Reciprocating delivery of fluids to the body with analyte concentration monitoring
First Claim
1. A method comprising:
- delivering a volume of a therapeutic fluid from a reservoir in a patch unit into a subcutaneous compartment of a user via a first conduit and a cannula inserted within the subcutaneous compartment, the delivering occurring under the influence of a pumping mechanism in the patch unit that operates to displace the therapeutic fluid in a forward direction;
suspending delivery of the therapeutic fluid by setting the pumping mechanism in a substantially static state such that the therapeutic fluid achieves at least a partial analyte concentration equilibrium with interstitial fluids in the subcutaneous compartment by transport of an analyte from interstitial fluids in the subcutaneous compartment to the therapeutic fluid;
withdrawing at least part of the volume of the therapeutic fluid out of the subcutaneous compartment and into the patch unit via the cannula and a second conduit separate from the first conduit by operating the pumping mechanism to displace the at least part of the volume in a reverse direction;
measuring an analyte concentration in the withdrawn volume using a sensing element within the patch unit; and
providing regulation means for preventing the withdrawn volume from entering the reservoir while allowing the therapeutic fluid to exit from the reservoir.
3 Assignments
0 Petitions
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A volume of an analyte-enriched fluid can be withdrawn out of a user'"'"'s subcutaneous compartment using a patch unit that includes a reversible pumping mechanism. The volume can be withdrawn out of the body and into the patch unit through a cannula inserted into the subcutaneous compartment so that an analyte concentration in the volume can be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.
42 Citations
22 Claims
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1. A method comprising:
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delivering a volume of a therapeutic fluid from a reservoir in a patch unit into a subcutaneous compartment of a user via a first conduit and a cannula inserted within the subcutaneous compartment, the delivering occurring under the influence of a pumping mechanism in the patch unit that operates to displace the therapeutic fluid in a forward direction; suspending delivery of the therapeutic fluid by setting the pumping mechanism in a substantially static state such that the therapeutic fluid achieves at least a partial analyte concentration equilibrium with interstitial fluids in the subcutaneous compartment by transport of an analyte from interstitial fluids in the subcutaneous compartment to the therapeutic fluid; withdrawing at least part of the volume of the therapeutic fluid out of the subcutaneous compartment and into the patch unit via the cannula and a second conduit separate from the first conduit by operating the pumping mechanism to displace the at least part of the volume in a reverse direction; measuring an analyte concentration in the withdrawn volume using a sensing element within the patch unit; and providing regulation means for preventing the withdrawn volume from entering the reservoir while allowing the therapeutic fluid to exit from the reservoir. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A patch unit for delivering a therapeutic fluid to a user and measuring a level of analyte in a user, the patch unit comprising:
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a cannula having an insertable end configured for insertion into a subcutaneous compartment of the user; a reservoir in fluid communication with the cannula, the reservoir comprising a therapeutic fluid; a pumping mechanism that; operates to displace the therapeutic fluid in a forward direction to deliver a volume of the therapeutic fluid from the reservoir into the subcutaneous compartment via a first conduit and the cannula, suspends delivery of the therapeutic fluid to the subcutaneous compartment by entering a substantial static state such that the therapeutic fluid achieves at least a partial analyte concentration equilibrium with interstitial fluids in the subcutaneous compartment by transport of an analyte from interstitial fluids in the subcutaneous compartment to the therapeutic fluid, and operates to displace the therapeutic fluid in a reverse direction to withdraw at least part of the volume of the therapeutic fluid out of the subcutaneous compartment and into the patch unit via the cannula and a second conduit separate from the first conduit, a sensing element that measures an analyte concentration in the at least part of the volume of the therapeutic fluid withdrawn from the subcutaneous compartment; and regulation means for preventing the withdrawn volume from entering the reservoir while allowing the therapeutic fluid to exit from the reservoir. - View Dependent Claims (20, 21, 22)
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Specification