Catheter Pump Motor Speed Control via IABP Pressure
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Solution Overview
Problem
Current catheter pump systems for providing pulsatile cardiac support are complex and unreliable, particularly in synchronizing blood flow with heart pulsations to enhance cardiac output and reduce left ventricular workload.
Innovation Solution
A catheter pump system that integrates an intra-aortic balloon pump (IABP) with a motor controller connected to the IABP driver's pressure sensing port, using a pneumatic motor and variable restriction valve to control pump speed in sync with heart pulsations, ensuring reliable and simple pulsatile operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a catheter pump system is designed to provide pulsatile cardiac support with synchronization to heart beats, then cardiac output is improved and left ventricular workload is reduced, but the system complexity increases and reliability decreases
Solution Approach 1:
The patent combines the IABP driver's pressure sensing capability with the motor controller's speed control function by connecting the pressure sensing port to the IABP driver output. This merging allows the motor speed to be automatically synchronized with heart pulsations without requiring separate sensing and control systems, thereby improving cardiac output while reducing system complexity
Solution Approach 2:
The system uses the existing IABP driver's pressure output to automatically control the motor speed of the catheter pump. The pressure variations from heart pulsations directly modulate the motor speed without requiring external control signals or complex synchronization algorithms, enabling self-service operation that improves reliability while maintaining simplicity
2Manufacturing precision
If motor speed control is achieved through complex control systems, then precise pulsatile operation is improved, but reliability and simplicity are worsened
Solution Approach 1:
The system establishes a feedback loop where the IABP driver's pressure sensing port detects pressure variations caused by heart pulsations and automatically adjusts the motor controller's output. This feedback mechanism ensures precise pulsatile operation synchronized with the cardiac cycle while maintaining system reliability through passive, automatic control rather than complex active control systems
Data Source
AI summary
A catheter pump system with a pump having a fluid displacement member in the blood flow channel, a motor and a motor controller having a pressure sensing port for connection to a control pressure source. The motor controller is arranged for causing motor speed to be increased in response to a reduction of pressure applied to the pressure sensing port and for causing motor speed to be reduced in response to an increase of pressure applied to the pressure sensing port. The motor may be a pneumatic motor for driving the pump and the motor controller may be arranged for controlling motor speed by reducing flow through a supply channel to the motor and allowing an increase of flow through the supply channel to the motor in response to control signals received via an input interface.