Pedicle screw and pedicle screw set

Abstract

The application discloses a pedicle screw and a pedicle screw kit. The pedicle screw body is provided with a first channel, a plurality of second channels and a liquid guide arranged in the second channel. The first channel penetrates the head and tail of the pedicle screw. The first end of the second channel is in communication with the first channel, and the second end of the second channel extends to the side wall of the pedicle screw. The liquid guide protrudes from the surface of the side wall of the pedicle screw. The second channel is configured to allow external substances to enter from the second end and contact the liquid guide. The liquid guide is configured to absorb the liquid in the first channel and conduct the liquid to the side wall of the pedicle screw. The second channel is arranged to facilitate the entry of bone chips. The liquid guide is arranged in the second channel to guide the growth direction of the bone in the pedicle screw, so that the pedicle screw and the bone are stably anchored.

Description

Technical Field

[0001] This invention relates to the field of medical devices, and more particularly to a pedicle screw and a pedicle screw kit. Background Technology

[0002] Pedicle screws are one of the most essential and widely used internal fixation devices in spinal surgery. Their core function is to anchor the screws to the vertebral bones through the pedicles, thereby achieving strong fixation, repositioning, decompression, and fusion of the spine. They are mainly used in situations where spinal instability, deformity, degeneration, trauma, tumors, and other conditions require reconstruction of spinal stability.

[0003] To prevent pedicle screws from coming loose from the bone foramen, bone cement channels are often created within the pedicle screws. By injecting bone cement, it enters the bone suture, thereby achieving stable fixation between the pedicle screw and the bone.

[0004] However, the use of bone cement has many drawbacks. First, the Young's modulus of bone cement is much greater than that of bone. Second, bone cement has a certain degree of toxicity, which is detrimental to human health. Summary of the Invention

[0005] To address the problems existing in the prior art, this invention discloses a pedicle screw and a pedicle screw kit, which can guide bone ingrowth into the pedicle screw, overcome the defects of bone cement, and enable the pedicle screw to be stably anchored to the bone.

[0006] The objective of this invention is achieved through the following technical solution:

[0007] A pedicle screw includes a first channel, several second channels, and a fluid-guiding element disposed within each of the second channel. The first channel extends through the head and tail of the pedicle screw. A first end of each second channel communicates with the first channel, and a second end of each second channel extends to the sidewall of the pedicle screw. The fluid-guiding element protrudes from the sidewall surface of the pedicle screw. The second channel is configured to allow external substances to enter from the second end and contact the fluid-guiding element. The fluid-guiding element is configured to absorb liquid within the first channel and conduct the liquid toward the sidewall of the pedicle screw.

[0008] Furthermore, the liquid guiding element is mesh-like.

[0009] Furthermore, the first end of the second channel is fixedly connected to the liquid guiding element.

[0010] Furthermore, the first end of the second channel is a fixed channel, and the channel in the second channel adjacent to the end of the fixed channel away from the fixed channel is a receiving channel, the diameter of the receiving channel being larger than the diameter of the fixed channel.

[0011] Furthermore, the channel adjacent to the receiving channel in the second channel is a screening channel, which is the second end of the second channel, and the aperture of the screening channel is smaller than the aperture of the receiving channel.

[0012] Furthermore, the second end of the second channel is inclined toward the tail of the pedicle screw.

[0013] Furthermore, the second end of the second channel is located between the tips of two adjacent threads of the pedicle screw.

[0014] Furthermore, the tip of the thread is inclined toward the tail of the pedicle screw.

[0015] Furthermore, the threaded side facing the tail of the pedicle screw is provided with a barb layer, and the barbs of the barb layer are inclined towards the second channel.

[0016] A pedicle screw kit includes any of the pedicle screws described above, and a suction tube that can pass through the first channel in the pedicle screw, wherein the suction tube has a plurality of discharge holes on its side wall.

[0017] Compared with the prior art, the beneficial effects of this invention are as follows: Through the arrangement of the second channel and the fluid-guiding component, when the pedicle screw is drilled into the bone hole, the resulting bone fragments enter the second channel and adhere to the fluid-guiding component; simultaneously, the fluid-guiding component extending beyond the pedicle screw also contacts the inner wall of the bone hole. When blood containing stem cells is infused into the first channel, the fluid-guiding component near the first channel absorbs the stem cell-containing blood, which flows along the fluid-guiding component until it contacts the outer wall of the bone hole. At this point, the bone fragments on the fluid-guiding component and the inner wall of the bone hole can both come into contact with the stem cells in the blood. Under the action of the stem cells, new bone forms around the bone fragments. Simultaneously, under the action of the stem cells, bone grows along the fluid-guiding component towards the second channel on the inner wall of the bone hole, eventually connecting with the new bone growing outside the bone fragments. Thus, the newly grown bone mainly grows into the second channel along the fluid-guiding component. Therefore, the present invention guides the growth direction of bone within the pedicle screw by setting up the fluid guiding component, so as to achieve stable anchoring of the pedicle screw and bone, and the new bone growing into the pedicle screw effectively overcomes the defects of bone cement. Attached Figure Description

[0018] Figure 1 This is a three-dimensional schematic diagram of the pedicle screw of the present invention;

[0019] Figure 2 This is a front view of the pedicle screw of the present invention;

[0020] Figure 3 yes Figure 2 Sectional view of section AA;

[0021] Figure 4 yes Figure 3 Enlarged diagram of section B;

[0022] Figure 5 This is a schematic diagram of the thread of the pedicle screw of the present invention;

[0023] Figure 6 This is a front view of the suction tube of the present invention.

[0024] In the picture:

[0025] 1a – First channel; 1b – Second channel; 1ba – Fixed channel; 1bb – Containing channel; 1bc – Screening channel; 1c – Thread; 1d – Barbed layer; 2a – Liquid outlet; 2b – Drainage groove; 2c – Tube body; 2d – Liquid suction section; 2e – Liquid suction slit. Detailed Implementation

[0026] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0028] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. Furthermore, the technical features involved in the different embodiments of this invention described below can be combined with each other as long as they do not conflict with each other.

[0029] To overcome the shortcomings of bone cement and enable pedicle screws to form a stable anchoring structure in the body more quickly, this invention discloses a pedicle screw kit comprising pedicle screws.

[0030] like Figures 1 to 3 As shown, the pedicle screw body has a first channel 1a, several second channels 1b, and a fluid guide disposed within each of the second channels 1b. The first channel 1a penetrates the head and tail of the pedicle screw. The second channels 1b serve as bone holes for bone ingrowth into the pedicle screw. The first end of the second channel 1b communicates with the first channel 1a, and the second end of the second channel 1b extends to the side wall of the pedicle screw. Preferably, the first channel 1a is a through hole, and its length direction is along the axis of the pedicle screw; the second channels 1b are through holes, communicating with the first channel 1a and extending to the outside of the pedicle screw; each second channel 1b is symmetrically arranged about the axis of the pedicle screw. For details, see... Figure 3 As shown, the first channel 1a and the second channel 1b can be arranged in a fishbone pattern. This can guide the bone that grows into the second channel 1b to be evenly distributed in the pedicle screw with the axis of the pedicle screw as a reference.

[0031] The second channel 1b is configured to allow external substances to enter the second channel 1b from its second end, and to allow these external substances to contact a fluid-conducting component located within the second channel 1b. This external substance refers to bone fragments formed when the pedicle screw is drilled into the bone hole. These bone fragments enter the second channel 1b simultaneously with the drilling of the pedicle screw. The fluid-conducting component is configured to absorb the liquid within the first channel 1a and conduct the liquid towards the sidewall of the pedicle screw; simultaneously, the fluid-conducting component protrudes from the sidewall surface of the pedicle screw. In applications where the pedicle screw is drilled into the spinal column, the liquid absorbed by the fluid-conducting component is blood containing stem cells.

[0032] The fluid-conducting element is preferably mesh-like, allowing bone fragments entering the second channel 1b during pedicle screw drilling into the bone hole to be trapped and fixed onto the fluid-conducting element. The mesh-like fluid-conducting element can be an electrospun mesh made of polylactic-glycolic acid copolymer (PLGA). Alternatively, it can be a PEG-modified polyester (PLA / PGA) large-mesh woven mesh with a main mesh size of 300-800 μm (for trapping large-diameter bone fragments), and the fiber surface modified with PEG hydrophilicity to facilitate osteocyte attachment.

[0033] The fluid guiding component can also be non-mesh-like. For example, a porous fluid guiding component is a gelatin-sodium alginate composite porous hydrogel. Both gelatin (collagen hydrolysate) and sodium alginate (natural polysaccharide) are medical-grade materials with excellent biocompatibility. After freeze-drying, it forms a sponge-like structure, which allows bone fragments to be captured and fixed inside the sponge-like mesh.

[0034] The steps for using the pedicle screw of the present invention are as follows:

[0035] Step 1: Drill a bone hole in the spine, and then screw the pedicle screw of the present invention into the bone hole; during the drilling of the pedicle screw, the generated bone fragments enter the second channel 1b and come into contact with the fluid guide; after the pedicle screw reaches the set drilling position, since the fluid guide is set to protrude from the side wall surface of the pedicle screw, the fluid guide comes into contact with the side wall of the bone hole.

[0036] Step 2: After the pedicle screw reaches the set drilling position, the tip of the pedicle screw enters the medullary cavity, which is equivalent to the first channel 1a being connected to the medullary cavity; the blood containing stem cells located in the medullary cavity is drawn into the first channel 1a through an external suction device.

[0037] Step 3: Some blood in the first channel 1a will enter the second channel 1b. This can be achieved by placing one end of the fluid guide near the first channel 1a, or by inserting one end of the fluid guide into the first channel 1a, thus wetting one end of the fluid guide with blood. Subsequently, the blood will flow along the fluid guide towards the side wall of the bone hole until the entire fluid guide is soaked with blood.

[0038] Step 4: Over time, stem cells in the blood that come into contact with the inner wall of the bone hole differentiate and form new bone. This bone grows from the inner wall of the bone hole along the fluid guide into the second channel 1b. Similarly, bone fragments in contact with the fluid guide, influenced by stem cells in the blood, grow on the outside of the bone fragments. The bone that grows from the inner wall of the bone hole along the fluid guide into the second channel 1b will connect with the bone on the outside of the bone fragments, eventually filling the second channel 1b with new bone. Although not every second channel 1b will necessarily have bone fragments entering it, the presence of the fluid guide will still allow new bone to preferentially grow into the second channel 1b (if there were no fluid guide, more new bone might grow on the outer wall of the pedicle screw), eventually filling the second channel 1b with new bone.

[0039] In the axial direction surrounding the first channel 1a, each second channel 1b can be set at equal intervals around the axis of the first channel 1a. New bone grows into the second channel 1b from all directions, so that the pedicle screw body and the vertebral body are anchored earlier, and the distribution of new bone growing into the pedicle screw body is more uniform.

[0040] The present invention, through the setting of the second channel 1b and the liquid guiding element, enables the newly grown bone to mainly grow into the second channel 1b from the inner wall of the bone hole along the liquid guiding element. With the assistance of bone fragments, the second channel 1b is preferentially filled with new bone. The setting of the liquid guiding element guides the growth direction of the bone in the pedicle screw, which facilitates the stable anchoring of the pedicle screw body to the bone. Moreover, the new bone growing into the pedicle screw body effectively overcomes the defects of bone cement.

[0041] Of course, the pedicle screw of the present invention can also be used as a regular screw, such as when drilled into a wooden board. The function of the pedicle screw when it is drilled into and penetrates the wooden board differs from its function when drilled into bone. Specifically, when the pedicle screw is drilled into the wooden board, the wood chips generated during the drilling process enter the second channel 1b from one side of the pedicle screw's sidewall and come into contact with the liquid guide; that is, the external material is wood chips. At this time, the liquid guide is made of a porous fibrous material, such as non-woven fabric or absorbent paper, and is elongated. After the pedicle screw is fixed in place in the wooden board, a highly fluid liquid adhesive can be injected into the first channel 1a. The adhesive flows through the first channel 1a into the second channel 1b, so that the end of the liquid guide near the first channel 1a is wetted by the liquid adhesive. Subsequently, the liquid adhesive gradually transfers to the end of the liquid guide away from the first channel 1a until the entire liquid guide is completely soaked in liquid adhesive. The liquid guide extending from the sidewall surface of the pedicle screw then abuts against the sidewall of the hole in the wooden board. Once the glue on the fluid-conducting component has dried completely, the component, extending from the sidewall of the pedicle screw, will adhere to the sidewall of the hole in the wooden board, securing the pedicle screw to the board. Simultaneously, sawdust entering the second channel 1b will stick to the fluid-conducting component, preventing it from entering the first channel 1a. Residual glue in the first channel 1a can then be removed. The first channel 1a can then serve as a passage for a thin rope, allowing the pedicle screw to connect to other components.

[0042] In the pedicle screw of the present invention, many technical features, such as the detailed shape of the second channel 1b and the shape of the pedicle screw threads, have multiple embodiments. Below, for each of these technical features, including the detailed shape of the second channel 1b, one embodiment is selected for detailed description. This embodiment is referred to as "this embodiment." Other embodiments of the detailed shape of the second channel 1b and other features are referred to as "other embodiments," which are briefly described below.

[0043] In this embodiment, as Figure 3As shown, the first end of the second channel 1b is fixedly connected to the fluid guiding component. This means that the end of the fluid guiding component furthest from the inner wall of the bone hole is fixed in the second channel 1b near the first channel 1a. This has two advantages: firstly, by fixing the fluid guiding component to the second channel 1b, it is equivalent to fixing the fluid guiding component to the pedicle screw body, which helps prevent the fluid guiding component from falling off during the screwing of the pedicle screw into the bone hole. Secondly, fixing the fluid guiding component near the first channel 1a makes it easier for the fluid guiding component to come into contact with the blood flowing from the first channel 1a into the second channel 1b, thereby enabling the fluid guiding component to guide the blood to the inner wall of the bone hole. In other embodiments, the fluid guiding component can be longer, extending into the first channel 1a. In this case, the fluid guiding component can be not fixedly connected to the first channel 1a and the second channel 1b; during the screwing of the pedicle screw into the bone hole, the movement of the fluid guiding component is insufficient to cause it to leave the first channel 1a. In other embodiments, the liquid guide can be fixed at the second end of the second channel 1b (i.e., the liquid guide is fixed at the side wall of the second channel 1b near the pedicle screw body).

[0044] In this embodiment, as Figure 4 As shown, the first end of the second channel 1b is a fixed channel 1ba, and the channel adjacent to the fixed channel 1ba in the second channel 1b is a receiving channel 1bb, the diameter of which is larger than that of the fixed channel 1ba. As the name suggests, the receiving channel 1bb is used to receive bone fragments. The fixed channel 1ba and the fluid guiding element can be fixed by the fluid guiding element being inserted into the fixed channel 1ba, or by adhesive bonding between the fluid guiding element and the fixed channel 1ba. Preferably, after fixing the fluid guiding element, the fixed channel 1ba is configured to prevent bone fragments from passing through, thus preventing bone fragments from entering the first channel 1a through the fixed channel 1ba and then entering the medullary cavity. In this invention, the diameter of the receiving channel 1bb is set larger than that of the fixed channel 1ba to facilitate the intake of more bone fragments into the receiving channel 1bb, which is beneficial for the preferential growth of new bone within the receiving channel 1bb. Meanwhile, the inner wall of the receiving channel 1bb is designed as an arc surface. When a large number of bone fragments enter the receiving channel 1bb sequentially, the arc surface facilitates the bone fragments to roll towards the fixed channel 1ba, reducing the probability of some bone fragments clogging the receiving channel 1bb. In other embodiments, the fixed channel 1ba and the receiving channel 1bb may also have the same aperture.

[0045] In this embodiment, as Figure 4As shown, the channel adjacent to the end of the receiving channel 1bb furthest from the fixed channel 1ba in the second channel 1b is the screening channel 1bc, which is the second end of the second channel 1b. The aperture of the screening channel 1bc is smaller than that of the receiving channel 1bb, thereby preventing larger bone fragments from entering the receiving channel 1bb and causing blockage. Furthermore, the screening channel 1bc is funnel-shaped, with the larger opening located on the sidewall of the pedicle screw body, facilitating the entry of bone fragments into the receiving channel 1bb. In other embodiments, the aperture of the screening channel 1bc may be equal to that of the receiving channel 1bb. In other embodiments, the screening channel 1bc may be omitted, and the receiving channel 1bb may extend all the way to the sidewall of the pedicle screw body.

[0046] In this embodiment, as Figure 3 and Figure 4 As shown, the second end of the second channel 1b is inclined towards the tail of the pedicle screw. During the drilling process of the pedicle screw into the bone hole, the pedicle screw typically drills into the bone along the direction of gravity. Therefore, due to the inclination of the second channel 1b, bone fragments can more easily enter the receiving channel 1bb under gravity and accumulate there. In other embodiments, the axis of the second channel 1b may also be set perpendicular to the axis of the first channel 1a.

[0047] In this embodiment, as Figure 3 and Figure 4 As shown, the second end of the second channel 1b is located between the tips of two adjacent threads 1c of the pedicle screw, that is, the second channel 1b is positioned away from the threads 1c of the pedicle screw. The entire pedicle screw can be manufactured using additive manufacturing. The advantage of positioning the second channel 1b away from the threads 1c of the pedicle screw is that it effectively ensures the strength of the threads 1c, allowing the pedicle screw to be smoothly drilled into the bone hole. Simultaneously, there will be some gap between the sidewall of the pedicle screw and the bone hole, especially when the diameter of the pedicle screw body excluding the threads 1c is smaller than the diameter of the bone hole (in this case, the diameter of the pedicle screw at the threads 1c is larger than the diameter of the bone hole). Therefore, there is more gap between the two threads 1c to accommodate bone fragments, facilitating the collection of more bone fragments into the second channel 1b. In other embodiments, the second end of the second channel 1b can also be positioned on the threads 1c of the pedicle screw.

[0048] In this embodiment, as Figure 5As shown, the tip of thread 1c is inclined towards the tail of the pedicle screw. This has two advantages: firstly, bone fragments located between the two threads 1c can more easily enter the second channel 1b along the inclined surface of thread 1c. Preferably, the inclined surface of thread 1c facing the tail of the pedicle screw is defined as the first inclined surface. Bone fragments slide on the first inclined surface, and the second end opening of the second channel 1b is directly opposite the exit end of the bone fragments that slides on the first inclined surface due to gravity. Secondly, the connection between thread 1c and the bone hole is tighter, equivalent to an interference fit between thread 1c and the bone hole, making it less likely for the pedicle screw to come out of the bone hole. To facilitate drilling the pedicle screw into the bone hole, tapping can be performed on the bone hole first. In other embodiments, thread 1c and the bone hole can also be configured with a clearance fit.

[0049] In this embodiment, as Figure 5 As shown, a barb layer 1d is provided on the side of the thread 1c facing the tail of the pedicle screw, that is, a barb layer 1d is provided on the first inclined surface. The barbs of the barb layer 1d are inclined towards the direction of the second channel 1b, that is, the barbs of the barb layer 1d are inclined towards the inner side of the pedicle screw body. By providing the barb layer 1d, this invention makes it less likely for bone fragments to move away from the outer side of the pedicle screw body during the sliding process on the first inclined surface under gravity. The barb layer 1d can also be integrally formed with the pedicle screw body using an additive manufacturing process. In other embodiments, a frosted layer can be used instead of the barb layer 1d.

[0050] In this embodiment, as Figure 1 and Figure 2 As shown, the pedicle screw body is composed of several stacked crystal lattices. Preferably, the first channel 1a and each of the second channels 1b are separated from and do not communicate with each other. This invention, through the arrangement of the crystal lattices, effectively reduces the weight of the pedicle screw without significantly reducing its strength. Furthermore, even if some new bone grows into the crystal lattice, this amount is negligible compared to the amount of new bone growth in the second channel 1b. When the weight of the human body is applied to the pedicle screw, it does not cause significant uneven stress distribution within the pedicle screw. In other embodiments, to ensure the strength of the pedicle screw body, the crystal lattice may not be provided.

[0051] In this embodiment, as Figure 6 As shown above, this invention uses an external aspiration device to draw blood containing stem cells from the bone marrow cavity into the first channel 1a. The external aspiration device here refers to... Figure 6 The suction tube shown is part of the pedicle screw kit of the present invention. The suction tube is configured to pass through the first channel 1a in the pedicle screw, and a plurality of outlet holes 2a are provided on the side wall of the suction tube.

[0052] After the pedicle screws in the pedicle screw kit are fixed to the bone foramen, the suction tube in the pedicle screw kit is driven to enter the first channel 1a from the tail of the pedicle screw. Then, the suction tube is driven through the first channel 1a into the medullary cavity. Next, suction is applied to the suction tube, causing the blood containing stem cells in the medullary cavity to be drawn into the suction tube. At this time, the blood flows in the suction tube from the head of the pedicle screw towards the tail. During the process of applying suction to the suction tube, although blood will pass through the outlet hole 2a, due to the suction, the blood will not flow out of the outlet hole 2a. The device providing suction to the suction tube can be a gear pump or a centrifugal pump.

[0053] After a certain amount of blood containing stem cells is drawn from the suction tube, the suction force applied to the suction tube is removed. Subsequently, under the influence of gravity, some of the blood in the suction tube will flow out through the outlet hole 2a. The blood flowing out of the outlet hole 2a will flow in the area between the suction tube and the first channel 1a, and the blood will come into contact with the inner wall of the first channel 1a. As a result, some of the blood will enter the second channel 1b, and the guide element will also come into contact with the blood.

[0054] This invention, through the inclusion of a suction tube, facilitates the aspiration of blood containing stem cells from the bone marrow cavity into the first channel 1a. In other embodiments, the suction tube may be omitted, eliminating the need to draw blood containing stem cells from the bone marrow cavity into the first channel 1a during the use of the pedicle screw. Instead, blood containing stem cells is prepared beforehand from elsewhere, and after the pedicle screw is fixed to the bone foramen, the blood containing stem cells is poured into the first channel 1a.

[0055] In this embodiment, as Figure 6 As shown, the drainage holes 2a are arranged along the axis of the suction tube. The diameter of the drainage holes 2a increases sequentially along the axis of the suction tube. After the suction tube enters the first channel 1a, the diameter of each drainage hole 2a increases sequentially from inside the body to outside. Since the axis of the suction tube is usually arranged along the direction of gravity when suctioning blood from the bone marrow cavity, the blood near the drainage holes 2a facing the body has a higher pressure due to gravity compared to the blood near the drainage holes 2a farther from the body. Therefore, the drainage holes 2a are designed with a sequentially increasing diameter from inside the body to outside, so that the amount of blood flowing out of each drainage hole 2a is approximately the same; or the amount of blood flowing out of each drainage hole 2a increases sequentially from inside the body to outside, because the blood flowing out of the drainage holes 2a farther from the body will flow through the drainage holes 2a closer to the body, preventing excessive blood from flowing out of the drainage holes 2a closer to the body. In other embodiments, the diameter of each drain hole 2a may be the same.

[0056] In this embodiment, a drainage groove 2b spirally surrounds the outer wall of the suction tube, and each drainage hole 2a communicates with the drainage groove 2b. Because the second channels 1b can be equally spaced around the axis of the first channel 1a in the axial direction surrounding the first channel 1a, the spiral drainage groove 2b allows blood to flow along the inner wall of the first channel 1a in the circumferential direction, enabling the blood to contact the guiding elements in each second channel 1b. In other embodiments, when only two sets of second channels 1b are provided, with each second channel 1b in one set arranged sequentially along the axial direction of the first channel 1a, and the two sets of second channels 1b symmetrically arranged about the axis of the first channel 1a, the spiral drainage groove 2b is not required. In this case, the drainage holes 2a need to be symmetrically arranged with respect to the position of the suction tube.

[0057] In this embodiment, the aspiration tube includes a tube body 2c and an aspiration section 2d, with each drainage hole 2a located on the tube body 2c. The tube body 2c is connected to the aspiration section 2d, and the aspiration section 2d has an aspiration cavity communicating with the area inside the tube body 2c. During use, the aspiration section 2d first enters the first channel 1a, followed by the tube body 2c. Finally, the aspiration section 2d enters the bone marrow cavity, while the tube body 2c remains in the first channel 1a. The aspiration section 2d has an aspiration slit 2e connecting the aspiration cavity and the outside. The side of the aspiration section 2d away from the tube body 2c has a tip to facilitate its entry into the bone marrow cavity, and the aspiration slit 2e is located at the tip of the aspiration section 2d. Since the bone marrow cavity typically contains substances such as yellow bone marrow, mainly composed of fat cells, the tip of the aspiration section 2d facilitates the removal of these substances, allowing the aspiration slit 2e to contact the blood within the bone marrow cavity. By designing the suction slit 2e, this invention prevents larger substances such as yellow bone marrow from being easily drawn into the suction tube during blood aspiration. In other embodiments, to reduce production costs, the suction tube can also be designed as a regular cylindrical tube.

[0058] In summary, the pedicle screw of the present invention, through the design of the second channel 1b and the fluid guide, guides the growth direction of bone within the pedicle screw, facilitating stable anchoring of the pedicle screw body to the bone. Furthermore, the new bone ingrowth within the pedicle screw body effectively overcomes the defects of bone cement. The fixed connection between the first end of the second channel 1b and the fluid guide helps prevent the fluid guide from falling off during the screwing into the bone hole, while also allowing the fluid guide to easily contact the blood flowing from the first channel 1a into the second channel 1b. By setting the aperture of the receiving channel 1bb to be larger than that of the fixing channel 1ba, it promotes preferential growth of new bone within the receiving channel 1bb. By setting the aperture of the screening channel 1bc to be smaller than that of the receiving channel 1bb, it prevents larger bone fragments from entering the receiving channel 1bb. Finally, by setting the second end of the second channel 1b to be inclined towards the tail of the screw portion 1, bone fragments can more easily accumulate in the receiving channel 1bb due to gravity. By positioning the second end of the second channel 1b between the tips of two adjacent threads 1c of the pedicle screw, the strength of the threads is ensured while facilitating the collection of more bone fragments into the second channel 1b. Furthermore, by setting the tips of the threads 1c to be inclined towards the tail of the pedicle screw, bone fragments can more easily enter the second channel 1b along the inclined surface of the threads 1c, while also ensuring a tighter connection between the threads 1c and the bone hole. The barbed layer 1d prevents bone fragments from moving away from the outer side of the pedicle screw body. The pedicle screw body is composed of several stacked lattices, effectively reducing its weight. The suction tube facilitates the aspiration of blood containing stem cells from the bone marrow cavity into the first channel 1a. The drainage holes 2a are arranged with progressively increasing diameters from inside the body to outside, ensuring that the amount of blood flowing out of each drainage hole 2a is approximately the same. The spiral drainage groove 2b ensures that blood flows along the inner wall of the first channel 1a in the circumferential direction. Furthermore, the design of the suction slit 2e ensures that larger substances such as yellow bone marrow are not easily drawn into the suction tube during the blood suction process.

[0059] It should be emphasized that the above are merely preferred embodiments of the present invention and are not intended to limit the present invention in any way. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention shall still fall within the scope of the technical solution of the present invention.

Claims

1. A pedicle screw, characterized in that, The pedicle screw body is provided with a first channel (1a), a plurality of second channels (1b), and a fluid guide disposed in the second channel (1b). The first channel (1a) penetrates the head and tail of the pedicle screw. The first end of the second channel (1b) is connected to the first channel (1a), and the second end of the second channel (1b) extends to the sidewall of the pedicle screw, with the fluid guide protruding from the sidewall surface of the pedicle screw. The second channel (1b) is configured to allow external substances to enter from the second end and come into contact with the liquid guide; The fluid guide is configured to absorb the liquid in the first channel (1a) and conduct the liquid toward the sidewall of the pedicle screw.

2. The pedicle screw according to claim 1, characterized in that, The liquid guiding element is mesh-like.

3. The pedicle screw according to claim 1, characterized in that, The first end of the second channel (1b) is fixedly connected to the liquid guiding element.

4. The pedicle screw according to claim 3, characterized in that, The first end of the second channel (1b) is a fixed channel (1ba), and the channel adjacent to the fixed channel (1ba) in the second channel (1b) is a receiving channel (1bb), and the aperture of the receiving channel (1bb) is larger than the aperture of the fixed channel (1ba).

5. The pedicle screw according to claim 4, characterized in that, The channel in the second channel (1b) adjacent to the end of the receiving channel (1bb) away from the fixed channel (1ba) is the screening channel (1bc). The screening channel (1bc) is the second end of the second channel (1b), and the aperture of the screening channel (1bc) is smaller than the aperture of the receiving channel (1bb).

6. The pedicle screw according to claim 1, characterized in that, The second end of the second channel (1b) is inclined toward the tail of the pedicle screw.

7. The pedicle screw according to claim 1, characterized in that, The second end of the second channel (1b) is located between the tips of two adjacent threads (1c) of the pedicle screw.

8. The pedicle screw according to claim 7, characterized in that, The tip of the thread (1c) is inclined toward the tail of the pedicle screw.

9. The pedicle screw according to claim 8, characterized in that, The thread (1c) has a barb layer (1d) on the side facing the tail of the pedicle screw, and the barbs of the barb layer (1d) are inclined toward the second channel (1b).

10. A pedicle screw kit, characterized in that, Includes the pedicle screw as described in any one of claims 1 to 9, and a suction tube that can pass through the first channel (1a) in the pedicle screw, wherein the suction tube has a plurality of outlet holes (2a) on its side wall.

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