Minnesota Mining and Manufacturing Company

William W Miller

Masao Yafuso

Henry K Hui

Cheng F Yan

Thomas G Hacker

Thomas P Maxwell

Ted H Gourley

James K Tusa

A system for determining the value of a compositional parameter of blood, including a sensor for producing a signal related to the value of the compositional parameter. A computer analyzes the signal and produces an output representing the value of the compositional parameter of blood. There is a delayed response in the system such that the signal has a time-varying waveform that varies from an initial value to an equilibrated value. The equilibrated value is predicted by detecting the occurrence of an inflection point and then computing an estimate of the equilibrated value based upon the assumption that the waveform varies exponentially from the inflection point to the equilibrated value.

System and method for predicting the value of a compositional parameter

An apparatus for sensing the concentration of a component such as oxygen in a medium such as blood. The apparatus includes an elongated signal transmitter and a sensing element at one end thereof. A substantially rigid sleeve is secured around such end to provide a pocket for the sensing element.

Sensor and method for sensing the concentration of a component in a

An apparatus comprising a supporting structure having a surface, an optical sensor for sensing a compositional blood parameter and a deformable optical coupling element carried by the supporting structure. The optical sensor is carried by the supporting structure and is responsive to an optical input signal to provide an optical output signal related to the compositional blood parameter. The optical coupling element is in a position to receive at least one of the optical signals and the optical coupling element is transmissive to such received signal.

Apparatus and assembly for use in optically sensing a compositional

A sensor comprising a sensing element capable of sensing a component in an aqueous medium and an overcoating at least partially covering the sensing element. The overcoating comprises a water insoluble, component permeable, cross-linked cellulosic material and an effective amount of an opaque agent.

Sensor with overcoating and process for making same

An apparatus for measuring the concentration of a component in a medium comprising: an optical sensor including at least one optical indicator for providing an optical signal which varies in response to the presence of a component in a medium; an optical signal fiber capable of transmitting the optical signal from the optical sensor; and a supply reservoir associated with the optical sensor and acting to provide additional optical indicator to the optical sensor.

Optical sensor

An optical sensor which is a gas permeable silicone polymeric matrix having at least one optical indicator therein for providing an optical signal in response to excitation light. The optical indicator essentially comprises a mixture of non-polar derivatives of a polynuclear aromatic compound.

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Santa Ana, CA, United States of America

William W Miller