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US4774486A
Expired / Lapsed
US
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Coil mounting for NMR diagnostic apparatus
Assignee: Mitsubishi Electric Corp
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Filing: 1986-03-27
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Granted: 1988-09-27
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Expires: 2006-03-27
Abstract
Abstract A mounting structure for the inclined magnetic field coils of an NMR imaging diagnostic apparatus, wherein the windings 9, 9 . . . of the coils 3, 4, 5 are disposed in the magnetic field generated by a main coil 2 and are wound around and held on a bobbin 6 via an interposed vibrationproofing material 13. In a second embodiment, the windings 9, 9 . . . and the bobbin 6 are integrally molded with a damping material 15.
Inventors
- 👤 Kazuki Moritsu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 01:31
CPC Classifications
G; G01; G01R; G01R33/00; G01R33/20; G01R33/28; G01R33/38; G01R33/385; G01R33/3854
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
148 words
A nuclear magnetic resonance imaging diagnostic apparatus, comprising: (a) a cylindrical main coil (2) disposed concentrically surrounding a patient examination zone defined by a cylindrical bobbin (6) and spaced thereform, (b) a plurality of inclined magnetic field coils (3,4,5) disposed in a magnetic field generated by said main coil and wound around an outer surface of said bobbin, (c) a discrete layer of flexible damping material (13) interposed between inner surfaces of said inclined magnetic field coils and said outer surface of said bobbin to absorb audible frequency vibrations generated by the field coils in response to signals induced therein by the magnetic field of the main coil and thereby shield the examination zone from such vibrations, and (d) an inertial mass of non-magnetic material (14) rigidly coupled to said inclined magnetic field coils to reduce the characteristic vibration frequency of each of said inclined magnetic field coils.
Claim 2
Dependent Claim
148 words
A nuclear magnetic resonance imaging diagnostic apparatus, comprising: (a) a cylindrical main coil (2) disposed concentrically surrounding a patient examination zone defined by a cylindrical bobbin (6) and spaced thereform, (b) a plurality of inclined magnetic field coils (3,4,5) disposed in a magnetic field generated by said main coil and wound around an outer surface of said bobbin, (c) a discrete layer of flexible damping material (13) interposed between inner surfaces of said inclined magnetic field coils and said outer surface of said bobbin to absorb audible frequency vibrations generated by the field coils in response to signals induced therein by the magnetic field of the main coil and thereby shield the examination zone from such vibrations, and (d) an inertial mass of non-magnetic material (14) rigidly coupled to said inclined magnetic field coils to reduce the characteristic vibration frequency of each of said inclined magnetic field coils.
Claim 3
Dependent Claim
17 words
An apparatus as set forth in claim 1, wherein said inertial mass is made of stainless steel.
Claim 4
Independent Claim
19 words
An apparatus as set forth in claims 1 or 2, wherein said vibration damping material is made of rubber.
Claim 5
Dependent Claim
111 words
A nuclear magnetic resonance imaging diagnostic apparatus, comprising: a cylindrical main coil (2) disposed concentrically surrounding a patient examination zone defined by a cylindrical bobbin (6) and spaced therefrom, a plurality of inclined magnetic field coils (3,4,5) disposed in a magnetic field generated by said main coil and wound around an outer surface of said bobbin, and a discrete layer of vibration damping material (15) integrally molded with and surrounding said inclined magnetic field coils and said bobbin to absorb audible frequency vibrations generated by the field coils in response to signals induced therein by the magnetic field of the main coil and thereby shield the examination zone from such vibrations.
Claim 6
Dependent Claim
111 words
A nuclear magnetic resonance imaging diagnostic apparatus, comprising: a cylindrical main coil (2) disposed concentrically surrounding a patient examination zone defined by a cylindrical bobbin (6) and spaced therefrom, a plurality of inclined magnetic field coils (3,4,5) disposed in a magnetic field generated by said main coil and wound around an outer surface of said bobbin, and a discrete layer of vibration damping material (15) integrally molded with and surrounding said inclined magnetic field coils and said bobbin to absorb audible frequency vibrations generated by the field coils in response to signals induced therein by the magnetic field of the main coil and thereby shield the examination zone from such vibrations.
Claim 7
Dependent Claim
20 words
An apparatus as set forth in claim 4, wherein said damping material is an epoxy derivative binary reaction type resin.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-09-27 | 1992-03-28 | 1992-09-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-09-27 | 1996-03-28 | 1996-09-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-09-27 | 2000-03-28 | 2000-09-27 | $7700.00 | Window Closed / Lapsed |