MICROFLUIDIC DEVICES AND RELATED METHODS AND SYSTEMS

• US 20080145286A1
• Filed: 10/18/2007
• Published: 06/19/2008
• Est. Priority Date: 10/18/2006
• Status: Active Grant

• Current Assignee: California Institute of Technology
• Original Assignee: California Institute of Technology
• Inventors: Scherer, Axel, Maltezos, George
• Granted Patent: US 7,790,118 B2
• Time in Patent Office: Days
• US Class Current: 422/224
• CPC Class Codes: B01L 2200/0689 Sealing
• CPC Class Codes: B01L 2200/16 Reagents, handling or storing thereof
• CPC Class Codes: B01L 2300/044 pierceable, e.g. films, membranes
• CPC Class Codes: B01L 2300/0816 Cards, e.g. flat sample carriers usually with flow in two horizontal directions
• CPC Class Codes: B01L 2300/0867 Multiple inlets and one sample wells, e.g. mixing, dilution
• CPC Class Codes: B01L 2400/0487 fluid pressure, pneumatics
• CPC Class Codes: B01L 2400/0633 with moving parts
• CPC Class Codes: B01L 2400/0655 pinch valves
• CPC Class Codes: B01L 3/502707 characterised by the manufacture of the container or its components by shaping or joining plastic parts B29C59/00, B29C65/00; by laminating B32B37/00; manufacture of microstructural devices in general B81C
• CPC Class Codes: B01L 3/502738 characterised by integrated valves microvalves F16K99/0001
• CPC Class Codes: B01L 3/52 Containers specially adapted for storing or dispensing a reagent B01L3/02 takes precedence; containers for medical or pharmaceutical purposes A61J1/00; containers in general B65D; storing or dispensing test elements G01N33/4875; automated reagent dispensing G01N35/1002
• CPC Class Codes: Y10T 137/2224 Structure of body of device
• CPC Class Codes: Y10T 137/87716 For valve having a flexible diaphragm valving member

Abstract

In a fluidic device with a storage compartment communication is allowed between the storage compartment and other portions of the device. The communication is controlled through a valve arrangement and a membrane covering the compartment. The valve arrangement can be provided through a sealing clamp with clamp fingers. The clamp fingers control communication between the storage compartment and remaining portions of the fluidic device.

Claims

1. A microfluidic device comprising

a storage compartment, the storage compartment adapted to comprise a reagent suitable for a reaction to occur in the microfluidic device,

a reaction area, where a reaction involving said reagent is adapted to occur;

a microfluidic channel connecting the storage compartment with the reaction area;

a valve arrangement, to control opening and closing of the microfluidic channel; and

a membrane adapted to cover at least portion of the storage compartment, reaction area, and microfluidic channel, the membrane being adapted to seal the at least portion of storage compartment, reaction area, and microfluidic channels, upon filling of the storage compartment with the reagent.

2. The microfluidic device of claim 1, wherein the storage compartment includes a first storage compartment and a second storage compartment and the microfluidic channel connects the first storage compartment with the second storage compartment

3. The microfluidic device of claim 1, wherein storage state of the reagent is compatible with a desired temperature of storage.

4. The microfluidic device of claim 3, wherein said temperature of storage is from 4°

C. to room temperature.

5. The microfluidic device of claim 1, wherein the reagents are in a first physical state during a rest state of the microfluidic device and are brought to a second physical state during an operative state of the microfluidic device.

6. The microfluidic device of claim 1, wherein the valve arrangement comprises a solenoid actuator and a membrane, and wherein movement of the solenoid actuator is adapted to deform the membrane thus preventing flow in the microfluidic channels.

7. The microfluidic device of claim 1, further comprising a waste area connected to a vent, wherein, during operation of the microfluidic device, vacuum is adapted to be applied to the vent to control flow in the microfluidic channels in combination with the valve arrangement.

8. The microfluidic device of claim 1, further comprising a microfluidic mixer located along the microfluidic channel.

9. A hermetically sealed bag comprising the microfluidic device of claim 1.

10. A machine reader comprising the microfluidic device of claim 1.

11. The machine reader of claim 10, the machine reader further comprising clamp valves actuated by said machine reader.

12. The microfluidic device of claim 1, further comprising a top cover, the top cover allowing initial storage of liquid and dry substances in the liquid storage compartments and the dry storage compartments.

13. The microfluidic device of claim 1, comprising a top section and a bottom section, the top section being a polymer molded in a layer and the bottom section being a plastic card containing the storage compartments, the reaction area and the microfluidic channels.

14. The microfluidic device of claim 1, the microfluidic device further comprising a clamp to allow connection of the microfluidic device to a substrate.

15. The microfluidic device of claim 14, wherein the clamp is a metal or plastic clamp.

16. The microfluidic device of claim 1, further comprising a cover element including valve clamps, the valve clamps acting as the valve arrangement.

17. The microfluidic device of claim 16, wherein the valve clamps are electromechanically actuated.

18. The microfluidic device of claim 16, wherein the valve clamps are bendable valve clamps.

19. The microfluidic device of claim 1, further comprising a sealing clamp, the sealing clamp adapted to seal the membrane at least over the storage chambers.

20. The microfluidic device of claim 19, wherein the sealing clamp comprises at least one clamp finger, the at least one clamp finger being part of a valve arrangement and adapted to provide a valve control communication between the first storage compartment and the second storage compartment.

21. The microfluidic device of claim 19, wherein the at least one clamp finger and the sealing clamp are independently operable.

22. The microfluidic device of claim 19, further comprising at least one clamp lever to actuate the at least one clamp finger.

23. The microfluidic device of claim 19, wherein the at least one clamp fingers are a plurality of independently operable clamp fingers.

24. The microfluidic device of claim 19, wherein the clamp fingers are adapted to seal other portion of the microfluidic device to prevent the fluid from coming out of the microfluidic device after use.

25. The microfluidic device of claim 1, further including a filter trapped in a microfluidic channel.