Abstract:
The invention relates to a method and a device for determining the glucose concentration in tissue liquid (40). Said method and device are used for detecting (sensor 12) measured values for glucose and an endogenous reference substance in a sample liquid (42) obtained by means of microdialysis, microperfusion, or ultrafiltration (probe 10) and correcting the glucose value in accordance with the measured value for the reference substance. The invention is characterized in that the glucose recovery rate is determined from a non-linear correlation with the recovery rate for the ionic reference substance while the measured value for glucose is corrected therewith. Furthermore, the lactate concentration and/or pyruvate concentration is/are used as (an) additional reference substance(s) in the sample liquid to make further corrections.
Abstract:
The invention relates to a piercing system for removing bodily fluid from the skin of a human or animal. Said system comprises a disposable piercing unit (1), which contains a needle element (6) for puncturing the skin, a piercing device (2), which encompasses a piercing drive (4), said drive propelling a piercing displacement of the piercing unit (1), which is coupled to the piercing drive (4) by means of a coupling mechanism (3), a predefined value of the piercing depth being guaranteed using a piercing depth reference element (10), which comprises a skin contact surface (11) and the predefined value of the piercing depth being determined by the distance in the piercing direction between the skin contact surface (11) and the position of the needle tip at the inversion point of the piercing displacement. The piercing depth reference element (10) is connected to the needle element (6) and coupled to the drive in such a way that it is displaced together with the needle element (1) during at least one part of the propulsion phase and has a defined longitudinal position in the piercing direction in relation to the needle element (6), at least at the inverse point of the piercing displacement.
Abstract:
The invention relates to a method for evaluating a set of measurement data from an oral glucose tolerance test, wherein the set of measurement data contains a sequence of measurement data of the glucose concentration and, in addition, at least one sequence of measured values of a further analyte concentration. Provision is made according to the invention that, from the sequence of measured values of the glucose concentration and from in each case one of several predefined glucose sample profiles, in each case a value of a similarity measure is calculated that quantifies the similarity between the time profile of the sequence of measured values of the glucose concentration and the relevant glucose sample profile, and, from the sequence of measured values of the further analyte concentration and from several predefined analyte sample profiles, in each case a value of a further similarity measure is calculated that quantifies the similarity between the profile of the sequence of measured values of the further analyte concentration and the relevant analyte sample profile, the set of data is characterized, in a vector space having coordinate axes formed from the similarity measures, by a point whose coordinates contain the calculated values of the similarity measures, and the position of this point in relation to reference points that each represent a defined state of health is evaluated, in order to calculate a parameter that indicates the state of the glucose metabolism of the patient.
Abstract:
The invention relates to a piercing system for removing bodily fluid from the skin of a human or animal. Said system comprises a disposable piercing unit (1), which contains a needle element (6) for puncturing the skin, a piercing device (2), which encompasses a piercing drive (4), said drive propelling a piercing displacement of the piercing unit (1), which is coupled to the piercing drive (4) by means of a coupling mechanism (3), a predefined value of the piercing depth being guaranteed using a piercing depth reference element (10), which comprises a skin contact surface (11) and the predefined value of the piercing depth being determined by the distance in the piercing direction between the skin contact surface (11) and the position of the needle tip at the inversion point of the piercing displacement. The piercing depth reference element (10) is connected to the needle element (6) and coupled to the drive in such a way that it is displaced together with the needle element (1) during at least one part of the propulsion phase and has a defined longitudinal position in the piercing direction in relation to the needle element (6), at least at the inverse point of the piercing displacement.
Abstract:
The electrode system comprises a counter electrode (2) with an electric conductor, a working electrode (1) with an electric conductor on which an enzyme layer is arranged that consists of immobilized enzyme molecules for catalytic transformation of analytes, and a diffusion brake, which slows down the diffusion of the analytes from body fluid surrounding the electrode system, to enzyme molecules. The enzyme layer is formed in the form of several fields that are arranged to each other on the conductor of the working electrode in an interval. The electrode system comprises a counter electrode (2) with an electric conductor, a working electrode (1) with an electric conductor on which an enzyme layer is arranged that consists of immobilized enzyme molecules for catalytic transformation of analytes, and a diffusion brake, which slows down the diffusion of the analytes from body fluid surrounding the electrode system, to enzyme molecules. The enzyme layer is formed in the form of several fields that are arranged to each other on the conductor of the working electrode in an interval. The two of the fields of the enzyme layer of 5 mm are removed from one another. An interval between adjoining fields of the enzyme layer is 0.3 mm. The fields of the enzyme layer of 2 mm extend itself in two directions vertical to each other. The diffusion brake is formed as a layer covering the enzyme layer. The enzyme cooperates with a catalytic redox mediator that reduces or prevents an oxygen dependence of the catalytic conversion of the analytes. The catalytic redox mediator transfers hydrogen peroxide and causes a direct electron transfer. The electrode system is bent without breaking around 90[deg] . The working electrode comprises a spacer that is arranged by the conductor over the enzyme layer. The spacer covers the working electrode and the counter electrode as solid layer. The electric conductors of the working electrode and the counter electrode are arranged on a substrate (4). The conductor of the working electrode has narrow positions between the enzyme layer fields and the conductor of the counter electrode has contour following the progress of the conductor of the working electrode. An independent claim is included for a sensor with electrode system.
Abstract:
The recovery device has a lancet (1), which has a lancet body (2) with two tips (3). The tips have different lengths. The device has a selection unit for a tip, so that pricking is carried out with definite penetrating depth in a body part, where the body part is arranged opposite to the device, depending on the length of the selected tip. The pricking is not done with the non-selected tip. The two tips are arranged in different directions at the lancet body, in a star forming linear manner. The device has a drive unit for moving the lancet. An independent claim is also included for a lancet, which has a lancet body with two tips, having different lengths.
Abstract:
The invention relates to a method and a device for determining the glucose concentration in tissue liquid (40). Said method and device are used for detecting (sensor 12) measured values for glucose and an endogenous referenc e substance in a sample liquid (42) obtained by means of microdialysis, microperfusion, or ultrafiltration (probe 10) and correcting the glucose val ue in accordance with the measured value for the reference substance. The invention is characterized in that the glucose recovery rate is determined from a non-linear correlation with the recovery rate for the ionic reference substance while the measured value for glucose is corrected therewith. Furthermore, the lactate concentration and/or pyruvate concentration is/are used as (an) additional reference substance(s) in the sample liquid to make further corrections.
Abstract:
The invention relates to a piercing system for removing bodily fluid from th e skin of a human or animal. Said system comprises a disposable piercing unit (1), which contains a needle element (6) for puncturing the skin, a piercing device (2), which encompasses a piercing drive (4), said drive propelling a piercing displacement of the piercing unit (1), which is coupled to the piercing drive (4) by means of a coupling mechanism (3), a predefined value of the piercing depth being guaranteed using a piercing depth reference element (10), which comprises a skin contact surface (11) and the predefined value o f the piercing depth being determined by the distance in the piercing directio n between the skin contact surface (11) and the position of the needle tip at the inversion point of the piercing displacement. The piercing depth referen ce element (10) is connected to the needle element (6) and coupled to the drive in such a way that it is displaced together with the needle element (1) duri ng at least one part of the propulsion phase and has a defined longitudinal position in the piercing direction in relation to the needle element (6), at least at the inverse point of the piercing displacement.
Abstract:
Sistema de electrodos para medir la concentración de un analito bajo condiciones in vivo, que comprendeun contraelectrodo (2) que presenta un conductor eléctrico (2a), un electrodo de trabajo (1) que presenta unconductor eléctrico (1a) sobre el que se aplica una capa de enzima (5) que contiene moléculas inmovilizadas deenzima para la conversión catalítica del analito, y una barrera de difusión (8) que enlentece la difusión del analitodesde el líquido corporal circundante al sistema de electrodos hasta las moléculas de enzima, caracterizado porquela capa de enzima (5) se ha diseñado en forma de múltiples campos que se disponen sobre el conductor (1a) delelectrodo de trabajo (1) separados por cierta distancia