The DS-1901 system is intended for the noninvasive measurement of systolic and diastolic blood pressure and determination of pulse rate in adult patients, i.e., age 12 and above. The product is recommended for use by patients with labile blood pressure or know hypertension in a home care environment as an adjunct to medical management.
Device Story
Automatic sphygmomanometer for home use by patients; measures systolic/diastolic blood pressure and pulse rate via brachial artery using arm cuff. Device includes air pump for automatic inflation, electric valve, and pressure oscillation sensors. Unlike predicate (deflation-based), this device measures during inflation. Features 'Personal mode' to determine inflation pressure based on historical data; includes arm circumference detection circuit to compensate measurements for 23-43 cm range. Output displayed on LCD; memory stores 30 readings with computed average. Healthcare providers use stored data to monitor hypertension or labile blood pressure trends, aiding clinical management decisions.
Clinical Evidence
Clinical performance and accuracy validated per ANSI/AAMI SP10-2002. Bench testing included electromagnetic compatibility and interference testing per IEC 60601-1-2 and associated IEC 61000 series standards.
Technological Characteristics
Automatic sphygmomanometer; brachial artery oscillometric sensing. Powered by 4 AA batteries or 6V AC adapter. Includes air pump, electric valve, and LCD. Features arm circumference detection circuit for 23-43 cm range. Software-based processing of pressure oscillations. Complies with ANSI/AAMI SP10-2002 and IEC 60601-1-2.
Indications for Use
Indicated for noninvasive measurement of systolic/diastolic blood pressure and pulse rate in adult patients (age 12+). Recommended for home use by patients with labile blood pressure or known hypertension as an adjunct to medical management.
Regulatory Classification
Identification
A noninvasive blood pressure measurement system is a device that provides a signal from which systolic, diastolic, mean, or any combination of the three pressures can be derived through the use of tranducers placed on the surface of the body.
Predicate Devices
Nissei Model DS-181 Digital Blood Pressure Monitor (K993890)
Submission Summary (Full Text)
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#### SAFETY & EFFECTIVENESS DATA SUMMARY
Submitters Name, Address & Phone Number: Nihon Seimitsu Sokki., Co., Ltd. (Nissei) 2508-13, Nakago, Komochi-Mura Kitagunma-Gun, Gunma-Ken 377-0293, Japan +81-0279-20-2311
Submission Correspondent:
Lyle Howard Corporation 203 Main Street, 166 Flemington, NJ 08822 USA Attention: Lynette Howard 908-788-4580
Classification Name: Common / Usual Name: Proprietary Name:
Noninvasive Blood Pressure Monitor Blood Pressure Monitor Model DS-1901 Digital Blood Pressure Monitor
Establishment Registration Number: 9610827
Classification: Class II, Reg. # 870.1130, DXN, Cardiovascular Devices Panel
Performance Standards: Sections 898 and 1010 of the Federal Food, Drug and Cosmetic Act
Substantial Equivalence:
The legally marketed device to which substantial equivalence will be demonstrated is the Nissei Model DS-181 Digital Blood Pressure Monitor. This device was cleared for marketing under 510(k) No. K993890, SE decision December 3, 1999.
The subject device is essentially an updating of the predicate device. As can be seen in Appendix S, many of the features and performance specifications are identical. Note particularly that both systems contain a built-in air pump for automatic cuff inflation. have the same measurement accuracy for both blood pressure and pulse rate, are powered by four "AA" batteries, and include an optional AC adaptor.
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The principal differences are that the new DS-1901 includes the circuit detecting arrr circumference and the algorithm revising it to compensate the measurement result and to embody the application of a cuff to arm with circumference of 23 to 43 cm, which the predicate device DS-181 did not and that while the predicate device takes blood pressure measurement during deflation, the subject device takes measurement during inflation. "Personal mode", which determines inflation value from past measurements, is employed with new device. The clock function is also added to the subject device.
Because the difference between the subject device and the predicate device represent functional improvements that have been evaluated through both bench testing and clinical evaluation, it is clear that these changes raise no new questions with respect to either safety or effectiveness.
## Testing conducted or standards applied to assure safety and effectiveness includes but is not limited to:
Clinical Performance and Accuracy: ANSI/AAMI Standard SP10-2002, Electronic or Automated Sphygmomanometers, approved October 28, 2002.
Electromagnetic Compatibility: IEC 60601-1-2, 2001 with test procedures according to IEC 61000-4-2, 2001; IEC 61000-4-3, 2001; IEC 6100-4-4, 2001 with Amendment 1, 2000 and Amendment 2,2001; IEC 6100-4-6, 2001; IEC 61000-4-8, 2001; IEC 61000-4-11. 2001.
Electromagnetic Interference: IEC 60601-1-2, 2001.
#### Description of the new device:
The Model DS-1901 Digital Blood Pressure Monitor is an automatic sphygmomanometer intended for measurement, including self-measurement by the patient, of systolic and diastolic blood pressure and pulse rate in adult patients in a homecare environment. Blood pressure is measured in the brachial artery using an arm cuff of the appropriate size. The unit includes an air pump for automatic cuff inflation, an electric valve, pushbutton controls, circuitry to detect and process minute pressure oscillations, an I.CD display of systolic and diastolic blood pressure readings and pulse rate, a wide-ranged arm cuff and a carrying case. The memory circuit stores the thirty most recent readings plus the computed average of the stored readings, which will be retained after power turn-off or battery removal and can be intentionally deleted. The system is powered by four AA-size batteries or, optionally, by a 6V AC adapter.
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### Intended Use:
The DS-1901 system is intended for the noninvasive measurement of systolic and diastolic blood pressure and determination of pulse rate in adult patients, i.e., age 12 and above. The product is recommended for use by patients with labile blood pressure or know hypertension in a home care environment as an adjunct to medical management.
### Safety and Efficacy Information:
The DS-1901 Blood Pressure Monitors are well recognized as being safe and effective for the stated intended use. The Nihon DS-1901 Blood Pressure Monitors have the same operating principals and intended uses as the predicate Blood Pressure Monitor systems already in commercial distribution.
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Image /page/3/Picture/1 description: The image shows the logo for the U.S. Department of Health & Human Services. The logo consists of a circular seal with the text "DEPARTMENT OF HEALTH & HUMAN SERVICES - USA" around the perimeter. Inside the circle is a stylized eagle or bird symbol with three curved lines representing its wings or feathers.
Public Health Service
MAR 2 5 7005
Food and Drug Administration 9200 Corporate Boulevard Rockville MD 20850
Nihon Seimitsu Sokki, Co., Ltd. (Nissei) c/o Dr. J. A. van Vugt KEMA Quality B.V. Utrechtseweg 310, 6812 AR Arnhem P.O. Box 5185, 6802 ED Arnhem THE NETHERLANDS
Re: K050697
K050077
Trade Name: Model DS-1901 Digital Blood Pressure Monitor -Regulation Number: 21 CFR 870.1130 Regulation Name: Noninvasive Blood Pressure Measurement System Regulatory Class: II (two) Product Code: DXN Dated: March 17, 2005 Received: March 18, 2005
Dear Dr. van Vugt:
We have reviewed your Section 510(k) premarket notification of intent to market the device We have reviewed your Section 910(x) premained in substantially equivalent (for the indications
referenced above and have determined the device is substantially interests a for use stated in the enclosure) the device interest predicate devices marketed in interstate for use stated in the encrosule) to regary manetoe province Amendments, or to commerce prior to May 28, 1776, the enactions of the provisions of the Federal Food. Drug.
devices that have been reclassified in accordance with the provisions of capliation devices that have been recarsined in acceraance what a premarket approval application (PMA).
and Cosmetic Act (Act) that do not require approval of a premarket approval appli You may, therefore, market the device, subject to the general controls provisions of the Act. The You may, merelore, market the device, beginer is for annual registration, listing of general controls provisions of the Hereas Capital of Childrens against misbranding and adulteration.
If your device is classified (see above) into either class II (Special Controls) or class III (PMA), it If your device is classified (see above) me existing major regulations affecting your device can
may be subject to such additional controls. Existing major regulations on Wa may be subject to suell additional combolis of the 21, Parts 800 to 898. In addition, FDA may be found in the Our acements concerning your device in the Federal Register.
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Page 2 – Dr. J. A. van Vugt
Please be advised that FDA's issuance of a substantial equivalence determination does not mean Please be advised that I DA 3 issuation of a backer complies with other requirements of the Act that I DA has made a actorinations administered by other Federal agencies. You must of ally it edical statutes and regalations and limited to: registration and listing (21 Comply with an the Act 3 requirements, not, good manufacturing practice requirements as set CFR I art 807), fabeling (21 OF R Part 820); and If applicable, the electronic forum in the quality systems (Sections 531-542 of the Act); 21 CFR 1000-1050. product launation control pro herems (we wice as described in your Section 510(k) This letter with anow you to ogin mantoung your and equivalence of your device to a legally premaired notification: The PDA mailing of casting for your device and thus, permits your device to proceed to the market.
If you desire specific advice for your device on our labeling regulation (21 CFR Part 801), please If you desire specific advice ion your as (240) 276-0120. Also, please note the regulation entitled, contact the Office of Compunation in (21 m) (21CFR Part 807.97). You may obtain other general information on your responsibilities under the Act from the Division of Small other general informational and Consumer Assistance at its toll-free number (800) 638-2041 or (301) 443-6597 or at its Internet address http://www.fda.gov/cdrh/dsma/dsmamain.html
Sincerely yours,
B. Zimmerman for
Bram D. Zuckerman, M.D. Director Division of Cardiovascular Devices Office of Device Evaluation Center for Devices and Radiological Health
Enclosure
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# Indications for Use
510(k) Number (if known):
Model DS-1901 Digital Blood Pressure Monitor Device Name: _________________________________________________________________________________________________________________________________________________________________
Indications For Use:
The DS-1901 system is intended for the noninvasive measurement of systolic and diastolic blood pressure and determination of pulse rate in adult patients, i.e., age 12 and above. The product is recommended for use by patients with labile blood pressure or know hypertension in a home care environment as an adjunct to medical management.
Prescription Use _ (Part 21 CFR 801 Subpart D) AND/OR
Over-The-Counter Use (21 CFR 807 Subpart C)
(PLEASE DO NOT WRITE BELOW THIS LINE-CONTINUE ON ANOTHER PAGE IF NEEDED)
Concurrence of CDRH, Office of Device Evaluation (ODE)
A. Ammerman
Division Sign Off
Division Sign-Off) Division of Cardlovascular Devices 510(k) Number_ 050697
Page 1 of 1 -
Two short videos show you everything — or skip straight to the written tutorial if you'd rather read. You can reopen this any time from the Tutorial button in the top bar.
Part 1 — Search, results, and everyday workflows 16 min
Part 2 — Embeddings: the galaxy map 3 min
1. Search: exact and fuzzy
Type a phrase like "coronary artery calcification" into the search box. You get two kinds of results. Exact results match the literal phrase — prefix searches work ("coronary artery calcificati") but suffix searches do not. Fuzzy results match on the meaning and intent of your phrase rather than the exact words, and are sorted by relevance score. Hover over the Exact or Fuzzy badge on any row to see exactly why it matched.
Use the checkboxes above the results to narrow: SaMD keeps only software-only devices, AI / ML keeps only devices with AI.
Exact vs. fuzzy search: what's the difference?
Exact matches on the literal phrase (prefix search works, suffix does not). Fuzzy matches on the meaning and intent of the phrase rather than the exact words. Hover over the badge on any row to see why it matched.
You search "coronary artery calcification" and want only software devices with AI. What two filters do you apply?
Narrow by SaMD (software-only devices), then narrow by AI/ML (devices with AI).
2. The results table
Scroll right in the results table. The intended use is extracted for you — no need to open the PDF. The device story gives a high-level snapshot of what the device does and how it's used. The AI Performance sub-table shows each output name, acceptance criteria, observed values, and development/test dataset descriptions — the same format Innolitics uses for regulatory strategy outputs, and the fastest high-level fingerprint of an AI device. It is AI-generated but has been very reliable in practice.
Where do you find a device's intended use without opening the PDF?
Scroll right in the search results table. The intended use column is extracted for you; no need to dig into the 510(k) summary PDF.
What does the AI Performance sub-table show, and why is it useful?
Output name, acceptance criteria, observed values, development dataset description, and test dataset description. It's the same format we use for regulatory strategy output and Fast 510(k) input, and the fastest high-level fingerprint of an AI device. AI-generated but reliable in practice.
3. Judging fuzzy relevance
Fuzzy results trail off in relevance as you scroll. Use three signals to decide how far down to go: the fuzzy badge explanations, the intended use column, and whether your target output (e.g., Cobb angle) still appears in the AI Performance sub-table. Once it stops appearing, you're past the relevant zone. A top hit with a low score (~0.4) and a stretched explanation is a hint the closest predicates are far away — the project may be headed for De Novo. Note the fuzzy search is a pattern match: it doesn't handle negation ("not") well, and hardware devices can appear — filter by SaMD/AI ML to cut them.
How do you judge how far down fuzzy search results to go?
Use the relevancy signals: the fuzzy badge explanations, the intended use column, and whether the target output (e.g., Cobb angle) still appears in the AI Performance sub-table. Once it stops appearing, results are trailing off in relevancy.
4. Device detail page: chat and citations
Click a device name to open its detail page: device facts on the left, a chat window on the right. Ask something like "Describe the training data". The answer carries little citation bubbles — click one to jump to the highlighted passage in the source PDF, so you can verify every AI answer against the document. There's also a Download PDF button for sharing.
How do you verify an AI chat answer on the device detail page?
Click the citation bubbles to jump to the relevant highlight in the source document.
Reading rule for every project: how many summaries do you read in full?
At least the three most relevant 510(k) or De Novo summaries, in full. After that, use targeted chat questions to confirm your memory quickly. The tool supports this professional habit — it doesn't replace it.
5. Side-by-side comparison
Select multiple rows in the results table (aim for under ~10), then open the PDF Viewer tab. Ask one question — it goes to all selected devices in parallel, each with citations. This is the fastest way to compare and contrast devices: training data, PCCP scope, how they handled adding new scanners, and so on.
What does the side-by-side PDF viewer mode do?
Select multiple devices, open the PDF viewer tab, and ask one question (e.g., "Describe the training data"). It queries all selected devices simultaneously with citations, so you can compare and contrast quickly.
6. Collections
With rows selected, go to the Collections tab and create a labeled collection (e.g., "Cobb Angle Project"). Reload that selection any time — before a client call, pull up the collection and ask questions across all of its devices at once.
How do you save a set of selected devices for later use?
Select the rows, go to the Collections tab, and create a labeled collection (e.g., "Cobb Angle Project"). You can reload the selection anytime and carry it into the PDF viewer and other tabs that support selections.
7. Product codes and the regulations tree
Click a product code in the results to jump to it in the regulations tree — identification text, sibling product codes, and devices you can open in a PDF viewer on the right. Click a regulation number to see its identification, special controls, and related product codes. You can also search by product code or regulation number at the top of the tree. Always read the special controls if any exist for your device — it broadens your search and sharpens pre-kickoff research.
What can you do from the regulations tree view?
Browse product codes and regulation numbers, read the identification text and special controls, browse sibling product codes, open device PDFs on the right, and search by product code or regulation number at the top of the tree.
8. Chart view
Click Show Chart and segment by regulation number (or product code) to see which regulations dominate your result set. Clicking a regulation takes you into the regulations tree. Great for spotting that most matches are, say, hardware laparoscopic devices — a cue to go back and filter.
How do you see which regulations dominate a search result set?
Click "Show Chart" and segment by Regulation Number. Clicking a regulation takes you to the regulations tree.
9. The predicate graph
Open the Predicates tab for a family-tree view of predicate relationships. Click a node to trace its parents and children; selections from search carry over pre-selected. Commonly predicated devices are worth reading — a lot of people predicated them for a reason. The visual lineage is also handy on client calls, e.g. to show how a predicate family evolved and justify why your predicate still holds.
In the predicate graph, why are commonly predicated devices worth reading?
A lot of people predicated them for a reason. Clicking a node traces parents and children, and selections from search carry over pre-selected.
10. Embeddings: the galaxy map
The Embeddings tab plots every matching document in a 2-D "galaxy map" where semantically similar devices cluster together. Hover or click clusters to explore, and let AI label the clusters for you. Embeddings beat product codes for grouping: two devices can carry different product codes (LLZ vs. QIH) yet do the same thing — the embedding captures the meaning of the intended use and device story. This is also exactly how retrieval-augmented generation (RAG) works under the hood, and it makes a great visual on client calls.
Try it yourself
Head to the search page and work through a few of these AI/ML fuzzy searches to build intuition: perivascular fat on CT · aortic valve calcification opportunistic screening on noncontrast CT · breast cancer prediction on digital pathology slides · autism detection · gestational age prediction · a hearing aid that can also detect a pulse · foundation model based analysis of ECG · large language models · penetration test. Watch how the relevance scores, intended use, and AI Performance tables tell you when results stop being meaningful.