Bone Plate Protrusion for Compression Without Dead Space
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Solution Overview
Problem
Existing bone plate kits face issues with low fixing force due to partially threaded screw holes, increased dead space leading to infection risks, and increased plate thickness causing pressure on surrounding soft tissue.
Innovation Solution
A bone plate design featuring screw holes with a protrusion and recess on the upper face, allowing for proper pressure application between bone segments without compromising fixing force or increasing dead space, and incorporating a chamfer for bone screw placement to manage plate movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If screw threads are formed partially in the screw holes, then the plate thickness can be reduced, but the fixing force decreases and dead space increases leading to infection risk
Solution Approach 1:
The screw hole is divided into two distinct portions: a first portion with screw threads for fixation and a second portion without screw threads for pressure application. This segmentation allows each portion to serve its specific function optimally, maintaining fixing force while enabling pressure application without requiring increased plate thickness.
Solution Approach 2:
Different portions of the screw hole have different structural characteristics - the first portion has threads for mechanical engagement while the second portion is smooth for pressure transmission. This local differentiation allows the plate to achieve both fixation and compression functions without compromising strength or increasing overall thickness.
2Length of stationary object
If screw threads are formed partially in the screw holes, then the plate thickness can be reduced, but dead space increases leading to infection risk
Solution Approach 1:
The screw hole is divided into two distinct portions: a first portion with screw threads for fixation and a second portion without screw threads for pressure application. This segmentation allows each portion to serve its specific function optimally, maintaining fixing force while enabling pressure application without requiring increased plate thickness.
3Force
If the plate thickness is increased to apply pressure between bone segments, then pressure application is improved, but pressure on surrounding soft tissue increases
Solution Approach 1:
The screw hole is divided into two distinct portions: a first portion with screw threads for fixation and a second portion without screw threads for pressure application. This segmentation allows each portion to serve its specific function optimally, maintaining fixing force while enabling pressure application without requiring increased plate thickness.
Solution Approach 2:
The bone screw acts as an intermediary element that transmits compressive force from the surgeon's tightening action through the second portion of the screw hole directly to the bone segments, enabling precise pressure control without the plate itself needing to be thicker.
Data Source
Figure 1~2
Figure 3~5
Figure 6~7
AI summary
In order to apply, with a simple and easy means, proper pressure between bone segments spaced apart as a result of osteotomy or a bone fracture, without lowering the fixing force at the screw meshing portion, without increasing a dead space, and without increasing the thickness of the plate, the present invention provides a bone plate (2) having an upper face (4), which is to be in contact with bone, a lower face, which is to be in contact with the bone, and a plurality of holes (6) arranged to receive bone screws and connecting the upper face (4) and the lower face. In at least one of the holes (6), a portion of an edge, on the upper face (4), of the hole (6) is formed so as to be raised in the form of a protrusion higher than the upper face around the hole (6).