Medical vertebral arch pedicle renovating screw assembly

A technology of screw assembly and pedicle, which is used in fastening devices, internal fixators, internal bone synthesis, etc., can solve the problems of surrounding tissue damage, damage to the anterior column of the vertebral body, serious complications, etc., and improve bone strength. And, improve the pull-out strength, the effect of complete degradation and absorption

CN101669837BInactive Publication Date: 2010-12-08FOURTH MILITARY MEDICAL UNIVERSITY
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2010-12-08
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a medical vertebral arch pedicle renovating screw assembly which comprises a screw sheath and a screw which are mutually matched, wherein the screw sheath has certain mechanical strength and toughness, and the medical absorbable material can effectively maintain the mechanical strength for 2 to 3 months in vivo; the screw sheath is divided into a head end and a sheath body; the head end is a cone with a sealed front end, and the sheath body is a cylinder; external threads are arranged on the outer surface of the cylinder, and a longitudinally extended triangular prism-shaped cavity is arranged in the cylinder; the cylinder is divided into three side walls by the cavity, and internal threads are designed on the inner wall of the cavity; the screw is made of medical titanium alloy and comprises a thread section and a tail part; the thread section is formed by connecting a screw tip and a screw body, and both the screw tip and the screw body are in external threaddesign; the tail part is provided with a radially communicated U-shaped groove, and internal threads are arranged on the inner wall of the U-shaped groove. The invention can improve the internal fixation stability and reliability of the spinal column in a renovating operation or the secondary screw arranging process, reduce the occurring rate of vertebral arch pedicle screw loosening and even separation and lower the failure rate of operations.
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Description

technical field

[0001] The invention belongs to medical auxiliary equipment, and relates to pedicle screws used in spinal internal fixation, in particular to a medical pedicle revision screw assembly, which is mainly used to improve the stability of internal fixation during revision surgery or secondary screw placement during surgery and reduce the risk of internal fixation failure. Background technique

[0002] At present, transpedicular internal fixation has become a routine technique in spinal surgery. Pedicle screws can be used for three-dimensional correction of spinal deformity and reconstruction of spinal stability by means of traction, compression, and rotation. The key to the stability of pedicle screw fixation depends on whether sufficient "bone-screw" interface holding force can be obtained, and this holding force should be maintained until solid bony fusion between vertebral bodies is achieved. However, in clinical work, osteoporosis often leads to a decrease i...

Examples

Embodiment Construction

[0021] Refer to attached Figure 1-5 As shown, the medical pedicle revision screw assembly of the present invention is composed of a nail sheath 1 and a screw 2, which are used in conjunction with each other;

[0022] The nail sheath 1 is made of a medical absorbable material. The nail sheath 1 is divided into a head end A and a sheath body B; the head end A is a cone 3 with a closed front end, and the sheath body B is a cylinder 4. The outer surface of the cylinder 4 is provided with a first external thread 5 and a side hole 6, the first external thread 5 is a continuous thread, the tip of the thread is inclined to the tail end of the nail sheath 1, and the inside of the cylinder 4 is a longitudinally extending Triangular prism cavity 7, the cavity 7 divides the cylinder 4 into three side walls 8, the adjacent side walls 8 are closed and connected to form three side edges 9, and the side holes 6 are distributed between the first external threads 5 On the side wall 8 between ...