Patient cable for medical measurements

Details Patient cable for medical measurements Patient cable for medical measurements

2007-11-13

2007-11-13

Nguyen, Chau N. (Department: 2831)

Electricity: conductors and insulators

Conduits, cables or conductors

Combined

C600S421000, C600S411000

Reexamination Certificate

active

10871530

ABSTRACT:
The invention relates to a patient cable for medical measurements performed in connection with Magnetic Resonance Imaging (MRI). In order to eliminate the risk of thermal injuries without compromising the signal-to-noise ratio more than what is required for patient safety, the patient cable comprises two successive cable elements having different resistance characteristics. The second cable element, which is connected by the first cable element to the patient, has a total resistance increased from a normal high-conductivity resistance value of a patient cable to suppress antenna resonances in the second cable element. The first cable element, which is connected to the electrodes on the skin of the patient, has a total resistance substantially greater than that of the second cable element to prevent electromagnetically induced currents from flowing to the patient and to prevent excessive heating of the cable by electromagnetic induction.

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Recording of EEG during fMRI Experiments: Patient Safety, Louis Lemieux et al., Magnetic resonance in Medicine, 38:943-952, 1997.
Investigation of the Factors Responsible for Burns During MRI, Dempsey et al., Journal of Magnetic Resonance Imaging 13:627-631 (2001).
EP Communication dated Oct. 27, 2005.

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