Pedicle screw special for PLIF (Posterior Lumbar Interbody Fusion)
A pedicle screw and screw technology, applied in the field of medical devices, can solve problems such as high notch, difficult operation, and inconvenient installation of rods, and achieve the effects of small trauma area, simple operation, and reduced operation time
Inactive Publication Date: 2014-12-17
浙江嘉佑医疗器械有限公司
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Problems solved by technology
However, some problems have been found during clinical use, such as the insertion of the decompression pedicle screw, which makes the operation difficult due to the influence of the nail tail when the lumbar spinal canal is decompressed; Inconvenient; problems such as high notch due to nail tail shape
Method used
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[0028] Such as figure 1 , figure 2 , image 3 , Figure 4 , Figure 5 As shown, the special pedicle screw for PLIF of the present invention includes a universal screw 1 , a screw seat 2 , a locking snap ring 3 , an annular washer 4 , a rod presser 5 , and a compression screw 6 . The compression screw 6, the rod presser 5, the annular washer 4, and the locking snap ring 3 are installed in the chamber 21 of the screw seat 2 from top to bottom in sequence. The head 11 of the universal screw 1 is movably engaged in the locking snap ring 3 , and the threaded rod 12 of the universal screw 1 extends below the screw seat 2 . combine Figure 6 , Figure 7 As shown, the upper end surface of the annular washer 4 is provided with two symmetrically arranged arc-shaped grooves 41 , and the lower end of the annular washer 4 is located between the inner wall of the screw seat 2 and the outer wall of the locking snap ring 3 . combine Figure 8 , Figure 9 , Figure 10 As shown, the ...
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The invention relates to a pedicle screw special for PLIF (Posterior Lumbar Interbody Fusion) and belongs to the technical field of a medical instrument. The pedicle screw comprises a universal screw, a screw base, a locking snap ring, an annular gasket, a stick pressing device and a compression screw, wherein the compression screw, the stick pressing device, the annular gasket and the locking snap ring are sequentially arranged in a chamber of the screw base from top to bottom; the head of the universal screw is moveably arranged in the locking snap ring in a clamping way; the screw rod of the universal screw extends towards the downside of the screw base; two symmetrical arc grooves are formed in the upper end surface of the annular gasket; the lower end of the annular gasket is positioned between the inner wall of the screw base and the outer wall of the locking snap ring; the upper end of the stick pressing device is moveably arranged on the compression screw in a clamping way; an arc through groove is formed in the lower end surface of the stick pressing device; the groove opening of the arc through groove is opposite to the groove openings of the arc grooves; the compression screw and the screw base are connected through screw threads. The pedicle screw special for PLIF is short in surgery process and simple in operation and has small wound area for a patient.
Description
technical field [0001] The invention relates to a special pedicle screw for PLIF, which belongs to the technical field of medical instruments. Background technique [0002] One of the original purposes of lumbar spine surgery is to relieve nerve compression, but for this purpose, the removal of more posterior columns and accessories will cause instability of the spine. In addition, spinal instability will also occur when the spine is damaged, and bone graft fusion is born. . For lumbar fusion surgery, Watkins first reported the method of posterolateral fusion, which has become the standard operation method of lumbar fusion surgery. [0003] Lumbar fusion surgery mainly includes posterolateral lumbar fusion (PLF) and interbody fusion (interbody fusion), the latter can be divided into posterior lumbar interbody fusion (PLIF), anterior Interbody fusion (anterior lumbar interbody fusion, ALIF), transforaminal lumbar fusion (TLIF), etc. Clinically, a combination of interverteb...
Claims
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Patent Timeline
Login to View More IPC IPC(8): A61B17/84A61B17/70
CPCA61B17/8685A61B17/7074A61B2017/8655
Inventor 邱贵兴黄海生李坚尹杰王雄飞卢龙平
Owner 浙江嘉佑医疗器械有限公司