Spring Cage Spinal Fixation Locking Mechanism
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Solution Overview
Problem
Existing spinal fixation systems face challenges in securely locking pedicle screws in place, particularly in maintaining angular and rotational stability, and preventing screw backout.
Innovation Solution
The proposed spinal fixation system incorporates a connector body with a spring cage structure that expands to receive the head of a pedicle screw, locking it in place through a combination of a tulip connector and a saddle element, which engages a spinal fixation rod.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a traditional rigid connector is used to secure pedicle screws, then structural strength is improved, but adaptability for angular positioning is worsened
Solution Approach 1:
The connector body incorporates a spring cage structure that transitions from a rigid state during installation to a flexible state for angular adjustment. The spring elements allow the connector to dynamically adapt its angle relative to the pedicle screw while maintaining secure engagement, resolving the contradiction between structural strength and angular positioning adaptability.
2Reliability
If a secure locking mechanism is implemented to prevent screw backout, then reliability is improved, but device complexity is worsened
Solution Approach 1:
The spring cage structure functions as a self-locking mechanism where the spring elements naturally engage with the pedicle screw head and maintain constant contact pressure. This self-service locking action prevents screw backout without requiring additional complex locking components, thus improving reliability while minimizing device complexity.
3Reliability
If the spring cage structure is designed to fully enclose the screw head, then screw retention is improved, but ease of insertion is worsened
Solution Approach 1:
The spring cage structure is designed to be flexible during insertion, allowing the spring elements to compress and accommodate the screw head as it is being inserted. Once the screw is in place, the springs expand to fully enclose and secure the screw head. This dynamic behavior resolves the contradiction between screw retention and insertion ease.
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
This solution effectively secures pedicle screws, prevents backout, and allows for adjustable angular positioning of the screws relative to the connector body, enhancing the stability and efficacy of spinal fixation.
Implementation Method 1
a spring element configured to be positioned in a relaxed configuration and a flexed configuration. The spring may be configured to define an opening having a first size in the relaxed configuration and to expand such that the opening has a second, larger size in the flexed configuration
Data Source
AI summary
Systems, methods and devices are disclosed for facilitating assembly and use of spinal fixation apparatus, including a helical cage structure for selective engaging and/or securing an engagement member or surgical screw in a spinal fixation system.