Bioimpedance measurement using controller-switched current injection and multiplexer selected electrode connection
AssigneeZ-Tech (Canada) Inc.
InventorsKenneth Carless Smith, Joel Steven Ironstone, Frank Zhang
Life of this patent
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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.
Claims26
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;
- and
- 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.
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;
- sending a current through the body part between two body leads, n1 and n2 of the N body leads in response to control signals sent by a controller switching unit;
- and
- 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.
A system for measuring an electrical property in a body part, the system comprising
- a multiplexing unit;
- N body leads for electrically connecting the multiplexing unit to the body part;
- and
- a controller switching unit adapted to allow both bipolar and tetrapolar measurements using the N body leads.
A system for measuring an electrical property in a body part, the system comprising
- a multiplexing unit;
- N body leads for electrically connecting the multiplexing unit to the body part;
- and
- a controller switching unit adapted to allow a) a particular one of the N body leads to inject current into the body part for measuring a first resultant electrical property in a first measurement, and b) the particular one of the N body leads to measure a second resultant electrical property that results from injecting current into the body part in a second measurement.
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;
- sending a current into the body part via a particular one of the N body leads to obtain a first resultant electrical property in a first measurement;
- injecting current into the body part in a second measurement;
- and
- measuring a second resultant electrical property with the particular one of the N body leads in the second measurement.
Dependencies are inferred from the claim text.