Anti-Rotation Base for Orthopedic Registration Marker
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Solution Overview
Problem
Surgical joint repair procedures face challenges in accurately positioning prosthetics due to the difficulty in selecting appropriately sized and shaped implants and ensuring optimal positioning during orthopedic surgeries, despite the use of virtual visualization tools for preoperative planning.
Innovation Solution
The implementation of a mixed reality (MR)-based visualization system that uses a registration marker with an anti-rotation base to align virtual objects with their physical counterparts, providing a transformation matrix for precise alignment and orientation of prosthetic components during joint repair surgeries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If virtual visualization tools are used for preoperative planning, then surgical planning accuracy is improved, but intraoperative positioning precision deteriorates
Solution Approach 1:
The patent creates a physical copy (registration marker) of the virtual surgical plan that can be tracked in real-time during surgery. The marker contains encoded surgical plan information and serves as a bridge between the virtual preoperative plan and the physical intraoperative environment, allowing the surgical team to reference and adjust the plan based on actual anatomical conditions.
Solution Approach 2:
The registration marker acts as an intermediary object that connects the virtual visualization tools with the physical surgical field. It enables real-time alignment and registration between the virtual surgical plan and the actual patient anatomy, facilitating precise positioning of implants and instruments during the procedure.
2Device complexity
If standard registration markers are used without anti-rotation features, then device complexity is reduced, but measurement precision deteriorates
Solution Approach 1:
The registration marker incorporates an asymmetric anti-rotation base with a unique geometric shape that prevents rotational movement. The base features a specific contour that matches a corresponding asymmetric feature on the bone surface or surgical guide, ensuring the marker can only be positioned in one specific orientation, thereby eliminating rotation errors while adding minimal structural complexity.
Solution Approach 2:
The patent adds a rotational constraint dimension to the registration marker by incorporating the anti-rotation base. This prevents movement in the rotational degree of freedom, transforming the marker from a two-dimensional planar element that can rotate freely to a three-dimensional structure with constrained orientation, thereby improving alignment accuracy without significantly increasing overall complexity.
Data Source
AI summary
Bone tracking during orthopedic surgical procedures is described herein. An anti-rotation base of a registration marker of a mixed reality surgery system includes a surface configured to rest on and bear against a surface of a glenoid of a patient. The anti-rotation base also includes a plurality of pin receptacles that each define a respective pin axis. The pin axis of a first pin receptacle of the plurality of pin receptacles is not parallel to the pin axis of a second pin receptacle of the plurality of pin receptacles. Additionally, the anti-rotation base includes a mounting receptacle configured to receive the registration marker.