Precast PEEK plates for filling skull defects after trigeminal nerve decompression surgery

Abstract

This utility model relates to a prefabricated PEEK plate for filling skull defects after trigeminal nerve decompression surgery. It includes a plate body made of PEEK material, characterized in that: the plate body has a covering surface for covering the bone window, and filling protrusions located below the covering surface for filling into the bone window. The periphery of the covering surface has multiple outwardly extending fixing wings, each fixed wing spaced circumferentially, and each fixing wing has a screw hole for screws to pass through. The covering surface covers the top opening of the bone window, ensuring full coverage. The filling protrusions fill into the bone window, making the plate body more stable in its connection with the skull. The multiple fixing wings along the periphery are fixed to the skull with titanium screws, thus achieving plate fixation.

Description

Technical Field

[0001] This utility model relates to a medical device, and more particularly to a prefabricated PEEK plate for filling skull defects after trigeminal nerve decompression surgery. Background Technology

[0002] Trigeminal neuralgia is a common cranial nerve disorder characterized by recurrent paroxysmal severe pain in the distribution area of ​​the trigeminal nerve on one side of the face. The incidence rate in China is estimated at 52.2 per 100,000, with slightly more women than men, and the incidence increases with age. Trigeminal neuralgia mostly occurs in middle-aged and elderly people, and is more common on the right side than the left. The disease is characterized by sudden onset and cessation of intense, lightning-like, stabbing, burning, persistent, and unbearable pain in the distribution area of ​​the trigeminal nerve in the head and face. Speaking, washing the face, brushing teeth, a gentle breeze, or even walking can trigger paroxysmal severe pain. The pain lasts for seconds or minutes, and occurs periodically, with normal intervals between attacks.

[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 has the following problems: Existing trigeminal nerve decompression surgery involves creating a window in the skull, resulting in skull defects and affecting the integrity of the patient's skull. Postoperatively, a snowflake-shaped fixation plate is used to cover the skull defect and fix it. For example, the Chinese utility model patent application ZL201822179471.X, "Stabilizing Titanium Plate for the Skull," discloses such a snowflake-shaped fixation titanium plate, including a titanium substrate with a circularly arched shape formed by direct bending. The periphery of the titanium substrate has multiple fixing ears extending outward along the arc surface of the titanium substrate, spaced circumferentially. Each fixing ear has a main positioning hole for inserting a titanium screw. As shown in the figure, however, the aforementioned snowflake-shaped fixation method cannot completely cover the skull window, and the curvature of the snowflake cannot well adapt to the curvature of the defective skull 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 prefabricated PEEK plate with a reasonable structure that can actually fill bone window defects after trigeminal nerve decompression surgery, which is in contrast to the above-mentioned prior art.

[0014] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows: a prefabricated PEEK plate for filling skull defects after trigeminal nerve decompression surgery, comprising a plate body made of PEEK material, characterized in that: the plate body has a covering surface for covering the bone window and a filling protrusion located below the covering surface for filling into the bone window, the periphery of the covering surface has a plurality of outwardly extending fixing wings, each fixing wing is arranged at intervals along the circumference, and each fixing wing is provided with a screw hole for screws to pass through.

[0015] In a further improvement, a concave clearance area is provided on one side of the aforementioned covering surface, and the fixing wing is located outside the clearance area. The arc-shaped clearance area is used to avoid the mastoid process, prevent the plate from interfering with the skull and affecting the fixation effect, and reduce surgical risks.

[0016] 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.

[0017] 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.

[0018] 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.

[0019] 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.

[0020] Preferably, the periphery of the aforementioned filling boss is formed by multiple arc-shaped segments.

[0021] Alternatively, the aforementioned fixed wings can be three or four. The specific choice can be made by the doctor based on the patient's condition.

[0022] Compared with existing technologies, the advantages of this invention are as follows: The plate is divided into two parts: a covering surface and a filling protrusion. The covering surface covers the top opening of the bone window, ensuring full coverage. The filling protrusion fills the bone window, making the plate more stable in its connection with the skull. Furthermore, multiple fixing wings around the periphery are fixed to the skull with titanium screws, thus securing the plate. Therefore, this prefabricated PEEK plate can better adapt to and cover a large area of ​​skull defects. Attached Figure Description

[0023] Figure 1 This is a three-dimensional structural diagram of an embodiment of the present utility model. Figure 1 ;

[0024] Figure 2 This is a three-dimensional structural diagram of an embodiment of the present utility model. Figure 1 ;

[0025] Figure 3 This is a cross-sectional view of an embodiment of the present utility model;

[0026] Figure 4 This is a usage diagram of an embodiment of the present utility model. Detailed Implementation

[0027] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0028] like Figures 1-4 The image shown is the first embodiment of this utility model.

[0029] A prefabricated PEEK plate for filling skull defects after trigeminal nerve decompression surgery includes a plate body 1 made of PEEK material. The plate body 1 has a covering surface 11 for covering a bone window and a filling protrusion 12 located below the covering surface 11 for filling into the bone window. The peripheral surface 121 of the filling protrusion 12 slopes from top to bottom towards the center. The peripheral surface 121 of the filling protrusion 12 is formed by connecting multiple arc surfaces. The periphery of the covering surface 11 has multiple outwardly extending fixing wings 2, with three or four fixing wings 2. Each fixing wing 2 is spaced apart along the circumference, and each fixing wing 2 has a screw hole 21 for screws to pass through. The screw hole 21 has a small hole portion 2a and a large hole portion 2b. The small hole portion 2a penetrates the lower surface of the fixing wing 2 and communicates with the large hole portion 2b, while the large hole portion 2b penetrates the upper surface of the fixing wing 2.

[0030] One side of the covering surface 11 has a concave clearance area Q, and the fixing wing 2 is located outside the clearance area Q. The arc-shaped clearance area Q is used to avoid the mastoid process, prevent the plate 1 from interfering with the skull and affecting the fixation effect, and reduce surgical risks.

[0031] 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 makes it convenient for doctors to break the fixed wing 2 and select the length of fixation according to the needs of the operation, thus making it more adaptable.

[0032] The plate 1 is provided with a plurality of flow holes 13 that penetrate the covering surface 11 and the filling boss 12 along the thickness direction.

[0033] The specific manufacturing process is as follows.

[0034] 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.

[0035] 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 200 actual clinical cases. 3D reconstruction was performed on the CT data of these 200 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.

[0036] 3. Prefabricated PEEK Plate Design Features: The design features of the prefabricated PEEK plate were based on 200 actual clinical cases. It consists of an upper circumferential covering surface 11 and a lower bone window filling protrusion. An arc-shaped clearance area Q is designed on the circumferential covering surface 11 to avoid the mastoid process and prevent interference between the prefabricated PEEK plate and the skull, thus ensuring effective fixation. Three fixation wings 2 are designed according to the clinical protocol, working in conjunction with titanium screws to achieve fixation. The fixation wings 2 have breakage grooves 22, allowing for breakage as needed during surgery. A flow hole 13 is designed in the central area of ​​the circumferential covering surface of the prefabricated PEEK plate to facilitate surgery and postoperative recovery.

[0037] like Figure 4 As shown, the plate 1 is divided into two parts: a covering surface 11 and a filling protrusion 12. The covering surface 11 covers the top opening of the bone window, and the filling protrusion 12 fills into the bone window, ensuring that the covering surface 11 fully covers the bone window. Because the filling protrusion 12 fills into the bone window, the plate 1 is more stably integrated with the skull. Furthermore, multiple fixing wings 2 are set around the periphery, and the fixing wings 2 are fixed to the skull with titanium screws to achieve the fixation of the plate 1. Therefore, this prefabricated PEEK plate can better adapt to and cover a large area of ​​skull defect curvature.

[0038] 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 prefabricated PEEK plate for filling skull defects after trigeminal nerve decompression surgery, 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 filling boss (12) located at the lower part of the covering surface (11) for filling into the bone window. The periphery of the covering surface (11) has a plurality of outwardly extending fixing wings (2), each fixing wing (2) is spaced apart along the circumference, and each fixing wing (2) is provided with a screw hole (21) for screws to pass through.

2. The prefabricated PEEK plate for filling skull defects after trigeminal nerve decompression surgery according to claim 1, characterized in that: The periphery of one side of the covering surface (11) is provided with a recessed air-avoidance area (Q), and the fixed wing (2) is located outside the air-avoidance area (Q).

3. The prefabricated PEEK plate for filling skull defects after trigeminal nerve decompression surgery 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).

4. The prefabricated PEEK plate for filling skull defects after trigeminal nerve decompression surgery according to claim 1, characterized in that: The plate (1) is provided with a plurality of flow holes (13) that penetrate the covering surface (11) and the filling boss (12) along the thickness direction.

5. The prefabricated PEEK plate for filling skull defects after trigeminal nerve decompression surgery 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).

6. The prefabricated PEEK plate for filling skull defects after trigeminal nerve decompression surgery according to claim 1, characterized in that: The peripheral surface (121) of the filling boss (12) is inclined from top to bottom towards the center.

7. The prefabricated PEEK plate for filling skull defects after trigeminal nerve decompression surgery according to claim 6, characterized in that: The peripheral surface (121) of the filling boss (12) is formed by connecting multiple arc surfaces.

8. The prefabricated PEEK plate for filling skull defects after trigeminal nerve decompression surgery according to claim 6, characterized in that: The fixed wing (2) has three or four winglets.

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