Antimicrobial Susceptibility Test Discs are used for semi-quantitative in vitro susceptibility testing by standardized agar diffusion test procedures. Fosfomycin Sensi-Discs® are intended for use in determining the susceptibility to Fosfomycin of a wide range of bacteria, including Enterococcus faecalis, Enterococcus faeclum, Escherichia coli, Citrobacter diversus, Citerobacter freundii, Entercbacter aerogenes, Klebsiella oxytoca, Klebsiella pneumoniae, Proteus mirabilis, Proteus vulgaris, and Serratia marcesceus. Zone sizes used tor interpretation of tests, including control organism limits, were determined by the antimicrobic manufacturer, Forest Pharmaceuticals, Inc., and received FDA approval under NDA No. 50-717.
Device Story
Fosfomycin Sensi-Discs are paper discs impregnated with 200 mcg of the antimicrobial agent Fosfomycin. Used in clinical microbiology laboratories for semi-quantitative in vitro susceptibility testing via standardized agar diffusion methods. The discs are placed on agar plates inoculated with bacterial cultures. As the antibiotic diffuses into the agar, it inhibits bacterial growth, creating a zone of inhibition. Laboratory technicians measure the diameter of these zones to determine the susceptibility of the organism to the drug. Results assist healthcare providers in selecting appropriate antibiotic therapy for patients with bacterial infections. The device provides a standardized, reliable method for assessing antimicrobial efficacy against specific pathogens.
Clinical Evidence
No clinical data. Bench testing only; performance is based on standardized agar diffusion test procedures and established zone size interpretation criteria.
Technological Characteristics
Antimicrobial susceptibility test discs; paper-based; impregnated with 200 mcg Fosfomycin. Operates via standardized agar diffusion principle. Standalone diagnostic accessory. No software or electronic components.
Indications for Use
Indicated for in vitro agar diffusion susceptibility testing to determine bacterial susceptibility to Fosfomycin. Active against Enterococcus faecalis and Escherichia coli (clinical infections); active in vitro only against Enterococcus faeclum, Citrobacter diversus, Citrobacter freundii, Enterobacter aerogenes, Klebsiella oxytoca, Klebsiella pneumoniae, Proteus mirabilis, Proteus vulgaris, and Serratia marcesceus.
Regulatory Classification
Identification
An antimicrobial susceptibility test disc is a device that consists of antimicrobic-impregnated paper discs used to measure by a disc-agar diffusion technique or a disc-broth elution technique the in vitro susceptibility of most clinically important bacterial pathogens to antimicrobial agents. In the disc-agar diffusion technique, bacterial susceptibility is ascertained by directly measuring the magnitude of a zone of bacterial inhibition around the disc on an agar surface. The disc-broth elution technique is associated with an automated rapid susceptibility test system and employs a fluid medium in which susceptibility is ascertained by photometrically measuring changes in bacterial growth resulting when antimicrobial material is eluted from the disc into the fluid medium. Test results are used to determine the antimicrobial agent of choice in the treatment of bacterial diseases.
Predicate Devices
Ciprofloxacin, 5 mcg, Sensi-Disc®
Submission Summary (Full Text)
{0}------------------------------------------------
Image /page/0/Picture/1 description: The image shows the logo for the U.S. Department of Health & Human Services. The logo features a stylized eagle with three heads, representing the department's mission to protect the health of all Americans and provide essential human services. The eagle is surrounded by a circular border with the text "DEPARTMENT OF HEALTH & HUMAN SERVICES - USA".
Food and Drug Administration 2098 Gaither Road Rockville MD 20850
JUL 28 1997
Virginia C. Weinknecht Regulatory Affairs Specialist Becton Dickinson Microbiology Systems P.O. Box 243 Cockeysville, Maryland 21030-0243
- -
Re: K972098 Trade Name: Fosfomycin, 200 mg, Sensi-Disc® Regulatory Class: II Product Code: JTN Dated: June 2, 1997
Received: June 4, 1997
Dear Ms. Weinknecht:
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 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 Good Manufacturing Practice for Modical Devices: General (GMP) regulation (21 CFR Part 820) and that, through periodic GMP 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.
{1}------------------------------------------------
Page 2
Under the Clinical Laboratory Improvement Amendments of 1988 (CLIA-88), this device may require a CLIA complexity categorization. To determine if it does, you should contact the Centers for Disease Control and Prevention (CDC) at (770)488-7655.
This letter will allow you to begin marketing your device as described in your 510(k) premarket notification. The FDA finding of substantial equivalence of your device to a legally marketed predicate device results in a classification for your device and thus, permits your device to proceed to the market.
If you desire specific advice for your device 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) 594-4588. Additionally, for questions on the promotion and advertising of your device, 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 toll free number (800) 638-2041 or at (301) 443-6597 or at its internet address "http://www.fda.gov/cdrh/dsmamain.html"
Sincerely yours,
Steven Sutman
Steven I. Gutman, M.D., M.B.A. Director Division of Clinical Laboratory Devices Office of Device Evaluation Center for Devices and Radiological Health
Enclosure
{2}------------------------------------------------
K 973098
Date 6/2/97
## SUMMARY OF SAFETY AND EFFECTIVENESS
SUBMITTED BY:
Virginia C. Weinknecht Regulatory Affairs Specialist Becton Dickinson Microbiology Systems P.O. Box 243 Cockeysville, MD 21030-0243
NAME OF DEVICE:
| Trade Name: | Fosfomycin, 200 mcg, Sensi-Discs<br>Catalog Numbers 4331709, 4331710 |
|--------------------------|----------------------------------------------------------------------|
| Common Name/Description: | Antimicrobial Susceptibility Test Discs |
| Classification Name: | Antimicrobial Susceptibility Test Discs |
| PREDICATE DEVICE: | Other BBL® Sensi-Discs® such as<br>Ciprofloxacin, 5 mcg, Sensi-Disc® |
DEVICE DESCRIPTION:
PRE
INTENDED USE:
Antimicrobial Susceptibility Test Discs are used for semi-quantitative in vitro susceptibility testing by standardized agar diffusion test procedures. Fosfomycin Sensi-Discs® are intended for use in determining the susceptibility to Fosfomycin of a wide range of bacteria, including Enterococcus faecalis, Enterococcus faeclum, Escherichia coli, Citrobacter diversus, Citerobacter freundii, Entercbacter aerogenes, Klebsiella oxytoca, Klebsiella pneumoniae, Proteus mirabilis, Proteus vulgaris, and Serratia marcesceus. Zone sizes used tor interpretation of tests, including control organism limits, were determined by the antimicrobic manufacturer, Forest Pharmaceuticals, Inc., and received FDA approval under NDA No. 50-717.
{3}------------------------------------------------
Page _________________________________________________________________________________________________________________________________________________________________________
Device Name: Fosfomycin, 200 mg, Sensi-Disc®
Indications For Use:
Use of BBL Fosfomycin Sensi-Discs®.for in .vitro .agar diffusion.susceptibility. testing is indicated when there is a need to determine the susceptibility of bacteria to Fosfomycin. Fosfomycin has been shown to be active against most strains of microorganisms listed below, as described in the Forest Pharmaceuticals, Inc., package insert for this antimicrobic.
## Active In Vitro and In Clinical Infections Against: Aerobic Gram-Positive Microorganisms Enterococcus faecalis Aerobic Gram-Negative Microorganisms Escherichia coli Active In Vitro Only Against: Aerobic Gram-Positive Microorganisms Enterococcus faeclum Aerobic Gram-Negative Microorganisms Citrobacter diversus Citerobacter freundii Enterobacter aerogenes Klebsiella oxytoca Klebsiella pneumoniae Proteus mirabilis Proteus vulgaris Serratia marcesceus
(PLEASE DO NOT WRITE BELOW THIS LINE-CONTINUE ON ANOTHER PAGE IF NEEDED)
| | Concurrence of CDRH, Office of Device Evaluation (ODE) | |
|---------------|--------------------------------------------------------|--|
| | (Division Sign-Off) | |
| | Division of Clinical Laboratory Devices | |
| 510(k) Number | K972098 | |
| Prescription Use | | OR | Over-The-Counter Use |
|--------------------|--|----|------------------------|
| Per 21 CFR 801.109 | | | Optional Format 1-2-96 |
Predicate graph will load when search results are available.
Embedding visualization will load when search results are available.
PDF viewer will load when search results are available.
Loading panels...
Select an item from Submissions
Click any panel, subpart, regulation, product code, or device to see details here.
Section Matches
Results will appear here.
Product Code Matches
Results will appear here.
Special Control Matches
Results will appear here.
Loading collections...
Loading
My Alerts
You will receive email notifications based on the filters and frequency you set for each alert.
Sort by:
Create Alert
Search Filters
Agent Token
Create a read-only bearer token for Claude, ChatGPT, or other agents that can call HTTP APIs.
Copy this now. It will not be shown again.
Connected apps
Apps you authorized through browser sign-in. Disconnecting revokes their access immediately.
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.