Osteotomy Calibration Device for Robotic Knee Surgery
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Solution Overview
Problem
Existing robot-assisted surgery systems face challenges in accurately calibrating and tracking the osteotomy plane during knee arthroplasty, leading to potential errors between the planned and actual osteotomy positions due to the absolute positioning accuracy of the robotic arm and saw blade movement.
Innovation Solution
An osteotomy calibration method and device that utilize a position tracking unit and acquisition unit to determine the calculated position of the osteotomy plane, compare it to a predetermined position, and transmit relocation information to the robotic arm if the error exceeds a preset value, allowing for real-time correction and improved accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If robot-assisted surgery system uses absolute positioning accuracy of robotic arm for osteotomy, then automation is improved, but manufacturing precision deteriorates
Solution Approach 1:
The patent implements a feedback mechanism by using a position tracking calibration tool to continuously monitor the actual position of the osteotomy plane during surgery. The system compares the actual position with the planned position and provides real-time feedback to the control device, which then adjusts the robotic arm positioning to correct any deviations, thereby maintaining high precision despite automation
Solution Approach 2:
The patent replaces reliance on the robotic arm's mechanical absolute positioning system with an optical tracking system. The position tracking calibration tool uses optical markers and a navigation device to determine the actual osteotomy plane position, substituting the mechanical positioning accuracy with an optical measurement system that provides more accurate real-time position data
2Device complexity
If robot-assisted surgery system does not track and calibrate osteotomy surface during osteotomy, then device complexity is reduced, but measurement precision deteriorates
Solution Approach 1:
The patent introduces a position tracking calibration tool as an intermediary between the robotic arm and the osteotomy plane. This calibration tool includes optical markers that can be tracked by the navigation device, serving as a mediator to measure and report the actual position of the osteotomy plane without requiring direct integration into the robotic arm structure
Solution Approach 2:
The position tracking calibration tool serves multiple functions: it acts as a positioning reference for the navigation device, provides real-time feedback on osteotomy plane position, and enables calibration of the robotic arm positioning. This multi-functional tool achieves high measurement precision without significantly increasing overall system complexity
3Ease of operation
If saw blade swings perpendicular to saw blade during osteotomy, then ease of operation is improved, but manufacturing precision deteriorates
Solution Approach 1:
The system provides real-time feedback on the actual position of the osteotomy plane created by the saw blade. The position tracking calibration tool monitors the saw blade position and the resulting osteotomy plane, allowing the control device to detect deviations caused by saw blade swing and compensate for them through feedback control
Data Source
AI summary
An osteotomy calibration method, calibration device, and an orthopedic surgery system are provided by present application. Firstly using the osteotomy calibration device 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.