Spherical Osteotomy Device for 3D Bone Correction
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Solution Overview
Problem
Conventional osteotomy methods, such as barrel-vault osteotomies, are limited in correcting axial rotational deformities and require meticulous pre-operative planning, often resulting in instability and incomplete correction due to two-dimensional repositioning limitations, and lack a method for achieving true spherical osteotomies.
Innovation Solution
A method and device for performing true dome or spherical osteotomies using a spherical osteotomy device that allows for three-dimensional adjustability, maximizing bone-to-bone surface contact and stability, involving pre-surgical 3D analysis and planning with CT or MRI scans, and a self-guiding osteotomy device for precise sectioning and realignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional barrel-vault osteotomy methods are used, then the procedure is simpler to perform, but the ability to correct axial rotational deformities is limited and stability is reduced
Solution Approach 1:
The patent transitions from two-dimensional barrel-vault osteotomy to three-dimensional spherical osteotomy. The spherical cutting surface allows correction in all three spatial dimensions (frontal plane, sagittal plane, and axial rotation), enabling comprehensive deformity correction that was impossible with conventional methods. The spherical geometry provides rotational freedom around multiple axes simultaneously.
Solution Approach 2:
The patent employs a spherical cutting surface instead of the conventional cylindrical barrel-vault shape. This spherical geometry, defined by a center of rotation and angulation (CORA), allows the osteotomy to accommodate and correct deformities in multiple planes and directions, providing true three-dimensional adjustability and maximizing bone-to-bone surface contact.
2Manufacturing precision
If meticulous pre-operative planning is performed with conventional methods, then some alignment correction is achieved, but incomplete correction and instability remain due to two-dimensional repositioning limitations
Solution Approach 1:
The spherical osteotomy device adds a third dimension to bone realignment capability. While conventional barrel-vault osteotomy allows repositioning in two dimensions (frontal and sagittal planes), the spherical geometry enables simultaneous correction in all three dimensions including axial rotation, achieving complete deformity correction and stable realignment.
Solution Approach 2:
The spherical cutting surface creates a ball-and-socket type articulation between bone segments, allowing multi-axial rotation and adjustment. This spherical geometry provides inherent stability through maximum surface contact while enabling precise three-dimensional positioning that conventional cylindrical methods cannot achieve.
3Productivity
If conventional osteotomy methods are used, then the procedure is faster to perform, but bone loss increases and healing is slower
Solution Approach 1:
The spherical osteotomy creates interlocking dome-shaped surfaces with maximum contact area between bone segments. This geometry distributes mechanical loads evenly across the interface, reduces stress concentration, and promotes uniform healing. The spherical shape also minimizes bone removal compared to conventional methods while achieving stable realignment.
Data Source
AI summary
A pre-surgical planning method for performing a spherical osteotomy for the surgical sectioning of a bone includes obtaining a CT scan of a bone. Subsequently manipulating the scan into a three-dimensional CAD format. Utilizing the scan to identify one or more centers of bone correction or 3D CORAs. A surface, configured in the shape of a portion of a sphere, e.g., a semisphere, is then superimposed on the computer representation of the bone. The center of the surface is positioned at a respective center of bone correction. The intersection of the surface and the bone defines a sectioning surface along which the bone is to be cut. Simulating a sectioning of the bone along the sectioning surface and the subsequent realignment of the bone in an optimal configuration using the computer is then performed. The computer simulation is then utilized as a guide for actually sectioning the bone.