Skin Interface Device for Cardiac Assist Wireless Power Transfer
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Solution Overview
Problem
Existing cardiac assist devices require inconvenient external apparatuses, such as compressed gas tanks and controllers, which limit portability and convenience.
Innovation Solution
The use of air as a pumping medium instead of helium, with a system that includes an arterial interface device and a skin interface device for controlling inflation and deflation cycles based on electrocardiogram data, eliminating the need for external tanks and compressors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If external apparatuses (compressed gas tanks and controllers) are used, then the cardiac assist device can operate, but portability and convenience are limited
Solution Approach 1:
The patent extracts the gas storage function from external tanks and integrates it into the implantable device by using the patient's own body cavity as the storage chamber. The pump is positioned within the pericardial cavity, eliminating the need for external compressed gas tanks and associated infrastructure.
Solution Approach 2:
The device uses the patient's body cavity as the storage chamber for the pumping medium, allowing the system to be self-sufficient. The body cavity serves as both the storage location and the operational environment, eliminating external support apparatuses.
2Weight of moving object
If external apparatuses are used, then the cardiac assist device can operate, but portability is reduced
Solution Approach 1:
The patent removes external gas tanks and controllers from the system architecture. The pump is implanted directly into the pericardial cavity with all necessary components integrated into the implantable device, making it portable and eliminating external apparatus requirements.
Solution Approach 2:
The patent combines multiple functions (pumping, gas storage, control) into a single integrated implantable device. The pump, storage chamber, and control electronics are merged into one unit implanted in the pericardial cavity, eliminating the need for separate external apparatuses.
3Duration of action of moving object
If compressed gas is used as pumping medium, then the pump can function, but frequent replacements are needed
Solution Approach 1:
The system uses the patient's body cavity as a self-replenishing storage chamber. The body cavity continuously provides the necessary space for the pumping medium without requiring external gas supplies or frequent refilling, enabling continuous operation.
Solution Approach 2:
The patent changes the storage parameter from external pressurized containers to the body cavity volume. This parameter change allows for continuous operation as the body cavity can accommodate the pumping medium without the limitations of external gas tanks.
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
This approach results in a more portable system that can continuously operate using ambient air, reducing the need for frequent replacements and improving the convenience of cardiac assist device operations.
Implementation Method 1
The pump typically comprises a displacement volume of 40-50 cc, and works in series with the heart to augment blood flow. During diastole, the pump is inflated, thereby driving blood in the ascending aorta and aortic arch into the coronary arteries
Implementation Method 2
The skin interface device (SID) comprises an implantable base and a SID cap. The SID is configured to wirelessly receive power from an external driver
Data Source
AI summary
A skin interface device (“SID”) for a cardiac assist device, including a SID cap having a first housing, an annular sleeve, and a first annular winding disposed over said annular sleeve. The SID further includes a SID base having a second housing formed to include a tubular portion, a cylindrical member disposed in said tubular portion, and a second annular winding disposed around said cylindrical member. The SID cap is configured to be rotationally attached to said SID base. When the SID cap is attached to the SID base, the second annular winding is disposed within the first annular winding, and the relative positions of the first annular winding and the second annular winding are fixed both laterally and vertically.