SI Joint Decortication Instrument for Precise Fusion Preparation

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Solution Overview

Problem

Conventional sacroiliac joint fusion procedures are invasive, risky, and often fail to adequately stabilize the joint, leading to complications such as damage to neurovascular elements, mal-alignment, and recurrent pain due to insufficient removal of articular surfaces.

Innovation Solution

A surgical preparation tool system for the sacroiliac joint that includes a trial tool assembly, cutting tool, and drill guide assembly for non-transverse delivery, allowing precise preparation of the joint surfaces for implantation, including tools for removing articular cartilage and abrading bone surfaces.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Stability of the object's composition

If conventional transverse screw fixation is used for sacroiliac joint fusion, then joint stabilization is achieved, but neurovascular elements are at risk of damage

Engineering Contradiction:

Improvejoint stabilizationVSAvoidneurovascular damage risk

Core Design Contradiction:

Stability of the object's compositionVSObject-affected harmful factors

Solution Approach 1:

The patent inverts the conventional transverse approach by using longitudinal trajectory screws that enter through the iliac crest and advance parallel to the joint plane, then curve medially to engage the sacrum. This inverted trajectory avoids the neurovascular elements located in the transverse plane, eliminating the risk of neurovascular damage while achieving joint stabilization.

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The patent changes the dimensional approach from transverse (horizontal) screw placement to longitudinal (vertical) screw placement. By advancing screws in a longitudinal trajectory through the ilium and sacrum rather than transversely across the joint, the system accesses a different spatial dimension that avoids neurovascular structures while maintaining fixation stability.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Measurement precision

If open surgical approach is used for sacroiliac joint fusion, then direct visualization and fixation are achieved, but soft tissue damage and recovery time increase

Engineering Contradiction:

Improvejoint preparation precisionVSAvoidsoft tissue damage

Core Design Contradiction:

Measurement precisionVSObject-affected harmful factors

Solution Approach 1:

The patent introduces image guidance systems and specialized drilling guides as intermediary tools that enable precise joint preparation and screw placement through minimally invasive percutaneous approaches. These intermediaries provide the visualization and precision previously requiring open surgery, allowing accurate articular surface removal and screw trajectory control without large incisions or extensive soft tissue disruption.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent replaces the mechanical open surgical approach with image-guided percutaneous techniques. Instead of direct visual inspection and manual preparation through large incisions, the system uses fluoroscopy or CT guidance with specialized instruments to achieve precise joint preparation and fixation through small puncture sites, significantly reducing soft tissue trauma.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Loss of time

If insufficient articular surface removal is performed, then surgical time is reduced, but fusion stability and pain relief are compromised

Engineering Contradiction:

Improvesurgical timeVSAvoidfusion stability

Core Design Contradiction:

Loss of timeVSReliability

Solution Approach 1:

The patent employs preliminary action through pre-bored channels and pre-positioned screws that facilitate controlled articular surface removal. By establishing the screw trajectory and depth beforehand, the surgeon can efficiently remove the necessary articular surfaces along the predetermined path without excessive reaming or bone removal, achieving adequate fusion preparation in less time with improved reliability.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent changes the parameters of articular surface removal by using longitudinal screw trajectories that naturally define the removal zone. Instead of removing large transverse surfaces, the system removes bone along the longitudinal screw path, changing the geometry and extent of removal to achieve sufficient fusion stability with less surgical time and less aggressive bone resection.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS12569262B2Decortication instrumentation for posterior sacroiliac joint fusion

Publication Date: 2026.03.10 JCBD LLC

AI summary

A drill-less method of stabilizing a sacroiliac joint using a multimodal abrading device to create a rich environment for bony fusion. The unique decortication instrument includes an integral slap hammer assembly joined with a rasp-box osteotome tooling head to simultaneously remove cartilage from the joint while preparing the sacrum and ilium down to bleeding bone. Subsequent to joint preparation, an implant with a large bone graft window may be implanted into the prepared SI joint through a specially designed access cannula.