Navigated Shoulder Arthroplasty Registration Assembly
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Solution Overview
Problem
Conventional joint arthroplasty procedures lack precision and often require standard pins that can interfere with surgical operations, particularly in robotic-assisted surgeries, where accommodating bones of various sizes and avoiding interference during reaming and implantation are challenges.
Innovation Solution
A registration assembly for robotic surgical systems that includes a bone plate with bone spikes and a surgical cable for secure fixation to bones, allowing for precise tracking and minimizing interference, featuring a locking device to limit penetration depth and a registration marker for optical navigation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If standard pins are used for bone fixation, then the procedure is simple, but they interfere with surgical operations during reaming and implantation
Solution Approach 1:
The patent extracts the registration marker from the bone pin structure, placing it on a separate plate that attaches to the bone surface. This removes the interfering element (pin) from the surgical field while maintaining fixation capability through the plate-cable-spike system, allowing unobstructed access during reaming and implantation operations.
Solution Approach 2:
The plate acts as an intermediary between the bone and the registration marker. Instead of directly attaching the marker to pins that would interfere with surgery, the plate provides a stable mounting surface for the marker while the cable-spikes system provides bone fixation without obstructing the surgical field.
2Adaptability or versatility
If conventional fixation methods are used, then the procedure is straightforward, but they cannot accommodate bones of various sizes effectively
Solution Approach 1:
The fixation system is made dynamic and adjustable through the cable-tensioning mechanism. The cable can be tensioned to different degrees and the spikes can be positioned at various locations, allowing the same plate design to adapt to bones of different sizes and shapes. This dynamic adjustability replaces the need for multiple fixed-size fixation devices.
Solution Approach 2:
The plate-cable-spike system serves multiple functions: it provides bone fixation, supports the registration marker, and can be adjusted to accommodate various bone geometries. This universal design replaces the need for different fixation devices for different bone sizes, making the system versatile across various anatomical variations.
3Measurement precision
If registration markers are securely attached to bones, then tracking precision is improved, but the attachment method may interfere with subsequent surgical operations
Solution Approach 1:
The system segments the registration marker from the bone-attachment mechanism. The marker is mounted on a plate that is separately fixed to the bone using cable and spikes. This segmentation allows the marker to be optimally positioned for tracking precision while the cable-spike system provides secure attachment without interfering with surgical operations in the bone region.
Data Source
AI summary
A device for registering a bone for a robotic shoulder arthroplasty with a surgical robot. The device can include a first portion engageable with a first portion of a bone and can include a second portion engageable with a second portion of the bone, the second portion connected to the first portion and rotatable with respect to the first portion. The device can include a registration device connectable to the first portion and configured to interface with the surgical robot for registration of the device and the bone. The device can include an actuator engageable with the first portion and the second portion to move the second portion toward a closed position away from an open position.