CN217408872U

CN217408872U - Multifunctional cervical vertebra bidirectional retractor

Info

Publication number: CN217408872U
Application number: CN202221239894.6U
Authority: CN
Inventors: 程涛
Original assignee: Individual
Current assignee: Individual
Priority date: 2022-05-23
Filing date: 2022-05-23
Publication date: 2022-09-13
Anticipated expiration: 2032-05-23

Abstract

The utility model relates to the technical field of surgical instruments, in particular to a multifunctional cervical vertebra bidirectional retractor. Comprises a support rod, a fixed rod and a movable rod; the support rod is provided with a scale mark identification part with brightness; the upper end of the movable rod is sleeved with the support rod and can move relatively through the driving structure; the movable rod and the fixed rod have the same structure and comprise a first connecting part and a second connecting part, and the included angle between the first connecting part and the second connecting part is 145-165 degrees; the bottom end of the second connecting part is provided with a fixing hole and a nail rod; supporting blade structures are arranged on the second connecting parts of the movable rod and the fixed rod, and the two supporting blade structures are symmetrically arranged around the supporting rod; the blade supporting structure comprises a telescopic rod and blades; one end of the telescopic rod is connected with the second connecting part, and the other end of the telescopic rod is connected with the blade. The utility model discloses a can lead out soft tissue all around simultaneously at the operation in-process, guaranteed about the strength uniformity that the blade propped open the soft tissue, improved the security of operation field of vision space and operation.

Description

Multifunctional cervical vertebra bidirectional retractor

Technical Field

The utility model relates to the technical field of surgical instruments, in particular to a multifunctional cervical vertebra bidirectional retractor.

Background

In the process of cervical vertebra operation, a cervical vertebra retractor is often used, and the cervical vertebra retractor is a common surgical instrument which is used for pricking an upper vertebral body and a lower vertebral body by using nails connected with two end parts, and then opening soft tissues so as to be convenient for subsequent treatment. Further, the operation for cervical spondylosis can be divided into an anterior approach and a posterior approach according to the path of the operation. The posterior surgery is more convenient and faster, and the surgery visual field is larger, but the decompression curative effect on the front of the cervical vertebra is poorer; the difficulty and risk of anterior cervical surgery are relatively high, the operable space is small, the inner side is high, the outer side is low, and the number of surrounding important organ tissues is large. Also, in the operation, it is required to be retracted to both sides by the same distance from the skin, subcutaneous tissue, muscle, vascular sheath, esophagus, trachea, and long neck muscle, etc. to expose an operable space for the operation. And the cervical vertebra retractor of the prior art has single function, can not retract surrounding tissues in the operation reasonably and efficiently, and further can not meet the requirement of reasonable and effective operation visual field, and the safety of operation is seriously influenced.

Disclosure of Invention

The utility model provides a multi-functional cervical vertebra bidirectional retractor to cervical vertebra retractor function singleness among the prior art who solves the above-mentioned existence can only lead out centrum or soft tissue on single upper and lower direction, can't realize leading out soft tissue all around, can't realize strutting the technical problem that soft tissue strength is inconsistent, lead to the operation field of vision is restricted and the operational safety reduces about going up in upper and lower, controlling the direction.

The utility model discloses a two-way retractor of multi-functional cervical vertebra adopts following technical scheme:

a multifunctional cervical vertebra bidirectional retractor comprises a support rod, a fixed rod and a movable rod; the support rods are horizontally distributed left and right and are provided with scale mark identification parts; the fixed rod is vertically connected with the supporting rod and extends downwards; the upper end of the movable rod is sleeved with the support rod and can move relative to the support rod through a driving structure, and the movable rod and the fixed rod are always parallel; the movable rod and the fixed rod have the same structure and respectively comprise a first connecting part and a second connecting part, the first connecting part is connected with the support rod, and the second connecting part is vertically distributed; and the included angle between the first connecting part and the second connecting part is 120-150 degrees; the bottom end of the second connecting part is provided with a fixing hole, and a nail rod with an adaptive structure is arranged in the fixing hole; the nail rod is connected with the fixing hole through a strong magnet block, so that the nail rod can be freely installed and detached; supporting blade structures are arranged on the second connecting parts of the movable rod and the fixed rod, and the two supporting blade structures are symmetrically arranged around the supporting rod; the blade supporting structure comprises a telescopic rod and blades; the blades are preferably of arc convex surface structures; one end of the telescopic rod is connected with the second connecting part, and the other end of the telescopic rod is connected with the blade, so that the blade can move back and forth and prop open soft tissues.

Preferably, the driving structure comprises a moving block, a rack plate, a rotating shaft, a gear and a knob; the moving block is sleeved on the support rod and fixedly connected with the moving rod, and the moving block and the support rod can only horizontally move along the support rod; the inner part of the moving block is of a cavity structure; the rack plate is arranged on the upper end face of the supporting rod; the rotating shaft is rotatably arranged in the moving block; the gear is sleeved on the rotating shaft and is always in meshed transmission with the rack plate; the knob sets up in the outer end of pivot, and is equipped with antiskid portion.

Further preferably, a fastening bolt is further provided on the moving block to fasten the gear when the moving rod moves to a predetermined position.

Preferably, the telescopic rods are connected with the moving rod in a sliding mode, the telescopic rods are fixedly connected with the blades, and the corresponding telescopic rods are further provided with scale marks; so that the telescopic rod rotates to drive the moving blade to move back and forth; and one end of the telescopic rod, which is far away from the blade, is also provided with a pushing block.

Preferably, the fixed rod and the movable rod are respectively provided with a rotatable adjusting rod, so that the adjusting rod can rotate and move inwards to fasten the telescopic rod.

Preferably, the lower end of the blade is further provided with an arc-shaped extension plate, the extension plate is smoothly connected with the blade, and an included angle between the extension plate and the blade is kept to be 90-135 degrees.

Preferably, the left end and the right end of the blade are also provided with auxiliary push pieces with concave arc structures.

Preferably, the blade is also provided with a plurality of uniformly distributed meshes, and the diameter of each mesh is 10-20 microns.

Preferably, the distance between the connecting point of the telescopic rod and the movable rod and the bottom end of the fixing hole is 3-4 mm.

Preferably, the nail rod comprises a threaded drill bit, a connecting part and a rod body which are sequentially distributed from bottom to top; and the connecting part is of a regular hexagon structure; the length of the threaded drill bit is 1.2-2 cm; the length of the rod body is 6-10 cm.

The utility model has the advantages that:

1. the device is provided with a fixed rod, a movable rod and a nail rod; the reasonable and efficient retraction between the upper vertebral body and the lower vertebral body is realized in the anterior cervical operation process, and the distraction distance between the two nail rods is convenient to observe by arranging the scale mark identification part; the movable rod is conveniently and quickly driven to move by arranging the driving structure, the fixed rod is fastened in position, the movable rod is shifted and retracted, the movable rod is kept in an overall outward layout design by arranging the own 120-degree included angle bending structures of the movable rod and the fixed rod, and the knob provided with the manual mode driving structure is arranged on one side away from the movable rod, so that the practicability of the operation nailing and manual knob rotating retracting operation of the device is improved; the use and retraction precision of the retractor is greatly improved;

2. the device is further provided with a threaded drill bit which is convenient to drill into a vertebral body, the rod body is arranged so as to be convenient to realize the connection with the retractor main body, and the regular hexagonal connecting part is arranged so as to be convenient for integrally screwing the threaded drill bit into the vertebral body through external auxiliary equipment; the nail rod is further arranged to be adsorbed and fastened with the strong magnet blocks arranged at the bottoms of the fixing holes, the adsorption force between the strong magnet blocks is large enough, the installation and the disassembly are convenient, the connection and installation stability of the nail rod is improved, and the use safety of the device is further improved;

3. the device is further provided with two supporting leaf structures on the movable rod and the fixed rod respectively, and the two supporting leaf structures are symmetrically arranged around the supporting rod; one of the supporting leaf structures is arranged on the fixed rod, the other supporting leaf structure is arranged on the movable rod, and the two blades can synchronously move back and forth in the direction shown in the figure by rotating the two telescopic rods, so that the force of the two blades for supporting the surrounding soft tissues is consistent; the balance is ensured, and the operation efficiency of the subsequent operation visual field space is further ensured; in the initial state, the blades are close to the fixed rod, and the distance between the two blades is minimum, so that the blades can be conveniently inserted into soft tissues of an affected part needing to be retracted in an operation; in the cervical vertebra operation process, two nail poles of cervical vertebra strut two upper and lower centrums, and two prop leaf structures and strut the soft tissue of left and right sides direction, and then form about will, soft tissue all around is all retracted, simultaneously at the in-process of retracting, still is equipped with the mesh on the blade, on the basis of guaranteeing to strut soft tissue around, has guaranteed the high efficiency of good permeability and blade aversion, has further improved the field of vision space and the operational safety that the anterior cervical vertebra operation needs.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.

FIG. 1 is a perspective view of the overall structure of the present invention;

FIG. 2 is a top view of a blade of the present invention;

FIG. 3 is a structural diagram of the telescopic rod of the present invention

Fig. 4 is a schematic view of a driving structure of the present invention;

fig. 5 is a schematic view of the partial explosion of the nail rod of the present invention.

In the figure: 1. a support bar; 2. fixing the rod; 3. a travel bar; 4. a scale mark identification part; 5. a drive structure; 61. a first connection portion; 62. a second connecting portion; 63. a fixing hole; 64. a strong magnet block; 7. a nail rod; 71. a thread drill bit; 72. a rod body; 73. a connecting portion; 8. a leaf supporting structure; 81. a telescopic rod; 82. a blade; 83. an auxiliary push sheet; 84. adjusting a rod; 85. a stretching plate; 91. a moving block; 92. a rack plate; 93. a rotating shaft; 94. a gear; 95. a knob; 96. fastening the bolt; 10. and (4) meshes.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that unless otherwise explicitly stated or limited, the terms "mounted," "connected" and "disposed" are to be construed broadly, and may for example be fixedly connected, disposed, detachably connected, disposed, or integrally connected and disposed. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Example 1: as shown in fig. 1-5:

a multifunctional cervical vertebra bidirectional retractor comprises a support rod 1, a fixed rod 2 and a movable rod 3. The supporting rods 1 are horizontally distributed left and right and are provided with scale mark identification parts 4, so that a main doctor can observe the cervical vertebra retracting distance conveniently in the operation process. The fixing rod 2 is vertically connected with the supporting rod 1 and extends downwards. As shown in fig. 1: dead lever 2 and carriage release lever 3 homonymy just are located the front side of bracing piece 1, and drive structure 5's knob 95 is located the opposite side of bracing piece 1, is convenient for in cervical vertebra operation process, rotates the operation of knob 95 and then drives the carriage release lever 3 and remove.

The upper end of the movable rod 3 is sleeved with the support rod 1 and keeps the relative movement of the movable rod and the support rod through the driving structure 5, the movable rod 3 and the fixed rod 2 are always parallel, and the balance of the cervical vertebra body is guaranteed to be retracted. In the present embodiment, the driving structure 5 includes a moving block 91, a rack plate 92, a rotating shaft 93, a gear 94, and a knob 95; the moving block 91 is sleeved on the support rod 1 and is fixedly connected with the moving rod 3, and the moving block 91 and the support rod 1 are kept to move horizontally only along the support rod 1. The moving block 91 is in a ring structure, and the inside of the moving block 91 above the supporting rod 1 is in a cavity structure.

The rack plate 92 is provided on the upper end surface of the support rod 1; the rotating shaft 93 is rotatably arranged in the moving block 91; the gear 94 is sleeved on the rotating shaft 93, and the gear 94 is always kept in meshed transmission with the rack plate 92; knob 95 sets up in the outer end of pivot 93, and is equipped with antiskid portion, and knob outside edge still is equipped with the handle, is convenient for through rotating handle operation, and is more powerful, drives gear revolve, and then drives the centrum and struts. In this embodiment, the knob 95 can also be driven by rotating blades, and the rotating blades are vertically connected to the rotating shaft 93, i.e. the rotating blades are operated to rotate to drive the gear 94 to rotate. A fastening bolt 96 is further disposed on the moving block 91, so that when the moving rod 3 moves to a preset position, the fastening bolt 96 is rotated to move inwards to contact with the side wall of the gear 94 and fasten the gear 94, thereby forming a locking structure, and preventing the moving rod 3 from moving backwards after being spread. So set up, improved the degree of accuracy that the carriage release lever 3 removed and retracted greatly.

The retractor is provided with a fixed rod 2, a movable rod 3 and a nail rod 7; the reasonable and efficient retraction between the upper and lower vertebral bodies through the nail rods 7 (the direction is shown as the left and right direction in figure 1, namely the extending direction of the support rod 1) in the anterior cervical vertebra operation process is realized, and the retraction distance between the two nail rods 7 is convenient to observe by setting the scale mark identification part 4, which is used as a first weight indication retraction distance. Further drive carriage release lever 3 through setting up drive structure 5 convenient and fast ground and remove, realize that dead lever 2 position is set up, the aversion of carriage release lever 3 is led out to knob 95 through manual mode drive structure 5 or rotate the flabellum, realize the leading out of centrum, improved the device operation nail and gone into, the manual practicality that leads out the operation.

In this embodiment, still be equipped with protruding mark on the knob 95, correspond knob 95 department at 1 lateral wall of bracing piece and still be equipped with four draw-in groove marks that the annular distributes, the main doctor still can be according to corresponding index mark and corresponding position, at the in-process of rotating the knob, can reachd the displacement of carriage release lever through perception and record knob pivoted number of turns, and then reachs fast and the accurate appointed interval of cervical vertebra centrum is led out in realization.

The movable rod 3 and the fixed rod 2 have the same structure and respectively comprise a first connecting part 61 and a second connecting part 62, wherein the first connecting part 61 is connected with the support rod 1 and is obliquely distributed, and the second connecting part 62 is vertically distributed. The pitch of the first connecting portion 61 and the second connecting portion 62 is a transitional arc structure, and the included angle between the first connecting portion 61 and the second connecting portion 62 is 145 degrees and 165 degrees. So set up, through setting up the respective holistic 145 of movable rod 3 and dead lever 2 and adding 165 degrees contained angles bending structures, keep the design of the whole outward overall arrangement of two poles, at the operation in-process, be convenient for the main doctor to observe the visual field space of operation, can not cause too big sheltering from.

The bottom end of the second connecting portion 62 is provided with a fixing hole 63, a nail rod 7 with an adaptive structure is installed in the fixing hole 63, and in the embodiment, the nail rod 7 comprises a threaded drill bit 71, a rod body 72 and a connecting portion 73 which are sequentially distributed from bottom to top; the thread drill bit 71 is arranged at the lowest part of the nail rod; the connecting portion 73 is arranged in the middle, the connecting portion 73 is of a regular hexagon structure, the rod body is arranged at the upper end, and the connecting portion, the connecting portion 73 and the rod body are integrally formed. In the operation process, a main doctor firstly sleeves the connecting part through an external rotating tool, drills the nail rod into the corresponding vertebral body, and then correspondingly installs the nail rod at the corresponding position on the fixed rod and the movable rod of the retractor, wherein the thread drill bit completely enters the vertebral body.

In this embodiment, the length of the auger bit 71 is 1.2-2 cm; the length of the rod body 72 is 6-10 cm. The nail rod 7 preferably adopts a cylindrical structure; further through setting up nail pole 7 and dead lever 2 and the connecting portion of carriage release lever 3 for cylindrical appearance design, the purpose has played good direction installation effect, and it is more convenient to install. And the nail rod 7 is connected with the fixing hole 63 through a strong magnet block 64, so that the nail rod 7 can be freely installed and detached. Further still set up nail pole 7 and fixed orifices 63 bottom and set up strong magnet piece 64 and adsorb and fasten, the adsorption affinity between strong magnet piece 64 is enough big, is convenient for install and dismantle, has improved the steadiness that the installation is connected to nail pole 7.

The second connecting parts 62 of the movable rod 3 and the fixed rod 2 are provided with the supporting leaf structures 8, and the two supporting leaf structures 8 are symmetrically arranged around the supporting rod 1. The supporting blade structure 8 includes a telescopic rod 81 and a blade 82. In the present embodiment, the vanes 82 are preferably arcuate convex surface structures; the vanes 82 may also be planar in configuration. One end of the expansion link 81 is connected to the second connecting portion 62, and the other end is connected to the blade 82. In this embodiment, in order to ensure the symmetry of the two blades 82, the connection point of the telescopic rod and the blades is not located on the central axis of the blades; i.e. an eccentric structure will be formed. Furthermore, a rectangular frame is further provided at the center of the inner side of the blade 82 for reinforcement, so that the blade 82 can move forward and backward and open soft tissues with equal external force. The blade 82 is also provided with a plurality of uniformly distributed meshes 12, and the diameter of each mesh 12 is 10-20 microns. The blades 82 have a height of 5-20cm and a bottom end flush with the bottom end of the travel bar 3. The distance between the connection point of the telescopic rod 81 and the movable rod 3 and the innermost end of the fixed hole 63 is 3-4 mm. The rotation of the telescopic rod 81 and the nail rod 7 are ensured not to interfere with each other.

The telescopic rod 81 is connected with the moving rod 3 in a sliding way, so that the telescopic rod 81 rotates to drive the moving blade 82 to move back and forth; the telescopic rods 81 are fixedly connected with the blades 82, and the corresponding telescopic rods 81 are also provided with scale marks; the scale lines are arranged so that the master doctor can observe the moving and opening distance of the blades conveniently. The telescopic rod 81 adopts an integrally formed structure, is convenient to disassemble, and can be fastened and positioned through the adjusting rod in the operation process; after the operation, loosen the regulation pole, can dismantle blade and telescopic link are whole, more have the practicality.

Rotatable adjusting rods 84 are further provided on the fixed rod 2 and the movable rod 3, respectively, so that the adjusting rods 84 are rotated and moved inward to fasten the telescopic rod 81. Taking the structure of the fixing rod 2 as an example, the adjusting rod 84 is located on the same horizontal plane as the fixing rod 2 and the telescopic rod 81. When the telescopic rod 81 moves to a preset position, namely after the opening area of the blades is preset, the adjusting rod 84 is rotated to move inwards and push against the side wall of the telescopic rod, so that the fixing operation is completed. So set up, convenient and fast more has the practicality.

The lower end of the blade 82 is also provided with an arc-shaped extension plate 85, and the extension plate 85 is smoothly connected with the blade 82 and keeps an included angle of 90-135 degrees. So set up, be convenient for to pushing away the soft tissue of bottom, realize better retractor effect. Auxiliary push pieces 83 with concave arc structures are arranged at the left end and the right end of the blade 82. In this embodiment, the auxiliary pushing plate 83 may also be a convex structure or a plane structure for preventing soft tissue or tissue fluid in the direction of the supporting rod from entering the internal cavity of the retractor.

Further, supporting blade structures 8 are respectively arranged on the movable rod 3 and the fixed rod 2, and the two supporting blade structures 8 are symmetrically arranged around the supporting rod 1; and one of the supporting leaf structures 8 is arranged on the fixed rod 2, and the other supporting leaf structure 8 is arranged on the movable rod 3. Through the operation of rotating two telescopic links 81 simultaneously for two blades 82 can move back and forth in step in the direction of the figure, guarantee that two blades 82 will be around the soft tissue strut the power of soft tissue unanimously, guarantee the balance, and then guarantee the operation high efficiency in follow-up operation field of vision space.

In an initial state, the telescopic rod 81 is close to the fixed rod 2 or the movable rod 3, and the distance between the two blades 82 is the minimum, so that the telescopic rod can be conveniently inserted into soft tissues of an affected part needing to be retracted in an operation; in the cervical vertebra operation process, two nail rods 7 of cervical vertebra insert the centrum and strut two upper and lower centrums, and two prop leaf structures 8 and strut the soft tissue of left and right direction, and then form and lead out upper and lower, left and right soft tissue all around, have improved the visual field space and the operation security that the anterior cervical vertebra operation needs.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A multifunctional cervical vertebra bidirectional retractor is characterized in that: comprises a support rod (1), a fixed rod (2) and a movable rod (3); the support rods (1) are horizontally distributed and are provided with scale mark identification parts (4); the fixed rod (2) is vertically connected with the supporting rod (1) and extends downwards; the upper end of the movable rod (3) is sleeved with the support rod (1) and can move relatively through a driving structure (5), and the movable rod (3) and the fixed rod (2) are always parallel; the movable rod (3) and the fixed rod (2) are identical in structure and respectively comprise a first connecting part (61) and a second connecting part (62), the first connecting part (61) is connected with the support rod (1), and the second connecting parts (62) are vertically distributed; and the included angle between the first connecting part (61) and the second connecting part (62) is 120 DEG and 150 DEG; the bottom end of the second connecting part (62) is provided with a fixing hole (63), and a nail rod (7) with an adaptive structure is arranged in the fixing hole (63); the nail rod (7) is connected with the fixing hole (63) through a strong magnet block (64), so that the nail rod (7) can be freely installed and detached; supporting blade structures (8) are arranged on the second connecting parts (62) of the movable rod (3) and the fixed rod (2), and the two supporting blade structures (8) are symmetrically arranged around the supporting rod (1); the leaf supporting structure (8) comprises a telescopic rod (81) and a blade (82); one end of the telescopic rod (81) is connected with the second connecting part (62), and the other end of the telescopic rod is connected with the blade (82), so that the blade (82) can move back and forth and prop open soft tissues.

2. The multifunctional cervical bidirectional retractor according to claim 1, wherein: the driving structure (5) comprises a moving block (91), a rack plate (92), a rotating shaft (93), a gear (94) and a knob (95); the moving block (91) is sleeved on the support rod (1) and is fixedly connected with the moving rod (3), and the moving block (91) and the support rod (1) can only horizontally move along the support rod (1); the inner part of the moving block (91) is of a cavity structure; the rack plate (92) is arranged on the upper end surface of the support rod (1); the rotating shaft (93) is rotatably arranged in the moving block (91); the gear (94) is sleeved on the rotating shaft (93), and the gear (94) and the rack plate (92) are always kept in meshed transmission; the knob (95) is arranged at the outer end of the rotating shaft (93) and is provided with an anti-skid part.

3. The multifunctional bidirectional cervical vertebra retractor according to claim 2, wherein: a fastening bolt (96) is further arranged on the moving block (91) so as to fasten the gear (94) when the moving rod (3) moves to a preset position.

4. The multifunctional cervical bidirectional retractor according to claim 1, wherein: the telescopic rods (81) are connected with the moving rod (3) in a sliding mode, the telescopic rods (81) are fixedly connected with the blades (82), and the corresponding telescopic rods (81) are further provided with scale marks; so that the telescopic rod (81) rotates to drive the blade (82) to move back and forth.

5. The multifunctional cervical bidirectional retractor according to claim 4, wherein: the fixed rod (2) and the movable rod (3) are respectively provided with a rotatable adjusting rod (84) so that the adjusting rod (84) rotates and moves inwards and the telescopic rod (81) is fastened.

6. The multifunctional cervical bidirectional retractor according to claim 1, wherein: auxiliary push pieces (83) with concave arc structures are arranged at the left end and the right end of the blade (82).

7. The multifunctional cervical bidirectional retractor according to claim 1, wherein: the lower end of the blade (82) is also provided with an arc-shaped extension plate (85), the extension plate (85) is smoothly connected with the blade (82) and an included angle between the extension plate and the blade is kept to be 90-135 degrees.

8. The multifunctional cervical bidirectional retractor according to claim 1, wherein: the blades (82) are also provided with a plurality of uniformly distributed meshes (10), and the diameters of the meshes (10) are 10-20 micrometers.

9. The multifunctional cervical bidirectional retractor according to claim 1, wherein: the distance between the connection point of the telescopic rod (81) and the movable rod (3) and the innermost end of the fixed hole (63) is 3-4 mm.

10. The multifunctional bidirectional cervical vertebra retractor according to claim 1, wherein: the nail rod (7) comprises a threaded drill bit (71), a connecting part (73) and a rod body (72) which are sequentially distributed from bottom to top; the connecting part (73) is of a regular hexagon structure; the length of the thread drill bit (71) is 1.2-2 cm; the length of the rod body (72) is 6-10 cm.