Nail placing device
By using a nail placement device with a bent tube structure in the skull base depression surgery, the problem of tooth blocking caused the screw to not enter the nail correctly, and the accuracy of the screw nail entry angle and the treatment effect are improved.
Patent Information
- Application Number
- CN202421383228.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-17
- Publication Date
- 2025-05-27
- Estimated Expiration
- 2034-06-17
AI Technical Summary
During the skull base depression surgery, due to tooth obstruction, the screws cannot be inserted into the nail correctly, which affects the treatment effect.
A nail placement device is adopted, which includes a rigid bend, a screw connector, a rotating handle and a torque transmission shaft. The arc of the rigid bend avoids the interference position of the teeth, and ensures the accuracy of the screw entry angle through the torque transmission shaft.
It ensures the accuracy and ideality of the screw insertion angle, avoids loose or damaged teeth, ensures sufficient nailing length and bone support, and improves the therapeutic effect.
Smart Images
Figure CN222899268U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of medical devices, and more specifically, to a nail placement device. Background Art
[0002] Basilar invagination is a syndrome characterized by a series of clinical symptoms of spinal nerve compression caused by various primary or secondary lesions or deformities in the junction area of the skull base and cervical spine, which causes the upper structure of the cervical spine to move upward and sink into the foramen magnum, compressing the brainstem and medulla oblongata, and may be combined with neural structural deformities. These deformities can be seen in 30% of patients with basilar invagination. The commonly used treatment method for basilar invagination is to release the atlantoaxial joint through the oropharynx, reduce the joint, remove the articular cartilage, implant the autologous iliac bone block or particles of appropriate size, and finally perform atlantoaxial anterior plate (TARP plate) internal fixation, so as to achieve release, reduction, fixation, and fusion in one step, and obtain good clinical results.
[0003] During the transoral release and atlantoaxial joint reduction technique, screws need to be implanted in the atlas and axis respectively for temporary fixation or fixation of the TARP plate. During the process of inserting the screws into the atlas or axis, the position of the screw insertion point is not good or the screw insertion angle deviates. Due to the difference in structural thickness of the atlas and axis, the screws can easily penetrate the outer wall of the atlas and axis and cause damage to other parts. Therefore, after determining the insertion point, the screw insertion angle must also be strictly controlled.
[0004] During the current skull base depression surgery, the patient is in a supine position with the back raised, the cervical spine extremely tilted back and weight traction applied to the skull, so that the patient maintains a position with the mouth open upward. However, due to physiological structure limitations, the surgical window of some severe skull base depressions will be blocked by the patient's teeth, resulting in difficulty in screw placement. This requires an orthopedic screwdriver to tighten the screws during instrument screw placement. The orthopedic screwdriver and the screw are inserted in a straight line, and the bone surface for screw insertion is blocked by the teeth in the mouth, resulting in the doctor needing to tap and insert the screw at a certain angle. This will prevent the screw from being inserted perpendicular to the bone surface, leaving a certain angle. When the screw placement angle is difficult, it is difficult to insert the screw normally, or even if the screw is inserted with difficulty, the screw length is insufficient or there is not enough bone around the axis vertebra, resulting in insufficient screw holding force, affecting the treatment effect. Utility Model Content
[0005] The purpose of the present utility model is to overcome the deficiency that during the operation for treating basilar invagination, when placing screws through the oropharynx, the placement of the screws is blocked by the teeth, resulting in incorrect screw insertion and affecting the treatment effect. A screw placement device is provided. When the present utility model fixes the screw, it can ensure the accuracy and ideality of the screw insertion angle, is not affected by tooth occlusion, avoids tooth loosening or damage that may be caused by forced screw insertion, and can ensure a sufficient screw insertion length. There is sufficient bone mass around the screw to ensure the stability of the screw and improve the treatment effect.
[0006] To solve the above technical problems, the technical solution adopted by the present utility model is:
[0007] A screw placement device includes a rigid bent pipe, a screw connecting head, a rotating handle, and a torque transmission shaft. The torque transmission shaft is movably inserted through the rigid bent pipe. The two ends of the torque transmission shaft are respectively fixedly connected to the screw connecting head and the rotating handle. Rotating the rotating handle can transmit the torque to the screw connecting head through the torque transmission shaft. The rigid bent pipe includes an arc-shaped pipe section and two straight pipe sections respectively communicating with the two ends of the arc-shaped pipe section. The axes of the two straight pipe sections are parallel to each other.
[0008] It should be noted that during the current operation for basilar invagination, the patient is in the supine position, the back is elevated, the cervical vertebra is extremely hyperextended and a weight traction is applied to the skull, so that the patient maintains a position with the mouth open upward. However, due to physiological structure limitations, the surgical window of basilar invagination will inevitably be partially blocked by the patient's oral teeth. This makes it impossible to directly insert the orthopedic screwdriver and screw during the instrument screw placement, and the bone surface for screw insertion is blocked by the oral teeth. The present utility model uses the curvature of the rigid bent pipe to avoid the interference position of the teeth, and uses the torque transmission shaft to transmit the rotational torque from the rotating handle to the screw connecting head. In this way, when fixing the screw, the accuracy of the screw insertion angle can be ensured. Moreover, during the tapping process, since the rigid bent pipe avoids the interference of the teeth, the straight pipe section can maintain the same correct screw insertion angle as the screw. Therefore, the screw can be tapped and inserted without deviation according to the designed angle, and the angle deviation during the insertion process will not be caused by tooth interference. In this way, the fixing effect is stable, the accuracy and ideality of the screw insertion angle can be ensured, it is not affected by tooth occlusion, tooth loosening or damage that may be caused by forced screw insertion can be avoided, and a sufficient screw insertion length can be ensured. There is sufficient bone mass around the screw to ensure the stability of the screw and improve the treatment effect.
[0009] Furthermore, the torque transmission shaft includes a flexible shaft and two rigid shafts fixedly connected to the two ends of the flexible shaft. The two rigid shafts are respectively located in the two straight pipe sections, the flexible shaft is located in the arc-shaped pipe section, and the two rigid shafts are respectively fixedly connected to the screw connecting head and the rotating handle.
[0010] The torque transmission of the present utility model is based on the transmission of a flexible shaft and a rigid shaft. The flexible shaft can be deformed and is located in the arc-shaped pipe section. With the design of the avoidance space of the rigid elbow pipe, the structure is simple and effective. In addition, rigid shafts are provided at both ends of the flexible shaft because the flexible shaft is restricted by the shape of the arc-shaped pipe section, and the direction of its torque changes by a certain angle at each position. The rigid shaft at the rotating handle can better transmit the torque in the axial direction to the flexible shaft, while the rigid shaft connecting the screw connecting head is used to correct the direction of the torque transmitted by the flexible shaft to rotate in the direction around the axis of the rigid shaft. At the same time, the rigid shaft cooperates with the straight pipe section to limit the output direction of the torque, so as to ensure that the torque transmitted to the screw can be better used for tapping.
[0011] Further, the flexible shaft is a flexible shaft formed by winding a single-strand wire into a spiral shape.
[0012] Further, the flexible shaft is a flexible shaft formed by stranding multiple strands of wire.
[0013] It should be noted that the flexible shaft needs to be able to transmit torque and have a certain strength. Therefore, it can be made of a metal material with a certain strength and elastic deformation performance. The implementation methods include, but are not limited to, being wound or stranded by single-strand or multi-strand steel.
[0014] Further, the angle range of the central angle α corresponding to the arc-shaped pipe section is 90° ≤ α ≤ 180°. The arc corresponding to the central angle of 90° ≤ α ≤ 180° has a gentler radian, so that the flexible shaft is more smooth during torque transmission. This radian range can not only ensure the effectiveness of torque transmission but also ensure the avoidance space for avoiding tooth interference.
[0015] Further, a transition chamfer is provided at the connection between the arc end and the two straight pipe sections. The setting of the transition chamfer improves the smoothness and stability of torque transmission and also makes it easier for the operator.
[0016] Further, the screw connecting head includes a screwdriver head connected to one of the rigid shafts, and the screwdriver head extends out of the straight pipe section.
[0017] Further, the end shape of the screwdriver head is in interference fit with the shape of the slot or notch of the screw. The interference fit setting enables the screwdriver head to be clamped with the screw to form a temporary connection. In this way, during the screw placement process, the screw can be fixed on the screwdriver head in advance, and the screw is sent to the specified screw placement position by the screw placement device. After adjusting the angle, tapping and tightening can be directly carried out. After the fixation is completed, a little external force can be applied to separate the screw and the screwdriver head to achieve their separation and complete the screw placement.
[0018] Further, the rotating handle is a T-shaped handle, and one end of the rotating handle is fixedly connected to one of the rigid shafts.
[0019] Furthermore, an anti-slip pad is embedded in the T-shaped handle, and a number of protrusions are provided on the anti-slip pad.
[0020] Since a flexible shaft is used for torque transmission, more force needs to be applied compared to traditional rigid straight rods. To apply force better, a T-shaped handle is used for better gripping and force application, facilitating the operator to output high torque. At the same time, an anti-slip pad is provided to prevent slipping, improving the force transmission efficiency and reducing the risk of the handle slipping off.
[0021] Compared with the prior art, the beneficial effects of the present utility model are as follows:
[0022] The present utility model uses the curvature of the rigid bent pipe to avoid the interference position of the teeth, and uses the torque transmission shaft to transmit the rotational torque from the rotating handle to the screw connecting head. In this way, when fixing the screw, the accuracy of the screw insertion angle can be ensured. During the tapping process, since the rigid bent pipe avoids the interference of the teeth, the straight pipe section can maintain the same correct insertion angle as the screw. Therefore, the screw can be tapped and inserted without deviation according to the designed angle, without the angle deviation during the insertion process caused by tooth interference. In this way, the fixing effect is stable, the accuracy and ideality of the insertion angle can be ensured, not affected by tooth occlusion, avoiding the possible loosening or damage of teeth caused by forced nail insertion, and ensuring sufficient nail insertion length, with enough bone mass around the screw to ensure the stability of the screw and improve the treatment effect. BRIEF DESCRIPTION OF THE DRAWINGS
[0023] Figure 1 is a structural schematic diagram of the present utility model;
[0024] Figure 2 is a structural schematic diagram of the rigid bent pipe in the present utility model;
[0025] Figure 3 is a structural schematic diagram of the torque transmission shaft in the present utility model;
[0026] Figure 4 is an application schematic diagram of the present utility model.
[0027] The illustration marks are explained as follows:
[0028] 1 - rigid bent pipe, 11 - arc pipe section, 12 - straight pipe section, 2 - screw connecting head, 3 - rotating handle, 4 - torque transmission shaft, 41 - flexible shaft, 42 - rigid shaft, 100 - screw. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0029] The following further describes the present utility model in conjunction with specific embodiments. Among them, the attached drawings are only for illustrative purposes, showing only schematic diagrams rather than physical diagrams, and should not be construed as a limitation to this patent; in order to better illustrate the embodiments of the present utility model, some components in the attached drawings will be omitted, enlarged or reduced, which does not represent the dimensions of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the attached drawings may be omitted.
[0030] In the attached drawings of the embodiments of the present utility model, the same or similar reference numerals correspond to the same or similar components; in the description of the present utility model, it should be understood that if there are terms such as "upper", "lower", "left", "right", etc. indicating the orientation or positional relationship, it is based on the orientation or positional relationship shown in the attached drawings, and it is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the positional relationship in the attached drawings are only for illustrative purposes and should not be construed as a limitation to this patent. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.
[0031] Embodiment 1
[0032] As Figure 1 and Figure 2 shown, a nail-setting device includes a rigid bent pipe 1, a screw connector 2, a rotating handle 3 and a torque transmission shaft 4. The torque transmission shaft 4 is movably inserted into the rigid bent pipe 1, and both ends of the torque transmission shaft 4 are fixedly connected to the screw connector 2 and the rotating handle 3 respectively. Rotating the rotating handle 3 can transmit the torque to the screw connector 2 through the torque transmission shaft 4; the rigid bent pipe 1 includes an arc-shaped pipe section 11 and two straight pipe sections 12 respectively communicating with both ends of the arc-shaped pipe section 11, and the axes of the two straight pipe sections 12 are parallel to each other.
[0033] As Figure 1 and Figure 4As shown, since the orthopedic screwdriver and the screw 100 are inserted in a straight line, and the bone surface for screw insertion is blocked by the oral teeth, in this embodiment, the curvature of the rigid bent pipe 1 is used to avoid the interference position of the teeth. The rotational torque is transmitted from the rotating handle 3 to the screw connector 2 through the torque transmission shaft 4. In this way, when fixing the screw 100, the accuracy of the screw insertion angle of the screw 100 can be ensured. Moreover, during the tapping process, since the rigid bent pipe 1 avoids the interference of the teeth, the straight pipe section 12 can maintain the correct screw insertion angle consistent with the screw 100. Therefore, the screw 100 can be tapped and inserted according to the designed angle without deviation, and the angle deviation during the insertion process will not be caused by tooth interference. In this way, the fixing effect is stable, the accuracy and ideality of the screw insertion angle can be ensured, it is not affected by tooth occlusion, the loosening or damage of teeth caused by forced screw insertion can be avoided, and a sufficient screw insertion length can be ensured. There is enough bone mass around the screw to ensure the stability of the screw and improve the treatment effect.
[0034] As Figure 3 shown, the torque transmission shaft 4 includes a flexible shaft 41 and two rigid shafts 42 fixedly connected to both ends of the flexible shaft 41. The two rigid shafts 42 are respectively located in the two straight pipe sections 12, the flexible shaft 41 is located in the arc-shaped pipe section 11, and the two rigid shafts 42 are respectively fixedly connected to the screw connector 2 and the rotating handle 3.
[0035] The torque transmission of this embodiment is based on the transmission of the flexible shaft 41 and the rigid shaft 42. The flexible shaft 41 is deformable and located in the arc-shaped pipe section 11, which is matched with the design of the avoidance space of the rigid bent pipe 1, and the structure is simple and effective. In addition, rigid shafts 42 are provided at both ends of the flexible shaft 41 because the flexible shaft 41 is restricted by the shape of the arc-shaped pipe section 11, and the direction of its torque changes at a certain angle at each position. The rigid shaft 42 at the rotating handle 3 better transmits the torque in the axial direction to the flexible shaft 41, while the rigid shaft 42 connecting the screw connector 2 is used to correct the direction of the torque transmitted by the flexible shaft 41 to rotate in the axial direction around the rigid shaft 42. At the same time, the rigid shaft 42 cooperates with the straight pipe section 12 to limit the output direction of the torque, so as to ensure that the torque transmitted to the screw 100 can be better tapped.
[0036] In this embodiment, the flexible shaft 41 is a flexible shaft 41 formed by winding a single-strand wire into a spiral shape.
[0037] It should be noted that the flexible shaft 41 needs to be able to transmit torque and have a certain strength. Therefore, it can be made by winding a single strand of steel with a certain strength and elastic deformation performance into a spiral shape.
[0038] In this embodiment, the central angle α of the arc-shaped tube section 11 is 135°. The arc corresponding to the central angle of 135° has a gentler curvature, so that the flexible shaft 41 is smoother when transmitting torque. This curvature range can ensure the effectiveness of torque transmission and the avoidance space to avoid tooth interference.
[0039] like Figure 2 As shown, a transition chamfer is provided at the connection between the arc end and the two straight pipe sections 12. The transition chamfer is provided to improve the smoothness and stability of torque transmission and also save the operator more effort.
[0040] like Figure 1 and Figure 4 As shown, the screw connection head 2 includes a screwdriver head connected to one of the rigid shafts 42 , and the screwdriver head extends out of the straight pipe section 12 .
[0041] In this embodiment, the shape of the end of the screwdriver head is interference fit with the shape of the slot or notch of the screw 100. The interference fit allows the screwdriver head to be snap-fitted with the screw 100 to form a temporary connection, so that during the nail placement process, the screw 100 can be fixed on the screwdriver head in advance, and the screw 100 can be sent to the designated nail placement position using the nail placement device. After adjusting the angle, the screw is directly tapped and tightened. After the fixation is completed, a slight external force can be applied to separate the screw 100 and the screwdriver head, so that the two can be separated and the nail placement is completed.
[0042] Example 2
[0043] This embodiment is similar to Embodiment 1, except that
[0044] In this embodiment, the flexible shaft 41 is a flexible shaft 41 formed by twisting multiple strands of wire.
[0045] It should be noted that the flexible shaft 41 needs to be able to transmit torque and have a certain strength, so it can be made by twisting multiple strands of steel with a certain strength and elastic deformation performance.
[0046] The advantages of this embodiment are as follows: In this embodiment, the curvature of the rigid bent pipe 1 is used to avoid the interference position of the teeth, and the torque transmission shaft 4 is used to transmit the rotational torque from the rotating handle 3 to the screw connector 2. In this way, when fixing the screw 100, the accuracy of the screw 100's entering angle can be ensured. Moreover, during the tapping process, since the rigid bent pipe 1 avoids the interference of the teeth, the straight pipe section 12 can maintain the same correct entering angle as the screw 100. Therefore, the screw 100 can tap and enter the screw in accordance with the designed angle without deviation, and will not cause an angle deviation during the entering process due to tooth interference. In this way, the fixing effect is stable, the accuracy and ideality of the entering angle can be ensured, it is not affected by tooth occlusion, the risk of tooth loosening or damage caused by forced screw placement can be avoided, and a sufficient screw placement length can be ensured. There is enough bone mass around the screw to ensure the stability of the screw and improve the treatment effect.
[0047] The other structures and principles of this embodiment are the same as those of Embodiment 1.
[0048] Embodiment 3
[0049] This embodiment is similar to Embodiment 1, and the difference lies in that in this embodiment:
[0050] As Figure 2 shown, the rotating handle 3 is a T-shaped handle, and one end of the rotating handle 3 is fixedly connected to one of the rigid shafts 42.
[0051] In this embodiment, an anti-slip pad is also embedded on the T-shaped handle, and a number of protrusions are provided on the anti-slip pad.
[0052] Since the flexible shaft 41 is used for torque transmission, more force needs to be applied compared to a traditional rigid straight rod. For better force application, the T-shaped handle is better for gripping and applying force, facilitating the operator to output a large torque. At the same time, an anti-slip pad is set for anti-slip, improving the force transmission efficiency and reducing the risk of the handle slipping off.
[0053] The advantages of this embodiment are as follows: In this embodiment, the curvature of the rigid bent pipe 1 is used to avoid the interference position of the teeth, and the torque transmission shaft 4 is used to transmit the rotational torque from the rotating handle 3 to the screw connector 2. In this way, when fixing the screw 100, the accuracy of the screw 100's entering angle can be ensured. Moreover, during the tapping process, since the rigid bent pipe 1 avoids the interference of the teeth, the straight pipe section 12 can maintain the same correct entering angle as the screw 100. Therefore, the screw 100 can tap and enter the screw in accordance with the designed angle without deviation, and will not cause an angle deviation during the entering process due to tooth interference. In this way, the fixing effect is stable, the accuracy and ideality of the entering angle can be ensured, it is not affected by tooth occlusion, the risk of tooth loosening or damage caused by forced screw placement can be avoided, and a sufficient screw placement length can be ensured. There is enough bone mass around the screw to ensure the stability of the screw and improve the treatment effect.
[0054] The other structures and principles of this embodiment are the same as those of Embodiment 1.
[0055] Obviously, the above embodiments of the present utility model are merely examples given to clearly illustrate the present utility model, rather than limitations on the implementation manners of the present utility model. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the claims of the present utility model.
Claims
1. A nail placement device, characterized in that: The invention comprises a rigid bent pipe (1), a screw connection head (2), a rotating handle (3) and a torque transmission shaft (4); the torque transmission shaft (4) is movably arranged in the rigid bent pipe (1); two ends of the torque transmission shaft (4) are respectively fixedly connected to the screw connection head (2) and the rotating handle (3); the rotating handle (3) can be rotated to transmit torque to the screw connection head (2) through the torque transmission shaft (4); the rigid bent pipe (1) comprises an arc-shaped pipe section (11) and two straight pipe sections (12) respectively connected to the two ends of the arc-shaped pipe section (11); the axes of the two straight pipe sections (12) are parallel to each other.
2. A nail placement device according to claim 1, characterized in that: The torque transmission shaft (4) comprises a flexible shaft (41), and two rigid shafts (42) fixedly connected to both ends of the flexible shaft (41), the two rigid shafts (42) being respectively located in the two straight pipe sections (12), the flexible shaft (41) being located in the arc-shaped pipe section (11), and the two rigid shafts (42) being respectively fixedly connected to the screw connector (2) and the rotating handle (3).
3. A nail placement device according to claim 2, characterized in that: The flexible shaft (41) is a flexible shaft (41) formed by winding a single strand of wire into a spiral shape.
4. A nail placement device according to claim 2, characterized in that: The flexible shaft (41) is a flexible shaft (41) made by twisting a plurality of wire strands.
5. A nail placement device according to claim 1, characterized in that: The central angle α corresponding to the arc-shaped pipe segment (11) has an angle range of 90°≤α≤180°.
6. A nail placement device according to claim 1, characterized in that: A transition chamfer is provided at the connection between the arc-shaped pipe section (11) and the two straight pipe sections (12).
7. A nail placement device according to claim 1, characterized in that: The screw connector (2) comprises a screwdriver head connected to one of the rigid shafts (42), the screwdriver head extending out of the straight pipe section (12).
8. A nail placement device according to claim 7, characterized in that: The shape of the end of the screwdriver head is interference-fitted with the shape of the slot or recess of the screw (100).
9. The nail placement device according to claim 1, characterized in that: The rotating handle (3) is a T-shaped handle, and one end of the rotating handle (3) is fixedly connected to one of the rigid shafts (42).
10. A nail placement device according to claim 9, characterized in that: An anti-skid pad is also embedded on the T-shaped handle, and a plurality of protrusions are arranged on the anti-skid pad.