Hydrogel compositions, devices, and microscale components
First Claim
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1. An implantable, hydrogel-actuated microvalve comprising:
- (a) a first substrate permeable to a predetermined chemical compound;
(b) a volume-responsive hydrogel adjacent to the first substrate permeable to the predetermined chemical compound, the volume-responsive hydrogel undergoing a volume change in response to the predetermined chemical compound;
(c) a second substrate adjacent to the volume-responsive hydrogel, the second substrate deformable in response to the volume-responsive hydrogel; and
(d) a third substrate adjacent to the second substrate, the third substrate comprising an orifice capable of being sealed by the second substrate upon the deformation of the second substrate in response to a change in volume of the hydrogel.
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Abstract
The invention provides hydrogel compositions, components, and hydrogel-actuated or mediated devices, and methods for the incorporation of hydrogel microscale components in microscale devices and systems. The methods and devices result in active microvalves that are useful in microfluidic applications, including analyte sensing, in process chemical and fermentation stream monitoring, and drug delivery. In particular, the devices are useful for controlled drug delivery either in response to a pre-determined stimulus or for pulsatile delivery.
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Citations
13 Claims
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1. An implantable, hydrogel-actuated microvalve comprising:
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(a) a first substrate permeable to a predetermined chemical compound; (b) a volume-responsive hydrogel adjacent to the first substrate permeable to the predetermined chemical compound, the volume-responsive hydrogel undergoing a volume change in response to the predetermined chemical compound; (c) a second substrate adjacent to the volume-responsive hydrogel, the second substrate deformable in response to the volume-responsive hydrogel; and (d) a third substrate adjacent to the second substrate, the third substrate comprising an orifice capable of being sealed by the second substrate upon the deformation of the second substrate in response to a change in volume of the hydrogel. - View Dependent Claims (4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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2. An implantable, hydrogel-actuated microvalve comprising:
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(a) a first substrate permeable to a predetermined chemical compound; (b) a volume-responsive hydrogel adjacent to the first substrate permeable to the predetermined chemical compound, the volume-responsive hydrogel undergoing a volume change in response to the predetermined chemical compound; (c) a second substrate adjacent to the volume-responsive hydrogel, the second substrate deformable in response to the volume-responsive hydrogel; (d) a third substrate adjacent to the second substrate, the third substrate comprising a member, the member moveable in response to deformation of the second substrate in response to a change in volume of the hydrogel; (e) a fourth substrate adjacent to the third substrate, the fourth substrate comprising an orifice capable of being sealed by the member of the third substrate upon movement of the member.
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3. An implantable, hydrogel-actuated microvalve comprising:
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(a) a first substrate permeable to a predetermined chemical compound; (b) a volume-responsive hydrogel adjacent to the first substrate permeable to the predetermined chemical compound, the volume-responsive hydrogel capable of undergoing a volume change in response to the predetermined chemical compound; (c) a second substrate adjacent to the volume-responsive hydrogel, the second substrate deformable in response to the volume-responsive hydrogel; (d) a third substrate adjacent to the second substrate, the third substrate comprising a member, the member moveable in response to deformation of the second substrate; and (e) a fourth substrate adjacent to the third substrate, the fourth substrate comprising a flexible body, the flexible body controlling access, upon cooperative movement of the member with the volume-responsive hydrogel, to a channel disposed between the third substrate and the fourth substrate.
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Specification