CN108904024B - Self-breaking type pressurizing bolt assembly - Google Patents
Self-breaking type pressurizing bolt assembly Download PDFInfo
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- CN108904024B CN108904024B CN201810879668.6A CN201810879668A CN108904024B CN 108904024 B CN108904024 B CN 108904024B CN 201810879668 A CN201810879668 A CN 201810879668A CN 108904024 B CN108904024 B CN 108904024B
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/683—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin comprising bone transfixation elements, e.g. bolt with a distal cooperating element such as a nut
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/84—Fasteners therefor or fasteners being internal fixation devices
- A61B17/86—Pins or screws or threaded wires; nuts therefor
- A61B17/8605—Heads, i.e. proximal ends projecting from bone
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- Health & Medical Sciences (AREA)
- Orthopedic Medicine & Surgery (AREA)
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- General Health & Medical Sciences (AREA)
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- Surgical Instruments (AREA)
Abstract
A self-breaking type pressurizing bolt component belongs to the technical field of orthopedic medical instruments and is used for external pressurization and reduction in the process of tibial plateau fracture. The technical scheme is as follows: the diameter at the rear part of the screw rod of the pressure bolt is smaller than that at the front part of the screw rod, the joint part of the large-diameter section and the small-diameter section of the screw rod is an inclined annular connecting section, an inner hole is formed in the rod body at the rear part of the screw rod, the inner hole of the pressure nut is an unequal-diameter screw hole, the thread of the large-diameter screw hole at the front part of the pressure nut is matched with the thread of the large-diameter section of the screw rod of the pressure bolt, the thread of the small-diameter screw hole at the rear part of the pressure nut is matched with the thread of the small-diameter section of the screw rod of. The invention has simple structure, convenient operation and reliable effect, eliminates the conditions of pain, limited movement and the like caused by local soft tissue stimulation due to overlong left tail end of the pressurizing bolt, avoids various complications and achieves satisfactory resetting effect.
Description
Technical Field
The invention relates to a device for external pressurization reduction in the treatment of tibial plateau fracture, belonging to the technical field of orthopedic medical instruments.
Background
The minimally invasive operation of the tibial plateau fracture has the advantages of reducing the operation trauma and effectively reducing the incidence of intraoperative and postoperative complications, and the key to the success is to realize the fracture closed reduction. The imaging performance of tibial plateau fractures is often fracture of tibial plateau cleavage, collapse of joint surfaces, and even metaphyseal shattering of severe patients. The operation difficulty is high, and the operation skill requirement is high, so the treatment of the tibial plateau fracture is always a traumatic orthopedic difficulty. At present, the minimally invasive reduction technology of tibial plateau fracture is mainly used for jacking a collapsed and displaced fracture block and comprises an arthroscope assisted minimally invasive jacking reduction technology, a balloon forming minimally invasive reduction technology and the like, but the tibial plateau is often widened, and if the tibial plateau cannot be accurately reduced, the force line is not correct, and the image curative effect is achieved. At present, a bolt is used for pressurization, but the problems that the tail end of the bolt is too long after pressurization, skin is stimulated to generate local soft tissue pain and the like exist. This problem has not been solved satisfactorily so far, and it is necessary to develop new instruments and bolts for fixing.
Disclosure of Invention
The invention aims to solve the technical problem of providing a self-breaking type pressurizing bolt assembly which can be broken from a pressurizing part after a pressurizing bolt is screwed to a proper position, so that the tail end of the pressurizing bolt is prevented from being left too long, and the problems of pain, limited movement and the like caused by local soft tissue stimulation due to the fact that the tail end of the bolt is left too long are solved.
The technical scheme for solving the technical problems is as follows:
a self-breaking pressure bolt assembly comprises a pressure bolt and a pressure nut, wherein the screw rod of the pressure bolt is a non-isodiametric screw rod, the diameter of the rear part of the screw rod is smaller than that of the front part of the screw rod, the joint part of the large-diameter section and the small-diameter section of the screw rod is an inclined annular connecting section, the small-diameter section, the annular connecting section and the large-diameter section close to the annular connecting section are respectively provided with threads, the rear part of the screw rod is provided with an inner hole, the inner hole extends from the tail end surface of the screw rod to the annular connecting section which exceeds the joint part of the large-diameter section and the small-diameter section of the screw rod and reaches the inside of the large-diameter section, the wall thickness between the annular connecting section and the inner hole is smaller than that between the rear part of the screw rod and the inner hole, the inner hole of the pressure nut is a non-isodiametric screw hole, the threads of the large-diameter screw, the joint of the large-diameter screw hole at the front part of the pressure nut and the small-diameter screw hole at the rear part of the pressure nut is an annular plane vertical to the central axis of the pressure nut.
According to the self-breaking type pressurizing bolt assembly, the front end face of the pressurizing nut is located at the external pressurizing position of the tibial platform at the rear part of the pressurizing bolt, and the annular plane at the joint of the large-diameter screw hole and the small-diameter screw hole of the pressurizing nut is opposite to the rear end of the annular connecting section of the pressurizing bolt.
The self-breaking pressure bolt assembly also comprises a twist-off screwdriver, wherein the twist-off screwdriver consists of a handle, a conical rod and a conical head, the handle is sequentially connected with the conical rod and the conical head, the front end of the conical head is provided with an inner hole, the inner hole is hexagonal, and the hexagon of the inner hole is matched with the peripheral shape of the pressure nut.
The invention has the beneficial effects that:
according to the invention, the inner hole is designed at the rear part of the pressurizing bolt, the small-diameter screw rod is arranged outside the inner hole, and the pressurizing nut can automatically cut off the screw rod of the pressurizing bolt from the unequal-diameter connecting part of the pressurizing bolt while pressurizing the tibial plateau, so that the purpose of preventing the tail end of the pressurizing bolt from being left too long is achieved.
The invention is the first creation of tibial plateau fracture pressurization, solves the problem that the tail end of a common pressurization bolt is left too long after pressurization by using the pressurization bolt, eliminates the conditions of pain, limited movement and the like caused by local soft tissue stimulation due to the fact that the tail end of the bolt is left too long, and is beneficial to the rehabilitation of patients. The invention has simple structure, convenient operation and reliable effect, can keep the pressurizing state of the pressurizing bolt, avoids the generation of various complications, ensures that the tibial fracture achieves satisfactory reduction effect, provides technical support for the development of minimally invasive technology in the tibial plateau fracture treatment, and has good popularization and application and invention conversion values in the industry.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of the assembled state of FIG. 1;
fig. 3 is a schematic view of the state of use of the present invention.
The figures are labeled as follows: the compression screw comprises a compression screw bolt 1, a compression screw cap 2, a large-diameter section 3, a small-diameter section 4, an annular connecting section 5, an inner hole 6, a large-diameter screw hole 7, a small-diameter screw hole 8, an annular plane 9, a twist-off screwdriver 10, a handle 11, a conical rod 12, a conical head 13 and a tibia 14.
Detailed Description
The self-breaking type pressure bolt assembly of the invention consists of a pressure bolt 1, a pressure nut 2 and a twist-off screwdriver 10.
Fig. 1 and 2 show that the screw of the pressure bolt 1 is a non-uniform diameter screw, the diameter of the rear portion of the screw is smaller than that of the front portion of the screw, the joint portion of the large diameter section 3 and the small diameter section 4 of the screw is an inclined annular connecting section 5, and the small diameter section 4, the annular connecting section 5 and the large diameter section 3 near the annular connecting section 5 of the screw are respectively threaded for screwing in the pressure nut 2.
Fig. 1 and 2 show that the shank of the rear portion of the screw of the pressure bolt 1 has an inner hole 6, the inner hole 6 extends from the end face of the screw to an annular connecting section 5 which exceeds the joint portion of the large diameter section 3 and the small diameter section 4 of the screw and reaches the inside of the large diameter section 3, and the wall thickness between the annular connecting section 5 and the inner hole 6 is smaller than that between the rear portion of the screw and the inner hole 6 and is broken when a large pressure is applied. The rear part of the pressure bolt 1 adopts an inner hole 6 structure, so that the pressure bolt 1 is broken off from the rear part, the inner hole 6 greatly reduces the strength of a screw rod and reduces the breaking difficulty, and the inner hole 6 is an inclined annular wall on the hole wall of the annular connecting section 5, has a thin wall thickness and can be cut off by the pressure nut 2 in a pressurizing way.
Fig. 1 and 2 show that the inner hole of the pressure nut 2 is a non-uniform diameter screw hole, the front part of the pressure nut 2 is a large diameter screw hole 7, the rear part of the pressure nut 2 is a small diameter screw hole 8, the thread of the large diameter screw hole 7 at the front part of the pressure nut 2 is matched with the thread of the large diameter section 3 of the screw rod of the pressure bolt 1, and the thread of the small diameter screw hole 8 at the rear part of the pressure nut 2 is matched with the thread of the small diameter section 4 of the screw rod of the. When the pressure nut 2 is coupled to the pressure bolt 1, the large-diameter section 3 of the pressure bolt 1 is screwed into the large-diameter threaded hole 7 of the pressure nut 2, and the small-diameter section 4 of the pressure bolt 1 is screwed into the small-diameter threaded hole 8 of the pressure nut 2.
Fig. 1 and 2 show that the connection between the front large-diameter threaded hole 7 and the rear small-diameter threaded hole 8 of the pressure nut 2 is an annular flat surface 9 perpendicular to the central axis of the pressure nut 2. The annular flat surface 9 functions to move the annular flat surface 9 forward when the annular flat surface 9 of the pressure nut 2 reaches the annular connecting section 5 of the pressure bolt 1 when the pressure nut 2 is screwed into the pressure bolt 1, to press the annular connecting section 5, and when the pressure is sufficiently high, to cut the annular wall of the annular connecting section 5, thereby achieving the purpose of cutting the pressure bolt 1.
Fig. 1 shows that the twist-off screwdriver 10 is also provided, the twist-off screwdriver 10 is composed of a handle 11, a conical rod 12 and a conical head 13, the handle 11 is sequentially connected with the conical rod 12 and the conical head 13, the front end of the conical head 13 is provided with an inner hole, the inner hole is hexagonal, and the hexagon of the inner hole is matched with the peripheral shape of the pressure nut 2.
Fig. 2 and 3 show that, in order that the compression nut 2 can cut the compression bolt 1 in time when the compression nut 2 reaches the bone wall of the tibia 14, it is necessary to measure before the operation, and set the length of the compression bolt 1 and the thickness of the compression nut 2 so that the annular flat surface 9 at the junction of the large-diameter screw hole 7 and the small-diameter screw hole 8 of the compression nut 2 is just opposite to the rear end of the annular connecting section 5 of the compression bolt 1 when the front end surface of the compression nut 2 is located at the external compression site of the tibial plateau at the rear of the compression bolt 1. Therefore, the compression bolts 1 and the compression nuts 2 of the present invention should be provided in a plurality of sets, and the lengths of the plurality of sets of compression bolts 1 and the thicknesses of the plurality of sets of compression nuts 2 are different, so that the sets of compression bolts and the sets of compression nuts can be selected according to the conditions of patients in the operation.
Fig. 3 shows the use of the present invention as follows:
firstly, selecting a proper group of pressurizing bolts 1 and pressurizing nuts 2 according to the damage and restoration conditions of the tibia 14 of a patient, restoring the damaged tibia 14, screwing the pressurizing bolts 1 from one side of the tibia 14, and connecting the restored bone blocks into a whole;
then, the end of the compression bolt 1, which penetrates the tibia 14, is screwed into the compression nut 2, the large-diameter screw hole 7 of the compression nut 2 is sleeved on the large-diameter section 3 of the compression bolt 1, and the small-diameter screw hole 8 of the compression nut 2 is sleeved on the small-diameter section 4 of the compression bolt 1. The inner hole at the front end of the cone head 13 of the twist-off screwdriver 10 is matched with the periphery of the pressure nut 2, and the pressure nut 2 is rotated forwards.
When the front end surface of the pressure nut 2 is tightly attached to the bone wall of the tibia 14, the annular plane 9 of the pressure nut 2 reaches the annular connecting section 5 of the pressure bolt 1, the screwdriver 10 is continuously rotated and twisted off, and the annular plane 9 of the pressure nut 2 continuously moves forwards to pressurize the annular connecting section 5. The annular wall of the annular connecting section 5 is cut off.
After the annular connecting section 5 of the compression bolt 1 is cut off, the small-diameter section 4 of the broken compression bolt 1 is taken out, and the compression nut 2 is continuously rotated, so that the compression nut 2 can properly pressurize the side wall of the tibia 14, and a satisfactory reduction effect is realized.
One embodiment of the invention is as follows:
the length of the large-diameter section 3 of the pressurizing bolt 1 is 55-120mm, and the diameter is 7 mm; the small-diameter section 4 is 50mm long and 4mm in diameter; the length of the annular connecting section 5 is 2.5mm and the wall thickness is 0.5 mm.
The outer diameter of the pressure nut 2 is 10mm, the diameter of the large-diameter screw hole 7 is 7mm, and the length of the large-diameter screw hole is 3 mm; the diameter of the small-diameter screw hole 8 is 4mm, and the length is 2.5 mm.
Claims (3)
1. The utility model provides a self-breaking type pressure bolt subassembly which characterized in that: it includes pressure bolt (1), pressure nut (2), the screw rod of pressure bolt (1) is the screw rod of inequilateral footpath, the diameter at screw rod rear portion is less than the anterior diameter of screw rod, the cyclic annular linkage segment (5) of the junction of big diameter section (3) and little diameter section (4) of screw rod, cyclic annular linkage segment (5), big diameter section (3) that are close to cyclic annular linkage segment (5) have the screw thread respectively, the body of rod has hole (6) at screw rod rear portion, hole (6) extend to cyclic annular linkage segment (5) that exceed big diameter section (3) and little diameter section (4) junction of screw rod from the screw rod terminal surface, reach the inside of big diameter section (3), the wall thickness between cyclic annular linkage segment (5) and hole (6) is less than the wall thickness between screw rod rear portion and hole (6), the hole of pressure nut (2) is the inequilateral footpath screw hole, the screw thread of the large-diameter screw hole (7) at the front part of the pressure nut (2) is matched with the screw thread of the large-diameter section (3) of the screw rod of the pressure bolt (1), the screw thread of the small-diameter screw hole (8) at the rear part of the pressure nut (2) is matched with the screw thread of the small-diameter section (4) of the screw rod of the pressure bolt (1), and the joint of the large-diameter screw hole (7) at the front part of the pressure nut (2) and the small-diameter screw hole (8) at the rear part is an annular plane (9) vertical to the central axis of the pressure.
2. The self-breaking compression bolt assembly of claim 1, wherein: the front end face of the pressure nut (2) is positioned at the external pressure part of the tibial plateau at the rear part of the pressure bolt (1), and the annular plane (9) at the joint of the large-diameter screw hole (7) and the small-diameter screw hole (8) of the pressure nut (2) is opposite to the rear end of the annular connecting section (5) of the pressure bolt (1).
3. The self-breaking compression bolt assembly of claim 1, wherein: the screw driver is further provided with a twist-off screw driver (10), the twist-off screw driver (10) is composed of a handle (11), a conical rod (12) and a conical head (13), the handle (11), the conical rod (12) and the conical head (13) are sequentially connected, an inner hole is formed in the front end of the conical head (13), the inner hole is hexagonal, and the hexagonal shape of the inner hole is matched with the peripheral shape of the pressurizing screw cap (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810879668.6A CN108904024B (en) | 2018-08-03 | 2018-08-03 | Self-breaking type pressurizing bolt assembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810879668.6A CN108904024B (en) | 2018-08-03 | 2018-08-03 | Self-breaking type pressurizing bolt assembly |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108904024A CN108904024A (en) | 2018-11-30 |
| CN108904024B true CN108904024B (en) | 2019-12-31 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810879668.6A Active CN108904024B (en) | 2018-08-03 | 2018-08-03 | Self-breaking type pressurizing bolt assembly |
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| CN (1) | CN108904024B (en) |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6027504A (en) * | 1996-12-06 | 2000-02-22 | Mcguire; David A. | Device and method for producing osteotomies |
| GB2324964A (en) * | 1997-05-08 | 1998-11-11 | Isis Innovation | Bone fixation device |
| US20090228049A1 (en) * | 2008-03-09 | 2009-09-10 | Park Sangdo | Connecting Cannulated Bone Screws |
| CN202235657U (en) * | 2011-08-11 | 2012-05-30 | 张英泽 | Screw device capable of performing effective pressurization |
| CN105232128A (en) * | 2015-10-29 | 2016-01-13 | 陈志力 | Fixing device in patella |
| CN209203471U (en) * | 2018-08-03 | 2019-08-06 | 河北医科大学第三医院 | A kind of self-stopping type pressurization bolt component |
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2018
- 2018-08-03 CN CN201810879668.6A patent/CN108904024B/en active Active
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| Publication number | Publication date |
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| CN108904024A (en) | 2018-11-30 |
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