Self-locking nail plate system for anterior cervical vertebrae advancement surgery

Abstract

The utility model discloses a self-locking screw plate system for an anterior cervical vertebral body advancement operation, which comprises a fixing plate, an advancement screw and a distraction screw, the fixing plate is connected with a vertebral body, and the fixing plate is provided with a screw fixing groove extending along the long end direction of the fixing plate; a locking groove is formed in the head of the forward screw, the locking groove is communicated with an internal thread, an instrument groove for an instrument to be inserted is further formed in the head of the forward screw, and the instrument groove is communicated with the outer end face of the head of the forward screw and the locking groove, so that when the forward screw penetrates through the screw fixing groove, the locking groove is communicated with the locking groove. The head of the screw is extruded and deformed to be clamped in the screw fixing groove; the opening screw is arranged in the locking groove in a threaded penetrating mode, and the head of the opening screw expands the head of the forward moving screw in an expanding mode. The ACAF screw can solve the problem that an existing ACAF operation fails due to the fact that the screw is loosened and disengaged.

Description

Technical Field

[0001] The utility model belongs to the technical field of medical devices, and in particular relates to a self-locking nail plate system for anterior cervical vertebral advancement surgery. Background Art

[0002] Ossification of the posterior longitudinal ligament (OPLL) is a common degenerative spinal disease. The OPLL is a ligament located between the posterior vertebral body and the spinal canal. When it ossifies, it can lead to spinal canal stenosis and intervertebral foraminal stenosis, potentially causing clinical symptoms such as limb movement disorders, numbness, and urinary and bowel problems. OPLL is most commonly found in the cervical spine, where it forms as ossification of the posterior longitudinal ligament (OPLL). OPLL has a higher incidence in East Asian populations.

[0003] With the continuous innovation of clinical surgical technology, anterior cervical vertebral ossification complex advancement and fusion (ACAF) is a new surgical method that uses anterior surgery to solve the problem of ossification of the posterior longitudinal ligament. It avoids the problems of large damage and unclear surgical efficacy of posterior surgery, and perfectly solves the problems of complications of traditional anterior cervical surgery, completely decompresses, reconstructs physiological curvature, and avoids complications.

[0004] However, ACAF surgery is prone to problems such as screw loosening and dislocation, leading to surgical failure. Utility Model Content

[0005] The utility model aims to provide a self-locking screw plate system for anterior cervical vertebral advancement surgery, so as to solve the technical problems of screw loosening and dislocation in ACAF surgery in the prior art, which lead to surgical failure.

[0006] The technical solutions adopted to solve the above technical problems are:

[0007] The utility model discloses a self-locking nail plate system for anterior cervical vertebral advancement surgery, comprising:

[0008] A fixation plate, the fixation plate being connected to the vertebral body and provided with a screw fixing slot extending along the long end thereof;

[0009] An advancement screw, wherein the head of the advancement screw is provided with a locking groove, the locking groove is connected to an internal thread, and the head of the advancement screw is further provided with an instrument groove for inserting an instrument, the instrument groove communicating with the outer end surface of the advancement screw head and the locking groove, so that when the advancement screw passes through the screw fixing groove, the head of the advancement screw is squeezed and deformed and snapped into the screw fixing groove;

[0010] A spreading screw is threadedly inserted into the locking groove, and the head of the spreading screw enlarges the head of the advancement screw.

[0011] At least one beneficial effect of the present invention is that when a self-locking screw plate system is used in an ACAF procedure for anterior cervical vertebral advancement surgery, medical personnel secure the fixation plate to the vertebral body. The screw fixing slot extends along the long end of the fixation plate, allowing the advancement screw inserted into the screw fixing slot to slide along the extension direction of the screw fixing slot to adjust the connection position of the advancement screw and the vertebral body to be advanced.

[0012] The advancement screw is equipped with an instrument slot, which facilitates the connection of the advancement screw to the vertebra to be advanced using an instrument. The instrument slot connects the outer end surface of the advancement screw head and the locking slot, allowing the advancement screw head to deform under force. Thus, the advancement screw head can be squeezed and deformed to engage the screw fixing slot.

[0013] The head of the advancement screw is provided with a locking groove connected to the internal thread, and the expansion screw is threadedly connected to the internal thread through the connected locking groove. During the screwing process, the head of the expansion screw is continuously inserted and abuts the locking groove, thereby expanding the head of the advancement screw, so that the outer end face of the head of the advancement screw abuts and is fixed to the wall surface of the screw fixing groove, thereby achieving a stable connection between the advancement screw and the fixing plate, thereby avoiding the problem of loosening and dislodging of the advancement screw during ACAF surgery, which leads to surgical failure.

[0014] As a further improvement of the above technical solution, the screw fixing groove includes a first clamping groove, an anti-retreat groove and a second clamping groove arranged in sequence, the groove width of the anti-retreat groove is larger than the groove width of the first clamping groove and the groove width of the second clamping groove, and the head of the forward screw is provided with a clamping ring, which is clamped in the anti-retreat groove.

[0015] Through the above arrangement, a snap ring is provided on the head of the advancement screw. Since the width of the anti-retreat groove is greater than the width of the first clamping groove and the width of the second clamping groove, the snap ring is squeezed and deformed by the groove wall of the first clamping groove and then clamped in the anti-retreat groove. At this time, both the first clamping groove and the second clamping groove limit the movement of the snap ring so that the advancement screw is firmly clamped in the screw fixing groove, so that the head of the advancement screw can only rotate or slide along the extension direction of the screw fixing groove.

[0016] As a further improvement of the above technical solution, the width of the first card slot is greater than the width of the second card slot.

[0017] Through the above arrangement, the head of the advancement screw is more easily squeezed and deformed inward by the groove wall surface of the first clamping groove and penetrates into the anti-retraction groove, but the same force does not easily cause the advancement screw to pass through the second clamping groove and fall out of the screw fixing groove, thereby avoiding excessive force when inserting the advancement screw, causing the head of the advancement screw to pass through the second clamping groove directly after penetrating the anti-retraction groove.

[0018] As a further improvement of the above technical solution, the head of the distraction screw is provided with an instrument opening for cooperating with an instrument.

[0019] With the above arrangement, an instrument is inserted into the instrument port, so that the distraction screw can be simply and quickly threaded into the advancement screw to expand the head of the advancement screw.

[0020] As a further improvement of the above technical solution, the shape of the outer end surface of the head of the advancement screw corresponds to the shape of the groove wall surface of the locking groove.

[0021] Through the above arrangement, the outer end face and the inner end face of the advancement screw head have the same shape, so that the thickness of the advancement screw head is uniform. When the expansion screw is screwed into the locking groove, the advancement screw can be evenly expanded, so that the advancement screw is evenly squeezed and deformed.

[0022] As a further improvement of the above technical solution, the outer end surface of the head of the advancement screw is a cylindrical surface, the groove cross-section of the second clamping groove is square, and the end surface of the head of the expansion screw is a conical surface.

[0023] This arrangement creates a cylindrical outer end surface on the advancement screw's head, and correspondingly, a cylindrical wall surface on the locking slot, making the advancement screw's head more easily deformable. The second slot's square cross-section ensures that, after the advancement screw is inserted into the fixing plate, the outer end surface of its head and the wall surface of the second slot are in stable contact, preventing the advancement screw from shifting. The conical end surface of the expansion screw's head further expands the advancement screw.

[0024] As a further improvement of the above technical solution, a plurality of screw fixing grooves are provided and extend along the long end of the fixing plate, and at least one advancement screw is passed through each of the screw fixing grooves.

[0025] Through the above arrangement, screw fixation slots can be set according to the different surgical scopes of the patient. Each screw fixation slot corresponds to a vertebra that the patient needs to advance. When the patient needs to advance a large number of vertebrae, the number of screw fixation slots on the fixation plate can be increased accordingly. The vertebra that needs to be advanced can be pulled toward the fixation plate by one or more advancement screws.

[0026] As a further improvement of the above technical solution, fixing screw holes are provided at opposite ends of the fixing plate, and bone screws are passed through the fixing screw holes.

[0027] With the above arrangement, the bone screws are connected to the vertebral body after passing through the fixing screw holes, thereby achieving connection and fixation between the fixation plate and the vertebral body. Fixation screw holes are provided at opposite ends of the fixation plate, thereby firmly connecting the fixation plate and the vertebral body.

[0028] As a further improvement of the above technical solution, the fixing plate is threadedly connected with a locking plate, and the locking plate is provided with an arc notch corresponding to the fixing screw hole. The bone screw passes through the arc notch and the fixing screw hole, and the locking plate is tightened so that the arc notch and the fixing screw hole are staggered.

[0029] Through the above arrangement, after the bone screw passes through the arc notch and the fixing screw hole and is connected to the vertebral body, the locking plate is tightened. At this time, the arc notch and the fixing screw hole are staggered with each other, and the locking plate corresponds to the fixing screw hole, thereby locking the bone screw on the fixing plate to prevent the bone screw from detaching from the fixing plate.

[0030] As a further improvement of the above technical solution, the fixing plate is provided with a positioning hole for temporary positioning.

[0031] Through the above setting, instruments are used to pass through the positioning holes and the vertebral body to temporarily position the fixation plate on the vertebral body, making it easier to pass the bone screws through the fixing screw holes and connect them to the vertebral body. Medical staff do not need to hold the fixation plate, making the connection between the fixation plate and the vertebral body easier. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0033] Figure 1 This is a schematic diagram of the connection between the self-locking nail plate system and the vertebral body for anterior cervical vertebral advancement surgery provided by an embodiment of the utility model;

[0034] Figure 2 This is a schematic structural diagram of a self-locking nail plate system for anterior cervical vertebral advancement surgery provided by an embodiment of the present invention;

[0035] Figure 3 This is a cross-sectional view of a self-locking nail plate system for anterior cervical vertebral advancement surgery provided by an embodiment of the present invention;

[0036] Figure 4 This is a schematic structural diagram of a fixing plate provided in an embodiment of the present utility model;

[0037] Figure 5 is a cross-sectional view of a fixing plate provided in an embodiment of the present utility model;

[0038] Figure 6 This is a schematic structural diagram of the advancement screw provided by an embodiment of the present utility model;

[0039] Figure 7 is a cross-sectional view of an advancement screw provided by an embodiment of the present utility model;

[0040] Figure 8 It is a structural schematic diagram of the expansion screw provided by an embodiment of the utility model.

[0041] The following are marked in the accompanying drawings:

[0042] 100, fixing plate; 110, screw fixing slot; 111, first slot; 112, anti-retraction slot; 113, second slot; 120, fixing screw hole; 130, positioning hole; 140, locking hole;

[0043] 200, advancement screw; 210, first head; 211, locking groove; 220, first rod; 221, internal thread; 222, advancement thread; 230, instrument slot; 231, deformation portion; 240, snap ring;

[0044] 300, distraction screw; 310, second head; 311, instrument port; 320, second rod; 321, external thread;

[0045] 400, bone screw;

[0046] 500, locking piece; 510, cross slot; 520, arc notch;

[0047] 600. Vertebrae. DETAILED DESCRIPTION

[0048] This section will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and overall technical solution of the present invention, but it cannot be understood as a limitation on the scope of protection of the present invention.

[0049] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0050] In the description of this utility model, if the word "several" or "several" is used, it means one or more, and "more" means two or more. "greater than," "less than," and "exceed" are understood to exclude the number itself, while "above," "below," and "within" are understood to include the number itself. The use of the words "first," "second," and "third" is only for the purpose of distinguishing technical features and is not to be construed as indicating or implying relative importance, or implicitly indicating the number of the indicated technical features, or implicitly indicating the order of the indicated technical features.

[0051] It should be noted that the X direction in the accompanying drawings is from the back side of the self-locking nail plate system for anterior cervical vertebrae advancement surgery to the front side; the Y direction is from the left side of the self-locking nail plate system for anterior cervical vertebrae advancement surgery to the right side; and the Z direction is from the bottom side of the self-locking nail plate system for anterior cervical vertebrae advancement surgery to the top side.

[0052] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0053] Reference Figures 1 to 8 Several embodiments of the self-locking nail plate system for anterior cervical vertebral advancement surgery of the present invention are given below.

[0054] like Figures 1 to 8 As shown, the self-locking screw and plate system for anterior cervical vertebral advancement surgery according to an embodiment of the present invention includes a fixation plate 100 , an advancement screw 200 and a distraction screw 300 .

[0055] It is understood that the fixing plate 100 is connected to the vertebral body 600 so that the fixing plate 100 and the vertebral body 600 are relatively fixed. The fixing plate 100 is provided with a screw fixing slot 110, such as Figure 2 、 Figure 4 and Figure 5 As shown, the advancement screw 200 is connected to the vertebral body 600 after passing through the screw fixing slot 110. The screw fixing slot 110 extends along the long end of the fixation plate 100. The advancement screw 200 can slide along the extension direction of the screw fixing slot 110. Before passing through the vertebral body 600, the relative position of the advancement screw 200 and the fixation plate 100 is adjusted, thereby adjusting the connection position of the advancement screw 200 and the vertebral body 600.

[0056] It is understood that the advancement screw 200 includes a first head 210 and a first rod 220 connected to each other. The first head 210 is provided with a locking groove 211, and the first rod 220 is provided with an internal thread 221. The locking groove 211 and the internal thread 221 are connected to each other. The first rod 220 is also provided with an advancement thread 222 that cooperates with the bone of the vertebral body 600. Figure 7 shown.

[0057] It is understood that the first head 210 is provided with an instrument slot 230, such as Figure 6 and Figure 7 As shown, the instrument slot 230 is used to cooperate with an instrument, making it convenient for medical personnel to use the instrument to insert the instrument into the instrument slot 230 of the advancement screw 200, thereby driving the first rod portion 220 with the advancement thread 222 into the vertebral body 600, completing the connection between the advancement screw 200 and the vertebral body 600, and facilitating the forward pulling of the vertebral body 600.

[0058] It can be understood that the instrument groove 230 extends radially, one end of which is connected to the outer end surface of the first head 210, and the other end is connected to the locking groove 211, that is, the outer end surface and the inner end surface of the first head 210 are connected to each other, and the first head 210 will deform when subjected to force.

[0059] With this arrangement, when the forward screw 200 passes through the screw fixing groove 110 , the outer end surface of the first head 210 contacts the groove wall surface of the screw fixing groove 110 , causing the first head 210 to be squeezed inward and deformed, thereby causing the first head 210 to be clamped in the screw fixing groove 110 .

[0060] It can be understood that the expansion screw 300 includes a second head 310 and a second rod 320. The expansion screw 300 is inserted into the locking groove 211. The second rod 320 is provided with an external thread 321 corresponding to the internal thread 221. The second rod 320 is connected to the internal thread 221 of the first rod 220 through the external thread 321. Figure 8 shown.

[0061] With such arrangement, when the second rod portion 320 is screwed into the internal thread 221 of the first rod portion 220, the outer end surface of the second head portion 310 gradually contacts the groove wall surface of the locking groove 211, and the second head portion 310 of the expanded screw 300 expands the first head portion 210 from the inside to the outside, causing the first head portion 210 to deform, so that the outer end surface of the first head portion 210 gradually contacts the groove wall surface of the screw fixing groove 110, locking and fixing the advancement screw 200 in the screw fixing groove 110, realizing a close connection and relative fixation between the advancement screw 200 and the fixing plate 100, preventing the advancement screw 200 from loosening and falling off the fixing plate 100, resulting in failure of the operation.

[0062] In this embodiment, the long end of the fixing plate 100 extends in the vertical direction, and the fixing plate 100 can connect multiple vertebrae 600 in the vertical direction. Figure 1 After the advancement screw 200 is inserted into the screw fixing slot 110 , the screw insertion position of the advancement screw 200 can be adjusted along the screw fixing slot 110 extending vertically.

[0063] It can be understood that the screw fixing groove 110 extends in the front-to-back direction and connects the front and rear surfaces of the fixing plate 100. The advancement screw 200 penetrates in the front-to-back direction and is engaged in the screw fixing groove 110. Specifically, the screw fixing groove 110 includes a first clamping groove 111, an anti-retraction groove 112, and a second clamping groove 113 sequentially laid in the front-to-back direction. Figure 5 The width of the anti-recoil groove 112 is greater than that of the first slot 111 , and the width of the anti-recoil groove 112 is greater than that of the second slot 113 , that is, the left and right widths of the anti-recoil groove 112 are both greater than those of the first slot 111 and the second slot 113 .

[0064] Correspondingly, the first head 210 of the advancement screw 200 is provided with a snap ring 240, such as Figure 6 and Figure 7 As shown, the snap ring 240 is located at an end of the first head portion 210 away from the first rod portion 220 and is protruded from the outer end surface of the first head portion 210 .

[0065] In this way, when the forward screw 200 is inserted into the screw fixing groove 110, the first rod portion 220 directly passes through the first clamping groove 111, the anti-retreat groove 112 and the second clamping groove 113, and the first head portion 210 passes through the first clamping groove 111. When the clamping ring 240 passes through the first clamping groove 111, it is squeezed by the groove wall surface of the first clamping groove 111 and bent inward, so that the clamping ring 240 passes through the first clamping groove 111. When the clamping ring 240 passes through the anti-retreat groove 112, the clamping ring 240 returns to its original shape and is clamped in the anti-retreat groove 112. The first clamping groove 111 and the second clamping groove 113 with smaller widths clamp the clamping ring 240 from the front and back directions respectively, so that the first head portion 210 cannot move forward and backward, thereby realizing the clamping connection between the first head portion 210 and the screw fixing groove 110. The first head portion 210 can only rotate in the screw fixing groove 110 or move up and down along the screw fixing groove 110.

[0066] In some embodiments, the snap ring 240 is disposed along the middle portion of the first head portion 210. When the first head portion 210 is engaged with the screw fixing groove 110, the snap ring 240 is engaged with the anti-retraction groove 112, and the front and rear ends of the first head portion 210 are located in the first and second grooves 111 and 113, respectively.

[0067] In this embodiment, the snap ring 240 is disposed along the edge of the first head portion 210 away from the first rod portion 220, that is, the snap ring 240 is disposed at the front end of the first head portion 210. Figure 6 and Figure 7 When the first head 210 is engaged with the screw fixing groove 110 , the snap ring 240 is engaged with the anti-retraction groove 112 , and the rear end of the first head 210 is located in the second engaging groove 113 .

[0068] In some embodiments, the left and right widths of the first slot 111 and the left and right widths of the second slot 113 are equal, which facilitates the manufacture of the fixing plate 100 .

[0069] In this embodiment, the left and right widths of the first slot 111 are greater than the left and right widths of the second slot 113, making it easier for the first head 210 to deform under force and causing the retaining ring 240 to be engaged in the anti-retreat groove 112. The first head 210 is not easily deformed and is separated from the anti-retreat groove 112 through the second slot 113, thereby preventing the deformed first head 210 from being separated from the second slot 113 due to excessive force.

[0070] It is understandable that the second head 310 is provided with an instrument port 311, such as Figure 8As shown, the instrument opening 311 is used to cooperate with an instrument, so that medical personnel can use the instrument to insert the instrument into the instrument opening 311 of the distraction screw 300, and screw the second rod 320 into the internal thread 221 connected to the locking groove 211, thereby saving effort and quickly achieving the connection and fixation of the advancement screw 200 and the fixing plate 100.

[0071] In some embodiments, the instrument slot 230 and the instrument opening 311 may be in a straight line shape, a cross shape, a plum blossom shape, or the like.

[0072] It is understandable that, taking the instrument slot 230 as an example, the contact area between the straight instrument slot 230 and the instrument tool is small, making it easy for the instrument slot 230 to slip or wear, resulting in damage to the advancement screw 200. Correspondingly, the straight instrument opening 311 is also prone to damage to the distraction screw 300. Furthermore, when the straight instrument slot 230 connects the outer end surface of the first head 210 and the locking slot 211, it divides the first head 210 into two deformed portions 231. Because the outer end of the cross-section of the first head 210 is circular, the two deformed portions 231 are less likely to deform, making it difficult for the first head 210 to be locked into the screw fixing slot 110.

[0073] It is understandable that the plum blossom-shaped instrument has a large cross-sectional area and is less susceptible to wear on the instrument slot 230 or the instrument opening 311. However, this however complicates the manufacturing process, increasing the cost of the advancement screw 200 and the distraction screw 300. Furthermore, the location of the plum blossom-shaped instrument slot 230 overlaps with the locking slot 211, preventing the distraction screw 300 from being threaded into the locking slot 211. Furthermore, the plum blossom-shaped instrument slot 230 does not easily connect the outer and inner end surfaces of the first head 210, preventing the first head 210 from deforming.

[0074] In this embodiment, the instrument slot 230 and the instrument opening 311 are both cross-shaped. Figure 2 As shown. Taking the instrument slot 230 as an example, the cross-shaped instrument slot 230 provides a greater contact area with the instrument than the straight-shaped instrument slot 230, making the advancement screw 200 less susceptible to damage. Correspondingly, the cross-shaped instrument opening 311 also reduces the damage to the distraction screw 300. Furthermore, the cross-shaped instrument slot 230 divides the first head 210 into four deformable portions 231, making it easier for the first head 210 to be squeezed inward by the walls of the screw fixing slot 110, thereby facilitating the attachment of the advancement screw 200.

[0075] It is understood that the outer end surface shape of the first head 210 corresponds to the groove wall shape of the locking groove 211. That is, the outer end surface and the inner end surface of the first head 210 have the same shape, so that the thickness of the first head 210 along the front-to-back direction is uniformly set, which facilitates extrusion deformation.

[0076] In some embodiments, the outer end surface of the first head 210 is a conical surface, and correspondingly, the groove wall surface of the locking groove 211 is also a conical surface, so that the first head 210 with the retaining ring 240 can be more easily inserted into the screw fixing groove 110.

[0077] In this embodiment, the outer end surface of the first head 210 is a cylindrical surface, and correspondingly, the groove wall surface of the locking groove 211 is also a cylindrical surface. Figure 7 As shown, the first head 210 is more susceptible to deformation under force.

[0078] It can be understood that the groove cross-section of the second locking groove 113 is matched with the outer end surface of the first head 210 .

[0079] It can be understood that when the outer end surface of the first head 210 is a conical surface, the groove wall surface of the second groove 113 is an inclined surface tilted along the front-to-back direction in the projection of the up-down direction, that is, the second groove 113 is a dovetail groove with a larger front and a smaller back.

[0080] In this embodiment, the wall surface of the second slot 113 is a parallel surface extending in a straight line along the front-back direction in the projection of the vertical direction. Figure 5 As shown, the cross section of the second slot 113 is a square. Correspondingly, the outer end surface of the first head 210 is a cylindrical surface.

[0081] It can be understood that the diameter of the outer end surface of the first head 210 corresponds to the groove width of the second slot 113. When the first head 210 is clamped in the screw fixing slot 110, the outer end surface of the first head 210 is connected to the groove wall surface of the second slot 113, thereby improving the stability of the first head 210 and the second slot 113, and preventing the first head 210 from being offset left and right in the second slot 113.

[0082] With such a configuration, when the advancement screw 200 is inserted into the screw fixing groove 110, the contact area between the outer end surface of the first head 210 and the groove cross-section of the second clamping groove 113 can be large, so that when the expansion screw 300 is threaded into the advancement screw 200, the squeezing of the first head 210 and the second clamping groove 113 is smoother, thereby making the advancement screw 200 more firmly clamped on the fixing plate 100.

[0083] It is understandable that, since the second head 310 needs to open the first head 210, the end surface of the second head 310 is a conical surface, such as Figure 3 and Figure 8 Specifically, the front end of the second head portion 310 is larger than the rear end. When the second head portion 310 is inserted into the locking groove 211 from front to back, the conical end surface of the second head portion 310 abuts against the inner end surface of the first head portion 210, i.e., the wall surface of the locking groove 211, thereby causing the first head portion 210, which is divided into multiple deformed portions 231 by the instrument groove 230, to be stretched outward.

[0084] In some embodiments, when the outer end surface of the first head 210 is a conical surface, the taper of the second head 310 is greater than the taper of the locking groove 211 .

[0085] In this embodiment, since the cross section of the locking groove 211 is a cylindrical surface, the minimum diameter of the conical surface of the second head 310 is greater than or equal to the diameter of the locking groove 211 .

[0086] Such an arrangement ensures that the end surface of the second head portion 310 can press the groove wall surface of the locking groove 211 , thereby expanding the first head portion 210 .

[0087] It is understood that a plurality of screw fixing slots 110 are provided and extend along the long end of the fixing plate 100. Specifically, the number of screw fixing slots 110 on the fixing plate 100 is set according to the different surgical scopes of the patient. The plurality of screw fixing slots 110 are arranged at intervals in the vertical direction and extend in the front-to-back direction and respectively connect the front end surface and the rear end surface of the fixing plate 100.

[0088] Generally, one to four screw fixing slots 110 are provided on the fixing plate 100. In this embodiment, two screw fixing slots 110 are provided on the fixing plate 100. Figure 2 and Figure 4 shown.

[0089] It is understood that at least one advancement screw 200 is inserted into each screw fixing slot 110. In this embodiment, two advancement screws 200 are installed in each screw fixing slot 110. Two advancement screws 200 are used for each segmental vertebral body 600 that needs to be advanced to achieve forward traction of the vertebral body 600 toward the fixation plate 100, thereby achieving a tighter connection between the vertebral body 600 and the fixation plate 100.

[0090] It is understood that the fixing plate 100 is provided with fixing screw holes 120 at both ends along the vertical direction. Figure 4 As shown. A bone screw 400 is inserted into the fixing screw hole 120. Figure 1 and Figure 2 As shown, the bone screw 400 passes through the fixing screw hole 120 and is screwed into the vertebral body 600 to achieve connection and fixation between the fixation plate 100 and the vertebral body 600.

[0091] As will be understood, the bone screw 400 comprises a screw head and a screw shaft. The screw head is provided with an instrument interface, facilitating rotation of the bone screw 400 for implantation into the vertebral body 600 through instrumentation. The outer end surface of the screw head is spherical, mating with the fixation screw hole 120. This allows the bone screw 400, inserted into the fixation screw hole 120, to rotate relative to the fixation plate 100, facilitating selection of an appropriate angle for connection with the vertebral body 600. The screw shaft is provided with bone threads for threading into the vertebral body 600.

[0092] In this embodiment, two fixing screw holes 120 are respectively provided at opposite ends of the fixing plate 100, and the two fixing screw holes 120 are symmetrically arranged. Figure 4 and Figure 5 As shown, the fixing plate 100 is locked and fixed to the vertebral body 600 from both the up-down direction and the left-right direction. The instrument interface is an inner hexagonal shape.

[0093] It is understandable that the fixing plate 100 is further provided with a locking hole 140. Figure 5 As shown, the locking hole 140 is provided with a locking piece 500, and the locking piece 500 is provided with an arc notch 520 corresponding to the fixing screw hole 120, as shown in FIG. Figure 1 、 Figure 2 and Figure 4 Specifically, the locking piece 500 is threadedly connected to the locking hole 140, and the locking piece 500 can rotate relative to the fixing plate 100. The arc notch 520 is located in front of the fixing screw hole 120. In the projection in the front-to-back direction, the edges of the arc notch 520 and the fixing screw hole 120 coincide with each other, as shown in FIG. Figure 4 shown.

[0094] With this arrangement, the bone screw 400 can directly pass through the arc notch 520 of the locking plate 500 and the fixing screw hole 120 of the fixing plate 100 from front to back, as shown in FIG. Figure 4 As shown, the screw passes through the fixing screw hole 120 and is nailed into the vertebral body 600, and the spherical screw head is clamped in the fixing screw hole 120. The locking piece 500 is twisted to lock the locking piece 500 to the fixing plate 100. At this time, the arc notch 520 and the fixing screw hole 120 are staggered. In the projection in the front-back direction, the fixing screw hole 120 and a part of the locking piece 500 overlap, thereby locking the screw head of the bone screw 400 between the fixing screw hole 120 and the locking piece 500 to prevent the bone screw 400 from loosening or detaching. Figure 1 and Figure 2 shown.

[0095] Furthermore, a cross groove 510 is provided on the locking piece 500. Figure 4 As shown, it is convenient to insert a screwdriver or other instrument into the cross slot 510 and screw the locking piece 500, so as to simply and quickly realize the relative rotation of the locking piece 500 and the fixing plate 100, and adjust whether the arc notch 520 is staggered with the fixing screw hole 120.

[0096] In this embodiment, since two fixing screw holes 120 are provided at both the upper and lower ends of the fixing plate 100, two locking holes 140 are provided on the fixing plate 100, one of which is located between the two fixing screw holes 120 at the upper end, and the other is located between the two fixing screw holes 120 at the lower end. The locking plate 500 is provided with two arc notches 520. After tightening the locking plate 500, the locking plate 500 covers two symmetrical parts of the fixing screw holes 120. That is, two bone screws 400 can be locked simultaneously by one locking plate 500. The structure is simple and the installation is easy. Figure 1 and Figure 2 shown.

[0097] It is understandable that the fixing plate 100 is provided with a positioning hole 130, such as Figure 2 、 Figure 4 and Figure 5 As shown, the positioning holes 130 are used to temporarily position the fixation plate 100. Specifically, at least two positioning holes 130 are provided and are spaced apart along the long end of the fixation plate 100. That is, the two positioning holes 130 are spaced apart in the vertical direction. Two instruments are respectively inserted into the two positioning holes 130 and then into the vertebral body 600, thereby temporarily positioning the fixation plate 100 on the vertebral body 600, facilitating the installation of the bone screws 400, and eliminating the need for medical personnel to manually hold the fixation plate 100 when driving the bone screws 400.

[0098] It is understandable that the instrument inserted into the positioning hole 130 is a Kirschner wire.

[0099] In this embodiment, the positioning hole 130 is arranged at one end of the locking hole 140 away from the screw fixing groove 110, so that each positioning hole 130 is located between the left and right fixing screw holes 120, and the positioning hole 130 is located at the edge of the fixing plate 100, which does not affect the installation of the bone screw 400 and the advancement screw 200.

[0100] It is understandable that the fixation plate 100 is bent from front to back so that the plate surface of the fixation plate 100 can better fit the curvature of the vertebral body 600 .

[0101] Working principle: When performing anterior cervical vertebral body 600 ossified complex advancement and fusion surgery (ACAF), first arrange the patient's position, grind the front side of the vertebral body 600 to a certain thickness, then groove the left and right sides of the vertebral body 600, cut off the connection between the vertebral body 600 and the left, right and posterior pedicles, place the fixation plate 100 in the pre-installation position, temporarily fix it with a Kirschner wire, and then install the bone screw 400 in the appropriate position of the vertebral body 600. After installation, rotate and tighten the locking plate 500 to prevent the bone screw 400 from falling out.

[0102] Then, the vertebral body 600 that needs to be advanced is pulled toward the fixation plate 100 and fixed with the advancement screw 200. Finally, the distraction screw 300 is screwed in to distract the advancement screw 200 so that the advancement screw 200 is tightly fixed to the fixation plate 100 to prevent the advancement screw 200 from loosening or falling out after surgery.

[0103] The above specifically describes the preferred embodiments of the present invention, but the present invention is not limited to the embodiments. Those skilled in the art may make various equivalent modifications or substitutions without violating the spirit of the present invention. These equivalent modifications or substitutions are all included in the scope defined by the claims of this application.

Claims

1. A self-locking nail plate system for anterior cervical vertebral advancement surgery, characterized in that: Includes: A fixation plate, the fixation plate being connected to the vertebral body and provided with a screw fixing slot extending along the long end thereof; An advancement screw, wherein the head of the advancement screw is provided with a locking groove, the locking groove is connected to an internal thread, and the head of the advancement screw is further provided with an instrument groove for inserting an instrument, the instrument groove communicating with the outer end surface of the advancement screw head and the locking groove, so that when the advancement screw passes through the screw fixing groove, the head of the advancement screw is squeezed and deformed and snapped into the screw fixing groove; A spreading screw is threadedly inserted into the locking groove, and the head of the spreading screw enlarges the head of the advancement screw.

2. The self-locking nail plate system for anterior cervical vertebral advancement surgery according to claim 1, characterized in that: The screw fixing groove includes a first clamping groove, an anti-retreat groove and a second clamping groove arranged in sequence. The groove width of the anti-retreat groove is larger than the groove width of the first clamping groove and the groove width of the second clamping groove. The head of the forward screw is provided with a clamping ring, and the clamping ring is clamped in the anti-retreat groove.

3. The self-locking nail plate system for anterior cervical vertebral advancement surgery according to claim 2, characterized in that: The slot width of the first card slot is greater than the slot width of the second card slot.

4. The self-locking nail plate system for anterior cervical vertebral advancement surgery according to claim 1, characterized in that: The head of the expansion screw is provided with an instrument opening matched with an instrument.

5. The self-locking nail plate system for anterior cervical vertebral advancement surgery according to claim 2, characterized in that: The shape of the outer end surface of the head of the advancement screw corresponds to the shape of the groove wall surface of the locking groove.

6. The self-locking nail plate system for anterior cervical vertebral advancement surgery according to claim 5, characterized in that: The outer end surface of the head of the advancement screw is a cylindrical surface, the groove cross-section of the second clamping groove is a square, and the end surface of the head of the expansion screw is a conical surface.

7. The self-locking nail plate system for anterior cervical vertebral advancement surgery according to claim 1, characterized in that: The screw fixing grooves are provided in plurality and extend along the long end of the fixing plate, and at least one advancement screw is passed through each of the screw fixing grooves.

8. The self-locking nail plate system for anterior cervical vertebral advancement surgery according to claim 1, characterized in that: Two opposite ends of the fixing plate are each provided with a fixing screw hole, and bone screws are passed through the fixing screw holes.

9. The self-locking nail plate system for anterior cervical vertebral advancement surgery according to claim 8, characterized in that: The fixing plate is threadedly connected with a locking piece, and the locking piece is provided with an arc notch corresponding to the fixing screw hole. The bone screw passes through the arc notch and the fixing screw hole. The locking piece is tightened so that the arc notch and the fixing screw hole are staggered.

10. The self-locking nail plate system for anterior cervical vertebral advancement surgery according to claim 8, characterized in that: The fixing plate is provided with a positioning hole for temporary positioning.

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