Periacetabular Osteotomy Cutting Guide with Positioning Arms
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current periacetabular osteotomy surgical procedures rely heavily on the surgeon's skill and experience, leading to risks of human error and instability in cutting and realignment due to the lack of a precise cutting guide, which can result in inaccurate cuts and increased operating times.
Innovation Solution
A cutting guide system comprising a proximal and distal guide with anatomically shaped surfaces and fastening mechanisms to stabilize the guide during bone cutting, ensuring accurate alignment and realignment of the acetabulum, along with an aligner for final positioning and rotation of the bone fragments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If freehand cutting is performed by the surgeon, then the procedure can be performed with simple tools, but the cutting accuracy and reliability deteriorate due to human error and lack of precise guidance
Solution Approach 1:
The cutting guide is divided into multiple components: a guide body with a longitudinal opening for the cutting instrument, positioning arms with fastening members for securing to the bone, and an aligner with resting bases for the cut bone parts. This segmentation allows each component to perform its specific function while maintaining overall system reliability without excessive complexity.
Solution Approach 2:
The cutting guide acts as an intermediary device between the surgeon's intent and the actual bone cutting. It provides a physical framework that translates preoperative planning into accurate intraoperative execution, mediating the transition from theoretical plan to practical action while ensuring precision.
2Measurement precision
If the surgeon relies on experience and skill for cutting, then the procedure can be performed adaptively, but the consistency and precision of cutting lines deteriorate due to variability in human performance
Solution Approach 1:
The cutting guide is designed and positioned on the bone before the actual cutting begins. The positioning arms are secured to the bone using fastening members in advance, establishing a stable reference framework that will guide the entire cutting process. This preliminary setup ensures that the cutting line accuracy is maintained throughout the procedure without requiring constant surgical skill intervention.
3Reliability
If complete osteotomies are performed to free the acetabulum, then the acetabulum can be redirected to the correct position, but the operating time increases due to the complexity of multiple cuts and realignment
Solution Approach 1:
The cutting guide combines multiple functions into a single integrated device: it provides guidance for multiple osteotomy cuts, serves as a positioning tool for the acetabulum, and includes an aligner for final realignment. By merging these functions, the device reduces the need for separate tools and steps, thereby decreasing operating time while maintaining realignment accuracy.
Solution Approach 2:
The cutting guide system serves multiple purposes throughout the surgical procedure: it guides the bone cutting instrument during osteotomies, provides a stable reference for acetabular redirection, and facilitates final alignment through its integrated aligner component. This multi-functionality eliminates the need for multiple separate instruments and reduces overall procedural time.
4Manufacturing precision
If the cutting guide is designed to be stable and accurate, then the cutting precision improves, but the device becomes more complex with additional fastening and positioning mechanisms
Solution Approach 1:
The cutting guide applies local quality by providing precise positioning and fastening only at the critical interfaces where contact with the bone occurs. The positioning arms and fastening members are designed with specific anatomical contours that match the bone surface, ensuring accurate positioning without requiring complex mechanisms throughout the entire device structure.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A cutting guide for periacetabular osteotomy comprises at least a first main body (2) having a longitudinal opening (3) for the insertion of a cutting instrument (30), extending from a first end (2a) to a second end (2b) of the first main body (2) and at least two positioning and fixing arms (4a, 4b) extending away from the first main body (2) from opposite sides with respect to the longitudinal opening (3), in order to correctly position the first main body (2) on a bone and fix it thereto through respective fastening members (7).