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作者设计了一种深浅移动式椎板自动拉钩,通过3年临床实践效果较理想,现将该拉钩的研制及临床应用作一介绍.
The author designed a kind of deep and shallow moving laminar auto-pulling hook. After three years of clinical practice, the results are satisfactory. Now the development and clinical application of the pull-hook are introduced.