Patient-Specific Osteotomy Guide with Elastic Tabs
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Solution Overview
Problem
Current osteotomy techniques lack effective means for precise and reliable operator assistance during the opening osteotomy procedure, relying heavily on experience and empiricism, which can lead to deviations from preoperative planning.
Innovation Solution
A surgical guiding device specifically designed for each patient, utilizing CT imaging and three-dimensional reconstruction to simulate the osteotomy, with custom-manufactured patient-specific instruments that include elastic tabs and tubular conduits for precise positioning and cutting line guidance, aiding in the accurate placement of osteosynthesis plates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional osteotomy techniques are used without specialized guiding devices, then the surgical procedure can be performed with basic tools, but the precision and reliability of following preoperative planning is compromised
Solution Approach 1:
The surgical guide device is divided into multiple functional components: a positioning component with elastic tabs for bone contact, a guide component with through-holes for cutting line and screw placement, and a fixation component. This segmentation allows each part to perform its specific function while maintaining overall precision without excessive complexity.
Solution Approach 2:
The device is designed based on preoperative planning and 3D reconstruction, with all through-holes and guide features pre-configured according to the planned osteotomy. This preliminary preparation ensures that during surgery, the cutting line and screw placements automatically follow the preoperative plan without requiring real-time complex decisions.
2Measurement precision
If operator experience and empiricism are relied upon for preoperative planning, then the surgical procedure can be performed with standard tools, but the accuracy of determining spatial correction values is reduced
Solution Approach 1:
The device creates a physical copy of the patient's bone anatomy through 3D reconstruction from CT imaging. This digital twin allows precise simulation of the osteotomy and preoperative planning without requiring the operator to mentally visualize complex spatial relationships, making the planning process more accurate and easier to execute.
Solution Approach 2:
The surgical guide device acts as an intermediary between the preoperative planning and the actual surgery. It translates the planned correction values into physical guide features (through-holes, guide windows) that automatically ensure accurate cutting line and screw placement, eliminating the need for the operator to rely solely on experience.
3Reliability
If standard surgical tools are used without patient-specific instruments, then the surgical procedure is simpler and faster to implement, but the reliability of following preoperative planning is compromised
Solution Approach 1:
The surgical guide device is manufactured in advance based on preoperative planning, with all guide features pre-configured. This preliminary preparation ensures that during surgery, the cutting line and screw placements automatically follow the plan without requiring real-time complex decisions or adjustments, thereby ensuring reliability.
Solution Approach 2:
The device is customized for each patient based on their specific anatomy and surgical plan, with parameters such as through-hole positions, guide window orientations, and tab configurations adjusted to match the individual case. This customization ensures maximum reliability while the manufacturing time is offset by the benefits of precision.
4Measurement precision
If elastic tabs are added to the surgical guide device for bone surface contact, then the positioning accuracy is improved, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The elastic tabs are designed with specific material properties and geometric parameters that allow them to be manufactured as integral parts of the surgical guide. By adjusting parameters such as material elasticity, tab thickness, and contact surface area, the device achieves accurate positioning without requiring complex assembly processes.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The device enables surgeons to perform osteotomies with increased precision and safety by accurately following preoperative plans, ensuring correct screw placement and cutting line orientation, thereby enhancing the success of the procedure.
Implementation Method 1
which comprises at least one tab adapted to be positioned against a surface of said bone, which tab has an elastic deformation capacity
Data Source
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AI summary
The invention relates to a surgical guide device (1) intended to be attached to a bone of a patient for assisting an open wedge osteotomy. This surgical guide device (1) comprises two parts (4, 5) which are joined together by means of removable securing means, namely: - a proximal part (4), comprising a lower border (413) defining at least one portion of the upper edge (21) of a guide window (2), - and a distal part (5) having an upper edge (54) defining at least one portion of the lower edge (22) of the guide window (2). The proximal (4) and distal (5) parts are each provided with a plurality of through holes (42, 56) adapted for receiving members temporarily implantable in said bone (S) and/or adapted to guide a drilling of holes in said bone (S). The arrangement of the through holes (42, 56) of the surgical guide device (1) advantageously takes into account the planned open wedge osteotomy and anticipates the final position of the screw locations of the reported osteosynthesis plate for freezing the two bone fragments.