Pedicle Screw Receiver Holder with Sliding Wedges
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Solution Overview
Problem
Conventional pedicle screw assemblies for spinal fixation lack an efficient and minimally invasive method for holding and inserting receiver elements, which complicates surgical procedures and stability during minimally invasive surgeries.
Innovation Solution
A device comprising a holder with sliding wedges, retention pins, and a lock/unlock mechanism that allows for the secure holding and percutaneous insertion of receiver elements, utilizing a compression spring and wedges to open and close blades for easy release and attachment, facilitating multi-axial positioning and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional pedicle screw assemblies are used for spinal fixation, then spinal fixation can be achieved, but the surgical procedure becomes complex and stability during minimally invasive surgery is compromised
Solution Approach 1:
The device is divided into separate functional components: a holder portion for positioning the receiver element, insertion elements for percutaneous insertion, and retention pins for securing the receiver element. This segmentation allows each component to perform its specific function efficiently, simplifying the overall surgical procedure while maintaining stability during minimally invasive surgery.
Solution Approach 2:
The holder acts as an intermediary tool between the surgeon and the receiver element, providing precise control and positioning during insertion. The holder portion with its retention pins serves as a mediator that secures the receiver element in place, enabling stable fixation while simplifying the surgical technique.
2Productivity
If receiver elements are inserted using conventional methods, then spinal fixation can be achieved, but insertion and removal become time-consuming and less efficient
Solution Approach 1:
The holder is pre-configured with retention pins and guiding structures that automatically align and secure the receiver element during insertion. The percutaneous insertion elements are pre-positioned to facilitate rapid insertion through the skin, eliminating time-consuming alignment and securing steps while ensuring proper positioning.
Solution Approach 2:
The device incorporates dynamic retention mechanisms where the retention pins can be easily inserted and removed from the holder, and the percutaneous insertion elements can be quickly engaged and disengaged. This dynamic design allows for rapid insertion and removal operations while maintaining secure fixation during the surgical procedure.
3Measurement precision
If multi-axial positioning is achieved, then surgical precision is improved, but the device structure becomes more complex
Solution Approach 1:
The holder incorporates localized positioning features such as retention pins with specific geometric shapes and percutaneous insertion elements with oriented grooves that enable multi-axial positioning. These local quality features provide precise control in specific directions without requiring complex overall device structure, achieving surgical precision through targeted design elements.
Solution Approach 2:
The device achieves multi-axial positioning by adding dimensional freedom through the holder's retention pins and percutaneous insertion elements that can engage in multiple orientations. The holder portion provides positioning in one dimension while the percutaneous elements add positioning capability in additional dimensions, achieving comprehensive multi-axial control without excessive structural complexity.
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 secure and efficient insertion and removal of receiver elements, enhancing surgical precision and stability during minimally invasive spinal fixation procedures, while allowing for precise multi-axial positioning and reduced surgical complexity.
Implementation Method 1
utilizing a compression spring and wedges to open and close blades for easy release and attachment
Implementation Method 2
sliding wedges... utilizing a compression spring and wedges to open and close blades
Data Source
AI summary
The present invention relates to a device (and corresponding method) for holding and inserting one or more components of a pedicle screw assembly. In one example (which example is intended to be illustrative and not restrictive), the present invention may be used in connection with minimally invasive surgery.