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Expandable bone screw assembly

A bone screw and component technology, which is applied in fastening devices, internal bone synthesis, medical science, etc., can solve problems such as weak anti-pullout ability, affecting screw biomechanical stability, bone cutting, etc., to achieve enhanced anti-pullout The ability to resist cutting and improve the effect of biomechanical stability

Inactive Publication Date: 2017-11-17
THE SECOND HOSPITAL AFFILIATED TO WENZHOU MEDICAL COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] When the surgeon performs orthopedic surgery, screw fixation is a widely used technique, and screws are often used for internal fixation. At present, when screw fixation is performed, the screw is usually tapered, with a thinner head and a thicker end. This kind of screw When fixed on patients with cancellous bone or osteoporosis, the ability to resist pulling out is weak, and because the diameter of the front end of the screw is small, it is easy to cut the bone, thereby affecting the biomechanical stability of screw fixation, and eventually causing screw fixation failure, affecting the effect of surgical treatment, therefore, there is an urgent need for a new orthopedic fixation device with better fixation effect

Method used

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  • Expandable bone screw assembly
  • Expandable bone screw assembly
  • Expandable bone screw assembly

Examples

Experimental program
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Effect test

specific Embodiment 1

[0016] like Figure 5 As shown, the expandable bone screw assembly includes a bone screw body 1 and a spreader inner core 2, such as figure 1 , 2 As shown, the front part of the bone screw body 1 is provided with an external thread, of course, the entire piece may be provided with an external thread, and the rear end is provided with a structure that is convenient for a tool to screw the screw, such as a cross recess or an inner hexagonal cavity. The bone screw body 1 is divided into an expansion section 101 and a driving section 102, and an axial through hole 103 is provided in the center, and a weak zone 104 is provided at the boundary between the expansion section 101 and the driving section 102, and the weak zone 104 makes the expansion The section 101 can be properly deformed without breaking. The weak zone 104 can be formed by an annular groove on the cylindrical surface of the bone screw body 1. The annular groove can be an arc-shaped groove, a trapezoidal groove, a tr...

specific Embodiment 2

[0020] like figure 1 , 2 As shown, the expandable bone screw assembly includes a bone screw body 1 and a spreader inner core 2. The front part of the bone screw body 1 is provided with external threads, and the rear end is provided with a structure for convenient tool screwing, such as a cross recess or Hexagonal cavity. The bone screw body 1 is divided into an expansion section 101 and a driving section 102, and an axial through hole 103 is arranged in the center. The diameter of the axial through hole 103 in this specific embodiment can be consistent from front to back, or can be similar to the specific embodiment 1. The diameter of the axial through hole 103 corresponding to the part of the driving section 102 is slightly larger, and the boundary between the expansion section 101 and the driving section 102 is provided with a weakened area 104, and the weakened area 104 allows the expansion section 101 to be properly deformed and Without breaking, the weakened area 104 ca...

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Abstract

The invention belongs to the field of bone surgery instruments and concretely relates to a novel expandable bone screw assembly. The center of a bone screw body is provided with a through hole. The front section of the bone screw body is divided into multiple pieces which form an expansion section; the expansion section is matched with an expanding core, of which the front end is provided with an expansion part or an elastic-expanding balloon. When the assembly is put in use, the bone screw body which is not expanded is firstly placed into bone substance. Then, the balloon or the expansion part,placed into an axial through hole, is utilized for strutting and expanding the expansion section divided in multiple pieces. Therefore, an inverted cone shape is formed by expansion of the front end of a screw. Therefore, the diameter of the most front end of the screw is larger than that of the middle part of the screw. As a result, anti-pulling and anti-cutting capabilities of the screw are enhanced, which improves biomechanical stability of screw fixation.

Description

technical field [0001] The invention belongs to the field of orthopedic surgical instruments, and in particular relates to a new bone screw---an expandable bone screw assembly. Background technique [0002] When the surgeon performs orthopedic surgery, screw fixation is a widely used technique, and screws are often used for internal fixation. At present, when screw fixation is performed, the screw is usually tapered, with a thinner head and a thicker end. This kind of screw When fixed on patients with cancellous bone or osteoporosis, the ability to resist pulling out is weak, and because the diameter of the front end of the screw is small, it is easy to cut the bone, thereby affecting the biomechanical stability of screw fixation, and eventually causing screw fixation Failure affects the surgical treatment effect, therefore, there is an urgent need for a new orthopedic fixation device with better fixation effect. Contents of the invention [0003] The object of the presen...

Claims

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Application Information

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IPC IPC(8): A61B17/68A61B17/86
CPCA61B17/68A61B17/8635A61B2017/564A61B2017/8655
Inventor 林仲可
Owner THE SECOND HOSPITAL AFFILIATED TO WENZHOU MEDICAL COLLEGE