Tibial Trial Instruments Offset Guide
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Solution Overview
Problem
Current orthopaedic surgical instruments for revision knee surgeries lack efficient tools for accurately identifying and achieving the optimal offset orientation of prosthetic components, leading to suboptimal bone coverage and stability during joint replacement procedures.
Innovation Solution
The development of an orthopaedic surgical instrument system that includes an offset guide instrument assembly and stem trial, which utilize a guide tower and offset guide tool to identify and achieve the desired offset orientation of revision tibial and femoral prosthetic components, ensuring maximum bone coverage and stability by aligning anatomical landmarks and using locking mechanisms for precise component placement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional orthopaedic surgical instruments are used for revision knee surgeries, then the surgical procedure can be performed, but the offset orientation of prosthetic components cannot be accurately identified and achieved, resulting in suboptimal bone coverage and stability
Solution Approach 1:
The guide instrument is divided into multiple functional components: a guide tower with anatomical landmark indicators, an offset guide tool with adjustable positioning mechanisms, and a locking mechanism. This segmentation allows each component to perform its specific function independently while contributing to the overall precision of offset orientation identification and achievement.
Solution Approach 2:
The offset guide tool acts as an intermediary instrument that transfers the anatomical landmark information from the guide tower to the prosthetic component positioning system. It mediates between the anatomical reference points and the final component placement, ensuring accurate offset orientation through its adjustable arms and locking mechanism.
2Measurement precision
If a comprehensive guide instrument system with multiple components is used to achieve precise offset orientation, then measurement precision improves, but device complexity increases
Solution Approach 1:
The guide tower serves multiple functions: it provides anatomical landmark reference points, establishes the mechanical axis of the tibia, and guides the positioning of the offset guide tool. This multi-functionality reduces the need for separate instruments, thereby managing device complexity while maintaining measurement precision.
Solution Approach 2:
The guide instrument system is designed to establish a common reference framework (equipotential surface) based on anatomical landmarks. By creating this unified reference system, all subsequent measurements and component placements are made relative to the same baseline, simplifying the overall process despite the presence of multiple components.
3Manufacturing precision
If adjustable offset guide tools with locking mechanisms are used, then component placement precision improves, but ease of operation decreases
Solution Approach 1:
The offset guide tool is pre-configured with adjustable arms and locking mechanisms that are designed to be set before the actual component placement. The surgeon adjusts the arms to match the desired offset orientation and locks them in place before inserting the prosthetic component, ensuring precision without complicating the final placement step.
Solution Approach 2:
The guide instrument system appears to be designed as a disposable or single-use tooling system. This approach allows for complex adjustment and locking mechanisms to be incorporated without concern for long-term durability or sterilization, maintaining ease of operation during the surgical procedure while achieving high placement accuracy.
Data Source
Figure 1
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AI summary
An orthopaedic surgical instrument assembly includes a tibial base trial (182) adapted to be positioned on a surgically-prepared proximal end of a patient's tibia, a base fastener (242), and a stem adaptor (184) secured to the base fastener. The stem adaptor includes a first adaptor body (260) engaged with a lower surface (194) of the tibial base trial and a second adaptor body (262) pivotally coupled to the first adaptor body. A stem trial (14) is removably coupled to the second adaptor body of the stem adaptor.