Head fixator

Abstract

The present invention discloses a skull fixator, which comprises a locking mechanism, a column base assembly and a coronal fixator. The locking mechanism is mounted on the column of the column base assembly and is clamped to the upper end of the column by an upper bracket of a gas spring of the locking mechanism. The connecting rod of the coronal fixator is installed in the hole of the ball rod of the locking mechanism. The two are connected and locked together by a locking handle on the coronal fixator. The skull fixator has a simple structure and will not fall over when force is applied. During the training of intern doctors or the experiment of medical workers, a skull model or a skull specimen is placed on the coronal fixator, which can well assist intern doctors or medical workers to complete relevant internships or preoperative surgical plan verification, shorten training time and reduce training costs. The potential benefits are shortening operation time, reducing patient pain, reducing doctor labor intensity and reducing operation costs.

Description

Technical Field

[0001] The present invention relates to the field of medical devices, and in particular to a skull fixator. Background Art

[0002] Before minimally invasive surgery or when training interns, a skull fixator is required to fix the skull model. Specifically, the skull fixator must meet the following requirements:

[0003] 1. Place the skull model on the fixator to train interns, shorten the training time, improve the training quality and reduce the training cost;

[0004] 2. Before difficult surgeries, surgeons need to verify the surgical plan, if necessary, by first verifying it on a skull specimen and placing the skull specimen on a fixture so that the surgeon can simulate the surgical movements and achieve the same effect as the surgical process, providing a reliable guarantee for the success of the surgery, indirectly reducing the patient's pain, and saving surgical time and costs.

[0005] 3. Provide a training platform for minimally invasive surgery to address the urgent need for intern training and preoperative plan verification;

[0006] There are fixing devices similar to coronal fixators in the prior art, such as the Chinese invention patent application number 201310276271.5, entitled "Temporal Bone and Skull Anatomy Fixation Device." Although it also has a locking and fixing function, its locking mechanism is complex, and the force required for locking is relatively large, and it is easy to overturn when force is applied. Summary of the Invention

[0007] The technical problem to be solved by the present invention is to provide a skull fixator with a simple locking structure and a mechanism that will not overturn when force is applied.

[0008] The head fixer of the present invention includes a column base assembly, a locking mechanism installed on the column of the column base assembly, and a coronal fixer for fixing the head model that is detachably connected to the locking mechanism. The locking mechanism includes a tightening screw plug, a slider, a screw plug, two copper top blocks, a ball seat, a ball cover, a ball rod, and a gas spring assembly that can drive the slider to move up and down along the column. The gas spring assembly includes a gas spring, an upper bracket of the gas spring, a front bracket of the lower shaft of the gas spring, a rear bracket of the lower shaft of the gas spring, and a lower shaft of the gas spring; the slider is sleeved on the column and slidably connected to the column, the slider is provided with a stepped transverse through hole and a radial through hole, the two copper top blocks are installed in the transverse through hole and are located on both sides of the column, the tightening screw plug is threadedly connected to the transverse through hole of the slider, and the screw plug is installed in the screw hole of the tightening screw plug The cam is secured in place and securely holds the cam in place until the cam is in a position to engage the locking cam and engage with the spring, which in turn holds the cam in place until the cam is in a position to engage with the spring.

[0009] The head fixator of the present invention, wherein the coronal fixator includes the connecting rod, a fixing ring, a locking handle, and a plurality of locking fixtures evenly distributed along the circumference of the fixing ring, the lower end face of the fixing ring is fixedly connected with an arc-shaped cross rod, the outer edge of the upper end face of the fixing ring is provided with a plurality of plug connectors, the number of the locking fixtures is the same as the number of the plug connectors, each locking fixture includes a plug rod that can be inserted into the fixing ring and a screw that locks the plug rod and the fixing ring, the plug end of the plug rod has a conical claw, one end of the connecting rod is fixedly connected to the outer wall of the fixing ring, the other end of the connecting rod is inserted into the hole, and the lower end of the locking handle is screwed into the ball rod and the connecting rod in sequence to connect the two together.

[0010] The head fixator of the present invention, wherein the column-base assembly includes the base, a connecting plate, and the column fixedly connected to the connecting plate, the column is inserted into a radial through hole, the connecting plate is fixedly connected to the base by a plurality of screws, and the base is a flat plate.

[0011] The skull fixator of the present invention, wherein the two copper top blocks have spherical protrusions, and the two spherical protrusions abut against the upright posts.

[0012] The head fixator of the present invention, wherein the locking mechanism further comprises a rod-shaped handle, and the handle is fixedly connected to the upper end of the head of the tightening screw plug.

[0013] The head fixator of the present invention is characterized in that the outer surface of the gas spring lower shaft is sheathed with a gas spring lower shaft sleeve.

[0014] The head fixator of the present invention has two screw plugs.

[0015] The head fixator of the present invention is different from the prior art in that it includes a locking mechanism, a column base assembly and a crown fixator. The locking mechanism is installed on the column of the column base assembly, and is clamped to the upper end of the column by the gas spring upper bracket of the locking mechanism. The connecting rod of the crown fixator is installed in the hole of the ball rod of the locking mechanism, and the two are connected together and locked by the locking handle on the crown fixator. Specifically, the locking mechanism includes a tightening screw plug, a slider, a screw plug, two copper top blocks, a ball seat, a ball cover, a ball rod, and a gas spring assembly that can drive the slider to move up and down along the column. The gas spring assembly includes The gas spring, the gas spring upper bracket, the gas spring lower shaft front bracket, the gas spring lower shaft rear bracket, the gas spring lower shaft, the gas spring lower shaft, the slider is sleeved on the column and slidably connected to the column, the slider is provided with a stepped transverse through hole and a radial through hole, two copper top blocks are installed in the transverse through hole and are located on both sides of the column, the tightening screw plug is threadedly connected to the transverse through hole of the slider, the screw plug is installed in the screw hole of the tightening screw plug and presses the left copper top block, the ball seat is installed in the transverse through hole and can contact the step of the transverse through hole and the copper top block on the right side, the right side of the ball seat is provided with a ball hole, the spherical head of the ball rod is installed in the ball seat and matches the ball hole, The ball cover is threadedly connected to the slider and presses the spherical head of the ball rod into the ball seat. The upper end of the gas spring is installed on the top of the column through the gas spring upper bracket. The lower end of the gas spring is hinged to the upper ends of the gas spring lower shaft front bracket and the gas spring lower shaft rear bracket through the gas spring lower shaft. The middle and lower parts of the gas spring lower shaft front bracket and the gas spring lower shaft rear bracket are fixed to the front and rear sides of the slider. The connecting rod of the crown fixer is installed in the hole of the ball rod of the locking mechanism and locked. When in use, the handle on the locking mechanism is turned clockwise by hand (or the tightening screw is turned clockwise), and the crown fixer is locked. Both the locking mechanism and the crown retainer are fixed to the column of the column-base assembly and cannot move up and down along the column, and the crown retainer cannot swing around the center of the ball head of the locking mechanism's ball shaft. By manually turning the handle on the locking mechanism counterclockwise (or turning the jackscrew counterclockwise), the crown retainer is released, and the locking mechanism and the crown retainer can move up and down along the column of the column-base assembly, and the crown retainer can swing around the center of the ball head of the locking mechanism's ball shaft. When in the released position, the guide rod of the gas spring on the locking mechanism pulls the locking mechanism and the crown retainer to prevent them from falling under the influence of gravity. The locking mechanism adopts a series force-amplifying structure, which reduces the applied force and has a simple locking structure. The overall center of gravity of the skull retainer is located within the base of the column-base assembly, and the mechanism will not tip over when force is applied.

[0016] The skull fixator of the present invention can reliably fix and adjust a skull model or specimen to the optimal height and posture for surgery, facilitating medical training and preoperative verification of surgical plans by surgeons. This indirectly improves surgical quality and reliability, reduces surgical risks, alleviates the physician's workload, reduces patient pain, and reduces surgical costs. The present invention can also be used in conjunction with various medical devices, such as endoscopes and electron microscopes held by electric surgical support arms, further improving training quality, shortening training time, reducing consumables, and lowering training costs.

[0017] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a front view of the head fixator of the present invention;

[0019] Figure 2 is a top view of the head fixator of the present invention;

[0020] Figure 3 This is a front view of the locking mechanism of the head fixator of the present invention;

[0021] Figure 4 A top view of the locking mechanism in the head fixator of the present invention;

[0022] Figure 5 For the Figure 4 A cross-sectional view taken along line AA, wherein the gas spring assembly is removed;

[0023] Figure 6 It is a partial cross-sectional view of the column and base assembly of the head fixator of the present invention;

[0024] Figure 7 A top view of the column and base assembly of the head fixator of the present invention;

[0025] Among them: 1-locking mechanism, 2-column base assembly, 3-handle, 4-tightening screw plug, 41-screw hole, 5-slider, 51-transverse through hole, 52-radial through hole, 6-gas spring lower shaft front bracket, 7-gas spring lower shaft rear bracket, 8-screw plug, 9-copper top block, 10-ball seat, 101-ball hole, 11-ball cover, 12-gas spring upper bracket, 13-clamping screw, 14-gas spring, 15-gas spring lower shaft, 16-gas spring lower sleeve, 17-fixing screw, 18-column, 19-base plate, 20-screw, 21-ball rod, 211-hole, 22-crown retainer, 23-connecting rod, 24-locking handle, 25-fixing ring, 251-plug connector, 252-cross rod, 26-connecting plate, 27-locking fixture, 271-plug rod, 2711-conical claw, 272-screw. DETAILED DESCRIPTION

[0026] In order to explain the technical solution, design advantages and usage of the present invention in more detail, the specific implementation of the head fixator is described below with the help of the accompanying drawings.

[0027] like Figure 1 As shown, the skull fixator of the present invention comprises a locking mechanism 1, a column-base assembly 2, and a crown fixator 22. The crown fixator 22 is used to secure the skull model and is detachably connected to the locking mechanism 1. The locking mechanism 1 is mounted on the column 18 of the column-base assembly 2. The upper bracket 12 of the locking mechanism 1 is clamped to the upper end of the column 18 via the gas spring. The connecting rod 23 of the crown fixator 22 is inserted into the hole of the ball rod 21 of the locking mechanism 1. The two are connected and locked together via a locking handle 24 on the crown fixator 22.

[0028] like Figure 1-5 As shown, the locking mechanism 1 includes a rod-shaped handle 3, a tightening screw plug 4, a slider 5, a screw plug 8, two copper top blocks 9, a ball seat 10, a ball cover 11, a ball rod 21, and a gas spring assembly that can drive the slider 5 to move up and down along the column 18. The gas spring assembly includes a gas spring 14, a gas spring upper bracket 12, a gas spring lower shaft front bracket 6, a gas spring lower shaft rear bracket 7, and a gas spring lower shaft 15; the slider 5 is sleeved on the column 18 and slidably connected to the column 18, and the slider 5 is provided with a stepped transverse through hole 5 1 and radial through-hole 52, two copper top blocks 9 are installed in the transverse through-hole 51 and are located on both sides of the column 18, the two copper top blocks 9 have spherical protrusions, the two spherical protrusions can abut against the column 18, and are symmetrically arranged along the column 18. The two copper top blocks 9 are clearance-matched with the transverse through-hole 51, and the longitudinal section of the tightening screw plug 4 is approximately L-shaped. The handle 3 is fixedly connected to the upper end of the head of the tightening screw plug 4, and the rod of the tightening screw plug 4 has a screw hole 41. The rod of the tightening screw plug 4 is threadedly connected to the transverse through-hole 51 of the slider 5. Inside, the screw plug 8 is installed in the screw hole 41 of the tightening screw plug 4 and presses the left copper top block 9, the ball seat 10 is installed in the horizontal through hole 51 and can contact the step of the horizontal through hole 51 and the copper top block 9 on the right, the right side of the ball seat 10 is provided with a ball hole 101, the spherical head of the ball rod 21 is installed in the ball seat 10 and has a clearance fit with the ball hole 101, the ball cover 11 is threadedly connected to the slider 5 and presses the spherical head of the ball rod 21 into the ball seat 10; the upper end of the gas spring 14 is installed through the gas spring upper bracket 12 At the top of the column 18, the lower end of the gas spring 14 is hinged to the upper ends of the gas spring lower shaft front bracket 6 and the gas spring lower shaft rear bracket 7 through the gas spring lower shaft 15. The middle and lower parts of the gas spring lower shaft front bracket 6 and the gas spring lower shaft rear bracket 7 are fixed to the front and rear sides of the slider 5, and the gas spring 14 pulls the slider 5; the connecting rod 23 of the crown fixer 22 is installed in the hole 211 of the ball rod 21 of the locking mechanism 1 and locked, and the overall center of gravity of the skull fixator is located in the base 19 of the column base assembly 2.

[0029] like Figure 1 、 2 As shown, the crown-shaped fixer 22 includes a connecting rod 23, a fixing ring 25, a locking handle 24, and a plurality of locking fixtures 27 evenly distributed along the circumference of the fixing ring 25. The lower end surface of the fixing ring 25 is fixedly connected with an arc-shaped cross rod 252. The outer edge of the upper end surface of the fixing ring 25 is provided with a plurality of plug connectors 251. The plug connectors can be made of square tubes. The outer wall of the plug connector is provided with a circular hole. The number of locking fixtures is the same as the number of plug connectors. Each locking fixture 27 includes a plug connector that can be inserted into the fixing ring. Rod 271 and screw 272 that locks the plug rod 271 and the fixing ring 25. After the plug rod 271 passes through the plug connector 251 and the fixing ring 25, the lower end of the screw 272 passes through the plug connector 251 and is pressed against the upper end surface of the plug rod. The plug end of the plug rod 271 has a conical claw 2711. One end of the connecting rod 23 is fixedly connected to the outer wall of the fixing ring 25, and the other end of the connecting rod 23 is inserted into the hole 211. The lower end of the locking handle 24 is screwed into the club and the connecting rod in turn to connect the two together.

[0030] like Figure 1 、 2 As shown in Figures 5-7, the column base assembly 2 includes a base 19, a connecting plate 26, and a column 18 fixedly connected to the connecting plate 26. The column 18 is inserted into the radial through hole 52, and the connecting plate 26 is fixedly connected to the base 19 by multiple screws 20. The base 19 is a flat plate with sufficient area to ensure that the center of gravity of the column 18 and the components carried thereon is within the flat plate. Under the action of gravity of these components, they will not overturn or fall over, and can be placed stably on the work surface; the column has sufficient strength and rigidity to ensure that the components carried thereon can move smoothly and will not get stuck due to deformation.

[0031] like Figure 5 As shown, the outer surface of the gas spring lower shaft 15 is covered with a gas spring lower shaft sleeve 16 .

[0032] like Figure 5 As shown, there are two screw plugs 8 in the present invention, which are connected in series to tighten the screw plug 4.

[0033] When the present invention is in use, the skull model is placed on the coronal fixator, and the locking fixture 27 is adjusted to fix the skull model. If the height of the skull model needs to be adjusted, the locking mechanism 1 must first be released and then locked. The specific adjustment process is: turn the handle 3 clockwise by hand, and the tightening screw 4 will rotate accordingly, driving the screw plug 8 to move, pressing the copper top block 9 on the left, and the copper top block 9 presses the column 18, thereby pressing the copper top block 9 on the right, and the copper top block 9 on the right presses the ball seat 10, and the ball seat 10 presses the ball rod 21, and the spherical head on the ball rod 21 presses the ball cover 11, thereby locking the locking mechanism 1 on the column 18, and cannot move up and down along the column 18. When the ball rod 21 is pulled by hand, the ball rod 21 cannot swing around the center of the ball; turn the handle 3 on the locking mechanism 1 counterclockwise by hand, and the tightening screw 4 connected to the lower end of the handle 3 loosens the copper top block 9 on the left, and the copper top block 9 on the left loosens the column 18, thereby loosening the right The copper top block 9 on the side is then released, and the ball seat 10 is released. The ball seat 10 releases the ball rod 21, and the ball head of the ball rod 21 releases the ball cover 11, so that the locking mechanism 1 is released and can move up and down along the column 18. The ball rod 21 is pulled by hand, and the ball rod 21 can swing around the center of the ball; the lower end of the gas spring 14 is hinged to the upper end of the gas spring lower shaft front bracket 6 and the gas spring lower shaft rear bracket 7 through the gas spring lower shaft 15, and the lower and middle parts of the gas spring lower shaft front bracket 6 and the gas spring lower shaft rear bracket 7 are fixed to the front and rear sides of the slider 5, and the guide rod of the gas spring 14 pulls the slider 5, that is, when it is in the released position, the guide rod of the gas spring 14 on the locking mechanism 1 pulls the locking mechanism 1 to prevent it from falling under the action of its gravity.

[0034] In the skull fixator of the present invention, the locking mechanism 1 is of a series force-amplifying type and has a self-locking function. The structure is simple and reliable, and the operation is convenient. By manually pulling the handle 3 on the locking mechanism 1, the coronal fixator 22 with adjusted height and posture can be easily, quickly and reliably locked, which is convenient for setting the skull model or skull specimen in the best practice position. The gas spring 14 of the locking mechanism 1 is connected to the upper end of the column 18 of the column base assembly 2 through the gas spring upper bracket 12. When the lock is released, the pull rod of the gas spring 14 pulls the locking mechanism 1 and the coronal fixator 22, so that they cannot fall under the action of gravity; the pull rod of the gas spring 14 can be extended and retracted, so that the locking mechanism 1 and the coronal fixator 22 can move up and down along the column 18, that is, the height of the coronal fixator 22 can be adjusted within the required range. The column-base assembly 2 serves as the supporting structure of the head fixator and has sufficient mechanical strength and rigidity to withstand the components mounted thereon without damage or deformation during long-term operation. It can be placed stably and reliably on the work surface of the laboratory table. The structure meets ergonomic requirements, is light in weight, and is easy to move. The overall center of gravity of the head fixator is located within the base 19 of the column-base assembly 2. The center of gravity is reasonably designed, and it will not shake or overturn due to the operator's movements during operation.

[0035] The present invention solves the current problems faced by medical schools, medical research institutes, and hospitals in minimally invasive surgery training for medical personnel and preoperative plan verification for surgeons. The locking mechanism is simple and reliable, and the connection between the locking mechanism and the coronal fixator is simple and reliable. The center of gravity of the entire structure is located within the base of the column-base assembly, enabling the skull model or specimen to be reliably fixed and adjusted to the optimal height and posture for surgery, facilitating medical personnel training and preoperative plan verification for surgeons. Furthermore, the present invention can be used in conjunction with various devices, such as endoscopes and electron microscopes held by electric surgical support arms, further improving training quality, shortening training time, reducing consumables, and lowering training costs. It also facilitates preoperative verification of surgical plans, creates a comfortable surgical environment, and indirectly improves surgical quality and reliability, reduces surgical risks, alleviates the workload of surgeons, reduces patient pain, and reduces surgical costs.

[0036] Those skilled in the art should know that the protection scheme of the present invention is not limited to the above-mentioned embodiments, and various arrangements, combinations and transformations can be made on the basis of the above-mentioned embodiments. Without violating the spirit of the present invention, various transformations of the present invention fall within the protection scope of the present invention.

Claims

1. A skull fixator, characterized in that: The invention comprises a column base assembly (2), a locking mechanism (1) mounted on a column (18) of the column base assembly (2), and a coronal fixer (22) for fixing a skull model detachably connected to the locking mechanism (1), wherein the locking mechanism (1) comprises a tightening screw plug (4), a slider (5), a screw plug (8), two copper top blocks (9), a ball seat (10), a ball cover (11), a ball rod (21), and a gas spring assembly capable of driving the slider (5) to move up and down along the column (18), wherein the gas spring assembly comprises a gas spring (14), a gas spring Spring bracket (12), gas spring lower shaft front bracket (6), gas spring lower shaft rear bracket (7), gas spring lower shaft (15); slider (5) is sleeved on the column (18) and slidably connected to the column (18), the slider (5) is provided with a stepped transverse through hole (51) and a radial through hole (52), two copper top blocks (9) are installed in the transverse through hole (51) and are located on both sides of the column (18), the top screw plug (4) is threadedly connected to the transverse through hole (51) of the slider (5), and the screw plug (8) is installed in the screw hole (41) of the top screw plug (4) The ball seat (10) is mounted in the transverse through hole (51) and can contact the step of the transverse through hole (51) and the copper top block (9) on the right side. The right side of the ball seat (10) is provided with a ball hole (101). The spherical head of the ball rod (21) is mounted in the ball seat (10) and matches the ball hole (101). The ball cover (11) is threadedly connected to the slider (5) and presses the spherical head of the ball rod (21) in the ball seat (10); the upper end of the gas spring (14) is mounted on the column ( 18), the lower end of the gas spring (14) is hinged to the upper ends of the gas spring lower shaft front bracket (6) and the gas spring lower shaft rear bracket (7) through the gas spring lower shaft (15), and the middle and lower parts of the gas spring lower shaft front bracket (6) and the gas spring lower shaft rear bracket (7) are fixed to the front and rear sides of the slider (5); the connecting rod (23) of the crown fixator (22) is installed in the hole (211) of the ball rod (21) of the locking mechanism (1) and locked, and the center of gravity of the whole skull fixator is located in the base (19) of the column base assembly (2).

2. The head fixator according to claim 1, characterized in that: The crown-shaped fixer (22) includes the connecting rod (23), a fixing ring (25), a locking handle (24), and a plurality of locking fixtures (27) uniformly distributed along the circumference of the fixing ring (25). The lower end surface of the fixing ring (25) is fixedly connected with an arc-shaped cross rod. The outer edge of the upper end surface of the fixing ring (25) is provided with a plurality of plug connectors. The number of the locking fixtures is the same as the number of the plug connectors. Each locking fixture (27) includes a plug rod (271) that can be inserted into the fixing ring and a screw (272) that locks the plug rod (271) and the fixing ring (25). The plug end of the plug rod (271) has a conical claw (2711). One end of the connecting rod (23) is fixedly connected to the outer wall of the fixing ring (25), and the other end of the connecting rod (23) is inserted into the hole (211). The lower end of the locking handle (24) is screwed into the ball rod and the connecting rod in sequence to connect the two together.

3. The head fixator according to claim 2, characterized in that: The column-base assembly (2) comprises the base (19), a connecting plate (26), and the column (18) fixedly connected to the connecting plate (26); the column (18) is inserted into a radial through hole (52); the connecting plate (26) is fixedly connected to the base (19) via a plurality of screws (20); and the base (19) is a flat plate.

4. The head fixator according to claim 3, characterized in that: The two copper top blocks (9) have spherical protrusions, and the two spherical protrusions abut against the columns (18).

5. The head fixator according to claim 4, characterized in that: The locking mechanism (1) further comprises a rod-shaped handle (3), which is fixedly connected to the upper end of the head of the tightening screw plug (4).

6. The head fixator according to claim 5, characterized in that: The outer surface of the gas spring lower shaft (15) is sleeved with a gas spring lower shaft sleeve (16).

7. The head fixator according to claim 6, characterized in that: There are two screw plugs (8).

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