. The second bevel gear 45 rotates the first bevel gear in the order from bottom to top, inserts the fixing screw 31 into the pedicle, and further fixes the screw 1. Of course, if the screw 1 is not to be removed, bone cement can be used to fill the installation groove 11, which is beneficial to the later recovery. If the screw 1 needs to be removed later, the bone cement is not filled, and the fixing screw 31 can be retracted into the installation groove 11 by rotating the rotating mechanism 4 in the reverse direction, and then the screw 1 can be removed.

[0038] This specific embodiment is only an explanation of the present invention, and it is not a limitation of the present invention. After reading this specification, those skilled in the art can make modifications to this embodiment without creative contributions according to needs, but as long as it is within the scope of the claims of the present invention, it is protected by the patent law.

Claims

1. A pedicle screw for spinal surgery, comprising a screw (1) and a nail seat (2), the nail seat (2) being connected to the upper end of the screw (1), characterized in that: A fixing component (3) for enhancing fixation is provided on the screw (1). An installation groove (11) is formed in the screw (1) and penetrates through the upper end of the nail seat (2). A plurality of screw holes (12) communicating with the outside are formed on the peripheral side of the installation groove (11). One end of the screw hole (12) located on the outside is inclined downward. The fixing component (3) includes fixing nails (31) and connecting heads (32). A plurality of fixing nails (31) are provided and are respectively inserted into the screw holes (12). The fixing nails (31) are threadedly connected to the screw holes (12). The connecting head (32) is connected to one end of the fixing nail (31) located in the installation groove (11). A rotating mechanism (4) is inserted into the installation groove (11). The rotating mechanism (4) drives each connecting head (32) to rotate, and inserts the fixing nail (31) into the pedicle.

2. The pedicle screw for spinal surgery according to claim 1, wherein: The angle between the screw hole (12) and the horizontal plane is 0 - 60°.

3. The pedicle screw for spinal surgery according to claim 2, wherein: The connecting head (32) is a first bevel gear. The diameter of one end of the first bevel gear close to the fixing nail (31) is larger than that of the other end. The rotating mechanism (4) includes a handle (41), a connecting rod (42), a slider (43), a plurality of connecting blocks (44) and a plurality of second bevel gears (45). The lower end of the handle (41) is connected to the connecting rod (42). The lower end of the connecting rod (42) is connected to the slider (43). The slider (43) is slidably matched with the installation groove (11). The lower end of the slider (43) is connected to the plurality of second bevel gears (45). The diameters of the second bevel gears (45) gradually decrease from top to bottom. Adjacent two second bevel gears (45) are connected by the connecting block (44). Each second bevel gear (45) can be meshed with the first bevel gear. When the tip of the fixing nail (31) retracts into the screw hole (12), the second bevel gear (45) located at the lowermost end is meshed with the first bevel gear. When the fixing nail (31) completely extends out of the screw hole (12), the second bevel gear (45) located at the uppermost end is meshed with the first bevel gear.

4. The pedicle screw for spinal surgery according to claim 3, characterized in that: A storage groove (13) with a diameter smaller than that of the installation groove (11) is formed at the bottom of the installation groove (11). The storage groove (13) is used for the downward movement of the second bevel gear (45).

5. A pedicle screw for spinal surgery according to claim 4, characterized in that: An internal hexagonal groove (14) is formed at the open end of the installation groove (11).

6. The pedicle screw for spinal surgery according to claim 5, wherein: A through hole (15) penetrating the screw (1) is formed at the bottom of the installation groove (11).

7. The pedicle screw for spinal surgery according to claim 6, characterized in that: The screw (1) is provided with a first thread (16) and a second thread (17). The first thread (16) is arranged below the fixing component (3), and the second thread (17) is arranged above the fixing component (3).

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