The RTX3371 is for use in non-clinical settings (such as the home), as an accessory device that is intended to be a communication tool to enable health care providers to receive historical patient information. It is intended to be used in combination with a variety of external devices. The RTX3371 serves as the remote communication link between compatible external devices, and the compatible healthcare facility at another location. The healthcare facility could be at a disease management centre or with the healthcare/wellness provider or other out of hospital caregivers. The purpose is to collect and transmit selected medical information (such as weight, blood pressure, blood glucose) using standard wireless technologies. The RTX3371 does not measure, interpret or make any decisions on the vital data that it conveys.
Device Story
RTX3371 is a telemedicine hub/gateway device for home use; collects physiological data (weight, blood pressure, blood glucose) from external patient monitors via wireless or cable connections; transmits data to remote healthcare servers using GSM/GPRS wireless technology. Device features a color display and push buttons for patient interaction; allows patients to respond to provider-sent questions regarding vital signs, symptoms, and behaviors. Operated by patients in home settings; healthcare providers access transmitted data at remote facilities. Device does not interpret data or provide clinical decisions; serves strictly as a communication link. Benefits include facilitating remote monitoring of historical patient information by out-of-hospital caregivers.
Clinical Evidence
Bench testing only. No clinical investigation performed. Verification and validation activities conducted per design control processes, including FMEA risk management (ISO 14971:2000) and testing against IEC 60601-1, IEC 60601-1-2, EN980, and FCC Part 15+24 standards.
Technological Characteristics
Telemedicine hub/gateway; GSM/GPRS module for wireless data transmission; color display with push-button interface; supports wireless and cable connectivity to external patient monitors. Complies with IEC 60601-1, IEC 60601-1-2, EN980, and FCC standards. Risk management per ISO 14971:2000.
Indications for Use
Indicated for use in non-clinical settings (home) by patients and healthcare providers to collect and transmit historical physiological data (e.g., weight, blood pressure, blood glucose) from compatible external monitors to a remote healthcare facility. Not for emergency calls, real-time alarms, time-critical data, or as a substitute for direct medical supervision.
Regulatory Classification
Identification
A radiofrequency physiological signal transmitter and receiver is a device used to condition a physiological signal so that it can be transmitted via radiofrequency from one location to another, e.g., a central monitoring station. The received signal is reconditioned by the device into its original format so that it can be displayed.
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Image /page/0/Picture/1 description: The image shows the word "Tunstall" in a bold, sans-serif font. The word is white and is set against a black background. The background has a textured appearance, with small black dots creating a grainy effect. The overall design is simple and eye-catching.
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## 510(k) Summary
This summary of 510(k) safety and effectiveness information is submitted in accordance with the requirement of 21 CFR 807.92
| Submitter: | Bjarne Flou |
|------------|----------------------------------|
| | Managing Director |
| | Tunstall Healthcare |
| | Stroemmen 6 |
| | DK-9400 Noerresundby |
| | Denmark |
| | Tel: +45 72 100 163 |
| | Fax: +45 72 100 164 |
| | Email: bf@tunstallhealthcare.com |
APR 1 5 2009
Contact person: Niels Ole Andersen Director of Operations Email: noa@tunstallhealthcare.com
February 6, 2009 Date of summary:
Common Name: Physiological Transmitter and Receiver Trade name: RTX3371
Classification name:21 CFR 870.2910 Physiological Signal Transmitter and Receiver. Product code: DRG
#### Predicate Devices:
The RTX3371 device is substantially equivalent to the following predicate devices: 510(k) number: K071953 Device name: RTX3370 Applicant: Tunstall Healthcare
510(k) number: K072698 Device name: Confidant 2.5 Applicant: Confidant International, LLC
#### Submission Device Description:
The RTX3371 device performs transmission of physiological patient information to and from wireless, infrared and cabled patient monitors, and a remote data server healthcare facility using standard digital communication technologies and protocols.
The RTX3371, with its build-in GSM/GPRS module, transmits data using public wireless networks.
The RTX3371 screen, displays the information or questions about vital signs, symptoms and behaviors sent by the patient's healthcare provider, and allows the patient to respond via four large buttons
The RTX3371 device is not used directly on a patient, and poses no significant risk to the patient or other people within the patient's home.
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## Intended use and indications for use:
The RTX3371 is for use in non-clinical settings (such as the home), as an accessory device that is intended to be a communication tool to enable health care providers to receive historical patient information. It is intended to be used in combination with a variety of external devices. The RTX3371 serves as the remote communication link between compatible external devices, and the compatible healthcare facility at another location. The healthcare facility could be at a disease management centre or with the healthcare/wellness provider or other out of hospital caregivers. The purpose is to collect and transmit selected medical information (such as weight, blood pressure, blood glucose) using standard wireless technologies.
The RTX3371 does not measure, interpret or make any decisions on the vital data that it conveys.
| Item | | Submission device | Predicate device<br>K071953<br>(Own product) | Predicate device<br>K072698 |
|------|----------------------------------------------|-------------------------------------------------------------------------------------------------------------------------------------------------------|-------------------------------------------------------------------------|--------------------------------------------------------------------------------------------------------------|
| 1 | Intended use /<br>Indication for<br>use | See section 2. | See section 9.1.<br>Same, except way<br>of communication<br>with server | See section 9.2. |
| 2 | Intended users | Home users and<br>healthcare providers. | Same | Same |
| 3 | Site of use | Typically for use in<br>patient's home | Same | Same |
| 4 | System<br>description | Telemedicine device that<br>is working as hub/gateway<br>sending measured data<br>from compatible patient<br>monitors to a compatible<br>data server. | Same | Same |
| 5 | Appearance | Special designed unit with<br>relatively small display and<br>push buttons for<br>interaction. | Same | Standard Mobile Phone<br>platform with a<br>relatively small display<br>and push buttons for<br>interaction. |
| 6 | Connection to<br>patient<br>monitors | Wireless and cable<br>connection between the<br>patient monitors and the<br>device. | Same | Only Wireless<br>connection between the<br>patient monitors and<br>the device. |
| 7 | Transmission<br>from device to<br>the server | Standard wireless<br>technologies | Residential<br>telephone line | Standard wireless<br>technologies |
| 8 | Patient<br>Interactions | Colour display and push<br>buttons for collection of<br>patient typed data. | Same | Same, but different size<br>of display and buttons. |
| 9 | Measurements | Blood pressure, weight, | Same | Same |
other measurements provided from compatible
monitor devices.
#### Substantial Equivalence Comparison table:
Tunstall Healthcare
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| 10a | Contra<br>indications and<br>warnings | The device is not for<br>emergency calls, and may<br>not be used to send any<br>real-time alarms or time-<br>critical data. | Same | The device is not<br>intended for emergency<br>calls or for transmission<br>or indication of any<br>real-time alarms or<br>time-critical data. |
|-----|---------------------------------------|---------------------------------------------------------------------------------------------------------------------------------------------------------------|------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| 10b | Contra<br>indications and<br>warnings | All patient medical<br>diagnosis and treatment<br>are to be performed under<br>the supervision and<br>oversight of an appropriate<br>healthcare professional. | Same | All patient medical<br>diagnoses and<br>treatment are to be<br>performed under the<br>supervision and<br>oversight of an<br>appropriate healthcare<br>professional. |
| 10c | Contra<br>indications and<br>warnings | The device is not for use in<br>systems which substitute<br>for medical care. | Same | The device is not<br>intended to provide<br>automated treatment<br>decisions, or to be used<br>as a substitute for<br>professional healthcare<br>judgment |
| 10d | Contra<br>indications and<br>warnings | The device is not for use in<br>systems set up for patients<br>who need direct medical<br>supervision or who might<br>need emergency<br>intervention. | Same | The device is not<br>intended as a substitute<br>for direct medical<br>supervision or<br>emergency<br>intervention. |
#### Discussion of similarities and differences:
Item 1: The submission device and the predicate device K071953 have exactly the same intended use except the way of communication with the server. The products are identical seen from the user, with same functionalities and visual design except the color of the front cover. The way of communication is "Normal residential telephone line" for the predicate device K071953 but "standard wireless technologies" for the submission device and the predicate device K072698. The way of communication is discussed under Item 7. The overall intended use for the submission device and both predicate devices are the same. The minor differences are discussed in the items below.
Item 2: The submission device and the two predicate devices are all intended to be used by the same group of patients and health care providers.
Item 3: The submission device and the two predicate devices are all intended to be used by patients in their homes.
Item 4: The submission device and the two predicate devices are all collecting data from standard home monitoring devices and transmit the measurements to a database server.
Item 5: The submission device and the predicate device K071953 have identical appearance. The predicate device K072698 is a standard Mobile Phone platform, but seen from the user an almost identical appearance using a small display and a few buttons,
Tunstall Healthcare
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Item 6: The submission device and the predicate device K071953 use exactly the same way of communication technologies with the patient monitors. The predicate device K072698 does not support cable connections to patient monitors, but this does not change the intended use. It only limits the number of supported patient monitors.
Item 7: The predicate device K071953 use a standard residential telephone line as communication between the device and the database server, but both the submission device and the predicate device K072698 use standard wireless technologies. The submission device is based on GSM/GPRS wireless technology like the predicate device K072698.
Item 8: The submission device and the two predicate devices are all based on patient interactions using a relatively small color display and a few push buttons. The submission device and the predicate device K071953 are identical seen from user, and designed to be more user friendly than the predicate device K072698.
Item 9: The submission device and the two predicate devices are all interfacing the same type of home monitoring devices to collect measurements like blood pressure. blood glucose, weight etc.
Item 10: The contra indications and warnings are the same for the submission device and the predicate devices.
#### Performance data:
The RTX3371 device has been tested to meet the requirements of the following standards and requlations used as acceptance criteria:
IEC 60601-1. IEC 60601-1-2. EN980 and FCC part 15+24.
Risk management is performed according to ISO14971:2000 using FMEA.
Based on the fact that the performance comparison of the predicate devices and the submission device show that the differences are minor and causes no harm to the user, and the fact that the intended use and indication are similar, it was early in the project decided to focus on verification and internal validation instead of large scale validation in form of clinical investigation.
Verification and validation testing activities are successfully conducted according to the company's design control processes to establish performance and reliability characteristics of the device.
#### Conclusion
The RTX3371 is substantially equivalent to the predicate devices cleared by FDA. Verification and validation activities demonstrate that safety and effectiveness are acceptable and comparable to the performance of the predicate devices, justifying 510(k) clearance of the device RTX3371.
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Image /page/4/Picture/1 description: The image shows the logo for the U.S. Department of Health & Human Services. The logo consists of a stylized eagle with three stripes forming its wing and body. The text "DEPARTMENT OF HEALTH & HUMAN SERVICES . USA" is arranged in a circular fashion around the eagle.
#### Public Health Service
Food and Drug Administration 9200 Corporate Boulevard Rockville MD 20850
## APR 1 5 2009
Tunstall Healthcare c/o Mr. Niel Ole Anderson Director of Operations Stroemmen 6 DK-9400 Noerresundby Denmark
Re: K090886
Trade/Device Name: RTX3371 Regulation Number: 21 CFR 870.2910 Regulation Name: Radiofrequency Physiological signal Transmitter and Receiver Regulatory Class: Class II (two) Product Code: DRG Dated: March 25, 2009 Received: March 31, 2009
Dear Mr. Anderson:
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 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-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.
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Page 2 - Mr. Niel Ole Anderson
If you desire specific advice for your device on our labeling regulation (21 CFR Part 801), please contact the Center for Devices and Radiological Health's (CDRH's) Office of Compliance at (240) 276-0120. Also, please note the regulation entitled, "Misbranding by reference to premarket notification" (21CFR Part 807.97). For questions regarding the reporting of adverse events under the MDR regulation (21 CFR Part 803), please contact the CDRH/Office of Surveillance and Biometrics/Division of Postmarket Surveillance at 240-276-3464. For more information regarding the reporting of adverse events, please go to http://www.fda.gov/cdrh/mdr/.
You may obtain other general information on your responsibilities under the Act from the Division of Small Manufacturers, International and Consumer Assistance at its toll-free number (800) 638-2041 or (240) 276-3150 or at its Internet address http://www.fda.gov/cdrh/industry/support/index.html.
Sincerely yours,/
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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K090886
#### 2. Indications for use statement
# Indication for Use Statement
510(k) Number (if known):
#### Device name: RTX3371
The RTX3371 is for use in non-clinical settings (such as the home), as an accessory device that is intended to be a communication tool to enable health care providers to receive historical patient information. It is intended to be used in combination with a variety of external devices. The RTX3371 serves as the remote communication link between compatible external devices, and the compatible healthcare facility at another location. The healthcare facility could be at a disease management centre or with the healthcare/wellness provider or other out of hospital caregivers. The purpose is to collect and transmit selected medical information (such as weight, blood pressure, blood glucose) using standard wireless technologies.
The RTX3371 does not measure, interpret or make any decisions on the vital data that it conveys.
Prescription Use X (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)
Nathalie Zuckerman
4/14/09 (Division Slan-Off) Division of Cardiovascular Devices 510(k) Number 12090886
Page 1 of
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Learn the FDA Browser
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.