|
PatentVote.com: Vote on your favourite invention!
|
|
 |
Title: Drug dispenser for use with intravenous feeding pump
Claims: What is claimed is: 1. A drug dispensing device for a patient adapted for use in conjunction with an intravenous feeding pump providing a source of parenteral fluid supplied aat a controlled rate comprising: a. a cylinder; b. means enclosing both ends of said cylinder; c. a liquid separator slidably fitting inside said cylinder and forming first and second chambers in said cylinder on opposite sides of said liquid separator; d. a fluid inlet into one end of said cylinder in continuous communication with said first chamber and adapted to be connected to said source of parenteral fluid; e. an outlet from the other end of said cylinder; and in continuous communication with said second chamber and adapted to be connected to the patient, f. a drug in a liquid carrier disposed in said second chamber; g. means adjacent said outlet end of said cylinder for bypassing said liquid separator whereby upon introduction of parenteral fluid into said first chamber said liquid separator will be moved to cause said drug in a liquid carrier to be forced into the patient and thereafter parenteral fluid into the patient without breaking the connections between the source of parenteral fluid and the patient. 2. The device of claim 1 together with hydrophobic means carried by the liquid separator for permitting air to pass between said first and second chambers. 3. The device of claim 2 together with hydrophobic means carried by the cylinder for permitting air to escape from the cylinder. 4. The device of claim 1 wherein means for bypassing said liquid separator includes at least one channel formed in the inner surface of said cylinder and having a length which is greater than the thickness of the liquid separator. 5. The device of claim 1 wherein the means for bypassing said liquid separator includes at least one ridge carried by the inner surface of said cylinder adapted to deform said liquid separator and thereby provide a leakage path around said liquid separator. 6. The apparatus of claim 1 together with guide vanes carried by the liquid separator to prevent tilting of the liquid separator within the cylinder. 7. Apparatus for administering drugs and parenteral fluids to a patient, a source supplying parenteral fluid at a controlled rate, a container having inlet and outlet ends, means connecting the inlet end to the source of parenteral fluid, a piston-like member slidably disposed in said container forming first and second chambers in said container on opposite sides of said piston-like member with the first chamber being in continuous communication with the inlet end and the second chamber being in continuous communication with the outlet end, said piston-like member forming a liquid tight seal between said first and second chambers, parenteral fluid from said source filling said first chamber, a drug in a liquid carrier filling said second chamber, means for connecting the outlet end to the patient, means carried by the container adjacent to the outlet end of the container for bypassing the piston-like member whereby upon introduction of additional parenteral fluid into the first chamber, the piston-like member is caused to move to force the drug in the liquid carrier into the patient and thereafter parenteral fluid into the patient without breaking the connections between the source of parenteral fluid and the patient. 8. Apparatus as in claim 7, together with hydrophobic means carried by the piston-like member to permit air to pass through said piston-like member from one of said chambers to the other of said chambers. 9. Apparatus as in claim 8, together with means for permitting escape of air from said container. 10. In a method for administering drugs and parenteral fluids to a patient by the use of a container having inlet and outlet ends with the outlet end being adapted to be connected to the patient and the inlet end adapted to be connected to a source of parenteral fluid and with a piston-like member slidably mounted within the container and serving to form first and second liquid-tight chambers in the container on opposite sides of the piston-like member with the first of the chambers being in continuous communication with the inlet end and the second of the chambers in continuous communication with the outlet end, the steps of placing a drug to be administered to a patient in a liquid carrier in the second chamber, introducing parenteral fluid into the first chamber to move the piston-like member in the container to force the drug from the second chamber into the patient and thereafter introducing parenteral fluid into the patient by causing the parenteral fluid to bypass the piston-like member after the drug has been supplied to the patient without disturbing the connections to the patient and to the source of parenteral fluid. Other info: Inventors: Lundquist, Ingemar H. (Oakland, CA, US) Application Number: 538372 Filing Date: 1975-01-03 Publication_date: 1976-08-24 Assignee: Origo, Inc. (Hayward, CA) Primary Class(es): 604/518 604/83, 604/246 Other Classes: US Patent Ref:
Other Refs:
Primary Examiner: Truluck, Dalton L. Assistant Examiner: Attorney: Flehr, Hohbach, Test, Albritton & Herbert |
|