A skull plug for securing a drain

Abstract

The present application relates to a skull plug for fixing a drainage tube, comprising a sleeve and an insert installed in the sleeve, the insert is provided with a channel for the drainage tube to pass through; the insert comprises an upper disc, a lower disc and at least two clamping lines connecting the upper disc and the lower disc, the clamping lines are used for fixing the drainage tube; the upper disc is located at the upper end of the sleeve and can rotate relative to the sleeve, and the lower disc is fixedly connected with the lower end of the sleeve. The skull plug of the present application can gradually reduce the minimum distance between the clamping lines and the central axis of the insert by rotating the upper disc of the insert, so that it can be used to fix drainage tubes of different diameters; and the process of installing and removing the drainage tube will not cause trauma to the tissue, and the operation is simple and convenient to use.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of medical devices, and more particularly, to a skull plug for fixing a drainage tube. BACKGROUND

[0002] In the field of neurosurgery, in order to treat certain brain diseases such as subdural hematoma, subdural hydrops, ventriculitis, etc., it is necessary to insert a drainage tube or catheter through the skin and skull for the purpose of absorbing and removing blood or cerebrospinal fluid. In clinical practice, sutures or patches are often used to fix the drainage tube, which can easily cause trauma to the tissue, and the installation and removal process is not convenient to operate, and in daily life, it is also easy to cause the loosening or movement of the fixed structure, which can lead to the slipping or displacement of the drainage tube. Therefore, there is a wide demand and great significance in developing a product that is convenient to operate and can stably fix the drainage tube in clinical practice.

[0003] CN220695659U discloses a drainage tube fixing device, which comprises an embedded tube for the drainage tube to pass through, the embedded tube is used for inserting into the cranial hole of the skull, a plurality of connecting plates are fixedly arranged on the peripheral wall of the embedded tube and arranged radially along the embedded tube, a fixing mechanism is arranged between the connecting plates and the skull, the connecting plates and the skull are fixed by the fixing mechanism, thereby improving the stability of the embedded tube, and since the drainage tube is inserted into the inside of the skull through the embedded tube, the shaking of the drainage tube is prevented, and the precision of the fixation of the drainage tube is improved. However, the inner diameter of the insertion hole in the embedded tube in this patent is matched with the diameter of the drainage tube, and it can only be applied to drainage tubes with a specific diameter, and cannot be applied to drainage tubes with different diameters, thereby limiting its application range. SUMMARY

[0004] To overcome the above technical problems, the present application provides a skull plug for fixing a drainage tube, which can be applied to fix drainage tubes with different diameters.

[0005] To solve the above technical problems, the technical solution adopted by the present application is as follows: a skull plug for fixing a drainage tube, comprising a sleeve and an embedded part installed in the sleeve, the embedded part is provided with a channel for the drainage tube to pass through; the embedded part comprises an upper disc, a lower disc and a plurality of clamping wires connecting the upper disc and the lower disc, the clamping wires are used for fixing the drainage tube; the upper disc is located at the upper end of the sleeve and can rotate relative to the sleeve, and the lower disc is fixedly connected with the lower end of the sleeve.

[0006] By rotating the upper disc relative to the sleeve, the minimum distance between the clamping wires and the central axis of the embedded part can be gradually reduced, thereby fixing the drainage tube.

[0007] In the technical scheme, the sleeve is inserted into the cranial hole to be plugged and fixed on the skull, the inner insert is installed in the sleeve, and the drainage tube extends into the cranial cavity through the channel in the inner insert. When the drainage tube is to be fixed, the upper disc is rotated to gradually reduce the minimum distance between the clamping wire and the central axis of the inner insert until the clamping wire clamps and fixes the drainage tube. Since the minimum distance between the clamping wire and the central axis of the inner insert has a certain variation range, the drainage tube of different diameters can be clamped and fixed, which is convenient for clinical application.

[0008] Further, the upper disc and the lower disc are provided with through holes penetrating through the upper disc and the lower disc, and the through holes and the area surrounded by the clamping wires form a channel for the drainage tube to pass through.

[0009] Further, the sleeve is provided with a cavity penetrating through the sleeve in the axial direction, one end of the cavity is provided with a first accommodating cavity, the other end of the cavity is provided with a second accommodating cavity, the upper disc is located in the first accommodating cavity and can rotate relative to the sleeve, the upper disc is provided with a first limiting part for limiting the position of the upper disc in the first accommodating cavity, and the lower disc is located in the second accommodating cavity and is fixedly connected relative to the circumferential direction of the sleeve. Further, the lower disc is detachably connected with the sleeve, the lower disc is provided with a second limiting part for limiting the rotation of the lower disc in the second accommodating cavity.

[0010] The first limiting part can be a protrusion or a recess provided on the upper disc, and the first accommodating cavity can be provided with a plurality of corresponding limiting points, such as a protrusion corresponding to a recess and a recess corresponding to a protrusion. During rotation of the upper disc, the first limiting part matches and is fixed in the limiting point, thereby limiting the upper disc at different circumferential positions in the first accommodating cavity, so that the upper disc cannot move relative to the sleeve without external force. The second limiting part can be a protrusion or a recess provided on the lower disc, and the second accommodating cavity can be provided with a corresponding recess or protrusion. When the upper disc rotates, the second limiting part remains stationary in the second accommodating cavity. The second limiting part can also be other fixedly connected components such as fasteners, but this form will affect the disassembly efficiency of the inner insert.

[0011] Further, the initial length of the clamping wire is greater than or equal to the distance between the upper disc and the lower disc, which can make the variation range of the minimum distance between the clamping wire and the central axis of the inner insert larger. The initial length refers to the length of the clamping wire when the connection points of the clamping wire and the upper disc and the lower disc are on the same vertical line. The clamping wire itself has a certain elastic deformation amount, so even if the initial length of the clamping wire is equal to the distance between the upper disc and the lower disc, the minimum distance between the clamping wire and the central axis of the inner insert can gradually decrease when the upper disc rotates, but the decrease range will be insufficient, and the diameter range of the fixed drainage tube can be relatively narrow. The distance between the upper disc and the lower disc refers to the straight-line distance between the upper disc and the lower disc when the inner insert is installed in the set.

[0012] Further, the cross section of the clamping wire is circular, the breaking elongation of the clamping wire is greater than 10%, and / or the clamping wire is made of polyether ether ketone material. When the breaking elongation of the clamping wire is greater than 10%, the variation range of the minimum distance between the clamping wire and the central axis of the inner insert can be larger, thereby fixing a larger diameter range of the drainage tube. The polyether ether ketone material has good mechanical properties, good toughness and impact resistance, and can maintain good integrity and stability under complex stress, and has good biocompatibility.

[0013] Further, the clamping wire is equidistantly distributed along the circumference of the upper disc, and / or the middle section of the clamping wire is provided with a plurality of protrusions. The clamping wire can provide the drainage tube with multiple and uniform stress points in the circumferential direction, thereby better clamping and fixing the drainage tube. The protrusions can increase the friction between the contact positions of the clamping wire and the drainage tube, thereby improving the clamping and fixing effect of the drainage tube and preventing the drainage tube from sliding in the channel.

[0014] Further, the first limiting part is a pawl, and the set is provided with a plurality of recessed parts which are distributed in the circumferential direction and match the outer shape of the pawl at the first accommodating cavity. After rotating the upper disc and clamping the drainage tube under external force operation, the pawl can ensure that the upper disc does not rotate in the opposite direction to cause the drainage tube to loosen during use without external force.

[0015] Further, the inner side surface of the recessed part includes a limiting surface for limiting the reverse rotation of the pawl and a matching surface for the forward rotation of the pawl, and the included angle between the limiting surface and the inner contour surface of the first accommodating cavity is 100°-120°, and the included angle between the matching surface and the inner contour surface of the first accommodating cavity is 140°-160°.

[0016] Further, the upper disc is provided with an abutting part, and the first accommodating cavity is provided with a supporting part, and the bottom surface of the abutting part is attached to the top surface of the supporting part. The supporting part can always keep the supporting and limiting state of the abutting part, and when the upper disc is rotated, even if the first limiting part is located between the two limiting points, the supporting part can ensure that the upper disc will not fall off.

[0017] Further, the side surface of the upper disc is provided with a rotation scale line, and the first limiting part is located at the scale line.

[0018] Further, the top surface of the upper disc is provided with a tool connecting groove for inserting a tool. The insert is installed in the kit, and the tool is inserted through the tool connecting groove, which facilitates the operation of rotating the upper disc.

[0019] Further, the kit comprises a cap part and a sleeve part located below the cap part, and a plurality of nail holes for fixing bone nails are arranged on the edge of the cap part away from the sleeve part. After the kit is installed in the skull hole to be plugged, the lower end surface of the cap part abuts against the outer surface of the skull, which can avoid excessive insertion of the kit in the skull hole, and the kit is fixed on the skull by the bone nails passing through the nail holes, thereby improving the stability of the kit. The cap part and the sleeve part can be integrally formed.

[0020] Compared with the prior art, the beneficial effects of the present application are:

[0021] The skull plug for fixing a drainage tube of the present application cooperates with the insert and the kit, rotates the upper disc of the insert relative to the kit, gradually reduces the minimum distance between the clamping wire and the central axis of the insert, and can be suitable for fixing drainage tubes of different diameters. Moreover, the operation is simple, the fixation and removal of the drainage tube can be quickly realized, the drainage tube does not need to be fixed on the scalp by using a suture or a patch, and the process of installing and removing the drainage tube will not cause trauma to the tissue, thereby facilitating intraoperative use.

[0022] The skull plug for fixing a drainage tube of the present application is provided with a channel for the drainage tube to pass through, after the drainage treatment is completed, the skull plug can still be used for plugging the bone hole after the drainage tube is removed, which avoids the exposure of the bone hole after the drainage tube is removed and the risk caused by the secondary operation. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is a structural schematic view of a kit of a skull plug for fixing a drainage tube of the present application;

[0024] Figure 2 is a structural schematic view of an insert of a skull plug for fixing a drainage tube of the present application;

[0025] Figure 3is a schematic view of the combination of the kit of the skull plug for fixing the drainage tube and the upper disc of the present application;

[0026] Figure 4 is a schematic view of the combination of the recess of the kit of the skull plug and the first limiting part of the upper disc of the present application;

[0027] Figure 5 is a schematic view of the change of the clamping line during the rotation of the upper disc of the skull plug relative to the kit of the present application;

[0028] Figure 6 is a schematic view of the change of the clamping line of the skull plug of the present application.

[0029] In the drawings:

[0030] 100 - kit; 110 - cavity; 120 - first accommodating cavity; 130 - second accommodating cavity; 140 - recess; 141 - limiting surface; 142 - accommodating surface; 150 - plug cap part; 160 - sleeve part; 151 - nail hole; 200 - inner insert; 210 - upper disc; 211 - first limiting part; 212 - abutting part; 213 - tool connecting groove; 220 - lower disc; 221 - second limiting part; 230 - clamping line; 300 - clamping area. DETAILED DESCRIPTION

[0031] The drawings are only used for illustrative description, and should not be understood as limiting the present patent; in order to better illustrate the present embodiment, some components in the drawings may be omitted, enlarged or reduced, and do not represent the actual product size; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted. The positional relationship described in the drawings is only used for illustrative description, and should not be understood as limiting the present patent.

[0032] The same or similar reference numerals in the drawings of the embodiments of the present application correspond to the same or similar components; in the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "long" and "short" is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore the terms describing the positional relationship in the drawings are only used for illustrative description, and should not be understood as limiting the present patent, and for those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0033] The technical solutions of the present application will be further described in detail below through specific embodiments, and in conjunction with the drawings:

[0034] Embodiment 1

[0035] As Figures 1-6The figure shows a first embodiment of a skull plug for fixing a drainage tube, comprising a kit 100 and an insert 200 installed in the kit 100. The height of the insert 200 is less than or equal to the height of the kit 100, and the insert 200 is provided with a channel for the drainage tube to pass through. The kit 100 is provided with a cavity 110 that passes through the kit 100 in the axial direction. One end of the cavity 110 is provided with a first accommodating cavity 120, and the other end of the cavity 110 is provided with a second accommodating cavity 130. The sleeve 200 includes an upper plate 210, a lower plate 220, and a plurality of clamping wires 230 connecting the upper plate 210 and the lower plate 220. The clamping wires 230 are used to secure the drainage tube. The upper plate 210 is located in the first accommodating cavity 120 and can rotate relative to the sleeve 100. The upper plate 210 is provided with a first limiter 211, which is used to limit the position of the upper plate 210 within the first accommodating cavity 120. The lower plate 220 is located in the second accommodating cavity 130 and is fixedly connected to the sleeve 100. Both the upper plate 210 and the lower plate 220 are provided with through-holes. The area enclosed by the through-holes and the plurality of clamping wires 230 forms a passage for the drainage tube to pass through.

[0036] In this embodiment, the upper plate 210 and the lower plate 220 are both hollow cylinders, whose outer diameters are adapted to the inner diameter of the kit 100, and are preferably slightly smaller than the inner diameter of the kit 100, so as to facilitate the rotation of the upper plate 210 relative to the kit 100.

[0037] In this embodiment, if Figure 3 As shown, the first limiting portion 211 is a pawl, and the kit 100 is provided with a plurality of circumferentially distributed recessed portions 140 adapted to the pawl at the first accommodating chamber 120. The inner side surfaces of the recessed portions 140 are respectively a limiting surface 141 for limiting the reverse rotation of the pawl and a contact surface 142 for allowing the pawl to rotate forward. When the upper plate 210 is rotated under external force so that the clamping line 230 clamps and fixes the drainage tube, the pawl can ensure that the upper plate 210 will not rotate in the reverse direction without external force during use, causing the drainage tube to loosen. Figure 4 As shown, the depth of the recessed portion 140 is 1 mm, the angle a between the limiting surface 141 and the inner contour surface of the first accommodating cavity 120 is 110°, and the angle b between the meeting surface 142 and the inner contour surface of the first accommodating cavity 120 is 150°.

[0038] In the embodiment, the kit 100 comprises a cap portion 150 and a sleeve portion 160 below the cap portion 150, the cap portion 150 is integrally formed, the cap portion 150 is provided with a plurality of nail holes 151 for fixing the bone nail on the edge away from the sleeve portion 160. The sleeve portion 160 has an outer diameter matched with the cranial hole to be plugged, and the height of the sleeve portion 160 is consistent with the depth of the cranial hole to be plugged. The sleeve portion 160 is a circular tube, the diameter of the cap portion 150 is greater than the outer diameter of the sleeve portion 160, and the upper end face and the lower end face of the cap portion 150 are both flat. The upper end face and / or the lower end face of the cap portion 150 can also be designed as an arc-shaped curved surface, and is not limited to the illustrated embodiment. After the kit 100 is loaded into the cranial hole to be plugged, the lower end face of the cap portion 150 abuts against the outer surface of the skull, which can avoid excessive insertion of the kit 100 in the cranial hole, and the kit 100 is fixed on the skull by the bone nail passing through the nail hole 151, thereby improving the stability of the kit 100, and since the drainage tube needs to pass through the inner insert in the kit 100 to extend into the intracranial, the stability of the drainage tube 102 can be ensured.

[0039] The initial length of the clamping wire 230 is greater than or equal to the distance between the upper disc 210 and the lower disc 220, which can make the change range of the minimum distance between the clamping wire 230 and the central axis of the inner insert 200 larger. The initial length refers to the length of the clamping wire when the connection points of the clamping wire with the upper disc and the lower disc are on the same vertical line. The distance between the upper disc 210 and the lower disc 220 refers to the straight-line distance between the upper disc 210 and the lower disc 220 when the inner insert 200 is installed in the kit 100. The distance between the upper disc 210 and the lower disc 220 is 4mm-8mm, which can be reasonably set according to the thickness of the skull in actual conditions. In the embodiment, the distance between the upper disc 210 and the lower disc 220 is 4mm. The clamping wire 230 itself has a certain elastic deformation amount, so even if the initial length of the clamping wire 230 is equal to the distance between the upper disc 210 and the lower disc 220, the minimum distance between the clamping wire 230 and the central axis of the inner insert 200 can gradually decrease when the upper disc 210 rotates, but the decrease range will be insufficient, and the diameter range of the drainage tube that can be clamped and fixed will also be relatively narrow. In the embodiment, the cross section of the clamping wire 230 is circular, the breaking elongation of the clamping wire 230 is more than 10%, and the material is polyether ether ketone, which can make the change range of the minimum distance between the clamping wire 230 and the central axis of the inner insert 200 larger, thereby fixing the drainage tube with a larger diameter range.

[0040] Specifically, the clamping wires 230 are equidistantly distributed along the circumference of the upper disc 210. The clamping wires 230 can provide the drainage tube with multiple and uniform stress points in the circumferential direction, which can better clamp and fix the drainage tube. The number of the clamping wires 230 is 7-16. The number of the clamping wires 230 can be reasonably set in combination with actual conditions according to the circumference of the upper disc 210 and the lower disc 220.

[0041] In addition, the upper disc 210 is provided with a tool connection groove 213 for tool insertion. The inner insert 200 is installed in the set 100, and a tool is inserted through the tool connection groove 213 to facilitate the rotation of the upper disc 210.

[0042] The working principle of the embodiment is as follows:

[0043] The set 100 is inserted into a cranial hole to be plugged, and the set 100 is fixed on the skull through the bone nail passing through the nail hole 151. The inner insert 200 is installed in the set 100, the drainage tube passes through the through hole of the upper disc 210, the cavity 110 and the through hole of the lower disc 220 and extends into the skull, and the lower end surface of the plug cap portion 150 abuts on the outer surface of the skull. When the drainage tube is to be fixed, the upper disc 210 is rotated relative to the lower disc 220 and the set 100 because the lower disc 220 does not rotate in the set 100. The state change of the clamping line 230 when the upper disc 210 is rotated is shown in Figure 5 . Figure 5 A in FIG. 4 is a schematic view of the state before the upper disc 210 is rotated, and the initial length of the clamping line 230 is greater than the distance between the upper disc 210 and the lower disc 220, so the clamping line 230 is in a relaxed state, and the drainage tube is not fixed at this time. Figure 5 B in FIG. 4 is a case where the clamping line 230 is just straightened, and the points between all the clamping lines 230 and the center axis of the inner insert 200 form a clamping area 300 at this time. At this time, the clamping area 300 is in a state of maximum diameter, and the drainage tube with the maximum diameter can be fixed. Figure 5 C in FIG. 4 is a case where the clamping line 230 is in a maximum stretched state, and the clamping area 300 is in a state of minimum diameter at this time, and the drainage tube with the minimum diameter can be fixed. With the rotation of the upper disc 210, the clamping line 230 can make the clamping area 300 in different states, so as to fix the drainage tubes with different diameters.

[0044] The specific change principle of the clamping line 230 can be seen from Figure 6, the straight line distance between the upper disc 210 and the lower disc 220 is L1, and the initial length of the clamping line 230 is L2. When the upper disc 210 rotates relative to the set 100, the straight line distance between the position B of the connection of the clamping line 230 and the upper disc 210 after rotation and the position A before rotation is A-1, and at this time the diameter of the clamping area 300 formed by the clamping line 230 is φ1-1, and the outer diameter of the clamping fixed drainage tube is φ2-1. The upper disc 210 continues to rotate, and the straight line distance between the position C of the connection of the clamping line 230 and the upper disc 210 after rotation and the position A before rotation is A-2, and at this time the diameter of the clamping area 300 formed by the clamping line 230 is φ1-2, and the outer diameter of the clamping fixed drainage tube is φ2-2. In the process of clamping the drainage tube by the clamping line 230, because the material of the drainage tube is rubber, which is softer than the clamping line 230 made of polyether ether ketone, the drainage tube will deform before the clamping line 230, so as to be clamped and fixed by the clamping line 230.

[0045] The outer diameter of the commonly used drainage tube in clinic ranges from 2.9mm to 4.7mm. In actual situation, the straight line distance of the rotation of the upper disc 210 can be calculated according to the range of the outer diameter of the fixed drainage tube, and then the pawl corresponding to the position of the upper disc 210 is set, and the recess 140 matched with the pawl is set in the first accommodating cavity 120.

[0046] The beneficial effects of the embodiment are as follows: after the set 100 is inserted into the cranial hole to be plugged and fixed on the skull, and the drainage tube passes through the embedded part 200 installed in the set 100, the minimum distance between the clamping line 230 and the central axis of the embedded part 200 is gradually reduced by rotating the upper disc 210 relative to the set 100, that is, the diameter of the clamping area 300 is gradually reduced, so as to realize the fixation of the drainage tube with different diameters; when the drainage tube needs to be taken out after the drainage treatment is completed, the clamping line 230 can be restored to the initial state or the state of not clamping the drainage tube by reversely rotating the upper disc 210 by applying external force, and at this time the drainage tube can be taken out. It can be seen that the skull plug for fixing the drainage tube of the present application will not cause trauma to the tissue during the installation and removal of the drainage tube, and the operation is simple and convenient for use in surgery. Moreover, after the drainage tube is taken out, the skull plug can still be used for plugging the bone hole, avoiding the exposure of the bone hole after the drainage tube is taken out and the risk of secondary surgery.

[0047] Embodiment 2

[0048] Embodiment 2 of a skull plug for fixing a drainage tube, based on embodiment 1, differs from embodiment 1 in that, as Figure 2As shown, the upper disc 210 is provided with an abutting portion 212, and the first accommodating cavity 120 is provided with a supporting portion, the bottom surface of the abutting portion 212 is attached to the top surface of the supporting portion. The supporting portion can always keep the supporting and limiting state of the abutting portion 212, and when the upper disc 210 is rotated, even if the first limiting portion 211 is located between the two limiting points, the supporting portion can ensure that the upper disc 210 will not fall off.

[0049] The abutting portion 212 and the supporting portion can have various states, for example, the abutting portion 212 can be provided as an external thread arranged along the outer circumferential side surface of the upper disc 210, and the supporting portion is provided as an internal thread matched with the external thread in the first accommodating cavity 120; in addition, the abutting portion 212 can also be a protrusion, and the supporting portion is a groove matched with the protrusion.

[0050] In the embodiment, the middle section of the clamping line 230 is provided with a plurality of protrusions to increase the friction between the contact position of the clamping line 230 and the drainage tube, improve the clamping and fixing effect of the drainage tube, and prevent the drainage tube from sliding in the channel.

[0051] In the embodiment, the side surface of the upper disc 210 is provided with a rotation scale line, and the first limiting portion 211 is located at the scale line.

[0052] The remaining working principles and effects of the embodiment are consistent with those of embodiment 1.

[0053] Embodiment 3

[0054] An embodiment 3 of the skull plug for fixing the drainage tube, based on embodiment 1 or embodiment 2, the difference is that, as shown, Figure 2 The lower disc 220 is provided with a second limiting portion 221, and the second limiting portion 221 is used to limit the rotation of the lower disc 220 in the second accommodating cavity 130.

[0055] In the embodiment, the second limiting portion 221 is a plurality of protrusions arranged on the outer side surface of the lower disc 220, and the kit 100 is provided with a groove matched with the protrusions at the second accommodating cavity 130, and the second limiting portion 221 is arranged in the groove to limit the rotation of the lower disc 220 relative to the kit 100.

[0056] The other technical features, working principles and effects of the embodiment are consistent with those of embodiment 1 or embodiment 2.

[0057] 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. Based on the above description, any other different forms of changes or variations can be made by those skilled in the art. Here, it is not necessary and impossible to enumerate all the embodiments. Any modification, equivalent replacement and improvement made 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 skull plug for securing a drain, the skull plug comprising: The skull plug comprises a sleeve (100) and an insert (200) installed in the sleeve (100), the insert (200) is provided with a channel for passing a drainage tube; the insert (200) comprises an upper disc (210), a lower disc (220) and a plurality of clamping lines (230) connecting the upper disc (210) and the lower disc (220), the clamping lines (230) are used for fixing the drainage tube, the clamping lines (230) have an elastic deformation amount; the upper disc (210) is located at an upper end of the sleeve (100) and is rotatable relative to the sleeve (100), and the lower disc (220) is fixedly connected with a lower end of the sleeve (100). By rotating the upper disc (210) relative to the sleeve (100), the minimum distance between the clamping lines (230) and the central axis of the insert (200) gradually decreases, thereby fixing the drainage tube with different diameters.

2. The skull plug for securing a drain according to claim 1, wherein, The upper disc (210) and the lower disc (220) are both provided with through holes, and the through holes and the area surrounded by the plurality of clamping lines (230) form a channel for passing the drainage tube.

3. The skull plug for securing a drain according to claim 1, wherein, The sleeve (100) is provided with a cavity (110) penetrating the sleeve (100) in an axial direction, one end of the cavity (110) is provided with a first accommodating cavity (120), and the other end of the cavity (110) is provided with a second accommodating cavity (130); the upper disc (210) is located in the first accommodating cavity (120) and is rotatable relative to the sleeve (100), the upper disc (210) is provided with a first limiting portion (211), and the first limiting portion (211) is used for limiting the position of the upper disc (210) in the first accommodating cavity (120); and the lower disc (220) is located in the second accommodating cavity (130) and is fixedly connected with the sleeve (100).

4. The skull plug for securing a drain according to claim 3, wherein, The lower disc (220) is detachably connected with the sleeve (100), and the lower disc (220) is provided with a second limiting portion (221), and the second limiting portion (221) is used for limiting the rotation of the lower disc (220) in the second accommodating cavity (130).

5. The skull plug for securing a drain according to claim 1, wherein, An initial length of the clamping line (230) is greater than or equal to the distance between the upper disc (210) and the lower disc (220).

6. The skull plug for securing a drain according to claim 1, wherein, The clamping line (230) has a circular cross section, and a breaking elongation of the clamping line (230) is greater than 10%; and / or, the clamping line (230) is made of a polyether ether ketone material.

7. The skull plug for securing a drain according to claim 1, wherein, The clamping lines (230) are equidistantly distributed along a circumferential direction of the upper disc (210); and / or, a middle segment of the clamping line (230) is provided with a plurality of protrusions.

8. The skull plug for securing a drain according to claim 3, wherein, The first limiting portion (211) is a pawl, and a recess (140) matched with the pawl is arranged in the first accommodating cavity (120).

9. The skull plug for securing a drain according to claim 8, wherein, The inner side of the recess (140) comprises a limiting surface (141) for limiting reverse rotation of the pawl and a matching surface (142) for forward rotation of the pawl, the included angle between the limiting surface (141) and the inner profile surface of the first accommodating cavity (120) is 100-120°, and the included angle between the matching surface (142) and the inner profile surface of the first accommodating cavity (120) is 140-160°.

10. The skull plug for securing a drain according to claim 3, wherein, The upper disc (210) is provided with an abutting portion (212), and the first accommodating cavity (120) is provided with a supporting portion, the bottom surface of the abutting portion (212) is attached to the top surface of the supporting portion.

11. The skull plug for securing a drain according to claim 1, wherein, A tool connecting groove (213) for inserting a tool is arranged on the top surface of the upper disc (210).

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