Adjustable Percutaneous Targeting Device for Parallel Screw Placement
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Solution Overview
Problem
The existing chevron osteotomy procedure for correcting hallux valgus deformity requires multiple X-ray images for correct screw placement, leading to increased radiation exposure and costs.
Innovation Solution
A percutaneous targeting device with a target guide and guide pins for precise screw placement, ensuring screws are in a plane with the target pin, allowing for parallel insertion and preventing oblique screws that weaken bone material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple X-ray images are used for correct screw placement, then screw placement accuracy is improved, but radiation exposure and costs increase
Solution Approach 1:
The patent introduces a mechanical guide device as an intermediary tool that provides physical guidance for screw insertion. The guide device includes a guide body with a guide channel that directs the screw along a predetermined trajectory, eliminating the need for multiple X-ray images to verify placement accuracy. This mechanical intermediary translates the desired screw path into physical constraints that ensure accurate placement without radiation exposure.
Solution Approach 2:
The guide device is designed and positioned before screw insertion, establishing the correct screw trajectory in advance. The guide channel is pre-configured with the appropriate angle and direction for the specific osteotomy procedure, allowing the surgeon to simply follow the pre-determined path without needing to take multiple X-ray images during the procedure to verify placement.
2Measurement precision
If multiple X-ray images are taken for screw placement verification, then placement precision is improved, but surgical time is increased
Solution Approach 1:
The guide device establishes the correct screw trajectory before the actual screw insertion. By pre-configuring the guide channel with the precise angle and direction needed for the specific patient anatomy and osteotomy type, the device eliminates the need for time-consuming X-ray verification steps during surgery. The surgeon simply follows the pre-determined path provided by the guide.
Solution Approach 2:
The mechanical guide acts as an intermediary that provides real-time physical feedback and constraint during screw insertion. The guide channel physically prevents deviation from the correct trajectory, allowing the surgeon to insert the screw with confidence without needing to pause for X-ray verification, thus significantly reducing surgical time while maintaining high placement accuracy.
3Adaptability or versatility
If guide pins are inserted at different angles, then adaptability to different anatomical needs is improved, but parallelism and bone strength are compromised
Solution Approach 1:
The guide device incorporates adjustable components that allow the guide pins to be dynamically positioned at different angles relative to each other while maintaining their parallelism. The extension can be rotated or adjusted to change the angular relationship between guide pins, accommodating different anatomical variations and surgical requirements. This dynamic adjustability ensures that guide pins remain parallel to each other even when inserted at different orientations, preserving bone structural integrity while providing the needed adaptability.
Solution Approach 2:
The guide device is divided into separate modular components including a guide body and an adjustable extension. This segmentation allows the extension to be independently positioned and angled relative to the guide body, enabling the surgeon to adapt the guide pin angles to specific anatomical needs while ensuring that the guide pins themselves remain parallel. The modular design provides flexibility without compromising the parallelism required for bone strength.
Data Source
AI summary
A percutaneous targeting device comprises a body holding an extension. The body has a target guide holding a target pin which may be a K-wire. The extension has two guide sleeves, holding a guide wire. All wires are held in a common plane. The guide wires serve as a guide for cannulated fixation screws. The extension is movable against the body to adjust the angle between the target pin and the guide wires.