Nut downward-screwed type cutting sleeve shaped screw
A technology of screws and nuts, which is applied in the field of nut screw-down ferrule-type screws, can solve the problems of long operation time, cumbersome operation, and difficult operation, and achieve the effect of reducing operation difficulty, reducing patient pain, and saving operation time
Active Publication Date: 2016-10-12
JILIN UNIV
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Problems solved by technology
[0003] The purpose of the present invention is to propose a screw with a nut screw-down ferrule, which solves the problems of cumbersome operation, long operation time and difficult operation in the prior art.
Method used
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Embodiment Construction
[0018] Embodiments of the present invention will be further described below in conjunction with the accompanying drawings.
[0019] See attached figure 1 And attached figure 2 , the nut screw-down ferrule type screw of the present invention comprises: an external connecting rod 1, a screw back seat 2, a nut 3 and a screw root nail 4; The screw backseat 2 is deformed accordingly under different screwing conditions. By rotating the nut 3 downward, the screw backseat 2 can be squeezed and deformed to the inside until it reaches a certain proper position. By turning the nut 3 upward, the screw backseat 2 can be deformed. Restorative deformation, gradually returning to the original shape; the external connecting rod 1 is located inside the screw back seat 2, which can be adjusted relatively during the operation, and the posture of the external connecting rod 1 is determined according to the patient's condition, and then the external connecting rod 1 is fixed to the screw back sea...
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The invention discloses a nut downward-screwed type cutting sleeve shaped screw, and belongs to the technical field of medical apparatuses, aiming at solving the problems of the prior art which is complex in surgical operation, long in operation time and high in operation difficulties. The screw comprises an outer connecting rod, a screw rear base, a nut and a screw pedicle, wherein the screw rear base is of an integrated U-shaped structure; the upper part of the screw rear base is represented as a conical structure with overall dimensions gradually increasing from top to bottom and the lower part of the screw rear base is represented as a spherical structure; a cylindrical groove, which is perpendicular to the axis of the screw rear base, is formed in the upper part of the conical structure, and the inner surface of the spherical structure is a spherical surface; the outer connecting rod and the cylindrical groove are matched; a ball head on the upper part of the screw pedicle is matched with the spherical structure of the screw rear base; the nut is in threaded connection to the outer surface of the screw rear base; and between the outer connecting rod and the screw rear base, transformation from movable connection to fixed connection is achieved as the nut is screwed in the screw rear base, and between the screw pedicle and the screw rear base, transformation from movable connection to fixed connection is achieved as the nut is screwed in the screw rear base.
Description
technical field [0001] The invention belongs to the technical field of medical devices, and in particular relates to a nut screw-down ferrule type screw. Background technique [0002] At present, bone nails are usually used for clinical fracture surgery. The polyaxial bone screws in the prior art include a screw root body, a back seat and a nut. During the operation, the screw root body needs to be screwed into the surgical position, adjust the placement position of the connecting rod according to the patient's physiological curvature, and then use a tool to lock the nut; because in the prior art, the screw root body and the back seat must be assembled before being screwed into the human body, the two are locked It can be relatively movable within a certain range before tightening, which will interfere with the screwing in of the screw root during the operation; at the same time, the nut must be installed last and there are certain requirements for the length of screwing in ...
Claims
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Login to View More IPC IPC(8): A61B17/86
CPCA61B17/8605A61B17/8625A61B17/8665
Inventor 陈延礼石陆军杨嵩王辉李传龙刘文弢孙化鹏
Owner JILIN UNIV