Surgery – Truss – Pad
Patent
1993-07-29
1995-11-14
Zele, Krista M.
Surgery
Truss
Pad
324318, 335299, A61B 5055
Patent
active
054657199
ABSTRACT:
A bobbin for holding a gradient magnetic field coil, having a changeable size and sectional shape (a separable bobbin) is constituted by assembling coil supporters (a bobbin divided into a plurality of segments). The separable bobbin has coil supporters of an upper part a bottom part and a set of side surface parts and at least two supporting rods made of a nonmagnetic substance are fitted to the side surface parts of the coil supporters. Holes permitting the insertion of the supporting rods are bored in the upper and bottom parts of the coil supporters. The length d1 between both side surface parts can be made variable by adjusting the insertion length of the supporting rod into the upper and bottom parts. Accordingly, the distance between a patient and a gradient magnetic field can be reduced, and an intended gradient magnetic field intensity can be generated by a smaller current producing the gradient magnetic field than in the prior art. Setting of the patient to an MRI imaging apparatus becomes also easier, and there can be obtained a gradient magnetic field coil capable of being easily fitted and removed to and from the MRI imaging apparatus.
REFERENCES:
patent: 4897604 (1990-01-01), Carlson et al.
patent: 4943775 (1990-07-01), Boskamp et al.
patent: 4959613 (1990-09-01), Yamamoto et al.
patent: 5256969 (1993-10-01), Miyajima et al.
patent: 5285160 (1994-02-01), Loos et al.
patent: 5311134 (1994-05-01), Yamagata et al.
Itagaki Hiroyuki
Shiono Hidemi
Takiguchi Kenji
Taniguchi Yo
Yamamoto Etsuji
Hitachi , Ltd.
Zele Krista M.
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