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Run your analysis now →https://www.patsnap.com/resources/blog/rd-blog/photoplethysmography-and-wearable-vital-signs-patent-landscape/ · Patsnap · data cut-off 2026-07-31 · downloaded from the live page
Patent Landscape · Wearables & Health MonitoringPhotoplethysmography and wearable vital-sign monitoring patents
- Concentrated at the top. the five leading assignees account for 90.9% of all 11 records in scope, with the sixth bringing coverage to 100.0%.
- One class dominates. every record in scope carries an A61B diagnosis-and-surgery classification, while electrotherapy, AI-based computing and healthcare informatics appear only on the margins.
- Filing has cooled since the 2020 peak. four records published that year versus one in 2021 and none by 2024 -- though 2025-2026 figures are still filling in as publication catches up to filing.
11
Published Records
91%
Top-5 Share of All Records
-100%
Filing Growth 2021→2024
US
Leading Jurisdiction
Filing growth compares 2021 (1 records) with 2024 (0) — 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. Top-5 share is the combined record count of the five largest assignees divided by all 11 records in scope (CR5), not by the ranked leaders only.
Published byPatsnap Research··7 min readSourced from Patsnap Eureka
Overview
What this landscape covers
This landscape tracks patent families at the intersection of photoplethysmography sensing and wearable vital-sign monitoring, narrowed to records that also address skin-tone bias, motion-artefact removal, wavelength selection, perfusion index, power consumption, or clinical-grade accuracy claims. The scope is deliberately narrow: 11 published records total, filed or published between 2015 and the 2026-07-31 cut-off.
Small corpora like this one reward close reading over aggregate statistics. With only 11 records, a single filer's activity or inactivity can swing the trend line, and the most useful signal is often which specific claims exist rather than how many.
Filing activity and technology composition, 2015-2026
Source: Patsnap Eureka. Assignee ranking and totals. Derived from a Patsnap search on Photoplethysmography and Wearable Vital Signs 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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The Numbers
Filing trend and technology composition
Two views of the same 11-record dataset: how filing activity has moved year over year, and which IPC subclasses the claims actually sit in.
Filing trend, 2017-2026
Filings rose from 2 in 2017 to a peak of 4 in 2020, then fell -- 1 in 2021 to 0 by 2024, a -100% move over that three-year span. 2025 and 2026 are shown but understated, since publication typically lags filing by around 18 months.
IPC subclass composition
A61B (diagnosis and surgery) covers 100.0% of all 11 records -- effectively the whole field as scoped here. A61N (electrotherapy and radiation therapy) appears on 18.2%, and G06N (AI-based computing) and G16H (healthcare informatics) each appear on 9.1%. Records can carry more than one class, so these shares sum above 100%.
Shares are the percentage of the 11 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 Photoplethysmography and Wearable Vital Signs covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.
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Most-cited records and a representative filing
Representative Filing
Photoplethysmography sensing devices with light guiding components, and systems and methods thereof (US20250311980A1)
CASANA CARE, INC.
Systems, devices, and methods for monitoring physiological data of subjects seated on a toilet, using a set of sensors integrated into a seat that measure multiple light signals across unique optical paths through tissue.Filed by Casana Care, Inc., published 2025-10-09 -- illustrates how PPG claim scope is extending into non-wrist form factors.
Most-cited records in this landscape
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US20180317854A1 | Adaptive Controller used in Photoplethysmography Sensing System | 12 |
| 2 | CN112006671A | 穿戴式生命体征监护设备 | 6 |
| 3 | WO2024073691A1 | Photoplethysmography sensing module, systems and devices thereof | 2 |
| 4 | US20210030368A1 | Adaptive controller used in photoplethysmography sensing system | 1 |
Citation counts reflect influence within this searched corpus and skew toward older filings; treat them as a signal of prior influence, not current importance.
Patent titles are shown in the language they were filed in, not translated, so that each record stays verifiable against the original filing — a translated title will not match in Eureka or in any national register. Publication numbers are shown where the record carries one (4 of 4 rows); clicking a row searches Eureka by that number.
Source: Patsnap Eureka. Citation counts and representative records. Derived from a Patsnap search on Photoplethysmography and Wearable Vital Signs 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 filing strategy
Three findings that shape where new claims can realistically land in this field.
Concentration
90.9% of 11 records
top 5 assignees combined
A small group holds most of the corpus
With the leader at 3 records and fifth place at 1, the five leading assignees together account for 90.9% of all 11 records in scope; the sixth ranked assignee brings the ranking to 100.0% coverage. That is a small, tightly held field rather than a fragmented one.
Six assignees rank in total -- this is the entire ranking the dataset returns, not a top-50 cut.
Classification
100.0% in A61B
share of all 11 records
Claims sit almost entirely in one diagnostic class
Every record in scope classifies under A61B, the diagnosis-and-surgery subclass. Adjacent classes -- electrotherapy (18.2%), AI-based computing (9.1%), and healthcare informatics (9.1%) -- appear on only a minority of filings, suggesting most protection is written around the sensing and measurement mechanism itself rather than downstream software or therapy integration.
Shares sum above 100% because records can carry multiple IPC classes.
Momentum
-100% (2021 to 2024)
three-year filing change
Activity has cooled from its 2020 peak
Filings peaked at 4 in 2020, fell to 1 in 2021, and reached 0 by 2024 -- a -100% move over that span. Recent-year momentum by assignee shows only one filer active in the latest year, while the rest show no recent activity. Because publication lags filing by roughly 18 months, 2025-2026 counts should not yet be read as a continued decline.
Peak year: 2020 at 4 records.
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Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to photoplethysmography and wearable vital signs, with the prior art for and against each one.
Source: Patsnap Eureka. Co-assignee relationships and derived observations. Derived from a Patsnap search on Photoplethysmography and Wearable Vital Signs 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
Competitive Landscape
Who holds the claims, and where the gaps sit
Six assignees make up the entire ranked field, with citation weight concentrated in a small number of adaptive-controller filings.
Leader
3 records
highest filer in ranking
A single filer sets the pace
The top-ranked assignee holds 3 of the 11 records in scope, ahead of a field where fifth place holds just 1. Two of the most-cited records in this landscape -- an adaptive-controller filing and its later continuation -- come from the same lineage, indicating sustained investment in one specific mechanism rather than one-off filings.
Most-cited record: 12 citations.
Long tail
1 record each
fifth and sixth place
The bottom of the ranking is thin
Below the leader, filing counts drop quickly. Fifth place holds only 1 record, and the sixth assignee's presence is what closes the ranking to 100.0% of all records -- there is no meaningful mid-tier of repeat filers in this dataset.
6 assignees rank in total.
Recent activity
1 filer active
in the latest year
Only one assignee is currently filing
Recent-year momentum shows a single institute with 1 filing in the latest year, while every other ranked assignee -- including the leader -- shows zero recent activity. That does not necessarily mean the leaders have exited the space; it may reflect the 18-month publication lag as much as a real pullback.
Leader's latest-year count: 0, down -100% YoY.
Recent-year filing momentum by assignee
| Assignee | Recent year | YoY |
|---|---|---|
| VEL TECH RANGARAJAN DR SAGUNTHALA R&D INST OF SCI & TECH | 1 | — |
| CASANA CARE INC | 0 | -100% |
| Jinkang Medical Electronics Co., Ltd. | 0 | — |
| Koninklijke Philips N.V. (Royal Philips) | 0 | — |
| National Chiao Tung University | 0 | — |
| Shenzhen Jinyidi Medical Equipment Co., Ltd. | 0 | — |
Source: Patsnap Eureka. Assignee-level momentum. Derived from a Patsnap search on Photoplethysmography and Wearable Vital Signs 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 rather than a single conclusion.
Check freedom-to-operate on adaptive-controller claims
The two most-cited records in this landscape both cover adaptive controllers for PPG sensing systems. Any new filing touching signal adaptation logic should be checked against this lineage specifically, not just the broader A61B class.
Explore adaptive-controller claims in EurekaWatch the 2025-2026 publication window
Filing appeared to fall to zero by 2024, but publication lags filing by roughly 18 months, so 2025-2026 records are still arriving. Re-check this trend in a future cut before concluding the field has gone quiet.
Track new publications in EurekaProbe non-wrist and non-finger form factors
The representative filing extends PPG sensing to a seat-integrated form factor, outside the wrist- and finger-worn devices that dominate consumer wearables. That is a concrete signal of where claim scope is still moving.
Map form-factor white space in EurekaSource: Patsnap Eureka. Forward-looking reading of the same dataset. Derived from a Patsnap search on Photoplethysmography and Wearable Vital Signs 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 about this landscape
This dataset's assignee ranking returns six companies covering all 11 records in scope. The leader holds 3 records, and the ranking is not a top-50 or top-100 cut -- it is the complete set of assignees the search returns for this scope. Concentration is high: the top five assignees together account for 90.9% of all 11 records, meaning most of the field's activity sits with a small group rather than being spread across many filers.
Filing peaked at 4 records in 2020, then dropped to 1 in 2021 and reached 0 by 2024, a -100% change over that three-year span. However, publication typically lags filing by around 18 months, so the 2025 and 2026 figures in this dataset are understated and should not yet be read as confirmation of a continued decline. A future data cut covering complete 2025 filings would give a clearer read on whether activity has genuinely stopped or is simply still filling in.
Every one of the 11 records in scope classifies under A61B, the diagnosis-and-surgery subclass, which functions as the core classification for this field as scoped here. Smaller shares touch A61N electrotherapy (18.2% of records), G06N AI-based computing (9.1%), and G16H healthcare informatics (9.1%). Because a single record can carry multiple IPC codes, these shares add up to more than 100%, and they should be read as showing where claims overlap rather than as mutually exclusive categories.
The most-cited record in this dataset is US20180317854A1, an adaptive controller for photoplethysmography sensing systems, with 12 citations. A related continuation, US20210030368A1, covering essentially the same adaptive-controller mechanism, carries 1 citation. Citation counts in a searched corpus like this one tend to favour older filings simply because they have had more time to accumulate references, so treat the count as a measure of historical influence rather than current relevance.
The clearest gaps sit in the classes that appear on only a small minority of the 11 records: AI-based signal processing (G06N, 9.1%) and healthcare informatics integration (G16H, 9.1%) are both thinly claimed relative to the near-universal A61B sensing coverage. The representative filing in this dataset, covering a seat-integrated light-guiding sensor, also signals that non-wrist and non-finger form factors remain comparatively open. Any of these branches warrants a dedicated freedom-to-operate search before assuming the space is genuinely clear, since thin coverage in a search result is not the same as no prior art existing.
Answers are grounded in the same dataset. Derived from a Patsnap search on Photoplethysmography and Wearable Vital Signs 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.