Patient-Specific Registration Instrument for Osteosynthesis
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for osteosynthesis, particularly in complex joint fractures, face challenges in accurately repositioning bone fragments due to high mobility and complexity, leading to potential malunion, pain, and arthrosis, especially when fragments are disjoint or multiple fragments need to be aligned.
Innovation Solution
A patient-specific registration instrument is designed with inverse contact surfaces that align with pathological and non-pathological surface portions of the bone fragments, providing a unique fit and reducing degrees of freedom to ensure precise positioning, along with guiding channels for pilot holes and an osteosynthesis plate for fixation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional registration instruments are used for osteosynthesis, then the surgical procedure can be performed, but accurate positioning of bone fragments is difficult due to high mobility and complexity of fractures
Solution Approach 1:
The registration instrument is divided into multiple contact surfaces, each designed to match specific surface portions of the bone fragment. This segmentation allows the instrument to accommodate complex fracture geometries while maintaining precise positioning through the coordinated action of multiple specialized contact surfaces.
Solution Approach 2:
The registration instrument serves as an intermediary device that bridges the gap between the surgeon and the bone fragment positioning. By incorporating multiple contact surfaces that match the fragment's geometry, it mediates the positioning process and enables accurate alignment without requiring the surgeon to directly manipulate the mobile fragments.
2Measurement precision
If the registration instrument has multiple contact surfaces to match complex fragment geometry, then positioning precision is improved, but the instrument design and manufacturing become more complex
Solution Approach 1:
The contact surfaces of the registration instrument are designed in advance to precisely match the specific geometry of the bone fragment's surface portions. This preliminary design phase, which may involve imaging and modeling, allows the complex geometry to be captured and replicated in the instrument, simplifying the actual manufacturing process by providing clear design specifications.
3Reliability
If conventional methods are used for repositioning fragments, then the procedure can be completed, but the risk of malunion increases due to fragment mobility
Solution Approach 1:
The registration instrument's contact surfaces are designed to self-align with the bone fragment's surface portions through geometric matching. This self-aligning mechanism reduces the need for complex manual manipulation and adjustment by the surgeon, thereby improving both the reliability of positioning and the efficiency of the surgical procedure.
Data Source
AI summary
The invention relates to a method for designing a patient-specific registration instrument for use in osteotomies and a surgical tool system comprising a registration instrument and an osteosynthesis plate.