System for sealing a pump cassette against a cassette control assembly

• US 9,957,960 B2
• Filed: 08/31/2015
• Issued: 05/01/2018
• Est. Priority Date: 10/30/2003
• Status: Active Grant

• Current Assignee: Deka Products Limited Partnership
• Original Assignee: Deka Products Limited Partnership
• Inventors: Lanigan, Richard J., Dale, James D.
• Primary Examiner(s): Letterman, Bryan
• Assistant Examiner(s): SOLAK, TIMOTHY P
• Application Number:
  US14/840,591
• Publication Number:
  US 20160245277A1
• Time in Patent Office: 974 Days
• CPC Class Codes: A61L 2/0088 Liquid substances
• CPC Class Codes: A61L 2/24 Apparatus using programmed or automatic operation
• CPC Class Codes: A61M 1/0213 with isolated sections of the tube used as additive reservoirs
• CPC Class Codes: A61M 1/0272 Apparatus for treatment of blood or blood constituents prior to or for conservation, e.g. freezing, drying or centrifuging
• CPC Class Codes: A61M 1/0281 Apparatus for treatment of blood or blood constituents prior to transfusion, e.g. washing, filtering or thawing
• CPC Class Codes: A61M 1/36225 with blood pumping means or components thereof
• CPC Class Codes: A61M 1/3687 Chemical treatment A61M1/3675 takes precedence
• CPC Class Codes: A61M 2205/125 with incorporated filters
• CPC Class Codes: B01F 23/451 by injecting one liquid into another
• CPC Class Codes: B01F 23/49 Mixing systems, i.e. flow charts or diagrams
• CPC Class Codes: B01F 25/105 Mixing heads, i.e. compact mixing units or modules, using mixing valves for feeding and mixing at least two components
• CPC Class Codes: B01F 25/60 Pump mixers, i.e. mixing within a pump
• CPC Class Codes: B01F 33/81 Combinations of similar mixers, e.g. with rotary stirring devices in two or more receptacles
• CPC Class Codes: B01F 33/811 in two or more consecutive, i.e. successive, mixing receptacles or being consecutively arranged
• CPC Class Codes: B01F 35/711 for feeding a mixture of components, i.e. solids in liquid, solids in a gas stream
• CPC Class Codes: B01F 35/715 Feeding the components in several steps, e.g. successive steps
• CPC Class Codes: B01F 35/8823 using diaphragms or bellows
• CPC Class Codes: F04B 13/02 of two or more fluids at the same time
• CPC Class Codes: F04B 23/02 having reservoirs
• CPC Class Codes: F04B 23/06 the pumps being all of reciprocating positive-displacement type
• CPC Class Codes: F04B 43/0009 : Special features
• CPC Class Codes: F04B 43/06 : Pumps having fluid drive
• CPC Class Codes: F04B 49/22 : by means of valves F04B49/03 takes precedence
• CPC Class Codes: F04B 53/06 : Venting
• CPC Class Codes: F04B 53/16 : Casings; Cylinders; Cylinder liners or heads; Fluid connections
• CPC Class Codes: F04B 53/22 : Arrangements for enabling ready assembly or disassembly
• CPC Class Codes: G05D 11/132 : by controlling the flow of the individual components G05D11/133 takes precedence
• CPC Class Codes: Y02A 50/30 : Against vector-borne diseases, e.g. mosquito-borne, fly-borne, tick-borne or waterborne diseases whose impact is exacerbated by climate change
• CPC Class Codes: Y10T 137/0329 : Mixing of plural fluids of diverse characteristics or conditions
• CPC Class Codes: Y10T 137/0352 : Controlled by pressure
• CPC Class Codes: Y10T 137/86131 : Plural
• CPC Class Codes: Y10T 137/87652 : With means to promote mixing or combining of plural fluids
• CPC Class Codes: Y10T 29/53 : Means to assemble or disassemble
• CPC Class Codes: Y10T 292/0911 : Hooked end
• CPC Class Codes: Y10T 292/212 : With expanding or contracting means
• CPC Class Codes: Y10T 292/438 : Spring-arm catch

Abstract

A system and method for pumping fluid using a pump cassette is disclosed. The system includes a control assembly for operating the pump cassette. A force assembly having a movable member is capable of applying force to the pump cassette to press the pump cassette against the control assembly. The movable member may be an expandable member, such as a bladder.

Claims

1. A system for pumping fluid comprising:

a pump cassette that includes a pumping chamber, an inlet, an outlet, one or more fluid channels, and a flexible membrane that can be displaced to pump fluid within the pump cassette;

a chassis on which a control assembly is attached, the control assembly having pneumatic channels for actuating the flexible membrane on the pump cassette;

a door hingedly mounted to the chassis, the door including a force assembly having a movable member for pressing the pump cassette against the control assembly; and

a cassette receptacle interposed between the door and the chassis configured to support the pump cassette and to move the pump cassette toward the control assembly as the door is closed or away from the control assembly as the door is opened;

wherein

actuation of the force assembly sealingly presses the pump cassette against the control assembly upon closing the door and actuating the force assembly.

2. The system of claim 1, wherein the force assembly is configured to apply a continuous force against the pump cassette.

3. The system of claim 1, wherein the movable member is expandable, the expansion of which provides a force to press the pump cassette against the control assembly.

4. The system of claim 3, wherein the movable member is pneumatically expandable.

5. The system of claim 1, wherein the movable member comprises or is moved by an expandable bladder within the door.

6. The system of claim 5, wherein the expandable bladder is pneumatically expandable.