Cranked Tibial Bone Plate for Stable Fixation of Displaced Fragments
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Solution Overview
Problem
Existing bone plates for tibial condylar valgus osteotomy (TCVO) fail to securely fix bone fragments that are significantly displaced and protrude inward, leading to potential dislodgment and soft tissue strain due to their design not conforming to the unique shape of the shin bone.
Innovation Solution
A bone plate with a cranked shape, featuring a twisted main section and transverse section, offset to fit the shin bone's surface, and through-holes for secure fixation using bone screws or pins, ensuring stable attachment to both diaphysis and epiphysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional bone plate design is used, then the bone plate can be manufactured with simple geometry, but it fails to conform to the complex shape of the shin bone where the epiphysis protrudes, resulting in poor fixation stability
Solution Approach 1:
The bone plate incorporates a cranked shape with curved surfaces instead of flat or straight geometry. The plate features a first portion that contacts the diaphysis and a second portion that contacts the protruding epiphysis, with a curved transition region that conforms to the natural contours of the shin bone. This curvature enables the plate to adapt to the complex bone geometry, improving fixation stability without requiring overly complicated structural designs.
Solution Approach 2:
The bone plate transitions from a two-dimensional flat plate to a three-dimensional cranked structure with multiple portions extending in different directions. The plate includes a first portion extending in a first direction to contact the diaphysis, a second portion extending in a second direction to contact the epiphysis, and a third portion extending in a third direction, creating a multi-dimensional configuration that matches the spatial arrangement of the bone surfaces.
2Reliability
If the bone plate is designed to conform to the protruding epiphysis shape, then fixation stability improves, but the manufacturing precision requirements increase
Solution Approach 1:
The bone plate is divided into distinct segments or portions, each designed to contact a specific region of the bone. The plate includes a first portion for the diaphysis, a second portion for the epiphysis, and a third portion for additional support. This segmentation allows each portion to be optimized for its specific function while simplifying the overall manufacturing process, as each segment can be formed using standard curvilinear shaping techniques rather than requiring complex integrated geometries.
3Reliability
If the bone plate uses a cranked shape with offset sections, then it secures displaced bone fragments effectively, but the device complexity increases
Solution Approach 1:
The bone plate features an asymmetric cranked shape where the first portion, second portion, and third portion are positioned at different locations and orientations relative to each other. The second portion is offset from the first portion to specifically contact the protruding epiphysis, while the third portion extends in a different direction to provide additional stabilization. This asymmetric configuration is tailored to the specific anatomical asymmetry of the injured bone, securing displaced fragments effectively without requiring symmetric or overly complex structural elements.
Data Source
AI summary
A bone plate including a long-plate-shaped main section to be disposed on a side surface of a diaphysis, a transverse section to be disposed on the side surface of an epiphysis, a coupling section coupling the transverse section and the main section to each other. The main section is twisted relative to the transverse section around an axis parallel to a longitudinal axis of the main section. when the bone plate is viewed in a transverse direction of the main section, the bone plate has a shape in conformity to the shin bone such that the coupling section is inclined relative to a longitudinal direction of the main section and the main section and the transverse section are bent to have a cranked shape in which the main section and the transverse section are offset relative to each other in a thickness direction of the bone plate.