Tibial Impaction Guide Cup With Stepped Surfaces
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Solution Overview
Problem
During revision knee replacement surgeries, existing orthopaedic instruments lack efficient methods for accurately aligning and securing the tibial tray within the intramedullary canal of the tibia, leading to challenges in ensuring proper fixation and alignment of prosthetic components.
Innovation Solution
An orthopaedic surgical instrument featuring a cup with stepped surfaces and a slot system that aligns with the keel of the tibial tray, combined with an impaction guide and alignment rod, allows for precise alignment and secure fixation of the tibial tray within the intramedullary canal, facilitating the insertion and positioning of the prosthetic component.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional orthopaedic instruments are used during revision knee replacement surgery, then the surgical procedure can be performed, but accurate alignment and secure fixation of the tibial tray within the intramedullary canal cannot be achieved
Solution Approach 1:
The instrument is divided into distinct functional segments: a cup portion with stepped surfaces for receiving different tibial tray sizes, a collar portion for attachment to the impactor, and a slot system for alignment. This segmentation allows each component to perform its specific function optimally while maintaining overall alignment precision.
Solution Approach 2:
The instrument incorporates pre-configured alignment features including slots that extend through the cup and collar, and stepped surfaces that are prepared in advance to match specific tibial tray dimensions. These preliminary configurations enable accurate alignment to be achieved without requiring complex adjustment procedures during surgery.
2Reliability
If existing surgical instruments are used, then the procedure can be completed, but proper positioning and stability of the prosthetic component cannot be ensured
Solution Approach 1:
The instrument design allows the tibial tray to self-align within the cup through the stepped surfaces that match specific tray sizes and shapes. The slot system automatically guides the keel of the tibial tray into proper positioning, eliminating the need for complex manual alignment procedures by the surgeon.
Solution Approach 2:
The cup and collar structure serves as an intermediary device between the impactor and the tibial tray. It provides a stable interface that ensures proper positioning during impaction while maintaining ease of operation through simple attachment and detachment mechanisms.
3Manufacturing precision
If traditional alignment methods are used, then the surgery can proceed, but accurate alignment of the tibial tray keel with the intramedullary canal slot cannot be achieved
Solution Approach 1:
The slot system is designed with asymmetric features including slots positioned at specific orientations to match the asymmetric geometry of the tibial tray keel and intramedullary canal. This asymmetric design ensures unique and accurate alignment without requiring complex adjustable mechanisms.
Solution Approach 2:
The alignment mechanism employs a nested structure where the slot system is integrated within the cup and collar assembly. The slots extend through multiple components, creating a nested alignment pathway that guides the tibial tray keel through predetermined trajectories to achieve accurate positioning.
Data Source
AI summary
An orthopaedic surgical instrument includes a cup including an outer surface having an opening positioned on a component-engaging side and an inner wall extending from the opening of the outer surface to a back wall. The inner wall having a plurality of stepped surfaces facing the component-engaging side. Each of the plurality of stepped surfaces is sized to receive a platform of a tibial tray.