Surgical Wire Guide with Parallel Channels for Precise K-Wire Placement
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Solution Overview
Problem
Orthopedic surgeons lack adequate tools for accurately placing a second guide wire relative to a first wire in narrow bone spaces, particularly in wrist surgeries, due to the difficulty in maintaining precise alignment and small diameter of K-wires or drills, leading to suboptimal bone alignment and instability.
Innovation Solution
A device with parallel tunnels and a variable angle slot allows for precise placement of a second guide wire close to the first wire, enabling adjustments in small increments and angles, with a needle point for stabilization and radiolucency for imaging compatibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a first K-wire is inserted to align bones, then bone alignment is improved, but the ability to place a second K-wire in close proximity with precise alignment deteriorates due to limited space and small wire diameter
Solution Approach 1:
A guiding device is introduced as an intermediary tool between the surgeon and the K-wires. The guiding device includes a body with multiple guide channels arranged in specific patterns, where each channel guides a K-wire through a predetermined path. This intermediary device provides the precision needed for placing multiple wires in close proximity by mechanically constraining their positions relative to each other, solving the space limitation problem.
Solution Approach 2:
The guiding device is segmented into multiple independent guide channels within a single body structure. Each channel corresponds to a specific K-wire placement trajectory, allowing independent control and precise positioning of each wire. The segmentation enables multiple wires to be placed simultaneously or sequentially with exact spatial relationships predetermined by the channel geometry.
2Measurement precision
If a second K-wire is placed close to the first K-wire to correct alignment deficiencies, then alignment precision is improved, but the difficulty of maintaining precise alignment in narrow spaces increases
Solution Approach 1:
The guide channels are pre-formed within the guiding device body before surgery. Each channel is designed with specific dimensions and orientations that predetermined the exact path and position of K-wires. By following these pre-formed channels, the surgeon can easily insert wires with high precision without having to manually maintain complex spatial relationships during insertion, significantly improving ease of operation.
Solution Approach 2:
The guiding device acts as a mediator that translates the surgeon's insertion force into precise wire placement. The guide channels provide mechanical guidance that automatically maintains correct wire orientation and position, eliminating the need for the surgeon to manually control complex alignment parameters while inserting wires in narrow spaces.
3Manufacturing precision
If K-wires with small diameter are used for bone fixation, then bone alignment precision is improved, but the visibility and controllability of wire position deteriorates due to limited detection capability
Solution Approach 1:
The guiding device incorporates radiopaque markers or contrasting elements that change the radiographic appearance. These markers appear as distinct radiopaque structures on X-rays, making the wire paths and guide channels visible despite the small diameter of the K-wires. This allows real-time visualization and detection of wire positions during surgery, solving the detection difficulty.
Solution Approach 2:
The guiding device serves as a radiopaque intermediary structure that makes the invisible small-diameter wires visible. The guide channels and associated structures provide a larger, detectable framework that outlines the wire paths on imaging, allowing the surgeon to detect and measure wire positions accurately even when the wires themselves are too thin to be directly visualized.
Data Source
AI summary
A method and device for improving the placement of a second guide wire in relation to a first guide wire. A body having a first guide wire channel extends from a proximal end to a distal end. The distal end includes a needle-like tip arranged to receive a first guide wire from the first guide wire channel. The body further includes at least one parallel guide wire conduit in close proximity and substantially parallel to the channel. An elongated slot, with a wide opening on the distal end, narrows at the proximal end with a terminus exiting the body in close proximity to the needle-like tip. A second guide wire can be selectively inserted in either the at least one parallel conduit or in the slot to arrange the second guide wire in close and parallel proximity to, or in close and intersecting the trajectory of, the first guide wire.