510(k) · Cleared
ClearedCodman Lhalo Split Ring Retractor System
Data to Oct 25, 2026 (FDA decisions) Oct 12, 2026 (recalls) Sep 30, 2026 (MAUDE) refreshed weekly
Codman & Shurtleff, Inc. · GZT Retractor, Self-Retaining, For Neurosurgery
Cleared on Jul 31, 1991 after a 9-day review. FDA lists a 510(k) statement for it but has not posted the file, so its predicates are not known. 1 of the 14 devices in its family, counting itself, has a Class I recall. 13 later devices descend from it.
- Decided
- Jul 31, 1991
- Review
- 9 days
- Class
- Class II
- Product code
- GZT
- Recalls
- None
- Predicates
- 0
13 later devices descend from it, 2 citing it directly. 1 of the 14 devices in this family, counting this one, has a Class I recall.
- This deviceK913233 Codman Lhalo Split Ring Retractor SystemCodman & Shurtleff, Inc. · 1991
- Descendant · cites it directly · 10 of its ownK032331 Doro Radiolucent Headrest System and Horseshoe Headrests,and…Pro-Med Instruments GmbH · 2003 · Recalled (Class I)
- Descendant · 2 generations on · 7 of its ownK063494 Doro Radiolucent Headrest System ( Also Mri-Compatible) and ComponentsPro-Med Instruments GmbH · 2007
- Descendant · 3 generations on · 4 of its ownK072208 Mayfield Disposable and Reusable Titanium Skull PinsIntegra LifeSciences Corporation · 2007
- Descendant · 3 generations on · 2 of its ownK103493 Head Fiation Device (HFD 100)Imris, Inc. · 2011 · Recalled
- Descendant · 3 generations on · 1 of its ownK191740 DORO LUCENT® iXI and iMRI Headrest SystemPro Med Instruments GmbH · 2020
Showing 5 of 13 descendants. See all descendants
Descendants cleared per year
Class I recalls in this family
- K032331 Doro Radiolucent Headrest System and Horseshoe…cites it directly · 2003
Most influential descendants
Showing 5 of 13 · See all- K032331Doro Radiolucent Headrest System and Horseshoe Headrests,and Non-Radiolucent J-Arm…Pro-Med Instruments GmbH · 2003 · cites it directly10descendants
- K063494Doro Radiolucent Headrest System ( Also Mri-Compatible) and ComponentsPro-Med Instruments GmbH · 2007 · 2 generations on7descendants
- K072208Mayfield Disposable and Reusable Titanium Skull PinsIntegra LifeSciences Corporation · 2007 · 3 generations on4descendants
- K103493Head Fiation Device (HFD 100)Imris, Inc. · 2011 · 3 generations on2descendants
- K191740DORO LUCENT® iXI and iMRI Headrest SystemPro Med Instruments GmbH · 2020 · 3 generations on1descendant
View FIG. 1 as a table
Line of descent and top descendants
| Generation | Number | Device | Applicant | Decided | Recalls |
|---|---|---|---|---|---|
| 0 (this device) | K913233 | Codman Lhalo Split Ring Retractor System | Codman & Shurtleff, Inc. | 1991 | — |
| +1 | K032331 | Doro Radiolucent Headrest System and Horseshoe Headrests,and Non-Radiolucent… | Pro-Med Instruments GmbH | 2003 | Class I |
| +2 | K063494 | Doro Radiolucent Headrest System ( Also Mri-Compatible) and Components | Pro-Med Instruments GmbH | 2007 | — |
| +3 | K072208 | Mayfield Disposable and Reusable Titanium Skull Pins | Integra LifeSciences Corporation | 2007 | — |
| +3 | K103493 | Head Fiation Device (HFD 100) | Imris, Inc. | 2011 | 3 |
| +3 | K191740 | DORO LUCENT® iXI and iMRI Headrest System | Pro Med Instruments GmbH | 2020 | — |
Descendants by year cleared
| Year cleared | Devices | With a Class I recall |
|---|---|---|
| 2003 | 1 | 1 |
| 2007 | 2 | 0 |
| 2011 | 1 | 0 |
| 2012 | 1 | 0 |
| 2014 | 1 | 0 |
| 2018 | 1 | 0 |
| 2019 | 1 | 0 |
| 2020 | 1 | 0 |
| 2021 | 1 | 0 |
| 2024 | 1 | 0 |
| 2025 | 1 | 0 |
| 2026 | 1 | 0 |
Sources: FDA 510(k) database (decision fields), FDA recall and enforcement reports, and MAUDE; processed by 510(k) Report. Verify on FDA.gov · Methodology and accuracy.
1 device in this family has 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 GZT device
- #1 K252995 Durashield Device Kitscore 12.6 · 3 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 lists a 510(k) statement for it but has not posted the file, so its predicates are not known.
What descends from it? (13)
See all 132 later devices cite it directly; ranked here by how many devices descend from each in turn.
Has anything in its family been recalled? (1 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.
- K032331Doro Radiolucent Headrest System and Horseshoe Headrests,and Non-Radiolucent J-Arm Retractor System…Pro-Med Instruments GmbH · 2003 · Cites it directly · ◆ in the 2003 descendants bar of FIG. 13 Class I recalls
What does this lineage say?
- Of its descendants, K032331 (Pro-Med Instruments GmbH, 2003) has gone furthest, with 10 descendants of its own.
How does its category compare?
All GZT devicesGZT Retractor, Self-Retaining, For Neurosurgery: FDA decisions, review times, recalls and adverse event reports over 20 years.
FDA decisions per year · GZT
1in 2022
2026 to Oct 25, outlined.
Median 510(k) review, days · GZT
280in 2017
Receipt to decision; years with fewer than 3 clearances left blank.
Recalls per year · GZT
1in 2012
Class I (1 since 2007) Class II/III not classified
Adverse event reports per year · GZT
1in 2025
MAUDE reports naming product code GZT, 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 | — | 1 | 0 |
| 2008 | 0 | — | 0 | 0 |
| 2009 | 1 | — | 0 | 1 |
| 2010 | 1 | — | 0 | 4 |
| 2011 | 1 | — | 0 | 4 |
| 2012 | 2 | — | 1 (1) | 6 |
| 2013 | 0 | — | 0 | 12 |
| 2014 | 0 | — | 0 | 16 |
| 2015 | 1 | — | 0 | 4 |
| 2016 | 1 | — | 0 | 5 |
| 2017 | 3 | 280 | 0 | 9 |
| 2018 | 1 | — | 0 | 3 |
| 2019 | 0 | — | 0 | 5 |
| 2020 | 1 | — | 0 | 3 |
| 2021 | 1 | — | 0 | 2 |
| 2022 | 1 | — | 0 | 4 |
| 2023 | 0 | — | 0 | 2 |
| 2024 | 0 | — | 0 | 8 |
| 2025 | 0 | — | 0 | 1 |
| 2026 | 1 | — | 0 | — |
https://510kreport.com/device/K913233 · printed Nov 5, 2026
Cite this page
510(k) Report. “K913233: Codman Lhalo Split Ring Retractor System.” Lineage record from FDA 510(k) data and the FDA summary. Updated Nov 3, 2026. Accessed Nov 5, 2026. https://510kreport.com/device/K913233
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Record history
- FDA decision record loaded May 2, 2026
- Lineage and recalls computed Nov 3, 2026
- Page last updated Nov 3, 2026