Mixed Reality Bone Graft Shaping With Planned Surface Overlay
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Solution Overview
Problem
Shaping bone grafts to fit complex and irregular patient anatomy is challenging under time pressure in orthopedic surgeries, especially when the correct shape is required for stable contact between the patient's natural bone and the graft.
Innovation Solution
A mixed reality (MR) system is used to guide bone graft shaping by overlaying a virtual object on a bone support member, which includes a reference marker, allowing precise alignment and cutting based on a planned surface, enhancing accuracy and speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional manual shaping methods are used for bone grafts, then the surgeon has flexibility in adaptation, but the shaping precision and speed are insufficient under time pressure
Solution Approach 1:
The surgical plan is created preoperatively with the desired bone graft shape defined, and the virtual model is prepared in advance. During surgery, the pre-planned virtual guidance is simply overlaid on the actual bone, eliminating the need for complex intraoperative calculations and enabling rapid, precise shaping.
Solution Approach 2:
A virtual copy of the patient's bone anatomy is created from preoperative imaging data. This virtual model is then used to generate guidance overlays that are projected onto the actual bone during surgery, allowing the surgeon to see the desired shape superimposed on the real anatomy for precise replication.
2Manufacturing precision
If complex virtual reality systems are used for guidance, then the shaping accuracy improves, but the device complexity and ease of operation deteriorate
Solution Approach 1:
A camera captures images of the actual bone and the surgical site, then the system processes these images to generate and display virtual guidance overlays. This intermediary imaging approach simplifies the system compared to complex haptic or robotic systems while maintaining high guidance accuracy through visual feedback.
Solution Approach 2:
The patent replaces complex mechanical guidance systems with a computational imaging and display system. Instead of using mechanical fixtures, guides, or robotic arms, the system uses software-based virtual overlays projected onto the bone, reducing mechanical complexity while improving precision.
3Manufacturing precision
If detailed preoperative planning is performed, then the bone graft fit improves, but the surgical time increases
Solution Approach 1:
The detailed planning is completed preoperatively using imaging data to create a virtual model and define the optimal bone graft shape. During surgery, only the simple task of overlaying the pre-computed virtual guidance remains, minimizing intraoperative time while maintaining high precision.
Solution Approach 2:
The preoperative planning creates a virtual copy of the target anatomy with the ideal bone graft shape. This virtual template is then rapidly applied during surgery through image overlay, allowing the surgeon to follow the pre-planned design without repeating complex planning steps in the operating room.
Data Source
AI summary
Techniques and systems are described for mixed reality bone graft cutting. A method comprises, receiving tracking input of a scene in which a target bone is positioned on a bone support member of a platform, wherein the platform that comprises a reference marker; generating registration data that registers the reference marker with a coordinate system; obtaining data defining a planned surface of die target bone; determining, based on the registration data, a position in the coordinate system for a virtual object representing the planned surface of the target bone; and while the target bone is positioned on the bone support member of the platform, causing a mixed reality (MR) visualization device to output the virtual object for display so that the virtual object appears to a user of the MR visualization device to pass through the target bone and indicates the planned surface of the target bone.