Apparatus and method for use in measuring a compositional parameter of blood
First Claim
1. A sensor cassette for use in measuring a compositional parameter of blood comprising:
- a housing having a wall defining a passage which is adapted to receive blood, said wall being at least somewhat permeable to the compositional parameter of blood;
a support element carried by a region of said wall;
said support element being less permeable to the compositional parameter of blood than said housing;
a sensor carried by the support element, said sensor providing a signal in response to the compositional parameter of blood; and
said support element separating the sensor from at least a portion of said region of the wall whereby the effect of the permeability of the housing to the compositional parameter of blood on said signal is reduced.
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Accused Products
Abstract
A sensor cassette for use in measuring a compositional parameter of blood comprising a housing having a wall defining a passage which is adapted to receive blood. The wall is at least somewhat permeable to the compositional parameter. A support element, which is less permeable to the compositional parameter of blood than the housing, is carried by a region of the wall. A sensor is carried by the support element and provides a signal in response to the compositional parameter. The support element separates the sensor from at least a portion of such region of the wall so that the affect of the permeability of the housing to the compositional parameter on the signal from the sensor is reduced.
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Citations
20 Claims
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1. A sensor cassette for use in measuring a compositional parameter of blood comprising:
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a housing having a wall defining a passage which is adapted to receive blood, said wall being at least somewhat permeable to the compositional parameter of blood; a support element carried by a region of said wall; said support element being less permeable to the compositional parameter of blood than said housing; a sensor carried by the support element, said sensor providing a signal in response to the compositional parameter of blood; and said support element separating the sensor from at least a portion of said region of the wall whereby the effect of the permeability of the housing to the compositional parameter of blood on said signal is reduced. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A sensor cassette for use in measuring blood gas of blood from a patient comprising:
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a housing of polymeric material having a wall defining a passage, said passage being adapted to receive blood; a support element carried by a region of said wall; said support element being substantially impermeable to blood gases; and a sensor carried by the support element and physically separated from said region of said wall by said support element, said sensor being in a position to be contacted by blood gas from blood which is received in the passage, said sensor providing a signal in response to the concentration of blood gas. - View Dependent Claims (11, 12, 13, 14)
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15. A sensor cassette for use in measuring blood gas of blood from a patient comprising:
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a housing having a wall of polymeric material defining a passage, said passage being adapted to receive blood; said wall having a cavity opening into said passage; a support element in said cavity which is less permeable to blood gas than the polymeric material, said support element terminating outwardly in a support surface; and a sensor carried by the support element on said support surface, said sensor being capable of providing a signal in response to the concentration of the blood gas. - View Dependent Claims (16, 17, 18, 19)
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20. A sensor cassette for use in measuring blood gas of blood from a patient comprising:
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a housing having a wall of a transparent polycarbonate material defining a passage, said passage being adapted to receive blood; said wall having a cavity which does not extend all the way through the wall, said cavity opening into said passage; a support element in said cavity which is less permeable to blood gas than the wall of polycarbonate material, said support element terminating outwardly in a support surface; and a fluorescent sensor carried by the support element on said support surface, said sensor being capable of providing a fluorescent signal in response to the concentration of blend gas, and the support element being transparent to said fluorescent signal.
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Specification