Spinal screw with reamer and bone cement composite function

Abstract

The utility model relates to a kind of spinal screw with reamer and bone cement composite function, including screw body, its innovation point is at:The screw body has bone cement injection channel, the screw body has the vertebral body cancellous bone holding part, pedicle cortical bone holding part and tool operating part that are connected as a whole and coaxially arranged, the vertebral body cancellous bone holding part outer periphery has the bone scraping part for scraping the hardened dead bone of vertebral body periphery.This utility model can scrape the hardened dead bone around vertebral body cavity synchronously in implantation process, and can also improve the binding force of subsequent bone cement and vertebral bone, which not only simplifies the dead bone operation steps and improves the scraping efficiency, but also ensures that the bone cement does not slip, maintains the vertebral body height and the subsequent recovery effect of vertebral body.

Description

Technical Field

[0001] This utility model relates to a spinal screw, specifically a spinal screw with a reamer and bone cement composite function, belonging to the field of medical device technology. Background Technology

[0002] Kummell's disease is a rare post-traumatic ischemic necrosis of the vertebral body. After vertebral ischemia, the trabeculae are gradually absorbed, forming a "vacuum gap sign", which eventually leads to loss of vertebral height and spinal deformity. It is more common in middle-aged and elderly people with osteoporosis.

[0003] Current conventional treatment involves first establishing an implantation channel for the spinal screw using an opening device and a pedicle screwdriver. Then, a small bone curette is used to scrape away hardened necrotic bone around the vertebral cavity to increase the bonding strength between the bone cement and the bone. After the necrotic bone is removed, the spinal screw is finally implanted into the channel, and bone cement is injected through the screw to bond with the bone. However, due to limitations in the size, range, and angle of the pedicle screw channel, the removal of necrotic bone is not very effective. This directly leads to poor bonding between the bone cement and the vertebral body bone during subsequent injection. After the vertebral body is stretched open by the bone cement, the poor bonding strength causes the bone cement to slip, affecting the restoration of vertebral height.

[0004] Therefore, there is a clinical need for a bone cement injection product that can simplify the procedure of scraping away hardened dead bone, or improve scraping efficiency, and can also easily maintain vertebral height. Utility Model Content

[0005] The purpose of this invention is to provide a spinal screw that combines the functions of a reamer and bone cement, which can simultaneously scrape away hardened necrotic bone around the vertebral cavity during implantation and enhance the bonding force between the subsequent bone cement and the vertebral bone. This not only simplifies the necrotic bone removal process and improves scraping efficiency, but also ensures that the bone cement does not slip, thus facilitating the maintenance of vertebral height and subsequent vertebral recovery.

[0006] To achieve the above objectives, the technical solution of this utility model is: a spinal screw with a reamer and bone cement composite function, comprising a screw body, the innovation of which lies in:

[0007] The screw body has a bone cement injection channel.

[0008] The screw body has a vertebral cancellous bone holding part, a pedicle cortical bone holding part, and a tool operating part that are integrally connected and coaxially arranged.

[0009] The periphery of the vertebral cancellous bone holding portion has a scraping portion for scraping away hardened dead bone around the vertebral body.

[0010] In the above technical solution, the outer periphery of the vertebral cancellous bone holding part has a plurality of spirally arranged large threaded ribs, and the outer wall of the vertebral cancellous bone holding part is provided with a plurality of flat grooves along its axial direction. The grooves divide the plurality of spirally arranged large threaded ribs into a plurality of arc-shaped threaded ribs, thereby forming a bone scraping part. This bone scraping part can not only scrape away the hardened dead bone around the vertebral body, but also strengthen the holding force in the vertebral cancellous bone.

[0011] In the above technical solution, the pitch of the large threaded rib on the outer periphery of the vertebral cancellous bone holding part is 3mm to 6mm, and the depth is 1mm to 2.5mm.

[0012] In the above technical solution, the head of the vertebral cancellous bone holding part is provided with multiple bone cement filling grooves and multiple reamer blades with the ability to cut dead bone by lifting screws along its circumference, and the multiple reamer blades and multiple bone cement filling grooves are arranged at intervals.

[0013] In the above technical solution, the vertebral cancellous bone holding part is provided with multiple bone cement overflow through holes that communicate with the bone cement injection channel.

[0014] In the above technical solution, the bone cement overflow hole is a circular hole or a polygonal hole.

[0015] In the above technical solution, the outer periphery of the pedicle cortical bone holding part has small threads to enhance the holding force in the pedicle cortical bone, and the small threads are 1.5mm to 3mm in diameter and 1mm to 2.5mm in depth.

[0016] In the above technical solution, the tool operating part includes a ball head, and the ball head has a tool insertion inner hole communicating with the bone cement injection channel.

[0017] In the above technical solution, the tail of the tool operating part is provided with a pair of extension plates arranged symmetrically along it and used to connect with the bone cement injector.

[0018] In the above technical solution, the connection between the tool operating part and the extension piece is provided with a wedge-shaped groove to facilitate breaking the extension piece, and the inner wall of the extension piece is provided with an internal thread for connecting with the bone cement injector.

[0019] The positive effects of this invention are: When using the spinal screw with both reamer and bone cement composite function, the screw body of this invention has a bone cement injection channel.

[0020] The screw body has a vertebral cancellous bone holding part, a pedicle cortical bone holding part, and a tool operating part that are integrally connected and coaxially arranged.

[0021] The periphery of the vertebral body cancellous bone holding portion has a scraping portion for scraping away hardened dead bone around the vertebral body.

[0022] In this invention, an implantation channel is pre-established using an opening device and a trephine cone. During implantation, as the spinal screw advances, the hardened necrotic bone around the vertebral cavity is scraped away by the scraper, improving the bonding effect of the injected bone cement. This replaces the existing technique of using a small bone scraper to remove necrotic bone. In application, the operating space is no longer limited by the size of the implantation channel, the operating range, or the angle. The spinal screw of this invention can simultaneously scrape away hardened necrotic bone during implantation, simplifying the scraping process, greatly improving efficiency, and ensuring that the bone cement does not slip, thus facilitating the maintenance of vertebral height and subsequent vertebral recovery. Attached Figure Description

[0023] Figure 1 This is a structural schematic diagram of a specific embodiment of the present invention;

[0024] Figure 2 yes Figure 1 A side view diagram;

[0025] Figure 3 yes Figure 2 AA sectional view;

[0026] Figure 4 yes Figure 1 A diagram showing the view from below;

[0027] Figure 5 yes Figure 1 A top-down view;

[0028] Figure 6 This is a three-dimensional structural diagram of the present invention. Detailed Implementation

[0029] The present invention will be further described below with reference to the accompanying drawings and the given embodiments, but it is not limited thereto.

[0030] like Figure 1 , 2 As shown in Figures 3, 4, 5, and 6, a spinal screw with combined reamer and bone cement functions includes a screw body 1.

[0031] The screw body 1 has a bone cement injection channel 10.

[0032] The screw body 1 has a vertebral cancellous bone holding part 11, a pedicle cortical bone holding part 12, and a tool operating part 13 that are integrally connected and coaxially arranged.

[0033] The periphery of the vertebral cancellous bone holding portion 11 has a scraping portion 111 for scraping away hardened dead bone around the vertebral body.

[0034] Furthermore, such as Figure 1 , 2 As shown in Figures 3 and 6, in order to simultaneously scrape away the hardened dead bone around the vertebral cavity during screw implantation, the outer periphery of the vertebral cancellous bone holding part 11 has multiple spirally arranged large threaded ribs. The outer wall of the vertebral cancellous bone holding part 11 is provided with multiple flat grooves 112 along its axial direction, and the grooves 112 divide the multiple spirally arranged large threaded ribs into multiple arc-shaped threaded ribs, thereby constructing a scraping part 111. This scraping part 111 can not only scrape away the hardened dead bone around the vertebral body, but also strengthen the holding force in the vertebral cancellous bone.

[0035] The advantages of the bone-scraping part 111 of this utility model are as follows:

[0036] (1) This utility model utilizes the design of the groove 112 to construct multiple arc-shaped threaded ribs, which can improve the sharpness of the screw cutting bone, similar to the function of a reamer, and has a better removal effect on hardened dead bone. It can allow the screw to remove the dead bone cleanly during the advance process, and improve the bonding effect with bone after subsequent injection of bone cement.

[0037] (2) The outer periphery of the vertebral cancellous bone holding part 11 of the present invention is provided with three flat grooves arranged along its axial direction. The three grooves are evenly distributed at 120° along the circumference and are in the shape of plum blossoms. After the bone cement is injected, it can fully wrap the spinal screw body, increase the contact area of ​​the spinal screw after being wrapped by the bone cement, effectively prevent the screw from rotating, and improve the stability of the screw after implantation.

[0038] Furthermore, in order to improve the holding force of the screw in the vertebral cancellous bone, the pitch of the large threaded rib on the outer periphery of the vertebral cancellous bone holding part 11 is 3mm to 6mm, and the depth is 1mm to 2.5mm.

[0039] Furthermore, such as Figure 1 , 2 As shown in Figures 4 and 6, to enhance the bonding force between the screw and the vertebral body through bone cement, the head of the vertebral body cancellous bone holding portion 11 is provided with multiple bone cement filling grooves 114 and multiple reamer blades 113 to enhance the screw's ability to cut dead bone, and the multiple reamer blades 113 and multiple bone cement filling grooves 114 are arranged at intervals. When bone cement flows out from the end of the vertebral body cancellous bone holding portion 11, it fills the bone cement filling grooves, strengthening the bonding force between the screw end and the vertebral body.

[0040] Furthermore, such as Figure 2 ,3 As shown in Figure 6, in order to enable the bone cement to encapsulate the screw, prevent the screw from loosening, and improve the stability of the implant fixation, the vertebral cancellous bone holding portion 11 is provided with multiple bone cement overflow holes 115 communicating with the bone cement injection channel 10. Specifically, multiple bone cement overflow holes 115 are arranged along the length of one of the flat grooves 112 and along the symmetrical direction of the flat groove 112.

[0041] Furthermore, the bone cement overflow hole 115 described in this invention is a circular hole or a polygonal hole. Of course, it is not limited to this and can also be other irregularly shaped holes.

[0042] Furthermore, in order to improve the holding force of the screw in the pedicle cortex, the outer periphery of the pedicle cortex holding portion 12 has small threads 121, and the pitch of the small threads 121 is 1.5mm to 3mm, and the depth is 1mm to 2.5mm.

[0043] Furthermore, such as Figure 3 , 5 As shown, to facilitate screw implantation, the tool operating part 13 includes a ball head 131, and the ball head 131 has a tool insertion inner hole 132 communicating with the bone cement injection channel 10. Specifically, a screwdriver can be directly inserted into the tool insertion inner hole 132 of the ball head 131 to ensure that the screw can be implanted along the established implantation channel.

[0044] Furthermore, such as Figure 1 , 2 As shown in Figures 3 and 6, in order to facilitate quick positioning and connection with the bone cement injector, the tail of the tool operating part 13 is provided with a pair of extension plates 2 arranged symmetrically along it for connection with the bone cement injector.

[0045] Furthermore, such as Figure 2 , 6 As shown, in order to facilitate the breakage of the extension piece after the operation, reduce the connection strength between the extension piece and the ball head, and ensure that the break point is blunt and will not cause injury to the human body due to sharpness, the tool operation part 13 is provided with a wedge-shaped groove 3 at the connection between the extension piece 2 and the extension piece 2 to facilitate the breakage of the extension piece 2. In order to form a quick positioning connection between the extension piece and the bone cement injector, the inner wall of the extension piece 2 is provided with an internal thread for connection with the bone cement injector.

[0046] The specific operation process of this utility model is as follows: An implantation channel is established beforehand using an opening tool and a cutting cone. Then, during the implantation process, the spinal screw is first cut open by the reamer blade 113, which greatly improves the screw's ability to cut necrotic bone while reducing the screw's screw-in torque. As the spinal screw advances, the scraper part 111 scrapes away the hardened necrotic bone around the vertebral cavity, improving the bonding effect with bone after subsequent bone cement injection. This replaces the existing technology that uses a small bone scraper to remove necrotic bone. In application, the operating space of this utility model is no longer limited by the size of the implantation channel, the operating range, or the limited angle, allowing the spinal screw to simultaneously scrape away hardened necrotic bone during implantation. This not only simplifies the scraping steps but also greatly improves scraping efficiency.

[0047] After the spinal screw is implanted, the threaded head of the bone cement injector is connected to the internal thread of the extension piece 2. The bone cement is injected along the bone cement injection channel 10. When the bone cement flows out from the end of the vertebral cancellous bone holding part 11, it will fill the bone cement filling groove 114 and also fill the flat groove 112 through the bone cement overflow through hole 115. This allows the bone cement to fully cover the screw after injection, increasing the contact area of ​​the screw after being covered by bone cement. This can effectively prevent the screw from rotating and improve the stability of the screw after implantation.

[0048] After the bone cement is injected, the bone cement injector is separated from the extension piece 2. Under the action of the wedge-shaped groove 3, the extension piece is easily broken after the operation, and the fracture site is kept blunt to prevent damage to the human body due to sharpness.

[0049] In summary, this invention can simultaneously scrape away the hardened necrotic bone around the vertebral cavity during implantation, and can also improve the bonding force between the subsequent bone cement and the vertebral bone. It not only simplifies the necrotic bone removal process and improves the scraping efficiency, but also ensures that the bone cement will not slip, which is convenient for maintaining the vertebral height and the subsequent recovery effect of the vertebral body.

[0050] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A spinal screw with reamer and bone cement composite functions, comprising a screw body (1), characterized in that: The screw body (1) has a bone cement injection channel (10), The screw body (1) has a vertebral cancellous bone holding part (11), a pedicle cortical bone holding part (12), and a tool operating part (13) that are connected as one piece and arranged coaxially. The periphery of the vertebral cancellous bone holding portion (11) has a scraping portion (111) for scraping away the hardened dead bone around the vertebral body.

2. The spinal screw with reamer and bone cement composite function according to claim 1, characterized in that: The outer periphery of the vertebral cancellous bone holding part (11) has a plurality of spirally arranged large threaded ribs. The outer wall of the vertebral cancellous bone holding part (11) is provided with a plurality of flat grooves (112) along its axial direction. The grooves (112) divide the plurality of spirally arranged large threaded ribs into a plurality of arc-shaped threaded ribs, thereby forming a bone scraping part (111). The bone scraping part (111) can scrape away the hardened dead bone around the vertebral body and strengthen the holding force in the vertebral cancellous bone.

3. The spinal screw with reamer and bone cement composite function according to claim 2, characterized in that: The pitch of the large threaded rib on the outer periphery of the vertebral cancellous bone holding part (11) is 3m to 6mm, and the depth is 1mm to 2.5mm.

4. The spinal screw with reamer and bone cement composite functions according to claim 1, characterized in that: The head of the vertebral cancellous bone holding part (11) is provided with multiple bone cement filling grooves (114) and multiple reamer blades (113) with the ability to cut dead bone by lifting screws, and the multiple reamer blades (113) and multiple bone cement filling grooves (114) are arranged at intervals.

5. The spinal screw with reamer and bone cement composite functions according to claim 1, characterized in that: The vertebral cancellous bone holding part (11) is provided with multiple bone cement overflow holes (115) communicating with the bone cement injection channel (10).

6. The spinal screw with reamer and bone cement composite function according to claim 5, characterized in that: The bone cement overflow orifice (115) is either a circular or a polygonal orifice.

7. The spinal screw with reamer and bone cement composite functions according to claim 1, characterized in that: The outer periphery of the pedicle cortical bone holding portion (12) has small threads (121) for enhancing the holding force in the pedicle cortical bone, and the pitch of the small threads (121) is 1.5 mm to 3 mm and the depth is 1 mm to 2.5 mm.

8. The spinal screw with reamer and bone cement composite functions according to claim 1, characterized in that: The tool operating part (13) includes a ball head (131), and the ball head (131) has a tool insertion inner hole (132) communicating with the bone cement injection channel (10).

9. The spinal screw with reamer and bone cement composite functions according to claim 1, characterized in that: The tool operating section (13) has a pair of extension plates (2) arranged symmetrically along it for connection with the bone cement injector.

10. The spinal screw with reamer and bone cement composite function according to claim 9, characterized in that: The tool operating part (13) is provided with a wedge-shaped groove (3) at the connection between the extension piece (2) and the extension piece (2) to facilitate breaking the extension piece (2). The inner wall of the extension piece (2) is provided with an internal thread for connection with the bone cement injector.

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