Flow monitoring devices and methods of use

• US 20050267413A1
• Filed: 05/26/2004
• Published: 12/01/2005
• Est. Priority Date: 05/26/2004
• Status: Abandoned Application

• Current Assignee: Baxter Healthcare SA (Baxter International Inc.), Baxter International Inc.
• Original Assignee: Baxter Healthcare SA (Baxter International Inc.), Baxter International Inc.
• Inventors: Desai, Siddharth, Wang, Jong H.
• Application Number:
  US10/853,916
• Publication Number:
  US 20050267413A1
• Time in Patent Office: Days
• US Class Current: 604/131
• CPC Class Codes: A61M 2005/14506 mechanically driven, e.g. spring or clockwork
• CPC Class Codes: A61M 2205/0244 Micromachined materials, e.g. made from silicon wafers, microelectromechanical systems [MEMS] or comprising nanotechnology
• CPC Class Codes: A61M 2205/18 with alarm
• CPC Class Codes: A61M 2205/3372 Temperature compensation
• CPC Class Codes: A61M 2205/3379 Masses, volumes, levels of fluids in reservoirs, flow rates
• CPC Class Codes: A61M 5/141 with capillaries for restricting fluid flow
• CPC Class Codes: A61M 5/145 using pressurised reservoirs, e.g. pressurised by means of pistons
• CPC Class Codes: 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
• CPC Class Codes: A61M 5/16854 by monitoring line pressure
• CPC Class Codes: A61M 5/16886 for measuring fluid flow rate, i.e. flowmeters
• CPC Class Codes: A61M 5/172 electrical or electronic A61M5/16804, A61M5/16831 take precedence

Abstract

The present invention discloses a number of devices and methods for monitoring a flow within a flow circuit. In one embodiment, a flow indicator is disclosed and includes a flow indicator device having a body, the body having first conduit port and a second conduit port formed thereon, the second conduit port in communication with an ambient environment, at least one indicator conduit in fluid communication with an infusion circuit and the first conduit port, a sensing device positioned within the body and in fluid communication with the first and second conduit ports, and at least one indicator positioned on the body and in communication with the sensing device.

Claims

1. A flow indicating infusion set for an ambulatory infusion pump, the set comprising:

an infusion circuit configured to be placed in fluid communication with the pump, the infusion circuit the circuit defining a passageway for fluid expelled from the pump, the circuit including a first flow restrictor and a second flow restrictor;

a flow indicator device having a body, the body having first conduit port and a second conduit port formed thereon;

at least one indicator conduit providing sensory communication between the first conduit port and a fluid pressure present at a location between the first flow restrictor and the second flow restrictor;

a sensing device positioned within the body and in fluid communication with the first and second conduit ports, to sense the pressure differential between the pressures present at the first and second conduit ports, the sensing device configured to output a signal in dependence on the sensed pressure; and

at least one indicator positioned on the body and in communication with the sensing device to receive the signal.

2. The device of claim 1 wherein the sensing device further comprises:

a sensor housing defining a sensor device cavity, the sensor device cavity in fluid communication with the first and second conduit ports; and

a sensor positioned with the sensor device cavity.

3. The device of claim 2 wherein the sensor comprises a piezoelectric sensor.

4. The device of claim 2 wherein the sensor comprises a low flow pressure sensor.

5. The device of claim 1 wherein the second conduit port is in sensory communication with the pressure of the atmosphere.

6. The device of claim 1 wherein the at least one indicator comprises a light emitting diode.

7. The device of claim 1 wherein the at least one indicator comprises an audible alarm.

8. The device of claim 1 wherein the pump is an elastomeric pump.

9. The device of claim 1 wherein the passageway is sterilized.

10. A flow measuring infusion set for an ambulatory infusion pump, the set comprising:

a flow circuit configured to be placed in fluid communication with the pump, the flow circuit defining a passageway for fluid expelled from the pump, the circuit including a flow restrictor disposed along the length thereof;

a flow meter body disposing at least one display device thereon, the flow meter body including an upstream flow port and a downstream flow port;

an upstream flow conduit providing sensory communication between the upstream flow port and a fluid pressure present at a location upstream of the flow restrictor;

a upstream flow port formed on the flow meter body and in sensory communication with the upstream flow conduit;

a downstream flow conduit providing sensory communication between the upstream flow port and a fluid pressure present at a location downstream of the flow restrictor;

a sensing device positioned within the flow meter body and in communication with the upstream flow port and the downstream flow port, the sensing device in communication with the display device.

11. The device of claim 10 further comprising a sensor housing having a sensor receiving cavity formed therein, the sensor receiving cavity in communication with the upstream flow port and the downstream flow port.

12. The device of claim 11 further comprising a pressure differential sensor positioned within the sensor housing.

13. The device of claim 10 wherein the display device is a liquid crystal display.

14. The device of claim 10 wherein the sensor comprises a piezoelectric sensor.

15. The device of claim 10 wherein the sensing device is configured to measure flow rates of about 0.1 ml/hr to about 2 ml/hr.

16. The device of claim 10 wherein the sensing device includes means for calculating the volume of fluid that has flowed through the restrictor

17. The device of claim 10 further comprising a temperature sensor in communication with the infusion circuit and the sensing device, the temperature sensor configured to measure the temperature of a fluid within the infusion circuit.

18. The device of claim 17 further comprising a timing device positioned therein and configured to measure the rate of a flow through the circuit as a function of time.

19. A device for measuring the flow rate of fluid expelled by a pump through an infusion circuit, the circuit including a flow restrictor, the device comprising:

a body disposing at least one display device and at least one indicator thereon;

an upstream flow conduit in communication with a flow circuit upstream of the flow restrictor;

a upstream flow port formed on the body and in fluid communication with the upstream flow conduit;

a downstream flow conduit in communication with a flow circuit downstream of the flow restrictor;

a downstream flow port formed on the body and in fluid communication with the downstream flow conduit;

a sensing device positioned within the flow indicator body and in fluid communication with the upstream flow port and the downstream flow port, the sensing device in communication with the display device and the indicator; and

an timing device in communication with the flow measuring device and configured to measure the total flow volume within a flow circuit by measuring the flow rate flowing through the infusion circuit as a function of time.