Internal fixation device for anterior spine structural bone grafting

Abstract

The invention discloses a spine anterior structural bone grafting internal fixing device which comprises a fixing sheath and a steel nail set, the steel nail set is arranged in the fixing sheath and 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. The top of the second fixing nail is connected with a bent second connecting arm; a convex ring on the inner wall of the fixing sheath is sleeved with an adjusting piece for adjusting the telescopic length of the first connecting arm and the second connecting arm in a clearance fit mode, and a locking piece is arranged above the convex ring; the third fixing nail is arranged in the through hole of the fixing sheath, a pressing block is arranged on the top face of the third fixing nail, and the locking piece is pressed between the protruding ring and the adjusting piece through the pressing block. After the whole structure of the device is combined, the stability is good, and a bone grafting block is firmly fixed; and secondly, the device is light and thin in structure and small in volume, so that a wound needing to be formed is small, bleeding is little, damage to bones is small, and trauma in an operation or after the operation is reduced.

Description

Technical Field

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

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

[0003] Commonly used fixation methods include plate systems or lumbar pedicle screw systems. Although the aforementioned fixation methods are reliable, they are very traumatic, involve a lot of tissue separation, and cause a lot of intraoperative bleeding. For patients with nuclear infection of the spinal structure, spinal lesion removal and bone grafting internal fixation is a common and effective method, but the original titanium plate fixation method in the anterior stage is not applicable, so a posterior multi-segment percutaneous vertebral screw-rod system internal fixation is often performed. When there is fixation in the posterior approach, the anterior bone graft fixation does not need to be too strong, and the fixation method only requires preventing the bone graft from falling off. Then the original commonly used anterior spinal fixation methods, whether it is a plate system or a pedicle screw system, appear to be complicated and traumatic. Summary of the invention

[0004] The technical problem to be solved by the present application is to provide an anterior spinal structural bone graft internal fixation device, which can not only firmly fix the bone graft block through a simple assembly method, but also reduce surgical trauma.

[0005] In order to solve the above technical problems, this application adopts the following technical solutions:

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

[0007] The fixed sheath has openings at both ends, through holes at the top and bottom of the inner wall, and a convex ring is provided on the top surface of the through hole at the bottom of the inner wall of the fixed sheath;

[0008] A steel nail group is arranged in a fixing sheath, and the steel nail group includes 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 piece for adjusting the telescopic length of the first connecting arm and the second connecting arm is loosely fitted on the convex ring on the inner wall of the fixing sheath, and a locking piece is provided above the convex ring. The third fixing nail is arranged in the through hole of the fixing sheath, and a pressure block is provided on the top surface thereof, and the pressure block presses the locking piece between the convex ring and the adjusting piece.

[0009] The installation distance between the first fixing nail and the second fixing nail can be adjusted in the fixing sheath through the adjusting piece, and the first fixing nail and the second fixing nail can be fixed horizontally and vertically in cooperation with the third fixing nail and the locking piece. The device has little damage to the bone and reduces the injury.

[0010] According to a further development of the above scheme, the first connecting arm and the second connecting arm are respectively laid in the fixing sheath with a front-to-back staggered arrangement.

[0011] According to a further development of the above solution, teeth are respectively formed on the opposite end surfaces of the first connecting arm and the second connecting arm.

[0012] According to a further development of the above solution, the adjusting member is a gear, and the gear teeth of the adjusting member are meshed with the teeth of the first connecting arm and the second connecting arm.

[0013] According to a further development of the above solution, the locking member is a cylinder with a flange on its top surface.

[0014] Compared with the prior art, the present application achieves at least the following beneficial effects: the present device adopts an adjusting member to adjust the length of the first fixing nail and the second fixing nail and limit their rotational swing, and then locks the adjusting member through a locking member, which not only prevents the adjusting member from driving the first fixing nail and the second fixing nail to cause bone fracture, but also limits the up and down displacement of the first fixing nail and the second fixing nail, so that the overall structure after assembly has good stability and firmly fixes the bone graft block; secondly, the present device has a light and thin structure and a small volume, so the wound to be opened is small and the bleeding is less. At the same time, there is no need to open a damaging opening on the bone graft block except for placing the steel nail group, which is less destructive to the bone and reduces the trauma during or after the operation. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0016] Figure 1 This is a front view of a fixing device according to one embodiment of the present application;

[0017] Figure 2 for Figure 1 Sectional view at AA in the middle;

[0018] Figure 3 for Figure 1 A perspective cross-sectional view of a fixing device of an embodiment;

[0019] Figure 4 for Figure 3 Exploded view of the state.

[0020] The numbers in the figure are: 1, fixed sheath; 2, first fixed nail; 3, barb; 4, third fixed nail; 5, second fixed nail; 6, locking piece; 61, flange; 7, first connecting arm; 8, pressure block; 81, force-applying end face; 9, second connecting arm; 10, gear. DETAILED DESCRIPTION

[0021] The present application will be described in detail below with reference to the exemplary embodiments in the accompanying drawings. However, it should be understood that the present application can be implemented in a variety of different forms and should not be construed as being limited to the embodiments described herein. These embodiments are provided here 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 the present application, it should be understood that the terms "center", "lateral", "longitudinal", "front", "back", "left", "right", "up", "down", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the scope of protection of the present application.

[0023] The existing technology has the defects that the steel plate system or lumbar pedicle screw system in spinal surgery is relatively complex and has great trauma. After careful analysis, the inventor found that the main reason for the above problems is that the advantage of lumbar pedicle screw surgery is that it has a strong fixation force and can ensure the stability of the vertebral body, but the surgical trauma is large, it is easy to cause wound infection, and the recovery period is long. Nerves or blood vessels may be accidentally injured during the screw placement process, resulting in a large amount of bleeding, and the screw rod may become loose or broken after the operation; and the steel plate system is roughly similar to the lumbar pedicle screw system. Based on the above analysis, the inventor has made structural improvements to the products of anterior spinal bone grafting fixation.

[0024] like Figure 1-4 As shown, in one embodiment of the present invention, a spinal anterior structural bone graft internal fixation device comprises:

[0025] A rectangular fixed sheath 1 with a certain length and a square structure, wherein the interior of the fixed sheath 1 is hollow, and the left and right ends thereof are respectively open, and the top and bottom of the inner wall of the fixed sheath 1 are respectively provided with coaxial through holes, and 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, which is arranged in the fixed sheath 1, the steel nail group includes 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 second fixing nail 5 and the second connecting arm 9 is an arc surface structure, which increases the strength of the transition and reduces the risk of easy breakage of the right angle; an adjusting member that can adjust the telescopic length of the first connecting arm 7 and the second connecting arm 9 in the fixed sheath 1 is sleeved on the convex ring of the inner wall of the fixed sheath 1 with clearance fit, and a locking member 6 is provided above the convex ring; the third fixing nail 4 is arranged in the through hole of the fixed sheath 1, and passes downward from the through hole at the bottom, and its top surface is connected with a pressure block 8, which presses the locking member 6 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 matches the through hole at this position, 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 its connection with 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 their outer walls are 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.

[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 FIG. Figure 2 and Figure 3 As shown, the first connecting arm 7 and the second connecting arm 9 are respectively laid in the fixing sheath 1 with a front-to-back staggered arrangement.

[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, teeth are respectively formed on the opposite end surfaces of the first connecting arm 7 and the second connecting arm 9.

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

[0032] When adjusting the relative spacing between the first fixing nail 2 and the second fixing nail 5, the first connecting arm 7 of the first fixing nail 2 is selected to mesh with the adjusting member first, and then the second connecting arm 9 of the second fixing nail 5 is meshed with the adjusting member, and the first fixing nail 2 is pushed to the right (or the second fixing nail 5 is pushed to the left), and the gear 10 will rotate, thereby bringing the second connecting arm 9 (or the first connecting arm 7) into the fixing sheath 1. In addition, if the first fixing nail 2 needs to be extended longer than the second fixing nail 5, the second connecting arm 9 of the second fixing nail 5 can be extended into the fixing sheath 1 to mesh with the adjusting member, and then after being pushed inward to a certain size, the first connecting arm 7 of the first fixing nail 2 is extended into the fixing sheath 1 to mesh with the adjusting member, and finally the left end of the second fixing nail 5 is pushed to contact the right end face of the fixing sheath 1. At this time, a part of the first connecting arm 7 is still exposed outside the fixing sheath 1, and this length is the length that the first fixing nail 2 needs to extend longer than the second fixing nail 5.

[0033] In order to facilitate checking of the spacing, scale lines are provided on the top surfaces of the first connecting arm 7 and the second connecting arm 9, and the relative positions of the first fixing nail 2 and the second fixing nail 5 can be adjusted by the scale lines.

[0034] like Figure 4 As shown, the locking member 6 is a cylinder with a certain thickness, and its top surface is provided with an outward flange 61. The function of the locking member 6 is that after the first fixing nail 2 and the second fixing nail 5 are installed in the fixing sheath 1, the locking member 6 is pressed downward by the pressure block 8 on the top of the third fixing nail 4, so that the locking member 6 is installed in the gap between the adjusting member and the convex ring with interference fit, and the friction between the locking member 6 and the adjusting member and the convex ring is used to limit the rotation of the adjusting member, thereby inhibiting the swing of the connecting arm and the second connecting arm 9, and preventing the first fixing nail 2 and the second fixing nail 5 from rotating in the bone graft block. In addition, refer to Figure 2 The height of the adjusting member is lower than the first connecting arm 7 and the second connecting arm 9. Therefore, when the locking member 6 is placed in the gap between the adjusting member and the convex ring, the locking member 6 continues to be pressed down, and the bottom surface of the flange 61 on its top surface contacts the first connecting arm 7 and the second connecting arm 9, pressing the top surfaces of the two to prevent them from tilting, and the lateral and longitudinal directions can be limited 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 will not enter the gap between the adjusting member and the convex ring without being subjected to pressure, and will not be displaced.

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

[0037] The present embodiment also provides a method for using the fixing device: firstly, the relative positions of the first connecting arm 7 and the second connecting arm 9 are adjusted according to the predetermined size, so that the first connecting arm and the second connecting arm 9 are arranged in the fixing sheath 1; then, the third fixing nail 4 is inserted into 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 disc-shaped force-applying end surface 81, and force is applied downward to the force-applying end surface, so that the bottom of the pressing block 8 contacts the top surface of the flange 61 of the locking member 6 and presses the locking member 6 downward into the gap between the adjusting member and the convex ring, restricting the rotation of the adjusting member, and the bottom surface of the flange 61 contacts the first connecting arm 7 and the second connecting arm 9, pressing the top surfaces of the two to prevent them from tilting, and the whole fixing device is assembled firmly and securely; finally, the first fixing nail 2, the second fixing nail 5 and the third fixing nail 4 of the fixing device are inserted into the holes pre-opened on the bone graft block to complete the fixation of the spine.

[0038] The fixation device is light and thin as a whole, with a small volume. It only needs to open one hole in the bone graft block, which is less destructive to the bone graft block and can reduce the risk of postoperative complications. The spacing between the left and right fixation nails can be adjusted to accommodate bone graft blocks of different sizes and lengths, and has good adaptability.

[0039] It should be understood that all the above embodiments are illustrative rather than restrictive, and various modifications or variations made by those skilled in the art to the specific embodiments described above under the concept of the present application should be within the protection scope of the present application.

Claims

1. A spinal anterior structural bone graft internal fixation device, characterized in that: include: The fixed sheath has openings at both ends, through holes at the top and bottom of the inner wall, and a convex ring is provided on the top surface of the through hole at the bottom of the inner wall of the fixed sheath; A steel nail group is arranged in a fixing sheath, and the steel nail group includes 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 piece for adjusting the telescopic length of the first connecting arm and the second connecting arm is loosely fitted on the convex ring on the inner wall of the fixing sheath, and a locking piece is provided above the convex ring. The third fixing nail is arranged in the through hole of the fixing sheath, and a pressure block is provided on the top surface thereof, and the pressure block presses the locking piece between the convex ring and the adjusting piece.

2. The fixing device according to claim 1, characterized in that: The through hole at the top of the inner wall of the fixing sheath is a rectangular structure.

3. The fixing device according to claim 1, characterized in that: The first fixing nail, the second fixing nail and the third fixing nail are all rectangular structures, and the outer walls thereof are all provided with barbs.

4. The fixing device according to claim 3, characterized in that: The first connecting arm and the second connecting arm are respectively laid in the fixing sheath in a staggered manner front and back.

5. The fixing device according to claim 4, characterized in that: The opposite end surfaces of the first connecting arm and the second connecting arm are respectively provided with teeth.

6. The fixing device according to claim 5, characterized in that: The adjusting member is a gear, and the gear teeth of the adjusting member are meshed with the teeth of the first connecting arm and the second connecting arm.

7. The fixing device according to claim 1, characterized in that: The locking piece is a cylinder, and a flange is arranged on the top surface thereof.

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