Wedge Osteotomy Device Angular Alignment
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Solution Overview
Problem
Current wedge osteotomy procedures face challenges in accurately performing closing wedge osteotomies, particularly in ensuring the precision of bone cuts and alignment, which can lead to undesirable limb shortening and misalignment.
Innovation Solution
A wedge osteotomy device comprising a cutting guide and a base plate pivotally connected via a joint, with a cutting slot and arcuate slot for precise angular orientation, and a thumb-screw for securing the cutting guide, allowing for accurate wedge resection and alignment during surgical procedures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a closing wedge osteotomy is performed with manual bone cuts, then the surgical procedure can be completed, but the precision of bone cuts and alignment is compromised leading to undesirable limb shortening and misalignment
Solution Approach 1:
The cutting guide is pre-configured with the desired wedge angle and orientation before the surgical procedure. The arcuate slot with angular markers allows the guide to be positioned and locked at the precise pre-calculated angle relative to the first bone cut, ensuring that the second cut will create the exact desired wedge geometry without requiring complex intraoperative adjustments
Solution Approach 2:
The cutting guide serves as an intermediary device between the surgeon's planning and the actual bone cutting. It translates the pre-operative plan into precise physical cuts by providing a mechanical reference frame with arcuate slots and angular markers that guide the saw blade at the correct angle and position, eliminating the need for complex manual measurement and alignment during surgery
2Measurement precision
If the wedge angle is not accurately controlled during closing wedge osteotomy, then the surgical procedure can be completed quickly, but the accuracy of wedge resection is compromised leading to limb deformity
Solution Approach 1:
The cutting guide incorporates visual feedback through angular markers displayed on the arcuate slot that indicate the precise angle of the second cut relative to the first cut. This allows the surgeon to verify the wedge angle is correct before making the cut, ensuring measurement precision without requiring time-consuming trial adjustments or complex measurement procedures during surgery
3Stability of the object's composition
If the two osteotomies are not parallel after wedge removal, then the procedure can be completed, but the axes shift in non-corrected planes causing misalignment
Solution Approach 1:
The cutting guide uses an asymmetric arcuate slot design where the curvature and angular markers are specifically configured to maintain parallelism between the first and second osteotomies. The arcuate geometry ensures that as the guide is rotated to different wedge angles, the cutting slot remains oriented perpendicular to the bone axis, automatically preserving parallelism without requiring the surgeon to manually adjust or calculate the orientation
Data Source
AI summary
A wedge osteotomy device including a cutting guide coupled to a base plate via a joint. The cutting guide configured to pivot relative to the base plate about a pivot axis extending through the joint. The cutting guide including a guide body including a cutting slot extending through the guide body, an arcuate slot extending through the guide body and defining a radius to the joint, and a plurality of markers on the guide body identifying a position of the cutting guide relative to the base plate. The base plate including planar top and bottom surfaces.