Electrokinetic pump designs and drug delivery systems
First Claim
1. A piston assembly, comprising:
- a piston housing;
a material housing within the piston housing that divides the piston housing into a first portion and a second portion, the material housing having apertures that provide fluid communication between the first portion and the second portion;
a porous material inside of the material housing;
a first shaft connecting the material housing to a piston head outside of the piston housing;
a second shaft connecting the material housing to a handle outside of the piston housing; and
a valve within the second shaft, wherein actuation of the valve provides a flow path between the first portion and the second portion, and wherein the flow path includes a bypass through the porous material contained in the material housing.
4 Assignments
0 Petitions
Accused Products
Abstract
One embodiment of the present invention provides a piston assembly having a piston housing filled with an electrolyte; a housing within the piston housing that divides the piston housing into a first portion and a second portion, the housing having apertures, a shaft connecting the housing to a piston head outside of the piston housing; and a porous material inside of the housing in contact with the electrolyte. Additionally, there are provided a method for filling the delivery chamber with a delivery fluid by withdrawing the piston head from within the delivery chamber. Yet another embodiment provides a method for filling a fluid delivery assembly by withdrawing a shaft from within the fluid delivery assembly to simultaneously displace a moving pump element within the delivery chamber and bypass fluid around a housing in the pump chamber.
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Citations
16 Claims
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1. A piston assembly, comprising:
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a piston housing; a material housing within the piston housing that divides the piston housing into a first portion and a second portion, the material housing having apertures that provide fluid communication between the first portion and the second portion; a porous material inside of the material housing; a first shaft connecting the material housing to a piston head outside of the piston housing; a second shaft connecting the material housing to a handle outside of the piston housing; and a valve within the second shaft, wherein actuation of the valve provides a flow path between the first portion and the second portion, and wherein the flow path includes a bypass through the porous material contained in the material housing. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A pump, comprising:
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a delivery chamber, a pump chamber and a wall separating the pump chamber from the delivery chamber; and a piston assembly having; a piston head in the delivery chamber; a material housing in the pump chamber, wherein the material housing divides the pump chamber into a first portion and a second portion; a shaft connecting the piston head to the material housing and passing through the wall separating the pump chamber from the delivery chamber; a bypass valve in the shaft that provides a fluid pathway between the first portion of the pump chamber and the second portion of the pump chamber; and a dielectric material in the material housing. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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Specification