BT-220L/220C is a pocket sized ultrasonic fetal monitor that measures heart rate, which is displayed on an LCD display, and outputs fetal heart sounds through a built in speaker. The fetal heart rate is measured using Doppler ultrasound.
Device Story
Pocket-sized ultrasonic fetal monitor; measures fetal heart rate (FHR) and outputs fetal heart sounds. Operates by irradiating ultrasound waves to pregnant woman's abdomen; detects Doppler frequency signals; analyzes signals to calculate FHR. Displays FHR on LCD screen; provides audio output via built-in speaker. Used in clinical settings by healthcare providers to assess fetal well-being. Device provides real-time monitoring of fetal heart activity to assist in clinical decision-making regarding fetal health.
Clinical Evidence
No clinical data. Bench testing performed including HR accuracy measuring, acoustic output testing, and biocompatibility testing per ISO 10993.
Technological Characteristics
Pocket-sized fetal monitor; Doppler ultrasound sensing principle; continuous pulsed Doppler operating mode. Patient-contacting materials tested for biocompatibility per ISO 10993 (surface device, skin, <24 hrs). LCD display; built-in speaker.
Indications for Use
Indicated for pregnant women to monitor fetal heart rate and fetal heart sounds using Doppler ultrasound.
Regulatory Classification
Identification
A perinatal monitoring system is a device used to show graphically the relationship between maternal labor and the fetal heart rate by means of combining and coordinating uterine contraction and fetal heart monitors with appropriate displays of the well-being of the fetus during pregnancy, labor, and delivery. This generic type of device may include any of the devices subject to §§ 884.2600, 884.2640, 884.2660, 884.2675, 884.2700, and 884.2720. This generic type of device may include the following accessories: Central monitoring system and remote repeaters, signal analysis and display equipment, patient and equipment supports, and component parts.
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Food and Drug Administration 10903 New Hampshire Avenue Document Control Center - WO66-G609 Silver Spring, MD 20993-0002
July 9, 2015
Bistos Co., Ltd % Young Chi President Bio-Med USA Inc. 27 New England Drive Ramsey, New Jersey 07446
Re: K142799
> Trade/Device Name: Model BT-220L and BT-220C Regulation Number: 21 CFR 884.2740 Regulation Name: Perinatal monitoring system and accessories Regulatory Class: Class II Product Code: HGM Dated: June 2, 2015 Received: June 9, 2015
Dear Young Chi,
We have reviewed your Section 510(k) premarket notification of intent to market the device referenced above and have determined the device is substantially equivalent (for the indications for use stated in the enclosure) to legally marketed predicate devices marketed in interstate commerce prior to May 28, 1976, the enactment date of the Medical Device Amendments, or to devices that have been reclassified in accordance with the provisions of the Federal Food. Drug. and Cosmetic Act (Act) that do not require approval of a premarket approval application (PMA). You may, therefore, market the device, subject to the general controls provisions of the Act. The general controls provisions of the Act include requirements for annual registration, listing of devices, good manufacturing practice, labeling, and prohibitions against misbranding and adulteration. Please note: CDRH does not evaluate information related to contract liability warranties. We remind you, however, that device labeling must be truthful and not misleading.
If your device is classified (see above) into either class II (Special Controls) or class III (PMA), it may be subject to additional controls. Existing major regulations affecting your device can be found in the Code of Federal Regulations, Title 21, Parts 800 to 898. In addition, FDA may publish further announcements concerning your device in the Federal Register.
Please be advised that FDA's issuance of a substantial equivalence determination does not mean that FDA has made a determination that your device complies with other requirements of the Act or any Federal statutes and regulations administered by other Federal agencies. You must comply with all the Act's requirements, including, but not limited to: registration and listing (21 CFR Part 807); labeling (21 CFR Part 801); medical device reporting (reporting of medical device
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related adverse events) (21 CFR 803); good manufacturing practice requirements as set forth in the quality systems (QS) regulation (21 CFR Part 820); and if applicable, the electronic product radiation control provisions (Sections 531-542 of the Act); 21 CFR 1000-1050.
If you desire specific advice for your device on our labeling regulation (21 CFR Part 801), please contact the Division of Industry and Consumer Education at its toll-free number (800) 638-2041 or (301) 796-7100 or at its Internet address
http://www.fda.gov/MedicalDevices/ResourcesforYou/Industry/default.htm. Also, please note the regulation entitled, "Misbranding by reference to premarket notification" (21 CFR Part 807.97). For questions regarding the reporting of adverse events under the MDR regulation (21 CFR Part 803), please go to
http://www.fda.gov/MedicalDevices/Safety/ReportaProblem/default.htm for the CDRH's Office of Surveillance and Biometrics/Division of Postmarket Surveillance.
You may obtain other general information on your responsibilities under the Act from the Division of Industry and Consumer Education at its toll-free number (800) 638-2041 or (301) 796-7100 or at its Internet address
http://www.fda.gov/MedicalDevices/ResourcesforYou/Industry/default.htm.
Sincerely yours,
# Benjamin R. Fisher -S
Benjamin R. Fisher, Ph.D. Director Division of Reproductive, Gastro-Renal, and Urological Devices Office of Device Evaluation Center for Devices and Radiological Health
Enclosure
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# Indications for Use
510(k) Number (if known) K142799
Device Name Ultrasonic Fetal Doppler Model BT-220L and BT-220C
#### Indications for Use (Describe)
BT-220L/220C is a pocket sized ultrasonic fetal monitor that measures heart rate, which is displayed on an LCD display, and outputs fetal heart sounds through a built in speaker.
The fetal heart rate is measured using Doppler ultrasound.
| Type of Use (Select one or both, as applicable) | |
|------------------------------------------------------------------------------------------------|-----------------------------------------------------------------------------------------------|
| <span style="text-decoration: overline;">X</span> Prescription Use (Part 21 CFR 801 Subpart D) | <span style="text-decoration: overline;">☐</span> Over-The-Counter Use (21 CFR 801 Subpart C) |
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#### 510(K) Summary
As required by CFR 807.92(c)
## 1. Manufacturer
Prepared July 1, 2015
Bistos Co., Ltd. Reg Nr:3006179052 7th fl, A bldg WooLim Lions 3-cha 302 Galmachi ro, JungWon gu, Seoung Nam, GyungGi do, Rep of Korea Tel: 82 2 2108 4626 Fax : 82 2 2108 4629
## 2. Submitter, Contact person
Mr. Young Chi / President BioMed USA Inc. 27 New England Drive, Ramsey, NJ 07505. U.S.A. Tel: 973 278 5222 Fax: 201 934 6030 E mail: biomedusa@msn.com
## 3. Name of Device
| Trade name : | Model BT-220L and BT-2200 |
|------------------------|---------------------------|
| Common or usual name : | Ultrasonic Fetal Doppler |
| Regulation number : | 884.2660 |
| Regulation class : | II |
| Product code : | HGM |
| Classification panel : | Obstetrics / Gynecology |
## 4. Substantial Equivalence.
Bistos BT-220 Ultrasonic Fetal monitor is substantially equivalent in Intended use, Design, Function, Performance and all used material, direction to use, software, producing process, technology/principle of operation to already cleared BT-200T under 510(K)100885.
## 5. Indication for use.
The 220L/220C is a pocket sized ultrasonic fetal monitor that measures heart rate, which is displayed on an LCD display, and outputs fetal heart sounds through a built in speaker. the fetal heart rate is measured using Doppler Ultrasound.
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## 6. Device Description
Bistos' BT-220L, BT-220C is a pocket size Fetal Doppler that measures the fetal heart rate and out put the fetal sound through built-in speaker. By measuring fetal heart rate (FHR), they are able to predict fetal well-being. BT-220 irradiates ultrasound wave to the abdomen of a pregnant women to detect. The Doppler frequency signal and analyze, displays the heart rate in LCD screen. The device also provides the heart sound from the heart of fetus.
#### Operating mode
- Continuous Pulsed Doppler ●
- . Fetal Movement
Detail, Engineering design. Performing features, Operating mode, attached
## 7. Biocompatibility test.
All used material of patient contacted part was done Biocompatibility test by NAMSA ( North American Science ) by FDA guidance Blue Book Memo G95-1 use of ISO 10993 Biological Evaluation of Medical Device part 4, 5, 10.
Body contacting classification: Surface device, skin, limited less than 24 hrs. The Skin contacting materials were found to be biocompatible.
Attached the Biocompatibility Certificate. (F)
#### 8. Voluntary performed safety test result attached (B-E)
- * HR Accuracy Measuring Report (G)
- * Acoustic Output Test Report (F)
- * CB Test Certificate (B, E)
## 9.Conclusion
Bistos' BT-220L/C Pocket size Fetal monitor in this submission is substantially equivalent to the already cleared BT-200T under K100885 at design, specification, intended use, used material, direction to use, software, Technology/principal operating and Performing etc in every angles.
#### The difference between the devices does not raise any new issues in safety or effectiveness End of summary
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.