Holographic occlusion detection system for infusion pumps
First Claim
1. A system, comprising:
- a sensor having a sensing portion configured to deform as pressure changes inside the sensor;
a holographic label affixed to the sensing portion of the sensor, the holographic label being deformable to deform with the sensing portion as the pressure changes inside the sensor;
a light source configured to shine light onto the holographic label in which the light from the light source is polychromatic light; and
a photodetector oriented to detect the light reflected from the holographic label.
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Accused Products
Abstract
A holographic occlusion detection system has a white-light holographic label placed onto a sensing portion or surface of a pressure sensor connected to infusion tubing. The pressure sensor at the sensing portion can have a relatively thin wall section and may be wider and flatter than a normal cross section of the infusion tubing. The label is then illuminated by a polychromatic light source, and the light reflected off the holographic label is then received by a photodetector. Pressure changes within the tubing cause a change in orientation of the white-light holographic label, thereby resulting in a shift in the peak wavelength of the reflective light sensed by the photodetector. This shift in wavelength can then be calibrated to the swelling of the sensing portion so that pressure within the infusion line can be calculated. In another variation, monochromatic light is reflected off a holographic label, and pressure changes are detected by measuring the amplitude of the reflected light.
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Citations
36 Claims
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1. A system, comprising:
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a sensor having a sensing portion configured to deform as pressure changes inside the sensor; a holographic label affixed to the sensing portion of the sensor, the holographic label being deformable to deform with the sensing portion as the pressure changes inside the sensor; a light source configured to shine light onto the holographic label in which the light from the light source is polychromatic light; and a photodetector oriented to detect the light reflected from the holographic label. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A method, comprising:
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shining polychromatic light onto a holographic label, wherein the holographic label includes diffraction grating lines being uniformly spaced to linearly affect frequency of the light reflected from the holographic label; detecting light reflected off the holographic label disposed on a pressure sensor that deforms as pressure changes inside the pressure sensor; and determining the pressure inside the pressure sensor based on a property of the light reflected off the holographic label, wherein said determining the pressure inside the pressure sensor includes measuring the frequency of the light reflected from the holographic label. - View Dependent Claims (19, 20, 21, 22, 23)
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24. A system, comprising:
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a sensor having a sensing portion configured to deform as pressure changes inside the sensor in which the sensor has a cylindrical shape; a holographic label affixed to the sensing portion of the sensor in which the holographic label wraps completely around the sensor, the holographic label being deformable to deform with the sensing portion as the pressure changes inside the sensor; a light source configured to shine light onto the holographic label; and a photodetector oriented to detect the light reflected from the holographic label. - View Dependent Claims (25)
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26. A system, comprising:
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a sensor having a sensing portion configured to deform as pressure changes inside the sensor in which the sensor has a cylindrical shape; a holographic label affixed to the sensing portion of the sensor in which the holographic label includes diffraction grating lines that extend parallel to a fluid flow path in the sensor, the holographic label being deformable to deform with the sensing portion as the pressure changes inside the sensor; a light source configured to shine light onto the holographic label; and a photodetector oriented to detect the light reflected from the holographic label.
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27. A system, comprising:
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a sensor having a sensing portion configured to deform as pressure changes inside the sensor; a holographic label affixed to the sensing portion of the sensor, the holographic label being deformable to deform with the sensing portion as the pressure changes inside the sensor, wherein the holographic label has a unique optical signature, wherein the unique optical signature includes a sequence of colors reflected from the holographic label; a light source configured to shine light onto the holographic label; and a photodetector oriented to detect the light reflected from the holographic label. - View Dependent Claims (28, 29, 30, 31, 32)
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33. A system, comprising:
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a sensor having a sensing portion configured to deform as pressure changes inside the sensor; a holographic label affixed to the sensing portion of the sensor, the holographic label being deformable to deform with the sensing portion as the pressure changes inside the sensor, wherein the holographic label has a unique optical signature; a light source configured to shine light onto the holographic label; a photodetector oriented to detect the light reflected from the holographic label; and an infusion pump operatively coupled to the photodetector, the infusion pump being configured to calibrate to known pressure levels based on the unique holographic signature. - View Dependent Claims (34, 35, 36)
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Specification