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The Design and Mechanical Testing of Lumbar Transpedicular Dynamic Fixation System

Author: ZhuXiaoGuang
Tutor: DingLiangHua
School: Suzhou University
Course: Orthopedics
Keywords: Lumbar Dynamic fixation system Develop Mechanical testing
CLC: R687.3
Type: Master's thesis
Year: 2011
Downloads: 22
Quote: 0
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Abstract


Background light and the first lumbar degenerative disc disease, surgical intervention is often considered invalid after conservative treatment for at least 6 months of strict formal. Lumbar disc herniation often choose simple discectomy surgery for severe disc degeneration of the lumbar spinal canal stenosis, lumbar spondylolisthesis and instability patients, the line decompression, often used in spinal fusion surgery based on lumbar fixation is commonly used in the treatment of lumbar instability effective method. But for many patients, it will increase the stress concentration in adjacent segments, thereby inducing accelerated degeneration. The lumbar fusion non-fixed, also known as dynamic fixed, non-fusion method can effectively improve the conductivity of lumbar stress, relieve pain and prevent the occurrence of adjacent segment degeneration retain normal lumbar interbody activity. The purpose of the development of a new type of lumbar transpedicular dynamic fixation system to clarify its composition, principle and characteristics. By mechanical testing new lumbar dynamic fixation rods, compared with strong fixation rods, to investigate its clinical feasibility. Method 1 new lumbar transpedicular dynamic fixation system development: measurements in 20 healthy subjects L1-L5 segment pedicle width, height, the pedicle channel length (center distance of the edge of the cortex vertebral pedicle leading edge midpoint), segmental vertebral activities. Based on imaging data, design ideas, medical device company commissioned Watson manufacturing samples. 2 new lumbar dynamic fixation rods traditional strong fixed rod mechanics test: as the subjects were randomly selected five dynamic fixation rods with 5 strong fixation rods, respectively, by the universal testing machine load varying degrees of load, record dynamic fixed rod group and firm fixed rod group change under different load displacement and draw force curve, combined with trigonometric tables to calculate the degree of flexion, the processing and analysis of data entered into the computer, compare the difference. The results of a top-down, the height of the lumbar pedicle gradually reduce gradually widened pedicle width, the pedicle channel length differences not lumbar segmental activity gradually increasing L4/L5 segment. The 2 200N physiological load, dynamic buckling of fixing rods degrees of 6.6 ° ± 1.1 °, the flexion and extension range of from 0 ° to 15.4 °. Dynamic fixed rod groups with strong fixed rod group in flexion exist significant differences were statistically significant (P lt; 0.05). Conclusions of the internal fixation system designed and manufactured to meet the pedicle structural characteristics and physiological characteristics of the lumbar activity, dynamic fixation rods in flexion and extension, lateral bending, rotation direction to retain a certain degree of activity, is a new type of lumbar passing the pedicle dynamic fixed system. Two in 200N physiological load, dynamic flexion fixing rods of 6.6 ° ± 1.1 °, the flexion and extension range of from 0 ° to 15.4 °, is superior to traditional strong fixing rods close to the activity in the normal lumbar.

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CLC: > Medicine, health > Surgery > Orthopaedic Surgery ( movement system diseases,orthopedic surgery ) > Orthopedic surgery and surgery > Bone surgery
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