Acromioclavicular Plate Assembly With Hinged Joint Fixation
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Solution Overview
Problem
Existing acromioclavicular steel plates are prone to dislocation due to insufficient stability and frictional issues, leading to potential bone injury and dislocation, especially when the joint moves by 20 degrees in all directions.
Innovation Solution
An acromioclavicular steel plate assembly with a clavicle steel plate and an acromion steel plate, featuring a positioning head with limiting protrusions and a spherical hinge protrusion that allows for a hinged connection, ensuring stable fixation and allowing the joint to move normally by 20 degrees without dislocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a hook steel plate is used to resist upward dislocation of the clavicle, then the dislocation resistance is improved, but the hook may scrape the acromion bone or protrude into the shoulder joint during movement, causing bone injury and pain
Solution Approach 1:
The patent replaces the fixed hook structure with a dynamic hinged connection system. The positioning head with spherical hinge protrusion allows the clavicle steel plate to rotate and adapt to the 20° movement range of the acromioclavicular joint, preventing the hook from scraping or protruding into the shoulder joint while maintaining dislocation resistance
Solution Approach 2:
The steel plate is divided into two separate components: an acromion steel plate fixed to the acromion and a clavicle steel plate fixed to the clavicle. These segments are connected through a hinged positioning mechanism, allowing independent movement of each bone while maintaining joint stability, thus avoiding bone injury from a fixed hook structure
2Stability of the object's composition
If an acromion steel plate with screw fixation is used, then the initial stability is improved, but under dislocation forces the screw is highly likely to be pulled out and fail
Solution Approach 1:
The hinged connection between the acromion steel plate and clavicle steel plate allows dynamic adjustment during joint movement. The positioning head can rotate within the hinged connection, distributing dislocation forces more effectively and reducing the pullout force on the screws compared to a rigid fixed structure
Solution Approach 2:
The patent changes the mechanical parameters of the connection system by introducing a hinge with rotational degrees of freedom. This allows the system to accommodate the 20° movement range of the joint while maintaining stable fixation, preventing screw pullout under dislocation forces
3Stability of the object's composition
If the positioning head width is increased to improve transverse limitation, then the stability is improved, but the positioning head cannot pass through the avoidance gap for installation
Solution Approach 1:
The positioning head transitions from a static wide structure to a dynamic assembly that can change its effective width during installation. The limiting protrusions can be positioned to allow passage through the avoidance gap, then the hinged connection engages to provide the necessary transverse limitation stability
Solution Approach 2:
During installation, the positioning head is temporarily positioned to pass through the avoidance gap before final engagement. The hinged connection is engaged in advance to provide transverse limitation, separating the installation phase from the functional phase requirements
Data Source
AI summary
An acromioclavicular steel plate assembly includes an acromion steel plate and a clavicle steel plate, one end of the clavicle steel plate has a positioning head, the acromion steel plate is an integrated steel component with three perpendicular acromion planes in a U shape, the three acromion planes being a body, a first fixing portion, and a second fixing portion, a notch is arranged on a side surface of the first fixing portion, a first avoidance gap is provided in the body, two convex limiting protrusions and a convex spherical hinge protrusion are arranged on three side surfaces of the positioning head respectively, the positioning head can pass through the first avoidance gap and embed the spherical hinge protrusion into the notch, and a total width of the positioning head at the two limiting protrusions is greater than a width of the first avoidance gap.