Adjustable skull clamp

Abstract

The application discloses an adjustable skull lock and relates to the technical field of medical devices. Technical points are as follows: the skull lock comprises an upper cover piece, a through hole is arranged on the upper cover piece, a stand is arranged in the through hole and connected with the through hole through a first locking assembly, one side of the upper end of the stand is provided with a mounting groove, the upper end of the mounting groove is fixed on the upper cover piece, a lower cover piece is arranged below the other opposite side of the stand, a plug is arranged in the mounting groove and connected with the mounting groove through a second locking assembly, and the lower end of the plug is fixedly connected with the upper cover piece. The upper cover piece and the lower cover piece in the skull lock can fix the skull of a patient, the upper cover piece and the upper cover piece tooth can fix the skull prosthesis, so that the skull lock can be applied to the fixation of various free bone flaps, artificial skull prosthesis implant bodies with different thicknesses and original skulls, and the problem of skull fixation failure caused by the thickness difference between the skull of a patient and a skull prosthesis in the prior art can be effectively solved.

Description

Technical Field

[0001] This application relates to the field of medical device technology, and in particular to an adjustable cranial lock. Background Technology

[0002] In current clinical cranioplasty, due to surgical trauma or craniotomy, it is necessary to fix the patient's free bone flap or artificial cranial prosthesis implant to the patient's original skull defect bone window after surgery in order to restore the original anatomical structure of the skull.

[0003] Currently, the main types of cranial locking devices used for skull fixation in clinical practice are titanium cranial locking devices and polymeric material cranial locking devices (such as polyetheretherketone (PEEK)). Both titanium and PEEK cranial locking devices employ a design with upper and lower cover plates of identical size. Existing cranial locking devices include an upper cover plate and a lower cover plate. The upper cover plate has a through hole with a first ratchet tooth inside. The lower cover plate has a rack with a second ratchet tooth that engages with the first ratchet tooth. When the rack passes through the through hole, the upper and lower cover plates can move closer together. Simultaneously, the engaging action of the first and second ratchet teeth allows the upper and lower cover plates to clamp autologous skull fragments and free bone flaps or repair materials between them, thus achieving a fixation effect.

[0004] However, in actual surgery, the thickness of the artificial skull prosthesis (repair material) differs from the bone thickness at the edge of the patient's skull defect, resulting in a thickness discrepancy. When the upper and lower cover plates are tightened under force, the lower cover plate near the dura mater may tilt, causing local stress concentration and failure, or the gap between the lower cover plate and the skull bone may become too large, causing the cover plate to slip and making it difficult to fit tightly. All of these failures will affect the safety and effectiveness of long-term skull fixation. Summary of the Invention

[0005] This application provides an adjustable skull lock, which can effectively solve the problem that the thickness difference between the skull prosthesis and the patient's own skull during installation can easily cause skull fixation failure.

[0006] The above-mentioned objective of this application is achieved through the following technical solution:

[0007] An adjustable skull lock includes an upper cover plate with a through hole. A column is inserted into the through hole and the two are connected by a first locking assembly. The first locking assembly can restrict the column when it moves downward.

[0008] A mounting groove is provided on one side of the upper end of the column, and the upper end of the mounting groove is fixed on the upper cover plate; a lower cover plate is provided on the lower side of the opposite side of the column and the two are fixedly connected.

[0009] An insert block is inserted into the mounting groove and the two are connected by a second locking component. The second locking component can restrict the insert block when it moves downward. The lower end of the insert block is fixedly connected to the toothed plate of the upper cover.

[0010] Furthermore, there are two through holes, and the two through holes are symmetrical about their center point on the upper cover plate.

[0011] Furthermore, the first locking assembly includes two first helical racks and a W-shaped locking block. The two first helical racks are respectively embedded in the mutually close sides of the two columns, and the teeth on the first helical racks are inclined downward.

[0012] The W-shaped snap-fit ​​block is located between the two first oblique toothed racks, and the upper side of the middle position of the W-shaped snap-fit ​​block is fixedly connected to the lower side of the center position of the upper cover plate.

[0013] The upper ends of the two outermost inclined segments of the W-shaped snap-fit ​​block are respectively located in the two through holes. Each of the two outermost inclined segments of the W-shaped snap-fit ​​block is provided with a second helical rack on the mutually distant side, and the two second helical racks respectively mesh with the two first helical racks.

[0014] Furthermore, the second locking assembly includes two third helical racks and two ratchet teeth. The two third helical racks are symmetrically installed on opposite sides of the insert block along its length, and the teeth of the third helical racks are inclined downwards. The two ratchet teeth are fixed on opposite sidewalls of the mounting groove along its length, and the two ratchet teeth respectively mesh with the two third helical racks.

[0015] Furthermore, the upper cover plate has a circular structure, while the lower cover plate and the upper cover toothed plate both have an arc-shaped structure.

[0016] Furthermore, a booster block is provided above the upper cover plate, two columns pass through the booster block, and both columns are slidably connected to the booster block in the vertical direction; a pull ring is provided above the booster block, and the upper ends of the two columns are fixedly connected to the pull ring after passing through the booster block.

[0017] Furthermore, the upper cover has a downward-curved structure at its edge, and the upper cover toothed piece and the lower cover have upward-curved structures at their arc-shaped edges. The ends of the curved portions of the upper cover, the upper cover toothed piece, and the lower cover are all uniformly provided with edge teeth in the circumferential direction.

[0018] Furthermore, the lower cover plate is provided with reinforcing ribs.

[0019] Furthermore, the upper cover, the upper cover toothed plate, and the lower cover are all made of implantable medical polymer materials, and the push block and the pull ring are made of medical metal that can be sterilized.

[0020] Furthermore, the upper cover sheet, the upper cover toothed sheet, and the lower cover sheet are made of polyetheretherketone or polyetherketoneketone.

[0021] In summary, this application includes at least one of the following beneficial technical effects:

[0022] 1. The upper cover toothed plate of this application can change the distance between the upper cover toothed plate and the upper cover plate by controlling the depth of its upper insert block inserted into the installation groove to adapt to the thickness of the artificial skull prosthesis. After the upper cover toothed plate is adjusted to match the upper cover plate and clamps the artificial skull prosthesis, the second locking component can act on the upper cover toothed plate and the upper cover plate to maintain the fixation effect on the artificial skull prosthesis.

[0023] 2. The lower cover plate of this application can be adjusted by controlling the distance between the upper and lower cover plates through the through hole in the upper cover plate, thereby adapting to the thickness of the patient's own skull at the site of skull fracture. Once the adjustment between the upper and lower cover plates meets the patient's skull thickness, the first locking component can fix the rectangle between the upper and lower cover plates, thus securing them to the patient's own skull. In this way, the skull lock of this application can simultaneously fix artificial skull prostheses of different thicknesses and the patient's native skull using the upper cover plate, lower cover plate, and upper cover toothed plate. This effectively solves the problem of fixation failure that easily occurs when fixing artificial skull prostheses of different thicknesses and the patient's native skull in existing skull locks. It ensures the safety and effectiveness of long-term skull fixation.

[0024] 3. The upper cover and lower cover of this application are connected by two pillars, which can further improve the connection strength between them after the first locking assembly locks them together and reduces the risk of separation between the upper cover and lower cover. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the overall structure of this application;

[0027] Figure 2 This is a side view of this application;

[0028] Figure 3 This is a schematic diagram of the structure of the W-shaped locking block locking the column in this application;

[0029] Figure 4 This is a bottom view of the top cover of this application;

[0030] Figure 5 This is a side view of the top cover of this application;

[0031] Figure 6 This is a schematic diagram of the structure of the upper cover toothed piece and the upper cover piece after disassembly in this application;

[0032] Figure 7 This is a schematic diagram of the internal structure of the mounting groove after the insert of the toothed plate of the upper cover is inserted into the mounting groove of the upper cover plate;

[0033] Figure 8 This is a schematic diagram of the booster block of this application.

[0034] Reference numerals: 1. Upper cover plate; 2. Through hole; 3. Post; 4. First locking assembly; 41. First oblique rack; 42. W-shaped snap-fit ​​block; 43. Second oblique rack; 5. Mounting groove; 6. Lower cover plate; 7. Insert block; 8. Second locking assembly; 81. Third oblique rack; 82. Ratchet; 9. Upper cover toothed plate; 10. Push block; 11. Pull ring; 12. Edge tooth; 13. Reinforcing rib. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions in the embodiments of this application are described clearly and completely below. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are also within the scope of protection of this application.

[0036] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application 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 application.

[0037] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0038] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly, for example, they can refer to a fixed connection, a detachable connection, or an integral connection. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0039] like Figure 1 , Figure 2 , Figure 3 and Figure 7 As shown, an adjustable skull lock disclosed in this application includes an upper cover plate 1 with a through hole 2. A column 3 is inserted into the through hole 2 and the two are connected by a first locking assembly 4. The first locking assembly 4 can restrict the column 3 when it moves downward. A mounting groove 5 is provided on one side of the upper end of the column 3, and the upper end of the mounting groove 5 is fixed on the upper cover plate 1. A lower cover plate 6 is provided on the lower side of the opposite side of the column 3 and the two are fixedly connected.

[0040] The mounting groove 5 is fitted with a plug 7 and the two are connected by a second locking component 8. The second locking component 8 can restrict the plug 7 when it moves downward. The lower end of the plug 7 is fixedly connected to the upper cover toothed plate 9.

[0041] In the above embodiments, the column 3 of this application is vertically disposed on the lower cover plate 6 and the two are fixedly connected. The upper cover plate 1 is provided with a through hole 2 for the column 3 to pass through. When the distance between the upper cover plate 1 and the lower cover plate 6 changes, the length of the part of the column 3 connected to the lower cover plate 6 that passes through the through hole 2 will also change accordingly. Similarly, the doctor can also change the length of the part of the column 3 that passes through the through hole 2 by lifting the column 3 above the upper cover plate 1, thereby changing the distance between the upper cover plate 1 and the lower cover plate 6. Since the first locking component 4 limits the movement of the column 3 downward from the through hole 2, after the upper cover 1 and the lower cover 6 clamp the patient's skull, the patient's skull will restrict the upper cover 1 and the lower cover 6 so that they will no longer move closer to each other. When the doctor stops applying force to the upper cover 1 and the lower cover 6, the first locking component 4 will act on the column 3 so that the upper cover 1 and the lower cover 6 will not move away from each other, thus keeping the upper cover 1 and the lower cover 6 clamped to the patient's skull.

[0042] In this application, the upper cover toothed plate 9 and the lower cover plate 6 are located on opposite sides of the column 3. This ensures that when the lower cover plate 6 is used to fix the patient's skull with the upper cover plate 1, it does not affect the upper cover toothed plate 9's ability to fix the artificial skull prosthesis on the other side. The upper cover toothed plate 9 and the lower cover plate 6 are two independent structures, allowing them to move independently. The insert 7, connected to the upper cover toothed plate 9, is inserted into the mounting groove 5. The second locking assembly 8, which connects the insert 7 to the mounting groove 5, restricts the movement direction of the insert 7, causing it to move towards the upper cover plate 1. This effect is similar to that of the first locking assembly 4. Therefore, the upper cover plate 1 and the lower cover plate 6, and the upper cover plate 1 and the upper cover toothed plate 9, maintain maximum spacing before use. After the doctor places the artificial skull prosthesis between the upper cover plate 9 and the upper cover plate 1, the upper cover plate 1 and the upper cover plate 9 can be pressed at the same time. The insert 7 will move towards the upper cover plate 1 in the mounting groove 5, and the distance between the upper cover plate 1 and the upper cover plate 9 will become smaller. After the upper cover plate 1 and the upper cover plate 9 clamp the artificial skull prosthesis, under the action of the second locking component 8, the two will maintain the fixed state of the artificial skull prosthesis for a long time.

[0043] In use, the cranial lock of this application is fixed to the patient's own skull by the upper cover plate 1 and the lower cover plate 6, and the artificial skull prosthesis is clamped by the upper cover tooth plate 9 and the upper cover plate 1. Compared with the existing cranial lock, which uses the upper cover plate 1 and the lower cover plate 6 to fix the patient's skull and artificial skull prosthesis of different thicknesses at the same time, this application effectively solves the problem that the thickness of the free bone flap or artificial skull prosthesis that needs to be fixed in clinical practice is inconsistent with the thickness of the patient's skull. In the later stage, the lower cover plate 6 is prone to slippage and failure due to excessive gap between the lower cover plate 6 and the skull bone.

[0044] Furthermore, such as Figure 4 and Figure 5 As shown, there are two through holes 2, and the two through holes 2 are symmetrical about their center point on the upper cover plate 1.

[0045] In the above embodiments, there are two through holes 2 and two corresponding columns 3. The first locking component 4 can simultaneously limit the two columns 3, so the connection strength between the upper cover 1 and the lower cover 6 will not only be further improved, but the risk of the upper cover 1 and the lower cover 6 falling off during use will also be further reduced.

[0046] Furthermore, such as Figure 1 , Figure 3 , Figure 4 and Figure 5 As shown, the first locking assembly 4 includes two first helical racks 41 and a W-shaped locking block 42. The two first helical racks 41 are respectively embedded in the mutually close sides of the two columns 3, and the teeth on the first helical racks 41 are inclined downward.

[0047] The W-shaped snap-fit ​​block 42 is located between the two first oblique racks 41, and the upper side of the middle position of the W-shaped snap-fit ​​block 42 is fixedly connected to the lower side of the center position of the upper cover plate 1.

[0048] The upper ends of the two outermost inclined sections of the W-shaped snap-fit ​​block 42 are located in the two through holes 2 respectively. A second helical rack 43 is provided on the mutually distant side of the two outermost inclined sections of the W-shaped snap-fit ​​block 42. The two second helical racks 43 mesh with the two first helical racks 41 respectively.

[0049] In the above embodiments, the two inclined sections on both sides of the W-shaped snap-fit ​​block 42 have a certain elasticity. When the column 3 moves along the through hole 2, the first inclined rack 41 on the column 3 will squeeze the second inclined rack 43 on the corresponding inclined section of the W-shaped snap-fit ​​block 42. The elastic force generated by the deformation of the inclined end of the W-shaped snap-fit ​​block 42 can make the second inclined rack 43 and the first inclined rack 41 snap together.

[0050] Since the teeth of the first helical rack 41 are inclined downwards, and the teeth of the second helical rack 43 that can mesh with it are inclined upwards, the teeth of the first helical rack 41 can smoothly pass through the teeth of the second helical rack 43 as the column 3 moves upwards. However, when the column 3 tends to move downwards, the teeth of the second helical rack will obstruct the teeth of the first helical rack 41, thereby restricting the column 3 from moving away from the upper cover plate 1.

[0051] The two first oblique racks 41 and the two second oblique racks 43 are symmetrical about the center line of the W-shaped locking block 42. The working principle of the two first oblique racks 41 and the corresponding second oblique racks 43 is the same. When the upper cover 1 and the lower cover 6 clamp the patient's skull, the two second oblique racks 43 on the W-shaped locking block 42 can automatically lock the first oblique racks 41 on the two columns 3 at the same time, which improves the fixation effect and fixation efficiency of the upper cover 1 and the lower cover 6 on the patient's skull.

[0052] Each of the two columns 3 has a groove along the vertical direction on the side closest to each other. Two first oblique racks 41 are respectively installed in the grooves on the two columns 3. The teeth of the two first oblique racks 41 face the W-shaped snap block 42, and their tooth ends are flush with the side wall of the corresponding column 3. This not only saves space effectively, but also prevents the first oblique racks 41 from getting caught on the flesh of the patient's wound when the column 3 moves.

[0053] In normal conditions, the second helical racks 43 on the two inclined end sections on both sides of the W-shaped locking block 42 are both in a vertical state, so they are parallel to the first helical rack 41, which is also in a vertical state. In this way, the teeth on the second helical rack 43 can contact the teeth on the first helical rack 41, thereby improving the restriction effect on the first helical rack 41 in the future.

[0054] The top of the middle part of the W-shaped snap-fit ​​block 42 is horizontal, which increases the fixed connection area between it and the upper cover plate 1, thereby improving its stability during use.

[0055] When the first helical rack 41 and the second helical rack 43 are stationary, the sum of the thicknesses of the column 3 and the inclined section of the W-shaped locking block 42 is less than the diameter of the through hole 2 on the upper cover plate 1. This ensures that the column 3 can pass smoothly through the through hole 2 on the upper cover plate 1, and that the inclined section of the W-shaped locking block 42 can smoothly extend into the through hole 2. Furthermore, during the movement of the column 3, there is a certain space in the through hole 2 for the inclined section of the W-shaped locking block 42 to deform.

[0056] The inclined section of the W-shaped snap-fit ​​block 42 of this application extends into the through hole 2 of the upper cover plate 1. This makes the overall structure of the equipment more compact. On the other hand, when the inclined section of the W-shaped snap-fit ​​block 42 is deformed by compression, the side wall of the through hole 2 can limit the inclined section of the W-shaped snap-fit ​​block 42 to a certain extent, so as to avoid its deformation range being too large and affecting the use effect.

[0057] Furthermore, such as Figure 2 , Figure 6 and Figure 7 As shown, the second locking assembly 8 includes two third helical racks 81 and two ratchet teeth 82. The two third helical racks 81 are symmetrically installed on opposite sides of the insertion block 7 along its length, and the teeth of the third helical racks 81 are inclined downwards. The two ratchet teeth 82 are fixed on opposite sidewalls of the mounting groove 5 along its length, and the two ratchet teeth 82 mesh with the two third helical racks 81 respectively.

[0058] In the above embodiments, the ratchet 82 of this application is a single tooth with the opposite tooth direction to the third helical tooth, and its function is similar to the pawl in a ratchet mechanism. The teeth of the two third helical racks 81 on the insert block 7 are both facing the inner wall of the mounting groove 5 on the corresponding side, and mesh with the ratchet 82 on the inner wall of the mounting groove 5 on the corresponding side. Because the teeth of the two third oblique racks 81 are inclined downwards, when the upper cover plate 9 moves with the insert block 7 into the mounting groove 5 on the upper cover plate 1, the third oblique racks 81 on both sides of the insert block 7 will squeeze the two ratchet teeth 82 outwards. When the distance between the upper cover plate 9 and the upper cover plate 1 is equal to the thickness of the artificial skull prosthesis, the squeezing force applied to the upper cover plate 9 and the upper cover plate 1 stops. At this time, the two ratchet teeth 82 will rotate around their connection point with the mounting groove 5 under the action of elasticity, and reset to mesh with the corresponding third oblique racks 81. In this way, when the upper cover plate 9 and the upper cover plate 1 tend to move away from each other, the ratchet teeth 82 will generate resistance to the third oblique racks 81, making it difficult for the third oblique racks 81 that have entered the mounting groove 5 to go out again, thereby ensuring the fixation effect of the upper cover plate 9 and the upper cover plate 1 on the artificial skull prosthesis.

[0059] Furthermore, such as Figure 2 and Figure 4 As shown, the upper cover 1 has a circular structure, while the lower cover 6 and the upper cover toothed piece 9 both have an arc-shaped structure.

[0060] In the above embodiments, the bow shape is a figure composed of a chord and its corresponding arc. The lower cover plate 6 and the upper cover toothed plate 9 of this application are both semi-circular bows within the bow-shaped structure, thus each has an arc-shaped side and a straight side. The straight side of the lower cover plate 6 and the straight side of the upper cover toothed plate 9 both face the column 3. This ensures a larger contact area between the area of ​​the upper cover toothed plate 9 near the edge of the artificial skull prosthesis and the artificial skull prosthesis. Similarly, the contact area between the lower cover plate 6 and the edge of the patient's skull damage area is also larger. In practical applications, the circular structure of the upper cover plate 1 can fit against the outside of the skull prosthesis and be close to the patient's scalp soft tissue. When fixing the skull prosthesis to the patient's own skull, the upper cover plate 1, in conjunction with the semi-circular upper cover toothed plate 9 and the lower cover plate 6, can effectively improve the stability of the skull prosthesis after installation.

[0061] Furthermore, such as Figure 1 , Figure 2 and Figure 8 As shown, a booster block 10 is provided above the upper cover 1, and two columns 3 pass through the booster block 10. Both columns 3 and the booster block 10 are slidably connected in the vertical direction. A pull ring 11 is provided above the booster block 10. The upper ends of the two columns 3 pass through the booster block 10 and are fixedly connected to the pull ring 11.

[0062] In the above embodiments, the upper end of the column 3 and the pull ring 11 are detachably fixed. For example, the upper end of the column 3 can be fixed to the pull ring 11 with bolts. After the pull ring 11 is used, the detachable bolts can release the restriction on the column 3, and the column 3 can be removed from the pull ring 11 for multiple uses.

[0063] The upper end of the column 3 passes through the push block 10 and is connected to the pull ring 11. When the doctor needs to tighten the upper cover plate 1 and the lower cover plate 6 to fix them to the patient's skull, the doctor can press the push block 10 with his hand and pull the pull ring 11 upward. The pull ring 11 can move the lower cover plate 6 upward through the column 3 connected to it. After the lower cover plate 6 and the upper cover plate 1 are locked on the patient's skull, the medical staff cut off the excess column 3, remove the push block 10 and the pull ring 11. The cut of the column 3 is flush with the through hole 2 on the upper cover plate 1, without protrusion, to ensure aesthetic requirements. The upper handle of the pusher block 10 has a larger area than the upper cover plate 1, and it is positioned at a certain height above the patient's skull. This allows medical staff to apply force to the upper cover plate 1, ensuring it remains in close contact with the patient's skull and skull prosthesis as the lower cover plate 6 moves. The pull ring 11 allows workers to simultaneously apply force to both pillars 3, quickly bringing the lower cover plate 6 into close contact with the dura mater on the inside of the patient's skull. This design makes the procedure simple, quick, and time-saving for doctors.

[0064] Furthermore, such as Figure 2 As shown, the upper cover 1 has a downward-curved structure at its edge, while the upper cover tooth 9 and the lower cover 6 both have an upward-curved structure at their arc-shaped edges.

[0065] In the above embodiments, the upper cover plate 1, configured as described above, reduces the gap between the upper cover plate 1 and the patient's own skull and the skull prosthesis after the skull prosthesis is fixed, ensuring the aesthetic appearance of the patient's head after healing. The upper cover plate 9 and the lower cover plate 6, while configured as described above, have rounded corners on their warped portions, which reduces damage to the patient's skull dura mater.

[0066] Furthermore, such as Figure 2 and Figure 4 As shown, the warped ends of the upper cover plate 1, the upper cover toothed plate 9, and the lower cover plate 6 are all uniformly provided with edge teeth 12 in the circumferential direction.

[0067] In the above embodiments, the upper cover 1, upper cover toothed plate 9, and lower cover 6 are arranged as described above. In clinical use, this reduces the limitations imposed by the patient's own skull fracture site and the actual mating surface of the skull prosthesis. The shape of a patient's skull is not a regular structure; when different areas of the skull are fractured, the edge shape of the fractured area will be different. The upper cover 1, upper cover toothed plate 9, and lower cover 6 of this application have edge teeth 12, which allows them to achieve a close fit with the skull surface together with the skull prosthesis when facing different fractured areas of the patient's skull. Furthermore, these edge teeth 12 on the upper cover 1, upper cover toothed plate 9, and lower cover 6 are distributed in a regular pattern of varying lengths along their circumference. This further enhances the adaptability of the upper cover 1, upper cover toothed plate 9, and lower cover 6 to different fractured areas of the patient's skull and also increases the frictional force when fitting with the patient's own skull and the skull prosthesis.

[0068] Furthermore, such as Figure 1 As shown, the lower cover plate 6 is provided with reinforcing ribs 13.

[0069] In the above embodiments, the reinforcing ribs 13 designed on the lower cover plate 6 not only increase the strength of the lower cover plate 6, but also improve the friction when the lower cover plate 6 contacts the patient's own skull.

[0070] Furthermore, the upper cover 1, the upper cover toothed plate 9, and the lower cover 6 are all made of implantable medical polymer materials, while the push block 10 and the pull ring 11 are made of medical metal that can be sterilized.

[0071] In the above embodiments, the cranial locking devices used clinically for skull fixation mainly include titanium cranial locking devices and polymer cranial locking devices. Titanium cranial locking devices are made of metal, which can cause artifacts in subsequent CT and MRI imaging examinations. Therefore, the upper cover 1, lower cover 6, and upper cover toothed plate 9, as well as other accessories fixedly connected to them, are all made of implantable medical-grade polymer materials. Suitable medical-grade polymer materials include polyetheretherketone (PEEK), polyetherketoneketone (PEKK), polymethyl methacrylate, polylactic acid, and polyethylene. The push block 10 and pull ring 11 are made of medical-grade metal, which allows for effective sterilization after use and improves utilization. The medical-grade metal can be 316 stainless steel.

[0072] Furthermore, the upper cover 1, the upper cover toothed piece 9, and the lower cover 6 are made of polyetheretherketone (PEEK) or polyetherketoneketone (PEKK).

[0073] In the above embodiments, both polyetheretherketone (PEEK) and polyetherketoneketone (PEKK) exhibit good creep resistance and hydrolysis resistance, and are non-toxic, lightweight, and corrosion-resistant. They are materials most similar to human bone, therefore PEEK can be used to replace metal in the manufacture of human bones. Thus, PEEK or PEKK can be used to make the upper cover plate 9, the upper cover plate 1, and the lower cover plate 6, as well as the structural attachments that need to be implanted into the patient's head together.

[0074] The implementation principle of this embodiment is as follows: In clinical practice, when repairing skull defects, multiple cranial locks are usually used to fix the artificial skull prosthesis to the defect area. Specifically, the doctor first places the artificial skull prosthesis between the upper cover plate 9 and the upper cover plate 1 of one of the cranial locks. Then, the doctor simultaneously squeezes the upper cover plate 1 and the upper cover plate 9 until they clamp the artificial skull prosthesis. After releasing the hand, the ratchet 82 in the mounting groove 5 automatically locks the third oblique rack 81 on the insert 7 connected to the upper cover plate 9. The remaining cranial locks are then evenly fixed to the edges of the artificial skull prosthesis in the same manner. Then, the lower cover plate 6 of the cranial lock and the artificial skull prosthesis are placed at the skull defect. Because the column 3 is made of medical-grade polymer material and has a certain degree of flexibility, the column 3 can be bent during placement to facilitate the lower cover plate 6 entering the skull defect. After placing the artificial skull prosthesis at the patient's skull defect, the doctor can press down on the pusher block 10 with one hand and pull the column 3 through the pull ring 11 with the other. The column 3 can bring the lower cover plate 6 closer to the upper cover plate 1. After the lower cover plate 6 and the upper cover plate 1 clamp the patient's skull, releasing the W-shaped locking block 42 below the upper cover plate 1 through the pull ring 11 will lock the two columns 3. The operation method of all skull locks is roughly the same and will not be described in detail here. Next, the doctor will cut off the excess columns 3 on the outside of each upper cover plate 1 in turn, and remove the excess columns 3, pusher blocks 10 and pull rings 11 together.

[0075] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. An adjustable skull lock, comprising an upper cover (1), characterized in that: The upper cover (1) is provided with a through hole (2), and a column (3) is inserted into the through hole (2) and the two are connected by a first locking component (4). The first locking component (4) can restrict the column (3) when it moves downward. The column (3) has an installation groove (5) on one side of its upper end, and the upper end of the installation groove (5) is fixed on the upper cover plate (1); the column (3) has a lower cover plate (6) on the other opposite side below, and the two are fixedly connected. The mounting groove (5) is provided with a plug (7) and the two are connected by a second locking component (8). The second locking component (8) can restrict the plug (7) when it moves downward. The lower end of the plug (7) is fixedly connected to the upper cover toothed plate (9). The number of the through holes (2) is two, and the two through holes (2) are symmetrical about their center point on the upper cover plate (1). The first locking assembly (4) includes two first helical racks (41) and a W-shaped snap block (42). The two first helical racks (41) are respectively embedded on the mutually close sides of the two columns (3), and the teeth on the first helical racks (41) are inclined downward. The W-shaped snap-fit ​​block (42) is located between the two first oblique racks (41), and the upper side of the middle position of the W-shaped snap-fit ​​block (42) is fixedly connected to the lower side of the center position of the upper cover plate (1). The upper ends of the two outermost inclined sections of the W-shaped snap-fit ​​block (42) are respectively located in the two through holes (2). A second helical rack (43) is provided on the mutually distant side of the two outermost inclined sections of the W-shaped snap-fit ​​block (42). The two second helical racks (43) mesh with the two first helical racks (41) respectively. The second locking assembly (8) includes two third helical racks (81) and two ratchet teeth (82). The two third helical racks (81) are respectively symmetrically installed on opposite sides of the insert block (7) along its length, and the teeth of the third helical racks (81) are inclined downward. The two ratchet teeth (82) are respectively fixed on opposite sidewalls of the mounting groove (5) along its length, and the two ratchet teeth (82) respectively mesh with the two third helical racks (81).

2. The adjustable cranial lock according to claim 1, characterized in that: The upper cover (1) has a circular structure, while the lower cover (6) and the upper cover toothed piece (9) both have an arc-shaped structure.

3. The adjustable cranial lock according to claim 1 or 2, characterized in that: A booster block (10) is provided above the upper cover plate (1), and two columns (3) pass through the booster block (10). Both columns (3) and the booster block (10) are slidably connected in the vertical direction. A pull ring (11) is provided above the booster block (10). The upper ends of the two columns (3) pass through the booster block (10) and are fixedly connected to the pull ring (11).

4. The adjustable cranial lock according to claim 1 or 2, characterized in that: The upper cover (1) has a downward-curved structure at its edge, and the upper cover toothed piece (9) and the lower cover (6) both have an upward-curved structure at their arc-shaped edges. The ends of the curved portions of the upper cover (1), the upper cover toothed piece (9) and the lower cover (6) are all uniformly provided with edge teeth (12) in the circumferential direction.

5. The adjustable cranial lock according to claim 1 or 2, characterized in that: The lower cover plate (6) is provided with reinforcing ribs (13).

6. The adjustable cranial lock according to claim 3, characterized in that: The upper cover (1), the upper cover toothed plate (9) and the lower cover (6) are all made of implantable medical polymer materials, and the pusher block (10) and the pull ring (11) are made of medical metal that can be sterilized.

7. The adjustable cranial lock according to claim 6, characterized in that: The upper cover (1), the upper cover toothed plate (9), and the lower cover (6) are made of polyetheretherketone or polyetherketoneketone.

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