Bioimpedance measurement using controller-switched current injection and multiplexer selected electrode connection
First Claim
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1. A system for measuring a voltage in a body part, the system comprisinga multiplexing unit;
- N body leads for electrically connecting the multiplexing unit to the body part;
an impedance module for generating a current and for measuring a resultant voltage, the impedance module calculating an impedance from the current and the resultant voltage;
a controller switching unit electrically connecting the impedance module to the multiplexing unit, the controller switching unit having a first switch connected to the multiplexer and at least a second switch connected to the multiplexer to allow the current to flow through the body part between two body leads, n1 and n2 of the N body leads, and the resultant voltage to be measured between two body leads, n3 and n4 of the N body leads, where n1≠
n2 and n3≠
n4, but where n1 n2 n3 and n4 need not otherwise be distinct;
a current input lead connected to the first switch for injecting the current into the body part;
a current output lead connected to the second switch for receiving the current from the body part; and
a first voltage lead connected to the first switch and a second voltage lead connected to the second switch for measuring the resultant voltage.
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Abstract
A system and method for measuring a voltage in a body part are described. The system includes a multiplexing unit, and N body leads for electrically connecting the multiplexing unit to the body part. The system also includes a controller switching unit for allowing a current to flow through the body part between two body leads, n1 and n2 of the N body leads, and a resultant voltage to be measured between two body leads, n3 and n4 of the N body leads, where n1≠n2 and n3≠n4, but where n1 n2 n3 and n4 need not otherwise be distinct.
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Citations
19 Claims
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1. A system for measuring a voltage in a body part, the system comprising
a multiplexing unit; -
N body leads for electrically connecting the multiplexing unit to the body part; an impedance module for generating a current and for measuring a resultant voltage, the impedance module calculating an impedance from the current and the resultant voltage; a controller switching unit electrically connecting the impedance module to the multiplexing unit, the controller switching unit having a first switch connected to the multiplexer and at least a second switch connected to the multiplexer to allow the current to flow through the body part between two body leads, n1 and n2 of the N body leads, and the resultant voltage to be measured between two body leads, n3 and n4 of the N body leads, where n1≠
n2 and n3≠
n4, but where n1 n2 n3 and n4 need not otherwise be distinct;a current input lead connected to the first switch for injecting the current into the body part; a current output lead connected to the second switch for receiving the current from the body part; and a first voltage lead connected to the first switch and a second voltage lead connected to the second switch for measuring the resultant voltage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for measuring a voltage in a body part, the method comprising
providing a multiplexing unit; -
connecting the body part to the multiplexing unit with N body leads; generating a current with an impedance module; electrically connecting the multiplexer to a first switch in a controller switching unit; electrically connecting the multiplexer to a second switch in the controller switching unit; injecting current into the body part with a current input lead that is connected to the first switch so that current is sent by the multiplexer between two body leads, n1 and n2 of the N body leads in response to control signals sent by the controller switching unit; receiving the current from the body part with a current output lead that is connected to the second switch; measuring a resultant voltage between two body leads, n3 and n4 of the N body leads, where n1≠
n2 and n3≠
n4, but where n1 n2 n3 and n4 need not otherwise be distinct, the resultant voltage measured with a first voltage lead connected to the first switch and a second voltage lead connected to the second switch;measuring the resultant voltage with the impedance module; and calculating an impedance from the current and the resultant voltage. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19)
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Specification