Pedicle Screw Extension Wing Layout for Smaller MIS Incisions
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Solution Overview
Problem
Conventional minimally invasive spinal surgery requires large incisions due to the cylindrical shape of pedicle screw extension components, which interferes with adjacent screws, making it difficult to minimize wound size and surgical trauma.
Innovation Solution
A minimally invasive surgical screw device with a positioning element and a flexible extension wing, featuring a limiting portion and expanding portion, allows for a smaller surgical incision by using a flexible extension wing that retracts muscle and skin tissues, reducing the space occupied by the surgical path.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional cylindrical extension components are used in pedicle screws, then the surgical incision must be large enough to prevent interference between adjacent screws, but this results in large wound size and significant tissue damage
Solution Approach 1:
The extension component is divided into multiple planar extensions (first extension, second extension, third extension, fourth extension) arranged in different planes rather than a single cylindrical structure. This segmentation allows each extension to occupy different spatial orientations, preventing interference between adjacent screws while reducing the overall wound size required for implantation.
Solution Approach 2:
The extension components are arranged in multiple planes (first plane, second plane, third plane, fourth plane) rather than extending in a single dimension. This multi-planar arrangement allows the extensions to utilize three-dimensional space more efficiently, preventing interference between adjacent screws without requiring a large incision width.
2Ease of operation
If cylindrical extension components are used, then adequate surgical field access is ensured, but the incision width must be at least 5 cm which defeats the purpose of minimally invasive surgery
Solution Approach 1:
The extension component is segmented into multiple planar extensions that can be independently positioned and configured. This segmentation allows the surgical field to be accessed through a smaller incision while maintaining adequate working space for surgical instruments, as each extension occupies a different plane rather than requiring a large circular opening.
Solution Approach 2:
The extension components are designed as thin planar structures rather than bulky cylindrical forms. These thin-film-like extensions provide sufficient structural support and surgical access while occupying minimal space, enabling minimally invasive implantation through smaller incisions.
3Ease of manufacture
If large incisions are made to accommodate cylindrical extensions, then proper installation of pedicle screws is facilitated, but this causes delayed wound healing due to destruction of anatomical structures
Solution Approach 1:
The segmented planar extension design allows for easier and more precise installation through smaller incisions. Each planar extension can be independently positioned and secured, simplifying the installation process while minimizing tissue disruption and promoting faster wound healing compared to large cylindrical extensions.
Solution Approach 2:
The extension component is constructed from biocompatible materials that combine structural strength with flexibility, allowing for easy installation through minimal incisions while promoting tissue compatibility and faster healing. The material composition enables the extensions to provide adequate support without requiring large access wounds.
Data Source
AI summary
A MIS screw device is provided. The MIS screw device includes: a screw element; a positioning element having a limiting portion for receiving the screw element and an expanding portion connected to the limiting portion; and a flexible extension wing having two opposing first sections respectively coupled to opposite positions of the positioning element, wherein the two first sections extend in a direction parallel to a longitudinal direction of the positioning element. Thereby, by using the MIS screw device of the present disclosure, pedicle screws implantation can be performed while minimizing the wound area at the surgical site and reducing the space occupied by the surgical path from the skin to the subcutaneous tissue.