Aortic Valve Cutter With Rotating Wire and Pusher Wires

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Solution Overview

Problem

Current treatments for aortic stenosis, such as surgical valve replacement, transcatheter valve replacement, and balloon aortic valvuloplasty, are invasive, costly, and may not be tolerable for all patients due to rapid ventricular pacing and temporary improvements.

Innovation Solution

An aortic valve cutter with a flexible housing, high-speed rotating wire, and pusher wires for stabilization and pressure monitoring, allowing for minimally invasive valve expansion without the need for extensive surgery.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If surgical valve replacement is performed, then the aortic valve can be replaced, but the patient faces major surgery risks

Engineering Contradiction:

Improvevalve replacement effectivenessVSAvoidsurgery risks

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent replaces the mechanical surgical approach with a transcatheter-based mechanical cutting system. A high-speed rotating wire delivered through a catheter cuts the aortic valve leaflets, eliminating the need for open heart surgery while achieving valve replacement效果

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The invention changes the physical state and parameters of the cutting wire through high-speed rotation to achieve cutting capability. The wire rotates at sufficient speed to cut through calcified valve tissue, transforming a non-cutting wire into an effective cutting tool

Inventive Principle:

Principle #35Parameter changes

2Ease of operation

If transcatheter valve replacement or balloon aortic valvuloplasty is performed, then the procedure is less invasive, but rapid ventricular pacing is required which may not be tolerable for some patients

Engineering Contradiction:

Improveprocedure invasivenessVSAvoidrapid ventricular pacing tolerance

Core Design Contradiction:

Ease of operationVSObject-affected harmful factors

Solution Approach 1:

The patent extracts and eliminates the requirement for rapid ventricular pacing from the transcatheter procedure. By using a mechanical cutting approach rather than balloon expansion, the invention removes the need for ventricular pacing, making the procedure tolerable for patients who cannot undergo rapid pacing

Inventive Principle:

Principle #2Taking out (Extraction)

3Productivity

If balloon aortic valvuloplasty is performed, then the aortic valve opening is increased, but the improvement typically lasts only a few months

Engineering Contradiction:

Improvevalve opening improvementVSAvoidimprovement duration

Core Design Contradiction:

ProductivityVSDuration of action of stationary object

Solution Approach 1:

The patent performs preliminary cutting of the aortic valve leaflets before valve replacement. By pre-cutting the calcified leaflets, the procedure creates permanent structural changes that enable long-term improvement rather than temporary balloon expansion effects

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The invention substitutes the temporary mechanical expansion of balloon valvuloplasty with permanent mechanical cutting of the valve leaflets. This structural modification provides durable results compared to the temporary effect of balloon inflation

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

4Manufacturing precision

If a high-speed rotating wire is used to cut the aortic valve, then the valve can be effectively cut, but the housing must be rigid enough to support the wire

Engineering Contradiction:

Improvevalve cutting precisionVSAvoidhousing structure complexity

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The patent uses a flexible catheter housing that can still support and guide the high-speed rotating wire. The flexible housing navigates through blood vessels while maintaining sufficient structural integrity to support the cutting wire, eliminating the need for complex rigid structures

Inventive Principle:

Principle #30Flexible shells and thin films

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 aortic valve cutter provides a safer, lower-cost procedure for expanding the aortic valve opening, potentially offering long-term improvements in blood flow without the risks associated with invasive surgeries.

Implementation Method 1

A high-speed rotating wire is disposed within the housing near an edge of the housing

Methodology Applied

Scientific EffectFriction: Friction

Implementation Method 2

the rotating wire can be used as a cutter

Methodology Applied

Scientific EffectAbrasion: Abrasion

Data Source

PatentUS9468458B2Aortic valve cutter

Publication Date: 2016.10.18 BONAPARTE MEDICAL INC

AI summary

An aortic valve cutter of the present disclosure has a flexible housing with a central lumen for receiving a guide wire. A high-speed rotating wire is disposed within the housing near an edge of the housing. A trough cut into a side of the housing exposes a portion of the rotating wire such that the rotating wire can be used as a cutter. Two pusher wires are disposed on an opposite side of the housing from the rotating wire. Troughs cut into the side of the housing form openings from which the pusher wires can extend. The pusher wires are staggered with respect to one another in the longitudinal direction. When the pusher wires are advanced, they extend outwardly from the troughs and can be used to stabilize the cutter at the aortic valve and push the cutting wire against the valve on the opposite side.