A general-purpose pedicle screw extractor

Abstract

The application discloses a general-purpose pedicle screw extractor, which comprises a handle, a main rod and an extractor head. The device provided by the application can be used to remove the pedicle screw when the doctor removes the screw cap and the connecting rod in the surgery of removing the spine nail rod system, and no suitable tool matches the driving system of the pedicle screw. The doctor first removes the screw cap by using the screw cap lifter, then places the cross rod of the extractor head in the connecting head of the pedicle screw, deflects the extractor to one side with the cross rod as the center axis, exposes the top of the pedicle screw, twists the screw cap back by using the original screw cap lifter, at this time, the cross rod of the extractor is firmly fixed on the pedicle screw by the screw cap. The screw cap lifter is pulled out, the extractor is turned back along the central axis of the cross rod, the central axis of the main rod of the extractor is in the same straight line with the central axis of the pedicle screw, the extractor is counterclockwise rotated, and the pedicle screw can be removed. The device designed by the application has wide applicability and is convenient to use.

Description

Technical Field

[0001] This invention belongs to the field of spinal surgical instruments, specifically relating to a general-purpose pedicle screw remover. Background Technology

[0002] Currently, rod-and-screw systems (pedicle screws, nuts, and connecting rods, with the nuts threaded onto the pedicle screws) are increasingly widely used in spinal surgery. Numerous manufacturers produce these systems, each with different screw design philosophies, and even within the same manufacturer, products undergo regular iterations. This presents challenges for the secondary removal of implants in clinical practice. While most rod-and-screw systems use similar drive systems (hexagonal or Torx), pedicle screws have a wider variety of drive systems. Furthermore, tracing the screw model used in the primary surgery is often difficult, leading to a lack of appropriate tools for screw removal during the procedure. This forces the use of more invasive and time-consuming unconventional methods, potentially causing secondary injury to the patient. For example, using forceps to clamp and rotate the screw can be problematic due to the significant force required and the difficulty in controlling the force. If the forceps slip and the force is not retracted in time, it can cause secondary damage to surrounding tissues. Additionally, the pedicle is relatively thin; applying force exceeding its tolerance can easily lead to bone fracture, complicating subsequent treatment.

[0003] Therefore, the current problem to be solved is to find a universal device that can effectively remove pedicle screws and prevent slippage during use. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention presents a general-purpose pedicle screw remover.

[0005] To achieve the above-mentioned technical objectives, the present invention is implemented through the following technical solution: a general-purpose pedicle screw remover, comprising: a handle, a main rod, and a remover head;

[0006] The handle is fixedly connected to the main rod;

[0007] The main rod connects the handle to the extractor head;

[0008] The front view of the extractor head is a square frame style with a hollow center;

[0009] Preferably, the cross-section of the upper side of the extractor head frame is a trapezoid with the shorter side facing downwards;

[0010] Preferably, the sides of the extractor head frame are rounded rectangular metal sheets;

[0011] Preferably, the lower side of the extractor head is a cylindrical crossbar, which is rotatably connected to the side of the extractor head frame;

[0012] Preferably, the handle has anti-slip stripes;

[0013] Preferably, the diameter of the cylindrical crossbar at the bottom of the extractor head is 5.5 mm;

[0014] Preferably, the width of the extractor head frame is 12 mm.

[0015] The beneficial effects of this invention are:

[0016] Using the above method, in the removal of the spinal screw-rod system, if a suitable tool is not available to match the drive system of the pedicle screw after the surgeon removes the nut and connecting rod, this tool can be used to remove the pedicle screw. The surgeon first uses a nut screwdriver to remove the nut, then places the crossbar of the extractor head inside the connecting head of the pedicle screw. The extractor is then rotated to one side with the crossbar as the center axis, exposing the top of the pedicle screw. The nut is then screwed back on using the original nut screwdriver. At this point, the crossbar of the extractor is firmly fixed to the pedicle screw by the nut. The nut screwdriver is pulled out, and the extractor is rotated back along the central axis of the crossbar, so that the central axis of the extractor's main rod is aligned with the central axis of the pedicle screw. The extractor is then rotated counterclockwise to remove the pedicle screw. The device designed in this invention has wide applicability and is easy to use. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a front structural diagram of the present invention;

[0019] Figure 2 This is a side view of the present invention;

[0020] Figure 3 This is a front view of the method of using the present invention;

[0021] Figure 4 This is a side view of the method of using the present invention;

[0022] The attached diagram lists the components represented by each number as follows:

[0023] 1-Handle, 2-Main rod, 3-Removal head, 301-Side, 302-Horizontal bar, 303-Upper edge of trapezoidal frame, 4-Pedicle screw, 5-Nut. Detailed Implementation

[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. 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.

[0025] Example 1

[0026] See Figures 1 to 4 As shown, a general-purpose pedicle screw remover includes: a handle 1, a main rod 2, and a remover head 3;

[0027] The handle 1 is fixedly connected to the main rod 2, making it easy for the operator to hold during use; the main rod 2 connects the handle 1 to the extractor head 3; the front view of the extractor head 3 is a square frame style with a hollow center, which provides space to connect the nut 5 to the pedicle screw 4;

[0028] Considering that the extractor needs to be tilted to make room in the middle for easy unscrewing and installation of the nut, the upper cross-section of the extractor head 3 frame is designed as a trapezoid 303 with the short side facing downwards. This allows the extractor head 3 to tilt at a smaller angle to make room for the threaded hole on the pedicle screw 4 for thread installation. At the same time, to reduce the volume of the extractor head 3, the side 301 of the extractor head 3 frame is a rounded rectangular metal sheet with a thickness of 1-3 mm. The specific thickness is determined by the strength of the metal material. This ensures that the extractor head 3 has sufficient strength while minimizing the width for ease of operation and to minimize the surgical exposure area. In addition, the lower part of the extractor head 3 is a cylindrical crossbar 302, which makes it easier to embed into the connector of the pedicle screw 4.

[0029] In addition, anti-slip stripes are provided on the handle 11 to facilitate operation.

[0030] Furthermore, the diameter of the cylindrical crossbar 302 at the bottom of the extractor head 3 is 5.5 mm, which matches the connector of most pedicle screws 4; the frame width of the extractor head 3 is 12 mm, which is larger than the top width of most pedicle screws 4 to ensure versatility.

[0031] The usage method based on this embodiment:

[0032] After exposing the pedicle screw 4 during the operation, first unscrew the nut 5 on the pedicle screw 4, then place the crossbar 302 on the extraction head 3 of this device into the connector of the pedicle screw 4. The crossbar 302 can rotate along its own central axis. Therefore, the extraction device is deflected to one side with the central axis of the crossbar 302 as the axis, exposing the top of the pedicle screw 4. Use the nut 5 screwdriver to unscrew the nut 5 back. At this time, the crossbar 302 of the extraction device is firmly fixed to the pedicle screw 4 by the nut 5. Then rotate the extraction device along the central axis of the crossbar 302 to restore the extraction device to the vertical position, that is, the central axis of the main rod 2 of the extraction device and the central axis of the pedicle screw 4 are in the same straight line. Then rotate the extraction device counterclockwise to remove the pedicle screw 4.

[0033] Example 2

[0034] Based on Example 1, in actual use, the crossbar 302 is embedded in the pedicle screw and is pressed by the nut above, causing the cylindrical crossbar 302 to be locked by pressure, making rotation difficult or even impossible. Therefore, the following improvements are made:

[0035] Furthermore, the crossbar 302 is rotatably connected to the side 301 of the extractor head frame. Specifically, the two ends of the crossbar 302 are embedded in the side 301. Alternatively, a rotatable outer shell can be fitted onto the outside of the crossbar 302, so that after the pedicle screw 4 is embedded in the crossbar 302, the device can be rotated along the central axis of the crossbar without being locked by the nut.

[0036] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0037] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A general-purpose pedicle screw remover, characterized in that, include: Handle, main rod, and extractor head; The handle is fixedly connected to the main rod; The main rod connects the handle to the extractor head; The front view of the extractor head is a square frame style with a hollow center; The upper cross-section of the extractor head frame is a trapezoid with the short side facing downwards; The sides of the extractor head frame are rounded rectangular metal sheets; The lower part of the extractor head is a cylindrical crossbar, which is rotatably connected to the side of the extractor head frame.

2. The general-purpose pedicle screw extractor according to claim 1, characterized in that, The handle has anti-slip stripes.

3. The general-purpose pedicle screw extractor according to claim 1, characterized in that, The diameter of the cylindrical crossbar at the bottom of the extractor head is 5.5 mm.

4. The general-purpose pedicle screw extractor according to claim 1, characterized in that, The width of the extractor head frame is 12 mm.

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