Patient-Specific Glenoid Guide for Shoulder Arthroplasty
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Solution Overview
Problem
Current shoulder arthroplasty procedures lack precise alignment and implantation tools, leading to variability in surgical outcomes and potential complications due to the lack of patient-specific guides for anatomic and reverse shoulder arthroplasty.
Innovation Solution
Development of patient-specific glenoid guides with preoperatively configured alignment axes and drill guides that match the individual anatomy of the patient, allowing for precise placement of implants and alignment during both anatomic and reverse shoulder arthroplasty procedures, utilizing 3D imaging and CAD software for custom manufacturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional guides and instruments are used for shoulder arthroplasty, then the surgical procedure can be performed with standard tools, but alignment precision and implant positioning accuracy deteriorate due to lack of patient-specific customization
Solution Approach 1:
Patient-specific alignment guides are designed and manufactured before surgery based on preoperative imaging data (CT or MRI scans). The guides incorporate patient-specific anatomical surface geometry and pre-calculated alignment parameters, allowing precise implant positioning to be achieved during surgery without complex intraoperative adjustments.
Solution Approach 2:
The alignment guides are created as physical or digital copies of the patient's specific anatomical surfaces. By replicating the unique glenoid and scapular anatomy from imaging data, the guides can be precisely fitted to the patient's bone surfaces intraoperatively, ensuring accurate alignment without requiring complex measurement procedures during surgery.
2Manufacturing precision
If patient-specific guides are manufactured based on 3D imaging and CAD software, then implant positioning accuracy improves, but manufacturing time and process complexity increase
Solution Approach 1:
All manufacturing calculations, alignment determinations, and design decisions are completed during the preoperative planning phase using CAD software. The guides are manufactured with pre-determined alignment parameters and anatomical surface geometries, eliminating the need for complex intraoperative measurements and adjustments.
Solution Approach 2:
Complex mechanical measurement and alignment procedures during surgery are replaced by digital imaging (CT/MRI), computer-aided design (CAD), and precision manufacturing processes. The alignment information is derived from digital models rather than manual mechanical measurements, improving both accuracy and manufacturing efficiency.
3Reliability
If conventional alignment methods are used, then the surgical procedure is simpler to perform, but surgical outcomes vary due to lack of precise alignment control
Solution Approach 1:
Optimal alignment parameters and implant positioning are determined during preoperative planning based on patient-specific anatomy and surgical goals. The patient-specific guides incorporate these pre-calculated parameters, ensuring consistent and reliable surgical outcomes by eliminating variability in intraoperative alignment decisions.
Solution Approach 2:
The alignment guides are designed with local anatomical specificity, incorporating the unique geometry of each patient's glenoid, scapula, and surrounding structures. This localized customization ensures that the guidance is precisely tailored to the specific anatomical features of each patient, improving reliability of outcomes.
4Adaptability or versatility
If standard guides are used for both anatomic and reverse shoulder arthroplasty, then device inventory is simplified, but precision for specific anatomical variations deteriorates
Solution Approach 1:
During preoperative planning, the specific surgical approach (anatomic or reverse) is determined and the alignment parameters are optimized for that specific procedure type. The patient-specific guide is then designed with the appropriate alignment parameters for the chosen approach, ensuring precision for the specific anatomical and procedural requirements.
Solution Approach 2:
Each patient-specific guide is customized not only for anatomical geometry but also for the specific surgical procedure type (anatomic or reverse arthroplasty). The guide incorporates procedure-specific alignment parameters and anatomical references, allowing precise guidance for the particular surgical approach being used.
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.