The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 21, 2015
Filed:
Nov. 05, 2010
Applicants:
Xiaoyi Wen, Shanghai, CN;
Jie LI, Shanghai, CN;
Zhenjie LV, Shanghai, CN;
Daozhi Liu, Shanghai, CN;
Inventors:
Assignee:
Shanghai Microport Orthopedics Co., Ltd., Shanghai, CN;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
A61B 17/86 (2006.01);
U.S. Cl.
CPC ...
A61B 17/863 (2013.01); A61B 17/8625 (2013.01);
Abstract
A bone screw comprises a threaded portion. The threaded portion has a first thread including a first front surface (), a first back surface () and a crest. A second thread including a second front surface () and a second back surface () is formed on at least part of the crest of the first thread. Because of the presence of the second thread, a contact area between the screw and a bone and an axial pullout force-bearing area are both significantly increased, without significantly influencing the bending resistance, so that the mechanical property of the screw is entirely improved.