Depth Camera PSI Positioning for Surgical Accuracy
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Solution Overview
Problem
Current computer-assisted surgical techniques using Patient Specific Instrumentation (PSI) face challenges in accurately determining the intraoperative position and orientation of PSI during surgical procedures, due to limitations in visualizing osteophytes and cartilage, which can lead to inaccuracies in implantation and subsequent surgical gestures.
Innovation Solution
A computer device utilizing a 3D camera to capture depth maps of the surgical scene, which determines the appropriate positioning of PSI by comparing planned and actual positions of the instrumentation and target bone area, providing real-time feedback to the surgeon to ensure accurate placement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional optical cameras with markers are used for computer-assisted surgery, then real-time localization accuracy is improved, but surgical time and costs increase due to additional marker placement steps
Solution Approach 1:
The patent extracts and eliminates the marker placement step from the surgical workflow. By using a depth camera to directly capture the bone surface geometry and automatically generate PSI positioning information, the system removes the need for time-consuming manual marker attachment while maintaining localization accuracy.
Solution Approach 2:
The system enables the bone structure itself to serve as the localization target. The depth camera captures the bone surface geometry directly, and the PSI positioning is automatically determined from this captured geometry, allowing the bone to 'self-serve' as the reference without requiring external markers.
2Productivity
If CT images are used for preoperative planning of PSI, then planning efficiency is improved, but visualization accuracy of osteophytes and cartilage deteriorates
Solution Approach 1:
The patent merges the advantages of both CT-based planning and intraoperative depth camera capture. The system uses CT images for efficient preoperative planning and then combines this with intraoperative depth camera data to capture the actual bone surface geometry including osteophytes and cartilage, creating a comprehensive positioning solution that leverages both modalities.
Solution Approach 2:
The system performs preliminary planning using CT images to establish the intended PSI positioning, then uses intraoperative depth camera capture to verify and adjust this positioning based on the actual bone surface geometry. This preliminary action followed by verification ensures both efficiency and accuracy.
3Loss of time
If PSI is designed based on preoperative images only, then design time is reduced, but implantation accuracy deteriorates due to inability to account for osteophytes and cartilage
Solution Approach 1:
The system performs preliminary PSI design based on preoperative images to establish the basic positioning, then uses intraoperative depth camera capture to verify and refine this positioning against the actual bone surface. This two-stage approach allows efficient design followed by accurate verification.
Solution Approach 2:
The system implements feedback by comparing the preoperatively designed PSI positioning with the actual bone surface geometry captured by the depth camera during surgery. This feedback loop allows for verification and adjustment of the PSI positioning to ensure accurate implantation despite variations in bone surface features.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution enables accurate and efficient placement of PSI, reducing surgical time and costs by eliminating the need for additional markers on the bone, while improving the precision of surgical procedures.
Implementation Method 1
receiving from a 3D camera a depth map of a captured scene comprising at least said target bone area and said instrumentation
Data Source
AI summary
Computer device (33) for determining an appropriate positioning of an instrumentation on a target bone area (200) according to a relative positioning (42) of said instrumentation to said target bone area defined by a surgical planning (32), said device comprising—an interface for receiving from a 3D camera (31) a depth map (41) of a captured scene (310) comprising at least said target bone area; —computing means for determining a position element of said target bone area from said depth map; determining a second positioned shape (442) of said target bone area according to said relative positioning (42), and determining data (43) representative of said appropriate positioning on the base of said second positioned shape (442) and said position element; —a human-machine interface for providing said data.