Syringe content detection using RF energy

• US 8,141,417 B2
• Filed: 08/06/2008
• Issued: 03/27/2012
• Est. Priority Date: 08/23/2007
• Status: Active Grant

• Current Assignee: Liebel Flarsheim Co LLC (Mallinckrodt plc)
• Original Assignee: Mallinckrodt LLC (Mallinckrodt plc)
• Inventors: Gibson, Chad M., Ortenzi, Vernon D.
• Primary Examiner(s): Larkin, Daniel
• Application Number:
  US12/439,184
• Publication Number:
  US 20090322545A1
• Time in Patent Office: 1,329 Days
• Field of Search: 731/49, 324/639, 604/151
• US Class Current: 73/149
• CPC Class Codes: A61M 2005/14553 comprising a pressure jacket
• CPC Class Codes: A61M 2205/18 with alarm
• CPC Class Codes: A61M 2205/3317 Electromagnetic, inductive or dielectric measuring means
• CPC Class Codes: A61M 2205/6054 Magnetic identification systems
• CPC Class Codes: A61M 5/007 for contrast media
• CPC Class Codes: A61M 5/14546 Front-loading type injectors
• CPC Class Codes: A61M 5/1684 by detecting the amount of infusate remaining, e.g. signalling end of infusion
• CPC Class Codes: A61M 5/365 Air detectors A61M5/1684 takes precedence; in extracorporeal blood circuits A61M1/3626
• CPC Class Codes: G01F 23/2845 for discrete levels G01F23/288, G01F23/292 take precedence

Abstract

The present invention includes medical fluid injector systems that detect the contents and/or volume of such contents within a syringe of the system. For example, an RF signal from a first antenna of a medical fluid injector may be transmitted through a syringe associated with the medical fluid injector. At least some of the transmitted RF signal may be received by a second antenna of the medical fluid injector. An amount of the RF signal received by the second antenna may be measured to provide information regarding the contents and/or volume of such contents within the syringe.

Claims

1. A syringe assembly comprising:

a syringe mount; and

a syringe mounted on the syringe mount, the syringe mount comprising;

a source of RF energy;

a first antenna to transmit RF energy from the source, wherein the first antenna is located proximate to the syringe on the syringe mount; and

a second antenna to receive RF energy transmitted from the first antenna, wherein the second antenna is located proximate to the syringe on the syringe mount, and wherein the second antenna is positioned such that at least part of the RF energy that is transmitted from the first antenna travels through the syringe prior to receipt by the second antenna.

2. The syringe assembly of claim 1, further comprising a third antenna configured to receive RF energy from the first antenna, wherein the third antenna is located proximate to the syringe on the syringe mount, and wherein the third antenna is positioned such that at least part of the RF energy that is transmitted from the first antenna travels through the syringe prior to receipt by the third antenna.

3. The syringe assembly of claim 1, further comprising an RF receiver, wherein the second antenna is coupled to the RF receiver.

4. The syringe assembly of claim 3, wherein the RF receiver is configured to measure change in RF energy received by the second antenna from the first antenna.

5. The syringe assembly of claim 1, wherein the first and second antennae are dipole antennas.

6. The syringe assembly of claim 1, wherein the first and second antennae are loop antennas.

7. The syringe assembly of claim 1, wherein the RF energy from the source is adjustable in frequency.

8. The syringe assembly of claim 1, wherein the RF energy from the source is adjustable in magnitude.

9. The syringe assembly of claim 1, wherein the RF energy from the source is transmitted at a fixed, predetermined frequency.

10. The syringe assembly of claim 1, wherein the RF energy from the source is transmitted at a fixed, predetermined magnitude.

11. The syringe assembly of claim 1, wherein the syringe comprises an RFID tag.

12. A medical injector system comprising the syringe assembly of claim 1, wherein the medical injector system is configured to compare an amount of the RF energy transmitted from the first antenna with an amount of the RF energy received by the second antenna to determine content within the syringe.

13. A medical injector system comprising the syringe assembly of claim 1, wherein the medical injector system is configured to compare an amount of the RF energy transmitted from the first antenna with an amount of the RF energy received by the second antenna to determine if medical fluid is present within the syringe.

14. A medical injector system comprising the syringe assembly of claim 1, wherein the medical injector system is configured to compare an amount of the RF energy transmitted from the first antenna with an amount of the RF energy received by the second antenna to determine an approximate amount of medical fluid in the syringe.

15. A medical injector system comprising the syringe assembly of claim 1, wherein the medical injector system is configured to compare an amount of the RF energy transmitted from the first antenna with an amount of the RF energy received by the second antenna to determine whether the syringe is filled with:

a) medical fluid;

b) a mixture of medical fluid and air;

or c) air.

16. A method of operation for a medical fluid injector, the method comprising:

transmitting an RF signal from a first antenna of a medical fluid injector through a syringe associated with the medical fluid injector;

receiving at least some of the RF signal via a second antenna of the medical fluid injector; and

measuring an amount of the RF signal received by the second antenna.

17. The method of claim 16, further comprising:

disabling the medical fluid injector based, at least in part, on the measuring.

18. The method of claim 16, further comprising:

enabling initiation of an injection protocol based, at least in part, on the measuring.

20. The method of claim 16, further comprising:

comparing the amount of the RF signal received by the second antenna to an amount of the RF signal transmitted from the first antenna.

21. The method of claim 16, further comprising:

determining if medical fluid is present within the syringe, wherein the determining is based, at least in part, on the measuring.

22. The method of claim 16, further comprising:

determining an approximate volume of medical fluid in the syringe, wherein the determining is based, at least in part, on the measuring.

23. The method of claim 22, further comprising:

disabling the medical fluid injector if the determined approximate volume is less than that required to perform a programmed injection protocol.

24. The method of claim 22, further comprising:

providing an audible warning, a visible warning, or a combination thereof if the determined approximate volume is less than that required to perform a programmed injection protocol.

25. The method of claim 16, wherein the RF signal has a wavelength smaller than a diameter of the syringe.

26. The method of claim 16, further comprising:

determining whether the syringe is filled with;

a) medical fluid;

b) a mixture of medical fluid and air;

or c) air, all from the measuring.

19. The method of clam 16, further comprising:

automatically initiating a programmed injection protocol based, at least in part, on the measuring.