Coil Dilator Tip Structure for Easier Insertion and Removal
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Solution Overview
Problem
Conventional dilators face challenges in propulsion and removal performance in puncture holes or stenosed parts.
Innovation Solution
A medical instrument with a shaft and tip portion composed of a coil body made of multiple wires wound in a hollow spiral shape, where the first coil portion at the tip is formed by thinning out at least one wire, allowing for improved propulsion and removal performance by expanding or contracting the outer diameter through twisting force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a conventional tube structure is used for the dilator, then the structure is simple and easy to manufacture, but the propulsion performance and removal performance in puncture holes or stenosed parts are insufficient
Solution Approach 1:
The patent applies a coil body structure composed of multiple wires wound in a hollow spiral shape, replacing the conventional rigid tube structure. This flexible coil configuration allows the dilator to adapt to the puncture hole or stenosed part geometry, significantly improving propulsion performance through the tissue channel while maintaining ease of manufacture through standard coil winding processes.
Solution Approach 2:
The coil body structure enables dynamic adaptation during insertion and removal. The multiple wires can deform and flex to navigate through the puncture hole, and the spiral configuration allows for rotational movement that enhances propulsion. During removal, the coil can maintain engagement with the tissue wall to facilitate easy extraction, thus improving productivity without complicating manufacturing.
2Productivity
If the outer diameter of the tip portion is increased to improve propulsion performance, then the dilator can push open the inner wall more effectively, but the removal performance deteriorates due to increased friction and tissue engagement
Solution Approach 1:
The coil body structure allows dynamic change in outer diameter through rotational movement. During insertion, the coil can be configured to expand and push open the inner wall for effective propulsion. During removal, the coil can be rotated or compressed to reduce its outer diameter, minimizing friction and tissue engagement, thus facilitating easy removal. This dynamic adaptability resolves the contradiction between propulsion and removal performance.
Solution Approach 2:
The patent utilizes parameter changes in the coil body configuration, specifically the ability to alter the outer diameter through twisting or compressing the spiral structure. By changing the geometric parameters of the coil (tightening or loosening the spiral), the dilator can optimize its diameter for either propulsion or removal phases, effectively resolving the contradiction between these two operational requirements.
3Productivity
If the coil body is made with closely arranged multiple wires to act like a screw for propulsion, then the propulsion performance is improved, but the device complexity increases compared to a simple tube
Solution Approach 1:
The patent employs a coil body made of multiple wires wound in a hollow spiral shape, creating a flexible structure that acts like a screw during propulsion. This configuration improves propulsion performance by enabling the dilator to engage with and advance through the tissue wall effectively. Despite the increased structural complexity, the manufacturing process remains relatively simple using standard coil winding techniques, thus balancing performance improvement with acceptable device 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
Enhances propulsion and removal performance by widening or narrowing the gap between wires, facilitating insertion and extraction from puncture holes or stenosed parts.
Implementation Method 1
The coil body (multi-stranded coil) in which the multiple wires (wire materials) are closely arranged and wound acts like a screw on an inner wall (wall of an organ or the like) of the puncture hole or the stenosed part
Implementation Method 2
acts like a screw on an inner wall
Implementation Method 3
applying a twisting force in the insertion direction widens a gap between the wires at the tip portion and expands the outer diameter of the tip portion
Implementation Method 4
widens a gap between the wires at the tip portion and expands the outer diameter
Implementation Method 5
a part corresponding to the thinned wire forms a spiral groove, facilitating the bite of the inner wall of the puncture hole or the stenosed part into this spiral groove
Implementation Method 6
facilitating the bite of the inner wall into this spiral groove. This promotes the rotation of the tip portion
Data Source
AI summary
A medical instrument includes a shaft portion and a tip portion located at one end of the shaft portion and having an outer diameter that decreases in a direction away from the shaft portion. The shaft portion and the tip portion comprise a coil body including multiple wires wound in a hollow spiral shape. The coil body includes a first coil portion corresponding to the tip portion and a second coil portion corresponding to the shaft portion. The first coil portion is formed by thinning out at least one of the multiple wires.