Collapsible Hemodynamic Device Minimally Invasive Implantation
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Solution Overview
Problem
Current ventricular assist devices (VADs) for chronic heart failure (CHF) interfere with heart function and reduce the likelihood of cardiac recovery, as they require opening the left ventricle during implantation, causing stress and limiting recovery possibilities due to the scarcity of transplantable hearts.
Innovation Solution
A collapsible hemodynamic assist device with a rotary mover and transformable blade member that can be implanted in a minimally invasive procedure without damaging the heart, using a sheath to retain the blade in a collapsed configuration and expand within the aorta, allowing for blood flow assistance without interfering with cardiac function.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a VAD is implanted to assist blood flow in CHF patients, then blood flow assistance is improved, but cardiac recovery likelihood deteriorates due to heart damage and interference with ventricle operation
Solution Approach 1:
The device separates the blood flow assistance function from the heart structure itself. The collapsible blade member operates independently within the aorta without being attached to or interfering with the left ventricle, allowing the heart to continue its natural pumping action while receiving hemodynamic support.
Solution Approach 2:
The device introduces an intermediary mechanism (the collapsible blade member in the aorta) that provides blood flow assistance without directly interacting with the heart. This intermediary approach allows the heart to function naturally while still achieving the desired hemodynamic support.
2Productivity
If a VAD is implanted to provide hemodynamic support, then blood flow assistance is improved, but device complexity increases due to required heart opening and attachment procedures
Solution Approach 1:
The collapsible blade member is nested within a delivery catheter during implantation. The blade member is compressed into a compact configuration that fits inside the catheter, allowing percutaneous insertion without open heart surgery. Once in position, the blade member expands to its functional configuration.
Solution Approach 2:
The blade member transitions from a collapsed state during implantation to an expanded state during operation. This dynamic transformation allows the device to be inserted through a minimally invasive procedure while maintaining the structural integrity and pumping capability needed for hemodynamic support.
3Productivity
If a VAD is implanted to assist blood flow, then blood flow assistance is improved, but ease of removal deteriorates due to permanent implantation requirements
Solution Approach 1:
The blade member's collapsible design allows it to be easily compressed back into its delivery catheter for removal. The same dynamic transformation mechanism that facilitated minimally invasive implantation now enables simple retrieval by collapsing the blade member and withdrawing it through the access site.
Solution Approach 2:
The device includes self-contained control mechanisms that allow for easy activation and deactivation of the blade member's pumping function. The controller can stop rotating the blade member, and the collapsible design allows it to be easily withdrawn, providing ease of removal without complex disassembly procedures.
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
Enables blood flow assistance while minimizing heart stress, potentially enhancing cardiac recovery chances and reducing the need for heart transplants by allowing for minimally invasive implantation and retrieval of the device without damaging the heart.
Implementation Method 1
a rotary mover coupled to the shaft adjacent the first end. The device also includes a collapsible blade member selectively rotatable by the rotary mover about the axis A-A
Data Source
AI summary
An improved hemodynamic device may be collapsed and implanted percutaneously. The device includes at least one collapsible blade member and a rotary mover for rotating the blade member to provide hemodynamic circulation. In one embodiment of the invention, the blade member rotates within a basket after implantation. The basket may be formed of shape-memory wires.