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 coupled to provide mechanical movement to 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 structure a 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.
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Accused Products
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.
74 Citations
18 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 coupled to provide mechanical movement to 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 structure a 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A pumping apparatus, 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 coupled to provide 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 material disposed around the controller to substantially inhibit radiation of RFI. - View Dependent Claims (11, 12, 13, 14)
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15. A method of providing positive displacement of an IV liquid from an IV container source in an MRI environment, comprising:
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placing a liquid conduit in contact 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 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 (16, 17, 18)
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Specification