Articulating Vertebral Rod Insertion Device
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Solution Overview
Problem
Minimally invasive spine surgery techniques face challenges in inserting vertebral fixation members, particularly due to limited access and the need for precise rod placement, which can result in increased tissue damage and longer recovery times.
Innovation Solution
An articulating insertion device with an outer guide tube, pin assembly, and pusher member that allows for controlled pivoting of the elongate stabilization member from a parallel to a perpendicular orientation, enabling more precise placement and reducing tissue damage by allowing longer rods to be used without additional incisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional open spine surgery techniques are used, then precise rod placement can be achieved, but extensive tissue damage and muscle retraction occur
Solution Approach 1:
The insertion device is divided into multiple functional segments: an outer guide tube for structural support and direction, an inner pusher member for actuating rod movement, and a clamping mechanism for securing the rod. This segmentation allows each component to perform its specific function efficiently while minimizing overall tissue disruption
Solution Approach 2:
The insertion device acts as an intermediary tool that bridges the gap between the surgeon's control and the rod placement. It provides a controlled interface for delivering the rod to the target location through a minimally invasive path, reducing direct tissue manipulation while maintaining placement precision
2Object-affected harmful factors
If minimally invasive techniques with limited access are used, then tissue damage is reduced, but rod insertion control and precision are compromised
Solution Approach 1:
The insertion device incorporates dynamic elements including a movable pusher member that can be actuated to push the rod, and a clamping mechanism that can engage and disengage the rod. These dynamic features provide the surgeon with controlled manipulation capabilities through a minimally invasive access point
Solution Approach 2:
The device utilizes the longitudinal dimension of the guide tube to provide leverage and control for rod insertion. By extending the guide tube through the minimally invasive access point and using the pusher member along the same axis, the surgeon gains mechanical advantage and control without requiring wider exposure
3Device complexity
If fixed position rod holders are used, then device simplicity is maintained, but rod placement flexibility and precision are limited
Solution Approach 1:
The insertion device transitions from a fixed position to a dynamic positioning system where the pusher member can move along the guide tube and the clamping mechanism can engage at different positions. This dynamic capability allows precise rod placement while maintaining relative structural simplicity
4Ease of operation
If shorter rods are used to accommodate limited incision access, then insertion feasibility is improved, but spinal stabilization effectiveness is reduced
Solution Approach 1:
The extended guide tube provides an extended working dimension through the minimally invasive access point, allowing longer rods to be delivered and positioned correctly without requiring larger incisions. This dimensional extension reconciles insertion feasibility with stabilization effectiveness
Data Source
AI summary
Devices, systems, and methods for inserting a vertebral stabilization member, such as a rod. The insertion device includes an outer guide tube, a pin assembly including a pin and a pusher member extending therethrough. The insertion device is configured to actuate a rod between a first orientation and a second orientation angled with respect to the first orientation in order to position the rod in an appropriate location for attachment to bone.