Long-arm hollow pedicle screw

Abstract

The utility model relates to the technical field of medical instruments, in particular to a long-arm hollow pedicle screw which comprises a hollow implanting portion, a long-arm fixing portion and a long-arm fixing portion. The long-arm nail arm part is connected with the implanting part; the end, close to the implanting part, of the nail arm part is provided with a breaking groove perpendicular to the implanting direction of the implanting part. An annular pipe coaxial with the nail arm part is arranged on one end face, far away from the implanting part, of the nail arm part, and an annular groove is formed in the joint of the annular pipe and the nail arm part. The long-arm hollow pedicle screw not only has the function of lifting and resetting the vertebral body, but also has the effect of simplifying the broken screw arm.

Description

Technical Field

[0001] The utility model relates to the technical field of medical instruments, in particular to a long-arm hollow pedicle screw used for spinal correction and internal fixation. Background Art

[0002] Percutaneous spinal pedicle screw fixation is an advanced surgical method for treating spinal diseases such as thoracolumbar fractures, lumbar spondylolisthesis, and instability in the world. With the help of an image navigation system, the operation guides the percutaneous precise implantation of pedicle screws without destroying the normal anatomical structure of the spine, reducing the occurrence of iatrogenic adjacent segment instability. The operation belongs to minimally invasive technology, with small intraoperative incisions, less traumatic bleeding, fast postoperative recovery of patients, and early ambulation, which provides favorable conditions for functional exercise. At present, the long-arm pedicle screws used in minimally invasive spinal surgery are provided with a reinforcement sheet at the tail to prevent deformation and breakage of the extended arm. For example, a minimally invasive spinal screw disclosed in announcement number CN209136829U, because the reinforcing piece is first broken at the end stage of the spinal screw implantation operation, and then the two extension arms of the nail arm are broken separately, the breaking action is cumbersome. For example, the sacral wing-iliac screw disclosed in announcement number CN212281580U also has the same problems as above. Summary of the invention

[0003] In view of the above-mentioned technical problems, the utility model provides a long-arm hollow pedicle screw, which has the effect of simplifying the breaking of the screw arm.

[0004] In order to solve the above technical problems, the technical solution provided by the utility model is:

[0005] A long-arm hollow pedicle screw comprises: a hollow implanting part for implanting into the pedicle; a long-arm nail arm part axially connected to the implanting part; the nail arm part having a breaking groove perpendicular to the axis of the implanting part near the end of the implanting part; and an annular tube coaxial with the nail arm part and integrally formed on an end face of the nail arm part away from the implanting part.

[0006] Preferably, the annular tube has a regular hexagonal shape.

[0007] Preferably, an annular groove is formed at the connection between the annular tube and the nail arm portion.

[0008] The utility model has the following beneficial effects: an annular tube is arranged on the nail arm of the pedicle screw, which can prevent the nail arm from being deformed and facilitate the breaking tool to break the two extended arms at one time. The annular tube of the pedicle screw has a simple structure and is easy to process. An annular groove is arranged between the annular tube and the nail arm, and after the pedicle screw is implanted in the vertebra, the lifting tool is connected to the pedicle screw through the annular groove to lift and reset the vertebra. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 A schematic diagram of the structure of the long-arm hollow pedicle screw provided in this embodiment;

[0010] Figure 2 An axial cross-sectional view of the long-arm hollow pedicle screw provided in this embodiment;

[0011] Figure 3 It is a schematic structural diagram of the nail arm portion of the long-arm hollow pedicle nail provided in this embodiment.

[0012] In the figure, 10 is a long-arm hollow pedicle screw, 11 is an implantation part, 12 is a screw arm part, 13 is an annular tube, 14 is a breaking groove, 15 is an annular groove, 16 is an internal thread, 121 is a first extension arm, and 122 is a second extension arm. DETAILED DESCRIPTION

[0013] In order to make the purpose, technical solution and advantages of the utility model more clear, the long-arm hollow pedicle screw of the utility model is further described in detail below through embodiments and in combination with the accompanying drawings. It should be understood that the specific embodiments described here are only for explanation and are not intended to limit the utility model.

[0014] The long arm hollow pedicle screw 10 is usually used in conjunction with a screwing device. The long arm hollow pedicle screw 10 is screwed into the spinal pedicle that needs to be fixed under the action of the screwing device, and then a connecting rod is inserted into the long arm hollow pedicle screw 10 to make a plurality of long arm hollow pedicle screws 10 become a whole.

[0015] like Figure 1-2 As shown, a long-arm hollow pedicle screw 10 includes a hollow implantation portion 11 for implantation at a vertebral pedicle, a long-arm-shaped nail arm portion 12 axially connected to the implantation portion 11, and an annular tube 13 coaxial with the nail arm portion 12, wherein the annular tube 13 is arranged on an end face of the nail arm portion 12 away from the implantation portion 11; the nail arm portion 12 and the annular tube 13 are integrally formed, and the annular tube 13 has a simple structure and is easy to process. A breaking groove 14 perpendicular to the axis of the implantation portion 11 is provided on the nail arm portion 12 near the end of the implantation portion 11, and the axial direction of the implantation portion 11 is the axial direction of the long-arm hollow pedicle screw 10 being screwed in. The long-arm hollow pedicle screw 10 is made of hard metal material, such as titanium alloy or stainless steel. The annular tube 13 is in the shape of a regular polygon, preferably a regular hexagon.

[0016] The connection between the implant part 11 and the nail arm part 12 can be a fixed connection, or the nail arm part 12 can be rotatably connected relative to the implant part 11. The implant part 11 is provided with an external thread that can be screwed into the vertebra so as to be fixedly connected to the vertebra. An internal thread 16 is provided on the inner wall of the nail arm part 12 near the implant part 11 end. The hollow cavity of the implant part 11 is connected to the inner cavity of the nail arm part 12, and is used to be inserted on the guide pin to have a guiding effect.

[0017] It is understandable that the length of the injured spine of the human body is different, so increasing the extension size of the nail arm portion 12 within a certain range can expand the applicable scope of the long-arm hollow pedicle screw 10, which has practical significance. The nail arm portion 12 of the long-arm hollow pedicle screw 10 needs to be as long as possible, but the longer the nail arm portion 12 is, the easier it is to deform during transportation and implantation.

[0018] like Figure 3 As shown, the nail arm portion 12 further includes a first extension arm 121 and a second extension arm 122 opposite to each other, and the two ends of the first extension arm 121 and the second extension arm 122 are respectively provided with a breaking groove 14 and an annular groove 15. The breaking groove 14 is provided on the nail arm portion 12 near the end of the implantation portion 11, and the first extension arm 121 and the second extension arm 122 can be easily broken using a breaking tool. The breaking groove 14 can be provided on the outer surface or the inner surface of the nail arm portion 12.

[0019] An annular tube 13 is provided on one end face of the nail arm portion 12 away from the implantation portion 11, which prevents the nail arm portion 12 from being deformed and facilitates the connection of the annular tube 13 with a breaking tool to simultaneously break the first extension arm 121 and the second extension arm 122. The first extension arm 121 and the second extension arm 122 are integrally formed when processing the nail arm portion 12.

[0020] Furthermore, in order to facilitate the clamping of the pedicle screw 10 implanted in the vertebra by the lifting tool so as to lift and reposition the vertebra, an annular groove 15 is provided at the connection between the annular tube 13 and the screw arm portion 12 .

[0021] During the operation, a minimally invasive incision is made at the vertebra to be fixed, and a guide pin is inserted into the vertebra through the incision. The reamer sleeves of different specifications are inserted into the bone surface from small to large in order to expand step by step and establish a channel. A bone tap with a suitable diameter is selected to tap along the guide pin to establish a nail channel, and then the long-arm hollow pedicle screw 10 is screwed into the bone along the guide pin with a nailing device, and the long-arm hollow pedicle screw 10 is screwed into different vertebrae, and then a connecting rod is inserted into the long-arm hollow pedicle screw 10, and then a compression screw is passed through the annular tube 13 and enters the nail wall 12 to lock the connecting rod, so that multiple long-arm hollow pedicle screws 10 become a whole. At the end of the operation, a breaking tool is fixed on the annular tube 13, and the breaking tool is rotated, and the first extension arm 121 and the second extension arm 122 of the nail arm can be easily broken along the breaking groove 14.

[0022] In short, the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A long-arm hollow pedicle screw, characterized in that: include: A hollow implant portion for implantation into a pedicle; a long-arm-shaped nail arm portion axially connected to the implant portion; The nail arm portion has a breaking groove perpendicular to the axis of the implant portion near the implant portion end; The nail arm portion is provided with an annular tube on an end surface away from the implantation portion, which is coaxial with the nail arm portion and integrally formed.

2. The long-arm hollow pedicle screw according to claim 1, characterized in that: The annular tube has a regular hexagonal shape.

3. The long-arm hollow pedicle screw according to claim 1, characterized in that: An annular groove is formed at the connection between the annular tube and the nail arm portion.

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