Reciprocating Delivery Of Fluids To The Body With Analyte Concentration Monitoring
First Claim
1. An apparatus comprising:
- a patch unit having a skin contact surface;
a cannula having an insertable end that protrudes from the skin contact surface for insertion into a subcutaneous compartment of a user;
a detector system;
a reversible pumping mechanism for displacing fluid through the cannula; and
a control processor that controls the pumping mechanism such that the reversible pumping mechanism is configured to draw a volume of analyte-enriched fluid from the subcutaneous compartment into a sampling space and then to reverse the volume of fluid to the subcutaneous compartment after the detector system quantifies a concentration of at least one analyte in the sampling space.
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Accused Products
Abstract
A volume of an analyte-enriched fluid can be withdrawn out of a user'"'"'s subcutaneous compartment using a patch unit that includes a reversible pumping mechanism. The volume can be withdrawn out of the body and into the patch unit through a cannula inserted into the subcutaneous compartment so that an analyte concentration in the volume can be measured using a sensing element within the patch unit. After analyte concentration analysis, at least the volume can be delivered back into the subcutaneous compartment by operating the pumping mechanism in a forward direction. biologically compatible fluid can optionally be pumped into the subcutaneous compartment from a reservoir in the patch unit and then allowed to partially or completely equilibrate with the analyte concentration in the interstitial fluid of the subcutaneous compartment via a permeable or semi-permeable cannula surface before being drawn back into the patch unit for analysis. Related systems, apparatus, methods, and/or articles are also described.
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Citations
27 Claims
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1. An apparatus comprising:
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a patch unit having a skin contact surface; a cannula having an insertable end that protrudes from the skin contact surface for insertion into a subcutaneous compartment of a user; a detector system; a reversible pumping mechanism for displacing fluid through the cannula; and a control processor that controls the pumping mechanism such that the reversible pumping mechanism is configured to draw a volume of analyte-enriched fluid from the subcutaneous compartment into a sampling space and then to reverse the volume of fluid to the subcutaneous compartment after the detector system quantifies a concentration of at least one analyte in the sampling space. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A method comprising:
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withdrawing a volume of an analyte-enriched fluid out of a subcutaneous compartment of a user of a patch unit, the withdrawing occurring under the influence of a pumping mechanism in the patch unit, the pumping mechanism operating to displace the volume in a reverse direction, the volume being withdrawn out of the subcutaneous compartment and into the patch unit through a cannula inserted within the subcutaneous compartment; measuring an analyte concentration in the volume using a sensing element within the patch unit; and delivering at least the volume back into the subcutaneous compartment by operating the pumping mechanism to displace at least the volume in a forward direction. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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Specification