The Amplaid A724 A728 are Programmable Admittance Meters which can: Evaluate middle ear functions such as otitis media, glue ear, eardrum scar tissues, perform . myringotomy status, ossicular chain discontinuity ear canal volume, otosclerosis, stapes fixation. Perform Acoustic reflex test. Determine acoustic reflex threshold ● Perform reflex decay test. It is intended for use by a qualified/trained audiologist on both adult and pediatric subjects for measurement and diagnosis of various types of hearing losses.
Device Story
Amplaid A724 and A728 are clinical admittance meters; used by audiologists in clinical settings to evaluate middle ear function. Device performs plane and compensated tympanometry; ipsilateral and contralateral acoustic reflex testing; reflex threshold determination; reflex decay measurements. Input involves acoustic stimuli; device processes impedance/admittance data; output provided via built-in thermal printer and liquid crystal display. Bi-directional RS232 interface allows data transfer. Results assist clinicians in diagnosing conditions like otitis media, stapes fixation, and ossicular chain discontinuity; facilitates clinical decision-making regarding hearing loss management.
Clinical Evidence
Bench testing only. No clinical data provided. Safety and effectiveness established through comparison of technical specifications and performance against the predicate device, confirming compliance with relevant IEC and ANSI standards.
Technological Characteristics
Clinical admittance meter; performs tympanometry and acoustic reflex testing. Features built-in LCD, keyboard, and thermal printer. Connectivity: Bi-directional RS232. Energy: 115/230 Vac, 50-60 Hz. Standards: IEC 61027 (1993), ANSI S3.39 (1987), ANSI S3.6 (1996), EN 60601-1 Class I Type BF (1990).
Indications for Use
Indicated for adult and pediatric patients requiring evaluation of middle ear function (e.g., otitis media, ossicular chain discontinuity, otosclerosis) and acoustic reflex testing (threshold and decay) for the diagnosis of hearing loss.
Regulatory Classification
Identification
An auditory impedance tester is a device that is intended to change the air pressure in the external auditory canal and measure and graph the mobility characteristics of the tympanic membrane to evaluate the functional condition of the middle ear. The device is used to determine abnormalities in the mobility of the tympanic membrane due to stiffness, flaccidity, or the presence of fluid in the middle ear cavity. The device is also used to measure the acoustic reflex threshold from contractions of the stapedial muscle, to monitor healing of tympanic membrane grafts or stapedectomies, or to monitor followup treatment for inflammation of the middle ear.
Special Controls
*Classification.* Class II (special controls). The device, when it is a tympanometer or auditory impedance tester that complies with FDA-recognized consensus standard ANSI S3.39, is exempt from the premarket notification procedures in subpart E of part 807 of this chapter subject to the limitations in § 874.9.
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K912370
SEP 2 0 1999
EXHIBIT 2 Amplifon S.p.A. Via Ripamonti, 133 20141 Milan, ITALY Tel ++39-02-57472482 Fax ++39-02-57409427 Contact: Giovanni Rollier, President
July 13, 1999
# 510(k) Summary of Safety and Effectiveness
- 1. Identification of the Device: Proprietary-Trade Name: Amplaid A724 and A728 Classification Name: Auditory Impedance Tester 77ETY Common/Usual Name: Clinical Admittance Meter
- 2. Equivalent legally marketed devices This product is similar in design and function to the Amplaid 770 Admittance Meter (K903066)
- 3. Indications for Use (intended use) The Amplaid A724 A728 are Programmable Admittance Meters which can:
- Evaluate middle ear functions such as otitis media, glue ear, eardrum scar tissues, perform . myringotomy status, ossicular chain discontinuity ear canal volume, otosclerosis, stapes fixation.
- Perform Acoustic reflex test.
- Determine acoustic reflex threshold ●
- Perform reflex decay test. .
It is intended for use by a qualified/trained audiologist on both adult and pediatric subjects for measurement and diagnosis of various types of hearing losses.
- 4. Description of the Device: The Amplaid A724 and A728 ADMITTANCE METERS perform plane and compensated tympanometry; Programmed and manual stimuli for ipsilateral and contralateral acoustic reflex; Automatic reflex threshold; and Decay measurements.
- 5. Safety and Effectiveness, comparison to predicate device. The results of bench and user testing indicates that the new device is as safe and effective as the predicate device.
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| Characteristic | Predicate device: | New device: |
|------------------------------------------|-------------------------------------------------------------------------------------------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| | Amplaid 770 Per K903066 | Amplaid A724 -A728 |
| Intended Use: | Clinical auditory impedance<br>testing applications | (Same) |
| Technical characteristics | | |
| Physical characteristics: | | |
| Computer interface | RS232 Transmit only | RS232 Bi-directional |
| Display | Built-in liquid crystal | (Same) |
| Control interface | Built-in keyboard | (Same) |
| Size/weight | 17.3" W x 19.3" D x 7" H,<br>28 lbs. | 19.6"w x 16"d x 8"h<br>18.8 lbs. |
| Energy Source: | 115/230 Vac, ± 10%, 50-60 Hz | (Same) |
| Hardcopy Output: | Built-in Thermal printer | (Same) |
| Standards and Safety<br>characteristics: | | |
| Audiometric: | ANSI 3.6, 1969, ISO 1975 for<br>contralateral, 2 cm3 cavity for<br>ipsilateral, IEC 61027 | (Same or better) Standards<br>updated and added:<br>IEC 61027 (1993); Instruments<br>for the measurement of aural<br>acoustic impedance/admittance<br>ANSI S3.39(1987): Specifications<br>for Instruments to Measure Aural<br>Acoustic Impedance and<br>Admittance (Aural Acoustic<br>Immittance);<br>IEC 60645-1: Audiometers - Part<br>1: Pure-tone audiometers<br>ANSI S3.6 (1996): Specification<br>for audiometers;<br>EN ISO 389 (1995): Acoustics -<br>Standard reference zero for the<br>calibration of pure-tone air<br>conduction audiometers |
| Electrical safety: | UL-544, IEC 601 | Safety: EN 60601-1 Class I Type<br>BF (1990); EN 60601-1/A1<br>(1993);<br>EN 60601-1/A2 (1995); EN<br>60601-1/A13 (1996)<br>EMC: EN 60601-1-2 (1993) |
# 6. Substantial Equivalence Chart
#### 7. Conclusion
After analyzing both bench and user testing data, it is the conclusion of Amplifon S.p.A. that the Amplaid A724 and A728 are as safe and effective as the predicate device, has few technological differences, and has no new indications for use, thus rendering it substantially equivalent to the predicate device.
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Image /page/2/Picture/1 description: The image shows the logo for the U.S. Department of Health & Human Services. The logo consists of a circular seal with the text "DEPARTMENT OF HEALTH & HUMAN SERVICES • USA" around the perimeter. Inside the circle is an abstract symbol resembling a stylized eagle or bird in flight, composed of three curved lines above three wavy lines.
Food and Drug Administration 9200 Corporate Boulevard Rockville MD 20850
SEP 2 0 1999
Mr. Daniel Kamm, P.E. Kamm & Associates PO Box 7007 Deerfield IL 60015 USA
Re: K992370
Trade Name: Amplaid A724 and A728 Clinical Automatic Programmable Admittance Meters Regulatory Class: II Product Code: 77 ETY Dated: July 13, 1999 Received: July 15, 1999
Dear Mr. Kamm:
We have reviewed your Section 510(k) notification of intent to market the device referenced above and we have determined the device is substantially equivalent (for the indications for use stated in the enclosure) to 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). 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 (Premarket Approval), it may be subject to such additional controls. Existing major regulations affecting your device can be found in the Code of Federal Regulations, Title 21, Parts 800 to 895. A substantially equivalent determination assumes compliance with the current Good Manufacturing Practice requirements, as set forth in the Quality System Regulation (QS) for Medical Devices: General regulation (21 CFR Part 820) and that, through periodic (QS) inspections, the Food and Drug Administration (FDA) will verify such assumptions. Failure to comply with the GMP regulation may result in regulatory action. In addition, FDA may publish further announcements concerning your device in the Federal Register. Please note: this response to your premarket notification submission does not affect any obligation you might have under sections 531 through 542 of the Act for devices under the Electronic Product Radiation Control provisions, or other Federal laws or regulations .
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# Page 2 - Mr. Daniel Kamm, P.E.
This letter will allow you to begin marketing your devices as described in your 510(k) premarket notification. The FDA finding of substantial equivalence of your devices to legally marketed predicate devices results in a classification for your devices and thus, permits your devices to proceed to the market.
If you desire specific advice for your devices on our labeling regulation (21 CFR Part 801 and additionally 809.10 for in vitro diagnostic devices), please contact the Office of Compliance at (301) 594-4613. Additionally, for questions on the promotion and advertising of your devices, please contact the Office of Compliance at (301) 594-4639. Also, please note the regulation entitled, "Misbranding by reference to premarket notification" (21 CFR 807.97). Other general information on your responsibilities under the Act may be obtained from the Division of Small Manufacturers Assistance at its tollfree number (800) 638-2041 or at (301) 443-6597.
Sincerely yours,
Alvarez Rosenthal
A. Ralph Rosenthal, M.D. Director Division of Ophthalmic Devices Office of Device Evaluation Center for Devices and Radiological Health
Enclosure
{4}------------------------------------------------
### j) Indications for Use
510(k) Number K9923 70
Device Name: Amplaid A724 and A728 Clinical Automatic Programmable Admittance Meters
Indications for Use: The Amplaid A724 and A728 are Programmable Admittance Meters which can
- 1. Evaluate middle ear functions such as otitis media, glue ear, eardrum scar tissues, perform myringotomy status, ossicular chain discontinuity ear canal volume, otosclerosis, stapes fixation.
- 2. Perform Acoustic reflex test.
- 3. Determine acoustic reflex threshold
- 4. Perform reflex decay test.
They is intended for use by a qualified/trained audiologist on both adult and pediatric subjects for measurement of acoustic impedance.
Concurrence of CDRH, Office of Device Evaluation (ODE)
Ray J. Lankester
OR
Prescription Use /
Over the Counter Use (Per 21 CFR 801.109)
. "
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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.