Apparatus for infusing medical solutions
First Claim
Patent Images
1. An infusion apparatus for infusing at least two or more different medical fluids comprising:
- a first reservoir, a second reservoir, a third reservoir and a forth reservoir wherein each said reservoir has an interior for containing one of said medical fluids;
means for pressurizing said first reservoir to a first pressure, said second reservoir to a second pressure, said third reservoir to a third pressure and said forth reservoir to a forth pressure such that the first pressure is greater than the second pressure, said second pressure being greater than the third pressure, said third pressure being greater than the forth pressure;
said means for pressurizing comprising an elastomeric membrane;
means for connecting said interior of each said reservoir to a single IV conduit; and
means for connecting said IV conduit to a patient.
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Abstract
An IV infusion method and apparatus includes a plurality of fluid pumps mounted within a portable support housing and coupled to an IV tube. Each separate fluid pump is adapted to deliver fluid at a substantially constant delivery pressure predetermined by the characteristics of the pump. Each fluid pump includes an elastomeric membrane stretched into its region of nonlinear elasticity over a contour surface. Check valves located between the pumps and the IV tube control sequential dispensing of fluids from the pumps. The method and apparatus are especially adapted to a SASH process.
97 Citations
13 Claims
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1. An infusion apparatus for infusing at least two or more different medical fluids comprising:
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a first reservoir, a second reservoir, a third reservoir and a forth reservoir wherein each said reservoir has an interior for containing one of said medical fluids; means for pressurizing said first reservoir to a first pressure, said second reservoir to a second pressure, said third reservoir to a third pressure and said forth reservoir to a forth pressure such that the first pressure is greater than the second pressure, said second pressure being greater than the third pressure, said third pressure being greater than the forth pressure; said means for pressurizing comprising an elastomeric membrane; means for connecting said interior of each said reservoir to a single IV conduit; and means for connecting said IV conduit to a patient. - View Dependent Claims (2, 3, 4)
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5. A method for infusing medical solutions in a SASH process comprising:
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pressurizing with an elastomeric membrane a first reservoir for a fluid saline solution to a pressure band of P1, a second reservoir for a fluid antibiotic solution to a pressure band of P2, a third reservoir for a fluid saline solution to a pressure band of P3, and a fourth reservoir for a fluid heparin solution to a pressure band of P4, with P1 >
P2 >
P3 >
P4 wherein said pressurizing the first, second, third, and fourth reservoirs is with a elastomeric membrane by nonlinear contraction of the membrane while the membrane remains in a region of nonlinear elasticity, and further wherein said pressures P1, P2, P3 and P4 are controlled by a predetermined thickness of the elastomeric membrane;connecting each reservoir in flow communication to an IV line for a patient; discharging fluid sequentially from the first reservoir, then the second reservoir, then the third reservoir, and then the fourth reservoir with each reservoir substantially discharged of fluid prior to a next reservoir discharging fluid wherein the discharge from each reservoir but the forth reservoir is at a substantially constant pressure and said discharge is sequential by sensing a pressure differential between reservoirs for sequentially valving the reservoirs. - View Dependent Claims (6, 7, 8)
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9. An infusion apparatus for infusing medical fluids comprising:
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a first, a second, a third, and a fourth pumping means for pumping fluids at substantially constant pressure bands of P1, P2, P3 and P4 respectively from a first, a second, a third and a fourth chambers with P1 >
P2 >
P3 >
P4 wherein said chambers are formed on a single housing, a single membrane of a varying thickness covers the reservoirs and each said pumping means comprises means for stretching the membrane into its region of nonlinear elasticity, means for mounting the membrane on said stretching means to create a potential fluid chamber therebetween, and means for expelling fluid from the potential chamber by nonlinear contraction of the membrane while the membrane remains in the region of nonlinear elasticity;means for mounting and coupling said pumping means to an IV conduit; and valving means for sequentially completely discharging fluid from the first then the second then the third, and then the fourth chambers. - View Dependent Claims (10, 11, 12, 13)
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Specification