Pedicle Screw Locking Bolt Groove Design
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Solution Overview
Problem
Conventional pedicle screws face inefficiencies due to the need for a separate guide tool to align and secure the rod, leading to potential interference and delays in surgical operations, as the fixation cap can be released, causing instability and increased operation time.
Innovation Solution
A pedicle screw design featuring a screw body with a seat groove and female threaded portion, and a locking bolt with a male threaded portion and spiral groove, allowing for secure engagement without a cap, using an inversed-trapezoidal cross-section to prevent the locking bolt from being released, thus reducing interference and operation time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixation cap is used to prevent rod interference, then the rod can be securely fixed, but the surgical operation time increases due to additional steps and potential cap release
Solution Approach 1:
The invention removes the fixation cap from the system by integrating its function directly into the locking bolt structure. The groove on the locking bolt performs the retention function that previously required a separate cap, eliminating the cap release issue and reducing surgical steps.
Solution Approach 2:
The invention merges the locking bolt and fixation cap functions into a single integrated component. The locking bolt with its groove structure combines both the locking mechanism and the rod retention function, eliminating the need for separate cap installation and removal steps.
2Measurement precision
If a separate guide tool is used to align the rod, then the rod can be precisely positioned, but the device complexity increases and operation time increases
Solution Approach 1:
The invention combines the alignment guide function with the locking bolt structure itself. The groove on the locking bolt serves as both the alignment guide and the final locking mechanism, eliminating the need for a separate guide tool while maintaining precision.
Solution Approach 2:
The locking bolt structure performs its own alignment function through the groove feature, eliminating the need for external guide tools. The component itself provides the alignment guidance during installation.
3Reliability
If the threaded portion is pressed in the fastening direction, then the locking bolt is securely fastened, but the structure becomes more complex
Solution Approach 1:
The invention segments the locking bolt structure by adding a separate groove feature that works in conjunction with the threaded portion. This segmentation allows the threaded portion to be pressed in the fastening direction while the groove provides additional retention, achieving reliable fastening without excessive complexity.
Data Source
AI summary
Disclosed is a pedicle screw. By changing the structure of a threaded portion of a locking bolt engaged with a head of the pedicle screw and forming a groove on the locking bolt, the threaded portion is pressed in a fastening direction of the locking bolt, so that when a head of the pedicle screw is fastened to the locking bolt, a fixation cap is not released by the force applied from the head expanding towards an outside, and thus the locking bolt is easily fastened to the head of a screw body, thereby improving an inefficiency factor such as delay of surgical operation time due to release or interference of the fixation cap.