Vertebral endplate punch

Abstract

The present invention provides a vertebral endplate puncher, which belongs to the field of medical devices, and includes an insertion rod, a shell, a nail plate and a pushing mechanism. The shell is arranged at the front end of the insertion rod, and the shell wall includes a nail exit area with a nail hole, and the shell is used to be inserted into the bone grafting cavity of a cone fusion device, and the nail hole faces the vertebral endplate. The nail plate is arranged in the shell, and a nail head for passing through the corresponding nail hole is arranged on the side corresponding to and facing the nail exit area. The pushing mechanism is arranged on the insertion rod, and is used to push the nail plate close to the corresponding nail exit area so that the nail head passes through the nail hole. Compared with the prior art, when the vertebral endplate puncher of the present invention is used, the vertebral fusion device can be implanted between two vertebrae first, and then the insertion rod is used to extend the shell into the bone grafting cavity, and the nail head is passed through the nail hole and the nail hole is pierced on the endplate of the vertebrae by the pushing mechanism, thereby ensuring that the punching area on the endplate is completely consistent with the opening of the bone grafting cavity, so that the operation achieves a better effect.

Description

Technical Field

[0001] The invention belongs to the technical field of medical instruments, and more specifically, relates to a vertebral end plate puncher. Background Art

[0002] In the field of spinal surgery, the use of a vertebral fusion device for spinal segment fusion is one of the most widely used treatment methods for degenerative spondylolisthesis, traumatic spondylolisthesis, segmental instability, disc-related low back pain, acute disc herniation with spinal cord or nerve damage, old spinal injury with spinal cord compression, etc. The vertebral fusion device has the functions of support, compression resistance, and load distribution. It can better restore the intervertebral space height and the physiological curvature of the spine. At the same time, reliable bone fusion can be obtained by implanting autologous or allogeneic bone particles. Its clinical efficacy has been confirmed by a large number of clinical studies.

[0003] At present, in order to accelerate the fusion of the vertebral body and the main body of the intervertebral fusion device, several small holes are often punctured on the end plate of the vertebral body during surgery so that the end plate can be more quickly combined with the filler in the bone graft cavity of the intervertebral fusion device, thereby accelerating the fusion of the vertebral body and the main body of the intervertebral fusion device. However, the general operation method now is to puncture and punch holes in the end plate of the vertebral body before implanting the main body of the intervertebral fusion device. This method is difficult to control the shape of the punching area to completely match the opening of the bone graft cavity of the fusion device, which easily causes the punching area to be too large or the area of ​​the end plate punching area to be insufficient, and the best surgical effect cannot be achieved. Summary of the invention

[0004] The purpose of the present invention is to provide a vertebral endplate puncher to solve the technical problem in the prior art that it is difficult to control the endplate punching area to be completely consistent with the area of ​​the vertebral fusion device bone grafting cavity, which easily causes the punching area to be too large or the area of ​​the endplate punching area to be insufficient.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is: to provide a vertebral endplate puncher, comprising:

[0006] Insertion of rods;

[0007] A shell is arranged at the front end of the insertion rod, the shell wall includes a nail exit area with a nail hole, and the shell is used to be inserted into the bone grafting cavity of the cone fusion device with the nail hole facing the vertebral end plate;

[0008] A nail plate is disposed in the housing, and a nail head for passing through the corresponding nail hole is disposed on a side corresponding to the nail-exiting area and facing the nail-exiting area; and

[0009] The pushing mechanism is arranged on the insertion rod and is used for pushing the nail plate to approach the corresponding nail outlet area so that the nail head can pass through the nail hole.

[0010] Furthermore, the two opposite side walls of the shell are respectively provided with the nail outlet areas; the nail plates have two and correspond one to one with the two nail outlet areas; the pushing mechanism is arranged between the two nail plates, and is used to push and spread the two nail plates so that the nail heads on each nail plate can pass through the corresponding nail holes.

[0011] Furthermore, the driving mechanism comprises:

[0012] A push-pull member, which is inserted into the insertion rod and has the freedom to slide along the axial direction of the insertion rod; and

[0013] The support block is arranged in the shell and connected to the push-pull member. It is provided with an impact support cone surface whose axis is parallel to the sliding direction of the push-pull member. The nail plate is in sliding contact with the impact support cone surface.

[0014] Furthermore, the push-pull member is a push rod, the front end of which is connected to the support block, the rear end of which protrudes from the rear end of the insertion rod and is provided with a hammer head, and the small end of the impact support cone is oriented in the same direction as the front end of the push rod.

[0015] Furthermore, the expansion block includes a first expansion section connected to the front end of the ejection rod, and the front end surface of the first expansion section is the impact expansion cone surface; the side of the nail plate away from the corresponding nail output area is provided with a back convex portion, and the back convex portion is provided with a first expansion inclined surface that fits and slides with the impact expansion cone surface.

[0016] Furthermore, a return spring is provided between the expansion block and the housing, and the return spring is used to push the expansion block to move toward the insertion rod.

[0017] Furthermore, the expansion block further comprises:

[0018] a contraction section connected to a front end of the first expansion section; and

[0019] A second expansion section is connected to the front end of the contraction section, and the rear end surface of the second expansion section is a restoring expansion cone surface with a small end protruding;

[0020] An accommodating groove for accommodating the back convex portion is formed between the impact opening cone surface, the outer peripheral surface of the contraction section and the return opening cone surface, and the back convex portion is provided with a second opening inclined surface that fits and slides with the return opening cone surface.

[0021] Furthermore, the nail plate is provided with an elastic portion for abutting against the corresponding nail-exiting area, and the elastic portion is used to push the nail plate away from the corresponding nail-exiting area so that the nail head is retracted from the nail hole.

[0022] Furthermore, the edge of the nail plate is bent close to the corresponding nail outlet area to form the elastic portion.

[0023] Furthermore, each of the nail outlet areas is provided with a plurality of nail holes, and the nail heads on each of the nail plates correspond one-to-one to the nail holes of the corresponding nail outlet areas, and the nail heads are slidably inserted into the corresponding nail holes.

[0024] The beneficial effect of the vertebral endplate punch provided by the present invention is that compared with the prior art, when the vertebral endplate punch of the present invention is used, the vertebral fusion device can be first implanted between the two vertebrae using an implantation tool, and then the shell can be extended into the bone graft cavity through the operating channel of the implantation tool using an insertion rod, and the nail hole is kept facing the vertebral endplate, and the nail plate is pushed close to the corresponding nail exit area through a pushing mechanism, so that the nail head passes through the nail hole, thereby piercing a small hole in the endplate of the vertebral body, and the operation is repeated in the bone graft cavity, thereby ensuring that the punching area on the endplate is completely consistent with the opening of the bone graft cavity, so that the operation achieves a better effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0026] Figure 1 A three-dimensional diagram of a disassembled state of a vertebral endplate puncher provided in an embodiment of the present invention;

[0027] Figure 2 for Figure 1 The enlarged view of point A in the middle;

[0028] Figure 3 A cross-sectional view of the interior of a housing of a vertebral endplate puncher provided in an embodiment of the present invention;

[0029] Figure 4 A three-dimensional diagram of a vertebral fusion device that can be used in conjunction with the vertebral endplate puncher of an embodiment of the present invention;

[0030] Figure 5 for Figure 4 A stereoscopic diagram of the assembly of the vertebral fusion device and the implantation tool that can be used in conjunction with the vertebral endplate puncher of the embodiment of the present invention.

[0031] Among them, the reference numerals in the figure are:

[0032] 1-insertion rod; 2-shell; 21-nail hole; 22-nail extraction area; 3-nail plate; 31-nail head; 32-dorsal convex part; 33-elastic part; 4-pushing mechanism; 41-push rod; 411-hammer head; 42-expansion block; 421-first expansion section; 422-impact expansion cone; 423-contraction section; 424-second expansion section; 425-restoration expansion cone; 43-restoration spring; 5-fusion device body; 51-bone graft cavity; 52-filling entrance; 53-first connecting structure; 6-tool body; 61-second connecting structure. DETAILED DESCRIPTION

[0033] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0034] Please also read Figures 1 to 3 The vertebral endplate puncher provided by the embodiment of the present invention is now described. A vertebral endplate puncher comprises an insertion rod 1, a housing 2, a nail plate 3 and a pushing mechanism.

[0035] The shell 2 is arranged at the front end of the insertion rod 1, and the shell wall includes a nail exit area 22 with a nail hole 21. The shell 2 is used to be inserted into the bone grafting cavity 51 of the cone fusion device, and the nail hole 21 faces the vertebral end plate.

[0036] The nail plate 3 is arranged in the housing 2 , and a nail head 31 for passing through the corresponding nail hole 21 is provided on a side corresponding to the nail exiting area 22 and facing the nail exiting area 22 .

[0037] The pushing mechanism is disposed on the insertion rod 1 , and is used to push the nail plate 3 to approach the corresponding nail exiting area 22 so that the nail head 31 passes through the nail hole 21 .

[0038] Compared with the prior art, the vertebral endplate puncher of the embodiment of the present invention can be used to implant the vertebral fusion device between the two vertebrae using an implantation tool, and then use the insertion rod 1 to extend the shell 2 into the bone graft cavity 51 through the operating channel of the implantation tool, and keep the nail hole 21 facing the vertebral endplate. The pushing mechanism pushes the nail plate 3 close to the corresponding nail outlet area 22, so that the nail head 31 passes through the nail hole 21, thereby piercing a small hole in the endplate of the vertebral body, and repeatedly operating in the bone graft cavity 51, thereby ensuring that the punching area on the endplate is completely consistent with the opening of the bone graft cavity 51, so that the operation achieves a better effect.

[0039] Specifically, the insertion rod 1 can be a long straight rod, which is used to pass the shell 2 through the operating channel into the bone graft cavity 51. The rear end of the insertion rod 1 can be provided with a gripping handle for holding, which is convenient for operation. The shell 2 can be in the shape of a rectangular parallelepiped, which is fixed to the front end of the insertion rod 1 and has a cavity inside. The volume of the shell 2 is smaller than the volume of the bone graft cavity 51 of the conical fusion device, so that the shell 2 can be inserted into the bone graft cavity 51 of the conical fusion device, and the nail hole 21 faces the vertebral end plate. The local area on the shell wall on one side of the shell 2 is evenly provided with nail holes 21 to form a nail outlet area 22; or the shell wall on one side of the shell 2 can be completely and evenly covered by the nail holes 21 to form a nail outlet area 22. The nail plate 3 is located inside the shell 2 and is parallel to the nail outlet area 22. The plate surface of the nail plate 3 facing the nail outlet area 22 is provided with a nail head 31. The pushing mechanism is arranged on the insertion rod 1, which is convenient for the operator to operate. The pushing mechanism presses the nail plate 3 toward the nail exit area 22, so that the nail head 31 passes through the nail hole 21 and punctures a small hole on the end plate of the vertebral body. More specifically, the outer wall surface of the nail exit area 22 is parallel to the axis of the insertion rod 1, which is convenient for the operator to hold the insertion rod 1 for operation.

[0040] During use, the vertebral fusion device and implantation tool used may have the following structures.

[0041] See also Figure 4 The vertebral fusion cage may include a fusion cage body 5 and a first connecting structure 53 .

[0042] The fusion device body 5 is used to be implanted between two vertebrae, and is provided with two abutting end faces and a front side face respectively used to abut the two vertebrae. The fusion device body 5 is provided with a bone grafting cavity 51 that passes through the two abutting end faces. The front side face of the fusion device body 5 is provided with a filling port 52 that is connected to the bone grafting cavity 51. The filling port 52 is used to allow a bone file to enter the bone grafting cavity 51.

[0043] The first connection structure 53 is disposed on the fusion device body 5 and is used for detachable connection with the implantation tool and for communicating the filling port 52 with the docking port of the implantation tool.

[0044] Specifically, after the fusion device body 5 is implanted on the spine, the upper and lower ends of the fusion device body 5 are respectively used to abut against two vertebrae, and the upper and lower end surfaces of the fusion device body 5 are respectively abutment end surfaces. The bone grafting cavity 51 penetrates the fusion device body 5 in the up-down direction, and the front side of the bone grafting cavity 51 is open on the front side of the fusion device body 5 to form a filling port 52 that allows a vertebral endplate puncher to enter. Overall, the fusion device body 5 with the bone grafting cavity 51 can be U-shaped. The size of the filling port 52 can be set to allow the shell 2 of the vertebral endplate puncher to pass through. The vertebral endplate puncher is used to punch a small hole in the endplate of the vertebral body to facilitate the fusion of the filler in the bone grafting cavity 51 with the vertebral endplate.

[0045] The first connection structure 53 is detachably connected to the implantation tool by a detachable connection such as a clamping connection or a threaded connection. After the first connection structure 53 is connected to the implantation tool, the docking port of the implantation tool is communicated with the filling port 52 on the fusion device body 5 .

[0046] See also Figure 5 The implantation tool may include a tool body 6 and a second connecting structure 61 .

[0047] The tool body 6 is provided with an operation channel penetrating through both ends and used for the vertebral end plate punch to pass through, and the operation channel forms an insertion port and a docking port on both end surfaces of the tool body 6 respectively.

[0048] The second connection structure 61 is disposed on the tool body 6 and is used to be detachably connected to the first connection structure 53 of the vertebral fusion device and to connect the docking port with the filling port 52 of the vertebral fusion device.

[0049] More specifically, the tool body 6 may be in the shape of a long straight tube, the inner cavity of which forms an operation channel, and the vertebral fusion device is fixed to the front end of the tool body 6 through the second connecting structure 61. When in use, the rear end of the tool body 6 can be held, and the vertebral fusion device can be implanted between the two vertebrae through the front end of the tool body 6. The cross-sectional shape of the operation channel may be the same as the shape of the filling port 52, or the cross-sectional shape of the operation channel may be slightly larger than the filling port 52, so that more tools can pass through the operation channel and enter the bone graft cavity 51 from the filling port 52. The cross-sectional size of the operation channel may be set to allow the shell 2 of the vertebral endplate punch and the insertion rod 1 to pass through.

[0050] Please also read Figure 2 and Figure 3 As a specific embodiment of the vertebral endplate puncher provided by the present invention, the two opposite side walls of the housing 2 are respectively provided with nail outlet areas 22; the nail plates 3 have two and correspond to the two nail outlet areas 22 one by one; the pushing mechanism is arranged between the two nail plates 3, and is used to push and spread the two nail plates 3 so that the nail head 31 on each nail plate 3 passes through the corresponding nail hole 21. With this arrangement, holes can be punched on the endplates of the upper and lower vertebral plates at the same time, thereby improving the operation efficiency.

[0051] Specifically, nail holes 21 are provided on the shell walls on the upper and lower sides of the shell 2, thereby forming nail outlet areas 22 on the shell walls on the upper and lower sides of the shell 2. The two nail plates 3 are parallel to the upper and lower nail outlet areas 22, respectively, and each nail plate 3 is provided with a nail head 31 on one side facing the corresponding nail outlet area 22, so that the nail head 31 of each nail plate 3 can face the nail holes 21 of the upper and lower nail outlet areas 22. The pushing mechanism 4 is located between the two nail plates 3, and by spreading the two nail plates 3 apart, the two nail plates 3 are respectively close to their respective corresponding nail outlet areas 22, so that the nail head 31 passes through.

[0052] Please also read Figure 2 and Figure 3 As a specific embodiment of the vertebral endplate puncher provided by the present invention, the pushing mechanism 4 includes a push-pull member and a spreading block 42 .

[0053] The push-pull member is inserted into the insertion rod 1 and has the freedom to slide along the axial direction of the insertion rod. The expansion block 42 is arranged in the housing 2 and connected to the push-pull member, and is provided with an impact expansion cone surface 422 whose axis is parallel to the sliding direction of the push-pull member, and the nail plate 3 slides against the impact expansion cone surface 422.

[0054] The operator can hold the insertion rod 1 and drive the expansion block 42 to move by pushing or pulling the push-pull member. During the movement of the expansion block 42, the expansion cone surface 422 is impacted to push the nail plate 3 toward the corresponding nail outlet area 22, so that the nail head 31 passes through the corresponding nail hole 21.

[0055] Specifically, the two nail plates 3 sandwich the impact-opening cone surface 422 in the middle. When the push-pull member drives the opening block 42 to move, the two nail plates 3 slide along the impact-opening cone surface 422 toward the corresponding nail output area 22 respectively, thereby being opened.

[0056] Please also read Figure 2 and Figure 3 As a specific embodiment of the vertebral endplate puncher provided by the present invention, the push-pull member is a push rod 41, the front end of the push rod 41 is connected to the expansion block 42, the rear end of the push rod 41 protrudes from the rear end of the insertion rod 1 and is provided with a hammer head 411, and the small end of the impact expansion cone 422 is in the same direction as the front end of the push rod 41.

[0057] Specifically, the insertion rod 1 is provided with through holes penetrating the front and rear ends, the push-pull member is slidably inserted into the through holes, the rear end of the insertion rod 1 is provided with a gripping handle, the opening block 42 is fixed to the front end of the ejection rod 41, and the opening block 42 is provided with an impact opening cone surface 422 which is coaxial with the ejection rod 41 and has a small end facing forward. The two nail plates 3 sandwich the opening block 42 in the middle and slide against the impact opening cone surface 422 respectively.

[0058] When in use, the operator holds the gripping handle and uses a hammer or other tool to strike the hammer head 411 at the rear end of the ejector rod 41, so that the ejector rod 41 pushes the expansion block 42 forward, and the impact expansion cone surface 422 at the front end of the expansion block 42 expands the two nail plates 3.

[0059] Please also read Figure 2 and Figure 3As a specific embodiment of the vertebral endplate puncher provided by the present invention, the expansion block 42 includes a first expansion section 421 connected to the front end of the push rod 41, and the front end surface of the first expansion section 421 is an impact expansion cone 422; a back convex portion 32 is provided on the side of the nail plate 3 away from the corresponding nail outlet area 22, and the back convex portion 32 is provided with a first expansion inclined surface that fits and slides with the impact expansion cone 422.

[0060] Specifically, the first expansion section 421 is a cylindrical shape coaxially arranged at the front end of the ejector rod 41, and the coaxial conical surface at the front end of the first expansion section 421 is the impact expansion cone surface 422. The nail plate 3 increases the contact area with the impact expansion cone surface 422 through the first expansion inclined surface of the back convex part 32, reduces friction, and increases service life.

[0061] Please also read Figure 2 and Figure 3 As a specific embodiment of the vertebral endplate puncher provided by the present invention, a return spring 43 is provided between the expansion block 42 and the housing 2 , and the return spring 43 is used to push the expansion block 42 to move toward the insertion rod 1 .

[0062] Specifically, the return spring 43 is located between the front end of the support block 42 and the shell wall on the front side of the shell 2. When the operator uses a tool such as a hammer to hit the hammer head 411 at the rear end of the ejector rod 41, the ejector rod 41 pushes the support block 42 forward, and the support block 42 compresses the return spring 43. When the ejector rod 41 is not under force, the elastic force of the return spring 43 pushes the support block 42 in the opposite direction, causing the support block 42 to move backward.

[0063] Please also read Figure 2 and Figure 3 As a specific embodiment of the vertebral endplate puncher provided by the present invention, the expansion block 42 also includes a contraction section 423 and a second expansion section 424 .

[0064] The contraction section 423 is connected to the front end of the first expansion section 421. The second expansion section 424 is connected to the front end of the contraction section 423, and the rear end surface of the second expansion section 424 is a small end protruding recovery expansion cone surface 425.

[0065] An accommodating groove for accommodating the back convex portion 32 is formed between the impact expansion cone surface 422 , the outer circumference of the contraction section 423 and the return expansion cone surface 425 . The back convex portion 32 is provided with a second expansion inclined surface that fits and slides with the return expansion cone surface 425 .

[0066] Specifically, the ejector rod 41, the first expansion section 421, the contraction section 423 and the second expansion section 424 are coaxially arranged from back to front, and the diameter of the first expansion section 421 and the second expansion section 424 is larger than the diameter of the contraction section 423, so that the end surface of the front end of the first expansion section 421 forms a conical impact expansion cone surface 422, and the end surface of the rear end of the second expansion section 424 forms a conical return expansion cone surface 425. The two nail plates 3 sandwich the expansion block 42 in the middle, and are respectively provided with a back convex portion 32. The cross section of the back convex portion 32 is trapezoidal, and the sides where the two waists of the trapezoid are located are the first expansion inclined surface and the second expansion inclined surface respectively.

[0067] When the return spring 43 pushes the expansion block 42 in the opposite direction to reset the expansion block 42, the expansion block 42 continues to move backward, and the return expansion cone 425 of the second expansion section 424 cooperates with the second expansion inclined surface to push the nail plate 3 toward the corresponding nail outlet area 22 again, so that the nail head 31 passes through the nail hole 21 again, thereby improving efficiency.

[0068] Please also read Figure 2 and Figure 3 As a specific embodiment of the vertebral endplate puncher provided by the present invention, an elastic portion 33 is provided on the nail plate 3 for abutting against the corresponding nail outlet area 22, and the elastic portion 33 is used to push the nail plate 3 away from the corresponding nail outlet area 22 to retract the nail head 31 from the nail hole 21.

[0069] Please also read Figure 2 and Figure 3 As a specific embodiment of the vertebral endplate puncher provided by the present invention, the edge of the nail plate 3 is bent near the corresponding nail outlet area 22 to form an elastic portion 33.

[0070] Specifically, the nail plate 3 is made of metal, and the front edge and the rear edge of the nail plate 3 are respectively bent toward the corresponding nail-out area 22 to form an elastic portion 33 with a certain elasticity. When the nail plate 3 moves close to the corresponding nail-out area 22 under the push of the pushing mechanism 4, the nail plate 3 and the nail-out area 22 squeeze and deform the bent elastic portion 33, and when the opening force of the pushing mechanism 4 disappears, the elastic portion 33 recovers to push the nail plate 3 away from the nail-out area 22, so that the nail head 31 is retracted from the nail hole 21.

[0071] Please also read Figure 2 and Figure 3 As a specific embodiment of the vertebral endplate puncher provided by the present invention, each nail outlet area 22 is provided with a plurality of nail holes 21, and the nail heads 31 on each nail plate 3 correspond to the nail holes 21 of the corresponding nail outlet area 22 one by one, and the nail heads 31 are slidably penetrated in the corresponding nail holes 21. The nail heads 31 are slidably penetrated in the corresponding nail holes 21, and the nail plates 3 can be guided.

[0072] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A vertebral endplate puncher, characterized in that: include: Insertion of rods; A shell is arranged at the front end of the insertion rod, the shell wall includes a nail exit area with a nail hole, and the shell is used to be inserted into the bone grafting cavity of the cone fusion device with the nail hole facing the vertebral end plate; A nail plate is arranged in the shell and is parallel to the nail-exiting area. A nail head for passing through the corresponding nail hole is arranged on a side corresponding to and facing the nail-exiting area. The nail plate is provided with an elastic part for abutting against the corresponding nail-exiting area. The elastic part is used to push the nail plate away from the corresponding nail-exiting area so that the nail head is withdrawn from the nail hole. The edge of the nail plate is bent close to the corresponding nail-exiting area to form the elastic part. as well as The pushing mechanism is arranged on the insertion rod and is used for pushing the nail plate to approach the corresponding nail outlet area so that the nail head can pass through the nail hole.

2. The vertebral endplate puncher according to claim 1, characterized in that: The two opposite side walls of the shell are respectively provided with the nail outlet areas; the nail plates have two and correspond one to one with the two nail outlet areas; the pushing mechanism is arranged between the two nail plates, and is used to push and spread the two nail plates so that the nail head on each nail plate can pass through the corresponding nail hole.

3. The vertebral endplate puncher according to claim 2, characterized in that: The driving mechanism comprises: A push-pull member, which is inserted into the insertion rod and has the freedom to slide along the axial direction of the insertion rod; and The support block is arranged in the shell and connected to the push-pull member. It is provided with an impact support cone surface whose axis is parallel to the sliding direction of the push-pull member. The nail plate is in sliding contact with the impact support cone surface.

4. The vertebral endplate puncher according to claim 3, characterized in that: The push-pull member is a push rod, the front end of which is connected to the support block, the rear end of which protrudes from the rear end of the insertion rod and is provided with a hammer head, and the small end of the impact support cone faces the same direction as the front end of the push rod.

5. The vertebral endplate puncher according to claim 4, characterized in that: The expansion block includes a first expansion section connected to the front end of the ejection rod, and the front end surface of the first expansion section is the impact expansion cone surface; the nail plate is provided with a back convex portion on the side away from the corresponding nail output area, and the back convex portion is provided with a first expansion inclined surface that fits and slides with the impact expansion cone surface.

6. The vertebral endplate puncher according to claim 5, characterized in that: A return spring is provided between the expansion block and the housing, and the return spring is used for pushing the expansion block to move toward the insertion rod.

7. The vertebral endplate puncher according to claim 6, characterized in that: The expansion block also includes: a contraction section connected to a front end of the first expansion section; and A second expansion section is connected to the front end of the contraction section, and the rear end surface of the second expansion section is a restoring expansion cone surface with a small end protruding; An accommodating groove for accommodating the back convex portion is formed between the impact opening cone surface, the outer peripheral surface of the contraction section and the return opening cone surface, and the back convex portion is provided with a second opening inclined surface that fits and slides with the return opening cone surface.

8. The vertebral endplate puncher according to any one of claims 1 to 7, characterized in that: Each nail-out area is provided with a plurality of nail holes, and the nail heads on each nail plate correspond one-to-one with the nail holes in the corresponding nail-out area, and the nail heads are slidably inserted into the corresponding nail holes.

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