Method and apparatus for monitoring blood components
First Claim
1. A method of monitoring concentration of components of blood flowing in a flowpath comprisingflowing said components through a transparent channel,directing light to said channel along an axis intersecting said channel,detecting light passing through said channel along said axis with a central detector,detecting light scattered off of said axis with an annular detector, anddetermining condition of components based on said light passing along said axis and/or said light scattered off said axis,said determining involving using said central detector to determine concentration in a low range of concentration values and said annular detector to determine concentration in a high range of concentration values.
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Accused Products
Abstract
Monitoring concentration of components of blood flowing through a flowpath including flowing the components through a transparent channel, directing light to the channel along an axis intersecting the channel, detecting light passing through the channel along the axis, detecting light scattered off of the axis, and determining concentration of components based on the light passing along the axis and/or the light scattered off of the axis. Also disclosed is a movable cover to block ambient light from a photodetector after mounting of a removable transparent flow channel.
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Citations
27 Claims
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1. A method of monitoring concentration of components of blood flowing in a flowpath comprising
flowing said components through a transparent channel, directing light to said channel along an axis intersecting said channel, detecting light passing through said channel along said axis with a central detector, detecting light scattered off of said axis with an annular detector, and determining condition of components based on said light passing along said axis and/or said light scattered off said axis, said determining involving using said central detector to determine concentration in a low range of concentration values and said annular detector to determine concentration in a high range of concentration values.
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12. Apparatus for monitoring concentration of components of blood flowing in a flowpath comprising
a transparent channel, a source of light positioned to direct light to said channel along an axis intersecting said channel, a central light detector positioned to detect said light passing through said channel along said axis and provide a central signal indicating said passing light, an annular detector positioned to detect said light scattering off of said axis and provide an annular signal indicating said scattered light, and a calculator connected to receive said central signal and said annular signal from said central and annular detectors and to determine conditions of components based upon said central signal and/or said annular signal, said calculator using said central signal to determine concentration in a low range of concentration values and said annular signal to determine concentration in a high range of concentration values.
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23. Apparatus for monitoring concentration of components of blood flowing in a flowpath comprising
a removable transparent channel comprising a rigid plastic cuvette made of optically clear transparent material permanently connected to flexible plastic tubing of a disposable tube set, a channel engager having a recess for removably receiving said channel, a source of light positioned to direct light to said plastic cuvette along an axis intersecting said plastic cuvette when mounted in said recess, a light detector positioned to detect said light passing through said plastic cuvette when mounted in said recess, and a movable cover movable between an open position in which said plastic cuvette can be placed in said recess and a closed position in which ambient light is blocked from said detector via said cover, said cover enclosing said cuvette within it when in said closed position, said cover including means for guiding said cuvette into a predetermined position aligned with said source of light and said detector as said cover is moved to said closed position and means for holding said cuvette in said position.
Specification