Anti-rotating self-locking bone fracture internal fixing device

An internal fixator and anti-rotation technology, applied in the directions of internal fixator, fixator, internal bone synthesis, etc., can solve problems such as inapplicable fractures, and achieve the effect of clear effect, shortened operation time, and reliable anti-rotation effect.

Inactive Publication Date: 2008-02-06
PEOPLES HOSPITAL PEKING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this technique is not currently applicable to fractures of the femoral neck or other parts of the

Method used

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  • Anti-rotating self-locking bone fracture internal fixing device
  • Anti-rotating self-locking bone fracture internal fixing device
  • Anti-rotating self-locking bone fracture internal fixing device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Example 1 The structure of the anti-rotation self-locking fracture internal fixator with tooth patterns on the back section of the screw rod and the end surface of the sleeve:

[0044] See attached drawings 1 to 8. The structure of the internal fixator for anti-rotation self-locking fractures consists of the screw rod shown in Fig. 1, the built-in connecting bolt shown in Fig. 2 and Fig. 3, and the three-winged internal fixator shown in Fig. It consists of a sleeve, and the three parts are hollow structures.

[0045] The screw part has three helical blades 1, which are used to drive into the femoral head. The head end of the blade is in the shape of a spiral cone to facilitate penetration into the cancellous bone. The linear length of the helical blade part is between 15mm and 30mm; The front part with the helical blade is thicker, and the middle part of the rear part of the screw is thinner, so as to occupy the smallest fracture area when driving into the femoral neck....

Embodiment 2

[0059] Example 2 An anti-rotation self-locking fracture internal fixator with tooth patterns on the end surface of the rear end of the screw rod and the inner surface of the sleeve

[0060] Except that the end surface of the rear section of the screw and the end surface of the sleeve do not have tooth lines, and the tooth lines are on the end surface of the end of the rear section of the screw rod and the inner surface of the sleeve, the rest of the structure is the same as that of Embodiment 1.

[0061] During the operation, the fixers in the unlocked state and locked state are shown in Fig. 11 and Fig. 12 respectively. Since the teeth are inside the sleeve, they are not shown in the figure.

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Abstract

An anti-rotation self-locking fracture internal fixer consists of a screw stem, a sleeve and a bolt, wherein the front section of the screw stem is provided with a spiral blade, while the end head of the rear section is provided with a connecting structure connected with one end of the bolt; the outside diameter of at least the nesting-in part near the end head of the rear section of the screw stem is less than the inside diameter of the front end of the sleeve contacting the screw stem; the bolt is nested inside the sleeve to connect the screw stem and the sleeve together; the external surface of the bolt is provided with external thread, while corresponding part of the internal surface of the sleeve is provided with internal thread; the external surface of the end head of the sleeve far away from the far end of the screw stem is provided with sheetlike wings; in addition, the rear section of the screw stem and the sleeve are provided with a rotary limit structure. During use, the fixer is arranged in 'locking' status after the bolt is screwed up; moreover, the wings arranged on the sleeve have anti-rotation function, thereby preventing loosening of the fixer. The fixer has a simple operation, short surgery time, reduction loss of bone quantity and being beneficial to healing of fracture, thereby being particularly suitable for therapy of neck of femur fracture patient with bone loss.

Description

Technical field: [0001] The invention relates to an anti-rotation self-locking fracture internal fixer, in particular to a fracture internal fixer with a helical blade and a winged sleeve, which can be automatically locked and anti-rotation. Background technique: [0002] Fracture internal fixation is an effective means of fracture treatment. Most of the internal fixators currently used are screws, and several screws are often used to fix them. Moreover, the screw is easy to gradually loosen or partially withdraw after being driven into the bone. Among the patients who are prone to fracture, most of them are osteoporotic patients, whose cancellous bone has less holding force on the thread, so the phenomenon of screw rotation or loosening is more prominent. [0003] For example, for a fracture of the femoral neck, the maximum anti-rotational stability can only be obtained if three screws are inserted and arranged in a "pin" shape, and neither one nor two screws can provide ...

Claims

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Application Information

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IPC IPC(8): A61B17/68A61B17/76A61L31/02
Inventor 杨明姜保国张殿英傅中国陈建海徐海林王天兵张宏波
Owner PEOPLES HOSPITAL PEKING UNIV
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