Patient-Specific Acetabular Guide with Registration Hooks
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Solution Overview
Problem
Current methods for hip joint arthroplasty lack precise alignment and fitting of acetabular implants due to variability in patient anatomy, leading to potential misalignment and instability during surgical procedures.
Innovation Solution
A patient-specific acetabular guide with a dome-shaped body and registration hooks, designed from three-dimensional medical images, provides a unique alignment axis and secure fitting, allowing for precise placement of acetabular implants by matching the patient's anatomy and eliminating the need for intraoperative navigation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional acetabular guides with standardized surfaces are used, then the device complexity is low and ease of manufacture is high, but the manufacturing precision and alignment accuracy deteriorate due to inability to match patient-specific anatomy
Solution Approach 1:
Patient-specific acetabular guides are designed and manufactured before surgery based on preoperative CT imaging and 3D modeling. The guides incorporate patient-specific anatomical surface matching that is determined and fabricated in advance, eliminating the need for intraoperative navigation or adjustment while achieving precise alignment
Solution Approach 2:
The acetabular guide includes a patient-specific outer surface that is a negative copy or inverse replica of the patient's actual acetabular surface geometry. This copying approach allows the guide to mate precisely with the patient's anatomy, ensuring accurate positioning without requiring complex intraoperative adjustments
2Measurement precision
If patient-specific acetabular guides are used, then the manufacturing precision and alignment accuracy improve, but the ease of manufacture and device complexity worsen due to customization requirements
Solution Approach 1:
All measurements, alignments, and customizations are performed during preoperative planning using CT imaging and 3D modeling software. The patient-specific guide design is finalized before manufacturing, allowing precise fabrication without requiring complex intraoperative measurements or adjustments
Solution Approach 2:
The patent replaces complex intraoperative mechanical navigation systems with a simpler patient-specific guide that incorporates all alignment information during preoperative planning. The guide acts as a mechanical template that directly transfers the precalculated alignment to the surgery without requiring electronic navigation or complex intraoperative measurement devices
3Productivity
If conventional guides requiring intraoperative navigation are used, then the device complexity is moderate, but the loss of time and surgical procedure complexity increase due to intraoperative adjustments
Solution Approach 1:
The patient-specific guide incorporates all alignment and positioning information determined during preoperative planning. This preliminary determination eliminates the need for time-consuming intraoperative navigation setup, adjustments, or recalibrations, allowing the surgeon to directly position the implant using the guide as a template
Solution Approach 2:
The patent extracts the complex navigation and alignment determination processes from the intraoperative phase and relocates them to the preoperative planning phase. The patient-specific guide serves as a pre-programmed template that contains all necessary alignment information, eliminating the need for intraoperative navigation systems and reducing surgical time
Data Source
AI summary
An orthopedic device includes a patient-specific acetabular guide that can be used for preparing an acetabulum of a patient to receive an acetabular implant. The acetabular guide has a dome-shaped body with a peripheral annular rim and an outer three-dimensional surface configured to match an acetabulum of a specific patient's hip joint from three-dimensional medical images of the patient's hip joint. A patient-specific registration guide is removably attached to the peripheral rim and has a longitudinal bore defining a patient-specific alignment axis with an alignment orientation configured for guiding an acetabular implant for the patient. The registration guide has a patient-specific undersurface configured to mate with a corresponding surface of periacetabular surface of the acetabulum of the patient.