Pedicle screw with barbs, and pusher and method for forming pedicle screw
A pedicle screw and pusher technology, applied in the field of spine surgery, can solve the problems of non-absorbable bone cement, toxin release, non-biodegradation and the like
Active Publication Date: 2014-03-26
SUZHOU MINIMALLY INVASIVE SPINAL TRAUMA MEDICAL TECH CO LTD
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- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0008] However, bone cement is not absorbed in the human body and is not biodegradable
Also, bone cement exotherms as it polymerizes, resulting in necrosis of the surrounding cancellous bone and release of toxins
The above-mentioned shortcomings have limited the application of bone cement to a certain extent.
Method used
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Embodiment Construction
[0039] Embodiments of the present invention are described below with reference to the drawings.
[0040] figure 2 Perspective view of pedicle screw with barb installed is shown. The pedicle screw includes a head 1 with internal threads and a screw rod 3 with external threads. Extending along the axis of the pedicle screw in the screw rod 3 is an impermeable lumen 7 with one end open toward the head, and a plurality of through holes 6 communicating with the lumen 7 are provided on the external thread in a manner inclined relative to the axis ,Such as Figure 3A-3B shown. In this example, as Figure 4B As shown, the barb 2 is an elastically expandable V-shaped structure, which fits in the through hole 6 in a buckle manner and protrudes from the through hole 6 . exist figure 2 In the illustrated embodiment, two V-shaped barbs 2 are mounted on the pedicle screw.
[0041] Figure 4 A view of the pusher 10 of the present invention is shown. The pusher 10 is composed of a ...
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The invention relates to a pedicle screw with barbs, and a pusher and a method for forming the pedicle screw. The pedicle screw comprises a head and a threaded rod. The head is provided with internal threads, the threaded rod is provided with external threads, a blind inner cavity extends in the threaded rod along the axis of the pedicle screw, one end of the blind inner cavity is open towards the head, one or a plurality of through holes which are communicated with the inner cavity are formed in the external threads, and the elastic expandable barbs are clipped in the through holes and extend out of the through holes. The pedicle screw, the pusher and the method have the advantages that the pedicle screw is provided with the barbs and is simple in structure and easy to mount; the pulling resistance and the radial stability of the pedicle screw can be improved, an anchoring effect can be improved for an implantation material for a patient suffering from vertebral bone density loss, and indications can be increased.
Description
technical field [0001] The present invention relates to the field of orthopedic implants, in particular spinal surgery, such as implants for the treatment or repair of spinal diseases in patients. Background technique [0002] Spine surgery has been performed for decades to treat or repair spinal disorders in patients. Known screw-rod systems for posterior spinal surgery generally consist of pedicle screws, connecting rods, transverse couplers, and lock nuts. By assembling the screw-rod system to combine with the vertebral body to form a fixed frame to stabilize the spinal segment to be treated within the frame. [0003] In the screw-rod system, the pedicle screws implanted in the vertebral body play a key role. The current pedicle screw fixation technology can achieve safe and robust short-segment spinal fixation. This technique has been widely used in spinal surgery. However, this technique has the problems of internal fixation failure such as screw loosening and screw...
Claims
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IPC IPC(8): A61B17/86A61B17/70A61B17/88
CPCA61B17/86A61B17/7032A61B17/866A61B17/70A61B17/8685A61B17/8625A61B2017/8655
Inventor 田芳高耀平林忠陈伟
Owner SUZHOU MINIMALLY INVASIVE SPINAL TRAUMA MEDICAL TECH CO LTD