The Revlon RVSP3501 Spa MoistureStay Paraffin Bath is: . Useful in symptomatic relief of pain caused by arthritis, bursitis, and chronic joint inflammation. . Relaxes muscles, relieves stiffness and muscle spasm . Stimulates circulation and for other conditions where heat is indicated.
Device Story
The Revlon RVSP3501 is an 80-watt paraffin bath unit designed for home use. It functions by heating paraffin wax to provide therapeutic heat to the hands or feet. The device includes a thermostat with 'High' and 'Keep Warm' settings, and two LED indicators (red for heater, green for power). The kit includes 3lbs of paraffin wax, a plastic mat, glove liners, and mitts. The user dips their hands or feet into the melted wax to apply heat, which helps relieve pain, stiffness, and muscle spasms, and stimulates circulation. It is an over-the-counter device operated by the patient.
Clinical Evidence
Bench testing only. The device was tested for compliance with UL1431 and CAN/CSA C22.2 No. 64-M91 standards. Performance testing compared the subject device to the predicate (K022626), noting differences in wax melting time due to power consumption variations.
Technological Characteristics
80-watt paraffin bath unit; thermostat-controlled heating (High/Keep Warm settings); LED status indicators (power/heater); includes paraffin wax, plastic mat, glove liners, and mitts. Complies with UL1431 (2nd Ed) and CAN/CSA C22.2 No. 64-M91. Standalone device.
Indications for Use
Indicated for symptomatic relief of pain from arthritis, bursitis, and chronic joint inflammation; muscle relaxation; relief of stiffness and muscle spasm; stimulation of circulation; and other conditions where heat therapy is indicated.
Regulatory Classification
Identification
A paraffin bath is a device intended for medical purposes that consists of a tub to be filled with liquid paraffin (wax) and maintained at an elevated temperature in which the patient's appendages (e.g., hands or fingers) are placed to relieve pain and stiffness.
Special Controls
*Classification.* Class II (special controls). The device is exempt from the premarket notification procedures in subpart E of part 807 of this chapter subject to the limitations in § 890.9.
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510(k) Summary (per 21 CFR 807.92(c))
## 1. Applicant
Shenzhen Comfort Technology Co. Ltd. No. 3 Building North Nanling Road Xiner Industrial Zone Shenzhen, China
NOV 2 4 2009
Mr. Jack Zhou, General Manager Tel: 86 755 2741 5168 Fax: 86 755 2741 5579 E-mail: jack@easepal.com.cn
Date Prepared: August 5, 2009
- 2. Device Name
| Device Name: | Revlon RVSP3501 (Type SPB3752EA) Spa MoistureStay Paraffin Bath |
|-------------------------|-----------------------------------------------------------------|
| Regulation Description: | Paraffin bath |
| Regulation Number: | 890.5110 |
| Product Code: | IMC |
| Device Class: | II |
| Review Panel: | Physical Medicine |
## 3. Predicate Devices
The Revlon RVSP3501 (Type SPB3752EA) Spa MoistureStay Paraffin Bath is substantially equivalent to the following device:
| 510(k) Number | Device | Applicant |
|---------------|------------------------------------------------------|--------------------------|
| K022626 | Revlon RVS1212 (MoistureStay) Luxury<br>Paraffin Spa | Raymond Industrial, Ltd. |
# 4. Indications for Use
The Revlon RVSP3501 Spa MoistureStay Paraffin Bath is:
- . Useful in symptomatic relief of pain caused by arthritis, bursitis, and chronic joint inflammation.
- . Relaxes muscles, relieves stiffness and muscle spasm
- . Stimulates circulation and for other conditions where heat is indicated.
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### 5. Description of the Device
The Revlon RVSP3501 (Type SPB3752EA) Spa MoistureStay Paraffin Bath is an 80 Watt paraffin bath unit, with a thermostat that varies the heat from High to Keep Warm. There are two LEDs, a red LED for the heater, and a green LED to indicate the power. The unit is provided with 3lbs of paraffin wax, a plastic mat when dipping the hands or feet, glove liners, and a pair of mitts.
#### 6. Summary of the Technical Characteristics
- . Safety Testing
The Revlon RVSP3501 Spa MoistureStay Paraffin Bath was evaluated and found to comply with the applicable requirements of the following standards:
- UL1431 Standard for Personal Hygiene and Health Care Appliances, 2nd Edition, 0 November 22, 1996, revised March 26, 2007
- o Canadian Standard for Household Cooking and Liquid-Heating Appliances, CAN/CSA C22.2 No. 64-M91 (R2003)
- . Performance Testing
The Revlon RVSP3501 Spa MoistureStay Paraffin Bath - Type SPB3752EA was tested alongside the Revlon Model RVS1212 Luxury Paraffin Spa (K022626). The major difference between the two units was the time required to melt the wax, as was expected, because of the significant difference in power consumption
#### 7. Safety and Effectiveness
The Revlon RVSP3501 Spa MoistureStay Paraffin Bath has been shown to be as safe and as effective as the predicate device listed in this 510(k) submission; that is, both the Revlon RVSP3501 Spa MoistureStay Paraffin Bath and the Revion RVS1212 (MoistureStay) Luxury Paraffin Spa have the same indications for use and are similar in both design and function. Any differences in technological characteristics between the Revlon RVSP3501 Spa MoistureStay Paraffin Bath and the predicate device do not raise issues of safety and effectiveness.
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Image /page/2/Picture/1 description: The image is a circular seal or logo. The text "DEPARTMENT OF HEALTH & HUMAN SERVICES - USA" is arranged around the top half of the circle. In the center of the circle is a stylized image of an eagle or bird with outstretched wings. The bird's body is formed by three curved lines, giving it a modern and abstract appearance.
#### Public Health Service
Food and Drug Administration 10903 New Hampshire Avenue Document Control Room W-O66-0609 Silver Spring, MD 20993-0002
NOV 2 4 2009
Shenzhen Comfort Technology Co., Ltd. % Intertek Testing Services NA, Inc. Mr. Daniel W. Lehtonen 2307 East Aurora Road, Unit B7 Twinsburg, Ohio 44087
Re: K093100
Trade/Device Name: Revlon RVSP3501 (Type SPB3752EA) Spa MoistureStay Paraffin Bath
Regulation Number: 21 CFR 890.5110 Regulation Name: Paraffin bath. Regulatory Class: Class II Product Code: IMC Dated: November 9, 2009 Received: November 10, 2009
Dear Mr. Lehtonen:
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.
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.
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Page 2- Mr. Daniel W. Lehtonen
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.
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,
Mark A. Millerson
Mark N. Melkerson Director Division of Surgical, Orthopedic, and Restorative Devices Office of Device Evaluation Center for Devices and Radiological Health
Enclosure
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# Indications for Use
510(k) Number (if known): _
Device Name: Revion RVSP3501 (Type SPB3752EA) Spa MoistureStay Paraffin Bath
Indications for Use:
The Revlon RVSP3501 (Type SPB3752EA) Spa MoistureStay Paraffin Bath is:
- Useful in symptomatic relief of pain caused by arthritis, and chronic joint inflammation. .
- Relaxes muscles, relieves stiffness and muscle spasm .
- Stimulates circulation and for other conditions where heat is indicated.
Prescription Use (Part 21 CFR 801 Subpart D)
AND/OR
Over-The-Counter Use (21 CFR 801 Subpart C)
bpart C)
X
(PLEASE DO NOT WRITE BELOW THIS LINE-CONTINUE ON ANOTHER PAGE OF NEEDED)
Concurrence of CDRH, Office of Device Evaluation (ODE)
FOR M. MELKERSON
(Division Sign-Off) Division of Surgical, Orthopedic, and Restorative Devices
510(k) Number K093100
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.