An active adsorption aspiration device and aspiration method for epidural effusion

Abstract

This invention discloses an active adsorption aspiration device and method for epidural effusion, belonging to the field of cranioplasty technology. The active adsorption aspiration device includes a patch body and an adsorption pad. The patch body is shaped to match a bone window for sealing it. The inner surface of the patch body has a limiting groove, within which the adsorption pad is embedded. The adsorption pad adheres to the dura mater and adsorbs exudate. The patch body has a pad removal hole that penetrates the patch body and communicates with the limiting groove. The pad removal hole is used to remove the adsorption pad after it has become saturated. The active adsorption aspiration device for epidural effusion provided by this invention fills potential dead spaces with a flexible adsorption pad, inhibiting epidural effusion formation at its source. Simultaneously, it actively adsorbs exudate, rather than simply providing a drainage channel for the effusion. This significantly improves control over large amounts of exudate during the postoperative peak exudation period and reduces the incidence of epidural effusion.

Description

Technical Field

[0001] This invention belongs to the field of cranioplasty technology, specifically relating to an active adsorption aspiration device and aspiration method for epidural effusion. Background Technology

[0002] Skull defects are a common neurosurgical condition, often caused by trauma, tumor resection, decompression surgery for cerebral hemorrhage, etc. Cranioplasty is required to restore the integrity of the skull and protect intracranial tissues.

[0003] This requires the fabrication of a patch that matches the bone window. However, it is difficult to quickly adhere the patch to the dura mater. The three days after surgery are the peak period for inflammatory exudation, tissue edema, and micro-leakage of cerebrospinal fluid in the surgical wound. Exudate and cerebrospinal fluid can easily accumulate in the dead space between the patch and the dura mater, forming epidural effusion. In severe cases, puncture and aspiration or even a second surgery is required to clean the effusion, increasing patient suffering and medical risks.

[0004] Traditional techniques often involve creating grooves and porous structures on the patch surface to reduce fluid accumulation through passive drainage. However, passive drainage has limited effectiveness in controlling postoperative peak exudate, and the porous structure has weak absorption capacity, which cannot meet the needs of controlling fluid accumulation during the peak postoperative period.

[0005] Therefore, there is an urgent need to develop an active adsorption aspiration device and aspiration method for epidural effusion to solve the above-mentioned technical problems. Summary of the Invention

[0006] The purpose of this invention is to provide an active adsorption aspiration device and aspiration method for epidural effusion, so as to solve the technical problem that traditional passive drainage methods cannot meet the requirements for controlling the accumulation of effusion.

[0007] According to one aspect, to achieve the above objective, embodiments of the present invention provide an active adsorption aspiration device for epidural effusion, comprising a patch body and an adsorption pad layer. The patch body is configured to match the shape of a bone window for fixing within the bone window to seal it. The inner surface of the patch body has a limiting groove, and the adsorption pad layer is embedded in the limiting groove. The adsorption pad layer is used to adhere to the dura mater and adsorb exudate. The patch body has a pad removal hole that penetrates the patch body and communicates with the limiting groove. The pad removal hole is used to extract the adsorption pad layer after it has become saturated with adsorption.

[0008] In one possible implementation, there are multiple limiting grooves, each extending outward from the center of the pad-receiving hole. There are multiple adsorption pads, each corresponding to one of the multiple limiting grooves. A pad-receiving post is inserted into the pad-receiving hole, and the inner ends of the multiple adsorption pads are connected to the pad-receiving post. The pad-receiving post can detach from the pad-receiving hole under external force, so as to simultaneously extract the multiple adsorption pads from the pad-receiving hole.

[0009] In one possible implementation, the axial projection of the plurality of limiting grooves extends in a straight line or an arc.

[0010] In one possible implementation, the patch body has suction holes, which are in multiple sets. Each of the limiting grooves is provided with a set of suction holes, and the suction holes are used to communicate with an external negative pressure suction tube to suction the accumulated liquid.

[0011] In one possible implementation, each set of suction holes consists of two holes, located at the middle and outer ends of the limiting groove, respectively, with the diameter of the suction hole at the outer end being larger than that of the suction hole at the middle end.

[0012] In one possible implementation, bio-adhesive is filled between the adsorption pad layer and the bottom wall of the limiting groove.

[0013] In one possible implementation, the patch body is made of PEEK, and the absorbent pad is made of medical porous composite polyvinyl alcohol sponge.

[0014] In one possible implementation, the edge of the patch body has a plurality of suture holes for threading sutures to suture and fix the patch body to the dura mater and scalp fascia. It also includes multiple titanium connectors distributed along the outer periphery of the patch body. One end of each titanium connector is connected to the patch body, and the other end is used to connect to the skull around the bone window.

[0015] In one possible implementation, a sealing cap is also included, which is used to install into the pad removal hole after the pad removal post is disengaged from the pad removal hole, so as to seal the pad removal hole.

[0016] This invention also provides a method for active adsorption aspiration of epidural effusion, comprising the following steps: S1: The skull defect area of ​​the patient is scanned by CT / MRI to obtain skull defect data. A three-dimensional model is reconstructed based on the defect data. The main body of the patch is prepared by 3D printing technology. The absorbent pad is embedded in the limiting groove and fixed with bio-adhesive. S2: With the side of the patch body with the absorbent pad facing the dura mater, attach it to the bone window, fix the patch body to the skull with titanium connecting pieces, and suture the patch body to the dura mater and scalp fascia through the suture holes at the edge, so that the absorbent pad adheres to the dura mater and fills the dead space. S3: During the peak period of postoperative exudate, the adsorption pad actively adsorbs the tissue exudate and cerebrospinal fluid on the surface of the dura mater. At the same time, the tissue exudate and cerebrospinal fluid adsorbed by the adsorption pad from the surface of the dura mater can be aspirated by inserting a negative pressure suction tube into the suction hole. S4: After the peak of postoperative exudate, pull out the pad removal column, which will simultaneously pull out the absorbent pad layer. Use a sealing cap to seal the pad removal hole.

[0017] The significant technical advantages of this invention lie in the fact that by filling potential dead spaces with a flexible absorbent pad, the formation of epidural effusion is suppressed at its source. Simultaneously, it actively absorbs exudate, rather than simply providing a drainage channel for the effusion. This results in more significant control over large amounts of exudate during the postoperative peak exudation period, reducing the incidence of epidural effusion. The radially distributed structure of the absorbent pad allows for extraction, thereby removing the absorbent material and avoiding the potential risk of foreign body retention. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the structure of the outer surface of the patch body in one embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of the inner surface of the patch body in one embodiment of the present invention; Figure 3 This is a schematic diagram of the structure of the adsorption pad layer at one angle in one embodiment of the present invention; Figure 4 This is a schematic diagram of the structure of the adsorption pad layer from another angle in one embodiment of the present invention; Figure 5 This is a schematic diagram of the sealing cap structure in one embodiment of the present invention; Figure 6 This is a schematic diagram of the structure of the titanium connecting piece in one embodiment of the present invention; Figure 7 This is a schematic diagram of the structure after the patch body is installed onto the skull in one embodiment of the present invention.

[0020] In the diagram: 100, patch body; 200, absorbent pad; 101, limiting groove; 102, pad removal hole; 300, pad removal column; 103, suction hole; 104, suture hole; 400, titanium connecting piece; 500, sealing cap. Detailed Implementation

[0021] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0023] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0024] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0025] In the description of the embodiments of this application, the term "and / or" is merely a description of the association relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship. In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple groups" refers to two or more groups (including two groups), and "multiple pieces" refers to two or more pieces (including two pieces).

[0026] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" 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 the embodiments of this application and simplifying the description, and are not intended to 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 embodiments of this application.

[0027] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation", "connection", "linking", and "fixing" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components.

[0028] This embodiment provides an active adsorption and aspiration device for epidural effusion, mainly used in neurosurgical cranioplasty to prevent early postoperative epidural effusion complications. This design uses an adsorption pad 200 to fill dead space, physically filling the potential gap between the patch body 100 and the dura mater, actively adsorbing tissue fluid and cerebrospinal fluid during the peak postoperative exudation period. Furthermore, the saturated adsorption pad 200 can be pulled out entirely by traction, avoiding foreign body retention. An aspiration port 103 is also designed to handle emergencies with excessive exudation, improving the control of epidural effusion without increasing surgical trauma.

[0029] Please see Figures 1-7 The illustration shows an active adsorption aspiration device for epidural effusion in one embodiment of the present invention, including a patch body 100, an adsorption pad 200, a padding column 300, an aspiration hole 103, and a sealing cap 500.

[0030] The main body of the patch 100 is made of medical-grade PEEK material using 3D printing technology. Its shape and curvature match the bone window of the patient's skull defect, and its thickness is 3-5 mm. The X-ray permeability of PEEK material and its elastic modulus close to that of the skull ensure that postoperative imaging examinations are not interfered with, meeting the requirements for skull repair.

[0031] The inner surface of the patch body 100 facing the dura mater has multiple limiting grooves 101. All limiting grooves 101 extend radially outward from the central retrieval hole 102 of the patch, forming a star-shaped layout. This central radial layout allows multiple grooves to evenly cover different areas of the dura mater, achieving full-area adsorption coverage and avoiding adsorption dead zones. Furthermore, since all grooves converge at the central retrieval hole 102, multiple adsorption pads 200 can be uniformly pulled out through the central retrieval column 300.

[0032] The depth of the limiting groove 101 is set to 0.8~1.5mm, and the groove width is adapted to the width of the adsorption pad 200, forming a stable lateral limiting for the adsorption pad 200, preventing displacement and wrinkling, and ensuring that the pad is always in close contact with the dura mater; while also preventing the pad from protruding excessively from the inner surface of the patch, thus avoiding space-occupying pressure on the dura mater. The inner wall of the limiting groove 101 is micro-smoothed, which can reduce the frictional resistance when the adsorption pad 200 is pulled out, reducing the risk of traction breakage.

[0033] Furthermore, the absorbent pads 200 are embedded one-to-one in each limiting groove 101. They are made of medical porous composite polyvinyl alcohol sponge with a thickness of 1.5mm. They have a high liquid absorption rate and excellent biocompatibility. After implantation, there is no obvious tissue irritation or foreign body reaction. Moreover, the expansion rate of this material after absorption saturation is ≤10%, which can avoid the intracranial space-occupying effect caused by volume expansion after liquid absorption and ensure the stability of intracranial pressure.

[0034] The adsorption pad 200 and the bottom wall of the limiting groove 101 are lightly composited and fixed with medical biological adhesive. During the implantation stage, the adsorption pad 200 and the patch body 100 can be relatively fixed and will not shift. When it is pulled outward after the operation, the bonding strength of the biological adhesive is lower than the tensile strength of the adsorption pad 200 itself. It can be peeled off under the pulling force, which does not affect the extraction operation and will not cause the residue to break due to excessive adhesion.

[0035] The flexible absorbent pad 200 can adaptively conform to the physiological curvature of the dura mater, filling the potential dead space between the patch and the dura mater, eliminating space for fluid accumulation. Simultaneously, the capillary action of the absorbent pad 200 actively traps exudated tissue fluid and trace amounts of cerebrospinal fluid, preventing free flow and accumulation. Compared to traditional techniques, which merely provide a flow channel for exudate and fail to prevent fluid accumulation, this approach, through the absorbent pad 200, not only fills dead spaces but also actively absorbs exudate, fundamentally inhibiting the formation of epidural effusion.

[0036] Furthermore, a pad removal hole 102 is provided at the center of the patch body 100. The pad removal hole 102 penetrates the patch body 100 along the thickness direction and is connected to the radially distributed limiting grooves 101. A pad removal post 300 is inserted into the pad removal hole 102, and the inner ends of all the adsorption pads 200 are connected to the side wall of the pad removal post 300.

[0037] Once the postoperative exudation peak has ended and the absorbent pad 200 has reached saturation, simply clamp the outer end of the retrieval column 300 and pull it outward along the axial direction. This will cause all the absorbent pads 200 to converge towards the center along the limiting groove 101 and eventually be pulled out of the skull along with the retrieval column 300. This avoids the risks of a second craniotomy and patient suffering, while also removing the absorbent pads 200 and eliminating the risks that may be caused by foreign body retention.

[0038] The extension shape of the limiting groove 101 can be designed as a straight line or an arc. A straight line is easy to process, and when the adsorption pad 200 is pulled out, the pad column 300 can be pulled out directly along the axial direction, which is convenient to operate. An arc shape can extend the length of the adsorption pad 200 with the same radius, expand the adsorption coverage area, and when pulling out, an axial pulling force can be applied outward while the pad column 300 is slowly rotated along the arc direction to guide the adsorption pad 200 out.

[0039] Furthermore, the patch body 100 is also provided with multiple sets of suction holes 103, each set of suction holes 103 corresponding to and connected to a limiting groove 101. The suction holes 103 penetrate along the thickness direction of the patch body 100, allowing the insertion of an external negative pressure suction tube to actively suction the internal effusion, serving as an active and controllable means in addition to the absorbent pad 200. When the postoperative exudate volume increases abnormally and the absorbent pad 200 rapidly approaches saturation, negative pressure drainage can be performed through the suction holes 103 to quickly reduce the epidural pressure, preventing the effusion from compressing brain tissue. This eliminates the need to wait for the absorbent pad 200 to absorb naturally, improving adaptability to different levels of exudation.

[0040] Two suction holes 103 are provided in each group, located in the middle and outer ends of the corresponding limiting groove 101, respectively. The diameter of the suction hole 103 located at the outer end is larger than that of the suction hole 103 located in the middle. The outer end corresponds to the low-lying fluid accumulation area at the edge of the bone window, which is a place where fluid is prone to accumulate. Therefore, the diameter of the suction hole 103 located at the outer end is designed to be larger to provide a larger suction flow and quickly drain the fluid.

[0041] After the scalp is sutured post-surgery, the main body of the patch 100 is covered by the scalp and cannot be observed. Doctors can distinguish the positions of suction holes 103 of different diameters by touching the unevenness under the scalp, and then determine the direction and distribution of the limiting groove 101. This eliminates the need for additional imaging guidance such as CT scans, improving the convenience of bedside operation after surgery.

[0042] Furthermore, the edge of the patch body 100 has multiple suture holes 104 distributed circumferentially, with a diameter of approximately 1.5 mm, allowing sutures to pass through. During the operation, the patch edge can be sutured and fixed to the dura mater and scalp fascia through the suture holes 104, reducing relative sliding between the patch and the dura mater, avoiding friction stimulation that generates more exudate, and maintaining a tight fit between the absorbent pad layer 200 and the dura mater to ensure stable absorbency.

[0043] The titanium connecting pieces are distributed circumferentially along the patch body 100. One end is fixedly connected to the edge of the patch body 100, and the other end can be fixed to the skull around the bone window by titanium nails to fix the patch body 100 and ensure the structural stability of the skull after repair.

[0044] After the absorbent pad 200 is completely extracted along with the pad removal column 300, the sealing cap 500 can be embedded and fixed in the pad removal hole 102 to seal the pad removal hole 102, isolate the intracranial cavity from the outside world, and the sealing cap 500 can fill the depression of the pad removal hole 102, so that the outer surface of the patch body 100 remains flat and avoids the scalp in the corresponding position from being depressed, which would affect the postoperative appearance.

[0045] The inner surface edge of the sealing cap 500 is provided with multiple spring pieces along the circumferential direction. The ends of the spring pieces have wedge-shaped hooks. When inserted into the pad removal hole 102, the ends of the wedge-shaped hooks are squeezed by the inner wall of the pad removal hole 102, causing the spring pieces to deform in the center direction, so that the wedge-shaped hooks enter the pad removal hole 102. Under the action of the elastic restoring force of the spring pieces, the wedge-shaped hooks abut against the inner edge of the pad removal hole 102, and the sealing cap 500 is fixed at the pad removal hole 102.

[0046] Based on the above-described device, this embodiment also provides a method for active adsorption aspiration of epidural effusion, specifically including the following steps: S1 Preoperative preparation: The patient's skull defect area is scanned by CT / MRI to obtain three-dimensional skull data and reconstruct a three-dimensional model of the bone window. Based on this, a PEEK patch body 100 matching the bone window is prepared using 3D printing technology. The absorbent pad 200 is embedded in the corresponding limiting groove 101 and lightly bonded and fixed with medical biological adhesive.

[0047] S2 Intraoperative Implantation and Fixation: During cranioplasty, the side of the patch body 100 with the absorbent pad 200 is placed facing the dura mater and fitted into the bone window position; the patch body 100 is fixed to the surrounding skull through the peripheral titanium connectors and titanium screws to complete the fixation; the patch body 100 is sutured to the dura mater and scalp fascia through the suture holes 104 at the edge, so that the absorbent pad 200 is tightly attached to the surface of the dura mater and fills the potential dead space between the patch body 100 and the dura mater.

[0048] Postoperative exudation peak control during S3: During the peak exudation period of 1-3 days postoperatively, the absorbent pad 200 actively absorbs tissue fluid and trace amounts of cerebrospinal fluid exudated from the dura mater surface through capillary adsorption, locking the fluid inside and preventing its accumulation in the interstitial space to form epidural effusion. If the patient has a large amount of exudate and an increasing trend of effusion is observed, a negative pressure suction tube can be inserted at the suction port 103 and connected to a negative pressure device for active and controllable suction to quickly drain excess effusion and relieve intracranial pressure.

[0049] S4 Postoperative Absorbent Pad 200 Removal: After the peak of exudation has passed and the risk of fluid accumulation has significantly decreased, the pad removal column 300 is held and slowly pulled outward along the axial direction, causing all the absorbent pads 200 to converge towards the center along the limiting groove 101 and be completely removed from the skull; the sealing cap 500 is embedded and fixed in the pad removal hole 102, and the scalp incision is sutured.

[0050] Compared with existing passive drainage skull patches, the active adsorption aspiration device and aspiration method for epidural effusion provided in this embodiment have the following advantages: The flexible absorbent pad 200 can fill potential dead spaces, inhibiting epidural effusion formation at its source. It actively absorbs exudate rather than simply providing a drainage channel, resulting in more significant control over large amounts of exudate during the postoperative peak period and reducing the incidence of epidural effusion. The radially distributed structure of the absorbent pad 200 allows for extraction, removing the absorbent material and avoiding the potential risk of foreign body retention.

[0051] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of protection of the claims of the present invention.

Claims

1. An epidural fluid active adsorption type suction device, characterized by, The device includes a patch body (100) and an absorbent pad (200). The patch body (100) is configured to match the shape of a bone window and is used to fix it inside the bone window to seal it. The inner surface of the patch body (100) has a limiting groove (101). The absorbent pad (200) is embedded in the limiting groove (101) and is used to adhere to the dura mater and absorb exudate. The patch body (100) has a pad removal hole (102). The pad removal hole (102) penetrates the patch body (100) and communicates with the limiting groove (101). The pad removal hole (102) is used to remove the absorbent pad (200) after it has been saturated with absorbent.

2. The active adsorption aspiration device for epidural effusion according to claim 1, characterized in that, There are multiple limiting grooves (101), and each of the multiple limiting grooves (101) extends outward from the center of the pad removal hole (102). There are multiple adsorption pads (200) and each is embedded in one of the multiple limiting grooves (101). A pad removal post (300) is inserted into the pad removal hole (102). The inner ends of the multiple adsorption pads (200) are connected to the pad removal post (300). The pad removal post (300) can be disengaged from the pad removal hole (102) under the action of external force, so as to simultaneously pull out the multiple adsorption pads (200) from the pad removal hole (102).

3. The active adsorption aspiration device for epidural effusion according to claim 2, characterized in that, The axial projection of the plurality of limiting grooves (101) extends in a straight line or an arc.

4. The active adsorption aspiration device for epidural effusion according to claim 1, characterized in that, The patch body (100) has suction holes (103), and there are multiple sets of suction holes (103). Each limiting groove (101) is provided with a set of suction holes (103). The suction holes (103) are used to communicate with an external negative pressure suction tube to suction the accumulated liquid.

5. The active adsorption aspiration device for epidural effusion according to claim 4, characterized in that, Each set of suction holes (103) consists of two holes, located at the middle and outer ends of the limiting groove (101) respectively. The diameter of the suction hole (103) located at the outer end is larger than the diameter of the suction hole (103) located at the middle end.

6. The active adsorption aspiration device for epidural effusion according to claim 1, characterized in that, The space between the adsorption pad layer (200) and the bottom wall of the limiting groove (101) is filled with bio-glue.

7. The active adsorption aspiration device for epidural effusion according to claim 1, characterized in that, The patch body (100) is made of PEEK, and the absorbent pad (200) is made of medical porous composite polyvinyl alcohol sponge.

8. The active adsorption aspiration device for epidural effusion according to claim 1, characterized in that, The edge of the patch body (100) has a plurality of suture holes (104) for threading sutures to suture and fix the patch body (100) to the dura mater and scalp fascia. It also includes a plurality of titanium connecting pieces (400) distributed along the outer periphery of the patch body (100), one end of the titanium connecting piece (400) being connected to the patch body (100) and the other end being used to connect to the skull around the bone window.

9. The active adsorption aspiration device for epidural effusion according to claim 2, characterized in that, It also includes a sealing cap (500) for installing into the pad removal hole (102) after the pad removal post (300) is disengaged from the pad removal hole (102) to seal the pad removal hole (102).

10. A method for active adsorption-type aspiration of epidural effusion, characterized in that, Includes the following steps: S1: The skull defect area of ​​the patient is scanned by CT / MRI to obtain skull defect data. A three-dimensional model is reconstructed based on the defect data. The main body of the patch (100) is prepared by 3D printing technology. The absorbent pad (200) is embedded into the limiting groove (101) and fixed with bio-adhesive. S2: Place the patch body (100) with the side of the absorbent pad (200) facing the dura mater and attach it to the bone window. Fix the patch body (100) to the skull through the titanium connector (400). Suture the patch body (100) to the dura mater and scalp fascia through the suture hole (104) at the edge, so that the absorbent pad (200) is attached to the dura mater and fills the dead space. S3: During the peak period of postoperative exudate, the adsorption pad (200) actively adsorbs the tissue exudate and cerebrospinal fluid on the surface of the dura mater. At the same time, the tissue exudate and cerebrospinal fluid adsorbed by the adsorption pad (200) from the surface of the dura mater can be aspirated by inserting a negative pressure suction tube into the suction hole (103). S4: After the peak of postoperative exudate, pull out the padding column (300) and simultaneously pull out the absorbent pad (200). Use the sealing cap (500) to seal the padding hole (102).

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