Atherectomy Device with Segmented Guide Wire Lumen
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Solution Overview
Problem
Existing atherectomy devices face challenges in efficiently cutting mixed lesions with both soft and hard tissues, and often damage guide wires due to their over-the-wire structure, which complicates the protection of the guide wire during treatment.
Innovation Solution
A medical device featuring a sheath with a rotatable hollow rotating body having a corrugated distal surface and a guide wire lumen on its outer surface, allowing for efficient cutting of mixed lesions without direct contact between the guide wire and the rotating body, thereby preventing damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the guide wire is inserted into the rotor unit (over-the-wire structure), then the device can be delivered through the catheter, but the guide wire is likely to come into contact with the rotor unit during treatment, increasing the possibility of damage
Solution Approach 1:
The device is divided into two separate lumens: a guide wire lumen for the guide wire and a rotor lumen for the rotor unit. This segmentation allows the guide wire and rotor to operate independently without contact, eliminating the risk of guide wire damage while maintaining deliverability through the catheter.
Solution Approach 2:
The sheath acts as an intermediary structure that houses both the guide wire lumen and rotor lumen separately. By providing distinct pathways within the sheath, the guide wire is protected from contact with the rotor unit while both components can be delivered and operated effectively.
2Productivity
If the rotating body has a structure optimized for one tissue type, then it can effectively cut that specific tissue, but it becomes difficult to smoothly cut mixed lesions containing both soft and hard tissues
Solution Approach 1:
The distal surface of the rotating body features localized corrugated portions with varying geometries. These different local structures are optimized for cutting different tissue types (soft vs. hard), allowing the single rotating body to effectively handle mixed lesions by engaging the appropriate surface features depending on the tissue encountered.
Solution Approach 2:
The rotating body incorporates a composite surface structure combining smooth regions and corrugated regions with different geometries. This composite design allows the rotating body to adapt to different tissue properties, effectively cutting both soft and hard tissues within mixed lesions.
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 device effectively cuts mixed lesions with high efficiency and prevents guide wire damage by maintaining the guide wire's integrity during treatment, reducing the risk of penetration through the blood vessel wall.
Implementation Method 1
a distal surface of the rotating body has a corrugated portion
Implementation Method 2
a distal surface of the rotating body has a corrugated portion
Data Source
AI summary
A medical device is disclosed that can help prevent a guide wire from coming into contact with a rotating body in the middle of performing a treatment and achieves improvement in the efficiency of cutting an object by the rotating body. The medical device has a sheath that is insertable into a body lumen, a rotatable hollow rotating body that is disposed to protrude toward a distal side of the sheath, and guide wire lumens into which a guide wire is insertable in parallel with the sheath. A distal end surface of the rotating body has a concave-convex cut portion formed only between an inner distal end of the hollow rotating body and an outer periphery of the distal end of the hollow rotating body.