Stemless Humeral Prosthesis Structure for Bone-Preserving Fixation
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Solution Overview
Problem
Conventional shoulder prosthetics require a stem to be inserted into the humeral canal, increasing complexity, surgical time, cost, and trauma, and causing additional bone removal and post-operative pain during shoulder arthroplasty.
Innovation Solution
A stemless humeral component with a central body and multiple arms that are integrally formed with a central body, providing structural support for a prosthetic humeral head without the need for a stem, utilizing a Morse taper or tool-engaging shape for secure installation and allowing bone ingrowth or ongrowth for stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a stem is inserted into the humeral canal to provide structural support, then the prosthetic implant achieves adequate strength and stability, but the device complexity, surgical time, and bone removal increase
Solution Approach 1:
The patent removes the stem component from the prosthetic implant design, extracting the element that causes surgical complexity while maintaining structural support through alternative means (direct placement on the humeral head without stem insertion into the humeral canal)
Solution Approach 2:
The prosthetic implant is divided into separate components: a humeral head portion and a separate stemless body, allowing the humeral head to be supported directly on the humeral condyle without requiring a continuous stem structure
2Strength
If a stem is inserted into the humeral canal to provide structural support, then the prosthetic implant achieves adequate strength and stability, but the surgical time and cost increase
Solution Approach 1:
The stem insertion step is removed from the surgical procedure by eliminating the stem component, thereby reducing surgical time while maintaining structural support through direct humeral head placement
3Strength
If a stem is inserted into the humeral canal to provide structural support, then the prosthetic implant achieves adequate strength and stability, but additional bone removal and post-operative pain occur
Solution Approach 1:
The patent eliminates the stem component that requires insertion into the humeral canal, thereby preserving bone tissue and reducing post-operative pain while maintaining structural support through alternative design
Solution Approach 2:
The design parameters of the prosthetic implant are changed to eliminate the stem portion, altering the insertion method from canal-based to surface-based placement, thereby reducing bone trauma
Data Source
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AI summary
A prosthesis is provided and may include a central body having a longitudinal axis and a plurality of arms extending from the central body in a direction substantially perpendicular to the longitudinal axis. The plurality of arms may each include a first planar surface, a second planar surface, and a third planar surface that are each formed at an obtuse angle relative to one another to define an outer shape of the prosthesis.