Heat exchange fluid purification for dialysis system

• US 9,328,969 B2
• Filed: 10/04/2012
• Issued: 05/03/2016
• Est. Priority Date: 10/07/2011
• Status: Active Grant

• Current Assignee: Outset Medical, Inc.
• Original Assignee: Outset Medical, Inc.
• Inventors: Wrazel, Julie, Lingam, Gopi, Miller, Erik, Hires, Clayton
• Primary Examiner(s): Fitzsimmons, Allison
• Application Number:
  US13/645,336
• Publication Number:
  US 20130092361A1
• Time in Patent Office: 1,307 Days
• US Class Current: 1/1
• CPC Class Codes: A61M 1/1635 with volume chamber balancing devices between used and fresh dialysis fluid
• CPC Class Codes: A61M 1/1656 Apparatus for preparing dialysates
• CPC Class Codes: A61M 1/1662 with heat exchange between fresh and used dialysate
• CPC Class Codes: A61M 2205/3633 thermally insulated
• CPC Class Codes: C02F 1/001 Processes for the treatment of water whereby the filtration technique is of importance C02F1/44 takes precedence; construction of filters in general B01D24/00 - B01D41/00
• CPC Class Codes: C02F 1/02 by heating methods of steam generation F22B; preheating boiler feed-water or accumulating preheated boiler feed-water F22D
• CPC Class Codes: C02F 1/20 by degassing, i.e. liberation of dissolved gases degasification of liquids in general B01D19/00; arrangement of degassing apparatus in boiler feed supply F22D
• CPC Class Codes: C02F 1/283 using coal, charred products, or inorganic mixtures containing them
• CPC Class Codes: C02F 1/441 by reverse osmosis
• CPC Class Codes: C02F 1/444 by ultrafiltration or microfiltration
• CPC Class Codes: C02F 2103/026 Treating water for medical or cosmetic purposes
• CPC Class Codes: C02F 2209/03 Pressure
• CPC Class Codes: C02F 2209/05 Conductivity or salinity
• CPC Class Codes: C02F 2209/40 Liquid flow rate
• CPC Class Codes: C02F 2303/04 Disinfection
• CPC Class Codes: C02F 2303/185 The treatment agent being halogen or a halogenated compound
• CPC Class Codes: C02F 9/20 Portable or detachable small-scale multistage treatment devices, e.g. point of use or laboratory water purification systems
• CPC Class Codes: F28D 7/12 the surrounding tube being closed at one end, e.g. return type F28D7/14 takes precedence
• CPC Class Codes: F28F 2260/02 having microchannels
• CPC Class Codes: F28F 3/08 Elements constructed for building-up into stacks, e.g. capable of being taken apart for cleaning
• CPC Class Codes: Y02W 10/37 : using solar energy

Abstract

Disclosed herein are small, lightweight, portable, systems that have the capability of reliably, reproducibly, highly efficiently and relatively inexpensively providing a source of purified water of sufficient volumes for home dialysis. In addition, the systems disclosed herein require much less purified water at any one time than the volumes typically needed for dialysis today, thereby further reducing the expense of running the system at home.

Claims

1. A water treatment device, comprising:

at least first and second laminae arranged in a stacked relationship so as to form a stack of laminae, each lamina having a fluid flow field;

an inlet pathway comprising the fluid flow field of the first lamina, the inlet pathway having a heat exchange region;

an outlet pathway comprising the fluid flow field of the second lamina, the outlet pathway having a heat exchange region;

a metal transfer layer disposed between the heat exchange region of the inlet pathway and the heat exchange region of the outlet pathway, the metal transfer layer being configured to transfer heat between fluid flowing in the inlet pathway and fluid flowing in the outlet pathway;

a first cut-out in the first lamina, wherein the first cut-out is separate from and surrounds at least a portion of the fluid flow field of the first lamina without intersecting the first lamina fluid flow field;

a second cut-out in the second lamina, wherein the second cut-out is separate from and surrounds at least a portion of the fluid flow field of the second lamina without intersecting the second lamina fluid flow field, and wherein the first and second cut-outs vertically align with one another in the stack to form a collective cut-out that extends through the stack; and

a first plate on the top of the stack and a second plate on the bottom of the stack, wherein the first and second plates enclose the top and bottom of the collective cut-out creating an insulating chamber to the fluid flow fields of the stack.

2. The device of claim 1, wherein each of the first and second cut-outs surrounds a respective flow field along at least three sides of the flow field.

3. The device of claim 1, wherein each of the first and second cut-outs surrounds at least eighty percent of its respective flow field.

4. The device of claim 1, wherein the stack includes more than two laminae.

5. The device of claim 1, wherein a partial vacuum is formed within the insulating chamber.