A neurosurgery cranial fixation device

Abstract

The present invention discloses a neurosurgery cranial fixation device, including a C-shaped fixing frame, on which a plurality of head nails are screwed, and also including a plurality of tightening knobs corresponding to the head nails one by one, wherein the head nail includes a connecting end and an embedding end, and the tightening knob has an operating position connected to the connecting end and a protective position fixed to the C-shaped fixing frame. The present invention provides a neurosurgery cranial fixation device, in the operating position, the connecting end of the head nail is connected to one end of the tightening knob, at which time the tightening knob and the head nail form an integrated structure, at which time the tightening knob can be rotated to drive the head nail to move toward the skull direction to embed the head nail in the skull, and in the protective position, one end of the tightening knob is separated from the connecting end of the head nail, so that when the medical staff touches the head nail during the operation, they only touch the tightening knob, and at this time the tightening knob has no direct connection with the head nail, which obviously protects the head nail.

Description

Technical Field

[0001] The invention relates to the field of surgical instruments, and in particular to a cranial fixation device for neurosurgery. Background Art

[0002] With the widespread application of microscopes and navigation systems in cranial surgery, good patient posture during cranial surgery has become more important, and head fixation devices have become one of the most important medical devices in neurosurgery. Commonly used head fixation devices in clinical practice include head frames and horseshoe-shaped head supports. The most commonly used head frame is the three-pin head frame, which is divided into upper and lower parts. The upper part is a C-shaped fixation frame and head pins for fixing the head. Three head pins are used to fix the head. The head pins penetrate the skin and then partially embed into the skull to stabilize the head. The lower part consists of a base with a laterally movable support arm and a rotating adapter, which is connected to the operating table.

[0003] The specific operation of fixing the head by the head fixation device is that one doctor fixes the patient's head with both hands, and the other doctor places the C-type fixation frame firmly on the patient's skull, and then uses the contralateral single nail to apply pressure and fix it, and squeezes the C-type fixation frame together by sliding the ratchet until the three head nails are in contact with the skull, and screws the head nail into the skull by tightening the knob, turns the knob (usually 4 grids), adjusts the pressure to 551.6 kPa and locks it, embeds the head nail into the skull, adjusts to the ideal head position, and fixes the joints of the head frame.

[0004] For example, the authorization announcement number is CN213606956U, the authorization announcement date is July 6, 2021, and its name is "A cervical vertebra surgical positioning frame". The patent application discloses a cervical vertebra surgical positioning frame, which is mainly composed of a three-nail head frame, a universal swing arm, a universal swing arm fixed seat, a traction swing arm, a traction swing arm base, a traction frame outer frame, a screw, a guide column, an L-shaped handle, a round handle, a universal handle, a slider, a traction pulley, a traction adjustment rod, a connecting column, a slide rod, a traction pulley bracket, a cervical vertebra traction clamp, an upper caliper, a lower caliper, a carbon fiber tube rear end connector, a carbon fiber tube rear end connector and a caliper weldment, a backstop barb, a plum blossom handle, and a T-handle. Based on this application, whether the patient is in a prone or supine position, the head can be fixed in an ideal position through the three-nail head frame, which is conducive to the exposure of the surgical field of the cervical spine and allows the operation to be completed smoothly and quickly; patients of different ages only need to adjust the forward and backward movement of the traction base, which is simple, convenient and quick to operate.

[0005] The shortcomings of the above-mentioned patents are that, for the safety of the operation, the existing technology achieves complete fixation of the skull and brain, and the three head pins of the three-nail head frame are embedded in the skull with sharp shapes. However, this obviously brings risks. If accidentally touched by external force, the embedded ends of the head pins may slide on the scalp surface other than the surgical position. In order to prevent this, the existing technology strictly prohibits medical staff from touching or even approaching the three-nail head frame, especially touching the head pins, during the operation, which increases the difficulty of the operation. Summary of the invention

[0006] The purpose of the present invention is to provide a neurosurgery cranial fixation device to solve the above-mentioned deficiencies in the prior art.

[0007] In order to achieve the above object, the present invention provides the following technical solutions:

[0008] A neurosurgery cranial fixation device comprises a C-shaped fixing frame, on which a plurality of head nails are screwed, and a plurality of tightening knobs corresponding to the head nails one by one, wherein the head nails comprise a connecting end and an embedding end, and the tightening knob has an operating position connected to the connecting end and a protective position fixed to the C-shaped fixing frame.

[0009] The above-mentioned neurosurgery cranial fixation device has three head pins.

[0010] In the above-mentioned neurosurgical cranial fixation device, a center rod is provided on the tightening knob. In the operating position, one end of the center rod passes through the tightening knob and is inserted into the head nail. The tightening knob drives the head nail to rotate. In the protection position, the center rod is detached from the head nail.

[0011] In the above-mentioned neurosurgery cranial fixation device, the central rod comprises a rod head and a rod shaft, and the rod shaft is a rectangular parallelepiped.

[0012] In the above-mentioned neurosurgical cranial fixation device, the central rod includes a rhombus-shaped bracket, and the rhombus-shaped bracket includes a contracted state and an open state. In the operating position, the rhombus-shaped bracket is in the open state, and in the protective position, the rhombus-shaped bracket is in the contracted state.

[0013] In the above-mentioned neurosurgery cranial fixation device, a locking piece is arranged on the rod body. In the operating position, the locking piece fixes the central rod in the head nail, and in the protection position, the locking piece fixes the central rod in the tightening knob.

[0014] In the above-mentioned neurosurgery cranial fixation device, the locking member includes a driving member and an abutment plate, the abutment plate is installed on the outer wall of the rod body, the driving member is connected to the abutment plate, and the driving member is used to drive the abutment plate to move radially.

[0015] In the above-mentioned neurosurgery cranial fixation device, a shock-absorbing member is arranged on the outer wall of the abutment plate, and the shock-absorbing member is used to achieve soft contact between the abutment plate and the inner wall of the head nail and the inner wall of the abutment plate.

[0016] In the above-mentioned neurosurgery cranial fixation device, the shock absorbing component comprises a rubber strip.

[0017] The present invention provides a neurosurgery skull fixation device, in which, in the operating position, the connecting end of the head nail is connected to one end of the tightening knob, and the tightening knob and the head nail form an integrated structure. At this time, the tightening knob can be rotated to drive the head nail to move toward the skull to embed the head nail in the skull, and in the protection position, one end of the tightening knob is separated from the connecting end of the head nail, and the tightening knob and the head nail form a split structure, so that when medical staff touch the head nail during the operation, they only touch the tightening knob, and at this time the tightening knob has no direct connection with the head nail, which obviously protects the head nail. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0019] Figure 1 A schematic diagram of the structure of a craniocerebral fixation device provided in an embodiment of the present invention;

[0020] Figure 2 A cross-sectional view of a tightening knob provided by an embodiment of the present invention in an operating position;

[0021] Figure 3 A cross-sectional view of a tightening knob provided by an embodiment of the present invention when in a protection position;

[0022] Figure 4 A schematic structural diagram of a center rod provided in another embodiment of the invention;

[0023] Figure 5 A cross-sectional view of a tightening knob in an operating position provided for another embodiment of the invention;

[0024] Figure 6 A cross-sectional view of a tightening knob in a protection position provided for another embodiment of the invention;

[0025] Figure 7 A cross-sectional view of a tightening knob in an operating position provided in yet another embodiment of the invention.

[0026] Description of reference numerals:

[0027] 1. C-type fixing frame; 2. Tightening knob; 2.1. Operating end; 2.2. Knob slot; 3. Head nail; 3.1. Embedding end; 3.2. Connecting end; 3.3. Head nail slot; 4. Center rod; 4.1. Rod head; 4.2. Rod body; 5. Diamond bracket; 5.1. Connecting rod; 5.2. Upper rotating shaft; 5.3. Lower rotating shaft; 9.1. Push rod; 9.2. Push block; 10. Abutment plate; 11. Reset block; 12. Elastic member; 13. Rectangular hole; 14. Rubber strip. DETAILED DESCRIPTION

[0028] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0029] Reference Figure 1-7 An embodiment of the present invention provides a neurosurgery cranial fixation device, including a C-shaped fixing frame 1, on which a plurality of head nails 3 are screwed, and also includes a plurality of tightening knobs 2 corresponding to the head nails 3 one by one, the head nail 3 includes a connecting end 3.2 and an embedding end 3.1, and the tightening knob 2 has an operating position connected to the connecting end 3.2 and a protective position fixed to the C-shaped fixing frame 1.

[0030] Specifically, the C-shaped fixing frame 1 is provided with a plurality of screw holes, and the plurality of screw holes are used for screwing the plurality of head nails 3 in a one-to-one correspondence. Preferably, the C-shaped fixing frame 1 is provided with three screw holes, and the head nails 3 are provided with three pieces. The head nail 3 includes a connecting end 3.2 and an embedding end 3.1. The connecting end 3.2 of the head nail 3 is provided with an external thread, so that the connecting end 3.2 of the head nail 3 is screwed into the screw hole on the C-shaped fixing frame 1, and the embedding end 3.1 of the head nail 3 is sharp. The embedding end 3.1 of the head nail 3 is embedded in the skull to fix the brain, and also includes a plurality of tightening knobs 2 corresponding to the head nails 3 in a one-to-one correspondence. Preferably, the tightening knob 2 includes an abutting end and an operating end 2.1. The operating end 2.1 is used by a doctor to operate the tightening knob 2 to rotate it, and the abutting end An external thread is provided on the connecting end, and the abutting end is used to be screwed into the screw hole and abut the connecting end 3.2 of the head nail. The tightening knob 2 has an operating position abutting the connecting end 3.2 and a protective position fixed to the C-shaped fixing frame 1. In the operating position, the abutting end of the tightening knob 2 abuts the connecting end of the head nail 3 to form an integrated rotating structure, so that the embedding end 3.1 of the head nail 3 is embedded in the skull by rotating the operating end 2.1 of the tightening knob 2. In the protective position, the operating end 2.1 of the tightening knob 2 is rotated so that the abutting end of the tightening knob 2 is separated from the connecting end 3.2 of the head nail. In this way, during the operation, when the medical staff touches the head nail 3, they only touch the operating end 2.1 of the tightening knob 2, thereby protecting the head nail 3.

[0031] An embodiment of the present invention provides a neurosurgery cranial brain fixation device, in the operating position, the connecting end 3.2 of the head nail 3 is connected to one end of the tightening knob 2, at this time, the tightening knob 2 and the head nail 3 form an integrated structure, at this time, the tightening knob 2 can be rotated to drive the head nail 3 to move toward the skull to embed the head nail 3 in the skull, in the protection position, one end of the tightening knob 2 is separated from the connecting end 3.2 of the head nail 3, at this time, the tightening knob 2 and the head nail 3 form a split structure, so that when the medical staff touches the head nail 3 during the operation, they only touch the tightening knob 2, and at this time, the tightening knob 2 has no direct connection with the head nail 3, which obviously protects the head nail 3.

[0032] In another embodiment provided by the present invention, it also includes a center rod 4, wherein the center rod 4 includes a rod head 4.1 and a rod body 4.2. Preferably, the rod body 4.2 is a rectangular parallelepiped, and a through knob groove 2.2 is provided at the axial center position on the tightening knob 2, and a head nail groove 3.3 is provided at the axial center position on the head nail 3, and the radial dimension of the head nail groove 3.3 is the same as the radial dimension of the knob groove 2.2. In the operating position, one end of the center rod 4 passes through the knob groove 2.2 of the tightening knob 2 and is inserted into the head nail groove 3.3 of the head nail 3. At this time, when the abutting end of the tightening knob 2 abuts against the connecting end 3.2 of the head nail 3, the center rod 4 is inserted. Since the center rod 4 and the head nail groove 3.3 are both rectangular parallelepipeds, the tightening knob 2, the center rod 4 and the head nail 3 form an integrated rotating structure. In this way, the doctor can rotate the center rod 4. The operating end 2.1 of the tightening knob 2 is moved so that the embedding end 3.1 of the head nail 3 is embedded in the skull. In order to reach the protection position, the rod head 4.1 of the center rod 4 is pulled so that the rod body 4.2 of the center rod 4 is disengaged from the head nail groove 3.3 of the head nail 3 and is located in the tightening knob 2. At this time, the rotation of the tightening knob 2 will not drive the rotation of the head nail 3. At this time, the abutting end of the tightening knob 2 is also disengaged from the connecting end 3.2 of the head nail 3. In this way, during the operation, when the medical staff touches the head nail 3, they only touch the operating end 2.1 of the tightening knob 2 or the center rod 4, and at this time, the tightening knob 2 or the center rod 4 has no direct connection with the head nail 3, or in other words, the collision with the tightening knob 2 or the center rod 4 will not be transmitted to the head nail 3, so that the embedding end 3.1 of the head nail 3 will not slide on the scalp surface other than the surgical position, thereby causing complications.

[0033] In another embodiment provided by the present invention, the central rod 4 includes a diamond-shaped bracket 5, such that the central rod 4 is composed of a rod head 4.1, a diamond-shaped bracket 5 and a rod body 4.2 from the top to the bottom, the diamond-shaped bracket 5 includes four connecting rods 5.1 of the same size and shape and four rotating shafts of the same size and shape, the four connecting rods 5.1 are connected end to end through four rotating shafts to form a diamond shape, wherein two rotating shafts are respectively connected to the rod head 4.1 and the rod body 4.2 of the central rod 4, that is, the rotating shaft connecting the rod head 4.1 is the upper rotating shaft 5.2, and the rotating shaft connecting the rod body 4.2 is the lower rotating shaft 5.3, and the diamond-shaped bracket 5 includes a contracted state and an expanded state. In the contracted state, the upper rotating shaft 5.2 and the lower rotating shaft 5.3 are close to each other, and the other two rotating shafts are far away from each other. In the open state, the upper rotating shaft 5.2 and the lower rotating shaft 5.3 are far away from each other, and the other two rotating shafts are close to each other. Preferably, springs such as torsion springs are provided on the four rotating shafts, and the springs are used for elastic reset of the diamond bracket 5 in the contracted state and maintaining the open state, that is, the initial state of the center rod 4 is the open state, and the diamond bracket 5 will maintain the open state after changing from the contracted state to the open state. In the operating position of the tightening knob 2, the diamond bracket 5 is in the tightening state. The diamond bracket 5 is in the knob groove 2.2 of the knob 2. At this time, the diamond bracket 5 will be squeezed by the groove wall of the knob groove 2.2. In the protection position of the tightening knob 2, the diamond bracket 5 is separated from the knob groove 2.2 in the tightening knob 2 to be located outside the knob groove 2.2. That is, at this time, the rod head 4.1 of the center rod 4 is at a distance from the operating end 2.1 of the tightening knob 2, so the probability of touching the center rod 4 is greater than the probability of tightening the knob 2, and when touching the center rod 4, its diamond bracket 5 will change from an open state to a contracted state, and no matter from which direction the center rod 4 is touched, its diamond bracket 5 will eventually be in an open state. In the open state, such arrangement of the diamond-shaped bracket 5 has two advantages. First, when the diamond-shaped bracket 5 touches the center rod 4, it will shrink and will not collide with the head nail 3. Second, since the length of the head nail groove 3.3, the knob groove 2.2 and the center rod 4 can be set, when tightening the knob 2 from the operating position to the protection position, there is a probability that the distance will not be properly controlled so that the rod body 4.2 of the center rod 4 is still in the head nail groove 3.3. In this way, the size design can ensure that when the diamond-shaped bracket 5 is completely out of the knob groove 2.2, the rod body 4.2 of the center rod 4 is also completely out of the head nail groove 3.3, that is, the diamond-shaped bracket 5 can also play a marking role.

[0034] In another embodiment provided by the present invention, the interior of the shaft 4.2 is hollow, so that a locking member can be provided in the shaft 4.2, and the locking member includes a driving member and an abutment plate 10, and the abutment plate 10 is a rectangular plate. Preferably, four abutment plates 10 are provided, and the four abutment plates 10 are arranged at the four ends of a virtual cross star, and the sides of the four abutment plates 10 facing the central axis of the shaft 4.2 are wedge-shaped surfaces, and a groove body that adapts to the abutment plate 10 is provided on the outer wall of the shaft 4.2, and the driving member drives the abutment plate 10 to slide radially from the inside of the shaft 4.2 to the outside of the shaft 4.2 through the groove body, and the driving member includes a pushing rod 9.1 and a pushing block 9.2, and the pushing block 9.2 is located in the central area of ​​the shaft 4.2 The push rod 9.1 is fixedly connected to the push block 9.2. Preferably, a rectangular hole 13 is provided on the rod head 4.1 of the center rod 4. The push rod 9.1 passes through the through holes in the middle of the lower rotating shaft 5.3 and the upper rotating shaft 5.2 and extends into the rectangular hole 13. Preferably, the push rod 9.1 is a T-shaped rod. When the push rod 9.1 slides in the rectangular hole 13, the top of the T-shaped rod will abut against the hole wall of the rectangular hole 13. The radial dimensions of the head nail groove 3.3 and the knob groove 2.2 are first large and then small from the bottom end (the end close to the embedded end 3.1 of the head nail 3) to the top end. A reset mechanism is also provided in the rod shaft 4.2, and the reset mechanism is used to reset to the rod shaft when the abutment plate 10 moves to the outside of the rod shaft 4.2. 4.2, the reset mechanism includes a reset block 11 and an elastic member 12, preferably, the elastic member 12 is a spring, the reset block 11 is fixedly connected to the abutment plate 10, one end of the elastic member 12 is connected to the abutment plate 10, and the other end of the elastic member 12 is connected to the inner wall of the shaft 4.2, the locking member includes an initial state and a locked state, in the initial state, the four abutment plates 10 are all located inside the shaft 4.2, in the locked state, the push rod 9.1 is pushed to make the push block 9.2 move toward the groove wall at the bottom end of the head nail groove 3.3, and the four bottom side surfaces of the push block 9.2 respectively form a wedge-shaped fit with the wedge-shaped surfaces of the four abutment plates 10, at this time, the abutment plate 10 passes through the groove on the shaft 4.2 The body moves radially to the outside of the rod body 4.2, that is, in the operating position, when the abutment plate 10 is in a locked state, the plate wall of the abutment plate 10 abuts against the inner wall of the head nail groove 3.3, so that the locking piece fixes the center rod 4 in the head nail 3, and in the protection position, when the abutment plate 10 is in a locked state, the plate wall of the abutment plate 10 abuts against the inner wall of the knob groove 2.2, and the locking piece fixes the center rod 4 in the tightening knob 2. The purpose of arranging a locking piece on the center rod 4 is that when the doctor selects different force points, the tightening knob 2 and the head nail 3 are likely to be in a tilted state, so a locking piece can also reduce the probability of the tightening knob and the head nail 3 falling off due to tilting.

[0035] In another embodiment provided by the present invention, a shock-absorbing member is arranged on the plate wall of the four abutment plates 10, and the plate wall is a side wall of the abutment plate 10 close to the inner wall of the head nail 3 in the locked state. Preferably, the shock-absorbing member includes a rubber strip 14, and the shock-absorbing member is used to achieve soft contact between the abutment plate 10 and the inner wall of the head nail 3 and the inner wall of the abutment plate 10. In the initial state, the four rubber strips 14 and the four abutment plates 10 are all located in the rod body 4.2. In the locked state, the rubber strip 14 and the plate wall of the abutment plate 10 are all located in the head nail groove 3.3. When the center rod 4 is inserted into the head nail groove 3.3, when the rod body 4.2 of the center rod 4 collides with the groove wall of the head nail groove 3.3, the force generated by the collision will be transmitted to the head nail 3. In this way, the role of arranging the shock-absorbing member on the abutment plate 10 is to reduce the force generated by the collision by arranging the rubber sheet to reduce the damage of the head nail 3 to the skull.

[0036] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A neurosurgery cranial fixation device, comprising a C-shaped fixing frame, on which a plurality of head nails are screwed, characterized in that: It also includes a plurality of tightening knobs corresponding to the head nails one by one, the head nail includes a connecting end and an embedding end, the tightening knob has an operating position connected to the connecting end and a protection position fixed to the C-shaped fixing frame, and also includes a center rod, in the operating position, one end of the center rod passes through the tightening knob and is inserted into the head nail, the tightening knob drives the head nail to rotate, in the protection position, the center rod is separated from the head nail, the center rod includes a rod head and a rod body, the rod body is a rectangular parallelepiped, a locking piece is arranged in the rod body, in the operating position, the locking piece fixes the center rod in the head nail, and in the protection position, the locking piece fixes the center rod in the tightening knob; the center rod includes a rhombus bracket, so that the center rod is composed of a rod head, a rhombus bracket and a rod body from the top to the bottom, the rhombus bracket includes four connecting rods of the same size and shape and four rotating shafts of the same size and shape, the four connecting rods are connected end to end through four rotating shafts to form a rhombus, wherein two rotating shafts are respectively connected to the rod head and the rod body of the center rod; In the operating position of the tightening knob, the diamond-shaped bracket is in the knob groove of the tightening knob, and the diamond-shaped bracket is squeezed by the groove wall of the knob groove. In the protection position of the tightening knob, the diamond-shaped bracket is separated from the knob groove in the tightening knob to be located outside the knob groove; A locking member is arranged in the shaft, and the locking member includes a driving member and an abutment plate. The abutment plate is a rectangular plate, and is provided with four abutment plates. The four abutment plates are arranged at the four ends of a virtual cross star, and the sides of the four abutment plates facing the central axis of the shaft are wedge-shaped surfaces. A groove body adapted to the abutment plate is arranged on the outer wall of the shaft, and the driving member drives the abutment plate to slide radially from the inside of the shaft to the outside of the shaft through the groove body. The driving member includes a pushing rod and a pushing block, and the pushing block is located in the central area of ​​the shaft, and the pushing rod is fixedly connected to the pushing block. A rectangular hole is arranged on the rod head of the central rod, and the pushing rod is a T-shaped rod. When the pushing rod slides in the rectangular hole, the top end of the T-shaped rod abuts against the hole wall of the rectangular hole.

2. The neurosurgery cranial fixation device according to claim 1, characterized in that: The number of the head nails is three.

3. The neurosurgery cranial fixation device according to claim 1, characterized in that: The central rod includes a diamond-shaped bracket, and the diamond-shaped bracket includes a contracted state and an expanded state. In the operating position, the diamond-shaped bracket is in the expanded state, and in the protection position, the diamond-shaped bracket is in the contracted state.

4. The neurosurgery cranial fixation device according to claim 1, characterized in that: The locking member comprises a driving member and an abutment plate, wherein the abutment plate is mounted on the outer wall of the central rod, the driving member is connected to the abutment plate, and the driving member is used to drive the abutment plate to move radially.

5. The neurosurgery cranial fixation device according to claim 4, characterized in that: A shock absorbing member is arranged on the plate wall of the abutting plate, and the shock absorbing member is used to achieve soft contact between the abutting plate and the inner wall of the stud and the inner wall of the abutting plate.

6. The neurosurgery cranial fixation device according to claim 5, characterized in that: The shock absorbing member comprises a rubber strip.

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