Stemless Shoulder Prosthesis Fixation Without Humeral Canal Insertion
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Solution Overview
Problem
Conventional shoulder prosthetics require insertion of a stem into the humeral canal, increasing surgical complexity, bone removal, trauma, and post-operative pain, while stemless prostheses lack effective fixation methods.
Innovation Solution
Development of shoulder prostheses with stemless and stemmed humeral components, featuring an anchor member, articulating portion, and coupling member, which allow for secure fixation without the need for a humeral canal insertion, reducing bone loss and surgical complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a stem is inserted into the humeral canal for fixation, then implant stability is improved, but bone loss and surgical complexity increase
Solution Approach 1:
The invention extracts the stem component from the traditional shoulder prosthesis design, creating a stemless humeral component that achieves fixation through a base portion with bone-engaging features directly on the humeral head, thereby eliminating the need for humeral canal insertion and reducing bone loss
Solution Approach 2:
The humeral component is segmented into distinct functional portions: a base portion with bone-engaging features for direct fixation, an articulating portion for joint movement, and optional coupling members. This segmentation allows the base portion to provide stable fixation without requiring a stem in the humeral canal
2Stability of the object's composition
If a stem is inserted into the humeral canal for fixation, then implant stability is improved, but surgical complexity and trauma increase
Solution Approach 1:
By removing the stem component entirely, the surgical procedure is simplified to avoid canal preparation, stem insertion, and canal packing steps, reducing both surgical time and operative trauma while maintaining fixation stability through the base portion's bone-engaging features
Solution Approach 2:
The invention changes the fixation mechanism from endosteal (within the canal) to cortical/surface-based fixation through the base portion, altering the surgical approach from canal reaming and stem insertion to direct base portion implantation on the humeral head surface
3Stability of the object's composition
If a stem is inserted into the humeral canal for fixation, then implant stability is improved, but post-operative pain increases
Solution Approach 1:
Extracting the stem eliminates the source of post-operative pain associated with canal preparation and stem insertion, while the base portion provides sufficient stability through direct bone engagement features that cause minimal trauma
4Loss of substance
If a stemless design is used to reduce bone loss, then bone conservation is improved, but implant fixation stability deteriorates
Solution Approach 1:
The base portion incorporates localized bone-engaging features with specific geometric configurations designed to optimize stress distribution and bone ingrowth at the implant-bone interface, providing stable fixation without requiring a stem in the humeral canal
Solution Approach 2:
The bone-engaging features may incorporate surface treatments or coatings that enhance osseointegration, combining mechanical interlocking with biological bonding to achieve stable fixation in a stemless design
Data Source
AI summary
Implants, device, systems and methods for replacing an articulation surface in a joint, for example, shoulder prostheses with stemless humeral components or stemmed humeral components. Methods for using the shoulder prostheses with stemless humeral components or stemmed humeral components are also disclosed.