A craniofacial bone plate

Abstract

This utility model relates to a craniofacial bone plate, comprising a base plate (1), wherein the base plate (1) has a plurality of positioning holes (2) through which screws (4) pass to fix the base plate (1) to the bone surface. The base plate (1) is characterized in that: the base plate (1) has a central plate body (11) and connecting plates (12) located on both sides of the central plate body (11). The central plate body (11) has a strip-shaped adjustment hole (3), and each connecting plate (12) has at least one of the positioning holes (2). The first width (d1) of the adjustment hole (3) is greater than the outer diameter of the shank of the screw (4). In use, one side of the connecting plate is fixed to the bone surface on one side of the suture with a screw, and then another screw is used to pre-fix it to the bone surface on the other side of the suture through the adjustment hole. The head of the adjustment screw directly or indirectly applies pre-pressure to the base plate, but the base plate can swing around the screw fixing the connecting plate for fine adjustment. After swinging to a suitable position, the other side of the connecting plate is fixed to the bone surface with a screw, thus achieving the final fixation of the bone plate.

Description

Technical Field

[0001] This utility model relates to a fixation device for orthognathic surgery, and more particularly to a craniofacial bone plate for orthognathic surgery. Background Technology

[0002] Dentofacial deformities refer to abnormalities in the volume and shape of the jawbone, as well as the relationships between the upper and lower jaws and with other craniofacial bones, caused by abnormal jawbone development. These abnormalities are accompanied by jaw and tooth relationships, dysfunction of the stomatognathic system, and facial morphology. Orthognathic surgery aims to correct misaligned teeth, adjust uncoordinated dental arches and jaw relationships, eliminate jaw interference, align the teeth, eliminate compensatory tilting of the teeth, and facilitate the smooth movement of the incised bone segments to the designed corrective position during surgery, establishing a good jaw relationship. Currently, orthognathic surgery mainly involves two methods: arch splinting with intermaxillary traction and fixation with mini-plates or compression plates. The arch splinting with intermaxillary traction method restricts the patient's mouth opening, limiting postoperative occlusion and functional rehabilitation training after fractures, affecting fracture healing and increasing patient suffering.

[0003] The structure of a miniature steel plate includes a steel plate base with multiple small fixing holes spaced apart. In use, the steel plate base is placed between the two fractured mandibles, and then a special screw is passed through two or more fixing holes to fix it to the mandible. The fractured mandible gradually heals under the fixation of the miniature steel plate. For example, Chinese utility model patent CN91203346.0 (publication number CN2091138Y) entitled "Miniature Steel Plate Fixator for Maxillofacial Fractures," and Chinese invention patent CN201110071413.5 (publication number CN102688085A) entitled "Locking Compression Bone-Setting Device and Its Use" both disclose such a miniature steel plate.

[0004] Existing bone plates are directly fixed to the bone surface with screws on both sides. This fixation method is inconvenient for fine-tuning. In actual surgical situations, the actual situation may be quite complex, and initial fixation may not be achieved in one go, requiring fine-tuning. However, the fixation structure of existing bone plates is not suitable for fine-tuning. During adjustment, the screws on one side must be unscrewed before fine-tuning can be performed. After fine-tuning, refixation may be difficult because the previous holes on the bone surface remain, and the holes may be too large, resulting in insecure fixation and causing secondary injury to the patient.

[0005] In conclusion, existing bone plates can be further improved. Utility Model Content

[0006] The technical problem to be solved by this utility model is to provide a craniofacial bone plate with a more reasonable shape and structure and which is convenient for fine-tuning the position of the bone plate during surgery, in contrast to the above-mentioned prior art.

[0007] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows: a craniofacial bone plate, including a base plate, wherein the base plate has a plurality of positioning holes for screws to pass through and fix the base plate to the bone surface, characterized in that: the base plate has a central plate body and connecting plates located on both sides of the central plate body, the central plate body has a strip-shaped adjustment hole, and each connecting plate body is provided with at least one positioning hole, the first width of the adjustment hole being greater than the outer diameter of the screw shank.

[0008] Preferably, the line connecting the centerline of the adjustment hole along its length and the center of each positioning hole is on the same straight line.

[0009] As an improvement, the connecting plate has a material-removing hole. The material-removing hole reduces the overall weight of the bone plate.

[0010] Further improvements include the addition of scale lines along the length of the adjustment holes on the central plate. These scale lines serve as coordinate indicators for fine-tuning the bone plate, ensuring that it is ultimately fixed in the correct position with greater precision.

[0011] If there are too few positioning holes, the bone plate will be difficult to fix securely; if there are too many positioning holes, the bone surface will be damaged. As a preferred option, each of the connecting plates is provided with two positioning holes.

[0012] The connecting plate has an arc-shaped recess in the middle part along the central axis.

[0013] Preferably, the positioning hole has a large hole and a small hole arranged coaxially. The large hole is tapered, and the small hole is straight. The first depth of the large hole is twice or more the second depth of the small hole. This allows for installation and fixation using ordinary titanium nails, with the nail head concealed within the large hole. Furthermore, the tapered wall of the large hole provides centering for nail insertion. The first depth of the large hole, being twice or more the second depth of the small hole, better ensures the nail head is concealed within it.

[0014] Preferably, the boundaries of the aforementioned substrate are rounded, resulting in gentler contact with the patient's soft tissue.

[0015] To facilitate fine-tuning, a pressure block is also included. This pressure block has a strip-shaped hole, the length of which is greater than the first width of the adjustment hole, and the second width of which is less than the screw head diameter. The first width of the adjustment hole is greater than the screw head diameter. In use, one side of the connecting plate is fixed to the bone surface on one side of the suture with a screw. The pressure block is placed on the top surface of the middle plate of the base plate. The screw, passing through the strip-shaped hole and the adjustment hole, is pre-fixed to the bone surface on the other side of the suture. The screw applies a pre-pressure to the base plate through the pressure block. This pre-pressure is not very large, enough to roughly fix the base plate, but the base plate can swing around the screw fixing the connecting plate for fine-tuning. After swinging to the appropriate position, the other side of the connecting plate is then fixed to the bone surface on the other side of the suture with a screw, achieving final fixation of the bone plate.

[0016] Compared with the prior art, the advantages of this utility model are as follows: In use, one side of the connecting plate is fixed to the bone surface on one side of the bone suture with a screw, and another screw is used to pre-fix it to the bone surface on the other side of the bone suture through the adjustment hole. The head of the adjustment screw directly or indirectly applies pre-pressure to the base plate. The pre-pressure is not very large, which can roughly fix the base plate, but the base plate can swing around the screw fixing the connecting plate for fine adjustment. After swinging to the appropriate position, the other side of the connecting plate is fixed to the bone surface with a screw to achieve the final fixation of the bone plate. Since the adjustment hole is strip-shaped, the position of the screw passing through the adjustment hole can be arbitrarily selected, and the fixing position of the adjustment screw has a wide range of options. Attached Figure Description

[0017] Figure 1 This is a top view of an embodiment of the present utility model;

[0018] Figure 2 for Figure 1 Sectional view along axis AA;

[0019] Figure 3 This is a top view of the pressure block in an embodiment of this utility model;

[0020] Figure 4 This is a cross-sectional view of the pressure block in an embodiment of this utility model;

[0021] Figure 5 This is a usage state diagram of an embodiment of the present utility model;

[0022] Figure 6 This is a schematic diagram of the screw in an embodiment of the present invention. Detailed Implementation

[0023] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0024] like Figures 1-6 The figure shown is a preferred embodiment of the present invention.

[0025] A craniofacial bone plate includes a base plate 1 with multiple positioning holes 2 for screws 4 to pass through and fix the base plate 1 to the bone surface. The wall thickness H of the base plate 1 is 0.6 mm, and the overall width is 6 mm. The positioning holes 2 have a large hole portion 21 and a small hole portion 22 coaxially arranged. The large hole portion 21 is a conical hole, and the small hole portion 22 is a straight hole. The first depth h1 of the large hole portion 21 is twice or more than the second depth h2 of the small hole portion 22. Specifically, the first depth h1 is 0.5 mm, and the second depth h2 is 0.2 mm.

[0026] The substrate 1 has a central plate 11 and connecting plates 12 located on both sides of the central plate 11. The connecting plates 12 have an arc-shaped recess 14 in the center along the central axis. The boundary of the substrate 1 is rounded. The central plate 11 has a strip-shaped adjustment hole 3, and each connecting plate 12 has at least one positioning hole 2. The first width d1 of the adjustment hole 3 is greater than the outer diameter of the shank of the screw 4. The first width d1 is 4.4 mm, and the line connecting the center axis X of the adjustment hole 3 along its length direction and the center of each positioning hole is on the same straight line.

[0027] Each of the connecting plates 12 is provided with two positioning holes 2. A material-stealing hole 5 is opened on the connecting plate 12. The material-stealing hole 5 is located between the two positioning holes 2.

[0028] The scale line 13 is set along the length of the adjustment hole 3 on the middle plate 11. The scale line 13 serves as a coordinate indicator for the fine adjustment of the bone plate, ensuring that the bone plate is finally fixed in the correct position more accurately.

[0029] It also includes a pressure block 6, which has a strip hole 61. The length L of the strip hole 61 is greater than the first width d1 of the adjustment hole 3, the second width d2 of the strip hole 61 is less than the head diameter of the screw 4, and the first width d1 of the adjustment hole 3 is greater than the head diameter of the screw 4.

[0030] When using, such as Figure 5 As shown, the connecting plate 12 on one side is fixed to the bone surface on one side of the suture P by a screw 4. The pressure block 6 is placed on the top surface of the middle plate 11 of the base plate 1. The screw 4 is pre-fixed to the bone surface on the other side of the suture P by passing through the strip hole 61 and the adjustment hole 3. The screw 4 applies a pre-pressure to the base plate 1 through the pressure block 6. The pre-pressure is not very large, which can roughly fix the base plate 1. However, the base plate 1 can swing around the screw 4 that fixes the connecting plate 12 for fine adjustment. After swinging to the appropriate position, the connecting plate 12 on the other side is fixed to the bone surface on the other side of the suture P by the screw 4. Finally, all screws 4 are tightened to achieve the final fixation of the bone plate.

[0031] It should be noted that in the description of this embodiment, the terms "front," "rear," "left," "right," "up," "down," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings. They are merely for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. The terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

Claims

1. A craniofacial bone plate, comprising a base plate (1), wherein the base plate (1) has a plurality of positioning holes (2) through which screws (4) pass to fix the base plate (1) to the bone surface, characterized in that: The substrate (1) has a central plate (11) and connecting plates (12) located on both sides of the central plate (11). The central plate (11) has a strip-shaped adjustment hole (3). Each connecting plate (12) has at least one positioning hole (2). The first width (d1) of the adjustment hole (3) is greater than the outer diameter of the shank of the screw (4).

2. The craniofacial bone plate according to claim 1, characterized in that: The line connecting the centerline (X) of the adjustment hole (3) along its length direction to the center of each positioning hole is on the same straight line.

3. The craniofacial bone plate according to claim 1, characterized in that: The connecting plate (12) has a material-stealing hole (5).

4. The craniofacial bone plate according to claim 1, characterized in that: The scale line (13) is set on the middle plate (11) along the length direction of the adjustment hole (3).

5. The craniofacial bone plate according to claim 1, characterized in that: Each of the connecting plates (12) is provided with two positioning holes (2).

6. The craniofacial bone plate according to claim 5, characterized in that: The middle part of the connecting plate (12) has an arc-shaped recess (14) that is concave inward along the central axis.

7. The craniofacial bone plate according to claim 1, characterized in that: The positioning hole (2) has a large hole (21) and a small hole (22) arranged coaxially. The large hole (21) is a tapered hole, and the small hole (22) is a straight hole. The first depth (h1) of the large hole (21) is twice or more the second hole depth (h2) of the small hole (22).

8. The craniofacial bone plate according to claim 1, characterized in that: The boundary of the substrate (1) is circularly transitioned.

9. The craniofacial bone plate according to claim 1, characterized in that: It also includes a pressure block (6), on which a strip hole (61) is opened. The length (L) of the strip hole (61) is greater than the first width (d1) of the adjustment hole (3), the second width (d2) of the strip hole (61) is less than the head diameter of the screw (4), and the first width (d1) of the adjustment hole (3) is greater than the head diameter of the screw (4).

Images