Connecting device for preventing artificial vertebral body from moving backwards in anterior cervical surgery

Abstract

The invention discloses a connecting device for preventing an artificial vertebral body from moving backwards in an anterior cervical surgery, and relates to the technical field of medical instruments, the connecting device comprises a far end connected with the artificial vertebral body and a near end connected with a steel plate, and the far end and the near end are connected through a middle part. The near end is connected to the steel plate, the far end is connected to the titanium mesh, the titanium mesh is fixed relative to the steel plate by arranging the titanium mesh fixing device between the steel plate fixed to the vertebral body and the artificial vertebral body (titanium mesh), and the problem that the titanium mesh is prone to moving backwards after an operation is solved.

Description

Technical Field

[0001] The invention relates to the technical field of medical devices, and in particular to a connecting device for preventing posterior displacement of artificial vertebrae in anterior cervical surgery. Background Art

[0002] Anterior cervical corpectomy is a procedure that removes part of the vertebral body and adjacent intervertebral disc to achieve decompression of the spinal cord and nerve roots. In some patients, cervical spinal stenosis comes from bone hyperplasia and ligament ossification at the back of the vertebral body. In this case, it may be necessary to remove one or more vertebral bodies and the upper and lower intervertebral discs to achieve appropriate decompression of the spinal cord and nerve roots. Bone grafting and plates and screws are used to reconstruct the spine and provide stability.

[0003] Since the introduction of anterior vertebral decompression and autologous bone implantation and fusion in 1955, this method has been widely used to treat various cervical diseases and has greatly promoted the development of anterior cervical fusion technology. Since the application of cervical plate internal fixation, the effect of this surgery has been greatly improved, and the incidence of complications such as bone graft displacement, bone nonunion, and pseudoarthrosis has been significantly reduced; in 1986, a scholar designed a cylindrical titanium mesh covered with mesh for the first time as a support for the vertebral body and applied it to spinal surgery. The emergence of titanium mesh avoids complications such as bone graft fracture collapse and bone donor area that existed in previous surgeries.

[0004] However, with the increasing popularity of anterior cervical titanium mesh implantation, the shortcomings it brings are gradually becoming more prominent. Among them, the problem of titanium mesh posterior migration has received more and more attention from spinal surgeons. The posterior migration of the intervertebral fusion cage will cause compression of the dura mater and nerve roots, leading to numbness of the lower limbs, limited movement, and even paralysis. Therefore, completely solving the posterior migration of the intervertebral fusion cage is an important issue facing medical staff. Based on this, a connection device for preventing the posterior migration of artificial vertebrae in anterior cervical surgery is proposed. Summary of the invention

[0005] The present invention aims to provide a connection device for preventing posterior displacement of artificial vertebrae in anterior cervical surgery, so as to solve the problem that posterior displacement of titanium mesh is easy to occur in anterior cervical titanium mesh implantation.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] A connecting device for preventing posterior displacement of an artificial vertebral body in anterior cervical surgery comprises a distal end connected to the artificial vertebral body and a proximal end connected to a steel plate, wherein the distal end and the proximal end are connected via a middle part.

[0008] Furthermore, the distal end is C-shaped, and the opening is located at the farthest part of the distal end, which can hook the artificial vertebral body. The opening is provided with a barb, which can be hooked into the gap of the titanium mesh.

[0009] Furthermore, the distal end is in the shape of a belt-shaped ring, which can cover the artificial vertebral body.

[0010] Furthermore, the proximal end includes a card plate and a card slot, the card plate is U-shaped, the card slots are arranged on both sides of the card plate, the front end of the card slot is a slope structure, and the card slot can be clamped in the hollow part in the middle of the steel plate.

[0011] Furthermore, the distal end, the proximal end and the middle part are made of titanium alloy, ceramic or polymer material.

[0012] Furthermore, the middle part includes a screw, a sleeve and a locking device, the screw is rotationally connected with the U-shaped bottom of the proximal clamping plate, the sleeve is fixed at the distal end, the screw is screwed into the sleeve through a thread, and the locking device fixes the screw.

[0013] Furthermore, the locking device includes a locking pin and a locking groove, one end of the locking pin is connected to the U-shaped bottom of the card plate through a rotating shaft, and a raised locking point is provided at the end of the locking pin away from the rotating shaft. The locking groove is evenly arranged around the nut of the screw, and the locking point can be clamped into the card slot.

[0014] Furthermore, the distal end, the proximal end and the middle portion are integrally formed.

[0015] The principle and beneficial effects of this technical solution:

[0016] The present invention connects the proximal end to the steel plate and the distal end to the titanium mesh. By arranging the present invention between the steel plate fixed on the vertebral body and the artificial vertebral body (titanium mesh), the titanium mesh is fixed relative to the steel plate, thus solving the problem of easy posterior movement of the titanium mesh after surgery. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is an overall schematic diagram of a first embodiment of a connection device for preventing posterior displacement of an artificial vertebral body in anterior cervical surgery;

[0018] Figure 2 It is a partial cross-sectional view of a first embodiment of a connection device for preventing posterior displacement of an artificial vertebral body in anterior cervical surgery;

[0019] Figure 3 This is a schematic diagram of a locking device of a first embodiment of a connection device for preventing posterior displacement of an artificial vertebral body in anterior cervical surgery;

[0020] Figure 4 This is a schematic diagram of a locking pin in Embodiment 1 of a connection device for preventing posterior displacement of an artificial vertebral body in anterior cervical surgery;

[0021] Figure 5 A schematic diagram of a connection device for preventing posterior displacement of an artificial vertebrae in anterior cervical surgery;

[0022] Figure 6The present invention is an overall schematic diagram of a second embodiment of a connection device for preventing posterior displacement of an artificial vertebral body in anterior cervical surgery.

[0023] The reference numerals in the drawings of the specification include:

[0024] 1. Distal end; 101. Barb; 2. Proximal end; 201. Clamp plate; 202. Clamp slot; 203. Slope; 3. Middle part; 301. Screw; 302. Sleeve; 4. Locking device; 401. Locking needle; 402. Locking point; 403. Locking slot; 5. Titanium mesh; 6. Steel plate; 7. Vertebral body. DETAILED DESCRIPTION

[0025] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments:

[0026] Embodiment 1

[0027] like Figure 1-5As shown, a connection device for preventing posterior displacement of an artificial vertebral body 7 in anterior cervical surgery includes a distal end 1 connected to the artificial vertebral body 7 and a proximal end 2 connected to a steel plate 6, and the distal end 1 and the proximal end 2 are connected through a middle part 3. The distal end 1 is C-shaped, and the opening is located at the farthest point of the distal end 1, which can hook the artificial vertebral body 7. The opening is provided with a barb 101, which can be hooked into the gap of the titanium mesh 5 for further fixation. The proximal end 2 includes a clamping plate 201 and a clamping slot 202. The clamping plate 201 is U-shaped, and the clamping slot 202 is arranged on both sides of the clamping plate 201. The front end of the clamping slot 202 is a slope 203 structure, and the clamping slot 202 can be clamped in the hollow part in the middle of the steel plate 6. The middle part 3 includes a screw 301, a sleeve 302 and a locking device 4. The screw 301 is rotatably connected with the U-shaped bottom of the clamping plate 201 at the proximal end 2. The sleeve 302 is fixed to the distal end 1. The screw 301 is screwed into the sleeve 302 through a thread, and the locking device 4 fixes the screw 301. The screw 301 is rotated, and the screw 301 rotates relative to the sleeve 302, and the length of the middle part 3 is changed through the threaded fit. The locking device 4 includes a locking pin 401 and a locking groove 403. One end of the locking pin 401 is connected to the U-shaped bottom of the clamping plate 201 through a rotating shaft. A protruding locking point 402 is provided at one end of the locking pin 401 away from the rotating shaft. The locking grooves 403 are evenly arranged around the nut of the screw 301, and the locking point 402 can be clamped into the clamping groove 202. By rotating the locking pin 401 and clamping the locking point 402 into the locking groove 403, the rotation direction of the screw 301 can be locked, preventing the screw 301 from rotating and changing the length of the middle part 3 after implantation, resulting in poor anti-posterior displacement capability. The present invention is a fixing device arranged between a steel plate 6 fixed on two vertebrae 7 and an artificial vertebrae 7 (a titanium mesh 5 in this embodiment), wherein the titanium mesh 5 is hooked through the C-shaped distal end 1, and its opening is located at the farthest end of the distal end 1. Since the distal end 1 is close to the spinal cord, the farthest end 1 close to the spinal cord is set to an open state to avoid protruding parts to avoid squeezing the spinal cord. The proximal end 2 is clamped on the hollow part in the middle of the steel plate 6 using a U-shaped clamping plate 201. Since the U-shaped clamping plate 201 has a certain elasticity, the clamping plate 201 is aligned with the hollow part in the middle of the steel plate 6 so that the two are pressed tightly, and the steel plate 6 The U-shaped clamping plate 201 can be squeezed by the slope 203 at the front end of the clamping slot 202, so that the U-shaped clamping plate 201 produces elastic deformation, so that the steel plate 6 enters the clamping slot 202 and is fixed. Since the proximal end 2 is clamped in the hollow part in the middle of the steel plate 6, no obvious protrusion will be generated on the surface of the steel plate 6, thereby avoiding the risk of the protrusion scratching the esophagus. The middle part 3 can change the length by rotating the screw 301 to better adapt to patients of different body shapes or different vertebral segments. The present invention fixes the titanium mesh 5 on the steel plate 6, and the titanium mesh 5 is not easy to move, thereby solving the problem of the titanium mesh 5 easily moving backward after surgery.During the operation, since the titanium mesh 5 is placed first and then the steel plate 6 is fixed, when installing the present invention, the distal end 1 and the titanium mesh 5 are fixed relatively and then implanted together, and then the proximal end 2 and the steel plate 6 are fixed. Since the screw 301 and the U-shaped bottom of the clamping plate 201 of the proximal end 2 form a rotational connection, the surgeon can use a tool to screw the screw 301 into the sleeve 302 from the proximal end 2 to complete the installation of the present invention, and finally fix the steel plate 6. In addition, since the steel plate 6 is close to the esophagus, some patients will remove the steel plate 6 about one year after the operation. In the operation of removing the steel plate 6, the screw 301 is also rotated, and the proximal end 2 can be removed together with the steel plate 6, leaving only the distal end 1 and the titanium mesh 5 to grow together with the bone under the proliferation of osteoblasts.

[0028] Embodiment 2

[0029] like Figure 6 As shown, a connection device for preventing the posterior displacement of an artificial vertebral body 7 in anterior cervical surgery includes a distal end 1 connected to the artificial vertebral body 7 and a proximal end 2 connected to the steel plate 6, and the distal end 1 and the proximal end 2 are connected by the middle part 3. The distal end 1 is in a band-shaped ring shape, which can cover the artificial vertebral body 7, and the band-shaped ring can avoid the occurrence of protruding parts at the spinal cord as much as possible to cause extrusion. The proximal end 2 includes a clamping plate 201 and a clamping groove 202, the clamping plate 201 is in a U-shape, the clamping groove 202 is arranged on both sides of the clamping plate 201, the front end of the clamping groove 202 is a slope 203 structure, and the clamping groove 202 can be clamped in the hollow part in the middle of the steel plate 6. The distal end 1, the proximal end 2 and the middle part 3 are integrally formed. Compared with the first embodiment, this embodiment removes the function of the telescopic middle section, but due to the simple structure, it is easier to manufacture, and the situation of patients with different body shapes or different vertebral segments can be solved by producing a variety of models, which is generally a way to reduce production costs.

[0030] In the embodiment of the present invention, the distal end 1, the proximal end 2 and the middle part 3 are made of titanium alloy, ceramic or polymer material.

[0031] The above is only an embodiment of the present invention, and the common knowledge such as the known specific technical solutions and / or characteristics in the solution is not described in detail here. It should be pointed out that for those skilled in the art, without departing from the technical solution of the present invention, several modifications and improvements can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A connection device for preventing posterior displacement of artificial vertebrae in anterior cervical surgery, characterized in that: It comprises a distal end (1) connected to an artificial vertebral body (7) and a proximal end (2) connected to a steel plate (6), wherein the distal end (1) and the proximal end (2) are connected via a middle part (3).

2. A connection device for preventing posterior displacement of artificial vertebrae in anterior cervical surgery according to claim 1, characterized in that: The distal end (1) is C-shaped, and the opening is located at the farthest part of the distal end (1) and can hook the artificial vertebral body (7). The opening is provided with a barb (101) that can hook into the gap of the titanium mesh (5).

3. The connection device for preventing posterior displacement of artificial vertebrae in anterior cervical surgery according to claim 1, characterized in that: The distal end (1) is in the shape of a belt-shaped circular ring and can cover an artificial vertebral body (7).

4. The connection device for preventing posterior displacement of artificial vertebrae in anterior cervical surgery according to claim 1, characterized in that: The proximal end (2) comprises a clamping plate (201) and a clamping slot (202); the clamping plate (201) is U-shaped; the clamping slot (202) is arranged on both sides of the clamping plate (201); the front end of the clamping slot (202) is a slope (203) structure; and the clamping slot (202) can be clamped in the hollow portion in the middle of the steel plate (6).

5. A connection device for preventing posterior displacement of artificial vertebrae in anterior cervical surgery according to claim 1, characterized in that: The distal end (1), the proximal end (2) and the middle part (3) are made of titanium alloy, ceramic or polymer material.

6. The connecting device for preventing posterior displacement of artificial vertebrae in anterior cervical surgery according to any one of claims 1 to 4, characterized in that: The middle part (3) comprises a screw (301), a sleeve (302) and a locking device (4); the screw (301) is rotatably connected to the U-shaped bottom of the clamping plate (201) at the proximal end (2); the sleeve (302) is fixed to the distal end (1); the screw (301) is screwed into the sleeve (302) through a thread; and the locking device (4) fixes the screw (301).

7. A connection device for preventing posterior displacement of artificial vertebrae in anterior cervical surgery according to claim 6, characterized in that: The locking device (4) comprises a locking pin (401) and a locking groove (403); one end of the locking pin (401) is connected to the U-shaped bottom of the clamping plate (201) via a rotating shaft; a protruding locking point (402) is provided at the end of the locking pin (401) away from the rotating shaft; the clamping groove (202) is evenly arranged around the nut of the screw (301); and the locking point (402) can be clamped into the locking groove (403).

8. The connecting device for preventing posterior displacement of artificial vertebrae in anterior cervical surgery according to any one of claims 1 to 4, characterized in that: The distal end (1), the proximal end (2) and the middle part (3) are integrally formed.

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