K212935 · Xiamen Simo Electronic Co., Ltd. · IRP · Feb 19, 2022 · Physical Medicine
Device Facts
Record ID
K212935
Device Name
Air Pressure Foot Massager
Applicant
Xiamen Simo Electronic Co., Ltd.
Product Code
IRP · Physical Medicine
Decision Date
Feb 19, 2022
Decision
SESE
Submission Type
Traditional
Regulation
21 CFR 890.5650
Device Class
Class 2
Attributes
Therapeutic
Indications for Use
Air Pressure Foot Massager is intended to temporarily relieve minor muscle aches and/or pains, and to temporarily increase circulation to the treated areas.
Device Story
Air Pressure Foot Massager (SM-512F) is a portable, rechargeable, over-the-counter inflatable tube massage system. Device consists of a pump, hand controller, and inflatable sleeves with 2 compression chambers. Pump inflates/deflates chambers sequentially to simulate tissue kneading. User operates device via hand controller to power on and adjust pressure intensity (30-110mmHg). Powered by internal lithium-ion battery or external power supply. Used in home healthcare environments. Output is mechanical compression of the foot/leg area. Intended to temporarily relieve minor muscle aches/pains and increase local circulation. Benefits include portable, user-controlled muscle relief and circulation support.
Clinical Evidence
No clinical data. Bench testing only. Compliance verified with AAMI ES60601-1, IEC 60601-1-11, IEC 60601-1-2, ISO 10993-5 (cytotoxicity), ISO 10993-10 (irritation/sensitization), and IEC 62133-2 (battery safety).
Indicated for individuals seeking temporary relief of minor muscle aches and/or pains and temporary increase in circulation to treated areas.
Regulatory Classification
Identification
A powered inflatable tube massager is a powered device intended for medical purposes, such as to relieve minor muscle aches and pains and to increase circulation. It simulates kneading and stroking of tissues with the hands by use of an inflatable pressure cuff.
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February 19, 2022
Xiamen Simo Electronic Co., Ltd % Ray Wang Official Correspondent Beijing Believe-Med Technology Service Co., Ltd. Rm. 912, Building #15, XiYueHui, No.5, YiHe North RD. FangShan District Beijing, Beijing 102401 China
Re: K212935
Trade/Device Name: Air Pressure Foot Massager Regulation Number: 21 CFR 890.5650 Regulation Name: Powered Inflatable Tube Massager Regulatory Class: Class II Product Code: IRP Dated: December 24, 2021 Received: December 27, 2021
Dear Ray Wang:
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. Although this letter refers to your product as a device, please be aware that some cleared products may instead be combination products. The 510(k) Premarket Notification Database located at https://www.accessdata.fda.gov/scripts/cdrh/cfdocs/cfpmn/pmn.cfm identifies combination product submissions. 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.
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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 of medical device-related adverse events) (21 CFR 803) for devices or postmarketing safety reporting (21 CFR 4, Subpart B) for combination products (see https://www.fda.gov/combination-products/guidance-regulatory-information/postmarketing-safety-reportingcombination-products); good manufacturing practice requirements as set forth in the quality systems (QS) regulation (21 CFR Part 820) for devices or current good manufacturing practices (21 CFR 4, Subpart A) for combination products; and, if applicable, the electronic product radiation control provisions (Sections 531-542 of the Act); 21 CFR 1000-1050.
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 https://www.fda.gov/medical-device-safety/medical-device-reportingmdr-how-report-medical-device-problems.
For comprehensive regulatory information about medical devices and radiation-emitting products, including information about labeling regulations, please see Device Advice (https://www.fda.gov/medicaldevices/device-advice-comprehensive-regulatory-assistance) and CDRH Learn (https://www.fda.gov/training-and-continuing-education/cdrh-learn). Additionally, you may contact the Division of Industry and Consumer Education (DICE) to ask a question about a specific regulatory topic. See the DICE website (https://www.fda.gov/medical-device-advice-comprehensive-regulatoryassistance/contact-us-division-industry-and-consumer-education-dice) for more information or contact DICE by email (DICE@fda.hhs.gov) or phone (1-800-638-2041 or 301-796-7100).
Sincerely.
Heather Dean, PhD Assistant Director, Acute Injury Devices Team DHT5B: Division of Neuromodulation and Physical Medicine Devices OHT5: Office of Neurological and Physical Medicine Devices Office of Product Evaluation and Quality Center for Devices and Radiological Health
Enclosure
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# Indications for Use
510(k) Number (if known) K212935
Device Name Air Pressure Foot Massager
Indications for Use (Describe)
Air Pressure Foot Massager is intended to temporarily relieve minor muscle aches and/or pains, and to temporarily increase circulation to the treated areas.
| Type of Use ( <i>Select <b>one</b> or <b>both</b>, as applicable</i> ) |
|------------------------------------------------------------------------|
|------------------------------------------------------------------------|
Prescription Use (Part 21 CFR 801 Subpart D)
X Over-The-Counter Use (21 CFR 801 Subpart C)
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#### 510(k) Summary
The assigned 510(k) Number: K212935
- 1. Date of Preparation
02/05/2022
- Sponsor 2.
## XIAMEN SIMO ELECTRONIC CO., LTD
Floor 3rd-5th, No.173 Siming Park, Tong'an Industrial Zone, Tong'an District, Xiamen City, Fujian Province, China, 361100 Contact Person: Wang Qinsheng Position: General Manager Tel: +86-13860109615 Fax: +86-592-5917070 Email: jeson@xmsimo.com
- 3. Submission Correspondent
Contact Person:
Mr. Ray Wang Tel: +86-18910677558 Fax: +86-10-52214696 Email: information(@believe-med.com
#### Beijing Believe-Med Technology Service Co., Ltd.
Rm.912, Building #15, XiYueHui, No.5, YiHe North Rd., FangShan District, Beijing, China,102401
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#### 4. Identification of Proposed Device
Trade Name: Air Pressure Foot Massager Common Name: Physical Medicine Model(s): SM-512F
Regulatory Information: Classification Name: Massager, Powered Inflatable Tube Classification: II; Product Code: IRP; Regulation Number: 21 CFR 890.5650; Review Panel: Physical Medicine.
Indication for Use:
Air Pressure Foot Massager is intended to temporarily relieve minor muscle aches and/or pains, and to temporarily increase circulation to the treated areas.
- 5. Device Description
Air Pressure Foot Massager has a pump. The pump is connected with the dedicated inflatable sleeve through the hose, one sleeve has 2 compression chambers. The pump compresses and inflates air into the chambers continuously to produce compression from the body tail end to body center and release the air after compression as one cycle process.
The device is equipped with a hand controller. In operation, the user simply turns the power on via the power button. The intensity (pressure) can be adjusted by purpose to avoid any discomfort. The device is powered by an external IEC 60601-1 compliant power supply and can also be powered by an internal IEC 62133-compliant lithium-ion battery. The materials of sleeve use medical fabric or equivalent medical material for increased patient comfort and biocompatibility compliance.
The Air Pressure Foot Massager is a portable and rechargeable device. It is intended to be an over-the-counter portable inflatable tube massage system which simulates kneading of tissue by use of an inflatable sleeve. It can be used to temporarily increase blood circulation and temporarily relieve minor muscle aches and pains.
- Identification of Predicate Device 6.
Predicate Device 510(k) Number: K201935 Product Name: Air Pressure Therapy System Manufacturer: Xiamen Weiyou Intelligent Technology Co., Ltd.
- 7. Non-Clinical Test Conclusion
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Non clinical tests were conducted to verify that the proposed device met all design specifications as was Substantially Equivalent (SE) to the predicate device. The test results demonstrated that the proposed device complies with the following standards:
- > AAMI ES60601-1:2005+A1:2012, Medical Electrical Equipment - Part 1: General Requirements for Safety And Essential Performance (IEC 60601-1);
- > IEC 60601-1-11: 2015, Medical electrical equipment - Part 1-11: General Requirements for Basic Safety and Essential Performance - Collateral Standard: Requirements for medical electrical equipment and medical electrical systems used in the home healthcare environment;
- IEC 60601-1-2:2014, Medical electrical equipment- Part 1-2: General requirements for basic A safety and essential performance- Collateral standard: Electromagnetic compatibility-Requirements and tests.
- > ISO 10993-5:2009, Biological Evaluation of Medical Device, Part 5-Tests for Vitro cytotoxicity
- > ISO 10993-10:2010, Biological evaluation of medical devices - Part 10: Tests for irritation and skin sensitization;
- > IEC 62133-2:2017, Secondary cells and batteries containing alkaline or other non-acid electrolytes - Safety requirements for portable sealed secondary cells, and for batteries made from them, for use in portable applications - Part 2: Lithium systems.
- Clinical Test Conclusion 8.
No clinical study is included in this submission.
- Substantially Equivalent (SE) Comparison 9.
#### Table 1 General Comparison
| ITEM | Proposed Device | Predicate Device (K201935) | Remark |
|------------------------------------------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|------------|
| Product Code | IRP | IRP | SAME |
| Regulation No. | 21 CFR 890.5650 | 21 CFR 890.5650 | SAME |
| Class | II | II | SAME |
| Indication For Use | Air Pressure Foot Massager is intended to<br>temporarily relieve minor muscle aches<br>and/or pains, and to temporarily increase<br>circulation to the treated areas. | Air Pressure Therapy System VU-IPC04B<br>is intended to temporarily relieve minor<br>muscle aches and/or pains, and to<br>temporarily increase circulation to the<br>treated areas. | SAME |
| Rx or OTC | OTC | OTC | SAME |
| Technology | Compressor and valve system which<br>sequentially inflates inflatable chambers. | Compressor and valve system which<br>sequentially inflates inflatable chambers. | SAME |
| ITEM | Proposed Device | Predicate Device (K201935) | Remark |
| Pressure range | 30-110mmHg | 30-110mmHg | SAME |
| Treatment time | 0-30min, default as 15min | 5-99mins | Analysis 1 |
| Mode of compression | Sequential | Sequential | SAME |
| Power source | Voltage: DC5V 1A | AC 110-240V; 50Hz/60Hz | Analysis 2 |
| | Lithium Battery: 3.7V, 2400mah (Battery<br>meet IEC 62133-2) | Battery meet IEC 62133-2 | |
| Power consumption | 5W | 35W | Analysis 2 |
| Number of chambers | 4pcs/Pair | 6 | Analysis 3 |
| Size of the sleeves | 340*365*360mm | M: 91x65cm, XL: 110x70cm(overlapping)<br>XXL: 125x76cm(overlapping) | Analysis 4 |
| Dimension | 211*55*50mm | 220*140*90mm | Analysis 4 |
| Weight | $1.15\pm0.1$ kg | 1.6Kg | Analysis 4 |
| Work mode | Mode 1 | Mode A: | Analysis 5 |
| | The model is divided into two processes, | In this mode, only a single chamber is inflated at a | |
| | the first process includes inflating,<br>deflating and holding pressure. The | time. Starting from the chamber (1) and working up to<br>the chamber (6). Then the cycle repeats. | |
| | inflating sequence of air chambers of<br>sleeves is: | Mode B: | |
| | The chamber No.(1) Inflate and keep<br>pressure three times, deflated, Then the | In this mode, the chamber (1) stays inflated. It<br>gradually adds a chamber until all six chambers are<br>filled with air. Then the cycle repeats. | |
| | chamber No (2) inflate and keep<br>pressure three times, deflated. | Mode C: | |
| | In the second process, the air pump is<br>always opened, and the air is inflated | In this mode, chamber (1) inflates & deflates 4 times,<br>then holds pressure; next chamber (2) inflates &<br>deflates 4 times, chamber (1)(2) hold pressure; | |
| | and deflated according to the following<br>inflating sequence: | chamber (3) inflates & deflates 4 times, chamber (2)(3)<br>hold pressure, chamber (1) deflates; chamber (4) | |
| | (1)(2)-(1)-(2)-(1)(2)-(1)-(2)<br>-(1)(2)-(1)-(2)-(1)(2)-(1)-(2)-(2)-(1) | inflates & deflates 4 times, chamber (3)(4) hold<br>pressure, chamber (2) deflates; working as this way up<br>to chamber (6). Then the cycle repeats. | |
| | The inflating time is different according<br>to the intensity selected. | Note: Under this mode, for the FIRST CYCLE, it<br>works as mode B to warm up; from the 2nd cycle on,<br>it works as PULSE Mode C. | |
| | Mode 2 | Mode D: | |
| | In this model, at first ,the chamber No.<br>(1) inflate and keep pressure four times, | In this mode, all chambers inflates together, and<br>deflates together. Then the cycle repeats | |
| | then chamber No. (1)(2)are inflated and<br>deflated at the same time. | | |
| | Mode 3 | | |
| | The chamber No. (1)(2) are inflated and<br>deflated at the same time, Then the cycle<br>repeats. | | |
| | | | |
| Item | Proposed Device | Predicate Device | Remark |
| EMC, Electrical and Laser Safety | | | |
| Electrical Safety | Comply with IEC 60601-1,IEC<br>60601-1-11 | Comply with IEC 60601-1,IEC<br>60601-1-11 | SAME |
| EMC | Comply with IEC 60601-1-2 | Comply with IEC 60601-1-2 | SAME |
| Battery Safety | Comply with IEC 62133-2 | Comply with IEC 62133-2 | SAME |
| Patient Contact Materials and Biocompatibility | | | |
| Patient Contact<br>Materials | Terylene | Not Publicly Available | Analysis |
| Cytotoxicity | Comply with ISO 10993-5 | Comply with ISO 10993-5 | SAME |
| Sensitization | Comply with ISO 10993-10 | Comply with ISO 10993-10 | SAME |
| Irritation | Comply with ISO 10993-10 | Comply with ISO 10993-10 | SAME |
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#### Analysis 1
Although the treatment time range of subject device is 0 to 30mins, which seems to be smaller than the predicate devices, the default value is 15min which is suitable for daily use. In the process of use, the user can start or stop at any time by the power button on the hand controller, so the difference of Treatment time would not raise adversely impact on safety and effectiveness.
#### Analysis 2
Although the subject device design and specification parameter between the predicate devices, they are both complied with IEC60601-1, so the minor differences of power source and Power consumption does not raise any new issue of the safety or effectiveness.
### Analysis 3
Number of chambers is different, but the application site and treatment pressure range are the same. The minor difference of number of chambers does not raise any new issue of the safety or effectiveness.
### Analysis 4
The proposed device is different in appearance, dimension and weight from the predicate device. By complying with IEC 60601-1, the mechanical performance of the proposed device is determined to be accepted, therefore, this difference will not affect the substantially equivalency.
# Analysis 5
Although the work mode is different, while the difference of work modes just because the inflatable order of the different chambers. The treatment pressure range is the same under different work modes, so the difference of work mode would not raise adversely impact on safety and effectiveness.
#### Table 3 Safety Comparison
Analysis
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Although the materials in contact with human skin are different, they all meet the requirements of ISO 10993-5/10 and will not affect product safety.
# 10. Conclusion
The conclusion drawn from the nonclinical tests demonstrates that the subject device in 510(K) submission, the Air Pressure Foot Massager (SM-512F) is as safe, as effective, and performs as well as or better than the legally marketed predicate device K201935.
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.