Anterior cervical internal fixation system

Abstract

The utility model provides an anterior cervical internal fixation system which comprises a long and thin strip-shaped titanium plate, and three threaded holes (suitable for double sections) are formed in the middle portion and the two sides of the far end of the titanium plate. Three bone screws are sequentially and fixedly connected to the threaded holes, so that an integrated supporting structure is formed. Therefore, a traditional single-vertebral-body double-screw fixing mode is changed, and a single-vertebral-body single-screw anterior cervical internal fixing system is designed. According to the system, the bone screws are fixedly connected with the threaded holes in the titanium plate to form an integrated supporting structure, so that the overall locking effect is achieved; in addition, by increasing the diameter of a screw body, injecting bone cement into a lateral hole of the screw and increasing the width of the titanium plate, the holding force can be further improved, operative wounds can be further reduced, and the titanium plate is more suitable for osteoporosis patients.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of medical apparatus and instruments, especially relates to a cervical vertebra anterior internal fixation system. BACKGROUND

[0002] The cervical vertebra anterior titanium plate internal fixation system has great significance in the stability reconstruction of cervical spondylosis, cervical vertebra fracture, cervical spinal stenosis, cervical vertebra infection, cervical vertebra tumor and other diseases, and in the past nearly 20 years of clinical use, becomes the mainstream internal fixation product for treating cervical diseases. The system is mainly composed of a titanium plate and a matched screw, greatly reduces the occurrence of inflammatory reaction and rejection, and creates favorable conditions for postoperative recovery of patients.

[0003] However, the current cervical vertebra anterior titanium plate and screw internal fixation system is mainly single vertebral body double screw, and the screw diameter is small, so that the holding force of the screw in the vertebral body of the patient with severe osteoporosis is rapidly reduced due to the sparse trabecular bone of the vertebral body, the screw is loose, and the incidence of the collapse of the internal implant such as the fusion cage and the titanium mesh is high. UTILITY MODEL CONTENTS

[0004] In view of the deficiencies in the related art, the cervical vertebra anterior internal fixation system can solve the problem of the decrease of the holding force of the screw in the vertebral body, and is more suitable for use by patients with osteoporosis.

[0005] The cervical vertebra anterior internal fixation system comprises an elongated strip-shaped titanium plate, one or more threaded holes are arranged on the middle part and the two sides of the distal end of the titanium plate, corresponding bone screws are sequentially fixedly connected to the threaded holes to form an integrated support structure, the bone screw has a penetrating hollow structure, and the bottom of the nail body is provided with a closed tip.

[0006] Further, the width of the elongated strip-shaped titanium plate is 9-12 mm.

[0007] Further, three threaded holes are arranged on the middle part and the two sides of the distal end of the titanium plate, and three bone screws are sequentially fixedly connected to the threaded holes.

[0008] Further, the outer surface of the nail body of the bone screw is provided with a first thread, the outer surface of the nail cap is provided with a second thread, and the inner surface of the nail cap is provided with a third thread.

[0009] Further, the diameter of the nail body of the bone screw is 4.5-5 mm.

[0010] Further, a lateral hole is arranged on the sidewall of the middle part of the nail body of the bone screw, and the holes are designed to be symmetrical.

[0011] Further, the number of the lateral holes is 2 or 4.

[0012] Further, the diameter of the lateral hole is 1-1.4mm.

[0013] Further, the width of the titanium plate near the position of the threaded hole is greater than the width away from the position of the threaded hole.

[0014] Further, the first thread is adapted to the fixation of the bone screw shank and the vertebral body, the second thread is adapted to the fixation of the screw cap and the shank, and the third thread is adapted to the fixation of the screw cap and the titanium plate.

[0015] The cervical vertebra anterior internal fixation system provided by the utility model changes the traditional single vertebral body double screw fixation mode and designs a single vertebral body single screw cervical vertebra anterior internal fixation system. The system is fixedly connected with the threaded hole on the titanium plate through the bone screw, forms an integrated support structure and thus achieves the overall locking effect; in addition, the holding force can be further improved and the surgical trauma can be reduced by increasing the diameter of the screw shank and expanding the width of the titanium plate, so that the system is more suitable for use by osteoporosis patients. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical scheme in the utility model or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or the prior art description. Obviously, the drawings in the following description are some embodiments of the utility model, and those skilled in the art can also obtain other drawings according to these drawings without any creative effort.

[0017] Figure 1 It is the structure schematic view of the cervical vertebra anterior internal fixation system provided by the utility model.

[0018] Figure 2 It is the side view of the cervical vertebra anterior internal fixation system provided by the utility model.

[0019] Figure 3 It is the schematic view of the titanium plate provided by the utility model.

[0020] Figure 4 It is the schematic view of the bone screw provided by the utility model.

[0021] Reference signs:

[0022] In the drawing: 1, titanium plate; 2, threaded hole; 3, bone screw; 4, shank; 5, screw cap; 6, first thread; 7, second thread; 8, third thread; 9, lateral hole. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical scheme and advantages of the utility model clearer, the technical scheme in the utility model will be described clearly and completely in combination with the drawings in the utility model below. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the ordinary skilled in the art without creative labor belong to the protection scope of the utility model.

[0024] Figures 1 to 2 The utility model discloses a cervical vertebra anterior internal fixation system, including slender strip titanium plate 1, be equipped with one or more threaded holes 2 in the middle part and the distal side of titanium plate 1;The threaded hole 2 is fixedly connected with corresponding bone screw 3 in turn, and is one body support structure;The bone screw 3 is the nail body 4 and the nail cap 5 with through hollow structure, and the nail body 4 bottom is equipped with the closed tip.

[0025] Among them, the bottom of the nail body 4 adopts the closed design, can eliminate the risk of bone cement seepage to the spinal canal direction. It is noticed that the threaded hole 2 and the bone screw 3 can be one or more, in this embodiment, preferably 3.

[0026] Figure 3 The utility model discloses the titanium plate 1 used, the titanium plate 1 is slender strip shape, and the width is set as 9-12mm, preferably 10mm, by increasing the width of slender strip titanium plate 1, can let the incision exposure and the pulling injury of surrounding esophagus, nerve and other tissues drop, guarantee the operation safety, reduce the trauma that the operation brings to the patient. Among them, the width of the position of titanium plate 1 close to threaded hole 2 is greater than the width of the position away from threaded hole 2.

[0027] The middle part and the distal side of the titanium plate 1 are equipped with 3 threaded holes 2, and the 3 threaded holes 2 are arranged side by side and can be fixedly installed with 3 bone screws 3, so as to form a cervical vertebra anterior internal fixation system with single vertebral body and single screw.

[0028] Figure 4 The utility model discloses the bone screw 3 used in the cervical vertebra anterior internal fixation system provided by the utility model, the nail body 4 outer surface of the bone screw 3 is provided with first screw thread 6, and the nail cap 5 outer surface is equipped with second screw thread 7, and the third screw thread 8 is arranged in the inner surface of the nail cap 5. By setting different screw threads, the fixation of the bone screw nail body 4 and the vertebral body, the fixation of the nail cap 5 and the nail body 4 and the fixation of the nail cap 5 and the titanium plate 1 can be realized.

[0029] The diameter of the bone screw nail body 4 is 4.5-5mm, and the length is 13-16mm. By increasing the diameter of the screw nail body 4, the stability of the screw in the osteoporotic vertebral body can be increased.

[0030] The side wall of the middle part of the bone screw shank 4 is provided with lateral holes 9, the number of the lateral holes 9 is 2-4, and the diameter is 1-1.4 mm; the bone cement is injected into the vertebral body through the screw hollow channel and the lateral holes 9, and the hardened bone cement fills the trabecular bone hole of the vertebral body to achieve the riveting effect of the repeated structure, so that the bone cement can be effectively dispersed in the lateral direction of the vertebral body, and the holding force of the screw in the vertebral body is further increased.

[0031] Finally, it should be noted that: the above examples are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A cervical spine anterior internal fixation system, characterized in that, It comprises an elongated strip-shaped titanium plate, one or more threaded holes are arranged on both sides of the middle part and the distal end of the titanium plate, corresponding bone screws are fixedly connected on the threaded holes in sequence to form an integrated support structure, the bone screw has a nail body with a through hollow structure and a nail cap, and the bottom of the nail body is provided with a closed tip.

2. The cervical spine anterior fixation system of claim 1, wherein, The width of the elongated strip-shaped titanium plate is 9-12 mm.

3. The cervical spine anterior fixation system according to claim 1, wherein, Three threaded holes are arranged on both sides of the middle part and the distal end of the titanium plate, and three bone screws are fixedly connected on the threaded holes in sequence.

4. The cervical spine anterior fixation system of claim 3, wherein, The outer surface of the nail body of the bone screw is provided with a first thread, the outer surface of the nail cap is provided with a second thread, and the inner surface of the nail cap is provided with a third thread.

5. The cervical spine anterior fixation system according to claim 1, wherein, The diameter of the nail body of the bone screw is 4.5-5 mm.

6. The cervical spine anterior fixation system according to claim 1, wherein, A lateral hole is arranged on the side wall of the middle part of the nail body, and the holes are designed in a symmetrical manner.

7. The cervical spine anterior fixation system according to claim 6, wherein, The number of the lateral holes is 2-4.

8. The cervical spine anterior fixation system according to claim 6 or 7, wherein, The diameter of the lateral hole is 1-1.4 mm.

9. The cervical spine anterior fixation system of claim 1, wherein, The width of the titanium plate near the threaded hole is greater than the width of the titanium plate away from the threaded hole.

10. The cervical spine anterior fixation system of claim 4, wherein, The first thread is suitable for the fixation of the nail body of the bone screw and the vertebral body, the second thread is suitable for the fixation of the nail cap and the nail body, and the third thread is suitable for the fixation of the nail cap and the titanium plate.

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