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Run your analysis now →https://www.patsnap.com/resources/blog/rd-blog/dialysate-preparation-and-water-treatment-patent-landscape/ · Patsnap · data cut-off 2026-07-31 · downloaded from the live page
Patent Landscape · Blood PurificationDialysate Preparation and Water Treatment Patents: Filing Trends and Open Claim Space
- Filing has cooled from its 2020 peak. 21 filings in 2020 against 2021→2024 growth of -17%, with 2024 the last year the trend can be read as complete.
- One assignee sits well clear of the field. The leader holds 68 records against a fifth-place company at 28 and tenth place at 19 — a steep drop after the top handful.
- Device claims dominate; informatics claims are thin. A61M covers 89.1% of the 338 records in scope, while G06F and G16H — digital monitoring and healthcare informatics — sit at 9.8% and 8.0%.
338
Published Records
-17%
Filing Growth 2021→2024
US
Leading Jurisdiction
82
Active Filers Ranked
Filing growth compares 2021 (6 records) with 2024 (5) — a three-year span. 2024 is the most recent year we treat as complete: publication lags filing by roughly 18 months, so 2025 onwards are still filling in and any growth rate that ends there would understate the field.
Published byPatsnap Research··7 min readSourced from Patsnap Eureka
Overview
What this landscape covers
This landscape maps 338 published patent families filed between 2015 and mid-2026 that touch dialysate preparation and dialysis water treatment: reverse osmosis loops, endotoxin filtration, bicarbonate concentrate handling, microbial monitoring and loop disinfection. The search combines dialysate-preparation and water-treatment terminology with the specific hardware and process terms engineers use in this sub-field, so the corpus is narrower than the general dialysis-machine literature and skews toward the fluid path rather than the extracorporeal circuit.
Records here span jurisdictions including the United States, the European Patent Office, the United Kingdom, Canada, the WIPO PCT route and Australia, giving a reasonable read on where applicants are seeking protection rather than just where they are headquartered.
Filing activity and technology composition, 2015–2026
Source: Patsnap Eureka. Assignee ranking and totals. Derived from a Patsnap search on Dialysate Preparation and Water Treatment covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.Run this in Eureka MCP
The Numbers
Filing trend and technology composition
Two views of the same 338-record corpus: how filing activity has moved year over year, and which IPC subclasses carry the claim density.
Filing trend, 2017–2026
Filings rose to a peak of 21 in 2020, then eased; the 2021→2024 span shows -17% growth on the figures used for this page. 2025 and 2026 are shown for completeness but are not yet reliable, since publication typically lags filing by around 18 months.
IPC subclass composition
A61M (devices for body fluids) appears in 89.1% of the 338 records, confirming this is fundamentally a hardware landscape. B01D (separation processes) at 42.9% and C02F (water treatment) at 29.9% show the filtration and water-quality side is well populated too, while A61L (sterilising/disinfecting) at 20.1% and F16K (valves) at 18.9% round out the physical plumbing. G06F and G16H, covering digital control and healthcare informatics, sit well below 10% each — a record can carry multiple classes, so these figures sum above 100%.
Shares are the percentage of the 338 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Source: Patsnap Eureka. Filing trend and technology composition. Derived from a Patsnap search on Dialysate Preparation and Water Treatment covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.
Go deeper on Dialysate Preparation and Water Treatment with Eureka
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Representative and most-cited filings
Representative Filing
US5674390A — Dialysis machine with leakage detection
BAXTER INTERNATIONAL INC.
A dialysis machine that integrates water treatment, dialysate preparation and the extracorporeal circuit within a single housing designed to catch and detect fluid leakage anywhere in the machine. A non-horizontal floor forms a catchment chamber with a fluid sensor; a drain routes fluid leaking from the extracorporeal circuit module down to where the sensor can detect it, alongside leaks from the water treatment or dialysate preparation modules.Filed by Baxter International; granted 1997-10-07.
Most-cited records in this corpus
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US5247434A | Method and apparatus for kidney dialysis | 922 |
| 2 | US5591344A | Hot water disinfection of dialysis machines, including the extracorporeal circuit thereof | 687 |
| 3 | US5486286A | Apparatus for performing a self-test of kidney dialysis membrane | 577 |
| 4 | US5744027A | Apparatus for kidney dialysis | 515 |
| 5 | US5863421A | Hemodialysis machine with automatic priming by induced pressure pulses | 426 |
| 6 | US6284131B1 | Method and apparatus for kidney dialysis | 388 |
| 7 | US20100192686A1 | Blood treatment systems and methods | 368 |
| 8 | WO1996025214A1 | Modular home dialysis system | 366 |
| 9 | US5487827A | Method and apparatus for kidney dialysis | 361 |
| 10 | US5725776A | Methods for ultrafiltration control in hemodialysis | 319 |
Citation counts favour older filings that have had more time to accumulate citations within the searched corpus; treat them as a signal of influence on the field, not of current commercial relevance.
Each row carries its publication number; clicking a row searches Eureka by that number.
Source: Patsnap Eureka. Citation counts and representative records. Derived from a Patsnap search on Dialysate Preparation and Water Treatment covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.Run this in Eureka MCP
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What the data means for R&D and IP planning
Three read-throughs from the filing pattern, the IPC spread and the citation table.
Filing momentum
-17% (2021→2024)
growth over three complete years
Activity has cooled from a 2020 peak, not collapsed
The corpus peaked at 21 filings in 2020 and eased to a -17% span between 2021 and 2024, the last year the trend can be treated as complete. That is a cooling in a mature claim space, not evidence the field is closing — 2025 and 2026 figures are still filling in due to the usual publication lag.
Read alongside the leader's own year-over-year momentum, which also shows a sharp drop in the latest recorded year.
Claim concentration
68 vs 28 vs 19
leader vs 5th vs 10th place, by family count
A steep drop-off after the top few filers
The leading assignee holds 68 families, more than double the fifth-placed company's 28, which is itself well ahead of the 19 held in tenth place among the 82 companies in this ranking. New entrants are filing into a field where a small group already holds dense prior art on the core hardware.
This is a family-count comparison, not a market-share claim — the ranking counts patent families, not commercial deployments.
Technology skew
89.1% vs 8.0%
A61M share vs G16H share of 338 records
Hardware claims dwarf informatics claims
Physical apparatus (A61M) touches 89.1% of records while healthcare informatics (G16H) touches only 8.0%. Digital monitoring, remote diagnostics and data-driven microbial or endotoxin alerting are present but thin relative to the plumbing and filtration claims around them.
A record can sit in several IPC subclasses at once, so this is a density comparison, not a partition of the corpus.
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Looking for what nobody has claimed yet?
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to dialysate preparation and water treatment, with the prior art for and against each one.
Source: Patsnap Eureka. Co-assignee relationships and derived observations. Derived from a Patsnap search on Dialysate Preparation and Water Treatment covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.Run this in Eureka MCP
Players
Who holds the claim space
The assignee ranking covers 82 companies counted by patent family. Filing is led by a single company well clear of the pack, with several familiar dialysis-equipment names filling out the next tier and a long tail of single- or few-filing entrants below them.
Leader
68 families
documented filings
A clear leader in dialysate preparation hardware
The top-ranked assignee's family count is more than double that of the fifth-placed company, consistent with a firm that has built out water treatment and dialysate preparation as part of an integrated dialysis-machine platform rather than a point-product line.
Recent-year momentum for several of the largest holders, including this leader, shows 0 filings in the latest recorded year — read this against the 18-month publication lag before concluding activity has stopped.
Mid-tier
28 / 19 families
5th place / 10th place
A competitive second tier, not a duopoly
Fifth and tenth place sit at 28 and 19 families respectively, meaning the field below the leader is genuinely contested among several established dialysis and medical-device manufacturers rather than split between just two players.
Co-assignee pairings in the data show close filing relationships between some of these companies, suggesting shared R&D or corporate restructuring rather than pure competition.
Momentum
0 in latest year
for several top-ranked assignees
Latest-year filings are down across the largest holders
Recent-year momentum data shows multiple leading assignees, including the top-ranked company, recording 0 filings in the most recent year with -100% year-over-year figures. This pattern is consistent across enough large holders that it likely reflects publication lag rather than a genuine industry-wide halt.
Treat single-year momentum figures for 2025-2026 as provisional until later publication catches up.
Recent-year filing momentum by assignee
| Assignee | Recent year | YoY |
|---|---|---|
| Axcess International Inc. | 0 | — |
| Baxter International Inc. | 0 | -100% |
| Outset Medical, Inc. | 0 | -100% |
| Baxter Healthcare SA | 0 | -100% |
| Fresenius Medical Care Holdings, Inc. | 0 | -100% |
| DEKA Products Limited Partnership | 0 | — |
| Home Dialysis Plus, Ltd. (HDH LLC) | 0 | — |
| Gambro Lundia AB | 0 | — |
Source: Patsnap Eureka. Assignee-level momentum. Derived from a Patsnap search on Dialysate Preparation and Water Treatment covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.Run this in Eureka MCP
What's Next
Where to take this analysis
The dataset points to specific next steps depending on whether you are scoping freedom-to-operate, evaluating an acquisition target, or deciding where to file next.
Run a freedom-to-operate check on the top hardware claims
With A61M claims covering 89.1% of the 338 records, any new dialysate-preparation hardware design should be checked against the leading assignee's family before committing to a design direction.
Explore claims in EurekaScope the informatics white space
G06F and G16H sit under 10% of records each, well below the hardware classes — a narrower field to search before filing on digital monitoring or remote diagnostics for dialysate systems.
Map white space in EurekaWatch the mid-tier for consolidation signals
Co-assignee pairings between several major holders suggest restructuring activity worth tracking if you are assessing competitive position or acquisition targets in this space.
Track assignees in EurekaSource: Patsnap Eureka. Forward-looking reading of the same dataset. Derived from a Patsnap search on Dialysate Preparation and Water Treatment covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.Run this in Eureka MCP
FAQ
Common questions on this landscape
One assignee leads this landscape with 68 documented patent families, more than double the fifth-ranked company's 28. The ranking covers 82 companies in total, counted by patent family, so this is a fragmented field below the leader rather than a two-company market. Several established dialysis-equipment manufacturers occupy the next tier, and co-assignee pairings in the data suggest some corporate relationships between the largest holders.
Filing peaked at 21 records in 2020 and the 2021-to-2024 span shows -17% growth, using the last year that can be treated as a complete filing year. Figures for 2025 and 2026 look lower still, but that reflects the roughly 18-month lag between filing and publication rather than an actual drop in activity. The honest read is a cooling from a 2020 peak, not a field in decline.
Physical apparatus claims under A61M appear in 89.1% of the 338 records in scope, confirming this is primarily a hardware landscape covering reverse osmosis loops, filtration and dialysate-handling equipment. Separation processes (B01D) and water treatment (C02F) follow at 42.9% and 29.9% respectively. Digital and informatics classes — G06F and G16H — sit under 10% each, marking them as comparatively under-claimed relative to the mechanical and fluid-handling side.
The clearest gaps sit around digital monitoring and informatics: remote microbial-monitoring alerting, predictive loop-disinfection scheduling and AI-driven bicarbonate concentrate dosing all show thin filing density relative to the core hardware classes. G16H healthcare informatics touches only 8.0% of the 338 records, against 89.1% for A61M devices. A first claim in these branches would likely combine an established hardware element, such as a reverse osmosis loop or endotoxin filter, with a specific sensing or predictive-control step not yet densely claimed.
US5674390A, granted to Baxter International in 1997, claims a dialysis machine that integrates water treatment, dialysate preparation and the extracorporeal circuit in a single housing built to catch and detect leaks anywhere in the system. Its non-horizontal floor forms a catchment chamber with a fluid sensor, and a drain conducts fluid from the extracorporeal circuit down to that sensor alongside leaks from the other two modules. Anyone designing an integrated leak-detection scheme across these three subsystems should review this filing's claim scope before finalising a mechanical layout.
Answers are grounded in the same dataset. Derived from a Patsnap search on Dialysate Preparation and Water Treatment covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.Run this in Eureka MCP
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Disclaimer. This page is generated from Patsnap Eureka data drawn from a limited snapshot of global patent and scientific-literature records, and is provided for general information and reference only.
Patent data carries inherent limitations: recent filings (typically the most recent 18–24 months) are under-counted due to standard publication lag; counts may be reported at either a patent-family or a patent-record basis and are not always directly comparable; classification, applicant-name, and citation data may contain errors, duplicates, or omissions; and the underlying search query defines and constrains the scope shown. As a result, the analysis may be incomplete or inaccurate and may not reflect the full technology landscape.
Nothing on this page constitutes an exhaustive prior-art, novelty, freedom-to-operate, or validity search, nor does it constitute legal, financial, investment, or professional advice, and it should not be relied upon as such. Any patent, commercial, or strategic decision should be verified independently and reviewed with qualified patent, legal, and domain professionals. Patsnap makes no warranties, express or implied, as to the accuracy, completeness, or fitness for any particular purpose of the information presented.
Machine translation. Assignee and organisation names originally recorded in Chinese, Japanese or Korean have been rendered into English by an AI translation step so that the tables stay readable. These renderings are best-effort and may not match a company's registered English name; the original name is what the underlying patent record carries, and it is what any Eureka query launched from this page uses.