CN215651472U - Self-drilling headless hollow screw device system - Google Patents

Self-drilling headless hollow screw device system Download PDF

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Publication number
CN215651472U
CN215651472U CN202121331876.6U CN202121331876U CN215651472U CN 215651472 U CN215651472 U CN 215651472U CN 202121331876 U CN202121331876 U CN 202121331876U CN 215651472 U CN215651472 U CN 215651472U
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China
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self
drilling
screw
screwdriver
device system
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Inventor
姚力军
张桐滨
张茜垚
何强龙
王凌
诸楠
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Ningbo Zhaoying Medical Instrument Co ltd
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Ningbo Zhaoying Medical Instrument Co ltd
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Abstract

The utility model provides a self-drilling headless hollow screw device system, which comprises a screw body and a screwdriver, wherein the screw body is provided with a screw hole; the screw body comprises a screw rod and a self-drilling groove along the direction from the head to the tail; the head of the screw rod is provided with an inwards-recessed windmill-shaped inner hexagonal flower-shaped drive; the self-drilling groove and the screw rod are fixedly connected into a whole; the self-drilling groove and the screw rod are positioned on the same axis. The self-drilling headless hollow screw device system provided by the utility model has the advantages that the screw body is provided with the self-drilling groove with the four-edge self-drilling structure, and the self-drilling groove can directly enter a bone without a bone drill; possess windmill shape hexagon socket head flower shape drive, strengthened the torsional properties that corresponds the screwdriver, avoided the screwdriver to take place to fracture in the use.

Description

Self-drilling headless hollow screw device system
Technical Field
The utility model belongs to the technical field of medical instruments, relates to an orthopedic surgery, and particularly relates to a self-drilling headless hollow screw device system.
Background
Bone fractures are one of the common injuries and the treatment of bone fractures is divided into conservative and surgical treatments. If the tube-shaped plaster is preserved for fixation, the fixation time is long, and the wrist joint can be rigid due to long-term fixation; and the fixing effect is not reliable. With scientific progress and improvement of the cognition level, many fractures need to be treated by internal fixation through an operation method, and the treatment effects of satisfactory reduction and good limb functions are achieved. Many treatments are temporary fixation of the fracture with a k-nail, followed by half-thread cancellous screws, and may also be combined with tension bands. The ideal treatment requires reliable fixation and minimizes trauma due to surgically separated tissue, but due to the complex morphology of the human skeleton and the complex mechanisms of injury, some fractures do not achieve satisfactory results. Accordingly, there is a need for improvements in intra-operative fixation implants. Surgical fixation requires good internal fixation implants.
The hollow screw plays a great role in treating the fracture, is usually made of titanium alloy materials with good biocompatibility, achieves a good fixing effect through a simple operation, and provides a simple, accurate and reliable solution for doctors to treat the fracture or perform fusion and osteotomy operations.
The head of the existing headless pressurizing hollow screw is self-drilled with a groove, the tail of the existing headless pressurizing hollow screw is driven to be in a hexagon socket or hexagon socket flower shape, and the tooth shape of the rod part is a symmetrical tooth shape. The head self-tapping structure, the product can not directly enter into the sclerotin, the bone drill is needed to open the implantation channel of the screw, the operation time is increased, and the bone drill is an apparatus. Due to the limitation of the hollow structure and the tail drive, the structure of the matched instrument is fixed to be a hollow hexagonal or hollow hexagonal flower-shaped structure, and the fracture event of the instrument is often generated in the using process. The rod tooth shape is a symmetrical tooth shape, and the problem of insufficient holding force on sclerotin exists.
CN 211094619U discloses a novel locking hollow screw for femoral neck fracture, the hollow screw includes integrated into one piece's main part, main part axle center department is formed with the through-hole, the main part includes first pole portion and second pole portion along axial connection, first pole portion diameter is greater than second pole portion diameter, the one end that first pole portion and second pole portion kept away from each other is formed with first screw thread and second screw thread respectively, first pole portion inserts the position of keeping away from the femoral head and passes through the femoral head of second threaded connection. The hollow screw needs to be connected with the positions of two ends of the femur through the two rod parts in the using process, so that the operation steps are increased, and the operation difficulty is increased.
CN 210990661U discloses a novel headless hollow forcing screw, which comprises a rod part and a thread formed on the outer surface of the rod part, wherein a hollow through hole is formed in the axis of the rod part, a screw tip is formed at one end of the rod part, a notch for connecting a rotating instrument is formed, and the screw tip is in a self-tapping design; the thread pitch of the thread is gradually reduced from the nail tip to the notch; the diameter of the rod part gradually decreases from the nail tip to the notch and then gradually increases; a plurality of cutting edges are uniformly distributed around the nail tip. The novel headless hollow compression screw needs to be drilled and tapped along the guide pin in the using process, then the screw is sleeved into the guide pin, and the screw is screwed into a bone by using a special instrument (matched with the notch 150). The adoption of the headless hollow compression screw still needs to drill bones, and the operation process is complicated and difficult.
CN 204890156U discloses a self-tapping and self-drilling cortical bone screw having a screw head and a screw rod; the head of the screw is connected with the screw head; the circumferential surface of the screw is provided with cortical bone threads, and the tail end of the screw is of a three-cutting-edge tip structure; the top of the screw head is provided with a hexagon socket; the screw head is spherical. The self-tapping and self-drilling cortical bone screw is driven by the inner hexagon, and the screwdriver applying driving force to the screw in the operation process is broken, so that the medical instrument is damaged, the operation difficulty is increased, and the pain of a patient is increased.
In summary, the currently available headless hollow screws cannot directly enter the bone, and a bone drill is required to open the implant channel of the screw, increasing the operation time and instruments. Therefore, it is one of the problems to be solved in the art to provide a hollow screw capable of being directly implanted into bone, which can increase the convenience of operation and reduce the operation time.
SUMMERY OF THE UTILITY MODEL
Aiming at the defects in the prior art, the utility model aims to provide a self-drilling headless hollow screw device system, which comprises a self-drilling headless hollow screw, wherein the self-drilling headless hollow screw is provided with a self-drilling groove with a four-blade self-drilling structure and can directly enter a bone; the thread with a shallow thread form can provide stronger holding force for sclerotin, and also has windmill-shaped inner hexagonal flower-shaped driving, so that the torsion performance of corresponding medical instruments is enhanced; the screwdriver is matched with the self-drilling headless hollow screw for use, has stronger torsion performance, and avoids the screwdriver from being broken in the using process.
In order to achieve the purpose, the utility model adopts the following technical scheme:
the utility model provides a self-drilling headless hollow screw device system, which comprises a screw body;
the screw body comprises a screw rod and a self-drilling groove along the direction from the head to the tail;
the head of the screw rod is provided with an inwards-recessed windmill-shaped inner hexagonal flower-shaped drive;
the self-drilling groove and the screw rod are fixedly connected into a whole;
the self-drilling groove and the screw rod are positioned on the same axis.
The self-drilling headless hollow screw device system provided by the utility model comprises a screw book. The screw body can directly enter a bone without a bone drill; the screw body is driven in a windmill-shaped inner hexagonal flower shape.
The structural strength of the screw driver for orthopedics department is in direct proportion to the driving sectional area, and the larger the sectional area is, the higher the driving strength of the screw driver is. The common drives at present are an inner hexagonal drive and an inner hexagonal flower-shaped drive, the cross sections of the inner hexagonal drive and the inner hexagonal flower-shaped drive are small, and instrument fracture events are easy to occur in the using process. The windmill-shaped inner hexagon flower-shaped driver is adopted, the sectional area of the windmill-shaped inner hexagon flower-shaped driver is higher than the existing driving sectional area, the torsion performance of the screwdriver is enhanced, and the occurrence of fracture of the screwdriver in the operation process is avoided.
Preferably, the screw rod has a diameter gradually decreasing in a head-to-tail direction.
Preferably, the diameter of the head of the screw is 2.8-7mm, for example 2.8mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm or 7mm, but not limited to the values listed, and other values not listed in the numerical range are equally applicable.
The screw has a tail diameter of 2.5-6.5mm, such as 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm or 6.5mm, but not limited to the values listed, and other values not listed in the range of values are equally applicable.
Preferably, the length of the screw rod is 8-130mm, for example 8mm, 10mm, 16mm, 20mm, 40mm, 50mm, 70mm, 80mm, 100mm, 120mm or 130mm, but is not limited to the values listed, and other values not listed in the range of values are equally applicable.
Preferably, the thread on the threaded rod is a shallow thread type thread.
The shallow thread profile thread comprises an HA shallow thread profile thread.
Preferably, the thread pitch of the shallow thread form thread is 0.3-3mm, for example 0.3mm, 0.5mm, 1.0mm, 1.5mm, 2.0mm, 2.5mm or 3.0mm, but not limited to the values recited, and other values not listed in the numerical range are equally applicable.
Preferably, the shallow thread profile thread has a depth of 0.3 to 1.0mm, which may be, for example, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm or 1.0mm, but is not limited to the values recited, and other values not recited within the range of values are equally applicable.
The shallow thread type thread provided by the utility model is an asymmetric thread, the flank angle of the working surface of the thread is 20-45 degrees, and the flank angle of the non-working surface is 3-20 degrees. The shallow thread type thread provided by the utility model has a larger holding area for bone substances and a larger friction coefficient, thereby providing stronger holding force for the bone substances.
Preferably, the structure of the self-drilling groove is a four-edge self-drilling structure.
Preferably, the length of the self-drilling grooves is 3-5mm, and may be, for example, 3mm, 3.2mm, 3.4mm, 3.6mm, 3.8mm, 4mm, 4.2mm, 4.4mm, 4.6mm, 4.8mm or 5mm, but is not limited to the values recited, and other values not recited within the range of values are equally applicable.
The equivalent diameter of the self-drilling grooves is 1.9-4.5mm, and may be, for example, 1.9mm, 2mm, 2.3mm, 2.8mm, 3.3mm, 3.8mm, 4.2mm or 4.5mm, but is not limited to the recited values, and other values not recited in the numerical range are also applicable.
The self-drilling groove adopts a four-edge self-drilling structure, can directly drill into bone, avoids the step of drilling the bone drill, and simplifies the operation steps.
Preferably, the self-drilling headless hollow screw device system further comprises a screwdriver mated with the screw body.
The screwdriver comprises a screwdriver handle, a screwdriver rod and a windmill-shaped hexagonal stud.
One end of the screwdriver rod is fixedly connected with the screwdriver handle into a whole.
The other end of the screwdriver rod is provided with a windmill-shaped hexagonal stud.
The windmill-shaped hexagon flower-shaped stud is matched with the windmill-shaped inner hexagon flower-shaped drive.
The screwdriver rod is in a smooth cylindrical shape.
The self-drilling headless hollow screw device system provided by the utility model is used for orthopedic surgery, and screws with corresponding diameters and lengths are selected according to different fracture parts of patients before surgery. The orthopedic surgery comprises the following steps:
(1) adopting a Kirschner wire to punch and position, and measuring the depth;
(2) selecting screws of corresponding diameters and lengths;
(3) the screwdriver provided by the utility model is used for driving a screw to be driven into a bone along the Kirschner wire.
The system refers to an equipment system, or a production equipment.
Compared with the prior art, the utility model has the beneficial effects that:
(1) the screw body in the self-drilling headless hollow screw device system provided by the utility model is provided with the self-drilling groove with a four-edge self-drilling structure, and the screw body can directly drill a bone, so that the step of drilling the bone is omitted;
(2) the screw body in the self-drilling headless hollow screw device system provided by the utility model is provided with shallow thread type threads, so that stronger holding force can be provided for bone;
(3) the screw body in the self-drilling headless hollow screw device system provided by the utility model is driven in a windmill-shaped hexagon socket flower shape, and the screwdriver matched with the screw body is provided with a windmill-shaped hexagon socket flower-shaped stud, so that the torsion performance of the screwdriver is improved, and the screwdriver is prevented from being broken in the using process.
Drawings
FIG. 1 is a schematic structural view of a screw body according to the present invention;
FIG. 2 is a schematic structural view of a screwdriver provided by the present invention;
fig. 3 is a schematic diagram of the windmill-shaped hexagon socket head drive provided in embodiment 1.
Wherein: 1 is a self-drilling groove, 2 is a screw rod, 2 is a screwdriver, 3-1 is a screwdriver handle, 3-2 is a screwdriver rod, and 3-3 is a windmill-shaped hexagon stud.
Detailed Description
It is to be understood that in the description of the present invention, the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be taken as limiting the present invention.
It should be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "disposed," "connected" and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
The technical scheme of the utility model is further explained by the specific implementation mode in combination with the attached drawings.
Example 1
The present implementation provides a self-drilling headless hollow screw device system including a screw body as shown in fig. 1.
The screw body comprises a screw rod 2 and a self-drilling groove 1 along the direction from the head to the tail;
the head of the screw rod is provided with a windmill-shaped inner hexagonal flower-shaped drive which is inwards sunken as shown in figure 3;
the self-drilling groove 1 and the screw rod 2 are fixedly connected into a whole;
the self-drilling groove 1 and the screw rod 2 are positioned on the same axis.
The diameter of the screw rod 2 is gradually reduced along the direction from the head to the tail; the diameter of the head of the screw rod 2 is 2.8mm, the diameter of the tail of the screw rod 2 is 2.5mm, and the length of the screw rod 2 is 8 mm.
The thread on the screw rod 2 is a shallow thread type thread; the thread pitch of the shallow thread profile thread is 0.55-0.75 mm; the depth of the shallow thread profile thread is 0.3 mm.
The shallow thread profile thread is an asymmetric thread, the flank angle of the thread working surface is 20 degrees, and the flank angle of the non-working surface is 3 degrees.
The self-drilling groove 1 is of a four-edge self-drilling structure.
The equivalent diameter of the self-drilling groove 1 is 1.9 mm; the length of the self-drilling groove 1 is 3 mm.
The self-drilling headless hollow screw device system further comprises a screwdriver 3 mated with the screw body as shown in fig. 2.
The screwdriver comprises a screwdriver handle 3-1, a screwdriver rod 3-2 and a windmill-shaped hexagonal stud 3-3.
One end of the screwdriver rod 3-2 is fixedly connected with the screwdriver handle 3-1 into a whole.
The other end of the screwdriver rod 3-2 is provided with a windmill-shaped hexagonal stud 3-3.
The windmill-shaped hexagon flower-shaped stud 3-3 is matched with the windmill-shaped hexagon flower-shaped drive.
The screwdriver rod 3-2 is in a smooth cylindrical shape.
After the kirschner wire is used for positioning and the depth is measured, the self-drilling headless hollow screw device system provided by the embodiment is adopted for operation, and the operation further comprises the following steps: the screwdriver provided by the embodiment is used for driving the screw to be driven into the bone along the Kirschner wire.
The screw body in the self-drilling headless hollow screw device system provided by the embodiment can be implanted into a bone in diameter, has threads with shallow thread forms, and has stronger holding force; the windmill-shaped inner hexagonal flower-shaped driver is arranged on the screw body, so that the torsion performance of the screwdriver is enhanced, and the occurrence of the fracture event of the screwdriver in the operation process is avoided.
Example 2
This implementation provides a self-drilling headless hollow screw device system that includes a screw body.
The screw body comprises a screw rod 2 and a self-drilling groove 1 along the direction from the head to the tail;
the head of the screw rod is provided with an inwards-recessed windmill-shaped inner hexagonal flower-shaped drive;
the self-drilling groove 1 and the screw rod 2 are fixedly connected into a whole;
the self-drilling groove 1 and the screw rod 2 are positioned on the same axis.
The diameter of the screw rod 2 is gradually reduced along the direction from the head to the tail; the diameter of the head of the screw rod 2 is 7mm, the diameter of the tail of the screw rod 2 is 6.5mm, and the length of the screw rod 2 is 130 mm.
The threads on the screw rod 2 are shallow thread type threads; the thread pitch of the shallow thread tooth type thread is 2.0-2.5 mm; the depth of the shallow thread profile thread is 1.0 mm.
The shallow thread profile thread is an asymmetric thread, the flank angle of the thread working surface is 40 degrees, and the flank angle of the non-working surface is 20 degrees.
The self-drilling groove 1 is of a four-edge self-drilling structure.
The equivalent diameter of the self-drilling groove 1 is 4.5 mm; the length of the self-drilling groove 1 is 5 mm.
The self-drilling headless hollow screw device system further comprises a screwdriver 3 matched with the screw body.
The screwdriver comprises a screwdriver handle 3-1, a screwdriver rod 3-2 and a windmill-shaped hexagonal stud 3-3.
One end of the screwdriver rod 3-2 is fixedly connected with the screwdriver handle 3-1 into a whole.
The other end of the screwdriver rod 3-2 is provided with a windmill-shaped hexagonal stud 3-3.
The windmill-shaped hexagon flower-shaped stud 3-3 is matched with the windmill-shaped hexagon flower-shaped drive.
The screwdriver rod 3-2 is in a smooth cylindrical shape.
After the kirschner wire is used for positioning and the depth is measured, the self-drilling headless hollow screw device system provided by the embodiment is adopted for operation, and the operation further comprises the following steps: the screwdriver provided by the embodiment is used for driving the screw to be driven into the bone along the Kirschner wire.
The screw body in the self-drilling headless hollow screw device system provided by the embodiment can be implanted into a bone in diameter, has threads with shallow thread forms, and has stronger holding force; the windmill-shaped inner hexagonal flower-shaped driver is arranged on the screw body, so that the torsion performance of the screwdriver is enhanced, and the occurrence of the fracture event of the screwdriver in the operation process is avoided.
Example 3
This implementation provides a self-drilling headless hollow screw device system that includes a screw body.
The screw body comprises a screw rod 2 and a self-drilling groove 1 along the direction from the head to the tail;
the head of the screw rod is provided with an inwards-recessed windmill-shaped inner hexagonal flower-shaped drive;
the self-drilling groove 1 and the screw rod 2 are fixedly connected into a whole;
the self-drilling groove 1 and the screw rod 2 are positioned on the same axis.
The diameter of the screw rod 2 is gradually reduced along the direction from the head to the tail; the diameter of the head of the screw rod 2 is 3.6mm, the diameter of the tail of the screw rod 2 is 3mm, and the length of the screw rod 2 is 50 mm.
The threads on the screw rod 2 are shallow thread type threads; the thread pitch of the shallow thread tooth type thread is 0.9-1.5 mm; the depth of the shallow thread profile thread is 0.5 mm.
The shallow thread profile thread is an asymmetric thread, the flank angle of the thread working surface is 30 degrees, and the flank angle of the non-working surface is 10 degrees.
The self-drilling groove 1 is of a four-edge self-drilling structure.
The equivalent diameter of the self-drilling groove 1 is 2.4 mm; the length of the self-drilling groove 1 is 4 mm.
The self-drilling headless hollow screw device system further comprises a screwdriver 3 matched with the screw body.
The screwdriver comprises a screwdriver handle 3-1, a screwdriver rod 3-2 and a windmill-shaped hexagonal stud 3-3.
One end of the screwdriver rod 3-2 is fixedly connected with the screwdriver handle 3-1 into a whole.
The other end of the screwdriver rod 3-2 is provided with a windmill-shaped hexagonal stud 3-3.
The windmill-shaped hexagon flower-shaped stud 3-3 is matched with the windmill-shaped hexagon flower-shaped drive.
The screwdriver rod 3-2 is in a smooth cylindrical shape.
After the kirschner wire is used for positioning and the depth is measured, the self-drilling headless hollow screw device system provided by the embodiment is adopted for operation, and the operation further comprises the following steps: the screwdriver provided by the embodiment is used for driving the screw to be driven into the bone along the Kirschner wire.
The screw body in the self-drilling headless hollow screw device system provided by the embodiment can be implanted into a bone in diameter, has threads with shallow thread forms, and has stronger holding force; the windmill-shaped inner hexagonal flower-shaped driver is arranged on the screw body, so that the torsion performance of the screwdriver is enhanced, and the occurrence of the fracture event of the screwdriver in the operation process is avoided.
Example 4
This embodiment provides a self-drilling headless hollow screw device system which is the same as embodiment 3 except that the thread on the screw shaft 2 is changed to a triangular thread. The triangular threads are symmetrical threads.
After the kirschner wire is used for positioning and the depth is measured, the self-drilling headless hollow screw device system provided by the embodiment is adopted for operation, and the operation further comprises the following steps: the screwdriver provided by the embodiment is used for driving the screw to be driven into the bone along the Kirschner wire.
The thread on the screw rod in the self-drilling headless hollow screw device system provided by the embodiment is a triangular thread, and has weak holding force on bone, so that the self-breaking headless hollow screw is easier to remove after the operation is finished, the fixation failure is caused, and the pain of a patient is increased.
Example 5
The present embodiment provides a self-drilling headless hollow screw device system which changes the four-edged self-drilling structure of the self-drilling groove 1 into a three-edged tip structure, in addition to the self-drilling structure.
After the kirschner wire is used for positioning and the depth is measured, the self-drilling headless hollow screw device system provided by the embodiment is adopted for operation, and the operation further comprises the following steps: (1) drilling a bone by using a guider and a bone drill, and opening an implantation channel; (2) the screwdriver provided by the embodiment is used for driving the screw to be driven into the bone along the Kirschner wire.
The self-drilling headless hollow screw device system provided by the embodiment still needs to use a bone drill to open the implantation channel of the screw in the operation process, thereby increasing the operation difficulty and the operation time.
Comparative example 1
The present comparative example provides a self-drilling headless hollow screw device system that changes the windmill-shaped hexagon socket head drive provided on the screw rod 2 into a hexagon socket head drive; the windmill-shaped hexagon socket head stud on the screwdriver 3 is changed into a hexagon stud, the sectional area of the inner hexagon drive is smaller than that of the windmill-shaped hexagon socket head drive provided by the embodiment 3, and the rest is the same as that of the embodiment 3.
Positioning by using a Kirschner wire, measuring the depth, and performing surgery by using the self-drilling headless hollow screw device system provided by the comparative example, wherein the surgery further comprises the following steps: the screwdriver provided by the comparative example is used for driving a screw to be driven into a bone along a kirschner wire.
The self-drilling headless hollow screw device system provided by the comparative example has the advantages that the screw driver is broken in the using process, so that the medical instrument is damaged, the operation difficulty is increased, and the pain of a patient is increased.
In summary, the self-drilling headless hollow screw device system provided by the utility model comprises a self-drilling headless hollow screw and a screwdriver matched with the self-drilling headless hollow screw, wherein the self-drilling headless hollow screw is provided with a self-drilling groove with a four-blade self-drilling structure and can directly enter a bone; the thread with a shallow thread form has stronger holding force, and also has windmill-shaped inner hexagonal flower-shaped driving, so that the torsion performance of corresponding medical instruments is enhanced; the screwdriver is matched with the self-drilling headless hollow screw for use, has stronger torsion performance, and reduces the possibility of instrument damage.
The applicant declares that the above description is only a specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and it should be understood by those skilled in the art that any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are within the scope and disclosure of the present invention.

Claims (10)

1. A self-drilling headless hollow screw device system, characterized in that it comprises a screw body;
the screw body comprises a screw rod and a self-drilling groove along the direction from the head to the tail;
the head of the screw rod is provided with an inwards-recessed windmill-shaped inner hexagonal flower-shaped drive;
the self-drilling groove and the screw rod are fixedly connected into a whole;
the self-drilling groove and the screw rod are positioned on the same axis.
2. A self-drilling headless hollow screw device system according to claim 1, wherein said screw shaft is tapered in diameter in a head-to-tail direction.
3. A self-drilling headless hollow screw device system according to claim 2, wherein said screw shank head diameter is 2.8-7 mm;
the diameter of the tail part of the screw rod is 2.5-6.5 mm.
4. A self-drilling headless hollow screw device system according to claim 2, wherein the length of said screw rod is 8-130 mm.
5. A self-drilling headless hollow screw device system according to claim 2, wherein the threads on the screw shaft are shallow thread type threads;
the shallow thread profile thread comprises an HA shallow thread profile thread.
6. A self-drilling headless hollow screw device system according to claim 5, wherein the thread pitch of the shallow thread profile thread is 0.3-3.0 mm.
7. A self-drilling headless hollow screw device system according to claim 5, wherein the depth of the shallow thread profile thread is 0.3-1.0 mm.
8. A self-drilling headless hollow screw device system according to claim 1, wherein the structure of the self-drilling slot is a four-edged self-drilling structure.
9. A self-drilling headless hollow screw device system according to claim 1, characterized in that the equivalent diameter of the self-drilling slot is 1.9-4.5 mm;
the length of the self-drilling groove is 3-5 mm.
10. The self-drilling headless hollow screw device system of claim 1, further comprising a screwdriver mated to the screw body;
the screwdriver comprises a screwdriver handle, a screwdriver rod and a windmill-shaped hexagonal stud;
one end of the screwdriver rod is fixedly connected with the screwdriver handle into a whole;
the other end of the screwdriver rod is provided with a windmill-shaped hexagonal stud;
the windmill-shaped hexagon flower-shaped stud is matched with the windmill-shaped hexagon flower-shaped drive;
the screwdriver rod is in a smooth cylindrical shape.
CN202121331876.6U 2021-06-16 2021-06-16 Self-drilling headless hollow screw device system Active CN215651472U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202121331876.6U CN215651472U (en) 2021-06-16 2021-06-16 Self-drilling headless hollow screw device system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202121331876.6U CN215651472U (en) 2021-06-16 2021-06-16 Self-drilling headless hollow screw device system

Publications (1)

Publication Number Publication Date
CN215651472U true CN215651472U (en) 2022-01-28

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ID=79975355

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Application Number Title Priority Date Filing Date
CN202121331876.6U Active CN215651472U (en) 2021-06-16 2021-06-16 Self-drilling headless hollow screw device system

Country Status (1)

Country Link
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