Posterior spinal fusion device

Abstract

The present invention provides a posterior spinal fusion device, comprising: a baffle member; two opposite sides of the baffle member are respectively a ventral side of the baffle and a dorsal side of the baffle, the baffle member is bent into an arc-shaped structure, and a baffle portion recess is formed on the ventral side of the baffle; a support member comprises a support body and a protrusion, two opposite sides of the support body are respectively a ventral side of the support and a dorsal side of the support, the ventral side of the support is connected to the dorsal side of the baffle of the baffle member, the trapezoidal surface of the dorsal side of the support, the ventral side of the support is an arc-shaped surface, and the support portion recess formed on the ventral side of the support faces the baffle member; the protrusion is connected to the dorsal side of the support of the support body; the support member is a trabecular structure; a connecting plate passes through the protrusion, and the connecting plate is connected to the protrusion, and mounting holes are provided on both ends of the connecting plate. The posterior spinal fusion device of the present invention can protect the spinal cord and dura mater sac, and can also be conducive to the growth of new bone cells.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to a posterior spinal fusion device. Background Art

[0002] After posterior lumbar surgery, the posterior column structure of the spine is damaged, the spine is unstable, and the spinal cord and dura mater sac are exposed to the outside because they lose the protection of the vertebral lamina, which makes them easily adhere to the surrounding tissues. At present, after laminectomy, implanting an artificial lamina can prevent adhesion and spinal instability caused by surgery, but the existing artificial lamina are mostly dense structures, which are not conducive to the growth of new bone cells. How to design a structure that can protect the spinal cord and dura mater sac and facilitate the growth of new bone cells is a problem that technicians in this field need to solve. Summary of the invention

[0003] In view of the above-mentioned shortcomings of the prior art, the technical problem solved by the present invention is to provide a posterior spinal fusion device that can protect the spinal cord and dura mater sac and facilitate the growth of new bone cells.

[0004] To achieve the above-mentioned purpose and other related purposes, the present invention provides a posterior spinal fusion device, comprising: a baffle member, a support member and a connection plate;

[0005] The two opposite sides of the baffle member are respectively a baffle ventral side and a baffle dorsal side, the baffle member is bent into an arc-shaped structure, and a baffle portion notch is formed on the baffle ventral side;

[0006] The support member comprises a support body and a protrusion, wherein two opposite sides of the support body are respectively a support ventral side and a support dorsal side, the support ventral side is connected to the baffle dorsal side of the baffle member, the support dorsal side is a trapezoidal surface, the support ventral side is an arcuate surface, and the support portion recess formed on the support ventral side faces the baffle member; the protrusion is connected to the support dorsal side of the support body; the support member is a trabecular structure;

[0007] The connecting plate passes through the protruding body, and the connecting plate is connected to the protruding body, and mounting holes are arranged on both ends of the connecting plate.

[0008] Preferably, the porosity of the trabecular structure is 55-70%, and the average diameter of the pores on the trabecular structure is 400-500 μm.

[0009] Preferably, the dorsal side surface of the support includes a support portion plane and two inclined planes, two oppositely arranged connecting side edges of the support portion plane are respectively connected to the two inclined planes, and the angles between the two inclined planes and the support portion plane are equal; a vertical plane perpendicular to the support portion plane and equidistant from the two connecting side edges is a middle plane; the posterior spinal fusion device is a structure symmetrically arranged with the middle plane as the central axis.

[0010] Preferably, the radius of the supporting ventral side is equal to the radius of the baffle back side.

[0011] Preferably, the diameter of the ventral side of the baffle is not less than the maximum diameter of the inner wall of the spinal canal.

[0012] Preferably, the material of the posterior spinal fusion device is a metal material, an inorganic material or a polymer material.

[0013] Preferably, the posterior spinal fusion device is an integrally formed structure.

[0014] As described above, the posterior spinal fusion device of the present invention has the following beneficial effects:

[0015] After posterior lumbar surgery, the posterior spinal fusion device is inserted at the position where the vertebral plate is lost, with the ventral side of the baffle plate facing the abdomen. The baffle plate can protect the dura mater sac and the spinal cord to prevent adhesion; the support member is a trabecular structure, and the holes in the trabecular structure are used for the implanted bones to grow into, so as to achieve fusion of the posterior spinal fusion device and the vertebral body; the two mounting holes of the connecting plate can be respectively equipped with clamping members for clamping the connecting rod; the posterior spinal fusion device of the present invention can protect the spinal cord and the dura mater sac, and can also be conducive to the growth of new bone cells. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the three-dimensional structure of the clamping member installed on the posterior spinal fusion device of this embodiment, when the clamping member clamps the connecting rod.

[0017] Figure 2 It is a schematic diagram of the three-dimensional structure of one side of the protruding body of the posterior spinal fusion device of this embodiment when the clamping member is installed on the posterior spinal fusion device and the clamping member does not clamp the connecting rod.

[0018] Figure 3 The figure shows a top view of the three-dimensional structure of the posterior spinal fusion device of this embodiment in which a clamp is installed and the clamp does not clamp the connecting rod.

[0019] Figure 4 It is a schematic diagram of the three-dimensional structure of the ventral side surface of the baffle member when the clamping member is installed on the posterior spinal fusion device of this embodiment and the clamping member does not clamp the connecting rod.

[0020] Figure 5 Shown is a schematic diagram of the three-dimensional structure of the posterior spinal fusion device of this embodiment.

[0021] Figure 6 Shown is a schematic diagram of the top view of the posterior spinal fusion device of this embodiment.

[0022] Figure 7 Shown is a schematic diagram of the three-dimensional structure of a hexahedral hollow frame unit of the posterior spinal fusion device of this embodiment.

[0023] Description of Figure Numbers

[0024] 100 Baffle

[0025] 110 Ventral side of baffle

[0026] 120 Baffle back side

[0027] 130 Baffle notch

[0028] 200 Support body

[0029] 210 Support ventral side

[0030] 220 Support back side

[0031] 221 Support plane

[0032] 222 Inclined plane

[0033] 223 Connect the side

[0034] 240 Support notch

[0035] 300 connection plate

[0036] 310 Mounting holes

[0037] 400 Clamping parts

[0038] 410 Clamping groove

[0039] 500 Connecting rod

[0040] 600 Protrusion

[0041] 700 Pedicle Screw

[0042] 800 Hexahedral Hollow Frame Unit

[0043] 810 Support Beam

[0044] 820 Holes in trabecular bone structure

[0045] 10 Gap DETAILED DESCRIPTION

[0046] The following is a description of the implementation of the present invention by means of specific embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0047] Please refer to the attached drawings. It should be noted that the structures, proportions, sizes, etc. illustrated in the attached drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so they have no substantial technical significance. Any modification of the structure, change in the proportional relationship, or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the effects and purposes that can be achieved by the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the present invention. The change or adjustment of their relative relationship should also be regarded as the scope of the implementation of the present invention without substantially changing the technical content.

[0048] like Figures 1 to 7 As shown, the posterior spinal fusion device of this embodiment includes: a baffle member 100, a support member and a connecting plate 300;

[0049] The two opposite sides of the baffle member 100 are respectively a baffle ventral side 110 and a baffle back side 120 . The baffle member 100 is bent into an arc-shaped structure, and a baffle portion notch 130 is formed on the baffle ventral side 110 .

[0050] The support member includes a support body 200 and a protrusion 600. The two opposite sides of the support body 200 are a support ventral side 210 and a support dorsal side 220. The support ventral side 210 is connected to the baffle dorsal side 120 of the baffle member 100. The support dorsal side 220 is a trapezoidal surface, and the support ventral side 210 is an arc surface. The support portion recess 240 formed on the support ventral side 210 faces the baffle member 100. The protrusion 600 is connected to the support dorsal side 220 of the support body 200. The support member is a trabecular structure.

[0051] The connecting plate 300 passes through the protruding body 600 , and the connecting plate 300 is connected to the protruding body 600 . Both ends of the connecting plate 300 are provided with mounting holes 310 .

[0052] After posterior lumbar surgery, the posterior spinal fusion device is inserted at the position where the vertebral plate is lost, which can stabilize the spine. The ventral side 110 of the baffle member 100 faces the abdomen, and the baffle member 100 can protect the dura mater sac and the spinal cord to prevent adhesion; the baffle member 100 is a solid; the support member is a trabecular structure, and the holes in the trabecular structure are used for the implanted bones to grow into, so as to realize the fusion of the posterior spinal fusion device and the vertebral body; the connecting plate 300 passes through the protrusion 600, and the connecting plate 300 is connected to the protrusion 600, so the support member is stably connected to the connecting plate 300, and the rigidity of the trabecular structure can be increased.

[0053] When the spinal posterior fusion device is installed, the two mounting holes 310 of the connection plate 300 can be respectively installed with the clamping member 400, and the two connecting rods 500 are respectively inserted into the clamping grooves 410 of the clamping member 400, and the upper ends of the two connecting rods 500 are connected to the vertebral plate above the spinal posterior fusion device through pedicle screws 700, and the lower ends of the two connecting rods 500 are connected to the vertebral plate below the spinal posterior fusion device through pedicle screws 700, and the clamping member 400 and the connecting rod 500 constitute a spinal internal fixation system. The spinal posterior fusion device of the present invention can protect the spinal cord and the dura mater sac, and can be conducive to the growth of new bone cells. The implanted bone is autologous bone or allogeneic bone. Because too much autologous bone will bring additional harm to the patient, too much implantation of allogeneic bone will easily cause inflammatory or allogeneic rejection reaction, resulting in surgical failure. The support member in this embodiment is a trabecular structure, so a large amount of bone implantation is not required, and a good osteogenesis effect can be achieved. The upper and lower parts of the support member are overlapped on the adjacent vertebral plates and the roots of the spinous processes, respectively, and the bone required for implantation is filled from the supporting dorsal side 220 of the support member.

[0054] The porosity of the trabecular structure is 55-70%, and the average diameter of the pores 820 on the trabecular structure is 400-500 μm. This makes the elastic modulus of the support close to that of human bones, thereby improving the fusion rate of the implanted bone and the permanent stability of the vertebral body.

[0055] In this embodiment, the trabecular structure includes a plurality of hexahedral hollow frame units 800; two adjacent hexahedral hollow frame units 800 are connected, and the hexahedral hollow frame unit 800 is a hollow structure surrounded by 12 support beams 810. The holes 820 on the trabecular structure are holes on each face of the hexahedral hollow frame unit 800, and the average diameter of the holes 820 on the trabecular structure is the average diameter of the inscribed circle of the holes on each face of the hexahedral hollow frame unit 800.

[0056] The supporting dorsal surface 220 includes a supporting portion plane 221 and two inclined planes 222. Two oppositely arranged connecting side edges 223 of the supporting portion plane 221 are respectively connected to the two inclined planes 222, and the angles between the two inclined planes 222 and the supporting portion plane 221 are equal; a vertical plane perpendicular to the supporting portion plane 221 and equidistant from the two connecting side edges 223 is a middle plane; the posterior spinal fusion device is a symmetrically arranged structure with the middle plane as the central axis, so the structure of the posterior spinal fusion device is more compact and easy to process.

[0057] When each connecting rod 500 is inserted into the clamping groove 410 of the clamping member 400, there is a gap 10 between each connecting rod 500 and the support member, and the gap 10 is 2-3 mm. By filling the gap 10 with bone grafting material, the support member and the connecting rod 500 can be fused together.

[0058] The radius of the supporting ventral side 210 is equal to the radius of the baffle dorsal side 120. This structure makes the structure of the posterior spinal fusion device more compact.

[0059] The diameter of the ventral side surface 110 of the baffle is not less than the maximum diameter of the inner wall of the spinal canal. This structure is beneficial for the baffle member 100 to block the dura mater sac and the spinal cord.

[0060] The material of the posterior spinal fusion device is a metal material, an inorganic material or a polymer material. In order to facilitate the implantation of the main component into the human body and be harmless to the human body, the metal material is titanium or tantalum. The polymer material can be polyetheretherketone. The inorganic material is bioceramics.

[0061] In order to facilitate processing, the posterior spinal fusion device is an integrated structure. The posterior spinal fusion device is manufactured using 3D printing technology.

[0062] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A posterior spinal fusion device, characterized in that: include: It comprises a baffle member (100), a support member and a connecting plate (300); The two opposite sides of the baffle member (100) are respectively a baffle ventral side (110) and a baffle dorsal side (120); the baffle member (100) is bent into an arc-shaped structure, and a baffle portion notch (130) is formed on the baffle ventral side (110); The support member comprises a support body (200) and a protrusion (600); two opposite side surfaces of the support body (200) are respectively a support ventral side surface (210) and a support dorsal side surface (220); the support ventral side surface (210) is connected to the baffle dorsal side surface (120) of the baffle member (100); the support dorsal side surface (220) is a trapezoidal surface, the support ventral side surface (210) is an arcuate surface, and a support portion recess (240) formed on the support ventral side surface (210) faces the baffle member (100); the protrusion (600) is connected to the support dorsal side surface (220) of the support body (200); the support member is a trabecular structure; The connecting plate (300) passes through the protruding body (600), and the connecting plate (300) is connected to the protruding body (600), and mounting holes (310) are provided on both ends of the connecting plate (300); The supporting dorsal surface (220) comprises a supporting portion plane (221) and two inclined planes (222); two oppositely arranged connecting side edges (223) of the supporting portion plane (221) are respectively connected to the two inclined planes (222); the angles between the two inclined planes (222) and the supporting portion plane (221) are equal; a vertical plane perpendicular to the supporting portion plane (221) and equidistant from the two connecting side edges (223) is a middle plane; the posterior spinal fusion device is a structure symmetrically arranged with the middle plane as the central axis.

2. The posterior spinal fusion device according to claim 1, characterized in that: The porosity of the trabecular structure is 55-70%, and the average diameter of the pores (820) on the trabecular structure is 400-500 μm.

3. The posterior spinal fusion device according to claim 1, characterized in that: The radius of the supporting ventral side surface (210) is equal to the radius of the baffle back side surface (120).

4. The posterior spinal fusion device according to claim 1, characterized in that: The diameter of the ventral side surface (110) of the baffle is not less than the maximum diameter of the inner wall of the spinal canal.

5. The posterior spinal fusion device according to claim 1, characterized in that: The material of the posterior spinal fusion device is metal material, bioceramic inorganic material or polymer material.

6. The posterior spinal fusion device according to claim 1, characterized in that: The posterior spinal fusion device is an integrally formed structure.

Images