Active interference-noise cancellation device, and a method in relation thereto
First Claim
1. An active noise cancellation device for a medical device, comprising:
- an active circuit having a first input connection, a second input connection, and an output connection, wherein said second input connection is connected to at least one predetermined reference signal;
a low-impedance body connection electrode adapted to be in electrical contact with a bloodstream of a subject, wherein the low-impedance body connection electrode is connected to said first input connection; and
a feedback branch connecting the output connection with the first input connection;
wherein said feedback branch comprises a current limiting circuit adapted to limit a current through said feedback branch to be lower than a predetermined current.
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Accused Products
Abstract
An active noise cancellation device (2) for a medical device includes an active circuit having a first input connection (8), a second input connection (10), and an output connection (12). The second input connection (10) is connected to at least one predetermined reference signal. The active noise cancellation device (2) further includes a low-impedance body connection electrode (4) adapted to be in electrical contact with a bloodstream of a subject, wherein the low-impedance body connection electrode (4) is connected to said first input connection (8), and a feedback branch (14) connecting the output connection (12) with the first input connection (8). The feedback branch (14) comprises a current limiting circuit (18) to limit a current through said feedback branch (14) to be lower than a predetermined current.
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Citations
26 Claims
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1. An active noise cancellation device for a medical device, comprising:
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an active circuit having a first input connection, a second input connection, and an output connection, wherein said second input connection is connected to at least one predetermined reference signal; a low-impedance body connection electrode adapted to be in electrical contact with a bloodstream of a subject, wherein the low-impedance body connection electrode is connected to said first input connection; and a feedback branch connecting the output connection with the first input connection; wherein said feedback branch comprises a current limiting circuit adapted to limit a current through said feedback branch to be lower than a predetermined current. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method of active noise and interference cancellation in a medical device, comprising:
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providing an active circuit having a first input connection, a second input connection, and an output connection, wherein said second input connection is connected to at least one predetermined reference signal, arranging a low-impedance body connection electrode in electrical contact with a bloodstream of a subject, wherein said body connection electrode is connected to said first input connection, providing a feedback branch connecting said output connection with said first input connection, and limiting an error correction current through said feedback branch by providing a current limiting circuit such that said error correction current is lower than a predetermined current. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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26. A medical device comprising:
an active noise cancellation device comprising; an active circuit having a first input connection, a second input connection, and an output connection, wherein said second input connection is configured to be connected to at least one reference signal; a low-impedance body connection electrode adapted to be in electrical contact with a bloodstream of a subject, wherein the low-impedance body connection electrode is connected to said first input connection; and a feedback branch connecting the output connection with the first input connection; wherein said feedback branch comprises a current limiting circuit configured to limit a current through said feedback branch to be lower than a predetermined current.
Specification