Universal Tibial Insert with Symmetrical Base and Keyed Lock Plate
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Solution Overview
Problem
Current tibial inserts and baseplates for knee replacement surgeries are directional, requiring separate sets for right and left knees, leading to increased manufacturing costs, inventory complexity, and the risk of incorrect implantation, which necessitates revision surgeries.
Innovation Solution
A universal tibial insert with a symmetrical base and articular surface geometry that can be oriented 180 degrees relative to the tibial baseplate, allowing it to be compatible with both right and left knees, featuring reciprocal side geometries for congruence with medial and lateral condyles, and a keyed lock plate for secure engagement with the baseplate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If directional tibial inserts and baseplates are manufactured for right and left knees separately, then congruence with medial condyle can be optimized for each side, but manufacturing costs and inventory complexity increase twofold
Solution Approach 1:
The tibial insert and baseplate are designed with bilateral symmetry allowing a single component to function in both right and left knee applications. The articular surface geometry maintains substantial congruence with the medial condyle regardless of orientation, enabling universal use across different knee sides while reducing part count and inventory requirements by half
Solution Approach 2:
The invention employs strategic asymmetry in the articular surface geometry to achieve substantial congruence with the medial condyle while maintaining overall bilateral symmetry of the component. The asymmetric medial congruence features are replicated in mirror image on both sides of the insert, allowing the same component to provide optimized medial condyle contact in both right and left knee applications
2Reliability
If separate tibial inserts are manufactured for right and left knees, then correct implantation can be ensured, but the risk of incorrect implantation increases due to potential human error
Solution Approach 1:
By designing the tibial insert and baseplate as universal components that can be correctly implanted in either right or left knee, the invention eliminates the risk of incorrect sided implantation. The symmetrical design with replicated medial congruence features ensures proper function regardless of which knee receives the implant, removing the possibility of using the wrong sided component
3Manufacturing precision
If two sets of tibial inserts and baseplates are manufactured for right and left knees, then specific optimization for each knee can be achieved, but device complexity and part count increase
Solution Approach 1:
The invention reduces the part count from four components (right insert, left insert, right baseplate, left baseplate) to two universal components (one insert design, one baseplate design) that can serve both right and left knee applications. The universal components maintain side-specific optimization through their symmetrical design with replicated medial congruence features
Solution Approach 2:
The invention merges the previously separate right and left sided insert designs into a single universal insert design. By combining the functional requirements of both sided inserts into one component with bilateral symmetry and replicated medial congruence features, the invention simplifies the overall system while maintaining side-specific performance
Data Source
AI summary
The universal tibial insert includes a keyed lock plate generally symmetrical across a median plane and a frontal plane and is selectively engageable with an asymmetrical tibial base plate in a first orientation and a second orientation approximately 180° relative to the first orientation. This allows an upwardly presented articular surface to reciprocally interface with a medial condyle and a lateral condyle of a femoral component in articulatory relation therewith when the universal tibial insert is in either of the first orientation or the second orientation.