Surgery – Diagnostic testing – Detecting nuclear – electromagnetic – or ultrasonic radiation
Reexamination Certificate
2006-01-31
2006-01-31
Smith, Ruth S. (Department: 3737)
Surgery
Diagnostic testing
Detecting nuclear, electromagnetic, or ultrasonic radiation
C128S897000, C174S126100
Reexamination Certificate
active
06993373
ABSTRACT:
An invasive device17, such as a catheter, is connected to a supply and control unit via a connection conductor21for the transfer of power supply energy and/or LF signals to and from an electrical circuit20in the distal part18of the device. During operation the connection conductor traverses the homogeneous magnetic field and the RF field of the MRI apparatus; this may give rise to heating of the connection conductor and/or to a disturbance of said fields. In order to mitigate these drawbacks, the connection conductor in accordance with the invention is subdivided into mutually separated segments22-i, each of which is much shorter (for example, 1/20) than the wavelength of the RE field in the apparatus; the segments are separated from one another by separating elements23-i(self-inductances) that provide a high inductance for said RF frequencies and a low inductance for comparatively low frequencies.
REFERENCES:
patent: 5294886 (1994-03-01), Duerr
patent: 5916162 (1999-06-01), Snelten et al.
Glowinski et al: “Catheter Visualization Using Locally Induced Actively Controlled Field Inhomogeneities,” Magnetic Resonance In Medicine, Academic Press, Duluth, MN, US, vol. 38, No. 2, Jan. 8, 1997, pp. 253-258.
Van Vaals Johannes Jacobus
Vrijheid Johan Ernst Willy
Koninklijke Philips Electronics , N.V.
Smith Ruth S.
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