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A valve for use in microfluidic structures. The valve uses a spherical member, such as a ball bearing, to depress an elastomeric member to selectively open and close a microfluidic channel. The valve may be operated manually or by use of an internal force generated to shift the spherical member to i

A valve for use in microfluidic structures. The valve uses a spherical member, such as a ball bearing, to depress an elastomeric member to selectively open and close a microfluidic channel. The valve may be operated manually or by use of an internal force generated to shift the spherical member to its activated position.

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A valve for use in microfluidic structures. The valve uses a spherical member, such as a ball bearing, to depress an elastomeric member to selectively open and close a microfluidic channel. The valve may be operated manually or by use of an internal force generated to shift the spherical member to i

A valve for use in microfluidic structures. The valve uses a spherical member, such as a ball bearing, to depress an elastomeric member to selectively open and close a microfluidic channel. The valve may be operated manually or by use of an internal force generated to shift the spherical member to its activated position. . 3. The valve of claim 1, wherein said first flexible layer is constructed from polyvinylidene chloride. 4. The valve of claim 1, wherein said spherical actuator comprises a metal ball bearing. 5. The valve of claim 1, wherein said shifting means comprises mechanical operating means. 6. The valve of claim 1, further comprising: a second rigid layer, located adjacent said first flexible layer on the side opposite said first channel; a second flexible layer; a second channel, formed between said second rigid layer and said second flexible layer, for containing said spherical actuator; a third rigid layer; a first aperture, located in said second rigid layer, for positioning said spherical actuator within said second channel during actuation; a third channel, formed between said second flexible layer and said third rigid layer, for containing said shifting means. 7. The valve of claim 1, wherein said shifting means comprises a fluid flowing within said third channel. 8. The valve of claim 1, wherein said second flexible layer comprises an elastomeric material. 9. The valve of claim 1, wherein all of said rigid layers are constructed from MYLAR. 10. A microfluidic control system, comprising: a plurality of valves, with each valve comprising a first rigid layer; a first flexible layer; a first channel, formed between said first rigid layer and said first flexible layer, said first channel having an inlet and an outlet and capable of fluid flow from said inlet to said outlet; a spherical actuator located adjacent said first flexible layer on the side opposite said first rigid layer; means for shifting said actuator to an actuating position; a second rigid layer, located adjacent said first flexible layer on the side opposite said first channel; a second flexible layer; a second channel, formed between said second rigid layer and said second flexible layer, for containing said spherical actuator; a third rigid layer; a first aperture, located in said second rigid layer, for positioning said spherical actuator within said second channel during actuation; a third channel, formed between said second flexible layer and said third rigid layer, for containing said shifting means; such that when said actuator is shifted to said actuating position a portion of said first flexible layer in shifted toward said first rigid layer, restricting fluid flow within said first channel; and means for controlling the operation of said plurality of valves. 11. The system of claim 10, wherein said controlling means comprises a computer. 12. The system of claim 10, wherein said controlling means comprises a programmable controller. 13. The valve of claim 7, wherein said fluid comprises air. 14. The valve of claim 1, wherein said spherical actuator is constructed from hard plastic. 15. The system of claim 10, wherein all of said rigid layers are constructed from MYLAR. 16. The system of claim 10, wherein said spherical actuators comprises ball bearings.