Electromagnetic body coil with vacuum cushions

• US 5,945,827 A
• Filed: 05/06/1997
• Issued: 08/31/1999
• Est. Priority Date: 05/10/1996
• Status: Expired due to Term

• Current Assignee: Gore Enterprise Holdings Incorporated (W.L. Gore and Associates)
• Original Assignee: Gore Enterprise Holdings Incorporated (W.L. Gore and Associates), W L GORE & Associates GmbH (W.L. Gore & Associates)
• Inventors: Friedl, Peter, Vij, Kamal, Reykowski, Arne, Gronauer, Volker, Seigerschmidt, Helmut
• Primary Examiner(s): ARANA, LOUIS M
• Application Number:
  US08/851,730
• Time in Patent Office: 847 Days
• Field of Search: 324/318, 324/322, 324/314, 324/319, 324/300, 324/309, 600/421, 600/422
• US Class Current: 324/318
• CPC Class Codes: A61B 5/055 involving electronic [EMR] or nuclear [NMR] magnetic resonance, e.g. magnetic resonance imaging
• CPC Class Codes: A61B 5/702 Posture restraints
• CPC Class Codes: A61B 6/0485 Inflatable rests for lifting of patients
• CPC Class Codes: G01R 33/34007 Manufacture of RF coils, e.g. using printed circuit board technology; additional hardware for providing mechanical support to the RF coil assembly or to part thereof, e.g. a support for moving the coil assembly relative to the remainder of the MR system
• CPC Class Codes: G01R 33/34046 Volume type coils, e.g. bird-cage coils; Quadrature bird-cage coils; Circularly polarised coils

Abstract

Electromagnetic body coil for magnetic resonance tomographic measurements, whereby the body coil has a three-dimensional coil shape and is assembled from at least two partial coils which are capable of being brought into a state of detachable plug-in connection with one another by means of an electrical plug-in connection arrangement and whereby a first partial coil is located inside a cushion, that serves as a patient resting aid, and the second partial coil is located outside this cushion.

Claims

1. An electromagnetic body coil for magnetic resonance tomographic measurements of a body, the body coil comprising:

a three-dimensional coil shape which is assembled from at least two partial coils;

an electrical plug-in connection for electrically interconnecting said partial coils;

an evacuable cushion for receiving a first one of the two partial coils therein, said evacuable cushion serving as a resting aid and being adaptable to the shape of the body,

the other one of the two partial coils being located outside the evacuable cushion.

2. The body coil as set forth in claim 1, said evacuable cushion having a gas-tight jacket and a valve formed in the jacket for inflating and evacuating the evacuable cushion.

3. The body coil as set forth in claim 2, said cushion further having an insertion tube formed in the jacket, the insertion tube serving as an accommodation device for partial coils, whereby a part of the first partial coil, that is located inside the jacket, is passed through the jacket, in a manner that does not damage the gas-tightness of the jacket by virtue of the insertion tube.

4. The body coil as set forth in claim 2, said jacket having at least one textile pouch that serves as a device for accommodating partial coils, whereby the textile pouch accommodates a part of the first partial coil which is located inside the cushion.

5. The body coil as set forth in claim 2, said jacket being formed by a gas-tight and water-tight material that is permeable to water vapor.

6. The body coil as set forth in claim 5, said jacket being fabricated from stretched micro-porous polytetrafluoroethylene.

7. The body coil as set forth in claim 2, said cushion being filled to a fraction of its capacity with small loose particles that are movable in a sand-like manner inside the jacket in the case of an adequately inflated jacket and that are held immovably as in shrink-foil wrapping in the case of an adequately evacuated jacket, said the cushion being provided with a device for accommodating partial coils, said device not impairing the gas-tightness of the jacket.

8. The body coil as set forth in claim 7, said jacket being subdivided, via at least one gas-permeable separating cross-piece, into at least two cushion chambers that are separated from one another and which each accommodate a portion of the small particles.

9. The body coil as set forth in claim 1, said cushion having an exterior formed by a water-tight material that is permeable to water vapor.

10. The body coil as set forth in claim 1, said body coil being embedded in a shape-retaining plastic element that is assembled from a number of partial coils which correspond to the number of partial plastic elements, one of the partial coils being embedded in each of the partial plastic elements in such a way that plug-in sockets, that are associated with the plug-in connection, project out of the partial plastic elements.

11. The body coil as set forth in claim 1, said body coil having a number of self-supporting electrical cable sections that are pre-shaped in partial coil form without additional shape-retaining agents, the cable sections being assembled by means of electrical connectors.

12. The body coil as set forth in claim 11, each cable section containing one or more electrical conductors.

13. The body coil as set forth in claim 12, said connectors being constructed in the form of plug-in connectors.

14. The body coil as set forth in claim 13, each connector comprising a connector housing having electrical connecting contact elements that are connected to the insulation-free ends of the conductors of at least two cable sections, and an electrical connecting network which is arranged in an interior of the housing by means of the connecting contact elements of the connector which are electrically connected to one another in a selectable predetermined connecting pattern.

15. The body coil as set forth in claim 14, at least part of the connectors being constructed as plug-in connectors and the connecting contact elements being constructed as plug-in contact elements that are in a state of plug-in connection with opposite plug-in contact elements at the ends of the cable sections.

16. The body coil as set forth in claim 14, said plug-in connectors, that connect cable sections, participate in the plug-in connection arrangement for the plug-in connection of the partial coil bodies.

17. The body coil as set forth in claim 11, said cable sections having at least one plastic component that is capable of being brought into the desired shape by means of bending and subsequent tempering.

18. The body coil as set forth in claim 17, said plastic component comprising a material with a memory effect.

19. The body coil as set forth in claim 11, said cable sections being constructed in the form of ribbon cable sections.

20. The body coil as set forth in claim 19, said ribbon cable sections being constructed with flat conductors.

21. The body coil as set forth in claim 1, said body coil and the cushion being constructed with materials that are capable of being disinfected and/or sterilized.

22. The body coil as set forth in claim 21, said materials being selected from the group comprising:

polyoxymethylene;

polycarbonate; and

polyurethane, each material capable of being treated in an autoclave.