Slip-type lock bone nail
A technique for loosening bone nails and inserts, which is applied in the field of medical devices and can solve problems such as the inability to fundamentally prevent the loosening of bone nails.
Inactive Publication Date: 2010-06-09
宁波市鄞州千峰机械科技有限公司
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Problems solved by technology
[0003] The "anti-loosening bone screw" with the patent number 200820077417.8 uses thread segments with unequal pitches to destroy the loosening path of the bone screw. However, the loosening process of the bone screw is a process of rotating counterclockwise in vibration along the thread direction. Even if thread segments with different pitches are set, the loosening of the bone screw cannot be fundamentally prevented because the thread directions of different thread segments are consistent.
Method used
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Embodiment Construction
[0013] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0014] The insert type anti-loosening bone screw is composed of an insert 1, a slot 2 and a screw body 3. Wherein, the screw body 3 is a pair of stainless steel screws with the same shape and size, and the top of each screw body 3 has a Pozi-shaped slot 2 . The cutting strip 1 is a hard plastic strip whose plane is a double cross. The two cross-shaped plastic strips forming the cutting strip 1 are respectively located in each Pozi-shaped slot 2 . When the bone needs to be fixed, one of the screw bodies 3 is first screwed into the bone, and then the other screw body 3 is screwed into the bone close to the side wall of the previous screw body 3 and the upper ends of the two screw bodies 3 are screwed into the bone. Slot 2 is oriented the same way. Knock the cutting strip 1 into the slot 2 with a hammer.
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The invention relates to a medical appliance, in particular to a slip-type lock bone nail consisting of a slip, a slot and a screw body. The slip-type lock bone nail is characterized in that the screw body consist of a pair of stainless steel screws with the same shape and size; a double crosses-shaped slot is arranged at the top of each screw body; the slip is a hard plastic strip with a dual-cross shaped plane; and two cross-shaped plastic strips forming the slip are respectively located in each slot shaped like a Chinese character mi. During operation, a screw body is firstly screwed in the bone, the other screw body is screwed in the bone close to the side wall of the previous screw body, wherein the direction of the slots at the upper ends of the two screw bodies is the same, and finally, the slip is inserted in the slot. The invention improves the fixing effect of the bone nail and avoids pain caused by knocking in the bone nail for the second time.
Description
technical field [0001] The invention relates to a medical device, in particular to an insert type anti-loosening bone nail. Background technique [0002] The bone screws currently used clinically are all based on the structure and shape of civilian screws. Because the bones of the human body need to support muscles for various movements, many conventional bone screws will loosen after implantation, so patients have to be implanted again. Going into the bone nail brings pain to the patient. [0003] The "anti-loosening bone screw" with the patent number 200820077417.8 uses thread segments with unequal pitches to destroy the loosening path of the bone screw. However, the loosening process of the bone screw is a process of rotating counterclockwise in vibration along the thread direction. Even if thread segments with different pitches are provided, the loosening of the bone screw still cannot fundamentally be prevented because the thread directions of different thread segments...
Claims
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IPC IPC(8): A61B17/86
Inventor 许小玲
Owner 宁波市鄞州千峰机械科技有限公司