Respiratory inductive plethysmography sensor
First Claim
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1. A self-inductance sensor for measuring the change in circumference of an object comprising:
- an electrical conductor having a first portion and a second portion, each portion of the conductor closely juxtaposed to the other portion forming a repetitive pattern of alternating active segments and inactive segments, said active segments forming substantially enclosed areas being bounded by said first portion and by said second portion, said enclosed areas changing shape when said conductor is distended, said conductor being adapted to circumscribe the object; and
means for measuring the self-inductance of the conductor to indicate the relative change in shape of the enclosed areas and, thus, the change in circumference of the object.
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Abstract
An improved inductive plethysmography sensor involving a conductor having alternating active and inactive segments. The active segments preferably have a narrow diamond shape which minimizes the possibility of artifact. Because of the conductor design, the sensors can be placed completely about the chest and abdomen with any overlap arranged so that active segments overlap inactive segments.
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Citations
19 Claims
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1. A self-inductance sensor for measuring the change in circumference of an object comprising:
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an electrical conductor having a first portion and a second portion, each portion of the conductor closely juxtaposed to the other portion forming a repetitive pattern of alternating active segments and inactive segments, said active segments forming substantially enclosed areas being bounded by said first portion and by said second portion, said enclosed areas changing shape when said conductor is distended, said conductor being adapted to circumscribe the object; and means for measuring the self-inductance of the conductor to indicate the relative change in shape of the enclosed areas and, thus, the change in circumference of the object. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A self-inductance sensor for measuring the change in circumference of an object comprising:
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an elongate band of distensible material adapted to circumscribe the object; an electrical conductor secured to a first side the band and having a first portion extending from a first position adjacent one end of the band to a second position adjacent the other end of the band and a second portion extending from said second position to said first position, each portion of the conductor closely juxtaposed to the other portion forming a repetitive pattern of alternating active segments and inactive segments, said active segments forming substantially enclosed areas being bounded by said first portion and by said second portion, said enclosed areas changing shape when said band is distended; and means for measuring the self-inductance of the conductor to indicate the relative extension of the band and thus, the change in circumference of the object. - View Dependent Claims (14, 15, 16, 17, 18, 19)
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Specification