Abstract:
A device and method are provided for use with a noninvasive optical measurement system, such as a thermal gradient spectrometer, for improved determination of analyte concentrations within living tissue. In one embodiment, a wearable window (100) is secured to a patient's forearm thereby isolating a measurement site on the patient's skin for determination of blood glucose levels. The wearable window (100) effectively replaces a window of the spectrometer, and thus forms an interface between the patient's skin and a thermal mass window of the spectrometer. When the spectrometer must be temporarily removed from the patient's skin, such as to allow the patient mobility, the wearable window (100) is left secured to the forearm so as to maintain a consistent measurement site on the skin. When the spectrometer is later reattached to the patient, the wearable window (100) will again form an interface between the spectrometer and the same location of skin as before.
Abstract:
In accordance with one embodiment there is provided a method of providing a known spectrum to a noninvasive optical detection system of the type having a window for receiving infrared energy. The method comprises affixing a standard to the window. The standard comprises a body formed from a material having known and stable spectral properties. The method further comprises placing at least a portion of the body directly against the window, and operating the optical detection system to detect an emission spectrum of the body. In accordance with another embodiment an infrared spectrometer comprises a window for receiving infrared energy. The window has an exposed surface. The infrared spectrometer further comprises a standard comprising a body formed of a material having known and stable spectral properties. At least part of the body is removably disposed directly against the exposed surface of the window.
Abstract:
An analyte concentration monitoring system having network-based communication features (600) which provide a link between an analyte detection system (602) and a centralized computer (604). The analyte detection system has a processor (610) that calculates analyte concentration in accordance with software (612) executable by the processor. Under certain conditions, the software (612) needs to be updated. Accordingly, when the analyte detection system is connected to the centralized computer, the centralized computer determines whether a software update (614) is needed. If a software update is needed, then the centralized computer conveniently provides the software update to the analyte detection system without intervention from a user.
Abstract:
A device and method are provided for use with a non-invasive optical measurement system. A site selector (100) is secured to a patient's forearm, such as by a fastening strap (112), thereby isolating a measurement site on the patient's skin for determination of blood glucose levels. The site selector attaches to a thermal mass window of the spectrometer and thus forms an interface between the patient's skin and the thermal mass window. Protrusions (108, 108') and raised sections (110, 110') can facilitate the attachment. When the spectrometer must be temporarily removed from the patient's skin the site selector is left secured to the forearm so as to maintain a consistent measurement site on the skin. When the spectrometer is later reattached to the patient, the site selector will again form an interface between the gradient spectrometer and the same location of skin as before.
Abstract:
A device and method for selecting and stabilizing proper sites for the measurement of the concentration of an analyte, for example glucose, within the tissue of a subject or patient are disclosed. One embodiment of the device (440) immobilizes the subject's forearm (462) and finger (460), thereby stabilizing measurement sites thereon for exposure to a noninvasive monitor which captures analyte concentration data within the subject's skin. The method involves the choice of a location on the subject's body at which to take the analyte measurement, preferably based on the amount of time that has elapsed since the last time the subject ate.
Abstract:
A reagentless whole-blood analyte detection system (200, 400, 450, 1000, 1100) that is capable of being deployed near a patient has a source (220) capable of emitting a beam of radiation that includes a spectral band. The whole-blood system (200, 400, 450, 1000, 1100) also has at least one detector (250, 1152, 1154) in an optical path of the beam. The whole-blood system (200, 400, 450, 1000, 1100) also has a housing (402, 452) that is configured to house the source (220) and the detector(s) (250, 1152, 1154). The whole-blood system (200, 400, 450, 1000, 1100) also has a sample element (240, 305, 605, 805, 885, 905, 1040, 1205, 1305, 1355, 1405) that is situated in the optical path of the beam. The sample element (240, 305, 605, 805, 885, 905, 1040, 1205, 1305, 1355, 1405) has a sample cell (242, 310, 610, 810) and a sample cell wall (244, 330, 335) that does not eliminate transmittance of the beam of radiation in the spectral band.
Abstract:
A method calibrates a monitor (100) that comprises a non-invasive blood constituent monitor (102) and a traditional measurement system (116). The non-invasive blood constituent monitor includes a thermal gradient inducing element (110) an analyzer window (108). A traditional monitor output representing a property of a blood constituent is generated by the traditional measurement system (116). A non-invasive monitor output representing the property of the whole blood constituent is generated by the non-invasive constituent monitor (102). The traditional monitor output and the non-invasive monitor output is corrected by the amount of error.
Abstract:
A device and method are provided for use with a noninvasive optical measurement system, such as a thermal gradient spectrometer, for improved determination of analyte concentrations within living tissue. In one embodiment, a wearable window is secured to a patient's forearm thereby isolating a measurement site on the patient's skin for determination of blood glucose levels. The wearable window effectively replaces a window of the spectrometer, and thus forms an interface between the patient's skin and a thermal mass window of the spectrometer. When the spectrometer must be temporarily removed from the patient's skin, such as to allow the patient mobility, the wearable window is left secured to the forearm so as to maintain a consistent measurement site on the skin. When the spectrometer is later reattached to the patient, the wearable window will again form an interface between the spectrometer and the same location of skin as before.
Abstract:
A device and method for selecting and stabilizing proper sites for the measurement of the concentration of an analyte, for example glucose, within the tissue of a subject or patient are disclosed. One embodiment of the device immobilizes the subject's forearm and finger, thereby stabilizing measurement sites thereon for exposure to a noninvasive monitor which captures analyte concentration data within the subject's skin. The method involves the choice of a location on the subject's body at which to take the analyte measurement, preferably based on the amount of time that has elapsed since the last time the subject ate.
Abstract:
An analyte concentration monitoring system having network-based communication features (600) which provide a link between an analyte detection system (602) and a centralized computer (604). The analyte detection system has a processor (610) that calculates analyte concentration in accordance with software (612) executable by the processor. Under certain conditions, the software (612) needs to be updated. Accordingly, when the analyte detection system is connected to the centralized computer, the centralized computer determines whether a software update (614) is needed. If a software update is needed, then the centralized computer conveniently provides the software update to the analyte detection system without intervention from a user.