The RT600 is intended for general rehabilitation for: 1. Relaxation of muscle spasms 2. Prevention or retardation of disuse atrophy 3. Increasing local blood circulation 4. Maintaining or increasing range of motion The RT600 is intended for use with a surface electrical stimulation garment for population ages 12 and above. The RT600 is for prescription use only.
Device Story
RT600 is a Functional Electrical Stimulation (FES) upright elliptical ergometer; enables active (FES-evoked muscle contraction) and passive (motor-driven) lower extremity cycling. System components: motorized upright ergometer; FES controller with 6-channel stimulator; up to 5 wireless single-channel stimulators; cutaneous electrodes; Stimwear garment; pulse oximeter interface; remote database interface for therapy settings/logs. Operated by clinicians/technicians in clinical settings. Device uses powered hoist to position user in upright partial body-weight-supported position. Pulse oximeter provides real-time SpO2/pulse monitoring with alarms. Clinicians use stored therapy logs and session data to adjust rehabilitation protocols. Benefits include improved muscle function, circulation, and range of motion for patients with impaired lower extremity movement.
Clinical Evidence
Clinical validation performed on ten individuals with spinal cord injury (SCI) using the RT600 with five additional RT50 stimulation channels. Non-clinical testing included review of predicate documentation, output characteristic measurements, and system performance verification.
Indicated for general rehabilitation in patients ages 12 and older with impaired lower extremity movement, specifically for muscle spasm relaxation, prevention/retardation of disuse atrophy, increasing local blood circulation, and maintaining/increasing range of motion.
Regulatory Classification
Identification
An external functional neuromuscular stimulator is an electrical stimulator that uses external electrodes for stimulating muscles in the leg and ankle of partially paralyzed patients (e.g., after stroke) to provide flexion of the foot and thus improve the patient's gait.
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K103366
APR - 4 2011
## RT600 Summary of Safety and Effectiveness
(1) Submitter's name, address, telephone.number, a contact person, and the date the summary was prepared:
Andrew Barriskill Restorative Therapies Inc 907 South Lakewood Ave Baltimore, MD 21224
Phone: 800 609-9166
Prepared on March 28, 2011.
## (2) Name of the device, including the trade or proprietary name if applicable, the common or usual name, and the classification name:
Proprietary name: RT600 (FES upright ergometer) Powered Muscle Stimulator Common name: Classification name:External Functional Neuromuscular Stimulator
#### (3) Identification of the legally marketed device to which the submitter claims equivalence:
RESTORATIVE THERAPIES, INC. product: "RT300", K090750, a class 2 device
## (4) A description of the device that is the subject of the premarket notification submission.
The RT600 is a Functional Electrical Stimulation (FES) upright elliptical ergometer which is composed of:
- a motorized upright ergometer (RTI part number SA211257) ﮯ
- an FES controller with built in 6 channel stimulator (RTI part number വ SA109413)
- up to 5 additional wireless single channel stimulators (RTI part number က FA106897)
- a stimulation cable which connects the controller / stimulator to cutaneous ধ electrodes
- cutaneous electrodes (up to 22 electrodes for up to 11 stimulation channels) റ
- an interface to a remote database for the storage and retrieval of therapy റ settings and the storage of therapy session logs
- an interface to a pulse oximeter for the display and recording of pulse and 7 SpO2 levels and provision of alarming based on the data
- a stimwear garment incorporating electrodes for lower extremity cycling in ထ population ages 12 and above (RTI part number FA105486)
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This system allows a person with impaired lower extremity movement to undertake upright elliptical ergometry both actively (utilizing FES evoked lower extremity muscle contractions) and passively (utilizing power developed by the ergometer's motor).
(5) Statement of the intended use of the device:
The RT600 is intended for general rehabilitation for:
- 1. Relaxation of muscle spasms
- 2. Prevention or retardation of disuse atrophy
- 3. Increasing local blood circulation
- 4. Maintaining or increasing range of motion
The RT600 is intended for use with a surface electrical stimulation garment for population ages 12 and above.
The RT600 is for prescription use only.
(6) Technological Characteristics
The function of the RT600 is the same as the predicate devices however there are certain technological similarities and differences as described below:
| Technology | RT600 | RT300 predicate: K090750 |
|-------------------------------------------|---------------------------------------------------------------------------------------------------------------------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| Ergometer | Upright elliptical ergometer | Cycle ergometer |
| Power source<br>(energy used) | Mains power and<br>rechargeable battery for RT50<br>stimulators | Mains power and<br>rechargeable battery for RT50<br>stimulators |
| Controller | Based on Pocket PC running<br>custom software. | Based on Pocket PC running<br>custom software. |
| Stimulator<br>(energy<br>delivered) | Built in AC mains powered 0-<br>140mA 6 channel charge<br>balanced stimulator. | Built in AC mains powered 0-<br>140mA 6 channel charge<br>balanced stimulator. |
| Additional<br>stimulation<br>channels | Up to 5 additional wireless<br>battery powered stimulation<br>channels delivering 0-140mA<br>charge balanced stimulation. | Up to 5 additional wireless<br>battery powered stimulation<br>channels delivering 0-140mA<br>charge balanced stimulation. |
| | | |
| Stand alone<br>stimulation<br>mode | Wireless battery powered<br>stimulation channels may be<br>used in stand alone mode with<br>out the cycle ergometer. | Wireless battery powered<br>stimulation channels may be<br>used in stand alone mode with<br>out the cycle ergometer. |
| Stimwear<br>garment | Stimwear garment<br>incorporating electrodes<br>available for lower extremity<br>cycling, ages 12 and above. | Stimwear garment<br>incorporating electrodes<br>available for lower extremity<br>cycling, ages 12 and above. |
| Muscles<br>available for<br>stimulation | Quadriceps, hamstrings,<br>gluteals, gastroc, anterior<br>tibialis, abdominals, erector<br>spinae. | Quadriceps, hamstrings,<br>gluteals, gastroc, anterior<br>tibialis, shoulder, biceps,<br>triceps, anterior, posterior and<br>middle deltoid, wrist, grasp,<br>abdominals, erector spinae. |
| Flywheel | Uses leg motor to create<br>flywheel effect with reduced<br>weight and space. | Uses leg / arm crank motor to<br>create flywheel effect with<br>reduced weight and space. |
| Hoist | Utilizes powered hoist to<br>position user in upright partial<br>body weight supported<br>position. | Allows user to remain in their<br>own seating, e.g wheelchair<br>eliminating the need for<br>transfer. |
| Passive<br>cycling | Utilizes motor to provide<br>assistance during passive<br>cycling. | Utilizes motor to provide<br>assistance during passive<br>cycling. |
| Database<br>interface | Utilizes database interface for<br>storage and retrieval of patient<br>therapy settings and storage of<br>session logs. | Utilizes database interface for<br>storage and retrieval of patient<br>therapy settings and storage of<br>session logs. |
| Motorized arm<br>crank | No arm crank is provided. | Allows active / passive arm<br>cycling with FES |
| Pulse<br>oximeter<br>interface | Utilizes pulse and SpO2 data for<br>display, recording and alarming | Utilizes pulse and SpO2 data<br>for display, recording and<br>alarming |
| Bilateral or<br>Unilateral<br>stimulation | Uses bilateral or unilateral<br>stimulation. | Uses bilateral or unilateral<br>stimulation. |
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Table 1 Device technology comparison
(b) Performance data
Non clinical testing to determine equivalence has been primarily composed of the following tests:
{3}------------------------------------------------
| Test or procedure | Description |
|------------------------------------------------------|--------------------------------------------------------------------------------------------------|
| Review of user documentation for<br>predicate device | Ensure that equivalent functionality is<br>specified and implemented in the new<br>device. |
| Review of 510(k) submission for<br>predicate device | Confirm technical specifications for<br>completion of predicate details in<br>comparison tables |
| Output characteristic measurement of<br>new device | Confirm technical specifications for<br>completion of new device details in<br>comparison tables |
| Conduct of system testing | Conduct system testing to verify<br>performance to specification. |
| Clinical Test | Description |
|----------------------------------------------------|-----------------------------------------------------------------------------------------------------|
| Testing the RT600 upright elliptical<br>ergometer. | The RT600 with 5 additional RT50<br>stimulation channels was validated with<br>ten SCI individuals. |
## RTI concludes that:
The RT600 has the same intended use as the RT300 predicate device.
The RT600 has the same output characteristics as the predicate device. The RT600 utilizes the same control system as the predicate device including controller, motor controller and drive assembly. The different technological characteristics do not raise new questions of safety and effectiveness.
In conclusion, RTI's clinical and non-clinical testing has demonstrated that the RT600 is as safe and effective as the predicate devices.
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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 lines forming its body and wings. The eagle is facing right. The text "DEPARTMENT OF HEALTH & HUMAN SERVICES - USA" is arranged in a circular fashion around the eagle.
Food and Drug Administration 10903 New Hampshire Avenue Document Control Room -WO66-G609 Silver Spring, MD 20993-0002
Restorative Therapies Inc % Mr. Andrew Barriskill 907 S. Lakewood St Baltimore, MD 21224
APR - 4 2011
Re: K103366
Trade Name: RT600 (FES upright ergometer) Regulation Number: 21 CFR 882.5810 Regulation Name: External functional neuromuscular stimulator Regulatory Class: Class II Product Code: GZI Dated: March 3, 2011 Received: March 4, 2011
Dear Mr. Barriskill:
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 devicerelated adverse events) (21 CFR 803); good manufacturing practice requirements as set forth in
{5}------------------------------------------------
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 go to http://www.fda.gov/AboutFDA/CentersOffices/CDRH/CDRHOffices/ucm115809.htm for the Center for Devices and Radiological Health's (CDRH's) Office of Compliance. 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 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 Small Manufacturers, International and Consumer Assistance at its toll-free number (800) 638-2041 or (301) 796-7100 or at its Internet address http://www.fda.gov/MedicalDevices/Resourcesfor You/Industry/default.htm.
Sincerely yours,
Zelezn
Melvin R. Baldwin, MD
Malvina B. Eydelman, M.D. Director Division of Ophthalmic, Neurological, and Ear, Nose and Throat Devices Office of Device Evaluation Center for Devices and Radiological Health
Enclosure
{6}------------------------------------------------
# Indications for Use
510(k) Number: K103366
RT600 functional electrical stimulation stepper ergometer Device Name:
Indications for use:
The RT600 is intended for general rehabilitation for:
- 1. Relaxation of muscle spasms
- 2. Prevention or retardation of disuse atrophy
- 3. Increasing local blood circulation
- 4. Maintaining or increasing range of motion
The RT600 is intended for use with a surface electrical stimulation garment for population ages 12 and above.
Prescription Use X (Part 21 CFR 801 Subpart D)
Concurrence of CDRH, Office of Device Evaluation (ODE)
(Division Sign-Off) Division of Ophthalmic, Neurological and Ear, Nose and Throat Devices
510(k) Number K103366
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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.
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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.