Tibial Insert Trial Adaptor with Locking Tab for Orthopaedic Sizing
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Solution Overview
Problem
Current orthopaedic surgical instruments lack an efficient system for sizing and selecting tibial prosthetic components during joint arthroplasty procedures, particularly in revision surgeries, where multiple trials of different sizes are needed to ensure optimal fit and stability.
Innovation Solution
The development of an orthopaedic surgical instrument system that includes a tibial base trial with a post and insert adaptor, allowing for the secure positioning and rotation of a tibial insert trial, which can be easily swapped with different sizes to evaluate and select the appropriate tibial prosthesis, coupled with a femoral component that articulates over a range of motion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple trial components of different sizes are used to size and select prosthetic components, then the accuracy of component selection is improved, but the complexity of the trial system increases
Solution Approach 1:
The trial system is divided into separate modular components: a tibial base trial with a post, multiple tibial insert trials with different sizes, and a femoral trial. Each component can be independently selected and assembled, allowing precise sizing while maintaining manageable complexity through modularity.
Solution Approach 2:
The tibial base trial with its post serves as a universal interface that can accommodate multiple different sized tibial insert trials and femoral trials. This universal base component allows one post structure to support multiple trial configurations, reducing overall system complexity while maintaining sizing precision.
2Productivity
If trial components are designed to be easily swapped to evaluate different implant sizes, then the efficiency of the surgical procedure is improved, but the stability of the trial assembly may be compromised
Solution Approach 1:
The tibial insert trial is designed to nest onto the post of the tibial base trial, with the insert trial containing an aperture that receives the post. This nested configuration allows for easy attachment and detachment of different sized inserts while maintaining stable connection through the interlocking post-aperture interface.
Solution Approach 2:
The post acts as an intermediary element between the tibial base trial and the tibial insert trial. It provides a stable connection point that allows for easy swapping of inserts while maintaining assembly stability through its integrated design with both components.
3Stability of the object's composition
If a locking mechanism is added to prevent movement of the insert adaptor, then the stability of the assembly is improved, but the device complexity increases
Solution Approach 1:
The locking tab with spring clip mechanism is designed to automatically engage and lock the insert adaptor to the post without requiring additional actuators or complex control systems. The spring-loaded tab self-activates when the insert is attached, providing stable locking with minimal added complexity.
Data Source
AI summary
An orthopaedic surgical instrument system includes a tibial base trial and a tibial insert trial. An insert adaptor is sized to be positioned in an aperture defined in the tibial insert trial. The insert adaptor includes a base sized to be positioned over a post of the tibial base trial and a locking tab positioned in the base and configured to engage the post of the tibial base trial.