An angle-adjustable pedicle screw channel navigation device

Abstract

The utility model discloses a kind of angle-adjustable pedicle screw channel navigation devices, including guide rod;Sliding clamping part, sliding sleeve is set on the guide rod, it includes the sliding disc and the fixed clamp connected on the sliding disc with the rotating connection of the guide rod, the sliding disc circumferential surface is equipped with its locking element with the guide rod interlocking;Through the analysis of CT chart on CT coronal plane and sagittal plane, the inclination and head-tail inclination angle of the pedicle of the pedicle screw to be placed in the vertebral body are calculated, according to preoperative CT measurement pedicle angle, the best implantation path of intraoperative pedicle screw is planned, the accuracy of pedicle screw implantation is improved. It can increase surgical efficiency, greatly reduce the occurrence of surgical complications. Simple structure, parts can be detached, metal parts can be sterilized with other surgical instruments, easy to disinfect, light in weight, and easy to install and debug.

Description

Technical Field

[0001] This utility model belongs to the field of pedicle screw placement technology, specifically relating to an adjustable-angle pedicle screw channel navigation device. Background Technology

[0002] Pedicle screw fixation, based on the Roy-Camilo theory, plays a crucial role in reconstructing the spinal sequence and stabilizing the spine. It is considered one of the most common and effective internal fixation methods for spinal fixation. It achieves three-column fixation of the spine without damaging its structure, effectively treating various spinal diseases. Accurate screw placement during surgery is key to the success of this procedure and a necessary condition for achieving spinal stability and safety. The pedicles of the thoracic and lumbar vertebrae vary in size and shape, being irregular cylinders. Traditional pedicle screw placement techniques generally rely on the surgeon's experience and are performed manually, often requiring repeated adjustments to the screw angle and direction. The lack of a guiding navigation system makes it impossible to adjust, correct, or judge the medial and lateral tilt angles and the cephalocele angles of the screw placement. Utility Model Content

[0003] In order to solve the above-mentioned problems in the existing technology, the purpose of this utility model is to provide an adjustable-angle pedicle screw navigation device.

[0004] The technical solution adopted in this utility model includes:

[0005] Guide rod;

[0006] A sliding clamping member is slidably sleeved on the guide rod. It includes a sliding disk rotatably connected to the guide rod and a fixed clamp connected to the sliding disk. The circumferential surface of the sliding disk is provided with a locking member that locks with the guide rod.

[0007] An angle adjustment component is located on one side of the guide rod. It includes a hollow guide rod and a scale. The hollow guide rod is rotatably connected to the guide rod, and the scale is used to assist in measuring the rotation angle of the hollow guide rod.

[0008] As a preferred embodiment of this utility model, the sliding disk is fitted onto the guide rod through a through hole and can slide along its length. A reference line extending along its length is formed on the circumferential surface of the guide rod. A scale mark is formed on one end face of the sliding disk, and the reference line is used to assist in measuring the rotation angle of the sliding disk.

[0009] As a preferred embodiment of this utility model, a limiting stop is provided at one end of the guide rod near the sliding clamping member. The limiting stop is detachably installed with the guide rod and is used to restrict the sliding disc from sliding away from the guide rod.

[0010] As a preferred embodiment of this invention, an adjusting rod is fixedly provided at the end of the sliding disc away from the fixing clamp, and the fixing clamp and the sliding disc are fixedly connected by a connecting rod.

[0011] As a preferred embodiment of this utility model, the limiting stop has a threaded hole structure, and one end of the guide rod is threadedly connected to a threaded stop block.

[0012] As a preferred embodiment of this utility model, the limiting stop is a bendable stop cap, and one end of the bendable stop cap is fixedly connected to the guide rod.

[0013] As a preferred embodiment of this utility model, the guide rod is provided with an adjustment groove, and the hollow guide rod is rotatably connected to the adjustment groove by a locking bolt; the scale is a semi-circular scale, and it is fixedly connected to the tangent surface of the guide rod.

[0014] As a preferred embodiment of this utility model, an auxiliary plate is fixedly provided on the hollow guide rod, and one end of the auxiliary plate is attached to and close to the dial.

[0015] As a preferred embodiment of this utility model, the locking element is a threaded hole structure, and a locking bolt is fitted into the threaded hole.

[0016] The beneficial effects of this utility model are as follows:

[0017] This invention, as an adjustable-angle pedicle screw navigation device, calculates the pedicle tilt angles (inward / outward and cephalic / coccygeal) of the vertebral body to be screwed by analyzing CT images in coronal and sagittal planes. Based on the preoperative CT measurements of the pedicle angles, it plans the optimal insertion path for the pedicle screw during surgery, improving the accuracy of pedicle screw placement. This increases surgical efficiency and significantly reduces surgical complications. The device has a simple structure, detachable parts, and metal components can be sterilized together with other surgical instruments, making sterilization easy. It is lightweight and easy to install and adjust. Specifically, it utilizes sliding clamps at both ends of the guide rod for adjusting the inward / outward tilt angles and tilt adjustment components for adjusting the cephalic / coccygeal tilt angles. The angles and relative spacing of the sliding clamps and tilt adjustment components can be adjusted arbitrarily based on preoperative measurement data, ensuring that the hollow guide rod in the tilt adjustment component forms the optimal insertion path for the pedicle screw. Attached Figure Description

[0018] The present invention will now be described in further detail with reference to the accompanying drawings and specific implementation methods.

[0019] Figure 1 This is a schematic diagram of the structure of this utility model;

[0020] Figure 2 This is a schematic diagram of the structure of the sliding clamping component of this utility model;

[0021] Figure 3 This is a side view of the structure of this utility model;

[0022] Figure 4 This is a utility model Figure 3 Enlarged structural diagram at point A in the diagram;

[0023] Figure 5 This utility model relates to preoperative CT measurement and analysis. Figure 1 ;

[0024] Figure 6 This utility model relates to preoperative CT measurement and analysis. Figure 2 .

[0025] In the diagram: 1. Guide rod; 2. Sliding clamp; 3. Tilt adjustment component;

[0026] 11. Stop; 12. Baseline; 13. Adjustment groove;

[0027] 21. Sliding disc; 22. Adjusting rod; 23. Connecting rod; 24. Fixing clamp;

[0028] 211. Locking element; 212. Scale markings;

[0029] 31. Hollow guide rod; 32. Dial; 33. Auxiliary plate. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the present utility model and are not intended to limit the present utility model; that is, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The components of the embodiments of the present utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0031] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0032] The following is combined with Figure 1-3 This invention describes a specific embodiment of an adjustable-angle pedicle screw navigation device, comprising:

[0033] Guide rod 1;

[0034] The sliding clamp 2 is slidably sleeved on the guide rod 1. It includes a sliding disc 21 rotatably connected to the guide rod 1 and a fixing clamp 24 connected to the sliding disc 21. The circumferential surface of the sliding disc 21 is provided with a locking member 211 that locks with the guide rod 1. The sliding clamp 2 is used to fix between the upper and lower spinous processes of the vertebra to which the nail is to be placed. The fixing clamp 24 is connected to the sliding disc 21. The sliding disc 21 and the guide rod 1 can rotate relative to each other. The inward and outward tilt angle formed between the fixing clamp 24 and the guide rod 1 can be adjusted. After the rotation of the sliding disc 21 on the guide rod 1 is adjusted, the relative position of the two can be locked by the locking member 211 on the sliding disc 21 to achieve locking after the inward and outward tilt angle adjustment.

[0035] The tilt adjustment component 3, located on one side of the guide rod 1, includes a hollow guide rod 31 and a dial 32. The hollow guide rod 31 is rotatably connected to the guide rod 1. The dial 32 is used to assist in measuring the rotation angle of the hollow guide rod 31. The hollow guide rod 31 forms a path for the insertion of the pedicle screw. The inward and outward tilt angles of the hollow guide rod 31 are adjusted by the sliding clamp 2, and its head and tail tilt angles are adjusted by the tilt adjustment component 3. In the tilt adjustment component 3, the hollow guide rod 31 is rotatably connected to the guide rod 1. At the same time, the rotation angle of the hollow guide rod 31 can be observed through the dial 32. The angle can be positioned according to the preoperative measurement data so that the hollow guide rod 31 forms the optimal inward and outward tilt angles and head and tail tilt angles for the insertion of the pedicle screw.

[0036] In this embodiment, please refer to Figure 1 As shown, the sliding disk 21 is fitted onto the guide rod 1 through a through hole and can slide along its length. A reference line 12 extending along its length is formed on the circumference of the guide rod 1. A scale mark 212 is formed on one end face of the sliding disk 21. The reference line 12 is used to assist in measuring the rotation angle of the sliding disk 21. In the sliding clamp 2, the bottom is clamped between the upper and lower spinous processes of the nail vertebra by a fixing clamp 24. When it is necessary to adjust the tilt angle of the head and tail of the tilt adjustment component 3, the sliding disk 21 can be rotated along the guide rod 1. During the rotation, since the scale mark 212 is formed on the sliding disk 21 and the reference line 12 is formed on the guide rod 1 to assist in judging the rotation angle, the rotation angle of the sliding disk 21 on the guide rod 1 can be accurately judged and corrected.

[0037] Please refer to the example in this case. Figures 1-2As shown, a limiting stop 11 is provided at one end of the guide rod 1 near the sliding clamp 2. The limiting stop 11 is detachably installed with the guide rod 1 and is used to restrict the sliding disk 21 from sliding off the guide rod 1. The sliding clamp 2 uses the limiting stop 11 to limit the sliding disk 21, which is a detachable structure of the guide rod 1, to prevent the sliding disk 21 from sliding off the guide rod 1.

[0038] In some embodiments, please refer to Figure 2 As shown, an adjusting rod 22 is fixedly provided at one end of the sliding disk 21 away from the fixing clamp 24. The fixing clamp 24 and the sliding disk 21 are fixedly connected by a connecting rod 23. The adjusting rod 22 serves as a driving rod for adjusting the rotation of the sliding disk 21. One end of the adjusting rod 22 is fixedly connected to the upper tangent surface of the sliding disk 21. The fixing clamp 24 is located on the side of the sliding disk 21 relative to the adjusting rod 22.

[0039] In one embodiment of the limiting stop 11, please refer to Figures 1-2 As shown, the limiting stop 11 has a threaded hole structure. One end of the guide rod 1 is threadedly connected to a threaded stop block. A threaded hole is formed at one end of the guide rod 1, and a threaded stop block is threadedly fitted inside the threaded hole. The outer diameter of the threaded stop block is larger than the outer diameter of the guide rod 1, so as to limit the sliding of the sliding disk 21 from disengaging from the guide rod 1.

[0040] In another embodiment of the limit stop, please refer to Figures 1-2 As shown, the limiting stop 11 is a bendable stop cap, one end of which is fixedly connected to the guide rod 1. The bendable stop cap is made of bendable material and serves as a limiting member to prevent the sliding disk 21 from sliding out.

[0041] In this embodiment, please refer to Figure 2 As shown, the guide rod 1 has an adjustment groove 13. The hollow guide rod 31 is rotatably connected to the adjustment groove 13 by a locking bolt 311. It should be noted that the front end of the locking bolt has a thread that engages with the guide rod 1, and the rear end is a smooth axis surface that rotatably connects with the hollow guide rod 31. While realizing the rotatable connection between the hollow guide rod 31 and the guide rod 1, the position of the hollow guide rod 31 after angle adjustment relative to the guide rod 1 can be locked by the locking bolt 311 to avoid angle deviation during the insertion of the pedicle screw. The scale 32 is a semi-circular scale 32, which is fixedly connected to the tangential surface of the guide rod 1. By opening the adjustment groove 13 on the guide rod 1, the distance between the hollow guide rod 31 and the scale 32 can be reduced to facilitate the judgment of the rotation angle of the hollow guide rod 31.

[0042] In this preferred embodiment, as shown in the figure, an auxiliary plate 33 is fixedly provided on the hollow guide rod 31. One end of the auxiliary plate 33 is attached to and close to the scale 32. By fixing the auxiliary plate 33 on the circumferential surface of the hollow guide rod 31 close to the scale 32, and the auxiliary plate 33 is close to the scale mark 212 surface of the scale 32, it is convenient to judge the rotation angle of the hollow guide rod 31.

[0043] Please refer to Figures 1-2 As shown, the locking member 211 has a threaded hole structure, and a locking bolt is threaded into the threaded hole. The threaded hole is formed on the sliding disc 21, and the bolt is threaded into the threaded hole. The bolt is pushed into the threaded hole, so that one end is screwed to abut against the guide rod 1, thereby achieving locking after the guide rod 1 and the sliding disc 21 are directly adjusted in position.

[0044] It should be noted that the fixing clip 24 is a conventional technology and can be a manual threaded rotating clip or other press-type clip. It is only necessary to be able to clamp between the upper and lower spinous processes of the vertebral body with the nail and to ensure that it is medically usable. In this embodiment, the fixing clip 24 is preferably a threaded rotating adjustable clip, which is made of metal and can achieve its reusability and adjustability of the clamping force between the upper and lower spinous processes of the vertebral body with the nail.

[0045] Working principle of this utility model:

[0046] Preoperative measurements were taken to determine the optimal angle and placement of the pedicle screws.

[0047] Select the section with the largest pedicle diameter from the axial image of the vertebral body where the screw was placed, such as... Figure 5 The four longitudinal lines are parallel to the longitudinal axis of the vertebral body axial image. These parallel lines are placed at the inner and outer edges of the pedicles to obtain the projection range of the pedicles on the lamina and articular processes. The intersections of the two outer parallel lines with the articular processes are the entry points for the percutaneous screws. Line a is the bisector of the anteroposterior direction of the bilateral pedicles, located at the point of maximum pedicle diameter, bisecting the spinal canal anteriorly and posteriorly. The optimal screw entry direction is the line connecting entry points b and c with the midpoint of the segment of line a intercepted from the pedicle projection line; the accurate E-angle can be measured using the imaging system.

[0048] Draw tangent lines d and e from the pedicle screw entry points b and c on the lateral wall of the pedicle and the lateral wall of the spinal canal on the respective sides. The area between the intersection of these two lines at the edge of the vertebral body is the safe zone for screw placement. Figure 6 This area clearly defines the range of the E-angle of the screw that can be inserted through the entry point. If the E-angle is smaller than this range, the screw will penetrate the outer wall of the pedicle, damaging paravertebral tissues or blood vessels. If the E-angle exceeds this range, the screw will enter the spinal canal, injuring the spinal cord or nerve roots. Simultaneously, lines d and e represent the maximum length of the screw that can be inserted (laterally and medially) through the entry point; if the screw exceeds this length, it may penetrate the cortex, injuring abdominal organs and blood vessels.

[0049] Based on the above measurement data, navigation was used to determine the placement position and angle of the pedicle screw.

[0050] First, the fixing clamp 24 clamps the upper and lower spinous processes of the vertebral body, and the distance between the sliding clamp 2 and the tilt adjustment component 3 is adjusted according to the measured spacing of the two pedicle screws. Based on the measured angle E, the sliding disc 21 is rotated on the guide rod 1 by hand-held adjustment rod 22. The rotation angle of the sliding disc 21 can be controlled by the scale mark 212 and the baseline 12. Based on the safe area for screw placement, the placement position of the pedicle screw can be adjusted by rotating the hollow guide rod 31. The rotation angle of the hollow guide rod 31 can be assisted by the scale 32. After the hollow guide rod 31 is positioned, it is locked by the locking bolt 311 on the hollow guide rod 31 to fix the pedicle screw placement path and form a channel path for pedicle screw placement inside the hollow guide rod 31, so as to assist the surgeon in placing the pedicle screw into the vertebra. After the pedicle screw is placed, the device is removed.

[0051] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," etc., 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 utility model based on the specific circumstances.

[0052] The above description is merely an example and illustration of the structure of this utility model. Those skilled in the art can make various modifications or additions to the specific embodiments described or use similar methods to replace them, as long as they do not deviate from the structure of the utility model or exceed the scope defined in the claims, they should all fall within the protection scope of this utility model.

Claims

1. An adjustable-angle pedicle screw track navigation device, characterized in that, include: Guide rod (1); The sliding clamp (2) is slidably sleeved on the guide rod (1). It includes a sliding disc (21) rotatably connected to the guide rod (1) and a fixed clamp (24) connected to the sliding disc (21). The circumferential surface of the sliding disc (21) is provided with a locking member (211) that locks it to the guide rod (1). An angle adjustment component (3) is located on one side of the guide rod (1). It includes a hollow guide rod (31) and a dial (32). The hollow guide rod (31) is rotatably connected to the guide rod (1). The dial (32) is used to assist in measuring the rotation angle of the hollow guide rod (31).

2. The adjustable-angle pedicle screw navigation device according to claim 1, characterized in that: The sliding disk (21) is fitted onto the guide rod (1) through a through hole and can slide along its length. A reference line (12) extending along its length is formed on the circumferential surface of the guide rod (1). A scale mark (212) is formed on one end face of the sliding disk (21), and the reference line (12) is used to assist in measuring the rotation angle of the sliding disk (21).

3. The adjustable-angle pedicle screw navigation device according to claim 2, characterized in that: The guide rod (1) has a limiting stop (11) at one end near the sliding clamp (2). The limiting stop (11) is detachably installed with the guide rod (1) and is used to restrict the sliding disk (21) from sliding away from the guide rod (1).

4. The adjustable-angle pedicle screw navigation device according to claim 3, characterized in that: An adjusting rod (22) is fixedly provided at one end of the sliding disc (21) away from the fixing clamp (24), and the fixing clamp (24) and the sliding disc (21) are fixedly connected by a connecting rod (23).

5. The adjustable-angle pedicle screw navigation device according to claim 3, characterized in that: The limiting stop (11) has a threaded hole structure, and one end of the guide rod (1) is threadedly connected to a threaded stop block.

6. The adjustable-angle pedicle screw navigation device according to claim 3, characterized in that: The limiting stop (11) is a bendable stop cap, and one end of the bendable stop cap is fixedly connected to the guide rod (1).

7. The adjustable-angle pedicle screw navigation device according to claim 1, characterized in that: An adjustment groove (13) is provided on the guide rod (1), and the hollow guide rod (31) is rotatably connected in the adjustment groove (13) by a locking bolt (311); the scale (32) is a semi-circular scale (32), and it is fixedly connected to the tangent surface of the guide rod (1).

8. The adjustable-angle pedicle screw navigation device according to claim 5, characterized in that: An auxiliary plate (33) is fixedly provided on the hollow guide rod (31), and one end of the auxiliary plate (33) is attached to and close to the dial (32).

9. The adjustable-angle pedicle screw navigation device according to claim 1, characterized in that: The locking element (211) has a threaded hole structure, and a locking bolt is fitted inside the threaded hole.

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