Fixing device, installation tool and fixing method of the cranial flap

Abstract

A fixing device and an installation tool and a fixing method of the cranial flap, wherein the installation tool comprises a driving part, a loading part and an over torque protection mechanism disposed between the driving part and the loading part, the driving part drives the loading part to rotate by the over torque protection mechanism, the loading part is used for tightening the cranial flap fixation device, 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 will be separated from the driving part and/or the loading part. The present invention not only effectively improves the installation and disassembly efficiency of the installation tool, but also eliminates hidden safety hazards caused by uncertainties caused by human factors in the tightening process, significantly improves the safety of the installation process.

Claims

1. An installation tool for installing a cranial flap fixation device, comprising a driving part, a loading part and an over torque protection mechanism disposed between the driving part and the loading part; wherein the driving part drives the loading part to rotate by the over torque protection mechanism and the loading part is used for tightening the cranial flap fixation device; wherein when a torque of the driving part acting on the over torque protection mechanism is larger than a threshold value, the over torque protection mechanism will be separated from the driving part and/or the loading part; wherein a closed accommodating cavity is formed between the driving part and the loading part, and the over torque protection mechanism is disposed in the accommodating cavity; wherein the over torque protection mechanism comprises a thin column fixed on a bottom surface of the driving part; the loading part includes a groove with an upward opening, the groove and the bottom surface of the driving part form the closed accommodating cavity, and a baffle is disposed in the groove; the loading part is driven to rotate through cooperation of the thin column and the baffle; when a torque of the driving part acting on the over torque protection mechanism is larger than the threshold value, the thin column will be broken and/or the thin column will fall off from the bottom surface of the driving part.

2. The installation tool according to claim 1, wherein 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 will be separated from the driving part and the loading part.

3. The installation tool according to claim 1, wherein a plurality of baffles are disposed in the groove, and the plurality of baffles divide the closed accommodating cavity into a plurality of chambers.

4. The installation tool according to claim 1, wherein a guide tube is disposed on a bottom surface of the driving part, the guide tube connects a lower end face of the loading part and an upper end face of the driving part, a boss located below the loading part is disposed on the outer wall of the guide tube, and a side wall of the guide tube is opened with an incision.

5. The installation tool according to claim 4, wherein the loading part further comprises an installation table, the installation table is disposed on a bottom surface of the loading part, and the installation table is set with a locking column.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) The drawings described here are used to provide a further understanding of the embodiments of the present invention, which forms a part of the application rather than a limitation to the embodiments of the present invention. In the attached picture:

(2) FIG. 1 is a schematic structural diagram of the cranial flap fixation device in embodiment 1 of the present invention;

(3) FIG. 2 is a schematic structural diagram of the upper section of the installation tool in embodiment 1 of the present invention;

(4) FIG. 3 is a planform of the low section of the installation tool in embodiment 1 of the present invention;

(5) FIG. 4 is a schematic structural diagram of the low section of the installation tool in embodiment 2 of the present invention;

(6) FIG. 5 is a schematic structural diagram of the installation tool in embodiment 3 of the present invention;

(7) FIG. 6 is a schematic diagram of the connection relationship between the driving part and the loading part in the embodiment 4 of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

(8) In order to make the objectives, technical solutions, and advantages of the present invention clearer, the following describes the present invention in further detail with reference to the embodiments and drawings; the exemplary embodiments of the present invention and the description thereof are only used to explain the present invention, not as a limitation of the present invention.

(9) In the description of the present invention, it should be understood that the terms “front”, “rear”, “left”, “right”, “upper”, “lower”, “vertical”, “horizontal”, “high”, “low”, “inner”, “outer” indicating the orientation or the positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or the element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the protection scope of the present invention.

Embodiment 1

(10) The cranial flap fixation device shown in FIGS. 1 to 3, comprises a connecting rod 1, an upper disc 4 and a lower disc 5 disposed on the connecting rod 1, wherein the upper disc 4 and the connecting rod 1 are connected by threads, a fastening hole 41 is set on the upper disc 4.

(11) The cranial flap fixation device further comprises an installation tool sleeved on the connecting rod 1, wherein a locking column 35 is disposed on the bottom end of the installation tool, and the size of the locking column 35) matches the size of the fastening hole 41; the over torque protection mechanism comprises a thin column 21 fixed on the bottom surface of the driving part 2; the loading part 3 includes a groove with an upward opening, the groove and the bottom surface of the driving part 2 form the closed accommodating cavity, and a plurality of baffles 31 are disposed in the groove, the plurality of baffles 31 form a first chamber 32 and a second chamber 33 in the groove, the size of the first chamber 32 and the second chamber 33 are the same, the two thin columns 21 are respectively located in the first chamber 32 and the second chamber 33.

(12) 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, meanwhile, the hardness of the thin column in the first chamber 32 is equal to the hardness of the thin column in the second chamber 33. The loading part 3 is driven to rotate through the cooperation of the thin column 21 and the baffle 31; when the torque of the driving part 2 acting on the thin column 21 is larger than the 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.

(13) A guide tube 22 is disposed on the bottom surface of the driving part 2, the guide tube connects the lower end face of the loading part 3 and the upper end face of the driving part 2, a boss 23 located below the loading part 3 is disposed on the outer wall of the guide tube 22, and the side wall of the guide tube 22 is also opened with an incision 24.

(14) Through the above structure, when in use, the doctor does not need to estimate the torque, and only applies a torque that exceeds the threshold value to apply precise clamping force on the multiple cranial flap fixation devices in a short time, so that the clamping forces applied on the cranial flap by the upper discs are consistent, which not only effectively improves the installation and disassembly efficiency of the installation tool, but also eliminates safety hazards caused by uncertainties caused by human factors during the tightening process, significantly improves the safety of the installation process, and effectively protects the cranial flap; in addition, by setting different threshold values, the installation mechanism can be applied to cranial flaps with different hardness, the doctor can select the installation tool with appropriate threshold value before craniotomy, which further improves the stability of the clamping.

(15) In the above structure, the installation tool can only switch from driving state to failure state once, and the tightening efficiency is higher. At the same time, after some thin columns are broken due to misoperation, the above mechanism avoids the situation that the installation tool directly enters the failure state.

(16) In some embodiments, a first tooth is installed on the bottom surface of the upper disc to ensure that the upper disc can maintain sufficient pre-tightening force after the installation tool is tightened; a second tooth installed on the top surface of the lower disc can further improve the stability of the cranial flap.

(17) In some embodiments, the number of the baffle 31 can be one, and the number of the thin column 21 can be one to simplify the structure of the installation tool.

(18) In some embodiments, the installation tool includes at least two chambers and at least thin columns 21, the thin columns 21 are in one-to-one correspondence with the chambers, the distance between each thin column 21 to the baffle 31 of the corresponding cavity are the same, and the hardness of each thin column 21 is the same.

(19) In this technical scheme, the connection mode of the driving part and the loading part 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; at the same time, the guide tube is used as the stuck part, which simplifies the overall structure of the installation tool, reduces the use of components, and reduces the total mass of the installation tool; besides that, the loading part and the driving part are always connected together, which makes the integrity of the installation tool stronger, facilitates the storage, disassembly and use of the installation tool.

Embodiment 2

(20) As shown in FIG. 4, based on the embodiment 1, the size of the first chamber 32 is smaller than the size 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 smaller than the distance from the thin column 21 in the second chamber 33 to the baffle 31 of the second chamber 33; meanwhile, the hardness of the thin column in the first chamber 32 is smaller than that of the thin column in the second chamber 33.

(21) With the above settings, in the process of tightening the cranial flap fixation device, the installation tool can switch from driving state to failure state twice, in which there is a time difference between the first switch and the second switch, and the torque required for the second switch is greater than that required for the first switch, so as to achieve a wider range of the threshold value. In use, when the clamping force of the upper disc on the cranial flap after the first switch is not enough to fix the cranial flap firmly, the doctor can further increase the torque until the second threshold value is reached, thereby providing a more stable clamping force on the cranial flap, and reducing the safety risks.

(22) In some embodiments, the arc of the second chamber 33 is 2 to 4 times as large as the arc of the first chamber 32.

(23) In some embodiments, the groove with an upward opening is disposed on the driving part, the depth of the groove depends on the overall structural strength of the driving part, the groove is beneficial to reduce the weight of the driving part and thus reduce the total weight of the installation tool.

(24) In some embodiments, all components of the installation tool can be made of PLA.

Embodiment 3

(25) As shown in FIG. 5, an alternative technical scheme of the over torque protection mechanism is provided by the basis of the above-mentioned embodiment. In this technical scheme, the installation tool can continuously switch between driving state and failure state.

(26) Specifically, the installation tool includes a first baffle 61 fixed on the driving part 2 and a second baffle 62 fixed on the loading part 3, wherein the first baffle 61 or the second baffle 62 serves as an over torque protection mechanism.

(27) When in use, rotate the driving part to make the first baffle 61 contact the second baffle 62, continue to rotate the driving part 2 to make the first baffle 61 provide torque to the second baffle 62 and drive the second baffle 62 to rotate until the installation tool enters driving state.

(28) When the clamping force of the upper disc 4 on the cranial flap reaches the upper limit value, the torque provided by the driving state cannot further rotate the loading part, increasing the torque will cause the torque to exceed the threshold value, which causes the first baffle 61 to disconnect from the second baffle 62, the first baffle 61 continues to rotate but the second baffle 62 remains stationary, the installation tool enters the failure state, and the over torque protection mechanism is separated from the driving part or the loading part.

(29) After the driving part rotates one turn, the first baffle 61 will contact the second baffle 62 again and form a connection, and drive the loading part 3 to rotate by the second baffle 62, and then the installation tool enters the driving state again. By analogy, the installation tool can continuously switch between driving state and failure state to ensure that the torque does not exceed the upper limit value.

(30) In some embodiments, both the lower part of the first baffle 61 and the upper part of the second baffle 62 are disposed with an anti-wear layer 63; the anti-wear layer can not only reduce the wear of the first baffle and the second baffle, but also produce a certain deformation, which is beneficial to the separation of the first baffle and the second baffle, thereby extending the service life of the first baffle and the second baffle.

(31) In this structure, the connection strength of the first baffle 61 and the second baffle 62 determines the torque threshold value. The installation tool can be used repeatedly, but each time when it enters the driving state from the failure state, a certain torque will be generated, which makes the upper disc produce the impact to the cranial bone fragment.

Embodiment 4

(32) As shown in FIG. 6, an alternative technical scheme for the connection structure of the driving part 2 and the loading part 3 is provided by the basis of the above-mentioned embodiment.

(33) The stuck slot 71 is disposed on the bottom of the driving part 2, and a stuck convex 72 matching the stuck slot 71 is disposed on the bottom of the loading part 3, so that the loading part cannot be separated from the driving part along the direction of the central axis, but can rotate around the central axis.

Embodiment 5

(34) As shown in FIGS. 1 to 3, the handle 11 is disposed on the top of the connecting rod 1, the handle stuck slot 25 is disposed on the top of the driving part 2, and the handle 11 can be matched with the handle stuck slot 25; the loading part 3 further comprises the installation table 34, the installation table 34 is disposed on the bottom surface of the loading part 3, the installation table 34 is set with the locking column 35; the first anti-slip part 26 is set on the driving part, and a second anti-slip part 36 is set on the loading part.

Embodiment 6

(35) The using method of the cranial flap fixation device includes the following steps:

(36) (A) preparation work, assembling the installation tool, and setting the installation tool on the corresponding cranial flap fixation device;

(37) (B) placing the cranial flap fixation device around the cranial flap to be fixed;

(38) (C) cranial flap restoration, gently lifting the handle with the left hand to make the lower disc of the cranial flap fixation device close to the inner surface of the skull; aligning the locking column of the installation tool with the fastening hole of the upper disc, and turning the installation tool clockwise with right hand until the installation tool slips in the failure state, to confirm that the upper disc is in contact with the cranial surface and fixed firmly;
(D) repeating the steps (B)-(C) to install other cranial flap fixation devices until all the cranial flap fixation devices are evenly fixed around the cranial flap.

(39) In the above operation, step (A) specifically includes the following steps:

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

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

(42) (A3) pushing the loading part 3 in the direction of the driving part 2, the guide tube 22 has a certain deformation due to the existence of the incision 24, which makes the outer diameter of the boss 23 decrease;

(43) (A4) after the hole of the loading part 3 passes through the boss 23, the outer diameter of the boss 23 recovers and forms a stuck connection at the bottom of the loading part 3.

(44) Through the above method, when the doctor installs the cranial flap fixation device, the doctor only needs to provide the driving part 2 with the torque larger than the threshold value, so that after the cranial flap is tighten by the upper disc 4, the installation tool will switch from the driving state to the failure state; on one hand, the clamping force of the upper disc on the cranial flap cannot be increased; on the other hand, the reaction force of the driving part acting on the doctor's hand drops sharply, and the driving part is slipping, which can intuitively and quickly remind the doctor that the torque has reached the threshold value.

(45) The “first”, “second” (for example, the first anti-skip part, the second anti-skip part, the first chamber, the first chamber) used herein are only used to distinguish the corresponding components for clarity of description. It is not intended to limit any order or emphasize importance. In addition, the term “connected” used in this text may be directly connected or indirectly connected via other components unless otherwise specified.

(46) The specific embodiments described above describe the purpose, technical solutions and beneficial effects of the present invention in further detail. It should be understood that the above are only specific embodiments of the present invention and are not intended to limit the protection scope of the present invention, any modification, equivalent replacement, improvement made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.