Hinged Bone Plate Registration for Robotic Knee Revision
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Solution Overview
Problem
Conventional robotic joint replacement procedures lack precision and accuracy due to the inability of tracking devices to accommodate bones of various sizes, and standard pins can interfere with surgical operations such as reaming.
Innovation Solution
A specialized bone plate with a hinge mechanism that can be adjusted to fit bones of different sizes, secured using fasteners to minimize interference with reaming operations, and equipped with a registration marker for accurate optical navigation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If standard pins are used for tracking devices, then the procedure is simple, but the pins interfere with surgical operations such as reaming
Solution Approach 1:
The tracking device is extracted from the intramedullary canal location where it would interfere with reaming operations. Instead, the bone plate is positioned on the external surface of the bone, separating the tracking function from the surgical pathway and eliminating interference while maintaining tracking capability.
Solution Approach 2:
A bone plate serves as an intermediary structure that carries the tracking device away from the surgical workspace. The bone plate acts as a mediator between the tracking requirement and the surgical operation, allowing both to coexist without interference by positioning the tracker on the plate rather than inside the canal.
2Device complexity
If conventional tracking devices are used, then the device structure is simple, but the devices cannot accommodate bones of various sizes
Solution Approach 1:
The bone plate incorporates a hinge mechanism that allows dynamic adjustment of the tracking device position and orientation. This enables the device to adapt to bones of various sizes and anatomical variations while maintaining a relatively simple overall structure. The hinge provides flexibility without requiring multiple complex custom devices.
Solution Approach 2:
The bone plate with hinge mechanism creates a universal tracking device that can accommodate multiple bone sizes and anatomical configurations. Rather than requiring different tracking devices for different patient anatomies, this single design with adjustment capability serves multiple functions across various bone sizes.
3Strength
If the bone plate is secured with fasteners close to the reaming area, then the attachment is strong, but the fasteners interfere with reaming operations
Solution Approach 1:
The bone plate design segments the attachment function from the reaming pathway by positioning fasteners at locations that provide strong attachment while clear of the reaming trajectory. Multiple fasteners are distributed across the bone plate surface, allowing strong fixation without placing any single fastener in the interference zone.
Data Source
AI summary
A device for registering a bone for a robotic knee arthroplasty with a surgical robot can include a plate and a registration device. The plate can be engageable with the bone and can include a lateral portion, a medial portion, and a hinge. The registration device can be connected to the plate and can be configured to interface with the surgical robot for registration of the plate and the bone.