Conductivity-Sensing SI Joint Drill for Precise Posterior Access
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Solution Overview
Problem
Current surgical techniques for accessing the Sacroiliac (SI) joint via posterior approaches lack precision, often requiring extensive surgical exposure and dissection, and result in incorrect implant placement, leading to procedure failure and potential need for revision surgery.
Innovation Solution
A method and system using a cannulated surgical instrument with electrodes at its distal tip to sense electrical conductivity, providing real-time audible and visual alerts for accurate placement, allowing precise access to the SI joint via a posterior-oblique approach, guided by anatomical landmarks and fluoroscopy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a posterior approach is used to access the SI joint, then surgical risk is reduced and the approach is more straightforward, but precise implant placement becomes difficult due to complex joint geometry and lack of direct visualization
Solution Approach 1:
The system provides real-time electrical conductivity feedback through audible and visual alerts, allowing the surgeon to continuously monitor instrument position and adjust accordingly. The conductivity signal changes as the instrument approaches bone, enters the joint space, and reaches the target location, enabling precise placement without direct visualization.
Solution Approach 2:
The patent replaces mechanical visualization methods (direct line of sight, fluoroscopy) with an electrical field-based sensing system. Electrical conductivity measurements detect tissue properties and instrument position, substituting the need for mechanical imaging or direct visual confirmation.
2Ease of manufacture
If current surgical techniques are used without electrical conductivity guidance, then the surgical procedure can be performed with standard equipment, but extensive surgical exposure and dissection are required and implant placement accuracy decreases
Solution Approach 1:
Real-time electrical conductivity feedback provides continuous information about instrument position and tissue characteristics, enabling precise implant placement through minimal dissection. The feedback system guides the surgeon through the procedure, replacing the need for extensive visual exposure.
Solution Approach 2:
The system utilizes changes in electrical conductivity parameters as the instrument progresses through different tissue types. By monitoring conductivity variations, the system provides information about instrument depth and position, enabling precise placement with minimal surgical exposure.
3Manufacturing precision
If electrical conductivity sensing is implemented in real-time, then implant placement precision is improved, but the device complexity increases with additional sensors and monitoring systems
Solution Approach 1:
The cannulated instrument serves multiple functions: it provides mechanical access to the joint space, acts as a conduit for the stylet, and incorporates electrical conductivity sensors. This multi-functionality reduces the need for separate specialized tools, offsetting the added complexity with versatility.
Solution Approach 2:
The patent combines the sensing elements, signal processing, and alert generation into an integrated system that works with the existing surgical instrument. The conductivity sensors are embedded in the stylet, and the control system merges electrical signals with surgical guidance functions.
4Measurement precision
If traditional navigation or fluoroscopy methods are used for landmark identification, then accurate SI joint location can be determined, but the procedure requires additional equipment and time
Solution Approach 1:
The electrical conductivity sensors are pre-positioned on the instrument before surgery, allowing immediate detection of tissue properties upon insertion. This eliminates the need for separate pre-operative imaging or intra-operative navigation setup, saving time while maintaining accuracy.
Solution Approach 2:
The system replaces complex mechanical navigation systems and fluoroscopy equipment with electrical conductivity sensing. The simpler electrical measurement system provides equivalent or superior landmark detection accuracy without requiring additional heavy equipment or extended procedure time.
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
Enables minimally invasive, precise implant placement into the SI joint, reducing the risk of implant misplacement and subsequent surgeries by using electrical conductivity feedback for accurate tool guidance.
Implementation Method 1
a cannulated surgical instrument with electrodes at its distal tip to sense electrical conductivity, providing real-time audible and visual alerts for accurate placement
Data Source
AI summary
The present disclosure provides systems including a cannulated surgical drill tool with electrical conductivity sensing capabilities, and surgical techniques for using such tools in minimally invasive surgical procedures for accessing the SI joint via a posterior approach using an electrical conductivity feedback to facilitate accurate placement into or across the SI joint. For example, the cannulated surgical drill tool may include one or more pairs of electrodes at its distal penetration tip configured to measure electrical conductivity of tissue in contact with the distal tip during a drilling procedure and may emit an alert indicative of the measured electrical conductivity, and accordingly, the type of tissue in contact with the distal tip of the cannulated surgical drill tool, in real-time.