# US 2019/0167919 A1 · System and Method for Measuring Delivered Dose

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- Number: US 2019/0167919 A1
- Document ID: US20190167919A1
- Status: Published application
- Kind: A1
- Application number: 16/050,187
- Filed: 2018-07-31
- Published: 2019-06-06
- Earliest claimed: 2016-08-02
- Assignees: Becton, Dickinson and Company
- Applicants: Becton, Dickinson and Company
- Inventors: Gary Searle; Andrew Burke; Peter Costello; Kenneth Focht; Francis L. Ross
- Web page: https://patentgrep.com/patent/US20190167919A1

## CPC

- A61M 5/482: {Varying injection pressure, e.g. by varying speed of injection}
- A61M 5/16804: {Active flow controllers}
- A61M 5/16831: {Monitoring, detecting, signalling or eliminating infusion flow anomalies (low-level float-valves causing cut-off A61M5/40; indicating or recording presence, absence or direction of flow in general G01P13/0066)}
- A61M 5/20: Automatic syringes, e.g. with automatically actuated piston rod, with automatic needle injection, filling automatically (A61M5/142 takes precedence)
- A61M 5/3286: {Needle tip design, e.g. for improved penetration}
- A61M 2205/3331: Pressure; Flow
- A61M 2205/3569: sublocal, e.g. between console and disposable
- A61M: DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY (introducing media into or onto the bodies of animals A61D7/00; means for inserting tampons A61F13/26; devices for administering food or medicines orally A61J; containers for collecting, storing or administering blood or medical fluids A61J1/05); DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY (surgery A61B; chemical aspects of surgical articles A61L); DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR {(Electrotherapy, e.g. producing anaesthesia by the use of alternating or intermittent currents A61N1/36021)}

## 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.

## Claims

### Claim 1

A flow sensor comprising:
a housing comprising a flow channel having an input end shaped to receive a pen injection device, and an output end shaped to receive a pen needle,
a sensor comprising a sensing surface exposed within said flow channel, the sensing surface having a heating element and at least one sensing element downstream of the heating element.

### Claim 2 (depends on 1)

The flow sensor system of claim 1, wherein the flow sensing chip further comprises a second sensing element upstream of the heating element.

### Claim 3 (depends on 1)

The flow sensor system of claim 1, wherein the flow channel has a first portion with a first cross sectional area, and a second portion with a second cross sectional area, and wherein the flow sensor chip is exposed to the first flow channel portion, and a second sensor chip is exposed to the second flow channel portion.

### Claim 4 (depends on 4)

The flow sensor system of claim 4, wherein the flow sensing chip further comprises a secondary pair of sensing elements spaced equidistantly from the heating element at a second distance upstream and downstream of the heating element, the second distance being different than the distance from the heating element to the at least one sensing element and the second sensing element.

### Claim 5 (depends on 1)

The flow sensor system of claim 1, wherein the heating element and the sensing element are electrically connected to an electrical connector.

### Claim 6 (depends on 5)

The flow sensor system of claim 5, wherein the electrical connection is made by wire bonding on a conductive pad that is adjacent to and connected to the sensing surface.

### Claim 7 (depends on 5)

The flow sensor system of claim 5, wherein the electrical connection is made by conductive material within a plurality of vias providing electrical connection from the sensing surface to an opposite surface of the sensing chip.