Stemless Humeral Anchoring Component Eccentric Positioning
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Solution Overview
Problem
Existing stemless humeral anchoring components lack optimal torsional stability due to being positioned in cancellous bone areas with low density, which compromises their secure anchoring in the humerus.
Innovation Solution
A stemless humeral anchoring component with three anchoring wings, where one lateral wing and two medial wings are angularly spaced between 110 and 130 degrees, with the lateral wing being longer to extend into a lower density lateral region and the medial wings into a higher density medial region, enhancing bone density support and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the anchoring component is positioned in the central bone area of the resected epiphyseal and metaphyseal portions, then the component can be easily implanted, but the torsional stability is insufficient due to low bone density
Solution Approach 1:
The patent applies asymmetry by positioning the anchoring component eccentrically rather than centrally in the humeral head. The component is designed with an asymmetric weight distribution where the greater tubercle side has lower density and the lesser tubercle side has higher density, creating a natural balance point that shifts the component position to achieve optimal torsional stability while maintaining ease of implantation.
Solution Approach 2:
The patent applies local quality by creating non-uniform bone density distribution within the anchoring component itself. The component has a first region with lower bone density on the greater tubercle side and a second region with higher bone density on the lesser tubercle side. This internal quality differentiation allows the component to naturally position itself and provide optimal torsional stability while being easy to implant.
2Ease of manufacture
If the anchoring component is positioned in the cancellous bone area with low density, then the implantation is simpler, but the secure anchoring is compromised
Solution Approach 1:
The patent uses asymmetry in the bone density distribution within the anchoring component to create a natural balance that favors both ease of implantation and secure anchoring. The asymmetric design with lower density on one side and higher density on the other allows the component to be easily placed while naturally finding a stable position that provides reliable anchoring.
Solution Approach 2:
The patent applies parameter changes by varying the bone density parameter across different regions of the anchoring component. The component transitions from lower bone density on the greater tubercle side to higher bone density on the lesser tubercle side, creating optimal conditions for both easy implantation and secure long-term anchoring.
3Ease of manufacture
If the anchoring component uses uniform bone density distribution, then the manufacturing is simpler, but the torsional stability is reduced
Solution Approach 1:
The patent applies local quality by creating different bone density characteristics in different regions of the anchoring component. The first region on the greater tubercle side has lower bone density while the second region on the lesser tubercle side has higher bone density. This localized quality differentiation enhances torsional stability while remaining manufacturable through controlled density variation techniques.
Data Source
AI summary
A method for securing a stemless humeral includes positioning the stemless humeral anchoring component to the humerus such that a lateral anchoring wing extends in a direction of a lateral side of the humerus into a lateral region and two medial anchoring wings face a medial side of the humerus in a medial region. The lateral region has a lower bone density relative to the medial region. The stemless humeral anchoring component is positioned eccentrically such that the anchoring stud and the two medial anchoring wings are anchored in the medial region. The stemless humeral anchoring component is secured in resected proximal epiphyseal and metaphyseal portions of the humerus without reaching a diaphyseal portion of the humerus.