510(k) · Cleared
Recalled · Class II · 2017Breathing Circuit Bacterial Filter
Data to Oct 25, 2026 (FDA decisions) Oct 12, 2026 (recalls) Sep 30, 2026 (MAUDE) refreshed weekly
King Systems Corp. · CAH Filter, Bacterial, Breathing-Circuit
Cleared on Mar 12, 1998 after a 157-day review. FDA’s file for it is a 510(k) statement, which names no predicate. 1 later device descends from it. It has been recalled once.
- Decided
- Mar 12, 1998
- Review
- 157 days
- Class
- Class II
- Product code
- CAH
- Recalls
- 1
- Predicates
- 0
1 later device descends from it, 1 citing it directly.
- This deviceK973797 Breathing Circuit Bacterial FilterKing Systems Corp. · 1998
- Descendant · cites it directly · 0 of its ownK121026 Flo-Guard Breathing FilterIntersurgical, Inc. · 2012
Most influential descendants
Showing 1 of 1 · See all- K121026Flo-Guard Breathing FilterIntersurgical, Inc. · 2012 · cites it directly0descendants
View FIG. 1 as a table
Line of descent and top descendants
| Generation | Number | Device | Applicant | Decided | Recalls |
|---|---|---|---|---|---|
| 0 (this device) | K973797 | Breathing Circuit Bacterial Filter | King Systems Corp. | 1998 | — |
| +1 | K121026 | Flo-Guard Breathing Filter | Intersurgical, Inc. | 2012 | — |
Descendants by year cleared
| Year cleared | Devices | With a Class I recall |
|---|---|---|
| 2012 | 1 | 0 |
Sources: FDA 510(k) database (decision fields), the FDA 510(k) statement (indications), FDA recall and enforcement reports, and MAUDE; processed by 510(k) Report. Verify on FDA.gov · Methodology and accuracy.
Planning a device in CAH? A 510(k) Report weighs predicate choices, recall history and review times for a new device like this one.
Top candidate predicates for a new CAH device
- #1 K251583 Ambu® Virobac II® Exhalation Filterscore 11.6 · 2 generations · no Class I recall
- #2 Held for the reportin the report
- #3 Held for the reportin the report
What was it cleared against?
FDA’s file for it is a 510(k) statement, which names no predicate.
What descends from it? (1)
1 later device cites it directly; ranked here by how many devices descend from each in turn.
| Number | Device | Decided | Descendants |
|---|---|---|---|
| K121026 | Flo-Guard Breathing Filter | 2012 | 0 |
Has anything in its family been recalled? (0 Class I)
Recalls of this device
| Date | Class | Recall | Root cause | Reason |
|---|---|---|---|---|
| Mar 15, 2017 | Class II | Z-0321-2018 | Nonconforming Material/Component | Potential for leak test failures. |
No ancestor or descendant has a Class I recall.
What does this lineage say?
- Of its descendants, K121026 (Intersurgical, Inc., 2012) has gone furthest, with 0 descendants of its own.
How does its category compare?
All CAH devicesCAH Filter, Bacterial, Breathing-Circuit: FDA decisions, review times, recalls and adverse event reports over 20 years.
FDA decisions per year · CAH
2in 2024
2026 to Oct 25, outlined.
Median 510(k) review, days · CAH
237in 2023
Receipt to decision; years with fewer than 3 clearances left blank.
Recalls per year · CAH
1in 2025
Class I (7 since 2007) Class II/III not classified
Adverse event reports per year · CAH
77in 2025
MAUDE reports naming product code CAH, not matched to any one device; reports are not rates.
View these four charts as a table
| Year | Decisions | Median 510(k) review, days | Recalls (Class I) | MAUDE reports |
|---|---|---|---|---|
| 2007 | 2 | — | 0 | 32 |
| 2008 | 1 | — | 0 | 27 |
| 2009 | 4 | 111 | 0 | 18 |
| 2010 | 5 | 216 | 2 | 40 |
| 2011 | 3 | 281 | 0 | 9 |
| 2012 | 3 | 212 | 0 | 16 |
| 2013 | 1 | — | 1 | 47 |
| 2014 | 4 | 250 | 1 | 98 |
| 2015 | 2 | — | 0 | 51 |
| 2016 | 0 | — | 0 | 34 |
| 2017 | 1 | — | 1 | 29 |
| 2018 | 0 | — | 0 | 33 |
| 2019 | 2 | — | 0 | 30 |
| 2020 | 2 | — | 0 | 33 |
| 2021 | 2 | — | 0 | 56 |
| 2022 | 3 | 204 | 6 (6) | 67 |
| 2023 | 3 | 237 | 0 | 40 |
| 2024 | 2 | — | 0 | 51 |
| 2025 | 0 | — | 1 (1) | 77 |
| 2026 | 2 | — | 0 | — |
What is it indicated for?
A bacterial filter is indicated for use when the care provider desires to protect the patient, care provider, equipment, or all three from the transference of bacteria or virus through the breathing circuit. This filter is provided only in combination with a King Systems Universal F2™ breathing circuit. Within this combination the overall intended use is to administer medical gases and/or anesthetic gases to a patient during anesthesia for inhalation, or medical gases to a patient during respiratory care inhalation.
Indications for use read by OCR from a scanned FDA 510(k) statement, so letters may be misread. Check the PDF before quoting it.
https://510kreport.com/device/K973797 · printed Nov 6, 2026
Cite this page
510(k) Report. “K973797: Breathing Circuit Bacterial Filter.” Lineage record from FDA 510(k) data and the FDA summary. Updated Nov 3, 2026. Accessed Nov 6, 2026. https://510kreport.com/device/K973797
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Record history
- FDA decision record loaded May 2, 2026
- Summary read Oct 13, 2026 (extraction version 9eaa42aa01ed)
- Lineage and recalls computed Nov 3, 2026
- Page last updated Nov 3, 2026