Reverse Shoulder Implant Offset Matching for Deltoid Tension
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Solution Overview
Problem
Existing reverse shoulder implants face challenges in matching design variables to individual patient dimensions, leading to risks such as dislocation, stiffness, and bone fractures due to improper tensioning of the deltoid muscle, with no consensus on optimal offset sizes or component configurations.
Innovation Solution
A method for designing a bespoke reverse shoulder implant that replicates the native joint's offset by determining and matching the 0 degrees and 90 degrees total lateral offsets of the implant components to the patient's native shoulder, using standard components and adjusting for bone loss and reshaping, with optional computer-aided optimization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If standard reverse shoulder implant designs are used with fixed offset dimensions, then manufacturing and surgical procedure are simplified, but the implant cannot be optimized for individual patient dimensions leading to improper deltoid muscle tensioning
Solution Approach 1:
The patent applies parameter changes by providing multiple implant components with varying offset dimensions (e.g., different glenosphere sizes, different lateral offset values). This allows the surgeon to select specific parameter combinations that match the patient's native shoulder anatomy, achieving customization without requiring completely bespoke implants for each patient.
Solution Approach 2:
The patent introduces dynamic selection capability where the offset parameters are not fixed across all implants but can be dynamically selected based on patient-specific measurements. The system allows adjustment of offset parameters to reproduce the patient's native center of rotation position, making the implant adaptable to individual anatomical variations.
2Reliability
If the lateral offset is increased to improve deltoid muscle tensioning, then shoulder stability improves, but the risk of acromial fracturing increases due to over-tensioning
Solution Approach 1:
The patent uses parameter changes to provide a range of offset values that can be selected to achieve optimal deltoid tensioning. By offering multiple offset options (e.g., 13mm, 15mm, 17mm), the system allows selection of the precise parameter that achieves sufficient stability without excessive tension that could cause acromial fracturing.
Solution Approach 2:
The patent incorporates feedback through preoperative planning where the patient's native shoulder anatomy is measured and used to determine the optimal implant offset. This feedback loop ensures the selected offset reproduces the native center of rotation, achieving appropriate deltoid tensioning that balances stability with avoidance of over-tensioning injuries.
3Measurement precision
If the glenosphere size is changed to affect the center of rotation position, then the ability to match native shoulder anatomy improves, but the complexity of component selection increases
Solution Approach 1:
The patent applies parameter changes by providing glenospheres in multiple sizes (e.g., 28.5mm, 31mm, 33.5mm, 36mm) that allow precise matching of the patient's native center of rotation position. Different glenosphere sizes create different lateral offset values, enabling accurate reproduction of native anatomy through selection of the appropriate size parameter.
Solution Approach 2:
The patent segments the implant system into modular components with standardized size increments. This segmentation allows systematic selection of glenosphere sizes that correspond to specific offset values, making the complexity manageable through organized size categories rather than requiring completely custom-designed components for each patient.
4Reliability
If customised implant design is created for each patient to reproduce native joint offset, then surgical outcomes are optimized, but manufacturing time and cost increase
Solution Approach 1:
The patent uses parameter changes to achieve customization through selection rather than creation. By providing implants with varying parameters (offset, size, orientation) that can be selected to match patient anatomy, the system achieves customized surgical outcomes without requiring custom manufacturing processes, thus maintaining ease of manufacture while improving surgical outcomes.
Solution Approach 2:
The patent creates a universal implant system that can serve multiple patient anatomies through standardized components with varying parameters. The same manufacturing processes and component families can be used across different patients by selecting appropriate parameter combinations, achieving multi-functionality that reduces manufacturing complexity while maintaining customization benefits.
Data Source
AI summary
The present invention relates to designing a reverse shoulder implant for use in a human as part of a shoulder replacement surgical procedure. It will optimise post operative function and can be used to design future implants.