Multi-fixed wing pre-fabricated peek plate for skull defect filling

Abstract

This utility model relates to a multi-wing prefabricated PEEK plate for filling skull defects, comprising a plate body made of PEEK material. The plate body has a covering surface for covering a bone window and multiple radially outwardly extending fixing wings. The periphery of the covering surface has multiple arc-shaped radially concave depressions, each depression spaced circumferentially. Each depression corresponds to one fixing wing, and each fixing wing has screw holes for screws to pass through. The root of each fixing wing is a raised arched portion, which is spaced opposite to the depressions and connected to them by multiple spaced connecting ribs. Each fixing wing is easily cut off, and the surgeon can select the number of fixing wings according to the patient's condition. After the fixing wings are cut off, the depressions create a concave area at the edge of the covering surface, effectively avoiding the mastoid process, preventing interference between the plate and the skull and affecting the fixation effect, thus reducing surgical risks.

Description

Technical Field

[0001] This utility model relates to a medical device, and more particularly to a multi-wing prefabricated PEEK plate for filling skull defects. Background Technology

[0002] Trigeminal neuralgia is a common neurological disorder characterized by recurrent episodes of severe facial pain, which typically appears suddenly. Attacks are often triggered by facial movements or contact, such as chewing, speaking, washing the face, or shaving. The pain is often described as "electric shock-like," meaning it is intense and sudden, like an electric current shooting through the face, causing immense suffering. The pain is usually localized to one side of the face, particularly the upper or lower jaw area, and the location is usually fixed and does not change over time. The cause of trigeminal neuralgia is often related to vascular compression of the trigeminal nerve root. Prolonged stimulation of a normal nerve by vascular pulsation can lead to demyelination, causing abnormal electrical discharges and severe pain. Trigeminal nerve decompression surgery involves separating the blood vessel compressing the nerve (the "responsible vessel") and inserting a pad (such as a cotton pad or a special material) between them to block the mechanical stimulation of the nerve, thus curing the pain. This procedure preserves nerve function and avoids the loss of facial sensation caused by traditional destructive surgeries (such as nerve resection).

[0003] Trigeminal nerve decompression surgery is an effective surgical method for treating trigeminal neuralgia and hemifacial spasm. Surgical steps:

[0004] 1. Perform routine disinfection, make a retromastoid incision, and cut the skin.

[0005] 2. Expose the occipital bone and create a bone window.

[0006] 3. Gently pull the cerebellar hemisphere inward.

[0007] 4. Separate the arachnoid membrane and release cerebrospinal fluid.

[0008] 5. Expose the trigeminal nerve.

[0009] 6. Dissect the arachnoid membrane around the nerve root and carefully identify the responsible vessel (usually the internal and external branches of the superior cerebellar artery).

[0010] 7. Separate the nerve from the responsible blood vessel, and properly pad them with Teflon cotton.

[0011] 8. Suture the dura mater, repair bone defects, and suture the fascia and skin in layers.

[0012] Current trigeminal nerve decompression surgery involves creating a window in the skull, resulting in a skull defect and affecting the integrity of the patient's skull. Post-operatively, a snowflake-shaped fixation plate is used to cover the skull defect and secure it. For example, the Chinese utility model patent application ZL201822179471.X, "Stabilizing Titanium Plate for the Skull," discloses such a snowflake-shaped fixation plate, comprising a directly bent, arched titanium substrate. The substrate has multiple fixing ears extending outwards along its curved surface, spaced circumferentially. Each ear has a main positioning hole for inserting a titanium screw. However, as shown in the figure, this snowflake-shaped fixation method cannot completely cover the skull window, and the curvature of the snowflake cannot adequately match the curvature of the defective bone window, affecting the aesthetics of the patient's skull. Summary of the Invention

[0013] The technical problem to be solved by this utility model is to provide a multi-fixed-wing prefabricated PEEK plate for filling skull defects, which has a reasonable structure, can actually fill bone window defects, and the fixing wings can be easily separated from the substrate.

[0014] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows: a multi-fixed-wing prefabricated PEEK plate for filling skull defects, comprising a plate body made of PEEK material, characterized in that: the plate body has a covering surface for covering the bone window and multiple radially outwardly extending fixing wings, the periphery of the covering surface has multiple arc-shaped radially concave recesses, each recess is spaced apart along the circumference, each recess is provided with a corresponding fixing wing, each fixing wing is provided with a screw hole for screws to pass through, the root of the fixing wing is a raised arched part, the arched part and the recessed part are spaced apart and opposite each other, and the arched part and the recessed part are connected together by multiple spaced connecting ribs.

[0015] To facilitate the cutting of the connecting ribs, the top surface of the connecting ribs has a concave cutting groove. The cutting groove also makes it convenient for doctors to use tools to make radial cuts along a preset trajectory.

[0016] Preferably, there is an arc-shaped transition between two adjacent recesses.

[0017] Alternatively, there are six recesses and six fixing wings. The doctor can choose how many fixing wings need to be cut, depending on the patient's condition.

[0018] A further improvement is made to the aforementioned fixation wing, which has a break groove in the middle, with pin holes on both sides of the break groove. The break groove allows the surgeon to easily break the fixation wing and select the appropriate length for fixation as needed during surgery, thus enhancing its adaptability.

[0019] Preferably, the aforementioned nail hole has a small hole portion and a large hole portion. The small hole portion penetrates the lower surface of the fixed wing and communicates with the large hole portion, while the large hole portion penetrates the upper surface of the fixed wing. The large hole portion can conceal the head of the titanium nail within it and provides better restraint for the head.

[0020] In a further improvement, the aforementioned plate also has a filling protrusion located below the covering surface for filling into the bone window. The filling protrusion fills into the bone window, resulting in a more stable bond between the plate and the skull.

[0021] As an improvement, the peripheral surface of the aforementioned filling protrusion is inclined from top to bottom towards the center. The inclined peripheral surface of the filling protrusion provides a certain guiding effect when the protrusion enters the bone window, which is beneficial for the filling protrusion to enter the bone window.

[0022] Preferably, the periphery of the aforementioned filling boss is formed by multiple arc-shaped segments.

[0023] To enhance the bonding effect between soft tissue and the implant surface, the plate is provided with multiple flow holes that penetrate the covering surface and filling protrusion along the thickness direction.

[0024] Compared with the prior art, the advantages of this utility model are as follows: The plate has a covering surface and fixing wings. The covering surface covers the top opening of the bone window, ensuring full coverage. Multiple fixing wings are set around the periphery and fixed to the skull with titanium screws to fix the plate. This better adapts to and covers the curvature of the skull defect. The fixing wings and the recessed part are connected by multiple spaced connecting ribs. The cross-section of the connecting ribs is smaller than the cross-section of the overall connection, and each fixing wing can be easily cut off. The doctor can choose the number of fixing wings according to the patient's condition. After the fixing wings are cut off, the recessed part creates a recessed area at the edge of the covering surface. The recessed area can effectively avoid the mastoid process, prevent the plate from interfering with the skull and affecting the fixation effect, and reduce surgical risks. Attached Figure Description

[0025] Figure 1 This is a three-dimensional structural diagram of an embodiment of the present utility model. Figure 1 ;

[0026] Figure 2 This is a three-dimensional structural diagram of an embodiment of the present utility model. Figure 1 ;

[0027] Figure 3 This is a cross-sectional view of an embodiment of the present utility model;

[0028] Figure 4 This is a usage diagram of an embodiment of the present utility model. Detailed Implementation

[0029] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0030] like Figures 1-4 The image shown is the first embodiment of this utility model.

[0031] A multi-wing prefabricated PEEK plate for filling skull defects includes a plate body 1 made of PEEK material. The plate body 1 has a covering surface 11 for covering the bone window and multiple radially outwardly extending fixing wings 2. The periphery of the covering surface 11 has multiple arc-shaped radially concave recesses 1a, each recess 1a is arranged circumferentially, and there is an arc transition between adjacent recesses 1a.

[0032] Each recess 1a corresponds to one fixing wing 2. In this embodiment, there are six recesses 1a and six fixing wings 2. Each fixing wing 2 has a screw hole 21 for screws to pass through. The inner end of the fixing wing 2 is a raised arched portion 23, which is spaced apart from the recesses 1a and connected to each other by multiple spaced connecting ribs 13. The top surface of the connecting rib 13 has a concave cut-off groove 131.

[0033] The fixed wing 2 has a break groove 22 in the middle, and the pin holes 21 are provided on both sides of the break groove 22. The break groove 22 is designed to allow the surgeon to break the fixed wing 2 and select the length of fixation as needed during the operation, making it more adaptable. The pin holes 21 have a small hole 2a and a large hole 2b. The small hole 2a penetrates the lower surface of the fixed wing 2 and communicates with the large hole 2b, while the large hole 2b penetrates the upper surface of the fixed wing 2.

[0034] The plate 1 also has a filling boss 12 located below the covering surface 11 for filling into the bone window. The peripheral surface 121 of the filling boss 12 slopes from top to bottom towards the center. The peripheral surface 121 of the filling boss 12 is formed by multiple arc-shaped joints.

[0035] The plate 1 is provided with a plurality of flow holes 1b that penetrate the covering surface 11 and the filling boss 12 along the thickness direction.

[0036] The specific manufacturing process is as follows.

[0037] 1. Reverse reconstruction: Based on the patient's CT data, the patient's bones with complete, accurate and clear boundary contours are extracted by combining threshold segmentation, manual selection segmentation and other methods.

[0038] 2. Design of the curvature and dimensions of the prefabricated PEEK plate: The design curvature and dimensions of the prefabricated PEEK plate were based on 300 actual clinical cases. 3D reconstruction was performed on the CT data of these 300 cases to measure the size and curvature of the bone window defect after trigeminal nerve decompression surgery. Design parameters were derived through data analysis to better cover the bone window defect and adapt to its curvature.

[0039] 3. Design Features of Prefabricated PEEK Plates: The design features of the prefabricated PEEK plates were based on 300 actual clinical cases. For example... Figure 4 As shown, the plate consists of an upper circular covering surface 11 and a lower bone window filling protrusion 12. Six radially concave, arc-shaped depressions 1a are distributed around the periphery of the covering surface 11. Each depression 1a corresponds to a fixing wing 2. The inner end of the fixing wing 2 is a raised arched portion 23, which is spaced apart from the depression 1a and connected to the depression 1a by multiple spaced connecting ribs 13. This design allows for easy cutting of all six fixing wings 2, and the surgeon can select the number of fixing wings 2 according to the patient's condition. After the fixing wings 2 are cut, the depressions 1a create a concave area at the edge of the covering surface 11, effectively avoiding the mastoid process and preventing interference between the plate 1 and the skull, thus reducing the fixation effect and surgical risk. The fixing wings 2 have a breakage groove 22, allowing for breakage as needed during surgery. A flow hole 1b is designed in the central area of ​​the prefabricated PEEK plate's circumferential covering surface to facilitate surgery and postoperative recovery.

[0040] It should be noted that in the description of this embodiment, the terms "front," "rear," "left," "right," "inner," "outer," "upper," and "lower," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are merely for the convenience of describing the invention 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 the invention. 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 communication between two elements. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

Claims

1. A multi-wing prefabricated PEEK plate for filling skull defects, comprising a plate body (1) made of PEEK material, characterized in that: The plate (1) has a covering surface (11) for covering the bone window and a plurality of radially outwardly extending fixing wings (2). The periphery of the covering surface (11) has a plurality of arc-shaped radially concave recesses (1a). Each recess (1a) is spaced apart along the circumference. Each recess (1a) is provided with a fixing wing (2). Each fixing wing (2) is provided with a screw hole (21) for screws to pass through. The inner end of the fixing wing (2) is a raised arched part (23). The arched part (23) and the recessed part (1a) are spaced apart and are connected together by a plurality of spaced connecting ribs (13).

2. The multi-wing prefabricated PEEK plate for filling skull defects according to claim 1, characterized in that: The top surface of the connecting rib (13) has a concave cut-off groove (131).

3. The multi-wing prefabricated PEEK plate for filling skull defects according to claim 1, characterized in that: There is an arc-shaped transition between two adjacent recesses (1a).

4. The multi-wing prefabricated PEEK plate for filling skull defects according to claim 1, characterized in that: There are six recesses (1a) and six fixed wings (2).

5. The multi-wing prefabricated PEEK plate for filling skull defects according to claim 1, characterized in that: The fixed wing (2) has a break groove (22) in the middle, and the nail holes (21) are provided on both sides of the break groove (22).

6. The multi-wing prefabricated PEEK plate for filling skull defects according to claim 1, characterized in that: The nail hole (21) has a small hole (2a) and a large hole (2b). The small hole (2a) penetrates the lower surface of the fixed wing (2) and communicates with the large hole (2b). The large hole (2b) penetrates the upper surface of the fixed wing (2).

7. The multi-wing prefabricated PEEK plate for filling skull defects according to any one of claims 1 to 6, characterized in that: The plate (1) also has a filling boss (12) located below the covering surface (11) for filling into the bone window.

8. The multi-wing prefabricated PEEK plate for filling skull defects according to claim 7, characterized in that: The peripheral surface (121) of the filling boss (12) is inclined from top to bottom towards the center.

9. The multi-wing prefabricated PEEK plate for filling skull defects according to claim 8, characterized in that: The peripheral surface (121) of the filling boss (12) is formed by connecting multiple arc surfaces.

10. The multi-wing prefabricated PEEK plate for filling skull defects according to claim 7, characterized in that: The plate (1) is provided with a plurality of flow holes (1b) that penetrate the covering surface (11) and the filling boss (12) along the thickness direction.

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