Posterior SI Joint Stabilization With Press-Fit Prosthesis
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Solution Overview
Problem
Conventional SI joint stabilization methods, both open and minimally-invasive, suffer from disadvantages such as extensive tissue damage, increased risk of complications, difficulty in placement, and structural inadequacies of prostheses, leading to pain and instability in dysfunctional sacroiliac joints.
Innovation Solution
A minimally-invasive system for stabilizing SI joints using a posterior approach, comprising an elongated guide probe, defect creation assembly, and prosthesis deployment assembly, with a prosthesis designed for secure engagement and optional biologically active compositions, facilitated by image capture and drill guide assemblies for precise placement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional open surgery methods are used for SI joint stabilization, then stabilization can be achieved, but extensive tissue damage and increased operative time occur
Solution Approach 1:
The surgical approach is divided into distinct modular components: a reamer for creating the bone defect, a prosthesis for stabilization, and a delivery system for minimally invasive placement. This segmentation allows each component to be optimized independently and reduces overall tissue damage by avoiding extensive soft tissue dissection required by open surgery.
Solution Approach 2:
A delivery system acts as an intermediary tool to transport the prosthesis through soft tissue to the SI joint site. This intermediary mechanism enables minimally invasive placement without requiring direct open access to the joint, thereby reducing tissue damage while maintaining stabilization reliability.
2Object-affected harmful factors
If conventional minimally-invasive methods are used, then tissue damage is reduced, but prosthesis placement difficulty increases
Solution Approach 1:
Image capture apparatus provides real-time feedback during the surgical procedure, allowing the surgeon to visualize the reamer and prosthesis positioning. This feedback mechanism guides precise placement through soft tissue while maintaining minimally invasive approach, thereby reducing tissue damage without compromising placement ease.
Solution Approach 2:
The delivery system serves as an intermediary that simplifies prosthesis placement through its structured design with engagement features. This intermediary tool translates surgical control into precise prosthesis positioning, reducing placement difficulty while maintaining the benefits of minimally invasive surgery.
3Reliability
If existing prosthesis designs are used, then stabilization can be achieved, but structural inadequacies lead to pain and instability
Solution Approach 1:
The prosthesis is designed with locally optimized features: a reamer portion with specific geometry for bone engagement, a prosthesis body with appropriate rigidity, and engagement features tailored to the SI joint anatomy. This local quality optimization ensures structural adequacy and eliminates pain and instability while maintaining stabilization reliability.
Data Source
AI summary
Systems are described for stabilizing a dysfunctional sacroiliac (SI) joint of a subject. The systems include a tool assembly and a defect creation assembly, and a prosthesis. The tool assembly is adapted to create a pilot SI joint opening in the dysfunctional SI joint; portions of which being disposed in the sacrum and ilium bone structures. The prosthesis is sized and configured to be press-fit into the pilot SI joint opening, wherein the pilot SI joint opening transitions to a larger post-prosthesis insertion SI joint opening and the prosthesis is securely engaged to the sacrum and ilium bone structures. The system optionally includes an image capture apparatus adapted to capture images reflecting positions and/or orientations of the tool assembly when disposed in the subject's body.