Flip-assembled enhanced universal pedicle screw and universal pedicle screw-rod system

Abstract

The present application relates to the field of medical devices, and in particular to a flip-up assembly enhanced universal pedicle screw and a universal pedicle screw rod system, wherein the flip-up assembly enhanced universal pedicle screw comprises a main screw, a secondary screw detachably connected to the main screw, and a connector detachably connected to the secondary screw, wherein the main screw comprises a screw head, a screw rod, and a neck located between the screw head and the screw rod, wherein the diameter of the neck is smaller than the diameter of the screw head and the screw rod, one end of the secondary screw is sleeved on the neck, and one end of the connector extends from the screw head away from one end of the screw rod and is processed with a connecting thread. The present application has the advantages of improving the initial stability of the screw without increasing the number of surgical steps for the doctor, reducing the surgical time increased to improve the initial stability of the screw, and reducing the pain caused to the patient due to the long surgical time.

Description

Technical Field

[0001] The present application relates to the field of medical devices, and in particular to an inverted assembly enhanced universal pedicle screw and a universal pedicle screw-rod system. Background Art

[0002] Pedicle screws play a crucial role as a cornerstone in the treatment of spinal degenerative diseases, tumors, trauma, and inflammation. For patients undergoing long-segment fixation and fusion and those with severe osteoporosis, the pedicle screws at the end of the fixed segment are subject to tremendous stress. However, due to the limitations of the pedicle's anatomical morphology, traditional pedicle screws cannot achieve enhanced grip through external modifications. Instead, initial stability can only be enhanced through methods such as bone cement infusion, but this carries a significant risk of leakage. Therefore, how to enhance the grip of pedicle screws has become a pressing technical challenge for those skilled in the art.

[0003] Chinese utility model patent publication number CN215688343U discloses a modular reinforced pedicle screw and a pedicle screw assembly comprising a main screw and a secondary screw. The pedicle screw is connected to a spinal connecting rod via a connecting assembly comprising a ball joint, a hoop, a locking member, and a locking nut. The main screw has a larger diameter than the secondary screw, and its outer surface is provided with a relief groove extending along the main screw's axis. The relief groove also has multiple grooves formed on its surface for mating with the secondary screw's threads.

[0004] When doctors use the pedicle screws, after driving the main screw into the pedicle, they need to tighten the auxiliary screw onto the main screw, which increases the doctor's surgical steps, prolongs the operation time, and increases the patient's pain. Summary of the Invention

[0005] In order to improve the initial stability of the screw without increasing the number of surgical steps for the doctor, reduce the surgical time increased to improve the initial stability of the screw, and reduce the pain caused to the patient due to long surgical time, the present application provides an inverted assembly enhanced universal pedicle screw and universal pedicle screw rod system.

[0006] In a first aspect, the present application provides a flip-chip assembly enhanced universal pedicle screw, which adopts the following technical solution:

[0007] A flip-up assembly enhanced universal pedicle screw, comprising a main screw, a secondary screw detachably connected to the main screw, and a connector detachably connected to the secondary screw, wherein the main screw comprises a screw head, a screw rod, and a neck located between the screw head and the screw rod, wherein the diameter of the neck is smaller than the diameters of the screw head and the screw rod, one end of the secondary screw is sleeved on the neck, and one end of the connector extends out of the screw head away from one end of the screw rod and is processed with a connecting thread.

[0008] By adopting the above technical solution, before use, the auxiliary screw is first placed on the neck of the main screw, and then the connector is installed on the auxiliary screw, and then the connector is installed on the auxiliary screw, and the end of the connector away from the auxiliary screw extends out of the end of the screw head. When in use, directly install both the main screw and the auxiliary screw at the pedicle of the human body, and screw the main screw to drive the auxiliary screw to slide, thereby installing the main screw and the auxiliary screw together at the pedicle of the human body, and then install the spinal connecting rod on the connector, and make the spinal connecting rod abut against the end of the screw head away from the screw rod, and screw the nut on the connecting thread to fix the position of the spinal connecting rod on the connector. At the same time, when the nut is screwed into the position on the connecting thread, the force applied by the nut on the spinal connecting rod increases, so that the spinal connecting rod applies a force on the screw head to move in the opposite direction of the connecting thread. Since the main screw has been installed at the pedicle of the human body, the connector will slide axially relative to the main screw, and the connector also drives the auxiliary screw to slide axially relative to the main screw. At this time, the part of the auxiliary screw sleeved on the neck will slide in the direction of the screw head, so that the part of the auxiliary screw sleeved on the neck abuts against the connection between the neck and the screw head, thereby fixing the relative positions of the main screw and the auxiliary screw, reducing the probability of the main screw rotating relative to the auxiliary screw. At this point, the secondary screw also secures the position of the primary screw, reducing the probability of circumferential rotation of the primary screw and improving its initial stability. Because the primary and secondary screws can be assembled before surgery and do not need to be connected during surgery, the initial stability of the screw is improved without adding additional surgical steps to the surgeon's procedure. This reduces the operating room time required to improve the initial stability of the screw and reduces the pain caused to the patient by prolonged surgery.

[0009] Optionally, the auxiliary screw includes a connecting ring sleeved on the neck and a nail body fixedly connected to one side of the connecting ring, and the length direction of the nail body is consistent with the length direction of the screw rod.

[0010] By adopting the above technical solution, during installation, the connecting ring is directly placed on the neck, and the nail body is directed toward the screw rod, so that when the main screw is screwed onto the human pedicle, the nail body can be driven to be installed on the human pedicle synchronously.

[0011] Optionally, the screw head is a ball head, and a snap-in groove that cooperates with the ball head is provided on the inner wall of one end of the connecting ring facing the screw head.

[0012] By adopting the above technical solution, the contact area between the main screw and the auxiliary screw can be increased when the relative positions of the main screw and the auxiliary screw are fixed, ensuring that there is sufficient contact force between the main screw and the auxiliary screw.

[0013] Optionally, a notch connected to the inner ring of the connecting ring is provided on the outer wall of the connecting ring, and the notch passes through two opposite ends of the connecting ring.

[0014] By adopting the above technical solution and setting the notch, the diameter of the connecting ring itself can be changed, so that the connecting ring can be smoothly clamped on the neck of the main screw.

[0015] Optionally, the nail body has an arc-shaped cross-section, and the inner wall of the nail body fits with the outer surface of the screw body.

[0016] Optionally, a guide portion is provided at one end of the nail body away from the connecting ring, and the guide portion is inclined to the side away from the screw rod, and the distance between the guide portion and the screw rod gradually decreases from the end close to the connecting ring to the end away from the connecting ring.

[0017] By adopting the above technical solution, the auxiliary screw can be smoothly inserted into the pedicle of the human body.

[0018] Optionally, the connector includes a connecting tube sleeved on the connecting ring, a clamping ring is fixedly connected to the outer wall of the connecting ring, and a clamping groove for the clamping ring to be embedded is opened on the inner wall of the connector.

[0019] By adopting the above technical solution, the relative position of the connector and the auxiliary screw can be fixed by setting the clamping ring and the clamping groove. At the same time, the connecting tube can also be sleeved on the clamping ring to prevent the auxiliary screw from falling off the main screw due to the existence of the gap.

[0020] Optionally, the connector includes a connecting tube sleeved on the connecting ring, a clamping block is placed in the connecting tube, the clamping block is located on the side of the screw head away from the screw rod, and the side of the clamping block facing the screw head is provided with an abutment groove for the screw head to be embedded.

[0021] By adopting the above technical solution, when the spinal connecting rod is installed on the connector, the spinal connecting rod abuts against the end of the screw head through the clamping block. At the same time, the cooperation between the screw head and the abutment groove can increase the abutment area between the screw head and the spinal connecting rod, so as to further increase the initial stability of the main screw.

[0022] Optionally, anti-slip grooves are processed on a side of the screw head facing the clamping block.

[0023] By adopting the above technical solution, the friction between the screw head and the clamping block can be increased, and the probability of the screw head rotating can be reduced.

[0024] In a second aspect, the present application provides a universal pedicle screw-rod system, which adopts the following technical solution:

[0025] A universal pedicle screw-rod system comprises a plurality of flip-chip assembled enhanced universal pedicle screws as described in claims 1-9, and also comprises a spinal connecting rod connected to the connectors of the plurality of flip-chip assembled enhanced universal pedicle screws and a mounting nut for fixing the position of the spinal connecting rod on each of the connectors, wherein the mounting nut is located on the side of the spinal connecting rod away from the main screw, and the mounting nut is threadedly connected to the connecting thread.

[0026] By adopting the above technical solution, the position of the spinal connecting rod on the connector can be fixed by screwing the mounting nut onto the connecting bolt, and the spinal connecting rod can be fixed between the mounting nut and the main screw.

[0027] In summary, this application includes at least one of the following beneficial technical effects:

[0028] 1. This application provides a secondary screw that is sleeved on the neck of the main screw, and connects a connector to the secondary screw. When the spinal connecting rod is connected to the end of the screw head away from the screw shaft, by screwing a mounting nut or the like on the connecting thread, the connector can be driven to slide away from the screw shaft, thereby driving the portion of the secondary screw sleeved on the neck to abut between the neck and the screw head, thereby fixing the relative position between the main screw and the secondary screw.

[0029] 2. The setting of the notch makes it easy to smoothly fit the connecting ring on the neck of the main screw;

[0030] 3. The arrangement of the clamping ring and the clamping groove enables the connector to be detachably connected to the auxiliary screw while also being able to seal the gap of the auxiliary screw through the connector. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of the overall structure of the inverted assembly enhanced universal pedicle screw of the present application.

[0032] Figure 2 This is a schematic diagram of the explosion after the main screws and connectors are broken in this application.

[0033] Figure 3 This is a structural diagram to illustrate the auxiliary screw structure of this application.

[0034] Figure 4 This is a schematic diagram to illustrate the connection structure of each part of this application.

[0035] Figure 5 It is a schematic diagram of the overall structure of the universal pedicle screw-rod system of the present application.

[0036] Explanation of the accompanying drawings: 1. Main screw; 11. Screw head; 111. Screw groove; 112. Anti-slip groove; 12. Screw rod; 13. Neck; 2. Auxiliary screw; 21. Connecting ring; 211. Notch; 212. Snap groove; 213. Snap ring; 214. First chamfer; 22. Nail body; 221. Guide part; 3. Connector; 31. Connecting tube; 311. Snap groove; 312. Second chamfer; 32. Limiting plate; 33. Connecting thread; 4. Block; 41. Abutment groove; 42. Avoidance groove; 5. Spine connecting rod; 6. Mounting nut. DETAILED DESCRIPTION

[0037] The following is combined with Figure 1-5 This application is described in further detail.

[0038] The embodiment of the present application discloses a reverse assembly enhanced universal pedicle screw. Figure 1 The inverted assembly enhanced universal pedicle screw includes a main screw 1, a secondary screw 2 detachably connected to the main screw 1, and a connector 3 detachably connected to the secondary screw 2.

[0039] Reference Figure 1 and Figure 2 The main screw 1 includes a screw head 11, a screw shank 12, and a neck 13 integrally fixed between the screw head 11 and the screw shank 12. One end of the secondary screw 2 is sleeved onto the neck 13, and the other end is in contact with the sidewall of the screw shank 12. The diameter of the neck 13 is smaller than that of the screw head 11 and the screw shank 12, thereby securing the position of the secondary screw 2 on the neck 13. A connector 3 is mounted on the secondary screw 2. When a force is applied to the connector 3 away from the screw shank 12, the connector 3 causes the secondary screw 2 to slide axially relative to the main screw 1, causing the portion of the secondary screw 2 sleeved onto the main screw 1 to abut against the connection between the neck 13 and the screw head 11, thereby securing the relative position of the main screw 1 and the secondary screw 2. To facilitate the application of axial force to the connector 3, the end of the connector 3 away from the secondary screw 2 extends beyond the end of the screw head 11 away from the screw shank 12 and is machined with a connecting thread 33. This allows subsequent components to be screwed onto the connecting thread 33, causing the connector 3 to slide axially relative to the main screw 1.

[0040] Reference Figure 2The auxiliary screw 2 includes a connecting ring 21 that is sleeved on the neck 13 and a nail body 22 fixed to one side of the connecting ring 21. The nail body 22 is located on the side of the connecting ring 21 facing the screw rod 12, and the length direction of the nail body 22 is consistent with the direction of the screw rod 12. Among them, a notch 211 is opened on the outer wall of the connecting ring 21 and connected to the inner wall. The notch 211 passes through the opposite ends of the connecting ring 21, so that when the connecting ring 21 is sleeved on the neck 13, it can be directly sleeved on the neck 13 through the notch 211, which facilitates the installation of the connecting ring 21.

[0041] Reference Figure 2 and Figure 3 The cross-section of the nail body 22 is arc-shaped, and the inner arc surface of the nail body 22 abuts the outer wall of the screw rod 12. A guide portion 221 is fixed to the end of the nail body 22 away from the connecting ring 21. The distance between the guide portion 221 and the screw rod 12 gradually decreases from the side close to the connecting ring 21 to the side away from the connecting ring 21. Specifically, the guide portion 221 is inclined away from the screw rod 12, so that the side of the guide portion 221 facing the screw rod 12 always fits the screw rod 12, facilitating the insertion of the nail body 22 into the human pedicle.

[0042] In order to further facilitate the fixation of the nail body 22 on the human pedicle, the width of the end of the guide portion 221 away from the connecting ring 21 gradually decreases, making it easier to insert the nail.

[0043] Reference Figure 4 The screw head 11 is spherical, and a snap-in groove 212 that cooperates with the ball head is provided on the inner wall of the connecting ring 21 facing the screw head 11, so that when an axial force is applied to the auxiliary screw 2 through the connector 3, the snap-in groove 212 can abut on the screw head 11 to increase the abutment area between the connecting ring 21 and the main screw 1, thereby increasing the abutment force between the connecting ring 21 and the main screw 1, so that the position fixation between the main screw 1 and the auxiliary screw 2 is more stably.

[0044] Among them, a screw groove 111 for an external wrench to be inserted is opened at the end of the screw head 11 away from the screw rod 12. The cross-section of the screw groove 111 can be a cross, a hexagon, etc. In this application, the screw groove 111 is illustrated as a regular hexagon, which is convenient for driving the main screw 1 to be screwed into the human pedicle through the cooperation of an external operating wrench and the screw groove 111.

[0045] Reference Figure 1The connector 3 includes a connecting tube 31 sleeved on the connecting ring 21 and two arc-shaped limiting plates 32 fixed to one end of the connecting tube 31. The two limiting plates 32 are arranged at equal intervals around the axis of the connecting tube 31, and an installation space for the spinal connecting rod 5 to be embedded is formed between the two limiting plates 32. Connecting threads 33 are provided on the two limiting plates 32. Specifically, the connecting threads 33 can be external threads provided on the outer arc surfaces of the two limiting plates 32, or internal threads provided on the inner arc surfaces of the two limiting plates 32. This application takes the example of the connecting threads 33 provided on the inner arc surfaces of the two limiting plates 32 as an example, and the connecting threads 33 on the two limiting plates 32 form a complete spiral line to achieve cooperation with the same mounting nut.

[0046] There is a gap between the two limiting plates 32 for the spinal column connecting rod 5 to be inserted into, so that multiple pedicle screws can be connected together through the spinal column connecting rod 5 .

[0047] Reference Figure 4 A snap ring 213 is fixed to the outer wall of the connecting ring 21, and a groove 311 for the snap ring 213 to be inserted into is formed on the inner wall of the connecting tube 31. By inserting the snap ring 213 into the groove 311, the connector 3 and the secondary screw 2 can be detachably connected. At the same time, the cooperation between the snap ring 213 and the groove 311 can also seal the notch 211 of the connecting ring 21 through the connecting tube 31, preventing the connecting ring 21 from falling off the neck 13 and affecting the circumferential fixation of the secondary screw 2 to the main screw 1.

[0048] When in use, directly install the auxiliary screw 2 on the main screw 1, then move the end of the connecting tube 31 away from the limiting plate 32 toward the screw head 11, and make the clamping ring 213 fit into the clamping groove 311.

[0049] Among them, in order to facilitate the smooth embedding of the snap ring 213 into the slot 311, a first chamfer 214 is provided on the outer wall of the end of the snap ring 213 away from the nail body 22, and a second chamfer 312 is provided on the inner wall of the end of the connecting tube 31 away from the limit plate 32. When the connecting tube 31 is sleeved on the connecting ring 21, the second chamfer 312 abuts against the first chamfer 214, and the snap ring 213 is embedded in the slot 311 along the abutting surface between the first chamfer 214 and the second chamfer 312, thereby completing the installation and fixation of the connector 3 and the auxiliary screw 2.

[0050] When the spinal connecting rod 5 applies a force to the main screw 1 away from the connector 3 by screwing the mounting nut 6, the connector 3 will slide relative to the main screw 1 in the direction away from the screw rod 12. At this time, the side wall of the snap-fit ​​groove 212 abuts against the screw head 11, and the side wall of the snap-fit ​​groove 311 also abuts against the snap ring 213, making the abutment force between the main screw 1 and the auxiliary screw 2 stronger, further increasing the initial installation stability of the main screw 1.

[0051] Reference Figure 4 A block 4 is placed in the connecting tube 31. A spherical abutment groove 41 is provided on the side of the block 4 facing away from the limit plate 32. The end of the screw head 11 away from the screw rod 12 abuts against the block 4. A avoidance groove 42 connected to the screw groove 111 is provided on the block 4 to ensure that an external wrench can be connected to the screw groove 111 through the avoidance groove 42. When the spinal connecting rod 5 is fixed to the connector 3 by the mounting nut 6, the spinal connecting rod 5 will abut against the screw head 11 through the block 4. Since the screw head 11 is spherical, the abutment area between the spinal connecting rod 5 and the screw head 11 can be increased. When the mounting nut 6 is screwed, the spinal connecting rod 5 abuts against the screw head 11 through the block 4, increasing the abutment force applied to the screw head 11, further increasing the initial installation stability of the main screw 1.

[0052] Reference Figure 2 and Figure 4 Anti-slip grooves 112 are processed on the outer wall of the screw head 11. The screw head 11 abuts against the block 4 through the anti-slip grooves 112, which can increase the friction between the screw head 11 and the block 4 and reduce the probability of relative rotation between the screw head 11 and the block 4.

[0053] The implementation principle of the flip-up assembly enhanced universal pedicle screw of the embodiment of the present application is as follows: before use, the mounting ring of the auxiliary screw 2 can be clamped on the neck 13 of the main screw 1, and then the connecting tube 31 can be placed on the mounting ring and the clamping ring 213 can be inserted into the clamping groove 311 to achieve the installation and fixation of the connector 3 and the auxiliary screw 2; then the clamping block 4 can be placed into the connecting tube 31. During the operation, the doctor can directly screw the main screw 1 into the human pedicle. While screwing the main screw 1, the main screw 1 also drives the auxiliary screw 2 to slide toward the human pedicle until both the main screw 1 and the auxiliary screw 2 are fixed to the human pedicle. Then, the spinal connecting rod 5 is placed in the gap between the two limiting plates 32, and the mounting nut 6 is screwed onto the connecting threads 33 on the two limiting plates 32. The mounting nut 6 will apply a force to the main screw 1 away from the connector 3 through the spinal connecting rod 5. Since the main screw 1 is fixed to the human pedicle, the mounting nut 6 will drive the connector 3 to slide in a direction away from the main screw 1, so that the connector 3 drives the auxiliary screw 2 to slide axially relative to the main screw 1, so that the clamping groove 212 abuts against the screw head 11, the side wall of the clamping groove 311 abuts against the retaining ring 213, and the clamping block 4 abuts against the screw head 11, so as to fix the relative position of the main screw 1 and the auxiliary screw 2. The circumferential position of the main screw 1 can be fixed by the auxiliary screw 2, reducing the probability of rotation of the main screw 1 and increasing the initial stability of the main screw 1. Moreover, since the auxiliary screw 2 and the connector 3 can be assembled on the main screw 1 in advance before the operation, it is achieved without increasing the number of surgical steps for the doctor while also improving the initial stability of the screw.

[0054] The present application also discloses a universal pedicle screw rod system. Figure 5 The universal pedicle screw-rod system includes the above-mentioned flip-up assembly enhanced universal pedicle screw, a spinal connecting rod 5 connected to multiple flip-up assembly enhanced universal pedicle screws, and a mounting nut 6 connected to each flip-up assembly enhanced universal pedicle screw.

[0055] The spinal connecting rod 5 is placed in the installation space of multiple inverted assembled enhanced universal pedicle screws at the same time, and the mounting nut 6 is located on the side of the spinal connecting rod 5 away from the main screw 1 and the mounting nut 6 is threadedly engaged with the connecting threads 33 on the two limit plates 32.

[0056] The implementation principle of a universal pedicle screw-rod system in an embodiment of the present application is: after multiple flip-chip enhanced universal pedicle screws are fixed on the human pedicles, the spinal connecting rod 5 is placed in the installation space of multiple flip-chip enhanced universal pedicle screws at the same time, and the mounting nut 6 is screwed on the limit plate 32 of the same flip-chip enhanced universal pedicle screw, so as to fix the position of the spinal connecting rod 5 on the connector 3 and complete the surgical operation.

[0057] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A reverse assembly enhanced universal pedicle screw, characterized by: The invention comprises a main screw (1), a secondary screw (2) detachably connected to the main screw (1), and a connector (3) detachably connected to the secondary screw (2), wherein the main screw (1) comprises a screw head (11), a screw rod (12), and a neck (13) located between the screw head (11) and the screw rod (12), wherein the diameter of the neck (13) is smaller than the diameters of the screw head (11) and the screw rod (12), one end of the secondary screw (2) is sleeved on the neck (13), and one end of the connector (3) extends out of the end of the screw head (11) away from the screw rod (12) and is processed with a connecting thread (33); The auxiliary screw (2) comprises a connecting ring (21) sleeved on the neck (13) and a nail body (22) fixed to one side of the connecting ring (21), and the length direction of the nail body (22) is consistent with the length direction of the screw rod (12); The screw head (11) is a ball head, and a clamping groove (212) that cooperates with the ball head is provided on the inner wall of one end of the connecting ring (21) facing the screw head (11); The connector (3) comprises a connecting tube (31) sleeved on the connecting ring (21); a snap ring (213) is fixedly connected to the outer wall of the connecting ring (21); and a snap groove (311) for the snap ring (213) to be embedded is provided on the inner wall of the connector (3).

2. The flip-assembled enhanced universal pedicle screw according to claim 1, characterized in that: A notch (211) communicating with the inner wall of the connecting ring (21) is provided on the outer wall of the connecting ring (21), and the notch (211) passes through two opposite ends of the connecting ring (21).

3. The flip-assembled enhanced universal pedicle screw according to claim 1, characterized in that: The nail body (22) has an arc-shaped cross section, and the inner wall of the nail body (22) fits in contact with the outer surface of the screw rod (12).

4. The flip-assembled enhanced universal pedicle screw according to claim 1, characterized in that: A guide portion (221) is provided at one end of the nail body (22) away from the connecting ring (21), and the guide portion (221) is inclined away from the screw rod (12). The distance between the guide portion (221) and the screw rod (12) gradually decreases from the end close to the connecting ring (21) to the end away from the connecting ring (21).

5. The flip-assembly reinforced universal pedicle screw according to claim 1, characterized in that: The connector (3) comprises a connecting tube (31) sleeved on the connecting ring (21), a clamping block (4) is placed in the connecting tube (31), the clamping block (4) is located on the side of the screw head (11) away from the screw rod (12), and an abutment groove (41) for the screw head (11) to be embedded is formed on the side of the clamping block (4) facing the screw head (11).

6. The flip-assembly reinforced universal pedicle screw according to claim 5, characterized in that: The side of the screw head (11) facing the clamping block (4) is processed with anti-slip grooves (112).

7. A universal pedicle screw-rod system, characterized by: It comprises a plurality of flip-chip assembled enhanced universal pedicle screws as described in any one of claims 1 to 6, and also comprises a spinal connecting rod (5) connected to the connectors (3) of the plurality of flip-chip assembled enhanced universal pedicle screws and a mounting nut (6) for fixing the position of the spinal connecting rod (5) on each of the connectors (3), wherein the mounting nut (6) is located on the side of the spinal connecting rod (5) away from the main screw (1), and the mounting nut (6) is threadedly connected to the connecting thread (33).

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