Tuned frequency portal for power transfer in MRI environment
First Claim
Patent Images
1. An MRI compatible patient monitor, comprising:
- a patient sensor circuit communicating with the patient and including an electrical load;
an alternating current power source attached to a source of line power and producing power at a frequency different from a line frequency of the line power; and
an electrical filter connecting the power produced by the alternating current power source to the electrical load, the electrical filter having a rejection band encompassing the line frequency;
wherein line voltage faults are not communicated between the patient sensor circuit and the alternating current power source.
1 Assignment
0 Petitions
Accused Products
Abstract
A circuit for isolating line voltage from a patient in an MRI environment, uses a filter network tuned to line voltage and incorporating blocking capacitors to eliminate the need for bulky air core transformers, complex energy transfer systems, and ferromagnetic components, while providing reduced heating such as might produce patient discomfort.
15 Citations
26 Claims
-
1. An MRI compatible patient monitor, comprising:
-
a patient sensor circuit communicating with the patient and including an electrical load;
an alternating current power source attached to a source of line power and producing power at a frequency different from a line frequency of the line power; and
an electrical filter connecting the power produced by the alternating current power source to the electrical load, the electrical filter having a rejection band encompassing the line frequency;
wherein line voltage faults are not communicated between the patient sensor circuit and the alternating current power source. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
-
-
21. An MRI compatible patient monitor, comprising:
-
a patient sensor circuit communicating with the patient and including an electrical load;
an alternating current power source having a frequency different from a line frequency and providing a power and return conductor; and
an isolating circuit providing at least two isolating capacitors, one on each of the power and return conductors between the alternating current power source and the electrical load; and
wherein the isolating circuit provides a resistance to electrical flow at a line frequency of greater than 50 mega-ohms. - View Dependent Claims (22, 23, 24, 25, 26)
-
Specification