Methods and systems for pulsed delivery of fluids from a pump

• US 20050100450A1
• Filed: 06/14/2004
• Published: 05/12/2005
• Est. Priority Date: 07/20/1999
• Status: Abandoned Application

• Current Assignee: Deka Products Limited Partnership
• Original Assignee: Deka Products Limited Partnership
• Inventors: Spencer, Geoff P., Gray, Larry B., Bryant, Robert J.
• Application Number:
  US10/868,674
• Publication Number:
  US 20050100450A1
• Time in Patent Office: Days
• US Class Current: 417/297
• CPC Class Codes: A61M 1/36225 with blood pumping means or components thereof
• CPC Class Codes: A61M 1/362261 at least one cassette surface or portion thereof being flexible, e.g. the cassette having a rigid base portion with preformed channels and being covered with a foil
• CPC Class Codes: A61M 1/362264 the filter being a blood filter
• CPC Class Codes: A61M 1/362265 Details of valves
• CPC Class Codes: A61M 1/362266 Means for adding solutions or substances to the blood
• CPC Class Codes: A61M 1/367 Circuit parts not covered by the preceding subgroups of group A61M1/3621
• CPC Class Codes: A61M 1/3696 with means for adding or withdrawing liquid substances during the centrifugation, e.g. continuous centrifugation
• CPC Class Codes: A61M 2205/053 ultraviolet
• CPC Class Codes: A61M 2205/12 with interchangeable cassettes forming partially or totally the fluid circuit
• CPC Class Codes: A61M 2205/123 with incorporated reservoirs
• CPC Class Codes: A61M 2205/125 with incorporated filters
• CPC Class Codes: A61M 2205/128 with incorporated valves
• CPC Class Codes: A61M 2205/14 Detection of the presence or absence of a tube, a connector or a container in an apparatus
• CPC Class Codes: A61M 2205/17 with redundant control systems
• CPC Class Codes: A61M 2205/3334 Measuring or controlling the flow rate
• CPC Class Codes: A61M 2205/3396 Reservoirs being alternately filled and emptied for measuring flow rate or delivered volume
• CPC Class Codes: A61M 2205/50 with microprocessors or computers
• CPC Class Codes: A61M 39/22 Valves or arrangement of valves A61M39/02, A61M39/0247, A61M39/16 take precedence; regulating valves in infusion systems A61M5/16881; in devices worn by the patient for the reception of urine, faeces, catamenial or other discharge, or in colostomy devices A61F5/4405
• CPC Class Codes: A61M 39/281 Automatic tube cut-off devices, e.g. squeezing tube on detection of air
• CPC Class Codes: A61M 5/14224 Diaphragm type
• CPC Class Codes: A61M 5/14593 : the diaphragm being actuated by fluid pressure
• CPC Class Codes: A61M 5/16809 : by repeated filling and emptying of an intermediate volume pressure infusion using positive displacement pumps A61M5/142
• CPC Class Codes: A61M 5/16813 : by controlling the degree of opening of the flow line
• CPC Class Codes: A61M 5/16859 : Evaluation of pressure response, e.g. to an applied pulse
• CPC Class Codes: A61M 5/365 : Air detectors A61M5/1684 takes precedence; in extracorporeal blood circuits A61M1/3626
• CPC Class Codes: A61M 60/109 : incorporated within extracorporeal blood circuits or systems
• CPC Class Codes: A61M 60/113 : in other functional devices, e.g. dialysers or heart-lung machines
• CPC Class Codes: A61M 60/43 : using vacuum at the blood pump, e.g. to accelerate filling
• CPC Class Codes: A61M 60/546 : of blood flow, e.g. by adapting rotor speed
• CPC Class Codes: A61M 60/847 : arranged in a cassette
• CPC Class Codes: A61M 60/851 : Valves
• CPC Class Codes: A61M 60/892 : Active valves, i.e. actuated by an external force
• CPC Class Codes: A61M 60/894 : Passive valves, i.e. valves actuated by the blood
• CPC Class Codes: F04B 13/00 : Pumps specially modified to deliver fixed or variable measured quantities
• CPC Class Codes: F04B 43/0081 : systems, control, safety measures
• CPC Class Codes: F04B 43/067 : the fluid being actuated directly by a piston
• CPC Class Codes: F04B 43/073 : the actuating fluid being controlled by at least one valve
• CPC Class Codes: F04B 43/107 : the fluid being actuated directly by a piston
• CPC Class Codes: F04B 43/113 : the actuating fluid being controlled by at least one valve
• CPC Class Codes: F04B 49/065 : and making use of computers
• CPC Class Codes: F04B 49/24 : Bypassing
• CPC Class Codes: F04B 53/06 : Venting

Abstract

Methods and systems are disclosed for pumping fluids at desired average flow rates by applying a predetermined force to a pump chamber and pulsing an outlet valve of the pump chamber to deliver a fluid therefrom. In some embodiments, pump chambers are provided within removable pumping cartridges that are constructed and configured to be coupled to a reusable pump drive component. In other embodiments, the pumping cartridges include multiple pump chambers, which pump chambers are operated so that a pump flow rate of one pump chamber is a predetermined fraction of the pump flow rate of another pump chamber within the pumping cartridge.

Claims

1-36. -36. (canceled)

37. A fluid metering system comprising:

a reusable component constructed and arranged for operative association with a removable pumping cartridge, said pumping cartridge including at least one pump chamber having an inlet line having a first valve therein and an outlet line having a second valve therein, said pump chamber being at least partially formed from a movable surface;

valve actuating means for operating the first valve and the second valve;

pump chamber actuating means for applying a force to said movable surface;

control means for controlling said valve actuating means and said pump chamber actuating means to deliver a fluid at a desired flow rate from the pump chamber by closing said first valve, applying a force to the movable surface, and pulsing said second valve.