Implantable Blood Pump Motor Startup With Adaptive Ramp Control
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Solution Overview
Problem
Implantable blood pumps face challenges in efficiently starting operation, particularly when the rotor is at rest, as rapid speed ramping can cause phase commutation errors and suction conditions, leading to inadequate blood flow and potential overheating of control electronics.
Innovation Solution
A processor-controlled system that adjusts operational parameters for the motor of an implantable blood pump, including default parameters for startup, error detection, and parameter adjustment based on detected errors, to ensure safe and efficient startup and operation, such as ramping speed and phase locking, while monitoring flow rate and pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the pump speed is increased quickly to provide rapid circulatory assistance, then the productivity is improved, but phase commutation errors occur and suction conditions are created
Solution Approach 1:
The control system dynamically adjusts the startup parameters based on real-time feedback from sensors monitoring pump performance and motor operation. The ramp rate is not fixed but adapts during the startup sequence to optimize both speed and reliability.
Solution Approach 2:
Sensors monitor pump operation and provide feedback to the control system, which adjusts the ramp rate and other parameters in real-time. This closed-loop control prevents commutation errors and suction conditions by detecting early signs of these problems and correcting the startup profile.
2Productivity
If the pump speed is increased quickly to provide rapid circulatory assistance, then the productivity is improved, but suction conditions are created causing flow rate to decline
Solution Approach 1:
The control system performs preliminary actions during startup by gradually ramping up the pump speed through controlled stages. This preliminary gradual acceleration prevents the sudden pressure changes that cause suction conditions and ventricle collapse before normal operation begins.
Solution Approach 2:
The ramp rate is dynamically adjusted based on real-time feedback from sensors monitoring pump performance and motor operation, optimizing both speed and reliability while preventing harmful suction conditions.
3Speed
If too much power is supplied too quickly to start the pump, then the startup speed is improved, but control electronics overheat and may trigger a cutoff
Solution Approach 1:
The power delivery is structured as periodic staged ramping rather than continuous maximum power application. The control system applies power in controlled increments with monitoring intervals, allowing heat dissipation while achieving necessary startup speed.
Solution Approach 2:
The power delivery profile is dynamically adjusted based on real-time feedback from sensors monitoring pump performance and motor operation, optimizing startup speed while preventing overheating of control electronics.
Data Source
AI summary
An apparatus for starting operation of a motor of an implantable blood pump including a memory storing one or more default parameters for at least one of controlling and monitoring the startup operation. A processor operatively coupled to the motor is included, the processor is configured to: commence the startup operation based on the one or more default parameters; detect an error during the startup operation; adjust at least one of the one or more default parameters in response to the detected error; store the at least one adjusted parameter in the memory; and commence subsequent startup operations based at least in part on the at least one adjusted parameter.