Modular Sacroiliac Fusion Implant with Segmented Anchor
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Solution Overview
Problem
Existing SI joint stabilization devices are difficult to install and may not be suitable for all patients, leading to inadequate fixation and increased discomfort post-operatively and long-term.
Innovation Solution
A modular implantable device for SI joint fusion with an externally threaded joint fusion portion and a smaller diameter anchor portion, allowing for easier installation and adaptation to individual patient needs, including a stabilizing driver and installation sleeve for overcoming obstructions during placement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional SI joint stabilization screws are used, then the SI joint can be stabilized, but the devices are difficult to install and may not be suitable for all patients
Solution Approach 1:
The device is divided into two distinct segments: an anchor portion for insertion into the ilium and a joint fusion portion for placement across the SI joint. This segmentation allows each portion to be optimized for its specific function and enables modular assembly that adapts to different patient anatomies and surgical requirements.
Solution Approach 2:
The device is designed with universal applicability through its modular construction and adjustable features. The anchor portion can be implanted in various orientations and positions within the ilium, while the joint fusion portion can accommodate different joint spacings and angles, making the device suitable for a wide range of patient anatomies and clinical scenarios.
2Reliability
If traditional fixation methods are used, then spinal equipment can be attached to the pelvis, but patients experience pain and hardware failure at the attachment point
Solution Approach 1:
The device employs local quality optimization by providing enhanced surface area and improved stress distribution at the anchor-bone interface. The anchor portion's design features increased contact area with the ilium, while the joint fusion portion provides extended surface area for spinal equipment attachment, reducing stress concentration and minimizing pain and hardware failure risks.
3Strength
If a single large-diameter device is used for SI joint fusion, then fixation is provided, but installation is difficult and patient comfort is reduced
Solution Approach 1:
The device is divided into two distinct segments: an anchor portion for insertion into the ilium and a joint fusion portion for placement across the SI joint. This segmentation allows each portion to be optimized for its specific function and enables modular assembly that adapts to different patient anatomies and surgical requirements.
Solution Approach 2:
The anchor portion is designed with a smaller diameter that allows it to be nested within or alongside the larger joint fusion portion during implantation. This nested configuration facilitates easier installation through minimally invasive approaches while maintaining the structural strength needed for reliable fixation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The device provides secure fixation and fusion of the SI joint with reduced discomfort and longer-lasting pelvic fixation, minimizing hardware-related complications compared to traditional methods.
Implementation Method 1
The joint fusion portion is externally threaded and is configured to, when surgically implanted, extend across the SI joint
Implementation Method 2
The anchor portion in turn extends distally from the SI joint fusion portion and is configured for implanting entirely within the patient's ilium adjacent the SI joint
Data Source
AI summary
An implantable device for sacroiliac (“SI”) joint fusion and an associated method employ an SI joint fusion portion and an anchor portion of smaller diameter than the SI joint fusion portion and that extends distally from a distal end of the SI joint fusion portion. The SI joint fusion portion is externally threaded and is configured to, when surgically implanted, extend across the SI joint. The anchor portion in turn extends distally from the SI joint fusion portion and is configured for implanting entirely within the patient's ilium adjacent the SI joint. In certain configurations, the joint fusion portion is configured to enable fixation of spinal equipment at a proximal end of the joint fusion portion. A stabilizing driver is additionally provided to aid in placement of the device when obstructions are present.