Device for determining the concentration of at least one substance in organic tissue
First Claim
1. A device for determining a concentration of at least one substance in organic tissue, comprisinga subcutaneous needle which is insertable into said organic tissue,a microprocessor and a sensing unit means which is connected to said microprocessor for determining the concentration of said substance to be determined and at least one endogenous or exogenous marker variable of a perfusion fluid,a pumping and suction unit means for feeding said perfusion fluid into said subcutaneous needle and for draining said perfusion fluid after partial equilibration with said at least one substance, said pumping and suction unit means being controlled by said microprocessor,replaceable metering ampoules sealed with membranes containing said perfusion fluid, a calibrating solution and at least one drug, and drive unit means for actuating metering plungers of said metering ampoules, said drive unit means controlled by said microprocessor, and wherein said metering ampoules communicate with a master capillary leading from said pumping and suction unit means to said subcutaneous needle, communication being established via capillary tubes piercing said membranes of said metering ampoules.
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Accused Products
Abstract
A device for determining the concentration of at least one substance in organic tissue includes a subcutaneous needle for insertion into the tissue and a pumping and suction unit which is controlled by a microprocessor and is used for delivering a perfusion fluid and draining it after its partial equilibration with the tissue. The device further includes a sensing unit connected to the microprocessor for determining the concentration of the substance to be analyzed and one or more marker variables. The perfusion fluid, a calibrating solution and at least one drug are provided in replaceable metering ampoules sealed with membranes, whose metering plungers can be actuated by a drive unit controlled by the microprocessor. The metering ampoules communicate with a master capillary leading from the pumping and suction unit to the subcutaneous needle; communication is established via capillary tubes piercing the membranes.
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Citations
13 Claims
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1. A device for determining a concentration of at least one substance in organic tissue, comprising
a subcutaneous needle which is insertable into said organic tissue, a microprocessor and a sensing unit means which is connected to said microprocessor for determining the concentration of said substance to be determined and at least one endogenous or exogenous marker variable of a perfusion fluid, a pumping and suction unit means for feeding said perfusion fluid into said subcutaneous needle and for draining said perfusion fluid after partial equilibration with said at least one substance, said pumping and suction unit means being controlled by said microprocessor, replaceable metering ampoules sealed with membranes containing said perfusion fluid, a calibrating solution and at least one drug, and drive unit means for actuating metering plungers of said metering ampoules, said drive unit means controlled by said microprocessor, and wherein said metering ampoules communicate with a master capillary leading from said pumping and suction unit means to said subcutaneous needle, communication being established via capillary tubes piercing said membranes of said metering ampoules.
Specification