Posterior SI Joint Stabilization With Image-Guided Prosthesis Placement
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Solution Overview
Problem
Conventional SI joint stabilization methods, both open and minimally-invasive, suffer from significant disadvantages such as extensive tissue damage, increased risk of complications, difficulty in visualization and placement, and structural inadequacies of prostheses, leading to suboptimal stabilization and potential immune responses.
Innovation Solution
A minimally-invasive method involving a posterior approach using a tool assembly with a guide pin, drill guide, and prosthesis deployment system to create a pilot opening and securely insert a SI joint prosthesis, ensuring optimal placement and engagement with image capture for guidance, and optionally using osteogenic compositions for tissue remodeling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional open surgical methods are used for SI joint stabilization, then stabilization can be achieved, but extensive tissue damage and increased risk of complications occur
Solution Approach 1:
The surgical approach is divided into multiple small incisions (1-2 cm) distributed along the posterior midline, each providing access to specific regions of the SI joint. This segmentation allows stabilization to be achieved while minimizing the extent of tissue disruption compared to a single large open incision.
Solution Approach 2:
The patent employs a posterior midline approach, accessing the SI joint from a different anatomical dimension (posterior rather than anterior or lateral). This dimensional change in surgical approach allows stabilization to be achieved with minimal soft tissue disruption, as the posterior midline provides a natural access pathway that avoids extensive muscle cutting.
2Object-affected harmful factors
If minimally-invasive methods are used, then tissue damage is reduced, but difficulty in visualization and placement occurs
Solution Approach 1:
Image capture is performed at multiple stages during the surgical procedure - before incision, during guide pin placement, during prosthesis insertion, and after stabilization. This preliminary and intraoperative imaging allows the surgeon to visualize the SI joint anatomy and prosthesis placement in real-time, overcoming the visualization difficulty inherent in minimally-invasive approaches.
Solution Approach 2:
Image capture serves as an intermediary between the minimally-invasive surgical approach and the need for visualization. The imaging system provides a visual intermediary that allows the surgeon to see through the limited access points, effectively bridging the gap between minimal tissue disruption and adequate visualization.
3Reliability
If conventional prostheses are used, then stabilization can be achieved, but structural inadequacies lead to suboptimal stabilization and potential immune responses
Solution Approach 1:
The prosthesis is constructed using composite materials including a biocompatible polymer matrix reinforced with structural elements. This composite construction provides both the structural integrity needed for effective stabilization and the biocompatibility required to minimize immune responses, resolving the contradiction between strength and biological compatibility.
Solution Approach 2:
The prosthesis design incorporates specific geometric parameters and material properties optimized for SI joint stabilization. The structural parameters (shape, size, configuration) and material parameters (biocompatibility, strength) are carefully selected to achieve optimal stabilization effectiveness while minimizing structural inadequacies and immune responses.
4Manufacturing precision
If extensive surgical access is provided, then placement precision can be achieved, but loss of time and increased complexity occur
Solution Approach 1:
The guide pin and drill guide assembly serve multiple functions: they provide precise angular guidance for the incisions, serve as guides for prosthesis insertion, and facilitate accurate positioning of the SI joint prosthesis. This multi-functionality achieves placement precision without requiring additional time for separate alignment procedures.
Solution Approach 2:
Image capture creates a visual record (copy) of the SI joint anatomy and prosthesis placement at multiple stages. This visual copying allows for precise verification of placement accuracy without requiring additional surgical time for measurement or adjustment, as the images provide immediate feedback on positioning precision.
Data Source
AI summary
Methods are described for conducting minimally invasive medical interventions utilizing instruments and assemblies thereof to stabilize and/or fixate a dysfunctional sacroiliac (SI) joint. In one embodiment, a drill assembly is advanced from a posterior approach into the SI joint to create a pilot SI joint opening; portions of which being disposed in the sacrum and ilium bone structures. After the pilot SI joint opening is created, a SI joint prosthesis is inserted into the pilot SI joint opening, wherein the SI joint prosthesis is positioned in the dysfunctional SI joint at a distance of at least 3.0 mm away from the SI joint dorsal recess.