Oxygen sensing membranes and methods of making same
First Claim
1. A method of preparing a polymeric sensing composition containing a luminescent dye and a light transmissive, oxygen permeable matrix material, comprising the steps of:
- a. selecting a luminescent dye of incorporation in said polymeric sensing composition;
b. determining a desired oxygen permeability (PermO2) range for said matrix material which will provide a Stem-Volmer constant in a desired range for said polymeric sensing composition; and
c. preparing said light-transmissive, oxygen permeable matrix material having a glass transition temperature of approximately −
40°
C. or approximately 110°
C. by i. selecting a first homopolymer comprised of first monomeric units said first homopolymer having a first PermO2 value;
ii. selecting a second homopolymer having a second PermO2 value that is different than said first PermO2 value;
iii. copolymerizing said first and second monomeric units to obtain a copolymer having an intermediate PermO2 values, said intermediate PermO2 sufficient to provide a Stern-Volmer constant within said desired range of Stem-Volmer constants;
iv. incorporating said luminescent dye in said copolymer; and
v. incorporating a scattering filler material in said copolymer.
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Accused Products
Abstract
Optical sensor formulations comprising polymeric sensing formulations and methods of predictably making optical sensor formulations, for, e.g., measuring O2 levels in patient blood samples. These formulations may be, e.g., deposited as a membrane on light-transmissive substrates. In an embodiment, O2-sensing formulations may be made by a process including selecting a first homopolymer comprised of first monomeric units, the first homopolymer having a first PermO2 value; selecting a second homopolymer comprised of second monomeric units, the second homopolymer having a second PermO2 value that is different from the first PermO2 value; and copolymerizing the first and second monomeric units to obtain a copolymer having an intermediate PermO2 value, i.e., between the two PermO2 values, the intermediate PermO2 providing the desired PermO2 for the desired oxygen sensing formulation. By adjusting the relative amounts of the first and second monomeric units, a series of polymers having a desired range of intermediate permeability values (and hence Stem-Volmer characteristic kSV values) may be obtained.
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Citations
28 Claims
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1. A method of preparing a polymeric sensing composition containing a luminescent dye and a light transmissive, oxygen permeable matrix material, comprising the steps of:
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a. selecting a luminescent dye of incorporation in said polymeric sensing composition;
b. determining a desired oxygen permeability (PermO2) range for said matrix material which will provide a Stem-Volmer constant in a desired range for said polymeric sensing composition; and
c. preparing said light-transmissive, oxygen permeable matrix material having a glass transition temperature of approximately −
40°
C. or approximately 110°
C. byi. selecting a first homopolymer comprised of first monomeric units said first homopolymer having a first PermO2 value;
ii. selecting a second homopolymer having a second PermO2 value that is different than said first PermO2 value;
iii. copolymerizing said first and second monomeric units to obtain a copolymer having an intermediate PermO2 values, said intermediate PermO2 sufficient to provide a Stern-Volmer constant within said desired range of Stem-Volmer constants;
iv. incorporating said luminescent dye in said copolymer; and
v. incorporating a scattering filler material in said copolymer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of preparing a light-transmissive, oxygen-permeable matrix material for use in a polymeric sensing composition, comprising the steps of:
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a. determining a desired oxygen permeability (PermO2) range for said matrix material which will provide a desired range of Stern-Volmer constants for said polymeric sensing composition;
b. selecting a first homopolymer comprised of first monomeric units, said first homopolymer having a first PermO2 value;
c. selecting a second homopolymer comprised of second monomeric units, said second homopolymer having a second PermO2 value that is different than said first PermO2 value; and
d. preparing a copolymer having an intermediate PermO2 value between said first and second PermO2 values by copolymerizing said first and second monomeric units in a ratio to obtain said copolymer, said intermediate PermO2 value providing a Stern-Volmer constant within said desired range of Stern-Volmer constants wherein said copolymer contains a scattering filler material to form the polymeric sensing composition having a glass transition temperature of approximately −
40°
C. or approximately 110°
C.- View Dependent Claims (11, 12)
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13. An oxygen sensor formulation comprising:
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a. a luminescent dye; and
b. a light transmissive, oxygen permeable matrix material having a desired oxygen-permeability (PermO2) which provides a Stern-Volmer constant in a desired range for a polymeric sensing composition, made by the process of;
i. selecting a first homopolymer comprised of first monomeric units, said first homopolymer having a first PermO2 value;
ii. selecting a second homopolymer having a second PermO2 value that is different that said first PermO2 value;
iii. copolymerizing said first and second monomeric units to obtain a copolymer having a glass transition temperature of approximately −
40°
C. or approximately 110°
C. and having an intermediate PermO2 value between said first and second PermO2 values, said intermediate PermO2 providing said desired Stem-Volmer constant in said range; and
iv. including a scattering filler material in said copolymer. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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Specification