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1. (WO1991006338) SELF-DRIVEN PUMP DEVICE
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I claim as my invention:

1. An apparatus for delivering fluid with a relatively constant, controlled rate of flow
comprising, in combination, a vacuum power means including a sealed portion comprising at least a partial vacuum, a fluid storage means mounted in axial alignment with said vacuum power means, and a plunger means carried by said vacuum power means, said plunger means forming a movable wall of said sealed portion in sealing and sliding engagement with said vacuum power means, and having a first side and a second side, said first side of said movable wall being exposed to the atmosphere, and said second side being exposed .-to the sealed portion of said vacuum power means, said plunger means being in axial-communication with said fluid storage means and being driven by the collapse of the vacuum in said sealed portion caused by the energy differential between atmospheric pressure on the first side of said movable wall and the vacuum in said sealed portion of said vacuum power means on the second side of said movable wall to drive fluid from the fluid storage means . «

2. The apparatus of claim 1 wherein said fluid storage means comprises a housing for receiving a flexible bag capable of carrying fluid to be
delivered from said apparatus and having collapsible walls, said flexible bag being carried in said housing.

3. The apparatus of claim 1 wherein said fluid storage means is detachably secured to said vacuum power means.

4. The apparatus of claim 1 wherein said fluid storage means is affixed to said vacuum power means.

5. The apparatus of claim 1 wherein said orifice in said fluid storage means includes a duck bill valve.

6. The apparatus of claim 5 wherein said apparatus includes a fluid administration set in communication with said orifice for further
controlling the rate of flow of fluid from said apparatus.

7. An apparatus for delivering fluid with a relatively constant, controlled rate of flow
comprising, in combination, a first chamber
comprising a vacuum power chamber for driving the fluid to be delivered from the apparatus, said first chamber comprising a sealed portion comprising at least a partial vacuum, a separate second chamber comprising a fluid storage chamber adapted to receive a fluid, said second chamber being mounted to said first chamber in axial alignment with said first chamber, and plunger means carried in said first chamber to effect delivery of fluid from the
apparatus, said plunger means forming a movable wall of said sealed portion in sealing and sliding
engagement with said first chamber, said first chamber having a first end open to the atmosphere, and a second end sealed to the atmosphere, said plunger means being disposed in said first chamber so that the movable wall of said plunger means forms one end of the sealed portion, and said plunger means having a portion thereof extending from the sealed end of said first chamber in axial communication with said second chamber, said second chamber having a first end for receiving the portion of said plunger means which extends from said first chamber and a second end forming an orifice through which fluid is delivered, the first chamber being evacuated when the movable wall of' said plunger means is substantially at the open end of the first chamber so that
atmospheric pressure acts upon said plunger means to drive it toward the sealed end of said first chamber, whereby when the orifice in said second chamber is opened, atmospheric pressure acting upon said plunger means drives the movable wall of the plunger toward the sealed end of the first chamber and drives the portion of the plunger received by the second chamber toward the orifice of the second chamber to thereby drive the fluid contained in said second chamber through the orifice to deliver the fluid from the apparatus.

8. The apparatus of claim 7 wherein said second chamber comprises a housing for receiving a flexible container capable of carrying fluid to be delivered from said apparatus, said flexible container having collapsible walls, and being carried in said housing.

9. The apparatus of claim 7 wherein said plunger means comprises a first head which forms said movable wall and a rod means connected to said first head and extending from the sealed end of said first chamber in axial communication with said second chamber, said first head being in sealing and sliding assembly with said. rod means and including engaging means for engaging said rod means when said first head is substantially near the open end of said first chamber, and handle means secured to said first head to permit said first head to be moved toward said open end of said first chamber to allow said engaging means to engage said rod means.

10. The apparatus of claim 7 wherein said second chamber is detachably secured to said first: * . chamber.

11. The apparatus of claim 7 wherein said second chamber is affixed to said first chamber.

12. The apparatus of claim 7 wherein said orifice in said second chamber includes a duck bill valve.-

13. The apparatus of claim 9 wherein said second chamber comprises a housing for receiving a flexible container capable of carrying fluid to be delivered by said apparatus, said flexible container having collapsible walls and being carried in said housing.

14. The apparatus of claim 7 wherein said second chamber includes at its open end a movable end wall in sealing and sliding engagement with said second chamber, said movable end wall being capable of receiving said plunger means.

15. The apparatus of claim 9 wherein said orifice in said second chamber includes a duck bill valve.

16. The apparatus of claim 15 wherein said apparatus includes a fluid administration set in communication with said orifice for further
controlling the rate of flow of fluid from said apparatus.

17. The apparatus of claim 12 wherein said apparatus includes a fluid administration set in communication with said orifice for further
controlling the rate of flow of fluid from said apparatus.

18. The apparatus of claim 13 wherein said apparatus includes a fluid administration set in communication with said orifice for further .
controlling the rate of flow of fluid from said apparatus.

19. The apparatus of claim 14 wherein said orifice in said second chamber includes a duck bill valve.

20. The apparatus of claim 19 wherein said apparatus includes a fluid administration set in communication with said orifice for further
controlling the rate of flow of fluid from said apparatus.

21. An apparatus for delivering fluid with a relatively constant, controlled rate of flow
comprising, in combination,
a first vacuum power chamber for driving the fluid to be delivered from the apparatus, said first chamber comprising a sealed portion comprising at least a partial vacuum, a separate second chamber adapted to receive a fluid mounted to said first chamber in axial alignment therewith, and plunger means comprising a first head, a second head and a rod for connecting said first and second heads, said first chamber having a first end open to the
atmosphere, and having a second end which forms an opening for sealingly and slidingly receiving said rod of said plunger means, said second chamber having a first end capable of receiving said second head of said plunger means in sealing and sliding engagement' with said second chamber, and said second chamber having a second end which forms an orifice for the delivery of fluid,
said first head of said plunger means being disposed in s-aid first chamber so that said first head forms a movable wall for said sealed portion, said first head sealingly and slidingly engaging said first chamber and said rod extending through said opening in said second end of said first chamber in sealing and sliding engagement with said opening, said rod terminating in a second head for sealing and sliding engagement with said second end of said second chamber, said first chamber being evacuated when said first head is substantially at the open end of the first chamber so that atmospheric pressure acts upon said first head to drive it towards the first end of said first chamber,
whereby when said orifice is opened, atmospheric pressure acting upon said first head of said plunger means drives said first head toward the first end of said first chamber and drives said second head of said plunger means toward the orifice of the second chamber to thereby drive the fluid contained in said second chamber through the orifice to deliver the fluid.

22. The apparatus of claim 21 wherein said second chamber is detachably secured to said first chamber.

23. The apparatus of claim 21 wherein said second chamber is affixed to said first chamber.

24. The apparatus of claim 21 wherein said first head is in sealing and sliding assembly with said rod means and includes engaging means for engaging said rod means when said first head is substantially at the open end of said first chamber, and handle means secured to said first head to permit the first head to be moved toward said open end of said vacuum power chamber to allow said engaging means to engage said rod means.

25. The apparatus of claim 21 wherein said orifice in said second chamber includes a duck bill valve.

26. The apparatus of claim 21 wherein said apparatus includes a fluid administration set in communication with said orifice for further
controlling the rate of flow of fluid from said apparatus.

27. An apparatus for delivering fluid with a relatively constant, controlled rate of flow
comprising, in combination,
a vacuum power means for driving the fluid to be delivered from the apparatus, said vacuum power means comprising a sealed portion comprising at least a partial vacuum, a receptacle means carried by said vacuum power means for receiving and carrying a fluid storage means in axial alignment with said vacuum power means, fluid storage means adapted to receive fluid and adapted to be received in and carried by said receptacle in axial alignment with said vacuum power means, and plunger means carried in said vacuum power means to effect delivery of fluid from the apparatus, said plunger means forming a movable wall of said sealed portion in sealing and sliding
engagement with said vacuum power means and rod means extending from said movable wall, said vacuum power means having a first end open to the atmosphere, and having a second end which forms an opening for sealingly and slidably receiving said rod means, said plunger means being disposed in said vacuum power means so that the movable wall of said plunger means forms one end of said sealed portion of said vacuum power means, said rod means of said plunger means extending axially from said vacuum power means in axial alignment with said receptacle,
said plunger means having a handle means and locking means for drawing said plunger means toward the open end of said vacuum power means and locking said plunger means substantially at the open end of said vacuum power means, the vacuum power means being evacuated when said movable wall of said plunger means is substantially at the open end of said vacuum power means so that atmospheric pressure acts upon said plunger means to drive it toward the sealed end of said vacuum power means,
said fluid storage means having a first end capable of receiving said plunger means and having a second end which forms an orifice for the delivery of fluid,
said plunger means being in axial communication with said fluid storage means so that when said 32
plunger locking means is unlocked and the orifice in said fluid storage means is opened, atmospheric pressure acting upon said movable wall of said
plunger means drives said movable wall toward the sealed end of said vacuum power means and drives said rod means toward the orifice of said fluid storage means to thereby dζive the fluid contained in said fluid storage means through the orifice to deliver the fluid from the apparatus.

28. The apparatus of claim 27 wherein said fluid storage means comprises a flexible container capable of carrying fluid to be delivered from said apparatus, said flexible container having collapsible, walls and being carried in said receptacle.

29. The apparatus of claim 27 wherein said fluid storage means includes a movable wall at said first end thereof, said movable wall being capable of receiving said rod means of the plunger means so that as the movable wall of said plunger means is driven toward the sealed end of the vacuum power means said rod means engages said movable wall of said fluid storage means and said movable wall of said fluid storage means is driven toward the orifice of said fluid storage means to thereby drive fluid contained in said fluid storage means through the orifice to deliver fluid from the apparatus.

30. The apparatus of claim 29 wherein said movable wall of said fluid storage means is in
sealing and sliding engagement with said fluid
storage means and forms a movable cover of said fluid storage means.

31. The apparatus of claim 27 wherein said orifice in said fluid storage means includes a duck bill valve.

32. The apparatus of' claim 31 wherein said apparatus includes a fluid administration set in communication with said orifice for further
controlling the rate of flow of fluid from said apparatus.

33. The apparatus of claim 30 wherein said orifice in said fluid storage means includes a duck bill valve.

34. The apparatus of claim 33 wherein said apparatus includes a fluid administration set in communication with said orifice for further controlling the rate of flow of fluid from said apparatus.