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Publication Number
US-10478550-B2
Publication Date
2019-11-19
Expiration Date
Abstract
In a device for ambulatory wearing by the patient containing a pump for delivery of injection fluid or for removal of analysis fluid, the drive motor for the mechanically driven pump system is a Lavet-type stepper motor of small size designed for having a high mechanical power and low peak current requirement. Using this Lavet-type motor for syringe-type or peristaltic preferably patch-type pumps high infusion rates needed for e.g. bolus insulin injection or the delivery of therapeutic antibodies are achieved, and important safety features can be easily and reliably controlled, manufacturing costs get significantly reduced, and the overall size and weight of the device becomes smaller, for patient convenience.
Core Innovation
The invention describes an ambulatory device for wearing by a patient that delivers injection fluid using a pump system and a Lavet-type stepper motor. The stepper motor includes a rotor with a magnet made of high energy density magnetic material, which is a magnetic alloy including a rare earth element. Therapeutic proteins such as insulin or antibodies are explicitly included as the injection fluid.
The device establishes step-success versus step-failure detection based on generator behavior of the Lavet-type stepper motor. When the stepper motor successfully performs a step, there is an induced current of opposite polarity with respect to an applied voltage pulse, whereas when the stepper motor does not successfully perform the step, the induced current is of the same polarity with respect to the applied voltage pulse.
The maximum speed and the maximum torque are restricted by a design of the stepper motor. By combining restricted maximum speed and torque with induced-current polarity analysis, the device aims to control and monitor delivery performance of the pump system driven by the Lavet-type stepper motor.
Claims Coverage
The provided claim set includes two independent claims, both focused on an ambulatory pump device driven by a Lavet-type stepper motor, with motor step success monitored using induced current polarity, and with step-related control based on analyzing motor current and/or voltage in the second independent claim.
Ambulatory wearable pump driven by Lavet-type stepper motor with rare-earth magnet rotor
A device for ambulatory wearing by a patient comprising a pump for delivery of injection fluid including a pump system with a fluid reservoirs, and a Lavet-type stepper motor to drive the pump system, the stepper motor including a rotor with a magnet made of high energy density magnetic material which is a magnetic alloy including a rare earth element, wherein the injection fluid includes therapeutic proteins like insulin or antibodies.
Induced current polarity indicating successful versus unsuccessful motor step
When the stepper motor successfully performs a step, there is an induced current of opposite polarity with respect to applied voltage pulse, and when the stepper motor does not successfully perform the step, there is an induced current that is of a same polarity with respect to the applied voltage pulse.
Design-restricted maximum speed and maximum torque
A maximum speed of the stepper motor is restricted by a design of the stepper motor, and a maximum torque of the stepper motor is restricted by a design of the stepper motor.
Operation control analyzing motor current and/or voltage to control motor steps
An operation control component having an element analyzing motor current and/or voltage to control the motor steps.
Across the independent claims, the coverage centers on driving an ambulatory pump delivering therapeutic proteins with a Lavet-type stepper motor that has a rare-earth magnetic alloy rotor magnet, using induced-current polarity relative to an applied voltage pulse to indicate successful versus unsuccessful stepping, restricting maximum speed and torque by motor design, and controlling motor steps by analyzing motor current and/or motor voltage.
Stated Advantages
Documented Applications
No documented applications found
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