Anterior cervical minimally invasive fusion device
By designing universal screws with variable insertion directions and pressurized screws with intervertebral compression, the problem of fixation of screw insertion directions and insufficient intervertebral compression in traditional cervical anterior minimally invasive fusion devices is solved, and more microscopic Invasive surgery and higher intervertebral stability and bone graft fusion rate.
Patent Information
- Application Number
- CN202420545615.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-20
- Publication Date
- 2025-02-14
- Estimated Expiration
- 2034-03-20
AI Technical Summary
In traditional cervical anterior minimally invasive fusion devices, the screw insertion direction is fixed, and the surgical incision is often required, and the steel plate cannot achieve intervertebral compression, resulting in postoperative screw loosening, cage displacement, and infusion of intervertebral bone graft.
A minimally invasive cervical anterior fusion device including a plate body, an intervertebral fusion device, a universal screw and a pressurized screw is designed. The plate body is connected to the intervertebral fusion device, and a universal screw hole is provided to make the universal screw placement direction variable, and an arcuate slope is provided in the pressurization screw hole to achieve intervertebral compression.
Through the variable insertion direction of the universal screw, the size limit of the surgical incision is reduced and the scope of application is broadened. Through the intervertebral compression of the pressurized screw, the intervertebral stability and bone graft fusion rate are improved, and the cage movement is reduced bit occurrence.
Smart Images
Figure CN222467058U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of medical devices, and in particular to a minimally invasive anterior cervical fusion device. Background Art
[0002] Anterior cervical discectomy and fusion (ACDF) is one of the main surgical procedures for the treatment of cervical spondylosis. Traditional ACDF requires the placement of a steel plate in front of the intervertebral space and fixation to the upper and lower vertebrae after the intervertebral fusion device is placed. However, this type of steel plate plus intervertebral fusion device (cage) combination generally has a series of problems. First, this type of steel plate is generally designed with 4 locking screw holes, and the direction of screw placement is fixed. It is often necessary to expand the surgical incision to obtain the screw placement angle. Even when dealing with high intervertebral spaces, the direction of screw placement is often hindered by the obstruction of the mandible, which limits its use. In addition, this type of steel plate cannot achieve intervertebral compression. Due to the loose fit between the intervertebral fusion device and the upper and lower end plates, postoperative screw loosening, cage displacement, and intervertebral bone graft non-fusion often occur.
[0003] How to ensure that the direction of screw insertion is variable so that screw insertion is not limited by incision size and segment height, and how to achieve intervertebral pressure to make the cage and upper and lower end plates fit more closely, increase intervertebral stability, improve bone graft fusion rate and reduce the incidence of cage displacement are problems that technical personnel in this field need to solve. Utility Model Content
[0004] The purpose of the present application is to provide a minimally invasive anterior cervical fusion device to solve the problems that the current screw placement direction is fixed, the surgical incision often needs to be enlarged to obtain the screw placement angle, and even when dealing with high intervertebral spaces, the screw placement direction is often hindered due to the obstruction of the mandible, thus limiting its use; and the current steel plate cannot achieve intervertebral pressurization, there are problems such as the cage and the upper and lower end plates are not tightly fitted, the screws are loosened after surgery, the cage is displaced, and the intervertebral bone graft does not fuse.
[0005] In order to solve the above technical problems, the present application provides a minimally invasive anterior cervical fusion device, comprising: a plate, an intervertebral fusion cage, a universal screw and a compression screw;
[0006] The plate body is connected to the intervertebral fusion device, and locking pressure holes are respectively provided at both ends of the plate body, and the two locking pressure holes are respectively located on both sides of the intervertebral fusion device, the first end of the locking pressure hole close to the intervertebral fusion device is a universal screw hole matched with the universal screw, and the second end of the locking pressure hole away from the intervertebral fusion device is a pressure screw hole matched with the pressure screw, and an arc-shaped slope is provided on the inner side of the pressure screw hole, the arc-shaped slope faces the universal screw hole, and the arc-shaped slope extends along the hole depth direction of the pressure screw hole while extending from the second end to the first end.
[0007] Optionally, the plate body includes an intermediate plate body and a first plate body and a second plate body respectively integrally connected to the intermediate plate body, the first plate body, the intermediate plate body and the second plate body form a cross shape, the intermediate plate body is connected to the intervertebral fusion device, and the two locking and pressurizing holes are respectively arranged on the first plate body and the second plate body.
[0008] Optionally, both the first plate body and the second plate body are arc-shaped plates, and the curvature of the arc-shaped plates is adapted to the physiological curvature of the cervical lordosis.
[0009] Optionally, the plate body and the intervertebral fusion cage are detachably connected.
[0010] Optionally, the widths of the first plate body and the second plate body decrease from an end away from the middle plate body to an end close to the middle plate body.
[0011] Optionally, end edges of the first plate body, the second plate body and the middle plate body are arc-shaped.
[0012] Optionally, a surface of the intervertebral fusion cage close to the lower end plate is convex.
[0013] Optionally, the intervertebral fusion device has serrations on one side close to the upper end plate and one side close to the lower end plate.
[0014] Optionally, an elliptical hollow is provided in the middle of the intervertebral fusion cage for bone grafting.
[0015] Optionally, the intermediate plate body is provided with a protrusion, the intervertebral fusion cage is provided with a groove, and the intermediate plate body and the intervertebral fusion cage are clamped together via the protrusion and the groove.
[0016] The present application provides a minimally invasive anterior cervical fusion device, comprising: a plate body, an intervertebral fusion device, a universal screw and a pressure screw; the plate body is connected to the intervertebral fusion device, and locking pressure holes are respectively provided at both ends of the plate body, and the two locking pressure holes are respectively located on both sides of the intervertebral fusion device, the first end of the locking pressure hole close to the intervertebral fusion device is a universal screw hole matched with the universal screw, and the second end of the locking pressure hole away from the intervertebral fusion device is a pressure screw hole matched with the pressure screw, and an arc-shaped slope is provided on the inner side of the pressure screw hole, the arc-shaped slope faces the universal screw hole, and the arc-shaped slope extends along the hole depth direction of the pressure screw hole and extends along the second end to the first end. By setting a universal screw hole, the insertion direction of the universal screw that matches it can be changed, so that the insertion of the universal screw is not limited by the incision size and the height of the segment, which can make the surgical incision more minimally invasive and broaden the applicable segment range of ACDF; the plate body and the intervertebral fusion device are connected to reduce the incidence of intervertebral fusion device displacement and eliminate complications of nerve damage caused by the intervertebral fusion device protruding into the spinal canal; the combination of the pressure screw hole and the pressure screw applies pressure in the direction of the upper and lower vertebrae approaching each other, so that the intervertebral fusion device and the upper and lower end plates fit more closely, increase intervertebral stability, and improve bone graft fusion rate. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] In order to more clearly illustrate the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.
[0018] Figure 1 A sagittal schematic diagram of a minimally invasive anterior cervical fusion device provided in an embodiment of the present application installed in the body;
[0019] Figure 2 A coronal schematic diagram of a minimally invasive anterior cervical fusion device provided in an embodiment of the present application installed in a body;
[0020] Figure 3 A cross-sectional view of a pressurized screw hole provided in the present embodiment;
[0021] The reference numerals are as follows: 1 is a plate body, 2 is an intervertebral fusion cage, 3 is a universal screw, 4 is an upper vertebral body, 5 is a lower vertebral body, 6 is a locking pressure hole, 101 is an intermediate plate body, 102 is a first plate body, 103 is a second plate body, 201 is an elliptical hollow, 401 is a lower end plate, 501 is an upper end plate, 601 is a universal screw hole, 602 is a pressure screw hole, and 6021 is an arc slope. DETAILED DESCRIPTION
[0022] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.
[0023] The core of this application is to provide a minimally invasive anterior cervical fusion device, which is used to ensure that the direction of screw insertion is variable, so that the screw insertion is not limited by the incision size and segment height, and to achieve intervertebral pressurization, so that the cage and the upper and lower end plates fit more closely, increase intervertebral stability, improve bone graft fusion rate and reduce the incidence of cage displacement.
[0024] In order to enable those skilled in the art to better understand the present application, the present application is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.
[0025] Figure 1 A sagittal schematic diagram of a minimally invasive anterior cervical fusion device provided in an embodiment of the present application installed in the body; Figure 2 A coronal schematic diagram of a minimally invasive anterior cervical fusion device provided in an embodiment of the present application installed in the body. Figure 1 and Figure 2 As shown, a minimally invasive anterior cervical fusion device comprises: a plate body 1, an intervertebral fusion cage 2, a universal screw 3 and a pressure screw; the plate body 1 is connected to the intervertebral fusion cage 2, and locking pressure holes 6 are respectively provided at both ends of the plate body 1, and the two locking pressure holes 6 are respectively located on both sides of the intervertebral fusion cage 2, the first end of the locking pressure hole 6 close to the intervertebral fusion cage 2 is a universal screw hole 601 matched with the universal screw 3, and the second end of the locking pressure hole 6 away from the intervertebral fusion cage 2 is a pressure screw hole 602 matched with the pressure screw, and the inner side of the pressure screw hole 602 is provided with an arc slope 6021, the arc slope 6201 faces the universal screw hole 601, and the arc slope 6021 extends along the hole depth direction of the pressure screw hole 6201 and extends from the second end to the first end.
[0026] The embodiment of the present application does not specifically limit the shape and material of the plate body 1. The plate body 1 is usually made of steel plate. In the embodiment of the present application, the plate body 1 and the intervertebral fusion device 2 can be connected in an integrated manner or in a detachable manner. The detachable manner is convenient for matching different sizes of the plate body 1 and the intervertebral fusion device 2 according to the vertebral height and the intervertebral space height. A locking pressure hole 6 is provided at each end of the plate body 1. Figure 2As shown, the locking and pressurizing hole 6 is elliptical. The first end of the locking and pressurizing hole 6 close to the intervertebral fusion cage 2 is a universal screw hole 601, which cooperates with the universal screw 3 to ensure that the direction of insertion of the universal screw 3 is variable. The second end of the locking and pressurizing hole 6 away from the intervertebral fusion cage 2 is a pressurizing screw hole 602 that cooperates with the pressurizing screw. Figure 3 A cross-sectional view of a pressurized screw hole provided in the present embodiment, such as Figure 3 As shown, an arc-shaped slope 6021 is provided on the inner side of the pressure screw hole 602, and the arc-shaped slope 6021 faces the universal screw hole 601, and the arc-shaped slope 6021 extends along the hole depth direction of the pressure screw hole 602 while extending along the second end of the locking pressure hole 6 to the first end of the locking pressure hole 6. The purpose of such a setting is that the pressure screw hole 602 can be used in conjunction with the pressure screw to apply pressure in the direction in which the upper vertebral body 4 and the lower vertebral body 5 are close to each other, so that the intervertebral fusion device 2 fits more closely with the upper end plate 501 and the lower end plate 401, thereby increasing intervertebral stability and improving bone graft fusion rate. The locking pressure hole 6 includes the universal screw hole 601 and the pressure screw hole 602. One locking pressure hole 6 can be used in conjunction with the universal screw 3 and the pressure screw at the same time, or it can be used in conjunction with the universal screw 3 or the pressure screw alone. For the elderly, who have osteoporosis problems, usually one locking pressure hole 6 is used in conjunction with the universal screw 3 and the pressure screw at the same time to achieve locking and pressure.
[0027] In addition, the diameter of the compression screw and the diameter of the universal screw 3 in the embodiment of the present application are 3.5 mm. The diameter of the screw used is thicker than that of the traditional anterior cervical plate screw, and the holding force is large. Only two screws are needed to provide sufficient fixation firmness, saving operation time.
[0028] A minimally invasive anterior cervical fusion device provided in an embodiment of the present application includes: a plate body, an intervertebral fusion device, a universal screw and a pressure screw; the plate body is connected to the intervertebral fusion device, and locking pressure holes are respectively provided at both ends of the plate body, and the two locking pressure holes are respectively located on both sides of the intervertebral fusion device, the first end of the locking pressure hole close to the intervertebral fusion device is a universal screw hole matched with the universal screw, and the second end of the locking pressure hole away from the intervertebral fusion device is a pressure screw hole matched with the pressure screw, and an arc-shaped slope is provided on the inner side of the pressure screw hole, the arc-shaped slope faces the universal screw hole, and the arc-shaped slope extends along the hole depth direction of the pressure screw hole and extends along the second end to the first end. By setting a universal screw hole, the insertion direction of the universal screw that matches it can be changed, so that the insertion of the universal screw is not limited by the incision size and the height of the segment, which can make the surgical incision more minimally invasive and broaden the applicable segment range of ACDF; the plate body and the intervertebral fusion device are connected to reduce the incidence of intervertebral fusion device displacement and eliminate complications of nerve damage caused by the intervertebral fusion device protruding into the spinal canal; the combination of the pressure screw hole and the pressure screw applies pressure in the direction of the upper and lower vertebrae approaching each other, so that the intervertebral fusion device and the upper and lower end plates fit more closely, increase intervertebral stability, and improve bone graft fusion rate.
[0029] Based on the above embodiments, Figure 2 As shown, the plate body 1 of the embodiment of the present application includes an intermediate plate body 101 and a first plate body 102 and a second plate body 103 respectively connected to the intermediate plate body 101 in an integral manner. The first plate body 102, the intermediate plate body 101 and the second plate body 103 form a cross shape. The intermediate plate body 101 is connected to the intervertebral fusion device 2, and two locking and pressurizing holes 6 are respectively provided on the first plate body 102 and the second plate body 103.
[0030] The plate body 1 of the embodiment of the present application is cross-shaped, which can ensure that there is a certain connection surface between the middle plate body 101 and the intervertebral fusion cage 2. A locking and pressurizing hole 6 is set on each of the first plate body 102 and the second plate body 103. The size of the first plate body 102 and the second plate body 103 can be slightly larger than the locking and pressurizing hole 6. One locking and pressurizing hole 6 can make the area of the first plate body 102 and the second plate body 103 smaller, which can save the exposed space required for placing the plate body 1.
[0031] The middle plate body 101 is provided with a protrusion, and the intervertebral fusion cage 2 is provided with a groove. The middle plate body 101 and the intervertebral fusion cage 2 are clamped together through the protrusion and the groove, so that the plate body 1 and the intervertebral fusion cage 2 can be tightly combined.
[0032] Furthermore, the first plate body 102 and the second plate body 103 are both arc-shaped plates, and the curvature of the arc-shaped plates matches the physiological curvature of the cervical lordosis to ensure that the plate body 1 fits the front edge of the vertebral body.
[0033] To further reduce the area of the first plate 102 and the second plate 103, the width of the first plate 102 and the second plate 103 decreases from the end away from the middle plate 101 to the end close to the middle plate 101. The maximum width of the first plate 102 and the second plate 103 can be 5-6 mm, and the length is 6-7 mm.
[0034] Furthermore, the end edges of the first plate body 102, the second plate body 103 and the middle plate body 101 are arc-shaped. Compared with the end edges with corners, the arc-shaped end edges can reduce the harm to the human body.
[0035] Based on the above embodiments, the intervertebral fusion cage 2 of the present application embodiment has a convex surface close to the lower end plate 401. The convex surface is adapted to the physiological curvature of the lower end plate 401, and its purpose is to ensure that the intervertebral fusion cage 2 fits the upper and lower end plates, reduce the incidence of displacement of the intervertebral fusion cage 2, and prevent the intervertebral fusion cage 2 from protruding into the spinal canal and causing serious complications of nerve damage.
[0036] In addition, the side of the intervertebral fusion cage 2 close to the upper end plate 501 and the side close to the lower end plate 401 are provided with serrations to increase the friction between the intervertebral fusion cage 2 and the end plates. The middle part of the intervertebral fusion cage 2 is provided with an elliptical hollow 201 suitable for bone grafting.
[0037] To better understand the present application, the use process of the anterior cervical minimally invasive fusion device is introduced below.
[0038] Through the front incision of the neck, the skin, subcutaneous tissue, and platysma muscle are cut in turn, and the carotid sheath and cervical visceral sheath are pulled apart to both sides to expose the front of the cervical vertebral body and the front of the intervertebral disc. After the surgical segment is determined by fluoroscopic positioning, the intervertebral space is decompressed. After sufficient decompression, the size of the intervertebral fusion device 2 and the plate body 1 is determined by trial modeling. The intervertebral fusion device 2 and the plate body 1 of appropriate size are selected and assembled into one. Bone is implanted in the intervertebral fusion device 2. The plate body 1 is slowly knocked with a hammer and a push rod to make the device go deeper until the plate body 1 and the front edge of the vertebral body are fully fitted. The lifting device feels the tightness of the intervertebral fusion device 2 and the upper and lower end plates. If the tightness is sufficient, the universal screw 3 can be directly inserted into the universal screw hole 601. If the tightness is not enough, the pressure screw can be inserted into the pressure screw hole 602. The plate body 1, intervertebral fusion device 2, and the screw position are observed by C-arm fluoroscopy. After meeting the requirements, the incision is flushed and the incision is closed after sufficient hemostasis.
[0039] The present application provides a minimally invasive anterior cervical fusion device with the following advantages: (1) The plate and the intervertebral fusion device are designed to be connected by protrusions and grooves. This design enables the device to replace intervertebral fusion devices and plates of different sizes according to the height of the vertebral body and the height of the intervertebral space; and the plate and the intervertebral fusion device are tightly combined to reduce the incidence of intervertebral fusion device displacement and prevent the serious complication of nerve damage caused by the intervertebral fusion device protruding into the spinal canal. (2) The plate of the present device is designed according to the physiological curvature of the anterior lordosis of the cervical spine to ensure that the plate fits the anterior edge of the vertebral body. In addition, the intervertebral fusion device is also designed with a convex surface to make it fit firmly with the lower end plate of the upper vertebral body. (3) The first plate and the second plate of the device are designed to be only slightly larger than the locking pressure hole, saving the exposed space required for placing the plate, and the first plate and the second plate are each designed with an elliptical locking pressure hole, which can be flexibly selected according to the intraoperative situation. When the surgeon determines that the cage and the upper and lower end plates are tightly combined, the universal screw can be directly inserted; when the surgeon determines that the intervertebral fusion device and the upper and lower end plates are not tightly combined and longitudinal pressure is required (pressure in the direction where the upper and lower vertebrae are close to each other), the pressure screw can be inserted, and the longitudinal pressure is transmitted to the intervertebral fusion device through the plate body, so as to achieve longitudinal pressure of the intervertebral space, make the intervertebral fusion device and the upper and lower end plates fit more closely, increase intervertebral stability, and improve bone graft fusion rate. (4) The diameter of the screws used in this device is thicker than that of the traditional anterior cervical plate screws, and the holding force is greater. Only two screws are needed to provide sufficient fixation firmness, saving surgical time. (5) The universal screw hole design of this device ensures that the universal screw insertion direction is variable, so that the universal screw insertion is not limited by the incision size and segment height, which can make the surgical incision more minimally invasive and broaden the applicable segment range of ACDF.
[0040] The above is a detailed introduction to a minimally invasive anterior cervical fusion device provided by the present application. The various embodiments in the specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same and similar parts between the various embodiments can be referenced to each other. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall within the scope of protection of the claims of the present application.
[0041] It should also be noted that, in this specification, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprise", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the statement "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device including the element.
Claims
1. A minimally invasive anterior cervical fusion device, characterized in that: include: A plate (1), an intervertebral fusion cage (2), a universal screw (3) and a compression screw; The plate body (1) is connected to the intervertebral fusion device (2), and locking pressurizing holes (6) are respectively provided at both ends of the plate body (1), and the two locking pressurizing holes (6) are respectively located on both sides of the intervertebral fusion device (2), and the first end of the locking pressurizing hole (6) close to the intervertebral fusion device (2) is a universal screw hole (601) matched with the universal screw (3), and the second end of the locking pressurizing hole (6) away from the intervertebral fusion device (2) is a pressurizing screw hole (602) matched with the pressurizing screw, and the inner side of the pressurizing screw hole (602) is provided with an arc slope (6021), and the arc slope (6021) faces the universal screw hole (601), and the arc slope (6021) extends along the hole depth direction of the pressurizing screw hole (602) and extends from the second end to the first end.
2. The minimally invasive anterior cervical fusion device according to claim 1, characterized in that: The plate body (1) comprises an intermediate plate body (101) and a first plate body (102) and a second plate body (103) respectively connected to the intermediate plate body (101) in an integral manner, wherein the first plate body (102), the intermediate plate body (101) and the second plate body (103) form a cross shape, the intermediate plate body (101) is connected to the intervertebral fusion device (2), and the two locking and pressurizing holes (6) are respectively arranged on the first plate body (102) and the second plate body (103).
3. The minimally invasive anterior cervical fusion device according to claim 2, characterized in that: The first plate body (102) and the second plate body (103) are both arc-shaped plates, and the curvature of the arc-shaped plates is adapted to the physiological curvature of the cervical lordosis.
4. The minimally invasive anterior cervical fusion device according to claim 1, characterized in that: The plate body (1) and the intervertebral fusion cage (2) are detachably connected.
5. The minimally invasive anterior cervical fusion device according to claim 2, characterized in that: The width of the first plate body (102) and the second plate body (103) decreases from an end away from the middle plate body (101) to an end close to the middle plate body (101).
6. The minimally invasive anterior cervical fusion device according to claim 5, characterized in that: The end edges of the first plate body (102), the second plate body (103) and the middle plate body (101) are arc-shaped.
7. The minimally invasive anterior cervical fusion device according to claim 1, characterized in that: The surface of the intervertebral fusion cage (2) close to the lower end plate (401) is a convex surface.
8. The minimally invasive anterior cervical fusion device according to claim 7, characterized in that: The intervertebral fusion cage (2) is provided with saw teeth on one side close to the upper end plate (501) and on one side close to the lower end plate (401).
9. The minimally invasive anterior cervical fusion device according to any one of claims 1 to 8, characterized in that: The middle part of the intervertebral fusion cage (2) is provided with an elliptical hollow (201) for bone grafting.
10. The minimally invasive anterior cervical fusion device according to claim 2, characterized in that: The intermediate plate body (101) is provided with a protrusion, and the intervertebral fusion cage (2) is provided with a groove. The intermediate plate body (101) and the intervertebral fusion cage (2) are clamped together via the protrusion and the groove.