JPWO2020002386A5 - - Google Patents

Claims (13)

It ’s an electric motor.
With a stator including electrical windings,
It has a rotor magnetically coupled to the stator and has
The electric motor does not contain a ferromagnetic material and
The electric motor does not include permanent magnets and
The rotor includes an outer rotor cylinder that surrounds the stator.
Electric motor. The electric motor of claim 1 , wherein the rotor further comprises an inner rotor cylinder arranged inside the stator and connected to rotate with the outer rotor cylinder. The electric motor according to claim 1 or 2 , wherein the electric motor is an induction motor, and the outer rotor cylinder includes a cylindrical seat rotor. The rotor comprises one or more conductive loops, each shaped such that the induced voltage in one half loop cancels out the effect of the induced voltage in the other half loop.
The stator includes a first stator magnetically coupled to the one half-loop and a second stator magnetically coupled to the other half-loop, the first and second stators. The electric motor according to claim 1 or 2, wherein is electrically driven with a phase difference of 180 degrees. The electric motor according to claim 4 , further comprising a rectifier brush operably coupled to each conductive loop. The electric motor according to any one of claims 1 to 5 , wherein the electric winding of the stator is wound so as to form the stator as a three-phase stator. The electric motor according to any one of claims 1 to 6 , further comprising a fixed frequency motor driver that operates to electrically power the stator at a fixed electrical frequency. It ’s an injection pump.
The electric motor according to any one of claims 1 to 7 .
Fluid delivery comprising (i) a syringe receptacle and (ii) a fluid pump having an inlet configured to connect to an infusion fluid source and an outlet configured to connect to a patient infusion delivery accessory. Has elements and
An infusion pump to which the electric motor is connected to actuate the fluid delivery element by driving the plunger of the associated syringe attached to the syringe receptacle or by actuating the fluid pump. In the method of operating a medical device
Steps to operably connect the medical device to the patient,
It has a step of activating an electric motor to drive the medical device to provide treatment to the patient.
The electric motor includes a stator with an electric winding and a rotor.
The electric motor does not contain a ferromagnetic material, does not contain a permanent magnet ,
The method further comprises the step of using the rotor to provide an electromagnetic shield for the stator while the electric motor is in operation.
Method. Further steps are taken using a magnetic resonance imaging (MRI) device to acquire an MRI image of a patient and at the same time actuating the electric motor to apply driving force to the medical device to provide treatment to the patient. The method according to claim 9 . When the MRI image of the patient is not acquired, the driving force is applied to the medical device to provide treatment to the patient with the electric motor placed outside any magnetic field generated by the MRI device. 10. The method of claim 10 , further comprising a step of repeating the operation of the electric motor. The method of any one of claims 9-11 , wherein the medical device is an infusion pump and the electric motor is actuated to apply pump force to deliver the infusion fluid to the patient. .. The method according to any one of claims 9 to 12 , wherein the step of operating the electric motor includes a step of operating the induction motor at a fixed electric frequency.