Bone Fixation Device With Sandwiching Screw Mechanism
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Solution Overview
Problem
Conventional bone hooks used in spinal fixation methods are prone to detachment from bone elements and lack the firm fixation provided by screws, leading to instability in spinal curvature correction and stability.
Innovation Solution
A bone fixation device featuring a base section with a rod holder, a hook with a flat arm, and a sandwiching part with a screw mechanism that securely accommodates and fixes bone elements by sandwiching them between the hook and the sandwiching part, ensuring reliable attachment and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional bone hook is used to fix bone elements, then the device structure is simple and easy to install, but the bone hook is easily detached from bone elements and cannot firmly fix the bone elements
Solution Approach 1:
The invention merges the functions of a bone hook and a bone screw into a single integrated device. The bone fixation device includes both a hook portion for engaging bone elements and a screw portion for firm fixation, combining the advantages of both conventional devices while eliminating the detachment problem
Solution Approach 2:
The bone fixation device is segmented into distinct functional portions: a hook portion with a curved arm for initial engagement and positioning, and a screw portion with threads for firm fixation. This segmentation allows each portion to perform its specific function optimally while working together as an integrated system
2Strength
If a bone hook is used instead of a bone screw, then the installation process is simpler, but the fixation strength and resistance to detachment are insufficient
Solution Approach 1:
The hook portion performs preliminary action by first engaging with the bone element to establish initial fixation and proper positioning. This preliminary engagement facilitates easier installation, after which the screw portion is advanced to provide firm fixation, maintaining both ease of operation and high fixation strength
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The device achieves reliable and stable fixation of bone elements by securely sandwiching them between the hook and the sandwiching part, providing a firm connection that resists detachment and disperses loads evenly, thus enhancing the stability of spinal fixation.
Implementation Method 1
a sandwiching part (40, 40A) that is installed to the base section (20) and that is configured to sandwich the bone element (5) together with a part of the hook (30)
Implementation Method 2
the sandwiching part (40, 40A) has a shaft section (61) formed with a screw, the screw being formed on the outer peripheral surface of the shaft section (61) in which to be screwed together with a screw formed on the through hole
Data Source
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AI summary
To provide a bone fixation device able to firmly fix bone elements. A bone fixation device, comprising: a base section having a first space that holds a rod; a hook formed with a second space in which a bone element is accommodated together with a art of the base section; and a sandwiching part that is installed to the base section and that sandwiches the bone element which has been accommodated in the second space together with a part of the hook, wherein the sandwiching part is shiftable allowing attachment to the bone element.