Patient-Specific Glenoid Guides for Shoulder Arthroplasty
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Solution Overview
Problem
Current shoulder arthroplasty procedures face challenges in accurately aligning and positioning implants due to the variability in patient anatomy, leading to potential misalignment and suboptimal outcomes in both anatomic and reverse shoulder arthroplasty.
Innovation Solution
The development of patient-specific glenoid guides with preoperatively configured alignment axes and patient-specific surfaces based on 3D images of the shoulder joint, allowing for precise guidance of glenoid implants and drill guides to match individual anatomical features, enabling accurate implant placement and orientation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional guides and instruments are used for shoulder arthroplasty, then the procedure can be performed with standard equipment, but accurate alignment and positioning of implants cannot be achieved due to variability in patient anatomy
Solution Approach 1:
Patient-specific alignment guides are manufactured preoperatively based on 3D imaging and computer modeling of the patient's unique anatomy. The guides incorporate patient-specific anatomical surfaces that are created before surgery to ensure precise alignment during the procedure, eliminating the need for intraoperative adjustment and accommodating anatomical variability.
Solution Approach 2:
The patient-specific guide includes a negative impression or copy of the patient's unique glenoid surface anatomy. This copied anatomical surface is integrated into the guide structure, allowing the guide to mate precisely with the patient's anatomy and transfer the unique geometric characteristics into the alignment system for accurate implant positioning.
2Manufacturing precision
If patient-specific guides are manufactured based on 3D imaging and preoperative planning, then implant placement accuracy is improved, but device complexity and manufacturing requirements increase
Solution Approach 1:
The patient-specific guide is divided into distinct functional components: a base portion with patient-specific anatomical mating surfaces, alignment features that define implant orientation, and interface features that connect to implant instrumentation. This segmentation allows each component to be optimized for its specific function while simplifying manufacturing and assembly.
Solution Approach 2:
The patient-specific guide serves multiple functions: it provides a unique anatomical reference surface for positioning, defines the alignment axis for implant insertion, guides the orientation of implant components, and interfaces with standard implant instrumentation. By integrating these functions into a single device, the guide achieves high precision without proportionally increasing complexity.
Data Source
AI summary
A glenoid guide has an upper surface and a lower surface, wherein the lower surface is a patient-specific surface configured as a negative surface of a glenoid face based on a three-dimensional image of a shoulder joint of a patient reconstructed preoperatively from image scans of the shoulder joint of the patient. The glenoid guide includes an anatomic tubular drill guide extending from the upper surface along an anatomic alignment axis configured preoperatively with a patient-specific orientation and insertion location for guiding a glenoid implant into the glenoid face for anatomic shoulder arthroplasty. The glenoid guide includes a reverse tubular drill guide extending from the upper surface along a reverse alignment axis configured preoperatively with a patient-specific orientation and insertion location for guiding a glenoid baseplate into the glenoid face for reverse shoulder arthroplasty.