Interfaced base unit and display system for an MRI magnet room

• US 8,121,667 B2
• Filed: 05/10/2007
• Issued: 02/21/2012
• Est. Priority Date: 05/12/2006
• Status: Active Grant

• Current Assignee: Invivo Corporation (Koninklijke Philips N.V.)
• Original Assignee: Koninklijke Philips Electronics N.V. (Koninklijke Philips N.V.)
• Inventors: Fisher, Stephen Douglas, Harwell, Robert A., Kilden-Pedersen, Jorgen, Weeks, Arthur R. Jr., Van Arsdel, Kenneth
• Primary Examiner(s): Yao, Sam
• Assistant Examiner(s): Archer, Marie
• Application Number:
  US12/440,033
• Publication Number:
  US 20100036236A1
• Time in Patent Office: 1,748 Days
• Field of Search: 600300-301, 600363-365, 600373-374, 600377-379, 600382-384, 600386-394, 600407-481, 600/485, 600500-503, 600/509, 600515-519, 600529-531, 600544-547, 600/549, 600587-595, 439/620.01, 439/620.07, 439/620.21, 439/625, 439/626, 439/627, 361/114, 361/115, 361/600, 361/636, 361/640, 361/643, 361/679.01, 361/679.04, 361/679.05, 361/679.06, 361/679.4, 361/679.41, 361/816, 361/817, 361/818, 361/819
• US Class Current: 600/411
• CPC Class Codes: A61B 5/002 Monitoring the patient using a local or closed circuit, e.g. in a room or building A61B5/0017 takes precedence
• CPC Class Codes: A61B 5/024 Detecting, measuring or recording pulse rate or heart rate A61B5/0205, A61B5/021 take precedence
• CPC Class Codes: A61B 5/055 involving electronic [EMR] or nuclear [NMR] magnetic resonance, e.g. magnetic resonance imaging
• CPC Class Codes: A61B 5/0816 Measuring devices for examining respiratory frequency measuring frequency of electric signals G01R23/00
• CPC Class Codes: A61B 5/145 Measuring characteristics of blood in vivo, e.g. gas concentration, pH value; Measuring characteristics of body fluids or tissues, e.g. interstitial fluid, cerebral tissuemeasuring of blood pressure or blood flow A61B5/02; non-radiation detecting or locating of foreign bodies in blood A61B5/06
• CPC Class Codes: A61B 5/7203 for noise prevention, reduction or removal
• CPC Class Codes: A61N 1/3718 Monitoring of or protection against external electromagnetic fields or currents
• CPC Class Codes: G01R 33/28 Details of apparatus provided for in groups G01R33/44 - G01R33/64
• CPC Class Codes: G06F 1/163 Wearable computers, e.g. on a belt
• CPC Class Codes: H02J 2310/23 The load being a medical device, a medical implant, or a life supporting device
• CPC Class Codes: H02J 7/0013 acting upon several batteries simultaneously or sequentially H02J7/1423 takes precedence
• CPC Class Codes: H02J 7/345 using capacitors as storage or buffering devices

Abstract

A base unit operable with a wireless patient monitoring unit used to acquire physiological data during an MRI examination is constructed to have a detachable display unit. The detachable display unit wirelessly communicates with the base unit when in a roving mode. The detachable display unit may also have a magnetically-hardened power supply that does not saturate during an MRI examination. Such a magnetically-hardened power supply allows the display unit to operate when proximate or in the magnetic field generated by an MRI machine during an MRI examination.

Claims

1. A base station for an MRI compatible patient monitor device, the base station positionable outside a bore of a magnet during an MRI examination, the base station comprising:

a movable stanchion disposed in a shielded magnetic resonance room;

a monitor unit which receives wireless transmissions of data from a patient sensor that acquires physiological signals from a patient in the bore of the magnet, the monitor being mounted on the stanchion; and

a display unit which wirelessly communicates with the monitor unit and displays information associated with the data received from the patient sensor by the monitor unit, the display unit being movable independently of the monitor unit in the shielded magnetic resonance room, the display init including;

a rechargeable battery that provides power to the display unit when the display unit is remote from the stanchion, the stanchion providing charging current to the rechargeable battery when the display unit is mounted to the stanchion, and

a magnetically hardened power supply operative, without saturation, in high-flux magnetic fields up to 15,000 Gauss to manage the rechargeable battery during an MRI examination.

2. The base station of claim 1 wherein the monitor unit receives wireless transmissions of data from the patient sensor on radio waves on a first channel and transmits data to the display unit on radio waves on a second channel different from the first channel.

3. The base station of claim 1 wherein the display unit includes:

an LCD display screen; and

LEDs which backlight the LCD display screen.

4. The base station of claim 1 wherein the display unit includes:

a backlight display screen and backlights which operate in the bore of the magnet and do not interfere with the MRI examination;

a rechargeable battery which powers the backlight display; and

a magnetically hardened power supply which recharges the rechargeable battery without saturation when positioned adjacent to the bore of the magnet.

5. The base station of claim 1 wherein the stanchion carries a first set of contacts and the display device carries a second set of contacts, the first and second sets of contacts communicating to transfer power from the stanchion to the display unit when the display unit is temporarily mounted to the stanchion.

6. The base station of claim 5 wherein the monitor unit automatically suspends wireless communications to the display unit when the display unit is mounted to the stanchion.

8. The base station of claim 4 wherein the display unit includes lighting elements which backlight a display screen without interfering with magnetic resonance imaging.

9. The base station of claim 4 wherein the display unit includes light emitting diodes which backlight a display screen without interfering with magnetic resonance imaging.

7. A base station for an MRI compatible patient monitor device, the base station positionable outside the bore of the magnet during an MRI examination and comprising:

a monitor unit which receives wireless transmissions of data from a patient sensor that acquires physiological signals from a patient;

a display unit positionable remotely from the monitor unit and in wireless communication with the monitor unit to display information associated with the data received from the patient sensor by the monitor unit;

a stanchion, the display unit being mountable to the stanchion when desired, the stanchion having a hot shoe and the display unit having a hot shoe socket which interfaces with the hot shoe when the display unit is mounted to the stanchion, the hot shoe including a first set of contacts and the hot shoe socket including a second set of contacts, the sets of contacts transferring power from the stanchion to the display unit when the display unit is mounted to the stanchion;

the display unit including a rechargeable battery that provides power to the display unit when the display unit is remote from the stanchion, the stanchion providing charging current to the rechargeable battery when the display unit is mounted to the stanchion; and

the display unit further including a magnetically hardened power supply to manage the rechargeable battery and being operative, without saturation, during an MRI examination;

wherein the magnetically hardened power supply is operative, without saturation, in high-flux magnetic fields up to 15,000 Gauss.

10. A base station for an MRI compatible patient monitor device, the base station positioned in a radiofrequency shielded magnet room and outside a bore of magnet during and MRI examination and comprising:

a stanchion movably disposed in the radiofrequency shielded magnet room;

a dock mounted on the stanchion;

a monitor unit, connected to the dock, which receives physiological information from a patient in the bore during an MRI examination and processes the received physiological information; and

a display unit connectable to the dock by a quick-connect connector which provides power to the display unit and transfers the processed information from the monitor unit to the display unit when the display unit is connected to the dock, the display unit including a rechargeable battery which powers the display unit when the display unit is disconnected from the dock and a wireless receiver which wirelessly receives the processed information from the monitor unit during the MRI examination when the display unit is disconnected from the dock.

11. The base station of claim 10 wherein the display unit includes a backlight screen and LEDs which backlight the screen when the display is in the bore during the MRI examination without interfering with the MRI examination.

12. The base station of claim 10 wherein the monitor unit is configured to automatically suspend wireless transmission of the processed information to the display unit when the display unit is connected to the dock.

13. The base station of claim 10 wherein the dock includes a hot shoe and the display unit includes a hot shoe socket configured to receive the hot shoe when the display unit is connected to the dock.

14. The base station of claim 13 wherein the hot shoe includes a first set of electrical contacts and the hot shoe socket includes a second set of electrical contacts, and wherein the first and second sets of electrical contacts transfer power from the dock to the display unit when the display unit is connected to the dock.

15. The base station of claim 13 wherein the quick connect connector includes a switch operator that closes a switch when the display unit is connected to the dock to deliver power from the dock to the display unit.

16. The base station of claim 10 wherein the display unit further comprises a magnetically hardened power supply that operates in high-flux magnetic fields up to 15,000 Gauss, without saturation, during the MRI examination.

17. A display unit operable to display information acquired from a patient in a bore of a magnet during an MRI examination, comprising:

a display unit housing enclosing electronic components and having a quick-connect connector for repeated connection to and disconnection from a dock, the electronic components including a receiver for wirelessly receiving data associated with the information received from the patient during an MRI examination;

a screen which graphically displays data associated with information received from a patient during an MRI examination;

a battery;

and a magnetically-hardened power supply that manages the battery to deliver power to the electronic components when the display unit is detached from the dock, and wherein the magnetically-hardened power supply is operative, without saturation, in magnetic fields of up to 15,000 Gauss, during an MRI examination.

18. The display unit of claim 17 further comprising a set of electrical contacts that mate with corresponding electrical contacts of a dock when the display unit housing is connected to the dock, the electrical contacts designed to facilitate the transfer of power from the dock to the at least one of the electronic components and the battery.

19. The display unit of claim 18 wherein the screen is back lit by LED lighting elements which do not interfere with the MRI examination.