Non-magnetic medical infusion device

• US 20050256388A1
• Filed: 06/17/2002
• Published: 11/17/2005
• Est. Priority Date: 06/17/2002
• Status: Active Grant

• Current Assignee: Iradimed Corporation
• Original Assignee: Iradimed Corporation
• Inventors: Susi, Roger E.
• Granted Patent: US 7,267,661 B2
• Time in Patent Office: Days
• US Class Current: 600/407
• CPC Class Codes: A61M 5/007 for contrast media
• CPC Class Codes: A61M 5/14228 with linear peristaltic action, i.e. comprising at least three pressurising members or a helical member

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 magnetic fields without distorting the magnetic fields and without radiating objectionable radio-frequency interface.

Claims

1. Liquid infusion apparatus for operation in an MRI environment, the apparatus comprising:

a linear peristaltic pumping structure constructed of non-magnetic material disposed within an electrically conductive structure to receive a liquid conduit linearly oriented therein to transfer liquid through the pumping structure and liquid conduit from a liquid source in response to selected mechanical movements;

an ultrasonic actuator constructed of non-magnetic material disposed within an electrically conductive structure and coupled to provide mechanical movement to the pumping structure in response to applied multiphasic electrical signals;

a first sensor disposed to produce a first output signal indicative of mechanical movements of the pumping structure;

a second sensor disposed to produce a second output signal indicative of liquid flow through the pumping structure; and

a controller including a central processing unit and memory for storing operating programs disposed within an electrically conductive structure and constructed of non-magnetic material for operation in an MRI environment, the controller communicating with the first and second sensors for receiving the first and second output signals therefrom, and with the ultrasonic actuator for selectively energizing the actuator to transfer liquid through the pumping structure at a controllable volumetric rate.

5. Liquid infusion apparatus as in claim 1 in which the electrically conductive structures disposed about the pumping structure and actuator and controller inhibits radiation of radio frequency interference therefrom.

2-4. -4. (canceled)

6-9. -9. (canceled)

10. Liquid infusion apparatus for operation in an MRI environment, comprising:

non-magnetic peristaltic pumping means disposed within a conductive structure to receive a liquid conduit therein for pumping liquid therethrough;

non-magnetic ultrasonic actuator means disposed within a conductive structure to receive a liquid conduit therein for operating the pumping means in response to applied multiphasic signals at ultrasonic frequencies;

first sensor means for sensing an operating parameter of the pumping means;

second sensor means for sensing liquid flow through the pumping means; and

controller means including processor means and memory means for storing programs operable in an MRI environment and disposed within a conductive structure for applying the multiphasic signals at ultrasonic frequencies to the ultrasonic actuator means for operating the pumping means on stored programs and outputs from the first and second sensor means to pump liquid through the liquid conduit received in the pumping means.

11-15. -15. (canceled)