Glucose sensor
First Claim
1. A glucose sensor, comprising:
- a catheter, having one or more openings in a region of its distal end,a first optical waveguide arranged in the catheter with a coupling surface at its distal end,a measuring probe disposed in the region of the distal end of the catheter and coupled to the coupling surface of the first optical waveguide, having a mirror disposed opposite the coupling surface of the first optical waveguide and a detection chamber between the coupling surface of the first optical waveguide and the mirror,a detection fluid for glucose in the detection chamber,a membrane, which encloses at least the detection chamber filled with the detection fluid and having a separation capacity of at most 20 kDa, anda light source coupled to the first optical waveguide, wherein the light source is an infrared light source providing light with a wavelength between 800 nm and 3000 nm.
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Accused Products
Abstract
A method for determining the glucose value in blood or in interstitial liquids and to a glucose sensor including a catheter which has one or more openings in the region of the distal end of the catheter; a first optical waveguide which is arranged in the catheter and which includes a coupling surface at the distal end of the optical waveguide; a measuring probe which is arranged in the region of the distal end of the catheter, is coupled to the coupling surface of the first optical waveguide, and has a mirror arranged opposite the coupling surface of the first optical waveguide and a detection chamber between the coupling surface of the first optical waveguide and the mirror; a detection liquid for glucose in the detection chamber; and a membrane which encloses at least the detection chamber filled with the detection liquid and which has a separation capacity of maximally 20 kDA.
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Citations
18 Claims
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1. A glucose sensor, comprising:
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a catheter, having one or more openings in a region of its distal end, a first optical waveguide arranged in the catheter with a coupling surface at its distal end, a measuring probe disposed in the region of the distal end of the catheter and coupled to the coupling surface of the first optical waveguide, having a mirror disposed opposite the coupling surface of the first optical waveguide and a detection chamber between the coupling surface of the first optical waveguide and the mirror, a detection fluid for glucose in the detection chamber, a membrane, which encloses at least the detection chamber filled with the detection fluid and having a separation capacity of at most 20 kDa, and a light source coupled to the first optical waveguide, wherein the light source is an infrared light source providing light with a wavelength between 800 nm and 3000 nm. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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- 16. A method for determining a glucose value in blood or in interstitial fluid, comprising the steps of bringing a measuring probe coupled to a coupling surface of a first optical waveguide, which comprises a mirror arranged opposite the coupling surface of the first optical waveguide and a detection chamber between the coupling surface of the first optical waveguide and the mirror, containing a detection fluid for glucose and enclosed by a membrane having a separation capacity of at most 20 kDa, into contact with the blood or the interstitial fluid, wherein the glucose depending on a concentration gradient diffuses out from the blood or the interstitial fluid into the detection fluid or from the detection fluid into the blood or the interstitial fluid, coupling light at a wavelength between 800 nm and 3000 nm into the first optical waveguide and guiding the light through the latter to the detection chamber, reflecting the light at the mirror and guiding back the light at the mirror through the first optical waveguide, while absorbing light in dependence on the glucose concentration in the detection fluid in the detection chamber, and measuring an intensity of the light returning from the detection chamber.
Specification