510(k) · Cleared
ClearedKnightstar 335
Data to Oct 25, 2026 (FDA decisions) Oct 12, 2026 (recalls) Sep 30, 2026 (MAUDE) refreshed weekly
Puritan Bennett Corp. · MNT Continuous, Minimal Ventilatory Support, Facility Use Ventilator
Cleared on Jul 16, 1998 as substantially equivalent to K955324 (Respironics, Inc., 1996) after a 337-day review. Its family tree reaches back 3 generations to 1983.
- Decided
- Jul 16, 1998
- Review
- 337 days
- Class
- Class II
- Product code
- MNT
- Recalls
- None
- Predicates
- 1
Its longest line of descent runs back 3 generations to K833786 (1983). 7 ancestors in all, the oldest K811102 (1981). No later device cites it as a predicate yet.
View FIG. 1 as a table
Line of descent and top descendants
| Generation | Number | Device | Applicant | Decided | Recalls |
|---|---|---|---|---|---|
| −3 | K833786 | Microprocessor Ventilator 7200 | Puritan Bennett Corp. | 1983 | — |
| −2 | K951264 | Bipap Model S/T-D | Respironics, Inc. | 1996 | — |
| −1 | K955324 | Bipap S/T-D 30 System | Respironics, Inc. | 1996 | — |
| 0 (this device) | K973004 | Knightstar 335 | Puritan Bennett Corp. | 1998 | — |
Other ancestors by year cleared
| Year cleared | Devices | With a Class I recall |
|---|---|---|
| 1981 | 1 | 0 |
| 1988 | 1 | 0 |
| 1991 | 1 | 0 |
| 1995 | 1 | 0 |
Sources: FDA 510(k) database (decision fields), the FDA summary (predicates and indications), FDA recall and enforcement reports, and MAUDE; processed by 510(k) Report. Verify on FDA.gov · Methodology and accuracy.
Planning a device in MNT? 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 MNT device
- #1 K233643 F&P Airvo 3 NIV (PT311US)score 13.5 · 10 generations · no Class I recall
- #2 Held for the reportin the report
- #3 Held for the reportin the report
What was it cleared against? (1)
Devices the submitter claimed this one is substantially equivalent to (*), and reference devices cited for a specific test or feature (†), as written in the FDA summary.
| Type | Number | Device | Decided |
|---|---|---|---|
| * | K955324 | Bipap S/T-D 30 SystemSummary page 1…e Device Equivalence We are claiming substantial equivalence to the Respironics BiPAP S/T-D 30 with Detachable Control Panel 30, cleared for commercial distribution per K955324. 4.0 Device Description The KnightStar 335 is a microprocessor-controlled flow generator capable or monitoring and controlling… | 1996 |
What descends from it?
No later submission names this one as a predicate yet.
Has anything in its family been recalled? (0 Class I)
No FDA recall names this device.
No ancestor or descendant has a Class I recall.
What does this lineage say?
- The line of descent spans 15 years and passes through 2 companies; a new generation was cleared every 1.6 years on median.
- None of the 7 ancestors has a recall.
- 1 other device also cites its predicate K955324.
How does its category compare?
All MNT devicesMNT Continuous, Minimal Ventilatory Support, Facility Use Ventilator: FDA decisions, review times, recalls and adverse event reports over 20 years.
FDA decisions per year · MNT
1in 2025
2026 to Oct 25, outlined.
Median 510(k) review, days · MNT
Too few MNT 510(k)s in any year since 2007 to give a median.
Recalls per year · MNT
5in 2022
Class I (6 since 2007) Class II/III not classified
Adverse event reports per year · MNT
3,545in 2025
MAUDE reports naming product code MNT, 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 | 0 | — | 1 | 59 |
| 2008 | 1 | — | 0 | 76 |
| 2009 | 2 | — | 1 | 29 |
| 2010 | 0 | — | 1 | 63 |
| 2011 | 2 | — | 0 | 170 |
| 2012 | 2 | — | 0 | 257 |
| 2013 | 1 | — | 0 | 322 |
| 2014 | 0 | — | 0 | 887 |
| 2015 | 0 | — | 0 | 1,657 |
| 2016 | 0 | — | 0 | 2,515 |
| 2017 | 1 | — | 0 | 2,878 |
| 2018 | 0 | — | 0 | 2,203 |
| 2019 | 0 | — | 1 (1) | 9,350 |
| 2020 | 1 | — | 33 | 4,170 |
| 2021 | 0 | — | 0 | 3,790 |
| 2022 | 1 | — | 5 (5) | 3,277 |
| 2023 | 1 | — | 0 | 4,565 |
| 2024 | 2 | — | 0 | 4,808 |
| 2025 | 1 | — | 0 | 3,545 |
| 2026 | 1 | — | 0 | — |
What is it indicated for?
The Nellcor Puritan Bennett KnightStar 335 is indicated for use in treating spontaneously breathing patients over 30 Kg with obstructive sleep apnea or respiratory insufficiency in a homecare, hospital or institutional environment. In addition, when used with a Control Module Type 1 and an airway pressure monitor, it is indicated for use in treating spontaneously breathing patients over 30 Kg with respiratory failure in a hospital or institutional environment.
Indications for use read by OCR from a scanned FDA summary, so letters may be misread. Check the PDF before quoting it.
https://510kreport.com/device/K973004 · printed Nov 5, 2026
Cite this page
510(k) Report. “K973004: Knightstar 335.” Lineage record from FDA 510(k) data and the FDA summary. Updated Nov 3, 2026. Accessed Nov 5, 2026. https://510kreport.com/device/K973004
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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