Multidirectional locking and fixing device for screw
A fixation device and screw technology, applied in fixers, internal fixators, internal bone synthesis, etc., can solve the problems of inconvenient operation, unfavorable thread locking, changing screws, etc., and achieve the effect of convenient operation
Inactive Publication Date: 2010-12-15
THE FIRST AFFILIATED HOSPITAL OF THIRD MILITARY MEDICAL UNIVERSITY OF PLA
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Problems solved by technology
However, thread locking also has the disadvantage that the direction of the screw is constant, and the direction of the screw cannot be changed according to the needs of the surgical condition, which affects the stability of the screw and the bone structure to be fixed, and brings great inconvenience to the operation, which is not conducive to Take full advantage of thread locking
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[0010] Such as figure 1 , figure 2 As shown, the fixing device 1 is a plate-shaped embodiment, including a circular nail hole 2, a screw 5, and a pin 6 on the fixing device 1, the inner wall of the circular nail hole 2 is a spherical arc surface, and the fixing device 1 The upper circular pin holes 3 are adjacent to each other and communicate with each other. The arc surface of the wall ball in the hole 2 of the circular nail hole is in contact with the outer wall of the unclosed C-shaped ring 4 in a spherical arc surface, and the inner thread of the inner wall of the C-shaped ring 4 is connected to the screw. 5 is engaged, and a pin 6 is placed between the circular pin hole 3 and the unclosed ends of the C-shaped ring 4.
[0011] The fixation device 1 can be a steel plate, or titanium plate, titanium rod, external fixation bracket, etc.; the fixation device 1 can be plate-shaped, arc-shaped, triangular or special anatomical shape according to the needs of the application si...
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The invention discloses a multidirectional locking and fixing device for a screw, which belongs to a medicinal instrument. A fixing device (1) is provided with a circular screw hole (2), a screw (5) and pins (6), wherein the inner wall of the circular screw hole (2) is a spherical cambered surface; the circular screw hole (2) is adjacent to and communicated with a circular pin hole (3) on the fixing device (1); the spherical cambered surface of the inner wall of the circular screw hole (2) is jointed with the spherical cambered surface of the outer wall of an unclosed C-shaped ring (4); the internal thread on the inner wall of the C-shaped ring (4) is engaged with the screw (5); and the pins (6) are placed between the circular pin hole (3) and the unclosed two ends of the C-shaped ring (4). The device has the advantages of locking and fixing stability and variable screw direction flexibility at the same time, and particularly has the advantages of predominant flexibility, stability and operation convenience during dissecting a part with a complex structure or a destroyed bone part. The device is mainly used for clinical surgical fixation such as fracture fixation, spinal column fixation, spinal column fusion, joint fusion, orthopedics and the like.
Description
technical field [0001] The invention belongs to the technical field of internal fixation of medical devices, and specifically relates to a multi-directional locking device used for connection between screws and fixation devices when used in clinical operations such as fracture fixation, spinal fixation, spinal fusion, joint fusion, and deformity correction. fixed technology. Background technique [0002] Clinically, various fracture fixation, spinal fixation, spinal fusion, joint fusion, deformity correction and other operations mostly require the use of fixation equipment, and the existing screws and fixation devices (plates, titanium plates, titanium rods, external fixators, etc.) Structurally locked connections. The thread locking refers to the prefabricated thread in the circular nail hole on the fixing device. After screwing in with a screw with a threaded head, the screw and the fixing device become a whole, independent of the friction force of the bone-plate interfac...
Claims
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IPC IPC(8): A61B17/68
Inventor 罗飞许建中张泽华侯天勇谢肇吴雪晖
Owner THE FIRST AFFILIATED HOSPITAL OF THIRD MILITARY MEDICAL UNIVERSITY OF PLA