Internal vertebra fixing device
A fixation device and technology in the spine, applied in the field of medical devices, can solve problems such as inability to adapt to bone deformity, stenosis of intervertebral foramen, and compression of nerve roots
Active Publication Date: 2015-06-03
SHENZHEN INST OF ADVANCED TECH CHINESE ACAD OF SCI
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Problems solved by technology
It aims to solve the two shortcomings of the Graf ligament: ①The lordosis caused by the Graf ligament, especially when combined with facet joint disease, will lead to narrowing of the intervertebral foramen and compression of the nerve root
[0008] Non-fusion fixation techniques such as the FASS fixation system and Twinflex dynamic fixation system have certain flexibility, and are only suitable for young patients with good lumbar muscle strength and mild facet joint degeneration, and cannot adapt to patients with obvious bone deformities and extensive decompression. The needs of sick and elderly patients
Method used
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[0039] The spinal internal fixation device will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0040] Such as figure 1As shown, the spinal internal fixation device 10 according to one embodiment includes a plurality of fixation units 100 and a connecting rod 200 connecting the plurality of fixation units 100 .
[0041] see figure 2 and image 3 , each fixing unit 100 includes a pedicle screw 110 , a limiting sleeve 120 and a locking member 130 .
[0042] see Figure 4 and Figure 5 , the pedicle screw 110 is used to insert into the adjacent vertebrae to make an entry point. The pedicle screw 110 includes a vertebral head 114 and a pedicle screw 116 connected to one end of the vertebral head 114 and having threads 1162 . The cross-section of the vertebral head 114 is generally circular. It can be understood that the cross section of the vertebral head 114 can also be an ellipse or other shapes. A receiving groove 11...
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The invention discloses an internal vertebra fixing device. The internal vertebra fixing device comprises a plurality of fixing units and connecting rods, wherein each fixing unit comprises a pedicle screw and a limiting sleeve; each pedicle screw comprises a vertebra head part and a vertebra screw part connected with one end of the vertebra head part, used for being inserted into two adjacent vertebra set entering points, and provided with a thread; a containing groove is formed in the end surface at one end far away from vertebra screw part, of each vertebra head part; a first internal spherical surface is arranged at the bottom of each containing groove; two notches which are arranged oppositely and are communicated with each containing groove are formed at the periphery of each vertebra head part; the limiting sleeves can be movably contained in the containing grooves; and a first spherical surface bulge which props against the first internal spherical surface in a sliding manner is arranged on the outer wall of each limiting sleeve. The connecting rods sequentially and fixedly penetrate through the limiting sleeves of the plurality of fixing units and are contained inside the notches so as to link the plurality of fixing units at intervals. The internal vertebra fixing device is applicable to requirements on patients, aged patients and the like having evident bone malformation and needing wide decompression, so that the internal vertebra fixing device is strong in applicability.
Description
【Technical field】 [0001] The invention relates to the field of medical instruments, in particular to a spinal internal fixation device. 【Background technique】 [0002] Spinal internal fixation technology is widely used in the surgical treatment of spinal degenerative diseases, spinal stenosis, spondylolisthesis, spinal tumors, trauma, etc. The goals of spinal surgery are decompression, reconstruction of normal sequence, and bony fusion. Fusion procedures are often required after surgery to stabilize the spine, usually with spinal implants to support the spine until the desired level of fusion is achieved. The advantage of internal fixation lies in correcting deformity, promoting fusion, and early rehabilitation. The pedicle screw internal fixation system can effectively complete the three-column fixation of the spine and meet the biomechanical requirements of spinal fixation. It has become a commonly used spinal internal fixation system. [0003] Non-fusion internal fixat...
Claims
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IPC IPC(8): A61B17/70
Inventor 尚鹏白雪岭
Owner SHENZHEN INST OF ADVANCED TECH CHINESE ACAD OF SCI