System and method for communication with an infusion device

• US 8,500,694 B2
• Filed: 01/30/2012
• Issued: 08/06/2013
• Est. Priority Date: 07/13/2007
• Status: Active Grant

• Current Assignee: Iradimed Corporation
• Original Assignee: Iradimed Corporation
• Inventors: Susi, Roger
• Primary Examiner(s): Bosworth, Kami A
• Application Number:
  US13/361,750
• Publication Number:
  US 20120195769A1
• Time in Patent Office: 554 Days
• Field of Search: 604/65, 604/67, 604/118, 604/131, 604/154, 604/207, 604/246, 604/890.1, 604/151, 600/411
• US Class Current: 604/151
• CPC Class Codes: A61M 2205/3306 Optical measuring means
• CPC Class Codes: A61M 2205/3375 Acoustical, e.g. ultrasonic, measuring means
• CPC Class Codes: A61M 2205/3561 local, e.g. within room or hospital
• CPC Class Codes: A61M 2205/3592 using telemetric means, e.g. radio or optical transmission
• CPC Class Codes: A61M 5/14228 with linear peristaltic action, i.e. comprising at least three pressurising members or a helical member
• CPC Class Codes: A61M 5/16831 Monitoring, detecting, signalling or eliminating infusion flow anomalies low-level float-valves causing cut-off A61M5/40; indicating or recording presence, absence or direction of flow in general G01P13/0066
• CPC Class Codes: A61M 5/16854 by monitoring line pressure
• CPC Class Codes: A61M 5/172 electrical or electronic A61M5/16804, A61M5/16831 take precedence
• CPC Class Codes: A61M 5/365 Air detectors A61M5/1684 takes precedence; in extracorporeal blood circuits A61M1/3626
• CPC Class Codes: G16H 20/17 delivered via infusion or injection

Abstract

It may desirable to monitor or control a pump remotely. For example, the pump may be positioned near the patient, with remote control or monitoring of the pump occurring in a control room. In one exemplary embodiment, the pump is used in an MRI environment. In another exemplary embodiment, the pump is used in a hyperbaric chamber. The pump may monitor one or more physiological parameters and transmit them to the remote. The pump may also transmit information relating to the pump'"'"'s operation. The pump may send the device and/or physiological data using one or more packets. The packets may consist of low priority sequential packets and high-priority asynchronous packets. The high-priority packets may enable the real-time monitoring of a patient'"'"'s heart beat or other physiological parameter.

Claims

1. A liquid infusion system configured to facilitate wireless communication between a liquid infusion apparatus within a magnetic resonance imaging (MRI) scan room and a wireless remote external to the MRI scan room, comprising:

a liquid conduit,

a pump disposed to receive the liquid conduit and to transfer a liquid from a liquid source through the liquid conduit in response to activation of the pump,

an actuator configured to provide mechanical movement to the pump to provide displacement of the liquid from the liquid source through the liquid conduit,

a wireless transceiver configured to receive input control information from a remote control and transmit pump operation information to the remote control;

a local controller configured to communicate with the actuator and the wireless transceiver to control transfer of liquid from the liquid source through the liquid conduit at a controllable volumetric rate,

a communication port that provides a wireless communication link with the remote control, wherein the wireless communication link operates within a frequency range that is at least an order of magnitude higher than an operating frequency range of MRI equipment such that the wireless communication link does not interfere with operation of the MRI equipment, and

wherein the local controller operates in conjunction with the remote control such that the pump is capable of operating without the remote control or if communication between the pump and the remote control is interrupted.

2. The system of claim 1, wherein the frequency range of the wireless communication link is within the range of 2.400 GHz to 2.482 GHz.

3. The system of claim 1, wherein the wireless communication link comprises a bi-directional frequency hopping spread spectrum link.

4. The system of claim 1, wherein the pump comprises a shielded housing configured to pass higher frequency radio frequency (RF) signals used for wireless communication while attenuating RF signals having a frequency under about 130 MHz.

5. The system of claim 4, wherein the communication link utilizes a wireless radio transceiver mounted outside of the shielded housing.

6. The system of claim 5, further comprising an antenna and a filter between the antenna and the wireless radio transceiver to inhibit image interfering lower frequency RF noise having a frequency below about 130 MHz from escaping the shielded housing.

7. The system of claim 1, wherein the pump comprises a peristaltic pump and wherein the actuator comprises an ultrasonic motor.

8. The system of claim 1, wherein an alarm occurs when there is a substantial interruption of communication between the remote control and the communication port detected by a signal integrity meter of the remote control.

9. The system of claim 1, wherein the communication link utilizes user-selectable communication channels.

10. The system of claim 9, wherein the user-selectable communication channels enable more than one communication port and remote control combination to work in the same vicinity.

11. The system of claim 10, wherein the remote control can be in communication with a plurality of liquid infusion apparatuses.

12. The system of claim 1, wherein an indication of a status of the communication link is provided to an operator.

13. The system of claim 12, wherein an alert tone sounds when communication over the communication link is established.

14. A liquid infusion system configured to facilitate wireless communication between a liquid infusion apparatus within a magnetic resonance imaging (MRI) scan room and a wireless remote external to the MRI scan room, comprising:

a liquid infusion apparatus configured to be positioned within a radio frequency (RF) shielded room having operating RF-sensitive magnetic resonance imaging (MRI) equipment without interfering with images captured by the MRI equipment, the liquid infusion apparatus comprising;

a liquid conduit;

a peristaltic pump disposed to receive the liquid conduit and to transfer a liquid from a liquid source through the liquid conduit in response to activation of the peristaltic pump, the peristaltic pump comprising a plurality of pumping elements coupled to a rotating pump shaft such that the pumping elements are manipulated in a pumping sequence in response to rotation of the pump shaft to provide a peristaltic pumping action;

an ultrasonic motor coupled to the pumping shaft of the peristaltic pump to provide mechanical movement of the pump elements to provide displacement of the liquid from the liquid source through the liquid conduit;

a sensor that monitors rotation of the pumping shaft and generates control signals indicative of locations of the pump elements during a pumping cycle;

a local pumping controller in communication with the sensor to receive the control signals indicative of the location of the pump elements during an interval of the pumping cycle, the local pump controller further in communication with the ultrasonic motor to drive the pump based, at least in part, on the control signals, thereby modulating an operating speed of the pump shaft such that flow output of the peristaltic pump over time is substantially linear; and

a wireless transceiver; and

a remote configured to communicate with the wireless transceiver of the liquid infusion apparatus bi-directionally through RF shielding of the RF shielded room,

wherein the local pump controller operates in conjunction with the remote, such that an operator can control the liquid infusion apparatus either remotely or locally and such that the peristaltic pump is capable of operating without the remote or if communication between the remote and the peristaltic pump is interrupted.

15. The liquid infusion system of claim 14, wherein the pump shaft comprises an optical encoder disk that rotates with the pump shaft, wherein the sensor comprises one or more optical sensing elements configured to detect marks on the optical encoder disk, and further wherein the one or more optical sensing elements generate control signals indicative of disk position and speed of rotation for transmission to the local pump controller.

16. The liquid infusion system of claim 14, wherein the local pump controller is configured to modulate rotational speed of the pump shaft during each cycle of the peristaltic pump.

17. The liquid infusion apparatus of claim 14, wherein the ultrasonic motor is configured to start and stop in a range from about 3 to about 10milliseconds and in an angular displacement within about 0.3 to about 0.9 degrees of arc.

18. The liquid infusion system of claim 14, wherein the liquid infusion apparatus further comprises a communication port that provides a wireless communication link between the wireless transceiver and the remote, wherein the wireless communication link utilizes a selected channel from a plurality of configured channels.

19. The liquid infusion system of claim 18, wherein communication using the selected channel does not substantially interfere with communications from a liquid infusion apparatus utilizing a second selected channel from the plurality of configured channels.