Anti-rotation and anti-retreating double-thread hollow screw

A double-threaded, hollow screw technology, used in internal fixators, internal bone synthesis, fixators, etc., can solve problems such as fixation failure, reduce the possibility of bending or fracture, improve pullout resistance, and increase the contact area. Effect

Active Publication Date: 2021-04-30
北京中安泰华科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, based on years of clinical experience, the inventor found that the hollow screw may be withdrawn and rotated due to improper movement of the patient during the recovery period of the patient, resulting in failure of fixation
[0005] In view of the related technologies mentioned above, the inventor believes that the traditional hollow screw has the defects of screw back and rotation

Method used

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  • Anti-rotation and anti-retreating double-thread hollow screw
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  • Anti-rotation and anti-retreating double-thread hollow screw

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] The embodiment of the present application discloses a double-threaded hollow nail with anti-rotation and anti-retreat. refer to figure 1 and figure 2 , the double-threaded hollow nail includes a screw body 1, a solid rod inner core 2 and a lock 3, all of which are made of titanium alloy material. Titanium alloy material has good biocompatibility, better strength and toughness, and meets medical requirements. Require.

[0048]The interior of the screw body 1 is hollow and open at both ends. During installation, it is positioned and guided by Kirschner nails; after the screw body 1 is in place, the solid rod inner core 2 is slid and plugged into the screw body 1 through a special supporting tool , used to strengthen the strength of the screw main body 1, and at the same time play the role of anti-rotation and anti-retreat, so as to ensure the stability of the double-threaded hollow screw after installation, and reduce the incidence of complications such as fracture non...

Embodiment 2

[0059] The embodiment of the present application discloses an anti-rotation and anti-retreat double-threaded hollow nail, which is different from Embodiment 1 in that it is a lock.

[0060] refer to Figure 6 , the lock 3 includes a sleeve 35 fixedly connected to the end of the solid rod inner core 2 away from the insertion rod 22 and having a diameter smaller than that of the solid rod inner core 2. The sleeve 35 is coaxially arranged with the solid rod inner core 2 and slides inside the sleeve There is a slide bar 36, and an anti-off structure is arranged between the slide bar 36 and the sleeve 35. The anti-off structure can be a position-limiting convex ring fixed on the inner wall of the sleeve 35 away from the end of the solid rod inner core 2 and the slide bar 36. The limit convex ring near the end of the solid rod inner core 2.

[0061] refer to Figure 6 and Figure 7 A cylindrical end cap 37 is affixed to the end of the slide rod 36 away from the sleeve 35, the out...

Embodiment 3

[0065] The embodiment of the present application discloses an anti-rotation and anti-retreat double-threaded hollow nail, which is different from the embodiment 1 in that the locking element and the inner core of the solid rod.

[0066] refer to Figure 8 , the lock 3 includes a lock head 31, a first threaded rod 32, a polished rod 41 and a limit post 42 which are coaxially arranged in sequence and integrally formed, and the diameter of the limit post 42 is smaller than the first threaded rod 32 and larger than the polished rod 41; the solid rod The end of the inner core 2 away from the insertion rod 22 is sequentially processed with a communication groove 24 and a limiting groove 25 inwardly along the axial direction. The limiting groove 25 is matched with the limiting column 42. One radial side of the rod inner core 2 penetrates through.

[0067] refer to image 3 and Figure 8 , when installing the solid rod inner core 2, place the limit column 42 in the limit groove 25,...

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Abstract

The invention relates to the field of medical screws, and in particular, relates to an anti-rotation and anti-retreating double-thread hollow screw which comprises a screw main body, and the interior of the screw main body is hollow and the two ends of the screw main body are provided with openings; the screw main body comprises a columnar rod body and a screw tail integrally formed at one end of the columnar rod body, and a tail external thread is processed on the outer wall of the end, close to the screw tail, of the columnar rod body; and a head multi-thread is processed on the outer wall of the end, away from the screw tail, of the columnar rod body, and the lead of the tail outer thread is larger than or smaller than that of the head multi-thread. According to the anti-rotation and anti-retreating double-thread hollow screw, due to the arrangement of the tail external thread and the head multi-thread, when the double-thread hollow nail is screwed into a bone, a displacement difference is formed, so that the pressurizing and anti-pulling effects are achieved, and the possibility that the double-thread hollow nail retreats and rotates after being implanted is reduced; and meanwhile, a solid rod inner core is arranged in the screw main body, so that the strength of the hollow screw is greatly improved.

Description

technical field [0001] The present application relates to the field of medical screws, in particular to an anti-rotation and anti-retreat double-threaded hollow screw. Background technique [0002] Cannulated screws are mainly used in the surgery of limb fractures and fixation of fracture fragments. Hollow screws are usually made of stainless steel or titanium, and have a hollow structure inside, through which Kirschner wires can pass to facilitate the implantation of the hollow screw. [0003] Hollow screw implantation is generally divided into three steps: the first step is to drive the Kirschner wire into the nail at the fracture site; the second step is to put the hollow screw on the Kirschner wire and twist it into the bone along the Kirschner wire until it is fixed. position; the third step, take out the Kirschner wire. [0004] However, according to years of clinical experience, the inventors found that the hollow screw may be withdrawn and rotated due to improper m...

Claims

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Application Information

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IPC IPC(8): A61B17/72
CPCA61B17/725
Inventor 孙令胜周中位罗爱民
Owner 北京中安泰华科技有限公司
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