Spiral Dilator Covering Layer Suppresses Displacement
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Solution Overview
Problem
Dilators face challenges in achieving sufficient propulsive force at the tapered portion, leading to incomplete hole expansion due to increased pushing resistance, and the spirally-arranged protruding portion may displace in the lengthwise axis direction, hindering effective expansion.
Innovation Solution
A dilator design featuring a hollow shaft with a spirally-arranged protruding portion and a covering layer that covers the outer peripheral surface, preventing displacement and enhancing screw action for effective expansion, while minimizing tissue pinching and abrasion resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a coil is wound around the outer periphery of the dilator to form a spirally-arranged protruding portion, then propulsive force is improved through screw effect, but the protruding portion becomes displaced in the lengthwise axis direction
Solution Approach 1:
A covering layer is introduced as an intermediary component that covers the outer peripheral surface of the dilator in the gaps between adjacent parts of the protruding portion. This covering layer prevents the protruding portion from displacing in the lengthwise axis direction while allowing the screw effect to function effectively for generating propulsive force.
Solution Approach 2:
The covering layer functions as a thin film structure that conforms to the outer periphery of the dilator. It provides constraint and stability to the spirally-arranged protruding portion, preventing unwanted displacement while maintaining the flexibility needed for the dilator to expand the hole effectively.
2Productivity
If the protruding portion extends in a spiral to enhance propulsive force, then hole expansion capability is improved, but tissue pinching and abrasion increase during rotation
Solution Approach 1:
The covering layer acts as a protective thin film that covers the outer peripheral surface where the protruding portion is located. It reduces direct contact between the protruding portion and the tissue, thereby minimizing tissue pinching and abrasion while allowing the spiral structure to perform its hole expansion function.
Solution Approach 2:
The dilator employs a composite structure combining the protruding portion (for mechanical expansion) and the covering layer (for tissue protection). This composite design allows the protruding portion to maintain its spiral configuration for effective hole expansion while the covering layer mitigates harmful effects on the surrounding tissue.
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
The design effectively suppresses displacement of the spirally-arranged protruding portion, ensuring consistent and complete hole expansion with improved resistance to tissue pinching and abrasion during rotation.
Implementation Method 1
The distal end of the dilator is inserted into the hole formed on the wall, and the hole is expanded by pushing a tapered portion into the hole
Implementation Method 2
a spirally-arranged protruding portion is formed by winding a coil around the outer periphery of the dilator, and the dilator is advanced by ensuring a propulsive force is obtained due to a screw effect caused by rotation
Data Source
Figure 1~2
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Figure 5~7
AI summary
Provided is a dilator that can suppress displacement, in a lengthwise axis direction, of a protruding portion that extends in a spiral. The dilator comprises: a first coil 2 having an outer diameter that increases from a distal end toward a proximal end; and a protruding portion 3A that is provided on the outer periphery of the first coil 2, and extends along the outer periphery of the first coil 2 in a spiral along a lengthwise axis direction of the first coil 2. The protruding portion 3A has gaps 3B between adjacent parts of the protruding portion 3A along the lengthwise axis direction. A covering layer 5 is provided that covers at least an outer peripheral surface 2A of the first coil 2, said outer peripheral surface 2A being located in the gaps 3B. A top portion 3D of the protruding portion 3A is exposed.