Glenoid Implant Liner Screw Decoupling for Revision Surgery
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Solution Overview
Problem
Traditional total shoulder arthroplasty (TSA) procedures often result in bone loss due to the impact of implants into bone, which can compromise joint stability, longevity, and the ease of revision surgery.
Innovation Solution
The development of a glenoid implant with a liner and a screw having a mantle and pedestal portion, configured to be securely attached to the glenoid fossa using a screw mechanism, reducing the need for bone cement and minimizing bone removal during surgery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional impact implantation method is used, then implant can be securely fixed in bone, but bone loss occurs and joint stability is compromised
Solution Approach 1:
The screw mantle portion comprises a porous material structure that enables bone ingrowth and biological fixation without requiring high-impact insertion. The porous structure allows bone tissue to grow into the implant, creating a strong biological bond that secures the implant without compromising bone stock through aggressive impactation methods.
Solution Approach 2:
The invention replaces the traditional mechanical impactation system with a screw-based fixation system. The screw threads engage with the bone and liner, providing secure fixation through rotational insertion and thread engagement rather than impact forces, thereby eliminating bone loss associated with impactation while maintaining fixation strength.
2Ease of operation
If more bone is removed to accommodate implant, then implant can be properly positioned, but joint stability and revision ease are compromised
Solution Approach 1:
The implant is divided into distinct functional components: a screw portion for secure bone engagement and a liner portion for articulation. This segmentation allows the screw to be precisely positioned and secured through threading into the bone, while the liner provides the articulating surface, eliminating the need for extensive bone removal to accommodate a monolithic implant structure.
Solution Approach 2:
The invention changes the insertion method parameter from impactation to screw-based rotational insertion. This allows precise positioning of the implant components through controlled threading, enabling proper placement with minimal bone removal compared to traditional impactation methods that require larger bone stock for secure fixation.
3Strength
If bone cement is used to secure implant, then implant can be fixed, but surgery time increases and bone health is compromised
Solution Approach 1:
The invention replaces the bone cement chemical bonding system with a mechanical screw fixation system. The screw threads provide immediate mechanical engagement with the bone and liner, eliminating the need for bone cement application, mixing, and setting time. This mechanical system achieves secure fixation faster while preserving bone health by avoiding cement-related complications.
Solution Approach 2:
The screw structure is self-fixating through its threaded design that engages with both the bone and liner. As the screw is rotated into position, the threads automatically secure the implant components together and to the bone without requiring additional materials like bone cement. This self-service mechanism reduces surgery time and eliminates cement-related bone compromise.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution allows for secure implantation of the glenoid implant with reduced bone loss, shorter surgery time, and improved joint stability, facilitating easier revision surgeries by preserving healthy bone.
Implementation Method 1
one or both of the mantle portion and the pedestal portion comprise a porous material. In some embodiments, the porous material comprises an open cell porosity structure, a closed cell porosity structure, or a combination thereof
Implementation Method 2
The pedestal portion has one or more threads disposed thereabout and configured to secure the implant to a glenoid fossa at an excision site thereof
Implementation Method 3
Articular cartilage is a smooth, load bearing, and lubricious tissue which allows one bone to slip past another bone while maintaining strength during movement
Data Source
AI summary
Embodiments described herein relate to total shoulder arthroplasty devices and related systems, methods, and kits useful in implanting glenoid implants in the glenoid fossa of scapula bones. In some embodiments, a glenoid implant device is disclosed including a screw and a liner. In some embodiments, the liner is configured to decouple from the screw during a revision surgery. In some embodiments, the liner has an inner portion configured to couple with a driver to dispose the implant at least partially into a bone.