Triangular Taproot Prosthetic Implant Torsional Stability
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Solution Overview
Problem
Conventional circular-section taproots in prosthetic implants lack resistance to torsional loads and rely heavily on surgeon intuition for proper positioning, exposing both the surgeon and patient to X-ray radiation during fluoroscopy.
Innovation Solution
A prosthetic component with a taproot having a triangular cross-section and a trabeculated structure, manufactured using Electron Beam Melting (EBM) technology, which provides superior resistance to torsional loads and includes guide elements for precise positioning, reducing the risk of incorrect placement and enhancing surgical precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a circular-section taproot is used, then the surgeon can rotate the component for intraoperative adaptations, but the taproot offers low resistance to torsional loads
Solution Approach 1:
The patent applies asymmetry by transitioning from a circular cross-section to a triangular cross-section for the taproot. This asymmetric geometry provides inherent resistance to torsional loads while maintaining the ability to rotate during insertion. The triangular shape creates geometric interlocking with the bone, preventing rotational slippage under load while still allowing controlled rotation during the implantation process.
2Ease of manufacture
If a circular-section taproot is used, then series production in different sizes is facilitated, but the surgeon lacks reference for proper positioning and must rely on fluoroscopy
Solution Approach 1:
The triangular cross-section introduces inherent directional orientation that serves as a built-in reference system. The asymmetric geometry provides visual and tactile cues for proper positioning, eliminating the need for fluoroscopy. The triangular shape can be oriented in specific anatomical directions, providing the surgeon with immediate feedback on correct placement without requiring additional imaging equipment.
Solution Approach 2:
The patent replaces the mechanical positioning system (fluoroscopy and surgeon intuition) with a geometric positioning system. The triangular cross-section itself becomes the positioning reference, substituting the need for X-ray imaging and subjective surgical judgment with an objective, built-in geometric reference that guides precise placement.
3Measurement precision
If fluoroscopy is used for positioning, then the surgeon can visualize implant placement, but both the surgeon and patient are exposed to X-ray radiation
Solution Approach 1:
The patent substitutes the radiological positioning system (fluoroscopy) with a mechanical/geometric positioning system. The triangular cross-section provides inherent orientation cues that eliminate the need for X-ray visualization. The surgeon can determine correct placement through tactile feedback and geometric alignment rather than relying on radiation-based imaging.
Solution Approach 2:
The patent converts the potential harm of fluoroscopy (radiation exposure) into a benefit by designing a taproot whose geometric features provide positive, radiation-free positioning guidance. The asymmetric triangular shape creates inherent orientation markers that guide placement without requiring harmful imaging, turning the positioning challenge into a design feature.
Data Source
AI summary
A kit for installation of prosthetic components and/or biomedical implants includes a prosthetic component having an intraosseous taproot, formed of one piece with the prosthesis, for the attachment of the prosthetic component to the bone of a patient. The prosthetic component and the taproot are made of a biocompatible metal material, and the taproot has at least one portion with a triangular cross-section, as viewed in a horizontal cross-sectional plane. At least one first guiding component for a guide wire, for guiding the insertion of a guide wire into the bone, and at least one second guiding component for an impactor having a triangular section are also included.