System and Method for Measuring Delivered Dose
First Claim
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1. A flow sensor system comprising:
- a durable portion comprisingan outer housing having a first opening to receive an injection device, and a second opening at an opposite end to receive a semi-disposable portion;
a durable portion electrical connector;
a memory;
a battery;
a processor for receiving and processing signals received from the semi-disposable portion, and for driving the wireless transceiver to send and receive communication signals from the remote device;
a semi-disposable portion comprising;
a first end having a cannula adapted to pierce a septum of the injection device and a female thread adapted to engage a male thread feature of the injection device;
a second end opposite the first end having a male pen needle thread and septum adapted to receive a pen needle;
a printed circuit board having mounted thereon a flow sensor chip;
a manifold in fluid communication with the cannula and the septum, the manifold comprising a continuous flow channel extending from the first end cannula to a chamber adjacent the second end septum, the flow channel comprising an opening to receive a sensor; and
a semi-disposable portion electrical connector for electrical connection to the durable portion electrical connector;
wherein the flow sensor chip comprises a sensing surface adapted to be received in the flow channel opening and exposed within the flow channel;
the sensor surface having a heating element and at least one sensing element downstream of the heating element.
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Abstract
A flow sensor is provided to enable volumetric dose data to be acquired automatically by sampling flow rates of insulin measured by a flow sensor exposed to a flow manifold though which the insulin flows. The flow sensor preferably connects to a standard insulin pen on one end, and to a standard pen needle on the other end. Particular geometries and algorithms are utilized to accommodate the unique requirements of insulin flow determination during an injection event.
51 Citations
29 Claims
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1. A flow sensor system comprising:
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a durable portion comprising an outer housing having a first opening to receive an injection device, and a second opening at an opposite end to receive a semi-disposable portion; a durable portion electrical connector; a memory; a battery; a processor for receiving and processing signals received from the semi-disposable portion, and for driving the wireless transceiver to send and receive communication signals from the remote device; a semi-disposable portion comprising; a first end having a cannula adapted to pierce a septum of the injection device and a female thread adapted to engage a male thread feature of the injection device; a second end opposite the first end having a male pen needle thread and septum adapted to receive a pen needle; a printed circuit board having mounted thereon a flow sensor chip; a manifold in fluid communication with the cannula and the septum, the manifold comprising a continuous flow channel extending from the first end cannula to a chamber adjacent the second end septum, the flow channel comprising an opening to receive a sensor; and a semi-disposable portion electrical connector for electrical connection to the durable portion electrical connector; wherein the flow sensor chip comprises a sensing surface adapted to be received in the flow channel opening and exposed within the flow channel;
the sensor surface having a heating element and at least one sensing element downstream of the heating element. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 15)
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14. A method of measuring a dose of medicament delivered through a cannula with a sensor comprising a heating element and a first pair of sensing elements comprising an upstream sensing element and a downstream sensing element, the pair of sensing elements spaced at a first offset distance equidistantly upstream and downstream of the heating element, comprising the steps of:
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generating a heating signal with the heating element; detecting the beginning of medicament flow by sensing a difference in signals received from the upstream and downstream sensing elements; periodically sampling the upstream and downstream sensing elements to measure instantaneous flow rates; determining an end of medicament flow; determining a dose volume based on a plurality of sampled instantaneous flow rates; and storing the determined dose volume in a memory unit. - View Dependent Claims (16, 17, 18, 19, 20)
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21. A medicament flow sensor comprising:
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a manifold comprising a flow channel extending between an inlet and an outlet; a sensor comprising a sensor face having; a heating element; and a first pair of sensing elements spaced equidistantly upstream and downstream of the heating element; wherein the sensor face is exposed to fluid in the flow channel, and is substantially flush with or proud of a manifold surface of the flow channel. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29)
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Specification