Osteotomy Calibration Method for Robotic Knee Surgery
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing robot-assisted surgery systems face challenges in accurately calibrating and tracking the osteotomy surface during knee arthroplasty, leading to inaccuracies due to the absolute positioning accuracy of the robotic arm and saw blade deviations, which can result in errors between planned and actual osteotomy positions.
Innovation Solution
An osteotomy calibration method that calculates the position information of a detection plane on the current osteotomy plane, determines position errors relative to a planned plane, and transmits relocation information to the robotic arm to correct its position, using a plane calibration tool with trackable elements and sensors to enhance accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If robot-assisted surgery system is used for osteotomy positioning, then automation and consistency are improved, but absolute positioning accuracy limitations and inability to track osteotomy surface reduce measurement precision
Solution Approach 1:
The patent implements real-time feedback by placing a tracking marker on the osteotomy surface and continuously monitoring its position during surgery. The system compares the actual osteotomy surface position with the preoperative plan, providing real-time feedback to guide the robotic arm for precise adjustments and corrections.
Solution Approach 2:
The patent performs preliminary actions by creating a detailed preoperative plan including the desired osteotomy surface position and orientation. Tracking markers are pre-positioned on the bone, and the robotic system is pre-calibrated with patient-specific anatomy data before the actual osteotomy begins.
2Ease of operation
If robotic arm controls osteotomy tool movement, then ease of operation is improved, but saw blade swing perpendicular to blade direction causes positioning errors
Solution Approach 1:
The patent replaces pure mechanical control with a hybrid system combining robotic mechanics and optical tracking. Instead of relying solely on robotic arm precision, the system uses optical markers and vision systems to detect and compensate for saw blade deviations in real-time, substituting mechanical precision requirements with optical measurement and software compensation.
3Reliability
If multiple positioners and navigation devices are used, then reliability of osteotomy positioning is improved, but device complexity increases
Solution Approach 1:
The patent merges multiple functions into a unified system where the robotic arm integrates both positioning and navigation capabilities. The tracking marker system combines anatomical registration, real-time position monitoring, and orientation detection into a single integrated approach, eliminating the need for separate positioners and navigation devices.
Data Source
AI summary
An osteotomy calibration method, calibration tools, a readable storage medium, and an orthopedic surgery system are provided. Firstly using the plane calibration tool to obtain the calculated position information of the current osteotomy plane, and then determining a position error between the calculated position information and a predetermined position information of a planned osteotomy plane, and if the position error exceeds a preset value, calculating and transmitting a relocation information to a robotic arm to control and relocate the robotic arm. By comparing and identifying the position error between the current osteotomy plane formed by the first osteotomy and the planned predetermined osteotomy plane, relocating the robotic arm, and performing a secondary correction of the osteotomy plane. In addition, by relocating the robotic arm and secondary correction of the osteotomy plane, additional bone nails which is to fix the navigation tool to the bone can be avoided.