Volume expansion assembly for reconstitution of the cisterna magna

Abstract

The application relates to the technical field of medical devices, and particularly discloses an expansion assembly for occipitoatlantoesthesis reconstruction, which comprises a plate body, one side of the plate body is provided with a groove, the plate body is provided with a plurality of first connecting parts, the first connecting parts are located on the outer periphery of the groove and are arranged at intervals, and the first connecting parts are used for being connected with the occipital bone and / or the atlas; the plate body is provided with at least one second connecting part, the second connecting part is arranged on the groove bottom, and the second connecting part is used for fixing the meninges. The above-mentioned arrangement is helpful for relieving the compression of the brain tissue and restoring the circulation of the cerebrospinal fluid. Since the plate body has the supporting capacity, when the intracranial pressure increases, the plate body will not be deformed, a relatively stable support is formed on the meninges, the probability of cracks at the suture of the meninges is reduced, the probability of the overflow of the cerebrospinal fluid and the meningeal outpouching is reduced, the recovery speed of the operation is improved, the scar adhesion is reduced, the circulation of the cerebrospinal fluid is smooth, and the probability of the secondary operation is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of medical devices, in particular to an expansion assembly for occipital cistern reconstruction. BACKGROUND

[0002] Cerebellar tonsil hernia is a rare congenital brain development deformity, which is characterized by reduced posterior fossa volume and cerebellar tonsil entering the spinal canal. Depending on the condition, conservative treatment or surgical treatment can be chosen. The purpose of surgery is to expand the posterior fossa volume, relieve brain tissue compression, and restore cerebrospinal fluid circulation.

[0003] The existing treatment method cuts a gap at the occipital bone, then cuts the dura mater and sutures after processing, and finally covers the gap with a flexible sheet. The flexible sheet has elasticity and helps to adaptively expand the posterior fossa volume to adapt to different patient conditions. However, when intracranial pressure increases, the dura mater suture site will crack, causing cerebrospinal fluid to leak out; in addition, it is also easy to form scar adhesion, leading to recurrence of cerebrospinal fluid circulation disorder, requiring secondary surgery.

[0004] Therefore, an expansion assembly for occipital cistern reconstruction is further researched to solve the above problems. SUMMARY

[0005] The purpose of the present application is to provide an expansion assembly for occipital cistern reconstruction to solve the problem of cerebrospinal fluid leakage in the prior art.

[0006] To achieve the above purpose, the following technical solutions are adopted:

[0007] The expansion assembly for occipital cistern reconstruction comprises a plate body, one side of the plate body is provided with a groove, the plate body is provided with a plurality of first connecting parts, the plurality of first connecting parts are located on the outer periphery of the groove and are arranged at intervals, and the first connecting parts are used to connect with the occipital bone and / or atlas.

[0008] The plate body is provided with at least one second connecting part, the second connecting part is arranged on the groove bottom, and the second connecting part is used to fix the dura mater.

[0009] As an optional technical solution of the expansion assembly for occipital cistern reconstruction, the second connecting part is a fixing hole penetrating through the plate body, and the expansion assembly for occipital cistern reconstruction further comprises a fixing part, and the dura mater and the plate body are connected through the fixing part.

[0010] As an optional technical solution of the expansion assembly for occipital cistern reconstruction, the fixing part is a fixing rope, the fixing rope can pass through the fixing hole and be fixed with the plate body, and is used to connect the dura mater; wherein the diameter of the fixing rope is smaller than the diameter of the fixing hole.

[0011] As an optional technical scheme of the expansion assembly for the reconstruction of the cisterna magna, the plate body is penetrated by a plurality of fixing holes, and the plurality of fixing holes are dispersedly arranged.

[0012] As an optional technical scheme of the expansion assembly for the reconstruction of the cisterna magna, the first connecting part is a mounting hole penetrating the plate body, and the expansion assembly for the reconstruction of the cisterna magna further comprises a mounting screw, the mounting screw penetrating the mounting hole and being screwed to the occipital bone and / or the atlas.

[0013] As an optional technical scheme of the expansion assembly for the reconstruction of the cisterna magna, the mounting hole comprises at least two first mounting holes, the two first mounting holes are located at the upper part of the plate body and are separately arranged on the left and right sides of the groove, and the two mounting screws penetrate the corresponding first mounting holes and are screwed to the occipital bone, respectively.

[0014] The mounting hole comprises at least two second mounting holes, the two second mounting holes are located at the lower part of the plate body and are separately arranged on the left and right sides of the groove, and the two mounting screws penetrate the corresponding second mounting holes and are screwed to the atlas, respectively.

[0015] As an optional technical scheme of the expansion assembly for the reconstruction of the cisterna magna, the shape of one side of the plate body with the groove at the first mounting hole is adapted to the shape of the occipital bone.

[0016] The shape of one side of the plate body with the groove at the second mounting hole is adapted to the shape of the atlas.

[0017] As an optional technical scheme of the expansion assembly for the reconstruction of the cisterna magna, one side of the plate body with the groove is a smooth curved surface structure as a whole, and the groove and the plate body are smoothly transitioned at the first connecting part.

[0018] As an optional technical scheme of the expansion assembly for the reconstruction of the cisterna magna, the groove is an arc-shaped groove, and the arc height of the arc-shaped groove ranges from 5mm to 15mm.

[0019] As an optional technical scheme of the expansion assembly for the reconstruction of the cisterna magna, one side of the plate body away from the groove is a smooth curved surface structure as a whole.

[0020] The present application has at least the following beneficial effects:

[0021] The application provides an expansion assembly for reestablishing the cisterna magna, which comprises a plate body, one side of the plate body is provided with a groove, the plate body is provided with a plurality of first connecting parts, the plurality of first connecting parts are located at the outer periphery of the groove and are arranged at intervals, and the first connecting parts are used for connecting with the occipital bone and / or atlas; the plate body is provided with at least one second connecting part, the second connecting part is arranged on the groove bottom, and the second connecting part is used for fixing the dura mater.

[0022] In use, part of the occipital bone of the patient is first incised to form a gap, then the dura mater is incised and sutured after the treatment is completed, and finally, the plate body is sealed at the gap, the first connecting part is connected to the head of the patient, and the opening of the groove is communicated with the gap to increase the capacity of the posterior cranial fossa, which helps to relieve the compression of the brain tissue and restore the circulation of the cerebrospinal fluid. Since the plate body has a large supporting capacity, it will not deform when the intracranial pressure increases, and a relatively stable support is formed on the dura mater, thereby reducing the probability of cracks at the sutured dura mater, further reducing the possibility of cerebrospinal fluid leakage, improving the speed of postoperative recovery, reducing the occurrence of scar adhesion, and helping the smooth circulation of cerebrospinal fluid and reducing the probability of secondary surgery.

[0023] In addition, due to the arrangement of the second connecting part, the dura mater can be fixed, thereby further improving the stability of the dura mater, reducing the possibility of deformation of the dura mater when the intracranial pressure increases, ensuring the safety of the sutured dura mater, and further reducing the probability of cerebrospinal fluid leakage caused by cracks. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the application, the drawings needed in the description of the embodiments of the application will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of the contents of the embodiments of the application and the drawings.

[0025] Figure 1 FIG. 1 is a structural schematic view of the expansion assembly for reestablishing the cisterna magna in the embodiments of the application;

[0026] Figure 2 FIG. 2 is a structural schematic view of the gap cut in the skull of the patient;

[0027] Figure 3 FIG. 3 is a structural schematic view of the expansion assembly for reestablishing the cisterna magna in the embodiments of the application sealing the gap;

[0028] Figure 4 FIG. 4 is a structural schematic view of the expansion assembly for reestablishing the cisterna magna in the embodiments of the application; Figure 3 FIG. 5 is a sectional view in the medium pressure A-A direction.

[0029] In the drawings:

[0030] 1000, Cervical vertebra; 1100, Notch; 2000, Atlas;

[0031] 100, Plate body; 110, Groove; 120, First connecting part; 121, First mounting hole; 122, Second mounting hole; 130, Second connecting part;

[0032] 200, Mounting screw. DETAILED DESCRIPTION

[0033] Before any embodiments of the application are explained in detail, it is to be understood that the application is not limited in its application to the details of construction and the arrangement of components set forth in the following description or illustrated in the above-described accompanying drawings.

[0034] In this application, the terms "comprise", "contain", "have" or any other variant thereof are intended to cover non-exclusive inclusions, so that a process, method, article or device that includes a series of elements not only includes those elements, but also includes other elements not explicitly listed, or further includes elements inherent to such a process, method, article or device. Without more limitations, the element defined by the statement "comprises a" does not exclude the presence of other identical elements in the process, method, article or device that includes the element.

[0035] In this application, the term "and / or", is a description of the association relationship between the associated objects, which means that there can be three kinds of relationships. For example, A and / or B can represent three cases: A exists alone, A and B exist together, and B exists alone. In addition, the character " / " in this application generally represents that the front and rear associated objects are in a "and / or" relationship.

[0036] In this application, the terms "connection", "combination", "coupling", "mounting" can be direct connection, combination, coupling or mounting, or indirect connection, combination, coupling or mounting. Among them, for example, direct connection refers to the connection of two parts or components without the need for an intermediate part, and indirect connection refers to the connection of two parts or components with at least one intermediate part. The two parts or components are connected through the intermediate part. In addition, "connection" and "coupling" are not limited to physical or mechanical connection or coupling, and can include electrical connection or coupling.

[0037] In this application, those of ordinary skill in the art will understand that the relative terms used in connection with a quantity or a condition (for example, "about", "approximately", "substantially" and the like) include the stated value and have the meaning indicated by the context. For example, the relative terms at least include the degree of error related to the measurement of a specific value, the tolerance caused by manufacturing, assembly, use, and the like related to a specific value. Such terms should also be considered to disclose the range defined by the absolute values of the two endpoints. The relative terms can refer to the addition or subtraction of a certain percentage (for example, 1%, 5%, 10% or more) of the indicated value. The numerical value without the relative term should also be disclosed as a specific value with a tolerance. In addition, "substantially" when expressing the relative angular positional relationship (for example, substantially parallel, substantially perpendicular), can refer to the addition or subtraction of a certain degree (for example, 1 degree, 5 degrees, 10 degrees or more) based on the indicated angle.

[0038] In this application, those of ordinary skill in the art will understand that the functions performed by the components can be performed by one component, multiple components, one part, or multiple parts. Similarly, the functions performed by the parts can also be performed by one part, one component, or multiple parts in combination.

[0039] In this application, the terms "upper", "lower", "left", "right", "front", "back" and the like are described in the orientation and positional relationship shown in the drawings, and should not be understood as limiting the embodiments of the application. In addition, it should also be understood in the context that when referring to one element connected to another element "on" or "under", it can not only be directly connected to another element "on" or "under", but also indirectly connected to another element "on" or "under" through an intermediate element. It should also be understood that the terms "upper", "lower", "left", "right", "front", "back" and the like not only represent the positive direction, but also can be understood as the side direction. For example, the lower side can include the directly below, the left below, the right below, the front below and the back below, etc.

[0040] As shown in the Figures 1 to 4 The embodiment provides an expansion assembly for reestablishing the cisterna magna, which comprises a plate body 100, one side of the plate body 100 is provided with a groove 110, the plate body 100 is provided with a plurality of first connecting parts 120, the plurality of first connecting parts 120 are located on the outer periphery of the groove 110 and are arranged at intervals, and the first connecting part 120 is used for connecting with the occipital bone 1000 and / or the atlas 2000; the plate body 100 is provided with at least one second connecting part 130, the second connecting part 130 is arranged on the groove bottom of the groove 110, and the second connecting part 130 is used for fixing the meninges.

[0041] In use, the occipital bone 100 of the patient is first cut to form an opening 1100, then the dura mater is cut and sutured after the treatment is completed, and finally, the plate body 100 is sealed at the opening 1100, the first connecting part 120 is connected to the head of the patient, and the opening of the groove 110 communicates with the opening 1100 to increase the volume of the posterior cranial fossa, which helps to relieve the compression of the brain tissue and restore the circulation of the cerebrospinal fluid. Since the plate body 100 has a large supporting capacity, it will not deform when the intracranial pressure increases, and it will form a relatively stable support for the dura mater, thereby reducing the probability of cracks at the sutured dura mater, and further reducing the possibility of cerebrospinal fluid leakage and dural ectasia, and improving the speed of postoperative recovery; reducing the occurrence of scar adhesion, which helps to smooth the circulation of cerebrospinal fluid and reduces the probability of secondary surgery.

[0042] In addition, due to the provision of the second connecting part 130, the dura mater can be fixed, thereby further improving the stability of the dura mater, reducing the possibility of deformation of the dura mater when the intracranial pressure increases, ensuring the safety of the sutured dura mater, and reducing the probability of cerebrospinal fluid leakage caused by cracks.

[0043] In some embodiments, the second connecting part 130 is a fixed hole penetrating through the plate body 100, and the occipital horn reconstruction volume expansion assembly further comprises a fixing member, and the dura mater and the plate body 100 are connected by the fixing member. For example, the fixing member is a fixing rope, which can pass through the fixed hole and be fixed with the plate body 100 and be used for connecting the dura mater; wherein the diameter of the fixing rope is smaller than the diameter of the fixed hole. The dura mater is pulled by the fixing rope, and after passing through the fixed hole, the fixing rope is fixed with the plate body 100, thereby ensuring the relative position of the dura mater and the plate body 100; wherein the diameter of the fixing rope is smaller than the diameter of the fixed hole, so that the tissue fluid on both sides of the plate body 100 can smoothly exchange through the fixed hole, which helps to provide nutrients for the scalp and reduces the possibility of scalp necrosis. The fixing rope can be an absorbable wire such as catgut. Further, the fixing rope is made of water-permeable material. The above material helps to smoothly exchange the tissue fluid on both sides of the plate body 100. In other embodiments, the fixing rope can be a silk thread. In other embodiments, the fixing member can also be a hook, one end of which is fixed to the dura mater, and the other end passes through the fixed hole and hooks on the plate body 100 to ensure the relative position of the dura mater and the plate body 100. Wherein the end of the hook connected to the dura mater is in U-shaped structure or ring structure with an opening, which is used to pass through the dura mater at one point first, and then pass out of the dura mater at another point.

[0044] In order to effectively fix the dura mater, in some embodiments, the plate body 100 is provided with a plurality of fixing holes which are distributed. In one embodiment of the present embodiment, each two fixing holes correspond to one fixing rope. Specifically, one end of the fixing rope is inserted into the plate body 100 through one fixing hole, then inserted into the dura mater, and then taken out from another fixing hole after being taken out from another point of the dura mater. Then, the two ends of the fixing rope can be knotted and fixed. In another embodiment of the present embodiment, all the fixing holes correspond to one fixing rope, and a plurality of passing points are arranged on the dura mater. When in use, one end of the fixing rope is inserted into the plate body 100 through one fixing hole, then inserted into the dura mater from a corresponding passing point, and then taken out from another corresponding fixing hole to the outside of the plate body 100 after being taken out from another passing point of the dura mater. Then, the other end of the fixing rope is inserted into the plate body 100 through another fixing hole, and then taken out from another corresponding fixing hole to the outside of the plate body 100 after being taken out from another corresponding passing point of the dura mater. The above inserting and taking out actions are repeated in turn, and finally the two ends of the fixing rope are knotted on the outside of the plate body 100. The diameter of the fixing hole is 1-4 mm. The above arrangement increases the fixing points of the dura mater, so that the stress of the dura mater is balanced, which is beneficial to ensure that the positions of the dura mater and the plate body 100 are more stable. In addition, since the stress points of the dura mater are increased, the stress of each stress point is reduced, and the safety of the dura mater is improved.

[0045] In some embodiments, the first connecting part 120 is a mounting hole penetrating the plate body 100, and the cranial fossa reconstruction expansion assembly further comprises a mounting screw 200 which penetrates the mounting hole and is screwed to the occipital bone 1000 and / or the atlas 2000. The above arrangement is helpful to ensure the firmness and convenience of the connection between the plate body 100 and the patient. When in use, when the plate body 100 is placed on the periphery of the gap 1100, the mounting screw 200 can be directly screwed to the occipital bone 1000 and / or the atlas 2000 of the patient through the mounting hole.

[0046] Exemplarily, the mounting holes include at least two first mounting holes 121, the two first mounting holes 121 are located at the upper part of the plate body 100 and are separately arranged on the left and right sides of the groove 110; two mounting screws 200 respectively pass through the corresponding first mounting holes 121 and are screwed to the occipital bone 1000. The mounting holes include at least two second mounting holes 122, the two second mounting holes 122 are located at the lower part of the plate body 100 and are separately arranged on the left and right sides of the groove 110, two mounting screws 200 respectively pass through the corresponding second mounting holes 122 and are screwed to the atlas 2000. Through the four fixed modes, the stress of the plate body 100 is uniform, which ensures the reliability of the connection; in addition, the connection of the occipital bone 1000 and the atlas 2000 is realized through the plate body 100 at the cranio-cervical junction, which increases the stability of the cranio-cervical junction. Among them, the mounting screw 200 passes through the first mounting hole 121 and is screwed to the position where the bone mass of the occipital bone 1000 is thicker. The mounting screw 200 passes through the second mounting hole 122 and is screwed to the position where the bone mass of the atlas 2000 is thicker.

[0047] Further, the first mounting hole 121 is a countersunk hole to accommodate the nut of the mounting screw 200, avoiding affecting the scalp. Similarly, the second mounting hole 122 is a countersunk hole. Among them, the diameter of the first mounting hole 121 ranges from 1mm to 4mm. The diameter of the second mounting hole 122 ranges from 1mm to 4mm.

[0048] In other embodiments, the first connecting part 120 can be a fixed groove penetrating the plate body 100 along the left-right direction, and the occipital horn reconstruction volume expansion assembly further includes a fixed sheet, the length of the fixed sheet is greater than the fixed groove, the fixed sheet is installed in the fixed groove, and both ends are screwed to the occipital bone 1000 and / or the atlas 2000 of the patient. The setting of the fixed sheet helps to adapt to more fixed positions on the basis of the unchanged area of the plate body 100, so as to fix the fixed sheet on the occipital bone 1000 and / or the atlas 2000 with greater thickness. The fixed groove is provided with two, and the two fixed grooves are arranged in the up-down direction.

[0049] To ensure the fit of the plate body 100 and the occipital bone 1000, and to improve the connection stability, in some embodiments, one side of the plate body 100 with the groove 110 at the first mounting hole 121 is shaped to match the shape of the occipital bone 1000, which is designed by reverse engineering, increasing the contact area with the occipital bone 1000, avoiding concentrating the force on the occipital bone 1000 and causing damage. In other words, the shape of the plate body 100 at the fitting part of the occipital bone 1000 matches the shape of the occipital bone 1000. Specifically, the contour of the occipital bone 1000 of the patient is obtained by scanning the occipital bone 1000 of the patient by CT, and then the contour is used as the structure of the plate body 100 at the first mounting hole 121.

[0050] The shape of the one side of the plate body 100 with the groove 110 at the second mounting hole 122 is adapted to the shape of the atlas 2000, which is obtained by reverse engineering, increasing the contact area with the atlas 2000, avoiding stress concentration on the atlas 2000 and causing damage. In other words, the shape of the plate body 100 at the fitting position with the atlas 2000 is adapted to the shape of the atlas 2000. Specifically, the atlas 2000 of the patient is scanned by CT, and the contour of the atlas 2000 is obtained, and then the contour is used as the structure of the plate body 100 at the second mounting hole 122.

[0051] After the three-dimensional diagram of the plate body 100 is designed, it is prepared by machining or 3D printing. Specifically, the plate body 100 is made of titanium alloy and polyether ether ketone.

[0052] In use, in order to avoid the phenomenon of stress concentration between the dura mater and the plate body 100, the one side of the plate body 100 with the groove 110 is a smooth curved surface structure as a whole, and the groove 110 and the plate body 100 are smoothly transitioned at the first connecting part 120. That is, the edge part of the groove 110 is smoothly transitioned with the plate body 100 at the mounting hole, ensuring the safety of the dura mater and avoiding the damage of the dura mater caused by stress concentration due to the edge extrusion.

[0053] Specifically, the groove 110 is an arc-shaped groove, and the arc height of the arc-shaped groove ranges from 5mm to 15mm. In other words, the cross section of the arc-shaped groove in the horizontal direction is arc-shaped, and protrudes away from the notch 1100. After the plate body 100 is installed, the arc-shaped groove extends from top to bottom. The setting of the above-mentioned arc height range makes the cranial cavity volume have a planned capacity increase, meeting the actual needs of different patients. The shape of each plate body 100 needs to be set according to the specific situation of the patient, realizing customized treatment and ensuring the best treatment effect.

[0054] In some embodiments, the one side of the plate body 100 away from the groove 110 is a smooth curved surface structure as a whole. In use, after the plate body 100 is installed, the scalp on the outside needs to be covered and sutured, and the above-mentioned structure avoids the stress concentration of the scalp caused by the edge, thereby ensuring the safety of the scalp.

[0055] In order to facilitate design, the thickness of the plate body 100 is uniform everywhere. When designing, after the planar structure of one side of the groove 110 is determined, another plane can be obtained by translating the plane. In some embodiments, the thickness of the plate body 100 is 3mm-8mm. The specific thickness of the plate body 100 can be reasonably designed according to the size of the area of the notch 1100 and the age of the patient, as long as a certain strength is ensured, which can stably constrain the dura mater.

[0056] In other embodiments, the shape of the side of the plate body 100 away from the recess 110 can also be set reasonably according to actual conditions to ensure that the surgical site of the patient looks smoother after the plate body 100 is installed. Exemplarily, the side of the plate body 100 away from the recess 110 is a curved surface structure. Further, the connection between the side of the plate body 100 away from the recess 110 and the occipital bone 1000 is tangent to the occipital bone 1000. The connection between the side of the plate body 100 away from the recess 110 and the atlas 2000 is tangent to the atlas 2000.

[0057] In other embodiments, the edge portion of the plate body 100 gradually reduces in thickness, and the side of the plate body 100 away from the recess 110 gradually approaches the side of the plate body 100 having the recess 110. The above structure reduces the cavity volume generated between the scalp and the skull at the peripheral position of the plate body 100 on the basis of the adhesion of the plate body 100, the occipital bone 1000 and the atlas 2000, and avoids damage to the scalp caused by bumps.

[0058] Obviously, the above embodiments of the present application are only examples for clearly illustrating the present application, and are not intended to limit the embodiments of the present application. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the scope of the present application. Here, it is not necessary and impossible to enumerate all the embodiments. Any modification, equivalent substitution and improvement within the spirit and principle of the present application shall be included in the protection scope of the claims of the present application.

Claims

1. A shunt assembly for reconstituting the cistema magna, characterized in that, The plate body (100) is provided with a recess (110) on one side, and the plate body (100) is provided with a plurality of first connecting parts (120), and the plurality of first connecting parts (120) are located on the outer periphery of the recess (110) and are arranged at intervals, and the first connecting part (120) is used for connecting with the occipital bone (1000) and / or atlas (2000); The plate body (100) is provided with at least one second connecting part (130), and the second connecting part (130) is arranged on the bottom of the recess (110), and the second connecting part (130) is used for fixing the meninges; The second connecting part (130) is a fixing hole penetrating through the plate body (100), and the occipital cistern reconstruction expansion assembly further comprises a fixing member, and the meninges and the plate body (100) are connected through the fixing member; The first connecting part (120) is a mounting hole penetrating through the plate body (100), and the occipital cistern reconstruction expansion assembly further comprises a mounting screw (200), and the mounting screw (200) penetrates through the mounting hole and is screwed on the occipital bone (1000) and / or atlas (2000); The plate body (100) has a smooth curved surface structure on one side of the recess (110), and the recess (110) and the plate body (100) are smoothly transitioned at the first connecting part (120).

2. The shunt expansion assembly for reformation of the cistema magna according to claim 1, characterized in that, The fixing member is a fixing rope, the fixing rope can penetrate through the fixing hole and be fixed with the plate body (100), and is used for connecting the meninges; wherein the diameter of the fixing rope is smaller than the diameter of the fixing hole.

3. The shunt expansion assembly for reformation of the cistema magna according to claim 2, characterized in that, The plate body (100) is penetrated by a plurality of fixing holes, and the plurality of fixing holes are arranged dispersedly.

4. The shunt expansion assembly for reformation of the cistema magna according to claim 1, characterized in that, The mounting hole comprises at least two first mounting holes (121), two first mounting holes (121) are located on the upper part of the plate body (100) and are arranged on the left and right sides of the recess (110); two mounting screws (200) penetrate through the corresponding first mounting holes (121) and are screwed on the occipital bone (1000); and / or, The mounting hole comprises at least two second mounting holes (122), two second mounting holes (122) are located on the lower part of the plate body (100) and are arranged on the left and right sides of the recess (110), and two mounting screws (200) penetrate through the corresponding second mounting holes (122) and are screwed on the atlas (2000).

5. The shunt expansion assembly for reformation of the cistema magna according to claim 4, characterized in that, The plate body (100) has a shape on one side of the recess (110) at the first mounting hole (121) which is matched with the shape of the occipital bone (1000); and / or, The plate body (100) has a shape on one side of the recess (110) at the second mounting hole (122) which is matched with the shape of the atlas (2000).

6. The shunt expansion assembly for reformation of the cistema magna according to any of claims 1-5, characterized in that, The recess (110) is an arc-shaped groove, and the arc height of the arc-shaped groove ranges from 5mm to 15mm.

7. The shunt expansion assembly for reformation of the cistema magna according to any of claims 1-5, characterized in that, The plate body (100) has a smooth curved surface structure on the side away from the recess (110).

Images