Osteosynthetic Device with Rotational Blade for Bone Fixation
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Solution Overview
Problem
Existing osteosynthetic devices for fracture fixation in osteoporotic bone lack sufficient anchorage strength against multiple directional loads and are difficult to implant without causing loss of reduction during procedures.
Innovation Solution
A bone screw with a wing-like blade that provides improved load-bearing capacity and rotational strength by allowing rotational blocking between the screw and blade, enabling secure fixation without hammering and reducing the risk of implant cutting through cancellous bone.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a traditional bone screw is used, then the device is easy to implant, but the anchorage strength against perpendicular loads is insufficient
Solution Approach 1:
The invention combines a bone screw with a wing-like blade to create a hybrid osteosynthetic device. The screw provides ease of implantation through rotational insertion, while the blade extends perpendicular to the screw axis to provide enhanced anchorage strength against loads perpendicular to the long axis. This merging of two different fixation elements into one integrated device resolves the contradiction between ease of implantation and perpendicular load resistance.
2Strength
If a blade type device is used, then the load bearing capacity is improved, but the insertion procedure becomes difficult and may cause loss of reduction
Solution Approach 1:
The hybrid device merges the advantages of both screw and blade types. The screw portion enables easy rotational insertion without hammering, preserving reduction, while the integrated blade portion provides enhanced load bearing capacity. The blade is positioned perpendicular to the screw axis, allowing it to bear loads effectively while being inserted through the same minimal invasive approach as a standard screw.
3Strength
If a larger diameter screw is used, then the anchorage strength is improved, but the device complexity increases
Solution Approach 1:
Instead of increasing the diameter of the screw in one dimension, the invention adds a blade element that extends in a perpendicular dimension. This dimensional transition allows the device to achieve enhanced anchorage strength without increasing the screw diameter or overall device complexity significantly. The blade provides additional surface area for load distribution in a different spatial orientation.
Data Source
AI summary
The osteosynthetic device for the fixation of a bone or bone fragments has a longitudinal axis (6) and comprises a bone screw (1) with a shaft (2) bearing a thread (3), a front end (4) and a rear end (5), said thread (3) having a maximum outer diameter d; and a wing-like blade (7) with a leading end (8) being connected to the front end (4) of the bone screw (1) and a trailing end (9) being connected to the rear end (5) of the bone screw (1). The blade (7) is further provided with a coaxial longitudinal aperture (17) having a length I extending between the leading end (8) and the trailing end (9) and a width w≧d. Further the blade (7) is coaxially and rotatably mounted on said shaft (3) of said bone screw (1).