Reciprocating file

Abstract

The present invention provides an expandable reciprocating file, which belongs to the field of medical devices and includes an insertion rod, two bone file pieces and an expansion mechanism. The file surfaces of the two bone file pieces are arranged back to back and are respectively connected to the front end of the insertion rod, and are used to be inserted into the bone grafting cavity of the cone fusion device with the file surfaces facing the vertebral end plate. The expansion mechanism is arranged on the insertion rod and located between the two bone file pieces, and is used to expand the two bone file pieces. When the expandable reciprocating file 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 two bone file pieces are extended into the bone grafting cavity through the operation channel of the implantation tool using the insertion rod of the expandable reciprocating file of the present invention, and the two bone file pieces are expanded by the expansion mechanism, so that the file surfaces of the two bone file pieces are respectively in contact with the end plates of the upper and lower vertebrae, and the end plates of the vertebrae are polished so that the polished area of ​​the end plates 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 devices, and more specifically, relates to an expandable reciprocating file. Background Art

[0002] In the field of spinal surgery, the use of vertebral fusion cages for spinal segment fusion is one of the most widely used treatments 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. Vertebral fusion cages have the functions of support, compression resistance, and load distribution. They 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 intervertebral fusion device, the end plate of the vertebral body end surface is often polished during surgery. After polishing, 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 intervertebral fusion device. However, the general operation method now is to polish the end plate of the vertebral body before implanting the intervertebral fusion device. It is difficult to control the shape of the polished area to completely match the opening of the bone graft cavity of the fusion device, which easily causes excessive polishing of the end plate or insufficient polishing of the end plate, and cannot achieve the best surgical effect. Summary of the invention

[0004] The purpose of the present invention is to provide a reciprocating file that can be expanded to solve the technical problems in the prior art that the end plates of the vertebral bodies are ground before the vertebral fusion device is implanted, and it is difficult to control the shape of the end plate grinding area to completely match the opening of the bone graft cavity, which easily causes excessive grinding of the end plate or insufficient grinding area of ​​the end plate.

[0005] To achieve the above object, the technical solution adopted by the present invention is to provide a reciprocating file that can be expanded, comprising:

[0006] Insertion of rods;

[0007] Two bone rasp blades, with rasp surfaces facing each other, are respectively connected to the front end of the insertion rod and are used to be inserted into the bone grafting cavity of the cone fusion cage with the rasp surfaces facing the vertebral end plate; and

[0008] The spreading mechanism is arranged on the insertion rod and located between the two bone rasp pieces, and is used for spreading the two bone rasp pieces apart.

[0009] Furthermore, the expansion mechanism comprises:

[0010] A wedge block is disposed between the two bone rasp pieces and has two wedge surfaces that are in sliding contact with the two bone rasp pieces respectively;

[0011] The push-pull assembly is arranged on the insertion rod and is used for pushing and pulling the wedge block to slide back and forth along the wedge angle.

[0012] Furthermore, the push-pull assembly comprises:

[0013] A push-pull rod is rotatably arranged on the insertion rod, and one end of the push-pull rod is threadedly connected with the wedge block.

[0014] Furthermore, the insertion rod is provided with a receiving hole running through both ends; the push-pull rod is rotatably inserted into the receiving hole, the front end of the push-pull rod is threadedly connected to the wedge block, and the rear end of the push-pull rod passes through the receiving hole and is provided with a knob for axially limiting the push-pull rod.

[0015] Further, the bone rasp comprises:

[0016] A file plate, one side of which is the file surface, and the other side of which is in sliding contact with the wedge surface of the wedge block; and

[0017] The elastic connecting portion is connected between the file plate and the front end of the insertion rod.

[0018] Furthermore, the wedge angle of the wedge block faces the insertion rod, and a limiting block is provided at the front end of the insertion rod for limiting the wedge block to an extreme position close to the insertion rod.

[0019] Furthermore, the insertion rod comprises:

[0020] An outer sleeve, the front end of which is respectively connected to the two bone rasp pieces; and

[0021] The inner sleeve is inserted into the outer sleeve, and the inner cavity forms the accommodating hole.

[0022] Furthermore, a clamping plate is provided on the outer periphery of the front end of the inner sleeve and is limited between the two bone rasp pieces, and the clamping plate is used to limit the rotation of the inner sleeve relative to the outer sleeve.

[0023] Furthermore, the clamping plate is located between the limiting block and the wedge block, and the limiting block limits the wedge block to an extreme position close to the insertion rod through the clamping plate.

[0024] Furthermore, a connector for connecting to a reciprocating motion device is provided at the rear end of the insertion rod.

[0025] The expandable reciprocating file provided by the present invention has the beneficial effect that, compared with the prior art, when the expandable reciprocating file of the present invention is used, an implantation tool can be used to first implant a vertebral fusion device between two vertebrae, and then an insertion rod can be used to extend two bone file pieces into the bone graft cavity through the operation channel of the implantation tool, and the two bone file pieces are expanded by the expansion mechanism so that the file surfaces of the two bone file pieces are respectively in contact with the end plates of the upper and lower vertebrae, and then the bone file pieces are moved in the bone graft cavity by the insertion rod to grind the end plates of the vertebrae, so that the grinded area of ​​the end plates is completely consistent with the opening of the bone graft cavity, so that the operation achieves a better effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] 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.

[0027] Figure 1 A three-dimensional diagram of a reciprocating file that can be expanded provided by an embodiment of the present invention;

[0028] Figure 2 for Figure 1 The enlarged view of point A in the middle;

[0029] Figure 3 A front view of a reciprocating file that can be expanded provided by an embodiment of the present invention;

[0030] Figure 4 for Figure 3 A cross-sectional view of

[0031] Figure 5 A three-dimensional diagram of a vertebral fusion device that can be used in conjunction with the expandable reciprocating file of the embodiment of the present invention;

[0032] Figure 6 for Figure 5 A stereoscopic diagram of the assembly of the vertebral fusion device and the implantation tool that can be used in conjunction with the expandable reciprocating file of the embodiment of the present invention.

[0033] Among them, the reference numerals in the figure are:

[0034] 1-insertion rod; 11-outer sleeve; 12-inner sleeve; 14-clamping plate; 15-connecting head; 2-bone rasp; 21-rasp plate; 22-elastic connecting part; 23-limiting block; 24-rasp surface; 3-spreading mechanism; 31-wedge block; 32-push-pull rod; 33-knob; 4-fusion device body; 41-bone graft cavity; 42-filling entrance; 43-first connecting structure; 5-tool body; 51-second connecting structure. DETAILED DESCRIPTION

[0035] 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.

[0036] Please also read Figures 1 to 4 The expandable reciprocating file provided by the embodiment of the present invention is now described. The expandable reciprocating file comprises an insertion rod 1, two bone file blades 2 and an expansion mechanism 3.

[0037] The file surfaces 24 of the two bone rasp blades 2 are arranged back to back and are respectively connected to the front end of the insertion rod 1 for being inserted into the bone implant cavity 41 of the pyramidal fusion cage with the file surfaces 24 facing the vertebral end plate.

[0038] The spreading mechanism 3 is arranged on the insertion rod 1 and located between the two bone rasp pieces 2, and is used for spreading the two bone rasp pieces 2 apart.

[0039] Compared with the prior art, when the expandable reciprocating file of the embodiment 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 two bone file pieces 2 can be extended into the bone graft cavity 41 through the operation channel of the implantation tool using the insertion rod 1, and the two bone file pieces 2 are expanded by the expansion mechanism 3 so that the file surfaces 24 of the two bone file pieces 2 are respectively in contact with the end plates of the upper and lower vertebrae, and then the bone file pieces 2 are moved in the bone graft cavity 41 by the insertion rod 1 to grind the end plates of the vertebrae, so that the grinded area of ​​the end plates is completely consistent with the opening of the bone graft cavity 41, so that the operation can achieve better results.

[0040] Specifically, the insertion rod 1 can be a long straight rod, which is used to send the two bone rasp pieces 2 through the operating channel into the bone grafting cavity 41. The rear end of the insertion rod 1 can be provided with a handle for holding or a connector 15 for connecting to a reciprocating motion device, and the two bone rasp pieces 2 are operated by the insertion rod 1 to grind the end plate. The expansion mechanism 3 is provided on the insertion rod 1, which is convenient for controlling the expansion mechanism 3 to expand the two bone rasp pieces 2. The rasp surface 24 is parallel to the axis of the insertion rod 1, and by setting the volume of the two bone rasp pieces 2 to be smaller than the volume of the bone grafting cavity 41 of the pyramidal fusion device, the two bone rasp pieces 2 can be inserted into the bone grafting cavity 41 of the pyramidal fusion device, and the rasp surfaces 24 of the two bone rasp pieces 2 are respectively facing the end plates of the two adjacent vertebrae.

[0041] During use, the vertebral fusion device and implantation tool used may have the following structures.

[0042] See also Figure 5 The vertebral fusion cage may include a fusion cage body 4 and a first connecting structure 43 .

[0043] The fusion device body 4 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 4 is provided with a bone grafting cavity 41 that passes through the two abutting end faces. The front side face of the fusion device body 4 is provided with a filling port 42 that is connected to the bone grafting cavity 41. The filling port 42 is used to allow a bone file to enter the bone grafting cavity 41.

[0044] The first connection structure 43 is disposed on the fusion device body 4 and is used for detachably connecting with the implantation tool and making the filling port 42 communicate with the docking port of the implantation tool.

[0045] Specifically, after the fusion device body 4 is implanted on the spine, the upper and lower ends of the fusion device body 4 are respectively used to abut against two vertebrae, and the upper and lower end surfaces of the fusion device body 4 are respectively abutment end surfaces. The bone grafting cavity 41 penetrates the fusion device body 4 in the up and down direction, and the front side of the bone grafting cavity 41 is open on the front side surface of the fusion device body 4 to form a filling port 42 that allows a reciprocating file to enter. Overall, the fusion device body 4 with the bone grafting cavity 41 can be U-shaped. The size of the filling port 42 can be set to allow two bone files 2 that can be reciprocating files to pass through, and further can be set to allow a puncher to pass through. The puncher is used to punch a small hole in the end plate of the vertebral body to facilitate the fusion of the filler in the bone grafting cavity 41 with the vertebral end plate.

[0046] The first connection structure 43 is detachably connected to the implantation tool in a detachable connection form such as a clamping connection or a threaded connection. After the first connection structure 43 is connected to the implantation tool, the docking port of the implantation tool is communicated with the filling port 42 on the fusion device body 4.

[0047] See also Figure 6 The implantation tool may include a tool body 5 and a second connecting structure 51.

[0048] The tool body 5 is provided with an operation channel which passes through both ends and is used for the expansion reciprocating file to pass through. The operation channel forms an insertion port and a docking port on both end surfaces of the tool body 5 respectively.

[0049] The second connection structure 51 is disposed on the tool body 5 and is used for being detachably connected to the first connection structure 43 of the vertebral fusion device and for communicating the docking port with the filling port 42 of the vertebral fusion device.

[0050] More specifically, the tool body 5 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 through the second connecting structure 51. When in use, the rear end of the tool body 5 can be held, and the vertebral fusion device can be implanted between the two vertebrae through the front end of the tool body 5. The cross-sectional shape of the operation channel may be the same as the shape of the filling port 42, or the cross-sectional shape of the operation channel may be slightly larger than the filling port 42, so that more tools can pass through the operation channel and enter the bone graft cavity 41 from the filling port 42. The cross-sectional size of the operation channel may be set to allow the two bone rasp blades 2 that can open the reciprocating rasp, the punch, the cover plate, the fixing rod and the unlocking protrusion, the locking screw, etc. to pass through.

[0051] Please also read Figures 2 to 4 As a specific embodiment of the expandable reciprocating file provided by the present invention, the expansion mechanism 3 includes a wedge block 31 and a push-pull assembly.

[0052] The wedge block 31 is disposed between the two bone rasp pieces 2 and the two wedge surfaces are respectively in sliding contact with the two bone rasp pieces 2. The push-pull assembly is disposed on the insertion rod 1 and is used to push and pull the wedge block 31 to slide back and forth along the wedge angle.

[0053] The wedge block 31 is pushed upward in the wedge angle direction by the push-pull assembly, so that the two bone rasp pieces 2 slide relatively along the two wedge surfaces respectively, so that the wedge block 31 spreads the two bone rasp pieces 2 apart.

[0054] Please also read Figure 4 As a specific embodiment of the reciprocating file that can be expanded provided by the present invention, the push-pull assembly includes a push-pull rod 32. The push-pull rod 32 is rotatably arranged on the insertion rod 1, and one end is threadedly connected with the wedge block 31. By utilizing the threaded connection between the push-pull rod 32 and the wedge block 31, the wedge block 31 is driven to move by rotating the push-pull rod 32.

[0055] Specifically, the wedge angle of the wedge block 31 is parallel to the axis of the push-pull rod 32. The wedge angle of the wedge block 31 is an acute angle.

[0056] Please also read Figure 4 As a specific embodiment of the reciprocating file that can be expanded provided by the present invention, the insertion rod 1 is provided with a receiving hole that passes through both ends; the push-pull rod 32 is rotatably arranged in the receiving hole, the front end of the push-pull rod 32 is threadedly connected with the wedge block 31, and the rear end of the push-pull rod 32 passes through the receiving hole and is provided with a knob 33 for axially limiting the push-pull rod 32.

[0057] Specifically, the receiving hole is coaxially arranged on the insertion rod 1, and the push-pull rod 32 is inserted into the receiving hole, so that the push-pull rod 32 can rotate, thereby pulling the wedge block 31 backward. The rear end of the push-pull rod 32 passes through the receiving hole and is provided with a knob 33, which can be used to abut against the rear end surface of the insertion rod 1 to limit the forward movement of the push-pull rod 32, and the knob 33 can also be used to rotate the push-pull rod 32.

[0058] Please also read Figures 2 to 4 As a specific embodiment of the expandable reciprocating file provided by the present invention, the bone file piece 2 includes a file plate 21 and an elastic connecting portion 22.

[0059] One side of the file plate 21 is a file surface 24, and the other side of the file plate is in sliding contact with the wedge surface of the wedge block 31. The elastic connecting portion 22 is connected between the file plate 21 and the front end of the insertion rod 1.

[0060] The file plate 21 is connected to the front end of the insertion rod 1 through the elastic connection part 22, so that when the wedge block 31 moves along the wedge angle to open the two file plates 21, the elastic connection part 22 will be deformed, and when the wedge block 31 moves in the opposite direction, the rebound force of the elastic connection part 22 will restore the file plate 21.

[0061] Specifically, the two bone rasp pieces 2 each include a rasp plate 21 and an elastic connection portion 22, the wedge block 31 is located between the two rasp plates 21, and the two wedge surfaces are respectively in sliding contact with the two rasp plates 21. The elastic connection portion 22 may be an elastic long metal strip.

[0062] Please also read Figure 2 and Figure 3 As a specific embodiment of the reciprocating file that can be spread apart provided by the present invention, the wedge angle of the wedge block 31 faces the insertion rod 1, and the front end of the insertion rod 1 is provided with a limit block 23 that limits the wedge block 31 to the extreme position of the insertion rod 1. This arrangement prevents the wedge block 31 from spreading the two bone file blades 2 too far apart.

[0063] Specifically, the two bone rasp pieces 2 each include a rasp plate 21 and an elastic connecting portion 22 , and the limiting block 23 is located between the elastic connecting portions 22 of the two bone rasp pieces 2 .

[0064] Please also read Figure 4 As a specific embodiment of the expandable reciprocating file provided by the present invention, the insertion rod 1 includes an outer sleeve 11 and an inner sleeve 12. The front end of the outer sleeve 11 is respectively connected to two bone file pieces 2. The inner sleeve 12 is inserted into the outer sleeve 11, and the inner cavity forms a receiving hole.

[0065] Specifically, the outer sleeve 11 and the inner sleeve 12 are coaxially sleeved together, so that the inner sleeve 12 or the outer sleeve 11 can be replaced separately. The push-pull rod 32 is rotatably arranged in the inner cavity of the inner sleeve 12. The limit block 23 is connected to the front end of the outer sleeve 11.

[0066] Please also read Figure 2 and Figure 3 As a specific embodiment of the expandable reciprocating file provided by the present invention, the outer periphery of the front end of the inner sleeve 12 is provided with a clamping plate 14 limited between the two bone file pieces 2, and the clamping plate 14 is used to limit the rotation of the inner sleeve 12 relative to the outer sleeve 11.

[0067] Specifically, the plate surface of the clamping plate 14 is perpendicular to the axis of the inner sleeve 12 , and the two bone rasp pieces 2 each include a rasp plate 21 and an elastic connecting portion 22 . The clamping plate 14 is inserted between the two elastic connecting portions 22 to limit the rotation of the inner sleeve 12 relative to the outer sleeve 11 .

[0068] Please also read Figure 2 and Figure 3 As a specific embodiment of the reciprocating file that can be expanded provided by the present invention, the clamping plate 14 is located between the limiting block 23 and the wedge block 31, and the limiting block 23 limits the wedge block 31 to the extreme position close to the insertion rod 1 through the clamping plate 14.

[0069] Please also read Figure 1 , Figure 3 and Figure 4 As a specific embodiment of the expandable reciprocating file provided by the present invention, the rear end of the insertion rod 1 is provided with a connector 15 for connecting to a reciprocating motion device.

[0070] The specific form of the connector 15 can be set according to the existing reciprocating motion equipment, and specifically can be cylindrical or quadrangular prism-shaped, so as to be clamped by the reciprocating motion equipment.

[0071] 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 reciprocating file that can be expanded, characterized in that: include: Insertion of rods; Two bone rasp blades, with rasp surfaces facing each other, are respectively connected to the front end of the insertion rod and are used to be inserted into the bone grafting cavity of the cone fusion cage with the rasp surfaces facing the vertebral end plate; and An expansion mechanism, provided on the insertion rod and located between the two bone rasp pieces, for expanding the two bone rasp pieces; The expansion mechanism comprises: A wedge block is disposed between the two bone rasp pieces and has two wedge surfaces that are in sliding contact with the two bone rasp pieces respectively; A push-pull assembly is provided on the insertion rod and is used to push and pull the wedge block to slide back and forth along the wedge angle. The push-pull assembly includes: A push-pull rod is rotatably arranged on the insertion rod, and one end of the push-pull rod is threadedly connected to the wedge block; the push-pull rod is threadedly connected to the wedge block, and the wedge block is driven to move by rotating the push-pull rod; The insertion rod is provided with a receiving hole that passes through both ends; the push-pull rod is rotatably inserted into the receiving hole, the front end of the push-pull rod is threadedly connected with the wedge block, and the rear end of the push-pull rod passes out of the receiving hole and is provided with a knob for axially limiting the push-pull rod; The bone rasp comprises: A file plate, one side of which is the file surface, and the other side of which is in sliding contact with the wedge surface of the wedge block; and An elastic connecting portion connected between the file plate and the front end of the insertion rod; The file plate is connected to the front end of the insertion rod through an elastic connection part, so that when the wedge moves along the wedge angle to spread the two file plates apart, the elastic connection part will be deformed, and when the wedge moves in the opposite direction, the resilience of the elastic connection part will reset the file plates; The wedge angle of the wedge block faces the insertion rod, and a limiting block is provided at the front end of the insertion rod to limit the wedge block to the extreme position close to the insertion rod, so as to prevent the wedge block from spreading the two bone rasp pieces too far apart.

2. The expandable reciprocating file according to claim 1, characterized in that: The insertion rod comprises: An outer sleeve, the front end of which is respectively connected to the two bone rasp pieces; and The inner sleeve is inserted into the outer sleeve, and the inner cavity forms the accommodating hole.

3. The expandable reciprocating file according to claim 2, characterized in that: A clamping plate is disposed on the outer periphery of the front end of the inner sleeve and is limited between the two bone rasp pieces. The clamping plate is used to limit the rotation of the inner sleeve relative to the outer sleeve.

4. The expandable reciprocating file according to claim 3, characterized in that: The clamping plate is located between the limiting block and the wedge block, and the limiting block limits the wedge block to a limit position close to the insertion rod through the clamping plate.

5. The expandable reciprocating file according to claim 4, characterized in that: The rear end of the insertion rod is provided with a connector for connecting with a reciprocating motion device.

Images