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Expanding type spongy bone hollow screw

A hollow screw and cancellous bone technology, applied in the field of medical devices, can solve the problems of loosening and prolapse of internal fixation screws, failure of fixation, insufficient lifting and fixing strength, etc., so as to improve the anti-pullout strength and anti-rotation strength, and increase the stability. and reliability, and the effect of reducing the incidence of surgical failure

Inactive Publication Date: 2007-01-24
FOURTH MILITARY MEDICAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

However, due to the insufficient lifting and fixing strength of cancellous bone screws commonly used in clinical practice, it often leads to postoperative fracture displacement, screw loosening and prolapse, and final fixation failure.
Especially for the common clinical femoral neck fractures in the elderly, because most patients have osteoporosis, it is difficult for ordinary cancellous bone screws to achieve the purpose of anti-rotation and anti-sliding, so internal fixation screws often loosen and fall out.

Method used

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  • Expanding type spongy bone hollow screw
  • Expanding type spongy bone hollow screw
  • Expanding type spongy bone hollow screw

Examples

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Embodiment Construction

[0012] refer to figure 1 , 2 , 3, the present invention is composed of two parts, an outer screw 1 and an inner bolt 2, one end of the outer screw 1 is a tip 4, the other end of the outer screw 1 is spherical, and there is an outer thread 5 behind the tip 4, and the outer thread 5 is a self- Tapped cancellous bone threads. There are two front and rear end channels 6,7 with different diameters in the center of the outer screw 1. The diameter of the front end channel 6 is smaller than the diameter of the screw rear end channel 7, and the junction of the front and rear end channels 6 and 7 is tapered. Internal threads matching the internal bolts 2 are provided on the inner wall of the rear end channel 7 . At the tip portion 4 of the outer screw 1, two or four lobes of expansion gaps are uniformly cut from the tip along the axial direction, and the expansion gaps extend to behind the junction of the tapered channel. The other end of the outer screw 1 is spherical, with a hole ...

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Abstract

The expanding bolt for use in spongy bone includes one outer screw a one inner screw. The outer screw in integral structure has one tip end, one outer thread section, one spherical end and one inside hole including one front section of small diameter and one back section with inner threads. The front part of the outer screw is cut to form two or four expansion slots. The inner screw matched with the inner treads of the outer screw has one conic tip, threads and socket head for screwing in. There is also one tip steel pin matching the front section of the outer screw. The present invention is for inner fixing of fracture and has high stability and reliability.

Description

technical field [0001] The invention belongs to medical appliances, in particular to a novel medical expandable cancellous bone hollow screw. Background technique [0002] Femoral neck fractures, slipped epiphysis of the femoral head, femoral neck base fractures, femoral condyle fractures, and tibial plateau fractures all belong to cancellous bone fractures. The current treatment methods are mainly surgery, open reduction and internal fixation of fractures. In addition, sacroiliac joint injuries, acetabular, and pelvic fractures caused by various reasons usually require surgical internal fixation. Internal fixation devices mainly use cancellous bone screws to fix the fracture ends. However, due to the insufficient lifting and fixing strength of cancellous bone screws commonly used in clinical practice, it often leads to postoperative fracture displacement, screw loosening and prolapse, and final fixation failure. Especially for the common clinical femoral neck fractures in...

Claims

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Application Information

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IPC IPC(8): A61B17/86A61B17/76
Inventor 雷伟吴子祥
Owner FOURTH MILITARY MEDICAL UNIVERSITY
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