Stylet Control Handles for Bone Anchor Trajectory Confirmation
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Solution Overview
Problem
Existing surgical procedures face challenges in efficiently and conveniently retracting stylets during bone anchor insertion, leading to potential skiving and interference with the insertion trajectory, which can cause deviations and complications.
Innovation Solution
A stylet control handle with a retention mechanism and lever system allows for controlled extension and retraction of the stylet, providing visual feedback and minimizing interference during bone anchor insertion, ensuring accurate placement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the stylet is extended beyond the distal tip of the bone anchor to facilitate accurate insertion, then the insertion accuracy is improved, but the risk of skiving and interference with insertion trajectory increases
Solution Approach 1:
The stylet control handle enables dynamic adjustment of the stylet extension length. The stylet can be extended to a first length for accurate trajectory confirmation and then retracted to a second, shorter length for safe bone anchor insertion, allowing the system to adapt the stylet length based on the surgical phase and minimize harmful effects during insertion.
Solution Approach 2:
The control handle incorporates a retention mechanism that automatically holds the stylet at the appropriate length without requiring constant manual intervention. The lever system with visual indicators provides self-regulating control, allowing the surgeon to easily adjust the stylet length while the mechanism itself maintains the correct position during insertion.
2Object-affected harmful factors
If the stylet is retracted to minimize interference during bone anchor insertion, then the skiving risk is reduced, but the ability to confirm trajectory before deployment is limited
Solution Approach 1:
The control handle allows dynamic switching between two stylet extension states: an extended state for trajectory confirmation under fluoroscopy and a retracted state for safe bone anchor insertion. The lever mechanism enables easy transition between these states, allowing the surgeon to extend the stylet for trajectory verification and then retract it to eliminate interference during the actual insertion phase.
Solution Approach 2:
The system enables preliminary trajectory confirmation by extending the stylet before the bone anchor is deployed into the bone. The surgeon can verify the insertion path under fluoroscopy with the stylet extended, then retract the stylet before insertion to prevent skiving. This preliminary action ensures safety and accuracy before the critical insertion step.
3Stability of the object's composition
If a retention mechanism is added to hold the stylet in place, then the stylet position stability is improved, but the device complexity increases
Solution Approach 1:
The retention mechanism is designed to be self-actuating through the lever system. When the lever is positioned, the retention mechanism automatically engages to hold the stylet at the correct length without requiring additional actuators or complex control systems. The mechanism uses the lever's own movement to engage and disengage the retention feature, maintaining stability while minimizing complexity.
Solution Approach 2:
The lever acts as an intermediary between the surgeon's manual input and the stylet retention mechanism. The lever translates simple manual movement into controlled engagement and disengagement of the retention feature, providing stable stylet positioning while keeping the control interface simple and intuitive for the surgeon.
4Measurement precision
If the lever is positioned to extend the stylet, then the trajectory confirmation is enabled, but the visual indication of extension distance becomes less clear
Solution Approach 1:
The control handle incorporates visual indicators that change or become prominent when the lever is positioned to extend the stylet. These visual indicators provide clear, immediate feedback to the surgeon about the extension state and approximate distance, making it easy to detect and measure the stylet extension without requiring complex measurement systems.
Data Source
AI summary
Disclosed herein are stylet control handles and related methods for extending and retracting a stylet during insertion of a bone anchor, and for providing a visual indication of the extent of extension of the stylet.