Bone Registration via Projected Point Guidance
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Solution Overview
Problem
Current bone registration methods in computer-assisted orthopedic surgery are tedious, time-consuming, and prone to eye strain due to the need for manual point collection on bones, often obscured by tissues and fluids, leading to potential inaccuracies.
Innovation Solution
A handheld projection device that projects points onto the bone to guide the user in refining registration, allowing for more efficient and accurate point collection by eliminating the need for constant reference to a display monitor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If manual point collection is performed by constantly moving eyes between the monitor and the bone, then registration can be completed, but the process becomes time-consuming and tedious
Solution Approach 1:
A display monitor serves as an intermediary between the bone and the user, visually mapping registration points from the 3D bone model onto the actual bone surface. This allows the user to identify point locations on the monitor while maintaining visual contact with the bone, eliminating the need to constantly shift gaze between separate displays and the surgical site.
Solution Approach 2:
The system creates a visual copy of the registration points by projecting them onto the bone surface through the display monitor. This optical copy allows the user to see exactly where to place the probe without mentally mapping coordinates from a separate 3D model view, significantly reducing the time and cognitive load required for accurate point collection.
2Measurement precision
If manual point collection is performed with frequent monitor reference, then registration can be completed, but eye strain increases
Solution Approach 1:
The display monitor acts as a visual intermediary that superimposes registration point information directly onto or adjacent to the bone view, allowing the user to maintain continuous visual focus on the surgical site while obtaining precise point location guidance, thereby eliminating the harmful effect of repeated eye movements and strain.
3Ease of operation
If the bone is minimally exposed and covered by biological fluids and tissues, then surgical access is maintained, but point identification becomes difficult
Solution Approach 1:
The display monitor serves as a visual intermediary that overcomes the obscuring effect of biological fluids and tissues by providing a clear, enhanced visual representation of where registration points should be located on the bone, allowing the user to accurately identify points even when the bone surface is not clearly visible.
Solution Approach 2:
The system utilizes visual differentiation through color or intensity variations on the display monitor to highlight registration point locations, making it easier for the user to distinguish target points from surrounding anatomical structures even when the actual bone surface is obscured by tissues and fluids.
4Measurement precision
If high-level hand-eye coordination is required for manual point collection, then registration accuracy can be achieved, but the complexity of operation increases
Solution Approach 1:
The display monitor intermediary provides direct visual guidance of registration point locations overlaid on or adjacent to the bone view, eliminating the complex hand-eye coordination task of mentally mapping points from a separate 3D model to the actual bone, thereby maintaining accuracy while dramatically simplifying the operational task.
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 method significantly reduces the time and effort required for bone registration, enhances accuracy by projecting points directly onto the bone, and minimizes eye strain, leading to improved registration precision and efficiency in computer-assisted surgical procedures.
Implementation Method 1
a light emitter that projects the one or more points on the patient's bone
Data Source
AI summary
A system, device, and method is provided that improves the point collection process during bone registration for computer-assisted surgical procedures. A user is guided in the point collection process by projecting a set of points directly on the bone with a tracked digitizer probe following a rough registration of the bone. The system, device, and method therefore negates the need for the user to constantly look-up on an instructional display monitor and make the complicated mappings between the displayed instructions on the monitor and the actual bone.