Posterior spinal internal fixing rod and posterior spinal fixing device

Abstract

The utility model provides a posterior spine internal fixing rod and a posterior spine fixing device, the posterior spine internal fixing rod is used for connecting pedicle screws, the posterior spine internal fixing rod comprises first parts fixed with the pedicle screws and second parts arranged between two adjacent first parts, the first parts and the second parts are integrally formed, and the first parts and the second parts are integrally formed. And notches which are axially arranged at intervals are formed in the second part, so that the second part has bending flexibility. According to the spine posterior fixing device and the spine posterior inner fixing rod, the first part and the second part which are integrally formed are arranged, and the notch is formed in the second part, so that the second part between the two pedicle screws has certain bending flexibility; meanwhile, the structural strength of the spine posterior inner fixing rod is ensured.

Description

Technical Field

[0001] The utility model relates to a posterior spinal internal fixation rod and a posterior spinal fixation device. Background Art

[0002] In the prior art, a rigid connecting rod is used to fix multiple pedicle screws in posterior spinal internal fixation. However, such a fixation method has the following problems: 1. The rigid connecting rod may cause fatigue of the metal fixing material, thereby causing the metal fixing material to break and loosen. In addition, the rigid connecting rod may cause stress shielding of the human spine, leading to atrophy of the muscles around the spine, thereby affecting the stability of the spine; 2. The connection of the pedicle screws is completely adjusted by the degree of freedom of the connecting rod, and the degree of freedom of the connecting rod is not easy to control. If the connecting rod is rigid, the pedicle screw may break; if the connecting rod is weak in rigidity, the pedicle screw may detach. The degree of freedom of the pedicle screw controlled only by the connecting rod cannot be controlled; 3. The rigid connecting rod may limit the movement of the spine, leading to stiffness and discomfort.

[0003] In view of this, it is necessary to improve the existing posterior spinal internal fixation rod to solve the above problems. Utility Model Content

[0004] The utility model aims to provide a posterior spinal internal fixation rod to solve the problems of easy breakage of the rigid connecting rod and easy breakage or falling off of the pedicle screws, and discomfort to the patient caused by the existing rigid connecting rods.

[0005] To achieve the above-mentioned purpose, the utility model provides a posterior spinal internal fixation rod for connecting pedicle screws. The posterior spinal internal fixation rod includes a first part fixed to the pedicle screw and a second part arranged between two adjacent first parts. The first part and the second part are integrally formed, and the second part is formed with incisions arranged along the axial direction so that the second part has bending flexibility.

[0006] As a further improvement of the present invention, the posterior spinal internal fixation rod further includes a clamping portion arranged at one end, and the clamping portion is fixedly connected to the first part.

[0007] As a further improvement of the present invention, the posterior spinal internal fixation rod further includes a guide portion arranged at the other end, and the guide portion is fixedly connected to the first portion.

[0008] As a further improvement of the present invention, the middle portion of the first part is hollowed out along the axial direction to form a first through hole.

[0009] As a further improvement of the present invention, the middle portion of the second part is hollowed out along the axial direction to form a second through hole.

[0010] As a further improvement of the present invention, the cutout is formed in a threaded shape around the second portion.

[0011] As a further improvement of the present invention, the length of the cutout of each second part along the axial direction is 1.5-8 mm, and the width of the cutout along the axial direction is 0.1-1.3 mm.

[0012] As a further improvement of the present invention, the incision includes a plurality of first incisions arranged on the same side.

[0013] As a further improvement of the utility model, the distance between the two farthest first grooves on each second part is 3-6 mm, the radial cutting depth of the first groove is 50%-70% of the diameter of the second part, and the width of the first groove is 0.3-1 mm.

[0014] As a further improvement of the utility model, the incision also includes a second groove arranged on the other side, the second groove is staggered with the first groove, the radial cutting depth of the second groove is 25%-50% of the diameter of the second part, and the width of the second groove is 0.3-1mm.

[0015] As a further improvement of the present invention, the posterior spinal internal fixation rod is made by 3D printing, and the material of the posterior spinal internal fixation rod is titanium alloy or tantalum alloy.

[0016] The utility model also provides a posterior spinal fixation device, which includes a plurality of pedicle screws and a posterior spinal internal fixation rod as described above, wherein the posterior spinal internal fixation rod is used to connect the plurality of pedicle screws, the first part is fixed to the pedicle screws, and the second part is arranged between two adjacent pedicle screws.

[0017] The beneficial effect of the utility model is that the posterior spinal fixation device and the posterior spinal internal fixation rod of the utility model are provided with an integrally formed first part and a second part, and a notch is formed on the second part, so that the second part between the two pedicle screws has a certain bending flexibility, while ensuring the structural strength of the posterior spinal internal fixation rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the posterior spinal fixation device of the utility model;

[0019] Figure 2 It is a structural schematic diagram of a spinal posterior internal fixation rod with a guide portion in the first embodiment of the utility model;

[0020] Figure 3It is a schematic structural diagram of the posterior spinal internal fixation rod without a guide portion of the utility model;

[0021] Figure 4 yes Figure 2 Schematic diagram of the cross-section structure in the AA direction;

[0022] Figure 5 It is a structural schematic diagram of a posterior spinal internal fixation rod according to a second embodiment of the utility model;

[0023] Figure 6 It is a structural schematic diagram of a posterior spinal internal fixation rod according to a third embodiment of the utility model. DETAILED DESCRIPTION

[0024] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention 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, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0026] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances. In addition, the technical features involved in the different embodiments of the present utility model described below can be combined with each other as long as they do not conflict with each other.

[0027] like Figures 1 to 6 As shown, the posterior spinal fixation device 100 of the present invention comprises a plurality of pedicle screws 2 and a posterior spinal internal fixation rod 1 , wherein the posterior spinal internal fixation rod 1 is used to connect the plurality of pedicle screws 2 .

[0028] According to the different segments of the spine that require surgery and the different numbers of pedicle screws 2 of the patient, different lengths of posterior spinal internal fixation rods 1 are selected. In this embodiment, the posterior spinal internal fixation rod 1 is cylindrical as a whole, with a diameter range of 3.5-6.5mm and a length range of 40-600mm.

[0029] like Figures 2 to 6 As shown, the posterior spinal internal fixation rod 1 includes a first portion 11 fixed to the pedicle screw 2, a second portion 12 arranged between two adjacent first portions 11, a clamping portion 13 arranged at one end, and a guide portion 14 arranged at the other end, that is, the second portion 12 is arranged between two adjacent pedicle screws 2.

[0030] The first part 11 and the second part 12 are integrally formed, and the second part 12 is formed with cutouts 122 spaced apart in the axial direction so that the second part 12 has bending flexibility. The integrally formed method can shape a certain physiological curvature according to the specific structure of the patient before production, and ensures a certain strength required by biomechanics.

[0031] The posterior spinal internal fixation rod 1 is made by 3D printing, and the material of the posterior spinal internal fixation rod 1 is titanium alloy or tantalum alloy. The posterior spinal internal fixation rod 1 made by 3D printing has better structural strength, and even if the incision 122 is formed on the second part 12, the whole structure can meet the structural strength requirements.

[0032] The clamping portion 13 is fixedly connected to the first portion 11 . In this embodiment, the clamping portion 13 adopts a conventional structure such as a single plane or a hexagonal structure, so as to allow a user to operate and rotate the posterior spinal internal fixation rod 1 .

[0033] like Figure 2 and Figure 4 As shown, the guide portion 14 is fixedly connected to the first portion 11. In this embodiment, the guide portion 14 is a tapered structure with a rounded top.

[0034] like Figure 3 As shown, in some embodiments, the guide portion 14 may not be provided, as long as it can be fixed in cooperation with the pedicle screw 2.

[0035] like Figures 2 to 4 As shown, the middle portion of the first part 11 is hollowed out along the axial direction to form a first through hole 111. During printing, the first part 11 is hollowed out to form the first through hole 111, which can reduce the counter stress and save a certain amount of material. In the embodiment with the guide portion 14, the first through hole 111 at the end protrudes into the guide portion 14.

[0036] The middle part of the second part 12 is hollowed out along the axial direction to form a second through hole 121. The second through hole 121 can make the second part 12 more flexible to cope with bending. In this embodiment, the second through hole 121 is coaxially arranged with the first through hole 111 and is connected to each other, and the apertures are also equal. In other embodiments, the second through hole 121 may not be connected to the first through hole 111, and different apertures may be set according to different strength or flexibility requirements.

[0037] The present invention provides the following three implementations according to different forms of the incision 122:

[0038] Implementation method 1:

[0039] like Figures 2 to 4 As shown, in this embodiment, the cutout 122 is formed in a thread shape around the second portion 12 .

[0040] The length of the cutout 122 of each second portion 12 along the axial direction is 1.5-8 mm, and the width of the cutout 122 along the axial direction is 0.1-1.3 mm.

[0041] The length of the cutout 122 along the axial direction refers to the distance between the farthest ends of the cutout 122 on each second portion 12 . The width of the cutout 122 along the axial direction refers to the width of each groove cut into the second portion 12 .

[0042] In this embodiment, by providing the threaded cutout 122 , the bending properties of the second portion 12 in multiple directions are made similar, which facilitates the installation and fixation of the posterior spinal internal fixation rod 1 .

[0043] Implementation method 2:

[0044] like Figure 5 As shown, in this embodiment, the cutouts are a plurality of first cutouts 123 arranged on the same side.

[0045] The distance between the two farthest first grooves 123 on each second part 12 is 3-6 mm, the radial cutting depth of the first groove 123 is 50%-70% of the diameter of the second part 12, and the width of the first groove 123 is 0.3-1 mm.

[0046] The first slots 123 are arranged on the same side, and during installation, the first slots 123 are oriented toward the side where the spine needs to be bent, so as to meet the activity requirements of the spine and ensure sufficient installation strength.

[0047] Implementation method three:

[0048] like Figure 6As shown, this embodiment is carried out on the basis of the second embodiment. In this embodiment, the incision also includes a second groove 124 arranged on the other side. The second groove 124 is staggered with the first groove 123. The radial cutting depth of the second groove 124 is 25%-50% of the diameter of the second part 12. The width of the second groove 124 is 0.3-1mm. This embodiment can improve the flexibility of the second part 12 and better solve the problems of stress shielding.

[0049] The posterior spinal fixation device 100 and the posterior spinal internal fixation rod 1 of the utility model are provided with an integrally formed first part 11 and a second part 12, and a notch 122 is formed on the second part 12, so that the second part 12 between the two pedicle screws 2 has a certain bending flexibility, while ensuring the structural strength of the posterior spinal internal fixation rod 1. The posterior spinal fixation device 100 and the posterior spinal internal fixation rod 1 of the utility model solve the stress shielding problem, reduce tissue stimulation, reduce the complexity of device installation, have a certain relief for movement restriction, and can effectively reduce postoperative complications, such as infection, nerve damage, dura mater tear, screw loosening, etc.

[0050] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0051] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A spinal posterior internal fixation rod for connecting pedicle screws, characterized in that: The posterior spinal internal fixation rod includes a first part fixed to the pedicle screw and a second part arranged between two adjacent first parts. The first part and the second part are integrally formed, and the second part is formed with axially spaced cutouts to make the second part flexible.

2. The posterior spinal internal fixation rod according to claim 1, characterized in that: The spinal posterior internal fixation rod further comprises a clamping portion arranged at one end, and the clamping portion is fixedly connected to the first part.

3. The posterior spinal internal fixation rod according to claim 2, characterized in that: The spinal posterior internal fixation rod further includes a guide portion arranged at the other end, and the guide portion is fixedly connected to the first portion.

4. The posterior spinal internal fixation rod according to claim 1, characterized in that: The middle portion of the first part is hollow along the axial direction to form a first through hole.

5. The posterior spinal internal fixation rod according to claim 1, characterized in that: The middle portion of the second part is hollow along the axial direction to form a second through hole.

6. The posterior spinal internal fixation rod according to claim 1, characterized in that: The cutout is formed in a thread shape around the second portion.

7. The posterior spinal internal fixation rod according to claim 6, characterized in that: The length of the cutout of each second part along the axial direction is 1.5-8 mm, and the width of the cutout along the axial direction is 0.1-1.3 mm.

8. The posterior spinal internal fixation rod according to claim 1, characterized in that: The cutout includes a plurality of first cutouts arranged on the same side.

9. The posterior spinal internal fixation rod according to claim 8, characterized in that: The distance between the two first grooves which are farthest from each other on each second part is 3-6 mm, the radial cutting depth of the first groove is 50%-70% of the diameter of the second part, and the width of the first groove is 0.3-1 mm.

10. The posterior spinal internal fixation rod according to claim 8, characterized in that: The incision also includes a second groove arranged on the other side, the second groove is staggered with the first groove, the radial cutting depth of the second groove is 25%-50% of the diameter of the second part, and the width of the second groove is 0.3-1mm.

11. The posterior spinal internal fixation rod according to any one of claims 1 to 10, characterized in that: The posterior spinal internal fixation rod is made by 3D printing, and the material of the posterior spinal internal fixation rod is titanium alloy or tantalum alloy.

12. A posterior spinal fixation device, characterized in that: The posterior spinal fixation device includes a plurality of pedicle screws and a posterior spinal internal fixation rod as described in any one of claims 1-11, wherein the posterior spinal internal fixation rod is used to connect the plurality of pedicle screws, the first part is fixed to the pedicle screws, and the second part is arranged between two adjacent pedicle screws.

Images