An anterior spinal structural bone grafting and internal fixation device

Abstract

The application discloses a spinal anterior structural bone grafting internal fixation device, which comprises a fixing sheath and a steel nail group, the steel nail group is arranged in the fixing sheath, the steel nail group comprises a first fixing nail, a second fixing nail and a third fixing nail, the top of the first fixing nail is connected with a bent first connecting arm, and the top of the second fixing nail is connected with a bent second connecting arm; an adjusting part for adjusting the telescopic length of the first connecting arm and the second connecting arm is arranged on a convex ring of the inner wall of the fixing sheath in a clearance fit mode, and a locking part is arranged above the convex ring; the third fixing nail is arranged in a through hole of the fixing sheath, the top surface of the third fixing nail is provided with a pressing block, and the pressing block presses the locking part into the space between the convex ring and the adjusting part. The device has good stability after the overall structure is combined, and the bone grafting block is fixed firmly; in addition, the device is light and thin, has a small volume, and thus needs a small wound to be formed, has less bleeding, has less damage to the bone, and reduces trauma during and after the operation.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of orthopedic implants, in particular to a spinal anterior structural bone grafting internal fixation device. BACKGROUND

[0002] In spinal surgery, intervertebral bone grafting is a commonly used and effective treatment method. Intervertebral structural bone grafting can better restore the mechanical stability of the spine, but if the implanted bone block is not effectively fixed, it is easy to fall off and cause serious surgical complications.

[0003] The commonly used fixation methods include a steel plate system or a lumbar pedicle screw system. Although the aforementioned fixation methods are reliable, they have large surgical trauma, extensive tissue separation, and large intraoperative bleeding. For patients with spinal structure infection, spinal lesion debridement and bone grafting internal fixation are commonly used and effective methods, but the original anterior titanium plate fixation method is not suitable, so a posterior multi-segment percutaneous vertebral screw rod system internal fixation is often performed. When there is fixation in the posterior route, the fixation of the bone graft block in the anterior route does not have to be too strong, and the requirement for the fixation method is only to prevent the bone graft block from falling off. Therefore, the original commonly used spinal anterior fixation method, whether it is a steel plate system or a pedicle screw system, is complex and has large trauma. SUMMARY

[0004] The technical problem to be solved by the present application is to provide a spinal anterior structural bone grafting internal fixation device which can firmly fix the bone graft block through a simple assembly method and reduce surgical trauma.

[0005] To solve the above technical problems, the following technical solutions are adopted in the present application:

[0006] A spinal anterior structural bone grafting internal fixation device comprises:

[0007] A fixing sheath, the left and right ends of which are open, the top and bottom of the inner wall of which are respectively provided with through holes, and the top surface of the through hole at the bottom of the inner wall of the fixing sheath is provided with a convex ring;

[0008] A steel nail group is arranged in the fixing sheath, and the steel nail group comprises a first fixing nail, a second fixing nail, and a third fixing nail, the top of the first fixing nail is connected with a bent first connecting arm, and the top of the second fixing nail is connected with a bent second connecting arm; an adjusting member for adjusting the telescopic length of the first connecting arm and the second connecting arm is gap-fitted on the convex ring of the inner wall of the fixing sheath, and a locking member is arranged above the convex ring; the third fixing nail is arranged in the through hole of the fixing sheath, and the top surface of the third fixing nail is provided with a pressing block, which presses the locking member into the space between the convex ring and the adjusting member.

[0009] The installation distance of the first fixing nail and the second fixing nail can be adjusted in the fixed sheath through the adjusting piece, and the first fixing nail and the second fixing nail can be fixed horizontally and vertically through the third fixing nail and the locking piece, the device has small bone damage degree and reduces damage.

[0010] According to further expansion of the above scheme, the first connecting arm and the second connecting arm are staggered front and back and laid in the fixed sheath respectively.

[0011] According to further expansion of the above scheme, the opposite end faces of the first connecting arm and the second connecting arm are respectively provided with teeth.

[0012] According to further expansion of the above scheme, the adjusting piece is a gear, and the gear teeth of the adjusting piece are engaged with the teeth of the first connecting arm and the second connecting arm.

[0013] According to further expansion of the above scheme, the locking piece is a cylinder, and the top surface of the cylinder is provided with a flange.

[0014] Compared with the prior art, the application at least realizes the following beneficial effects: the device adjusts the length of the first fixing nail and the second fixing nail through the adjusting piece and limits the rotational swing of the first fixing nail and the second fixing nail, and then locks the adjusting piece through the locking piece, which prevents the adjusting piece from driving the first fixing nail and the second fixing nail to cause bone fracture, limits the up and down displacement of the first fixing nail and the second fixing nail, has good stability after the overall structure is combined, and firmly fixes the bone graft block; secondly, the device has a light and thin structure and a small volume, so that a small wound needs to be opened, bleeding is less, and a damage type opening for placing the steel nail group does not need to be opened on the bone graft block, the destructiveness to the bone is small, and the trauma during or after the operation is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0015] One or more embodiments of the application will now be described, by way of example only, with reference to the accompanying drawings in which:

[0016] Figure 1 It is a front view of the fixing device of one of the embodiments of the application;

[0017] Figure 2 It is a front view of the fixing device of one of the embodiments of the application; Figure 1 It is a sectional view at A-A in FIG. 4;

[0018] Figure 3 It is a front view of the fixing device of one of the embodiments of the application; Figure 1 It is a sectional view of the fixing device of the embodiment;

[0019] Figure 4 It is an exploded view in the state of FIG. 4. Figure 3

[0020] ​The numbers in the diagram are: 1. Fixing sheath; 2. First fixing pin; 3. Barb; 4. Third fixing pin; 5. Second fixing pin; 6. Locking element; 61. Flanged edge; 7. First connecting arm; 8. Pressure block; 81. Force-applying end face; 9. Second connecting arm; 10. Gear. Detailed Implementation

[0021] The present application will now be described in detail with reference to exemplary embodiments shown in the accompanying drawings. However, it should be understood that the present application may be implemented in many different forms and should not be construed as limited to the embodiments set forth herein. These embodiments are provided herein to make the disclosure of the present application more complete and to fully convey the concept of the present application to those skilled in the art.

[0022] In the description of this application, it should be understood that the terms "center", "lateral", "longitudinal", "front", "rear", "left", "right", "upper", "lower", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of this application.

[0023] The inventors addressed the shortcomings of existing spinal surgery techniques, such as the complexity and significant trauma associated with plate systems or pedicle screw systems. After careful analysis, they discovered that these problems primarily stem from the fact that while pedicle screw surgery offers strong fixation and ensures vertebral stability, it also involves significant surgical trauma, a higher risk of wound infection, a longer recovery period, and the potential for nerve or blood vessel injury during screw placement, leading to substantial bleeding. Furthermore, postoperative loosening or breakage of the screws is possible. Plate systems are also largely similar to pedicle screw systems. Based on this analysis, the inventors have made structural improvements to their anterior spinal bone grafting fixation product.

[0024] like Figures 1-4 As shown, in one embodiment of an anterior spinal structural bone graft internal fixation device of this application, the device includes:

[0025] A rectangular fixed sheath 1 with a certain length and a square tube structure. The interior of the fixed sheath 1 is hollow, and its left and right ends are open. The top and bottom of the inner wall of the fixed sheath 1 are respectively provided with coaxial through holes. The top surface of the through hole at the bottom of the inner wall of the fixed sheath 1 is provided with a circular convex ring.

[0026] and a steel nail group arranged in the fixing sheath 1, the steel nail group comprising a first fixing nail 2, a second fixing nail 5 and a third fixing nail 4, the top of the first fixing nail 2 is connected with a bent first connecting arm 7, the top of the second fixing nail 5 is connected with a bent second connecting arm 9, the connection between the first fixing nail 2 and the first connecting arm 7 and the connection between the second fixing nail 5 and the second connecting arm 9 are arc structures, which increase the strength of the transition and reduce the risk of easy breaking of the right angle shape; the convex ring on the inner wall of the fixing sheath 1 is gap-fitted with an adjusting member for adjusting the telescopic length of the first connecting arm 7 and the second connecting arm 9 in the fixing sheath 1, and the upper part of the convex ring is provided with a locking member 6; the third fixing nail 4 is arranged in the through hole of the fixing sheath 1 and penetrates downward from the through hole at the bottom, and the top surface thereof is connected with a pressing block 8, which presses the locking member 6 into the space between the convex ring and the adjusting member to limit the rotation of the locking member 6.

[0027] The through hole at the top of the inner wall of the fixing sheath 1 is a non-circular structure, such as a rectangular structure, and the pressing block 8 and the through hole at this position are matched, which can prevent the third fixing nail 4 from rotating.

[0028] In order to further limit the rotation of the steel nail group and improve the stability of the connection between the steel nail group and the bone graft block, the first fixing nail 2, the second fixing nail 5 and the third fixing nail 4 are all rectangular (such as square) structures, and the outer walls thereof are all provided with a plurality of barbs 3, wherein the barbs 3 are vertically and equidistantly distributed on the four sides of the first fixing nail 2, the second fixing nail 5 and the third fixing nail 4, respectively.

[0029] In order to be able to adjust and fix the first fixing nail 2 and the second fixing nail 5 through the fixing sheath 1, as shown in Figure 2 and Figure 3 , the first connecting arm 7 and the second connecting arm 9 are laid in the fixing sheath 1 in front of and behind each other, respectively.

[0030] In addition, in order to facilitate the adjustment of the relative positions of the first fixing nail 2 and the second fixing nail 5, the opposite end faces of the first connecting arm 7 and the second connecting arm 9 are respectively provided with teeth.

[0031] Correspondingly, the adjusting member is a gear 10, and the gear teeth of the adjusting member are engaged with the teeth of the first connecting arm 7 and the second connecting arm 9.

[0032] When adjusting the relative distance between the first and second fixation nails 2 and 5, the first connecting arm 7 of the first fixation nail 2 is first engaged with the adjusting member, and then the second connecting arm 9 of the second fixation nail 5 is engaged with the adjusting member. The first fixation nail 2 is pushed to the right (or the second fixation nail 5 is pushed to the left), and the gear 10 is rotated, thereby bringing the second connecting arm 9 (or the first connecting arm 7) into the fixation sheath 1. Alternatively, if the first fixation nail 2 needs to be extended longer than the second fixation nail 5, the second connecting arm 9 of the second fixation nail 5 is extended into the fixation sheath 1 to engage with the adjusting member, and then pushed inward to a certain size. Then, the first connecting arm 7 of the first fixation nail 2 is extended into the fixation sheath 1 to engage with the adjusting member, and finally the left end of the second fixation nail 5 is pushed to contact the right end surface of the fixation sheath 1. At this time, the first connecting arm 7 still has a part exposed outside the fixation sheath 1, and this length is the length by which the first fixation nail 2 needs to be extended longer than the second fixation nail 5.

[0033] In order to facilitate the viewing of the distance, scale lines are provided on the top surfaces of the first and second connecting arms 7 and 9, and the relative positions of the first and second fixation nails 2 and 5 can be adjusted by the scale lines.

[0034] As shown in Figure 4 , the locking member 6 has a certain thickness and is a cylinder, and the top surface of the locking member 6 is provided with an outwardly turned edge 61. After the first and second fixation nails 2 and 5 are installed in the fixation sheath 1, the locking member 6 is pressed downward by the pressing block 8 on the top of the third fixation nail 4, so that the locking member 6 is installed in the gap between the adjusting member and the convex ring in an interference fit. The contact friction between the locking member 6 and the adjusting member and the convex ring can limit the rotation of the adjusting member and thereby inhibit the swinging of the connecting arms, so as to prevent the first and second fixation nails 2 and 5 from rotating in the bone graft block. In addition, as shown in Figure 2 , the height of the adjusting member is lower than that of the first and second connecting arms 7 and 9. Therefore, when the locking member 6 is placed in the gap between the adjusting member and the convex ring, the bottom surface of the turned edge 61 of the top surface of the locking member 6 is in contact with the top surfaces of the first and second connecting arms 7 and 9, and presses the top surfaces to prevent them from being raised. The locking member 6 can be used to limit the positions of the first and second fixation nails 2 and 5 in the horizontal and vertical directions at the same time.

[0035] The convex ring is higher than the adjusting member, and the locking member 6 is sleeved on the convex ring and located above the gap between the adjusting member and the convex ring. During the rotation of the adjusting member, the locking member 6 is not pressed into the gap between the adjusting member and the convex ring and is not displaced.

[0036] In addition, the bottom of the first and second connecting arms 7 and 9 can be connected to one or more than one first or second fixation nail 2 or 5.

[0037] The embodiment also provides a method for using the fixing device: first, the first connecting arm 7 and the second connecting arm 9 are used to adjust the relative positions of the first fixing nail 2 and the second fixing nail 5 according to a predetermined size, and the first connecting arm 7 and the second connecting arm 9 are arranged into the fixing sheath 1; then, the third fixing nail 4 is arranged in the through hole on the top surface of the fixing sheath 1, the top surface of the pressing block 8 on the top of the third fixing nail 4 is connected with a round-plate type force applying end surface 81, force is applied to the force applying end surface 81 downward, the bottom of the pressing block 8 and the top surface of the flange 61 of the locking piece 6 are in contact and the locking piece 6 is pressed into the gap between the adjusting piece and the convex ring downward, the rotation of the adjusting piece is limited, the bottom surface of the flange 61 is in contact with the first connecting arm 7 and the second connecting arm 9, the top surfaces of the first connecting arm 7 and the second connecting arm 9 are pressed to prevent the top surfaces from being buckled, and the whole fixing device is assembled stably and reliably; finally, the first fixing nail 2, the second fixing nail 5 and the third fixing nail 4 of the fixing device are arranged into the hole prearranged on the bone graft, and the fixation of the spine is completed.

[0038] The fixing device is light and thin as a whole, has a small volume, only needs to arrange a hole on the bone graft, has a small destructive effect on the bone graft, can reduce the risk of postoperative complications, can adjust the distance between the left and right fixing nails, is suitable for bone grafts of different sizes and lengths, and has good adaptability.

[0039] It should be understood that all the above embodiments are exemplary but not limiting, and various modifications or changes made to the specific embodiments described above by those skilled in the art under the concept of the present application should be within the protection scope of the present application.

Claims

1. A structural bone grafting internal fixation device for anterior spinal surgery, characterized in that, The application relates to a fixing sheath and a steel nail group. The fixing sheath is provided with an opening-shaped top and a bottom, and a through hole is arranged in the top and the bottom; a convex ring is arranged on the top of the through hole in the bottom; a steel nail group is arranged in the fixing sheath; the steel nail group comprises a first fixing nail, a second fixing nail and a third fixing nail; the top of the first fixing nail is connected with a bent first connecting arm; the top of the second fixing nail is connected with a bent second connecting arm; the convex ring is provided with an adjusting part which is arranged in the fixing sheath and is used for adjusting the length of the first connecting arm and the second connecting arm; the top of the convex ring is provided with a locking part; the third fixing nail is arranged in the through hole of the fixing sheath and is provided with a pressing block on the top; the pressing block is used for pressing the locking part into the space between the convex ring and the adjusting part; the locking part is a cylinder and is provided with a turned-up edge on the top. The through hole in the top of the fixing sheath is in a rectangular structure. The first fixing nail, the second fixing nail and the third fixing nail are all in a rectangular structure and are all provided with barbs on the outer walls.

2. The fixture of claim 1, wherein The first connecting arm and the second connecting arm are staggered in the fixing sheath.

3. The fixture of claim 1, wherein The opposite end faces of the first connecting arm and the second connecting arm are respectively provided with teeth.

4. The fixture of claim 3, wherein The adjusting part is a gear, and the gear teeth of the adjusting part are engaged with the teeth of the first connecting arm and the second connecting arm.

5. The fixture of claim 4, wherein ​ 6. The fixture of claim 5, wherein ​

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