CN210582605U - Skull bone flap fixing device and mounting tool thereof - Google Patents

Abstract

The mounting tool comprises a driving part, a loading part and an over-torque protection mechanism arranged between the driving part and the loading part, wherein the driving part drives the loading part to rotate through the over-torque protection mechanism, the loading part is used for screwing the skull bone flap fixing device, and when the torque of the driving part acting on the over-torque protection mechanism is larger than a threshold value, the over-torque protection mechanism is separated from the driving part and/or the loading part. The utility model discloses not only improve mounting tool's installation and dismantlement efficiency effectively, can eliminate the potential safety hazard that the uncertainty that screws the in-process and bring by the human factor caused moreover, show the security that has improved the installation, protected skull bone lamella effectively.

Description

Skull bone flap fixing device and mounting tool thereof

Technical Field

The utility model relates to a surgical operation field, concretely relates to skull bone lamella fixing device and mounting tool thereof.

Background

The skull bone flap fixing device, also called skull lock, is a medical instrument for fixing bone flaps after craniotomy, can quickly meet the clinical fixing requirements of the bone flaps after craniotomy, has simple and convenient operation, fast rotation and firm clamping, and can effectively save the operation time.

The traditional skull bone flap fixing device comprises a connecting rod, an upper disc and a lower disc, wherein the upper disc and the lower disc are arranged on the connecting rod, and the upper disc and the connecting rod are connected through threads. In use, the upper disc is rotated to move along the connecting rod to the lower disc, and finally the upper disc and the lower disc clamp and fix the bone flap.

In the prior art, skull flap fixation devices are usually provided with a mounting tool, for example patent publication No. CN205697968U discloses a skull flap fixation device provided with a turn-lock as a mounting tool for an upper disc. The bottom end of the twistlock device is provided with a lock column, the lock column can be inserted into a connecting hole formed in the upper disc, and then the twistlock device can drive the upper disc to rotate so as to realize locking operation. The publication US7387633B2 also discloses a skull flap fixation device, the bottom end of the mounting tool of which is provided with a stud matching a guiding hole provided on the upper disc, enabling the mounting tool to tend towards rotation of the upper disc on the connecting rod by inserting the stud of the mounting tool into the guiding hole of the upper disc during use.

Although the mounting tools can remarkably simplify the screwing operation of the upper disc, a doctor cannot judge whether the upper disc is screwed in the operation, and the excessive or insufficient force of the upper disc on the skull flap can bring hidden troubles to the safety of the skull flap fixation.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a skull bone lamella fixing device and mounting tool thereof to there is the problem of hidden danger in the security that solves because the doctor can not judge directly perceivedly in the operation whether the disc screws the skull bone lamella that causes.

The utility model discloses a following technical scheme realizes:

the mounting tool of the skull bone flap fixing device comprises a driving part, a loading part and an over-torque protection mechanism arranged between the driving part and the loading part, wherein the driving part drives the loading part to rotate through the over-torque protection mechanism, the loading part is used for screwing the skull bone flap fixing device, and when the torque of the driving part acting on the over-torque protection mechanism is larger than a threshold value, the over-torque protection mechanism is separated from the driving part and/or the loading part.

In the prior art, a skull flap fixing device is generally provided with a screw fastener as an installation tool for screwing the skull flap fixing device. Although this integrated mounting tool can significantly simplify the operation of screwing the upper disc, the surgeon cannot determine whether the upper disc is screwed during the operation. When the torque applied to the mounting tool is too large, the clamping force of the upper disc on the skull flap is remarkably increased, the upper disc is difficult to disassemble if the torque is too large, and the skull flap is indented or damaged if the torque is too large; when the torque received by the mounting tool is too small, the clamping force of the upper disc on the skull flap is not enough to stably clamp the skull flap, so that the subsequent operation has safety risk. Therefore, the mounting tool can be used for fixing skull bone flaps with hidden troubles caused by overlarge or undersize torque. At present, a doctor mainly judges whether an upper disc is screwed or not by depending on experience when screwing a skull bone flap fixing device, and the main idea is to avoid the stability of clamping caused by over-small torque, so that the torque applied to an installation tool is usually large, the surface of the bone flap is inevitably abraded, or the subsequent disassembly of the upper disc is difficult, and the operation effect and efficiency are reduced. Moreover, in a high-strength skull surgery, at least three skull flap fixing devices are required to be screwed rapidly, so that a doctor needs to judge the torque of the plurality of skull flap fixing devices in a short time, and the torque applied to the plurality of skull flap fixing devices is different. Different clamping forces applied to the skull flap by the upper disks cause uneven stress on the skull flap, internal stress is easily generated, and the skull flap is damaged.

In order to solve the problems, the inventor improves the structure of the existing installation tool, the installation tool is provided with a two-section structure, and an over-torque protection mechanism is arranged in the installation tool. By this arrangement a threshold value of torque can be set, and when the torque applied to the setting tool exceeds the threshold value, the setting tool cannot continue to provide torque to the upper disc, and the clamping force of the upper disc on the skull flap reaches an upper limit.

Specifically, as in the prior art, the mounting tool of the skull flap fixing device includes a through hole penetrating through the upper end surface and the lower end surface thereof, and the mounting tool is sleeved on the connecting rod of the skull flap fixing device through the through hole so that the mounting tool can move relative to the connecting rod. Still be provided with at least one lock post on mounting tool's the lower terminal surface, the fastening hole phase-match that the lock post set up on with last disc for the lock post can with fasten the hole cooperation, and then drive the disc and rotate on the connecting rod.

Different from the prior art, the skull bone flap fixing device comprises a driving part, a loading part and an over-torque protection mechanism arranged between the driving part and the loading part, wherein the driving part is used for driving the loading part to rotate through the over-torque protection mechanism, the over-torque protection mechanism is used as a force transmission mechanism to transmit torque received by the driving part to the loading part, and the loading part is used for screwing the skull bone flap fixing device. Preferably, the driving portion and the loading portion are coaxially matched.

When the torque of the driving part acting on the over-torque protection mechanism is smaller than or equal to the threshold value, the driving part drives the loading part to synchronously rotate through the over-torque protection mechanism, the installation tool is in a driving state, and the torque applied to the driving part can be transmitted to the loading part through the over-torque protection mechanism. When the torque of the driving part acting on the over-torque protection mechanism is larger than the threshold value, the over-torque protection mechanism is separated from the driving part and/or the loading part, the installation tool is in a failure state, and the torque applied to the driving part cannot be transmitted to the loading part through the over-torque protection mechanism.

The working principle of the mounting tool is as follows: when the clamping force of the upper disc to the skull bone flap reaches an upper limit value, the torque is larger than the threshold value due to the fact that the driving part is continuously rotated, the installation tool is switched from a driving state to a failure state, and on one hand, the clamping force of the upper disc to the skull bone flap cannot be continuously increased; on the other hand, the reaction force of the driving part on the doctor hand drops suddenly, the driving part slips, and the slipping phenomenon can intuitively and quickly remind the doctor that the torque reaches the threshold value.

The threshold value of the over-torque protection mechanism corresponds to the upper limit value of the clamping force of the upper disc on the skull flap. The threshold value range can be determined by the connection strength of the over-torque protection mechanism with the driving part and the loading part, the strength, the hardness and the size position of the over-torque protection mechanism, and meanwhile, the threshold value range also depends on the influence factors such as materials, force arms, the size of the thin column, the processing technology and the like. To this end, over-torque protection mechanisms with different thresholds may be provided for different skull bone flaps so that the physician knows the amount of clamping force applied to the skull bone flap prior to fixation. For example, for a low stiffness skull flap, the threshold value of the over-torque protection mechanism can cause the upper disc to provide a clamping force of less than or equal to 40N to the skull flap. The clamping force of 20-50N is provided for the skull bone flap with high hardness in order to avoid the difficulty in disassembly.

Through the structure, in the process of installing the skull bone flap fixing device, a doctor can apply accurate clamping force to the plurality of skull bone flap fixing devices in a short time by applying the torque exceeding a threshold value without judging the torque, so that the skull bone flaps are subjected to consistent clamping force of the upper disks, the installing and disassembling efficiency of an installing tool is effectively improved, potential safety hazards caused by uncertainty caused by human factors in the screwing process can be eliminated, the safety of the installing process is remarkably improved, and the skull bone flaps are effectively protected; in addition, different threshold values are set, so that the mounting mechanism can be applied to skull bone flaps with different hardness, a doctor can select a mounting tool with a proper threshold value before an operation, and the clamping stability is further improved.

As a preferred embodiment of the invention, the mounting tool can be continuously switched between the driving state and the disabled state. The mounting tool comprises a first baffle fixed on the driving part and a second baffle fixed on the loading part, wherein the first baffle or the second baffle is used as an over-torque protection mechanism. During the use, the rotation driving portion makes first baffle contact second baffle, continues rotation driving portion and makes first baffle provide the moment of torsion and drive the rotation of second baffle to the second baffle, and mounting tool gets into drive state. When the clamping force of the upper disc on the skull bone flap reaches an upper limit value, the torque provided by the driving state cannot further rotate the loading part, the torque is increased to exceed a threshold value, so that the first baffle plate is disconnected with the second baffle plate, the first baffle plate continues to rotate, the second baffle plate is kept still, the mounting tool enters a failure state, and the over-torque protection mechanism is separated from the driving part or the loading part. After the driving part rotates for one circle, the first baffle plate is contacted with the second baffle plate again to form connection, the loading part is driven to rotate through the second baffle plate, and the mounting tool enters a driving state again. By analogy, the setting tool can be continuously switched between the driving state and the failure state to ensure that the torque does not exceed the upper limit value. Preferably, in the driving state, a lower portion of the first barrier contacts an upper portion of the second barrier. Preferably, the lower part of first baffle and the upper portion of second baffle all are provided with the wearing layer, the wearing layer not only can reduce the wearing and tearing of first baffle and second baffle, can also produce certain deformation, is favorable to first baffle and second baffle separation, and then prolongs the life of first baffle and second baffle. In this structure, the coupling strength of the first damper and the second damper determines the threshold value of the torque. In the technical scheme, the mounting tool can be repeatedly used, but a certain torque can be generated when the mounting tool enters the driving state again from the failure state every time, so that the upper disc generates impact force on the skull bone fragments.

As another preferred embodiment of the invention, the mounting tool is only capable of a limited number of switching from the drive state to the disabled state. Specifically, when the torque of the driving part acting on the over-torque protection mechanism is larger than a threshold value set by the over-torque protection mechanism, the over-torque protection mechanism is separated from the driving part and the loading part at the same time. In the technical scheme, the mounting tool comprises a third baffle fixed on the driving part and a fourth baffle fixed on the loading part, wherein the third baffle or the fourth baffle is used as an over-torque protection mechanism. During the use, the rotation driving portion makes third baffle contact fourth baffle, continues rotation driving portion and makes the third baffle provide the moment of torsion and drive the fourth baffle rotation to the fourth baffle, and mounting tool gets into drive state. When the clamping force of the upper disc on the skull bone flap reaches an upper limit value, the torque provided by the driving state cannot further rotate the loading part, the torque is increased to exceed a threshold value, so that the third baffle and the driving part are disconnected and/or the fourth baffle and the loading part are disconnected, or the third baffle is broken and/or the fourth baffle is broken, then the mounting tool enters a failure state, and the over-torque protection mechanism is separated from the driving part and the loading part at the same time. In this configuration, the lower limit values of the connection strength between the third damper and the driving portion, the connection strength between the fourth damper and the loading portion, the hardness of the third damper, and the hardness of the fourth damper determine the threshold value of the torque. In the technical scheme, the frequency of switching the installation tool from the driving state to the failure state is limited, and after all the over-torque protection mechanisms fail, the installation tool cannot be switched from the failure state to the driving state. Although the structure can not be used repeatedly, the torsion on the upper disk can not be generated after the structure is in a failure state for the last time, and the impact force of the upper disk on the skull bone fragment is avoided.

In some embodiments, the driving portion is provided with a groove which is opened upwards, the depth of the groove depends on the overall structural strength of the driving portion, and the groove is beneficial to reducing the weight of the driving portion, so that the total weight of the mounting tool is reduced.

In some embodiments, all parts of the mounting tool can be made of medical degradable or non-degradable materials such as PLA, PP, PC, PS, ABS and the like, and preferably made of PLA, the same degradable materials are adopted, so that the safety of the mounting tool is guaranteed, the total weight of the mounting tool is reduced, the visual field of a doctor is widened by the transparent driving part and the transparent loading part, and the skull surgery is facilitated.

Further, a closed accommodating cavity is formed between the driving part and the loading part, and the over-torque protection mechanism is arranged in the accommodating cavity. Under drive condition or failure state, hold the chamber and be in the enclosed condition all the time for wearing layer and baffle are located the confined chamber all the time after droing, avoid above-mentioned part to fall to the risk area, cause the influence to intracranial operation.

As a preferred embodiment of the over-torque protection mechanism of the present invention, the over-torque protection mechanism includes a thin pillar fixed on a bottom surface of the driving portion; the loading part comprises a groove with an upward opening, the groove and the bottom surface of the driving part form a closed accommodating cavity, and a blocking piece is arranged in the groove; the loading part is driven to rotate by the matching of the thin column and the blocking piece, and when the torque acted on the thin column by the driving part is larger than a threshold value, the thin column is broken off and/or falls off from the bottom surface of the driving part. In this technical scheme, the recess of loading portion and the bottom surface of drive division constitute the confined chamber that holds, it is provided with the separation blade of fixing on the recess and fixes the thin post on the drive division bottom surface to hold the intracavity, and wherein thin post is as passing moment protection mechanism and separation blade cooperation and drive the separation blade rotation. When the clamping force of the upper disc on the skull flap reaches the upper limit, the loading part stops rotating, then after the higher torque is received, the torque of the driving part acting on the thin column is larger than the threshold value, the thin column is broken and/or falls off from the bottom surface of the driving part, so that the thin column is separated from the driving part and the loading part at the same time, and the driving part slips to ensure that the upper disc cannot be in an over-tight state after being fixed firmly. In the present solution, the threshold value of the torque is related to the connection strength of the thin pillar and the driving portion and/or the strength and the hardness of the thin pillar, and preferably, the threshold value of the torque is mainly related to the hardness and the strength of the thin pillar.

Further, be provided with a plurality of separation blades in the recess, a plurality of separation blades hold the chamber with the confined and separate for a plurality of cavities, all are provided with the thin post in every cavity. In this technical scheme, hold the intracavity and be provided with a plurality of separation blades and many thin posts. The accommodating cavity is divided into a plurality of cavities by the plurality of baffle plates, and the cavities can be closed cavities or unsealed cavities. At least one thin column is arranged in each cavity, and preferably, only one thin column is arranged in each cavity. The sizes of the chambers can be the same or different, and the sizes of the chambers determine the moving distance of the thin column in the chambers, so that the rotating angle of the driving part is influenced.

In some embodiments, a first chamber and a second chamber are disposed in the groove, wherein the first chamber has a first pillar disposed therein, and the second chamber has a second pillar disposed therein. In the initial state, the distance from the first thin column to the baffle of the first cavity is equal to the distance from the second thin column to the baffle of the second cavity, and meanwhile, the hardness of the first thin column is equal to that of the second thin column. Through the arrangement, the mounting tool can only realize one-time switching from the driving state to the failure state, the screwing efficiency is higher, and meanwhile, after part of thin columns are broken due to misoperation, the mechanism avoids the situation that the mounting tool directly enters the failure state. It will be appreciated by those skilled in the art that more than two chambers and more than two thin columns may be provided according to the above arrangement to further improve fault tolerance.

In some embodiments, the distance from the first pillar to the baffle of the first chamber is smaller than the distance from the second pillar to the baffle of the second chamber, and the hardness of the first pillar is smaller than that of the second pillar. Through the arrangement, in the process of screwing the skull bone flap fixing device, the mounting tool can realize two times of switching from a driving state to a failure state, wherein a time difference exists between the first switching and the second switching, and the torque required by the second switching is larger than that required by the first switching, so that a wider threshold value range is realized. When the clamping device is used, when the clamping force of the upper disc to the skull bone flap is not enough to firmly clamp the skull bone flap after the first switching, a doctor can further increase the torque until a second threshold value is reached, so that more stable clamping force is provided for the skull bone flap in a short time, and the safety risk is reduced. It will be appreciated by those skilled in the art that more than two chambers and more than two thin posts may be provided according to the above arrangement to achieve at least more than two threshold values, further improving the versatility and accuracy of the installation tool.

In some embodiments, one blocking piece may correspond to a plurality of thin columns, and one thin column may also correspond to a plurality of blocking pieces.

The driving part and the loading part can be connected in various ways. In some embodiments, the bottom of the driving part is provided with a clamping groove, and the bottom of the loading part is provided with a clamping protrusion matched with the clamping groove, so that the loading part cannot be separated from the driving part along the direction of the central axis of the loading part, but can rotate around the central axis of the loading part.

As the utility model discloses well drive division and a preferred connected mode of loading portion, be provided with the stand pipe on the bottom surface of drive division, the stand pipe communicates the lower terminal surface of loading portion and the up end of drive division, is provided with the boss that is located loading portion below on the stand pipe, has still seted up the incision on the lateral wall of stand pipe. The guide tube runs through the whole installation tool, and the inner diameter of the guide tube is matched with the outer diameter or the thread outer diameter of the connecting rod of the skull flap fixing device, so that the installation tool can move up and down relative to the connecting rod. The loading portion is run through to the bottom of stand pipe, is provided with the boss on the outer wall of stand pipe. When the driving part and the loading part are assembled together, the boss is positioned below the loading part. Preferably, the distance between the upper surface of the boss and the bottom surface of the driving part is equal to the height of the loading part, so that in a driving state or a failure state, the accommodating cavity between the groove inside the loading part and the bottom surface of the driving part is always closed. The side wall of the guide pipe is also provided with a notch, and preferably, the notch is in an inverted triangle shape. When installation drive division and joint portion, at first aim at the stand pipe of drive division with the hole in the loading portion, and establish the loading portion cover on the stand pipe, later promote loading portion until hole and boss contact, then rotatory loading portion, align thin post and cavity, later hard to promote loading portion towards the direction of drive division, the stand pipe produces certain deformation because notched existence and makes the external diameter of boss reduce, the hole of loading portion passes through behind the boss smoothly, the boss external diameter resumes and forms the joint to the bottom of loading portion. The connection mode realizes that the accommodating cavity between the groove in the loading part and the bottom surface of the driving part is always closed in a driving state or a failure state; meanwhile, the guide pipe is used as a clamping piece, so that the overall structure of the mounting tool is simplified, the use of parts is reduced, and the total mass of the mounting tool is reduced; moreover, the loading part and the driving part are connected together all the time, so that the mounting tool is stronger in integrity and convenient to store, detach and use.

Further, the loading portion still includes the mount table, the mount table sets up on the bottom surface of loading portion, be provided with the lock post on the mount table. The mount table can further improve the stability of lock post, avoids the fracture of locking the post in the process of screwing. Preferably, the mounting table is of a hollow construction to reduce the overall mass of the mounting tool.

Furthermore, a first anti-skid part is arranged on the driving part, and a second anti-skid part is arranged on the loading part. The first anti-slip part can effectively improve the friction force on the surface of the driving part and facilitate the application of torque to the driving part. Preferably, the first anti-slip part is an anti-slip rib, which not only can improve the friction force on the surface of the driving part, but also can increase the structural strength of the driving part. When the mounting tool is in a failure state due to misoperation, as an emergency measure, a doctor can directly apply torque to the loading part through the second anti-skid part, and meanwhile, the second anti-skid part is convenient for the disassembly of the skull flap fixing device. Preferably, the second non-slip portion is a non-slip rib. Besides the anti-slip ribs, the first anti-slip part or the second anti-slip part can also adopt the prior art means such as rubber, salient points and the like to increase the friction force of the surfaces of the driving part and the loading part.

The utility model also provides a skull bone lamella fixing device, be in including connecting rod and setting last disc and lower disc on the connecting rod, it passes through threaded connection with the connecting rod to go up the disc, is provided with the fastening hole on going up the disc. The upper disc is connected with the connecting rod in a threaded manner, and the upper disc can gradually increase the clamping force on the skull flap through threaded connection; the lower disc can be fixed at the bottom of the connecting rod and can also be in threaded connection with the connecting rod, and preferably, a certain working gap exists between the inner diameter of the lower disc and the outer diameter of the connecting rod, so that the lower disc can be inclined at a certain angle relative to the horizontal plane, and the angle of the lower disc can be adaptively adjusted in the installation process to be better attached to a skull flap. The skull bone flap fixing device further comprises any one of the mounting tools, wherein a lock column is arranged at the bottom end of the mounting tool, and the size of the lock column is matched with that of the fastening hole, so that the lock column can be inserted into the fastening hole, and the mounting tool drives the upper disc to rotate around the connecting rod.

In some embodiments, the bottom surface of the upper disc is provided with a first tooth, the first tooth is a forward stop tooth, and the first tooth ensures that the upper disc can maintain sufficient pre-tightening force after the mounting tool screws the upper disc.

In some embodiments, the top surface of the lower disk has a second tooth mounted thereon, the second tooth being a fixation tooth that further improves the stability of the skull flap.

Further, the top of the connecting rod is provided with a handle, the top of the driving part is provided with a handle clamping groove, and the handle can be matched with the handle clamping groove. The handle is convenient for a doctor to hold the connecting rod, and can prevent the mounting tool from being separated from the connecting rod, so that the mounting tool is ensured to be always sleeved on the connecting rod in the skull operation process. The top of the driving part is provided with a handle clamping groove which can be matched with a handle, and in the process of skull operation, a doctor can lift and fix the mounting tool on the handle along the connecting rod according to actual requirements so as to widen the operation visual field and facilitate the doctor to observe the intracranial condition.

Compared with the prior art, the utility model, following advantage and beneficial effect have:

1. in the process of mounting the skull bone flap fixing device, a doctor can apply accurate clamping force to a plurality of skull bone flap fixing devices in a short time by applying torque exceeding a threshold value without judging the torque, so that the skull bone flaps are subjected to consistent clamping force of the upper disks, the mounting and dismounting efficiency of a mounting tool is effectively improved, potential safety hazards caused by uncertainty caused by human factors in the screwing process can be eliminated, the safety of the mounting process is remarkably improved, and the skull bone flaps are effectively protected; in addition, different threshold values are set, so that the mounting mechanism can be applied to skull bone flaps with different hardness, a doctor can select a mounting tool with a proper threshold value before an operation, and the clamping stability is further improved;

2. the mounting tool provided by the utility model can be continuously switched between the driving state and the failure state, and can only realize the limited switching from the driving state to the failure state, the former can be used repeatedly, and the latter can not generate torque to the upper disc after entering the failure state for the last time, thereby avoiding the impact force generated by the upper disc to the skull bone fragment;

3. the utility model forms a closed containing cavity between the driving part and the loading part to contain the over-torque protection mechanism, and under the driving state or the failure state, the containing cavity is always in the closed state, so that the anti-abrasion layer and the baffle are always positioned in the closed containing cavity after falling off, and the components are prevented from falling to the risk area to influence the intracranial operation;

4. the utility model discloses in the process of screwing skull bone lamella fixing device, mounting tool can realize twice from the switching of drive condition to failure state, wherein there is the time difference between first switching and the second switching, and the required moment of second switching is greater than the required moment of first switching, realize wideer threshold value scope with this, when using, when the clamping-force of last disc to the skull bone lamella after the first switching is not enough will firmly centre gripping skull bone lamella, the doctor can further increase the moment of torsion until reaching the second threshold value, and then provide stable clamping-force to the skull bone lamella in the short time, reduce the safety risk;

5. the utility model optimizes the connection mode of the driving part and the loading part, and realizes that the accommodating cavity between the groove inside the loading part and the bottom surface of the driving part is always closed in the driving state or the failure state; meanwhile, the guide pipe is used as a clamping piece, so that the structure of the mounting tool is simplified, the use of parts is reduced, and the total mass of the mounting tool is reduced; moreover, the loading part and the driving part are always connected together, so that the mounting tool is stronger in integrity and convenient to store, disassemble and use;

6. the utility model provides a skull bone lamella fixing device, it disposes any kind of mounting tool of above-mentioned, has eliminated the potential safety hazard that the uncertainty that screws the in-process and bring by the human factor caused, has showing the security that has improved the installation.

Drawings

The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:

fig. 1 is a schematic structural view of a skull flap fixing device according to embodiment 1 of the present invention;

fig. 2 is a schematic structural view of an upper section of an installation tool in embodiment 1 of the present invention;

fig. 3 is a plan view of a lower section of the installation tool according to embodiment 1 of the present invention;

fig. 4 is a schematic structural view of a lower section of an installation tool according to embodiment 2 of the present invention;

fig. 5 is a schematic structural view of an installation tool in embodiment 3 of the present invention;

fig. 6 is a schematic view of a connection relationship between the driving portion and the loading portion in embodiment 4 of the present invention.

Reference numbers and corresponding part names in the drawings:

1-connecting rod, 11-handle, 2-driving part, 21-thin column, 22-guide tube, 23-boss, 24-notch, 25-handle clamping groove, 26-first anti-slip part, 3-loading part, 31-baffle, 32-first chamber, 33-second chamber, 34-mounting table, 35-locking column, 36-second anti-slip part, 4-upper disc, 41-fastening hole, 42-first tooth, 5-lower disc, 51-second tooth, 61-first baffle, 62-second baffle, 63-anti-wear layer, 71-clamping groove and 72-clamping protrusion.

Detailed Description

To make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the following examples and drawings, and the exemplary embodiments and descriptions thereof of the present invention are only used for explaining the present invention, and are not intended as limitations of the present invention.

In the description of the present invention, it should be understood that the terms "front", "back", "left", "right", "upper", "lower", "vertical", "horizontal", "high", "low", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the scope of the present invention.

Example 1:

the skull bone flap fixing device shown in fig. 1 to 3 comprises a connecting rod 1, and an upper disc 4 and a lower disc 5 which are arranged on the connecting rod 1, wherein the upper disc 4 is connected with the connecting rod 1 through a thread, and a fastening hole 41 is arranged on the upper disc 4.

The skull bone flap fixing device further comprises a mounting tool sleeved on the connecting rod 1, a lock column 35 is arranged at the bottom end of the mounting tool, and the size of the lock column 35 is matched with that of the fastening hole 41; the over-torque protection mechanism comprises two thin columns 21, the two thin columns 21 are fixed on the bottom surface of the driving portion 2, the loading portion 3 comprises a groove with an upward opening, the groove and the bottom surface of the driving portion 2 form a closed accommodating cavity, a plurality of blocking pieces 31 are arranged in the groove, a first cavity 32 and a second cavity 33 are formed in the groove by the blocking pieces 31, the first cavity 32 and the second cavity 33 are identical in size, and the two thin columns 21 are respectively located in the first cavity 32 and the second cavity 33.

As shown in fig. 3, in the initial state, the distance from the thin column 21 in the first chamber 32 to the baffle 31 of the first chamber 32 is equal to the distance from the thin column 21 in the second chamber 33 to the baffle 31 of the second chamber 33, and the hardness of the thin column 21 in the first chamber 32 is equal to the hardness of the thin column 21 in the second chamber 33. The loading part 3 drives the loading part 3 to rotate through the matching of the thin column 21 and the baffle 31, and when the torque acted on the thin column 21 by the driving part 2 is larger than a threshold value, the thin column 21 is broken and/or the thin column 21 falls off from the bottom surface of the driving part 2.

Be provided with stand pipe 22 on the bottom surface of drive division 2, stand pipe 22 cover is established on connecting rod 1, and stand pipe 22 intercommunication loading portion 3's lower terminal surface and drive division 2's up end are provided with boss 23 that is located loading portion 3 below on the stand pipe 22, still have seted up incision 24 on the lateral wall of stand pipe 22.

Through the structure, when the skull flap fixing device is used, a doctor can apply accurate clamping force to the skull flap fixing devices in a short time without judging the torque and only applying the torque exceeding a threshold value, so that the skull flap is subjected to consistent clamping force of the upper disks, the mounting and dismounting efficiency of a mounting tool is effectively improved, potential safety hazards caused by uncertainty caused by human factors in the screwing process can be eliminated, the safety of the mounting process is remarkably improved, and the skull flap is effectively protected; in addition, different threshold values are set, so that the mounting mechanism can be applied to skull bone flaps with different hardness, a doctor can select a mounting tool with a proper threshold value before an operation, and the clamping stability is further improved.

In the structure, the mounting tool can only realize one-time switching from the driving state to the failure state, the screwing efficiency is higher, and meanwhile, after part of thin columns are broken due to misoperation, the mechanism avoids the situation that the mounting tool directly enters the failure state.

In some embodiments, the bottom surface of the upper disk 4 is provided with a first tooth 42, which ensures that the upper disk can maintain a sufficient pre-tightening force after the installation tool screws the upper disk; the second tooth 51 is arranged on the top surface of the lower disc 5, so that the stability of the skull flap can be further improved.

In some embodiments, the number of the blocking pieces 31 may be 1, and the number of the thin columns 21 may be 1 to simplify the structure of the installation tool.

In some embodiments, the installation tool includes at least two cavities and at least two thin columns 21, the thin columns 21 correspond to the cavities one by one, the distance from each thin column 21 to the stop piece 31 of the corresponding cavity is the same, and the hardness of each thin column 21 is the same.

In the technical scheme, the connection mode between the driving part 2 and the loading part 3 realizes that the accommodating cavity between the groove in the loading part 3 and the bottom surface of the driving part 2 is always closed in a driving state or a failure state; meanwhile, the guide tube 22 is used as a clamping piece, so that the structure of the mounting tool is simplified, the use of parts is reduced, and the total mass of the mounting tool is reduced; moreover, the loading part 3 and the driving part 2 are connected together all the time, so that the mounting tool is stronger in integrity and convenient to store, detach and use.

Example 2:

as shown in fig. 4, on the basis of embodiment 1, the size of the first chamber 32 is smaller than that of the second chamber 33. When the driving part 2 is combined with the loading part 3, in the initial state, the distance from the thin column 21 in the first chamber 32 to the baffle 31 of the first chamber 32 is less than the distance from the thin column 21 in the second chamber 33 to the baffle 31 of the second chamber 33, and the hardness of the thin column 21 in the first chamber 32 is less than the hardness of the thin column 21 in the second chamber 33.

Through the arrangement, in the process of screwing the skull bone flap fixing device, the mounting tool can realize two times of switching from a driving state to a failure state, wherein a time difference exists between the first switching and the second switching, and the torque required by the second switching is larger than that required by the first switching, so that a wider threshold value range is realized. When the clamping device is used, when the clamping force of the upper disc 4 on the skull flap is not enough to firmly clamp the skull flap after the first switching, a doctor can further increase the torque until a second threshold value is reached, so that more stable clamping force is provided for the skull flap in a short time, and the safety risk is reduced.

In some embodiments, the arc of the second chamber 33 is 2 to 4 times the arc of the first chamber 32.

In some embodiments, the driving portion 2 is provided with a groove that opens upward, the depth of the groove depends on the overall structural strength of the driving portion 2, and the groove facilitates reducing the weight of the driving portion, thereby reducing the total weight of the installation tool.

In some embodiments, all components of the installation tool are made of PLA.

Example 3:

as shown in fig. 5, an alternative solution of the over-torque protection mechanism is provided on the basis of the above-described embodiment. In the technical scheme, the installation tool can be continuously switched between the driving state and the failure state.

Specifically, the mounting tool includes a first shutter 61 fixed to the driving portion 2 and a second shutter 62 fixed to the loading portion 3, wherein the first shutter 61 or the second shutter 62 serves as an over-torque protection mechanism.

When the installation tool is used, the rotation driving part enables the lower portion of the first baffle plate 61 to be in contact with the upper portion of the second baffle plate 62, the rotation driving part 2 is continuously rotated to enable the first baffle plate 61 to provide torque for the second baffle plate 62 and drive the second baffle plate 62 to rotate, and the installation tool enters a driving state.

When the clamping force of the upper disc 4 on the skull bone flap reaches the upper limit value, the torque provided by the driving state cannot further rotate the loading part, the torque is increased to exceed the threshold value, so that the first baffle 61 is disconnected from the second baffle 62, the first baffle 61 continues to rotate, the second baffle 62 is kept still, the mounting tool enters a failure state, and the over-torque protection mechanism is separated from the driving part 2 or the loading part 3.

After the driving part 2 rotates once, the first baffle 61 will contact and form a connection with the second baffle 62 again, the loading part 3 is driven to rotate by the second baffle 62, and the installation tool enters the driving state again. By analogy, the setting tool can be continuously switched between the driving state and the failure state to ensure that the torque does not exceed the upper limit value.

In some embodiments, the lower portion of the first baffle 61 and the upper portion of the second baffle 62 are both provided with an anti-wear layer 63, which can not only reduce the wear of the first baffle and the second baffle, but also generate a certain deformation, thereby facilitating the separation of the first baffle and the second baffle, and further prolonging the service life of the first baffle and the second baffle.

In this structure, the coupling strength of the first shutter 61 and the second shutter 62 determines the threshold value of the torque. The mounting tool can be used repeatedly, but a certain torque can be generated when the mounting tool enters the driving state again from the failure state, so that the upper disc generates impact force on the skull bone fragments.

Example 4:

as shown in fig. 6, an alternative solution of the connection structure of the overdrive portion 2 and the loading portion 3 is provided on the basis of the above-described embodiment.

The bottom of the driving part 2 is provided with a clamping groove 71, and the bottom of the loading part 3 is provided with a clamping protrusion 72 matched with the clamping groove 71, so that the loading part cannot be separated from the driving part along the central axis direction thereof, but can rotate around the central axis thereof.

Example 5:

as shown in fig. 1 to 3, a handle 11 is arranged at the top of the connecting rod 1, a handle clamping groove 25 is arranged at the top of the driving part 2, and the handle 11 can be matched with the handle clamping groove 25; the loading part 3 further comprises an installation platform 34, the installation platform 34 is arranged on the bottom surface of the loading part 3, and a lock column 35 is arranged on the installation platform 34; the driving part 2 is provided with a first anti-slip part 26, and the loading part 3 is provided with a second anti-slip part 36.

Example 6:

the use method of the skull bone flap fixing device comprises the following steps:

(A) preparing, assembling installation tools, and sleeving the installation tools on corresponding skull flap fixing devices;

(B) placing a skull bone flap fixing device at the periphery of a bone flap to be fixed;

(C) reducing the skull flap, and lightly lifting the handle with the left hand to ensure that the lower disc of the skull flap fixing device is tightly attached to the inner surface of the skull; aligning and embedding a lock column of the mounting tool with a fastening hole of the upper disc, rotating the mounting tool clockwise by the right hand until the mounting tool slips and enters a failure state, and confirming that the upper disc is in contact with the skull surface and is fixed firmly;

(D) repeating steps (B) - (C) to install other skull flap fixation devices until all skull flap fixation devices are uniformly fixed around the flap.

In the above operation, the step (a) specifically includes the steps of:

(A1) aligning the hole on the loading part 3 with the guide tube 22 of the driving part 2, and sleeving the loading part 3 on the guide tube 22;

(A2) pushing the loading part 3 until the hole contacts the boss 23, and then rotating the loading part 3 to align the thin column 21 and the chamber;

(A3) the loading part 3 is pushed towards the driving part 2, and the guide tube 22 is deformed to a certain extent due to the existence of the notch 24, so that the outer diameter of the boss 23 is reduced;

(A4) after the hole of the loading part 3 passes through the boss 23, the outer diameter of the boss 23 is restored and the bottom of the loading part 3 is clamped.

By the method, when a doctor installs the skull flap fixing device, the doctor only needs to provide the torque larger than the threshold value to the driving part 2, so that the installation tool is switched from the driving state to the failure state after the upper disc 4 screws the skull flap, and on one hand, the clamping force of the upper disc 4 to the skull flap cannot be continuously increased; on the other hand, the reaction force of the driving part 2 on the hand of the doctor suddenly decreases, the driving part 2 slips, and the slipping phenomenon can intuitively and quickly remind the doctor that the torque reaches the threshold value.

In the whole installation process, a doctor can apply accurate clamping force to a plurality of skull flap fixing devices in a short time, so that the skull flaps are subjected to consistent clamping force of the upper disks, the installation and disassembly efficiency of an installation tool is effectively improved, potential safety hazards caused by uncertainty brought by human factors in the screwing process can be eliminated, the safety of the installation process is obviously improved, and the skull flaps are effectively protected; in addition, different threshold values are set, so that the mounting mechanism can be applied to skull bone flaps with different hardness, a doctor can select a mounting tool with a proper threshold value before an operation, and the clamping stability is further improved.

As used herein, "first," "second," etc. (e.g., first non-slip portion, second non-slip portion, first chamber, etc.) merely distinguish the respective components for clarity of description and are not intended to limit any order or to emphasize importance, etc. Further, the term "connected" used herein may be either directly connected or indirectly connected via other components without being particularly described.

The above-mentioned embodiments, further detailed description of the objects, technical solutions and advantages of the present invention, it should be understood that the above description is only the embodiments of the present invention, and is not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims (10)

1. The mounting tool of the skull bone flap fixing device is characterized by comprising a driving part (2), a loading part (3) and an over-torque protection mechanism arranged between the driving part (2) and the loading part (3), wherein the driving part (2) drives the loading part (3) to rotate through the over-torque protection mechanism, the loading part (3) is used for screwing the skull bone flap fixing device, and when the torque of the driving part (2) acting on the over-torque protection mechanism is larger than a threshold value, the over-torque protection mechanism is separated from the driving part (2) and/or the loading part (3).

2. A tool for installing a skull flap fixation device according to claim 1, characterized in that the over-torque protection mechanism is simultaneously disengaged from the drive part (2) and the loading part (3) when the torque of the drive part (2) acting on the over-torque protection mechanism is larger than a threshold value set by the over-torque protection mechanism.

3. The tool for installing a skull flap fixation device according to claim 2, characterized in that a closed accommodation cavity is formed between the driving part (2) and the loading part (3), and the over-torque protection mechanism is arranged in the accommodation cavity.

4. The tool for installing a skull flap fixation device according to claim 3, characterized in that the over-torque protection mechanism comprises a thin post (21), the thin post (21) being fixed on the bottom surface of the driving part (2); the loading part (3) comprises a groove with an upward opening, the groove and the bottom surface of the driving part (2) form a closed accommodating cavity, and a blocking piece (31) is arranged in the groove; the loading part (3) is driven to rotate by the matching of the thin column (21) and the blocking piece (31), and when the torque acted on the thin column (21) by the driving part (2) is larger than a threshold value, the thin column (21) is broken off and/or the thin column (21) falls off from the bottom surface of the driving part (2).

5. The tool for installing a skull flap fixation device according to claim 4, characterized in that a plurality of baffles (31) are arranged in the groove, the plurality of baffles (31) dividing the closed accommodation cavity into a plurality of chambers, each chamber having a thin column (21) arranged therein.

6. The mounting tool for the skull flap fixing device according to any one of claims 1 to 5, characterized in that a guide tube (22) is arranged on the bottom surface of the driving part (2), the guide tube (22) is communicated with the lower end surface of the loading part (3) and the upper end surface of the driving part (2), a boss (23) positioned below the loading part (3) is arranged on the outer wall of the guide tube (22), and a notch (24) is further formed in the side wall of the guide tube (22).

7. The mounting tool of the skull flap fixation device according to claim 6, characterized in that the loading part (3) further comprises a mounting table (34), the mounting table (34) is arranged on the bottom surface of the loading part (3), and the mounting table (34) is provided with a locking column (35).

8. A tool for installing a skull flap fixation device according to claim 6, characterized in that the driving part (2) is provided with a first non-slip part (26) and the loading part (3) is provided with a second non-slip part (36).

9. A skull bone flap fixing device comprises a connecting rod (1), an upper disc (4) and a lower disc (5) which are arranged on the connecting rod (1), wherein the upper disc (4) is connected with the connecting rod (1) through threads, and a fastening hole (41) is formed in the upper disc (4); still establish the mounting tool on connecting rod (1) including the cover, the mounting tool bottom is provided with lock post (35), the size of lock post (35) and the size phase-match of fastening hole (41), its characterized in that, mounting tool includes drive division (2), loading portion (3) and sets up the excessive torque protection mechanism between drive division (2) and loading portion (3), drive division (2) pass through it drives loading portion (3) rotation to cross torque protection mechanism, loading portion (3) are used for screwing skull bone lamella fixing device crosses torque protection mechanism and drive division (2) and/or loading portion (3) separation when the moment of torsion that drive division (2) acted on crossing torque protection mechanism is greater than the threshold value that torque protection mechanism set up.

10. The skull flap fixing device according to claim 9, characterized in that a handle (11) is arranged on the top of the connecting rod (1), a handle clamping groove (25) is arranged on the top of the driving part (2), and the handle (11) can be matched with the handle clamping groove (25); a guide pipe (22) is arranged on the bottom surface of the driving part (2), the guide pipe (22) is sleeved on the connecting rod (1), the guide pipe (22) is communicated with the lower end surface of the loading part (3) and the upper end surface of the driving part (2), a boss (23) positioned below the loading part (3) is arranged on the guide pipe (22), and a notch (24) is further formed in the side wall of the guide pipe (22); the over-torque protection mechanism comprises a thin column (21), the thin column (21) is fixed on the bottom surface of the driving portion (2), the loading portion (3) comprises a groove with an upward opening, the groove and the bottom surface of the driving portion (2) form a closed accommodating cavity, a blocking piece (31) is arranged in the groove, the loading portion (3) drives the loading portion (3) to rotate through the matching of the thin column (21) and the blocking piece (31), and when the torque of the driving portion (2) acting on the thin column (21) is larger than a threshold value, the thin column (21) is broken and/or the thin column (21) falls off from the bottom surface of the driving portion (2).

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