Non-magnetic medical infusion device
First Claim
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1. An IV infusion delivery apparatus capable of operating in an MRI environment, the apparatus comprising:
- a pump disposed to receive a liquid conduit and to transfer IV liquid through the liquid conduit from a liquid IV container source;
an ultrasonic actuator constructed substantially of non-magnetic material which creates mechanical movement of the pump in response to applied multiphasic electrical signals to provide positive displacement of the IV liquid from the IV container source; and
a controller, including a central processing unit and memory, that stores operating programs, the controller disposed within an electrically conductive shielding structure that is constructed of non-magnetic material for operation in an MRI environment, the controller communicating with the ultrasonic actuator to selectively energize the actuator to drive the pump, and thereby transfer liquid from the IV container source through the liquid conduit at a controllable volumetric rate,wherein the controller and the ultrasonic actuator are housed within an integrated housing unit.
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Abstract
Liquid infusion apparatus includes non-magnetic materials in a pumping structure and drive motor therefor, and in a controller that supplies drive signals to the motor to facilitate convenient operation in intense magnet fields without distorting the magnetic fields and without radiating objectionable radio-frequency interference.
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Citations
20 Claims
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1. An IV infusion delivery apparatus capable of operating in an MRI environment, the apparatus comprising:
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a pump disposed to receive a liquid conduit and to transfer IV liquid through the liquid conduit from a liquid IV container source; an ultrasonic actuator constructed substantially of non-magnetic material which creates mechanical movement of the pump in response to applied multiphasic electrical signals to provide positive displacement of the IV liquid from the IV container source; and a controller, including a central processing unit and memory, that stores operating programs, the controller disposed within an electrically conductive shielding structure that is constructed of non-magnetic material for operation in an MRI environment, the controller communicating with the ultrasonic actuator to selectively energize the actuator to drive the pump, and thereby transfer liquid from the IV container source through the liquid conduit at a controllable volumetric rate, wherein the controller and the ultrasonic actuator are housed within an integrated housing unit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A pumping apparatus capable of operating in an MRI environment, comprising:
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a plurality of pump elements arranged to squeeze a liquid conduit in a peristaltic manner; an ultrasonic actuator constructed of non-magnetic material which effects mechanical movement of the plurality of pump elements in response to applied multiphasic electrical signals, the mechanical movement of pump elements providing positive displacement of an IV liquid from an IV container source; a controller communicating with the ultrasonic actuator to selectively energize the actuator at a controllable rate; and a housing constructed of non-magnetic conductive shielding material disposed around the controller and the ultrasonic actuator to substantially inhibit radiation of RFI. - View Dependent Claims (12, 13, 14, 15)
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16. A method of providing positive displacement of an IV liquid from an IV container source in an MRI environment, comprising:
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receiving input from a control unit to establish a fluid dose of an IV liquid to be delivered from an IV container source; engaging a liquid conduit with a plurality of pump elements arranged to squeeze the liquid conduit in a peristaltic manner; and applying a multiphasic electrical signal to an ultrasonic actuator constructed of non-magnetic material, the actuator being coupled to the plurality of pump elements and thereby providing positive displacement of an IV liquid from an IV container source, wherein the control unit and the ultrasonic actuator are part of an integrated housing unit and wherein operation of the actuator to provide positive displacement of the IV liquid from the IV container source does not significantly distort a magnetic field around an MRI scanner. - View Dependent Claims (17, 18, 19, 20)
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Specification