510(k) · Cleared
ClearedDiagnostic Ultrasonic Transducer
Data to Oct 25, 2026 (FDA decisions) Oct 12, 2026 (recalls) Sep 30, 2026 (MAUDE) refreshed weekly
Toshiba America Medical Systems, In.C · IYO System, Imaging, Pulsed Echo, Ultrasonic
Cleared on May 17, 1996 as substantially equivalent to K894632 (Toshiba America Medical Systems, In.C, 1989) after a 777-day review. Its family tree reaches back 1 generation to 1989. 3 of the 406 devices in its family, counting itself, have a Class I recall. 404 later devices descend from it.
- Decided
- May 17, 1996
- Review
- 777 days
- Class
- Class II
- Product code
- IYO
- Recalls
- None
- Predicates
- 1
Its longest line of descent runs back 1 generation to K894632 (1989). 404 later devices descend from it, 1 citing it directly. 3 of the 406 devices in this family, counting this one, have a Class I recall.
- Root · 1 generation backK894632 Model SSH-140A Ultrasound Imaging SystemToshiba America Medical Systems, In.C · 1989
- This deviceK941593 Diagnostic Ultrasonic TransducerToshiba America Medical Systems, In.C · 1996
- Descendant · cites it directly · 403 of its ownK970047 Phased Array Transducer - - PSK-20CTToshiba America Medical Systems, In.C · 1997
- Descendant · 2 generations on · 212 of its ownK991858 Ssa-390A/Power Vision 8000Toshiba America Medical Systems, In.C · 1999
- Descendant · 3 generations on · 211 of its ownK013633 Ssa-770A, Aplio Ultrasound SystemToshiba America Medical Systems, In.C · 2001
- Descendant · 4 generations on · 210 of its ownK022400 Ssa-700A, Aplio Diagnostic Ultrasound SystemToshiba America Medical Systems, In.C · 2002 · Recalled
- Descendant · 4 generations on · 209 of its ownK032281 Ssa-770A - Version 4, Aplio Diagnostic Ultrasound SystemToshiba America Medical Systems, In.C · 2003
Showing 5 of 404 descendants. See all descendants
Descendants cleared per year
Class I recalls in this family
Most influential descendants
Showing 5 of 404 · See all- K970047Phased Array Transducer - - PSK-20CTToshiba America Medical Systems, In.C · 1997 · cites it directly403descendants
- K991858Ssa-390A/Power Vision 8000Toshiba America Medical Systems, In.C · 1999 · 2 generations on212descendants
- K013633Ssa-770A, Aplio Ultrasound SystemToshiba America Medical Systems, In.C · 2001 · 3 generations on211descendants
- K022400Ssa-700A, Aplio Diagnostic Ultrasound SystemToshiba America Medical Systems, In.C · 2002 · 4 generations on210descendants
- K032281Ssa-770A - Version 4, Aplio Diagnostic Ultrasound SystemToshiba America Medical Systems, In.C · 2003 · 4 generations on209descendants
View FIG. 1 as a table
Line of descent and top descendants
| Generation | Number | Device | Applicant | Decided | Recalls |
|---|---|---|---|---|---|
| −1 | K894632 | Model SSH-140A Ultrasound Imaging System | Toshiba America Medical Systems, In.C | 1989 | — |
| 0 (this device) | K941593 | Diagnostic Ultrasonic Transducer | Toshiba America Medical Systems, In.C | 1996 | — |
| +1 | K970047 | Phased Array Transducer - - PSK-20CT | Toshiba America Medical Systems, In.C | 1997 | — |
| +2 | K991858 | Ssa-390A/Power Vision 8000 | Toshiba America Medical Systems, In.C | 1999 | — |
| +3 | K013633 | Ssa-770A, Aplio Ultrasound System | Toshiba America Medical Systems, In.C | 2001 | — |
| +4 | K022400 | Ssa-700A, Aplio Diagnostic Ultrasound System | Toshiba America Medical Systems, In.C | 2002 | 1 |
| +4 | K032281 | Ssa-770A - Version 4, Aplio Diagnostic Ultrasound System | Toshiba America Medical Systems, In.C | 2003 | — |
Descendants by year cleared
| Year cleared | Devices | With a Class I recall |
|---|---|---|
| 1997 | 1 | 0 |
| 1999 | 3 | 0 |
| 2001 | 2 | 0 |
| 2002 | 1 | 0 |
| 2003 | 2 | 0 |
| 2004 | 2 | 0 |
| 2005 | 4 | 0 |
| 2006 | 1 | 0 |
| 2007 | 7 | 0 |
| 2008 | 6 | 0 |
| 2009 | 11 | 0 |
| 2010 | 2 | 0 |
| 2011 | 5 | 0 |
| 2012 | 12 | 0 |
| 2013 | 6 | 0 |
| 2014 | 18 | 0 |
| 2015 | 13 | 0 |
| 2016 | 18 | 0 |
| 2017 | 22 | 0 |
| 2018 | 28 | 0 |
| 2019 | 18 | 0 |
| 2020 | 35 | 1 |
| 2021 | 24 | 0 |
| 2022 | 28 | 0 |
| 2023 | 30 | 0 |
| 2024 | 25 | 0 |
| 2025 | 48 | 2 |
| 2026 | 32 | 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.
3 devices in this family have a Class I recall. 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 IYO device
- #1 K243937 Accuro 3Sscore 20.5 · 18 generations · no Class I recall
- #2 Held for the reportin the report
- #3 Held for the reportin the report
What was it cleared against? (2)
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 |
|---|---|---|---|
| * | K894632 | Model SSH-140A Ultrasound Imaging SystemSummary page 1…0A Track I Diagnostic Ultrasound system and claims substantial equivalency to the PSF-37FT, which was cleared for use with the SSH-140A Diagnostic Ultrasound System via X894632 and with the P3-2 Transcranial Doppler transducer distributed by Advanced Techrology Labs (ATL). The PSH-25GT and PSF-37FT probe… | 1989 |
| * | — | P3-2 Transcranial Doppler transducer Named without a submission number |
What descends from it? (404)
See all 4041 later device cites it directly; ranked here by how many devices descend from each in turn.
| Number | Device | Decided | Descendants |
|---|---|---|---|
| K970047 | Phased Array Transducer - - PSK-20CT | 1997 | 403 |
Has anything in its family been recalled? (3 Class I)
No FDA recall names this device.
Relatives with a Class I recall
Class I is FDA’s most serious recall class. A recall in the family tree is context for this device, not evidence about it.
- K193517ViziShot 2 FLEXOlympus Surgical Technologies America · 2020 · 9 generations on · ◆ in the 2020 descendants bar of FIG. 11 Class I recall
- K242670Lumify Diagnostic Ultrasound SystemPhilips Ultrasound · 2025 · 11 generations on · ◆ in the 2025 descendants bar of FIG. 11 Class I recall
- K242519Lumify Diagnostic Ultrasound SystemPhilips Ultrasound · 2025 · 11 generations on · ◆ in the 2025 descendants bar of FIG. 11 Class I recall
What does this lineage say?
- Its one ancestor has no recall.
- Of its descendants, K970047 (Toshiba America Medical Systems, In.C, 1997) has gone furthest, with 403 descendants of its own.
How does its category compare?
All IYO devicesIYO System, Imaging, Pulsed Echo, Ultrasonic: FDA decisions, review times, recalls and adverse event reports over 20 years.
FDA decisions per year · IYO
7in 2025
2026 to Oct 25, outlined.
Median 510(k) review, days · IYO
171in 2025
Receipt to decision; years with fewer than 3 clearances left blank.
Recalls per year · IYO
1in 2022
Class I (0 since 2007) Class II/III not classified
Adverse event reports per year · IYO
485in 2025
MAUDE reports naming product code IYO, 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 | 20 | 17 | 4 | 39 |
| 2008 | 14 | 36 | 5 | 20 |
| 2009 | 13 | 79 | 9 | 27 |
| 2010 | 15 | 113 | 8 | 20 |
| 2011 | 11 | 69 | 0 | 58 |
| 2012 | 15 | 68 | 2 | 78 |
| 2013 | 17 | 50 | 3 | 436 |
| 2014 | 14 | 63 | 2 | 304 |
| 2015 | 19 | 46 | 1 | 268 |
| 2016 | 10 | 36 | 0 | 254 |
| 2017 | 19 | 72 | 0 | 238 |
| 2018 | 14 | 56 | 1 | 368 |
| 2019 | 13 | 59 | 1 | 537 |
| 2020 | 11 | 57 | 0 | 498 |
| 2021 | 15 | 64 | 11 | 617 |
| 2022 | 5 | 190 | 1 | 511 |
| 2023 | 11 | 177 | 0 | 527 |
| 2024 | 10 | 220 | 0 | 640 |
| 2025 | 7 | 171 | 0 | 485 |
| 2026 | 10 | 139 | 1 | — |
What is it indicated for?
The PSH-25GT and P3-2 probes are intended for transcranial doppler applications.
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/K941593 · printed Nov 6, 2026
Cite this page
510(k) Report. “K941593: Diagnostic Ultrasonic Transducer.” Lineage record from FDA 510(k) data and the FDA summary. Updated Nov 3, 2026. Accessed Nov 6, 2026. https://510kreport.com/device/K941593
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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