Fixing device

Abstract

The utility model discloses a fixing device which comprises a guide screw, the guide screw is internally provided with a first hollow channel arranged in the axial direction of the guide screw in a penetrating mode, and the first hollow channel is used for allowing an imbedded instrument to penetrate through. The first end of the guide screw comprises a reducing section, the reducing section comprises a first side and a second side, the first side and the second side are arranged at intervals in the axial direction of the guide screw, the first side is located on the end face of the first end, the outer diameter of the reducing section is gradually reduced in the direction from the second side to the first side, and a first external thread is further arranged on the peripheral wall of the first end. According to the technical scheme, the guide screw can be accurately positioned with the head of the patient, and under the guide matching of the gradually-shrinking section and the skull hole, the guide screw can be conveniently implanted into the skull of the patient through the first external thread.

Description

Technical Field

[0001] This application relates to the field of medical device technology, and in particular to a fixation device. Background Technology

[0002] An implantable medical device is a device inserted into the body to diagnose and / or treat lesions. When doctors use implantable devices to diagnose and treat a patient's head, especially when diagnosing and treating the inside of the skull, the implantable device needs to be fixed to the patient's head.

[0003] To prevent unnecessary movement of the implanted device in the patient's head, a fixation device is usually used to secure it to the patient's head. The implanted device is then passed through the hollow channel of the fixation device, and finally, the implanted device is fixed to the fixation device, thereby achieving the purpose of stably fixing the implanted device to the patient's head.

[0004] In related technologies, fixation devices include guide screws, which have a hollow channel extending through them along their axial direction and external threads at one end to fix the guide screw to the patient's head. However, the end of the guide screw does not have a structure for positioning and guiding with the patient's skull, making it difficult for the external threads of the guide screw to be implanted into the patient's skull, which significantly increases the time required for diagnosis and / or treatment. Utility Model Content

[0005] The main objective of this application is to provide a fixation device that improves upon the problem in existing fixation devices where the end of the guide screw lacks a structure for positioning and guiding with the patient's skull, making it difficult to implant the external thread of the guide screw into the patient's skull.

[0006] To achieve the above objectives, the present application proposes a fixation device, which includes a guide screw, the interior of which has a first hollow channel extending through it along its axial direction, the first hollow channel being used for the insertion of an instrument.

[0007] The first end of the guide screw includes a tapered section, which includes a first side and a second side. The first side and the second side are spaced apart in the axial direction of the guide screw. The first side is located on the end face of the first end. The outer diameter of the tapered section gradually decreases along the direction from the second side to the first side. The peripheral wall of the first end is also provided with a first external thread.

[0008] In some embodiments of this application, the length of the tapered section in the axial direction of the guide screw is 0.17 to 0.27 times the length of the first external thread in the axial direction of the guide screw.

[0009] In some embodiments of this application, the first end of the guide screw further includes a flat section and a tapering section, wherein the tapering section, the flat section, and the tapering section are sequentially connected.

[0010] The expanding section includes a third side and a fourth side, which are spaced apart axially from the guide screw. The fourth side is the side of the expanding section away from the flat section, and the outer diameter of the expanding section gradually increases from the third side to the fourth side.

[0011] In some embodiments of this application, the guide screw further includes a second end disposed opposite to the first end, the peripheral wall of the second end being provided with a second external thread, the pitch of the second external thread being less than the pitch of the first external thread.

[0012] In some embodiments of this application, the first hollow channel is sequentially divided into a first port segment, a straight segment, and a second port segment along the axial direction of the guide screw. The outlet of the first port segment is located on the side away from the straight segment, and the inlet of the second port segment is located on the side away from the straight segment.

[0013] The outlet of the first port segment and the inlet of the second port segment are both flared.

[0014] In some embodiments of this application, the guide screw is further provided with a first operating part, the first operating part including at least two abutting surfaces, the at least two abutting surfaces being arranged circumferentially spaced along the guide screw, and each abutting surface being parallel to the axial direction of the guide screw.

[0015] In some embodiments of this application, the guide screw further includes a second end disposed opposite to the first end, the peripheral wall of the second end being provided with a second external thread, the pitch of the second external thread being less than the pitch of the first external thread.

[0016] In some embodiments of this application, a prism is provided on the side of the second end away from the first end, and at least two abutting surfaces are provided on the periphery of the prism.

[0017] In some embodiments of this application, a cylinder protrudes from the side of the second end away from the first end, and a cross groove is provided on the side of the cylinder away from the second end.

[0018] In some embodiments of this application, the fixing device further includes a locking post and a first sealing element. The locking post is provided with a connecting channel through the circumference of the guide screw. The peripheral wall of the connecting channel is provided with a third internal thread, a transition arc surface and a through hole in sequence along the axial direction of the guide screw.

[0019] The first seal is housed in the connecting channel and abuts against the transition arc surface. The third internal thread is threadedly connected to the second external thread to compress the first seal.

[0020] In some embodiments of this application, the guide screw further includes a third end disposed opposite to the first end, the third end having a connecting portion having a mounting hole, and the mounting hole communicating with the first hollow channel, the wall of the mounting hole having a fourth internal thread;

[0021] The fixing device further includes a second seal and a nut. The second seal has a second hollow channel extending through the axial direction of the guide screw and is housed in the mounting hole. The nut has a third hollow channel extending through the axial direction of the guide screw and is threadedly connected to the fourth internal thread to compress the second seal. The first hollow channel, the second hollow channel, and the third hollow channel are all coaxially arranged.

[0022] In some embodiments of this application, the diameter of the mounting hole is larger than the diameter of the first hollow channel to form an annular stepped surface at the connection between the mounting hole and the first hollow channel, and the second seal abuts against the stepped surface to restrict the second seal from entering the first hollow channel.

[0023] In some embodiments of this application, the nut is provided with a second operating portion on its periphery. The second operating portion includes at least two operating plates, which are spaced apart along the periphery of the nut, and each operating plate extends radially along the nut.

[0024] In some embodiments of this application, the fixing device further includes a sealing plug, which is threadedly connected to the fourth internal thread to seal the first hollow channel;

[0025] And / or, the periphery of the connecting portion is provided with at least two abutting surfaces.

[0026] The fixation device provided in this application, through the above-described structural configuration, has a guide screw whose outer diameter gradually decreases from the second side to the first side, thus forming a positioning and guiding structure at the end of the guide screw. Therefore, when the guide screw is implanted into the patient's skull, the tapered section can be used to position and cooperate with the cranial foramen on the patient's skull, so that the guide screw and the patient's head are precisely positioned. With the guidance cooperation between the tapered section and the cranial foramen, the guide screw can be easily implanted into the patient's skull through the first external thread, thereby shortening the time for diagnosis and / or treatment. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of one embodiment of the guide screw in the fixing device of this application;

[0029] Figure 2 for Figure 1 A cross-sectional view of the guide screw;

[0030] Figure 3 for Figure 2 A magnified view of a section at point A in the middle;

[0031] Figure 4 This is a schematic diagram of another embodiment of the guide screw in the fixing device of this application;

[0032] Figure 5 for Figure 4 Partial sectional view of the guide screw and locking post during assembly;

[0033] Figure 6 This is an exploded view of yet another embodiment of the fixing device of this application;

[0034] Figure 7 for Figure 6 A sectional view of the fixing device in the middle;

[0035] Figure 8 for Figure 7 A magnified view of a section at point B in the middle;

[0036] Figure 9 for Figure 6 Schematic diagram of the structure of the middle nut;

[0037] Figure 10 This is an exploded view of another embodiment of the fixing device of this application;

[0038] Figure 11 for Figure 10 A sectional view of the fixing device in the middle;

[0039] Figure 12 for Figure 11 A magnified view of a section at point C.

[0040] Explanation of icon numbers:

[0041] 100. Fixing device; 10. Guide screw; 11. First hollow channel; 111. First port section; 112. Straight section; 113. Second port section; 12. First end; 121. Retracting section; 122. Flat section; 123. Expanding section; 124. First external thread; 13. Second end; 131. Second external thread; 14. Third end; 141. Connecting part; 142. Mounting hole; 143. Fourth internal thread; 15. First operating part; 16. Prism; 17. Cylinder; 171. Cross groove; 20. Second seal; 21. Second hollow channel; 30. Nut; 31. Third hollow channel; 32. Second operating part; 40. Sealing plug; 41. Insertion section; 42. Third operating part; 50. Locking post; 51. Third internal thread; 52. Transition arc surface; 53. Through hole; 60. First seal.

[0042] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0043] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0044] In this application, unless otherwise expressly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0045] Furthermore, the use of terms such as "first" and "second" in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. If the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed in this application.

[0046] An implantable medical device is a device inserted into the body to diagnose and / or treat lesions. To prevent unnecessary movement of the implantable device in the patient's head, a fixation device is usually used to secure it to the patient's head. The implantable device is then passed through the hollow channel of the fixation device, and finally, the implantable device is fixed to the fixation device, thereby achieving the purpose of stably fixing the implantable device in the patient's head.

[0047] In related technologies, fixation devices include guide screws, which have a hollow channel extending through them along their axial direction and external threads at one end to fix the guide screw to the patient's head. However, the end of the guide screw does not have a structure for positioning and guiding with the patient's skull, making it difficult for the external threads of the guide screw to be implanted into the patient's skull, which significantly increases the time required for diagnosis and / or treatment.

[0048] This application provides a fixation device 100 for fixing implanted devices. To facilitate the implantation of the guide screw 10 of the fixation device 100 into the patient's skull, and to fix the implanted device using the fixation device 100, this application improves the fixation device 100. Please refer to the reference... Figures 1 to 8 In an embodiment of this application, the fixing device 100 includes a guide screw 10, the interior of which has a first hollow channel 11 extending through it along its axial direction, the first hollow channel 11 being used for the insertion of an instrument.

[0049] The guide screw 10 is generally cylindrical, but it can be made into other shapes depending on the actual needs. The guide screw 10 is preferably made of titanium alloy or other polymer materials with good biocompatibility.

[0050] The implanted device includes, but is not limited to, electrodes or fiber optic conduits. When the guide screw 10 is fixed to the patient's skull, the electrodes or fiber optic conduits can pass through the first hollow channel 11 into the patient's skull and reach the predetermined area. They can then be fixed to the guide screw 10 by other auxiliary parts (e.g., nuts), thereby completing the fixation of the implanted device on the skull.

[0051] The first end 12 of the guide screw 10 includes a tapered section 121, which includes a first side and a second side. The first side and the second side are spaced apart in the axial direction of the guide screw 10. The first side is located on the end face of the first end 12. The outer diameter of the tapered section 121 is gradually reduced along the direction from the second side to the first side. The peripheral wall of the first end 12 is also provided with a first external thread 124.

[0052] It is understandable that the first side is located on the end face of the first end 12 so that the position of minimum diameter of the tapered section 121 is located on the end face of the first end 12. The length of the tapered section 121 is the distance from the first side to the second side, that is, the distance from the end face of the first end 12 along the axial direction of the guide screw 10 to the second side.

[0053] The outer diameter of the tapered section 121 gradually decreases along the direction from the second side to the first side, meaning that the outer diameter of the tapered section 121 changes regularly along the direction from the second side to the first side, and this change is a gradual decrease. It should be emphasized that the first external thread 124 is provided on the peripheral wall of the first end 12, and the first end 12 includes the tapered section 121, that is, the tapered section 121 also has the first external thread 124, and the outer diameter of the external thread on the tapered section 121 also gradually decreases with the outer diameter of the tapered section 121. The outer diameter of the external thread refers to the diameter of the imaginary cylinder that coincides with the crest of the external thread.

[0054] It should be noted that before the guide screw 10 is implanted into the patient's skull, it is usually necessary to make a hole in the patient's skull, i.e., a cranial foramen, so that the guide screw 10 can be implanted into the patient's skull using the first external thread 124 on the guide screw 10.

[0055] The fixation device 100 provided in this application, through the above-described structural configuration, has a gradually decreasing outer diameter of the tapered section 121 of its guide screw 10 along the direction from the second side to the first side, which forms a positioning and guiding structure at the end of the guide screw 10. Therefore, when the guide screw 10 is implanted into the patient's skull, the tapered section 121 can be used to position and cooperate with the cranial foramen on the patient's skull, so that the guide screw 10 and the patient's head are precisely positioned. With the guiding cooperation between the tapered section 121 and the cranial foramen, the guide screw 10 can be easily implanted into the patient's skull through the first external thread 124, thereby shortening the time for diagnosis and / or treatment.

[0056] In some examples, the minimum diameter of the first hollow channel 11 of the guide screw 10 is 0.04-0.09 mm larger than the maximum outer diameter of the implanted device. This setting can ensure that the implanted device passes smoothly through the first hollow channel 11 and prevent the implanted device from shaking significantly, ensuring that the implanted device can accurately reach the predetermined area. Preferably, the minimum diameter of the first hollow channel 11 is 1.3 mm.

[0057] In some examples, such as Figure 3As shown, the length of the tapered section 121 in the axial direction of the guide screw 10 is 0.17 to 0.27 times the length of the first external thread 124 in the axial direction of the guide screw 10. This configuration aims to optimize the specific structure of the first external thread 124 of the guide screw 10, making it easier for the guide screw 10 to be implanted into the patient's skull using the first external thread 124, while ensuring the reliability of the connection between the first external thread 124 and the patient's skull by limiting the relationship between the length of the tapered section 121 and the length of the first external thread 124.

[0058] In some preferred examples, the length of the tapered section 121 in the axial direction of the guide screw 10 is 0.22 times the length of the first external thread 124 in the axial direction of the guide screw 10.

[0059] In some examples, such as Figures 1 to 3 As shown, the first end 12 of the guide screw 10 also includes a flattening section 122 and a tapering section 123, which are sequentially connected. The tapering section 123, the flattening section 122, and the tapering section 121 are connected in sequence. The tapering section 123 includes a third side and a fourth side, which are spaced apart in the axial direction of the guide screw 10. The fourth side is the side of the tapering section 123 away from the flattening section 122. The outer diameter of the tapering section 123 gradually increases from the third side to the fourth side.

[0060] It should be noted that the guide screw 10 is usually made into a blank using a one-piece molding process, and then the tapered section 121 and the first external thread 124 are obtained by machining (e.g., turning, milling, drilling). The aforementioned expanding section 123, flattening section 122 and tapered section 121 are divided sequentially, and there are no obvious connection marks (e.g., welds) between the expanding section 123, flattening section 122 and tapered section 121.

[0061] With this design, during the implantation of the guide screw 10 into the patient's skull, if the dilatation segment 123 comes into contact with the skull, the implantation resistance of the guide screw 10 will increase, requiring greater force to rotate it. This allows the operator to quickly perceive that the guide screw 10 has been implanted to the predetermined depth, thus stopping the operation and preventing the guide screw 10 from being over-implanted into the patient's head, thereby avoiding unnecessary damage to the patient. This application also features a smooth transition between the third and fourth sides, avoiding sharp edges or abrupt changes in traditional designs, further reducing potential damage to the skull and surrounding tissues.

[0062] In some examples, the length of the tapered section 121 in the axial direction of the guide screw 10 is 0.9 to 1.1 times the length of the expanding section 123 in the axial direction of the guide screw 10. This arrangement aims to further optimize the specific structure of the first end 12 of the guide screw 10, so as to improve the stability of the guide screw 10 when it is fixed in the patient's skull while facilitating its implantation.

[0063] In some preferred examples, the length of the tapered section 121 in the axial direction of the guide screw 10 is equal to the length of the expanding section 123 in the axial direction of the guide screw 10.

[0064] In some examples, such as Figures 1 to 3 As shown, the first hollow channel 11 is divided into a first port section 111, a straight section 112 and a second port section 113 along the axial direction of the guide screw 10. The outlet of the first port section 111 is located on the side away from the straight section 112, and the inlet of the second port section 113 is located on the side away from the straight section 112. The outlet of the first port section 111 and the inlet of the second port section 113 are both flared.

[0065] Understandably, when the implanted device penetrates the first hollow channel 11 into the patient's skull, it first enters the first hollow channel 11 through the side of the second port segment 113 away from the straight segment 112. Therefore, this side is defined as the inlet of the second port segment 113. Of course, after diagnosis and / or treatment, the implanted device can exit the first hollow channel 11 through the inlet of the second port segment 113. Similarly, within the straight segment 112, the implanted device needs to enter the patient's head through the side of the first port segment 111 away from the straight segment 112. Therefore, this side is defined as the outlet of the first port segment 111. After diagnosis and / or treatment, the implanted device can retract into the first hollow channel 11 through the outlet of the first port segment 111 to exit the patient's head.

[0066] This design, by flaring out the outlet of the first port segment 111 and the inlet of the second port segment 113, allows the implanted device sufficient space to move between the first port segment 111 and the second port segment 113 when inserted into the first hollow channel 11. This reduces friction between the implanted device and both ends of the first hollow channel 11, preventing damage from friction and thus extending the device's lifespan. Simultaneously, it makes the insertion / exit of the device into and out of the first hollow channel 11 smoother, preventing jamming and operator misjudgment, and improving the operator's control over the implanted device.

[0067] In some examples, such as Figure 1 and Figure 10As shown, the guide screw 10 is also provided with a first operating part 15, which includes at least two abutting surfaces. The at least two abutting surfaces are arranged at intervals along the circumference of the guide screw 10, and each abutting surface is parallel to the axial direction of the guide screw 10.

[0068] This design is intended to facilitate the operator in applying torque and force to the guide screw 10 through the first operating part 15, while also preventing the operator from slipping their hand during operation.

[0069] In some examples, such as Figure 1 As shown, the guide screw 10 also includes a second end 13 disposed opposite to the first end 12. The peripheral wall of the second end 13 is provided with a second external thread 131, and the pitch of the second external thread 131 is less than the pitch of the first external thread 124.

[0070] It should be noted that the first external thread 124 is used for fixing at the cranial foramen of the skull, and the second external thread 131 is used to mate with a nut or the like to fix the insertion device passing through the guide screw 10 onto the guide screw 10. In some examples, the pitch of the first external thread 124 ranges from 0.6 to 0.8 mm, and the preferred pitch of the first external thread 124 is 0.7 mm.

[0071] This design is intended to facilitate the fixation of the implanted device onto the guide screw 10, while also allowing the operator to clearly distinguish the first end 12 and the second end 13 of the guide screw 10 by visual observation and / or touch, so as to avoid the second external thread 131 of the second end 13 from engaging with the cranial foramen.

[0072] In some examples, such as Figure 1 As shown, a prism 16 protrudes from the side of the second end 13 away from the first end 12, and at least two abutting surfaces are provided on the periphery of the prism 16. It should be emphasized that the at least two abutting surfaces on the prism 16 can form the first operating part 15 mentioned above, but it is not limited to the first operating part 15 including only the abutting surfaces on the prism 16. The first operating part 15 may also include abutting surfaces provided on other parts of the guide screw 10.

[0073] In some examples, such as Figure 4 As shown, a cylinder 17 protrudes from the side of the second end 13 away from the first end 12, and a cross groove 171 is provided on the side of the cylinder 17 away from the second end 13. With this configuration, the operator can also use a tool to operate the guide screw 10 by engaging the cross groove 171.

[0074] In some examples, such as Figure 5As shown, the fixing device 100 also includes a locking pin 50 and a first sealing member 60. The locking pin 50 has a connecting channel extending through it along the circumference of the guide screw 10. The peripheral wall of the connecting channel has a third internal thread 51, a transition arc surface 52, and a through hole 53 sequentially arranged along the axial direction of the guide screw 10. The first sealing member 60 is accommodated in the connecting channel and abuts against the transition arc surface 52. The third internal thread 51 is threadedly connected to the second external thread 131 to compress the first sealing member 60.

[0075] This design aims to compress the first seal 60 by connecting the third internal thread 51 with the second external thread 131, causing the first seal 60 to deform under pressure. This deformation, in turn, engages with the implanted device and the transition arc surface 52 to compress and fix the implanted device, thereby securing it to the patient's head using the fixation device 100. Simultaneously, the transition arc surface 52 reduces stress concentration, preventing damage to the locking post 50.

[0076] In some examples, such as Figures 6 to 8 As shown, the guide screw 10 also includes a third end 14 disposed opposite to the first end 12. The third end 14 is provided with a connecting portion 141 having a mounting hole 142, and the mounting hole 142 is connected to the first hollow channel 11. The wall of the mounting hole 142 is provided with a fourth internal thread 143. The fixing device 100 also includes a second seal 20 and a nut 30. The second seal 20 is provided with a second hollow channel 21 through the axial direction of the guide screw 10 and is housed in the mounting hole 142. The nut 30 is provided with a third hollow channel 31 through the axial direction of the guide screw 10 and is threadedly connected to the fourth internal thread 143 to compress the second seal 20. The first hollow channel 11, the second hollow channel 21, and the third hollow channel 31 are all coaxially disposed.

[0077] It should be noted that in this example, when the implantation device is inserted into the patient's head, it needs to pass through the third hollow channel 31, the second hollow channel 21 and the first hollow channel 11 in sequence. When the implantation device is withdrawn from the patient's head and detached from the fixation device 100, it needs to withdraw from the first hollow channel 11, the second hollow channel 21 and the third hollow channel 31 in sequence.

[0078] This design aims to compress the second seal 20 by connecting the nut 30 to the fourth internal thread 143, causing the second seal 20 to deform under pressure. This deformation, combined with the engagement of the second seal 20 with the implanted device and the mounting hole 142, secures the implanted device, thereby achieving the purpose of fixing the implanted device to the patient's head via the fixation device 100. Simultaneously, the deformation of the second seal 20 also seals the guide screw 10.

[0079] In conjunction with the above-mentioned first operating part 15, in this example, the connecting part 141 has at least two abutting surfaces on its periphery, forming the aforementioned first operating part 15.

[0080] In some examples, the third hollow channel 31 is flared on the side away from the second hollow channel 21 to facilitate the insertion of instruments into the third hollow channel 31.

[0081] In some examples, such as Figure 7 and Figure 8 As shown, the diameter of the mounting hole 142 is larger than the diameter of the first hollow channel 11, so as to form an annular stepped surface at the connection between the mounting hole 142 and the first hollow channel 11. The second seal 20 abuts against the stepped surface to restrict the second seal 20 from entering the first hollow channel 11.

[0082] This design aims to prevent the second seal 20 from being subjected to excessive force and entering the first hollow channel 11, and the stepped surface can better support the second seal 20, thereby improving the reliability of the second seal 20 in fixing the inserted instrument and the sealing performance of the guide screw 10.

[0083] In some examples, such as Figure 9 As shown, a second operating part 32 is provided on the periphery of the nut 30. The second operating part 32 includes at least two operating pieces. The at least two operating pieces are arranged at intervals along the periphery of the nut 30, and each operating piece extends radially along the nut 30.

[0084] With this configuration, in certain situations, the operator does not need to use other auxiliary tools and can operate the nut 30 simply by holding the second operating part 32 with their hand, which improves the operator's efficiency and convenience in operating the nut 30.

[0085] In some examples, such as Figures 10 to 12 As shown, the fixation device 100 also includes a sealing plug 40, which is threadedly connected to a fourth internal thread 143 to seal the first hollow channel 11. This arrangement is intended to prevent cerebrospinal fluid leakage along the first hollow channel 11 after the inserted device is withdrawn from the patient's head by sealing the first hollow channel 11 with the sealing plug 40.

[0086] In some examples, such as Figures 10 to 12 As shown, the sealing plug 40 also has a plug section 41 extending along its axial direction. When the sealing plug 40 is threadedly connected to the fourth internal thread 143, the plug section 41 is accommodated in the first hollow channel 11 to avoid or reduce the leakage of cerebrospinal fluid into the first hollow channel 11.

[0087] Understandably, in some application scenarios, after the inserted device is removed from the first hollow channel 11, the nut 30 is unscrewed, leaving the second seal 20 inside the mounting hole 142. The sealing plug 40 is threadedly connected to the fourth internal thread 143, and the second seal 20 is squeezed, causing the second seal 20 to deform under force. The deformation of the second seal 20, in conjunction with the insertion section 41 and the mounting hole 142, can improve the sealing performance of the guide screw 10.

[0088] In some examples, such as Figures 10 to 12 As shown, a third operating part 42 is also provided on the side of the sealing plug 40 away from the guide screw 10, so that the operator can operate the sealing plug 40 using the third operating part 42. The specific structure of the third operating part 42 can be referred to the first operating part 15 and the second operating part 32 described above.

[0089] The above description is merely an optional embodiment of this application and does not limit the patent scope of this application. Any equivalent structural transformations made based on the inventive concept of this application and the contents of the specification and drawings of this application, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this application.

Claims

1. A fixing device, characterized in that, Includes a guide screw, the guide screw having a first hollow channel extending through it along its axial direction, the first hollow channel being for the insertion of an instrument to pass through; The first end of the guide screw includes a tapered section, which includes a first side and a second side. The first side and the second side are spaced apart in the axial direction of the guide screw. The first side is located on the end face of the first end. The outer diameter of the tapered section gradually decreases along the direction from the second side to the first side. The peripheral wall of the first end is also provided with a first external thread.

2. The fixing device as described in claim 1, characterized in that, The length of the tapered section in the axial direction of the guide screw is 0.17 to 0.27 times the length of the first external thread in the axial direction of the guide screw.

3. The fixing device as described in claim 1, characterized in that, The first end of the guide screw further includes a flat section and a gradually expanding section, wherein the gradually expanding section, the flat section, and the gradually contracting section are sequentially connected. The expanding section includes a third side and a fourth side, which are spaced apart axially from the guide screw. The fourth side is the side of the expanding section away from the flat section, and the outer diameter of the expanding section gradually increases from the third side to the fourth side.

4. The fixing device as described in claim 1, characterized in that, The first hollow channel is divided into a first port segment, a straight segment and a second port segment along the axial direction of the guide screw. The outlet of the first port segment is located on the side away from the straight segment, and the inlet of the second port segment is located on the side away from the straight segment. The outlet of the first port segment and the inlet of the second port segment are both flared.

5. The fixing device as described in claim 1, characterized in that, The guide screw is further provided with a first operating part, the first operating part including at least two abutting surfaces, the at least two abutting surfaces being arranged circumferentially on the guide screw, and each abutting surface being parallel to the axial direction of the guide screw.

6. The fixing device as described in claim 5, characterized in that, The guide screw also includes a second end disposed opposite to the first end, the peripheral wall of the second end being provided with a second external thread, the pitch of the second external thread being less than the pitch of the first external thread.

7. The fixing device as described in claim 6, characterized in that, The second end has a prism protruding on the side away from the first end, and the prism has at least two abutting surfaces on its periphery.

8. The fixing device as described in claim 6, characterized in that, A cylinder protrudes from the side of the second end away from the first end, and a cross groove is provided on the side of the cylinder away from the second end.

9. The fixing device as described in claim 6, characterized in that, The fixing device further includes a locking pin and a first sealing element. The locking pin has a connecting channel extending through the circumference of the guide screw. The peripheral wall of the connecting channel has a third internal thread, a transition arc surface and a through hole sequentially arranged along the axial direction of the guide screw. The first seal is housed in the connecting channel and abuts against the transition arc surface. The third internal thread is threadedly connected to the second external thread to compress the first seal.

10. The fixing device as described in claim 5, characterized in that, The guide screw also includes a third end disposed opposite to the first end. The third end is provided with a connecting part having a mounting hole, and the mounting hole is connected to the first hollow channel. The wall of the mounting hole is provided with a fourth internal thread. The fixing device further includes a second seal and a nut. The second seal has a second hollow channel extending through the axial direction of the guide screw and is housed in the mounting hole. The nut has a third hollow channel extending through the axial direction of the guide screw and is threadedly connected to the fourth internal thread to compress the second seal. The first hollow channel, the second hollow channel, and the third hollow channel are all coaxially arranged.

11. The fixing device as claimed in claim 10, characterized in that, The diameter of the mounting hole is larger than the diameter of the first hollow channel, so as to form an annular stepped surface at the connection between the mounting hole and the first hollow channel. The second seal abuts against the stepped surface to restrict the second seal from entering the first hollow channel.

12. The fixing device as claimed in claim 10, characterized in that, The nut has a second operating part on its periphery. The second operating part includes at least two operating plates. The at least two operating plates are spaced apart along the periphery of the nut, and each operating plate extends radially along the nut.

13. The fixing device as claimed in claim 10, characterized in that, The fixing device further includes a sealing plug, which is threadedly connected to the fourth internal thread to seal the first hollow channel; And / or, the periphery of the connecting portion is provided with at least two abutting surfaces.

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