Rotatable Guide Tower for Tibial Offset Alignment
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Solution Overview
Problem
In revision knee surgeries, accurately positioning and securing orthopaedic instruments on the tibia to align prosthetic components with the natural anatomy is challenging due to variations in patient anatomy and the need for precise offset orientations, which can affect the fit and stability of the prosthetic joint.
Innovation Solution
The method involves using a guide tower and offset tool to position a stem trial and reamer within the tibia's medullary canal, adjusting the guide tower's orientation, and securing a tibial base trial to achieve the desired offset, allowing for precise alignment and preparation of the tibia for prosthetic implantation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional surgical instruments are used without offset adjustment capability, then the surgical procedure is simpler, but the precision of prosthetic component alignment and offset orientation cannot be achieved
Solution Approach 1:
The guide tower is made rotatable relative to the stem trial, allowing dynamic adjustment of the guide tower's orientation. This rotational capability enables the surgeon to achieve precise offset orientations (e.g., 0°, 15°, 30°) by rotating the guide tower to the desired angle, thereby resolving the contradiction between achieving high alignment precision and maintaining instrument simplicity.
Solution Approach 2:
The offset setting mechanism is divided into separate functional components: the guide tower, the stem trial, and the rotatable connection between them. This segmentation allows each component to perform its specific function independently while collectively achieving the complex alignment task, making the system more manageable and precise.
2Adaptability or versatility
If multiple offset orientations are supported, then adaptability to different patient anatomies improves, but the complexity of positioning and securing instruments increases
Solution Approach 1:
The rotatable guide tower provides dynamic adaptability by allowing real-time adjustment to different offset orientations during the surgical procedure. The surgeon can rotate the guide tower to match the specific anatomical requirements of each patient, supporting multiple offset orientations (0°, 15°, 30°) without requiring multiple separate instruments, thus maintaining ease of operation while improving versatility.
Solution Approach 2:
The guide tower serves multiple functions: it guides the reamer, supports the stem trial, and provides rotatable offset adjustment. This multi-functionality allows a single instrument assembly to handle various surgical scenarios with different patient anatomies, improving adaptability without proportionally increasing operational complexity.
3Reliability
If the guide tower is secured firmly to ensure stability, then the reliability of the surgical setup improves, but the ability to rotate and adjust offset orientation is reduced
Solution Approach 1:
The system is segmented into a base component (stem trial) and a rotatable component (guide tower). The stem trial is secured firmly in the medullary canal to provide stable support, while the guide tower is connected via a rotatable interface that allows adjustment. This segmentation resolves the contradiction by assigning stability to the base component and adjustability to the rotatable component, allowing both requirements to be satisfied simultaneously.
Data Source
AI summary
An orthopaedic surgical instrument assembly is disclosed. The orthopaedic surgical assembly includes a guide tower, an offset tool attached to the guide tower, and a stem trial. A guide tower includes a base surface adapted to be positioned on a proximal end of a patient's tibia and defining a first axis extending through the base surface. The offset tool is configured to rotate about the first axis. The offset tool includes a tool body that is positioned in the guide tower and is integrally formed with a shaft extending through an opening defined in the base surface of the guide tower. The stem trial is removably coupled to a lower end of the shaft.