FDA Devices recall · Reported May 13, 2020
Varian Multileaf Collimator [MLC]; Millenium Multileaf Collimator [52, 80, 120 leaf]; High Definition 120 Multileaf Collimator Model Number(s): product code: H54 and H56; MLC software version 8.5 - Product Usage: is intended to assist the clinician in the delivery of external beam radiation to defined target volumes during radiosurgery and radiotherapy while sparing surrounding normal tissue and critical organs from excess radiation.
After a recent upgrade to the collimator software version 8.5, the firm became aware that the multi-leaf collimator leaves did not move during an arc treatment. The issue is relat…
Varian Medical Systems, Inc. recalled Varian Multileaf Collimator [MLC]; Millenium Multileaf Collimator [52, 80, 120 leaf]; Hig… - a moderate-severity action.
Varian Multileaf Collimator [MLC]; Millenium Multileaf Collimator [52, 80, 120 leaf]; Hig… was recalled by Varian Medical Systems, Inc. in May 13, 2020. Reason: After a recent upgrade to the collimator software version 8.5, the firm became aware that the multi-leaf coll…. Check the official notice for the remedy. Verify recall #Z-1899-2020 with the FDA Devices before acting.
The recall
Varian Medical Systems, Inc. issued this moderate-severity FDA Devices recall-After a recent upgrade to the collimator software version 8.5, the firm became aware that the multi-leaf coll….
- Moderate
- severity level
- 151 units
- affected scope
- Class II
- classification
- May 13, 2020
- reported
Sourced from official FDA Devices enforcement records. Verify recall #Z-1899-2020 with the agency before acting. Full product description, hazard, remedy, and related recalls are below.
Recall Insight
This recall's affected scope, documented in the Recall Profile below, stays within a single-region or limited-distribution footprint. Distribution scope (see Distribution below) directly affects the consumer exposure window and determines whether a recall remains regional or escalates into a nationwide advisory.
Within the same product category the archive holds 6 closely related recalls, 6 from FDA Devices - clustering in a narrow category often points to a systemic quality-control or supplier issue rather than a one-off defect. Always verify the recall number against the official agency record before acting.
Medical Devices recalls over time
Where this recall sits in its category - 41,021 medical devices recalls on record
Of 88,244 recalls with an agency hazard classification, 19,068 are high severity, 64,652 moderate, and 4,524 low. A further 16,179 CPSC/NHTSA recalls have no agency class and are excluded from this split. This recall is classified moderate severity.
Counts reflect market size and reporting activity, not inherent danger, we do not rank products by risk from raw recall volume.
Product description
Varian Multileaf Collimator [MLC]; Millenium Multileaf Collimator [52, 80, 120 leaf]; High Definition 120 Multileaf Collimator Model Number(s): product code: H54 and H56; MLC software version 8.5 - Product Usage: is intended to assist the clinician in the delivery of external beam radiation to defined target volumes during radiosurgery and radiotherapy while sparing surrounding normal tissue and critical organs from excess radiation.
Reason for recall
After a recent upgrade to the collimator software version 8.5, the firm became aware that the multi-leaf collimator leaves did not move during an arc treatment. The issue is related to a transient carriage primary- secondary interlock due to carriage fault on the MLC that immediately preceded the initiation of the arc treatment. The issue will occur only with MLC software version 8.5 and only affects conformal arc treatments, including VMAT and RapidArc. There have been no reports of adverse health consequences due to this issue.
Recall Profile
| Attribute | Value |
|---|---|
| Agency | U.S. Food and Drug Administration |
| Severity class | Moderate (Class II) |
| Status | Terminated |
| Recall number | Z-1899-2020 |
| Date reported | May 13, 2020 |
| Date initiated | August 12, 2019 |
| Recalling firm | Varian Medical Systems, Inc. |
| Firm location | Palo Alto, CA |
| Affected scope | 151 units |
| Distribution | Worldwide distribution - US Nationwide distribution including in the states of TN, FL, IN, PA, NV, WA, DC, CA, AL, IL, MD, VA, TX, MN, AR, GA, OR, MS, MO, NY, SC, DE, AZ, NH, MI, NC, OH, PA and OK. The country of Canada. |
Profile values are sourced directly from the official FDA Devices enforcement record. Source: U.S. Food and Drug Administration.
What to do with this recall
Match your product against the recall record, then act on the agency remedy.
- Check the recall number (Z-1899-2020) and product description against the item you own. Search the archive
- Confirm the current status with FDA Devices before acting, recall details can be updated.
- Follow the documented remedy (refund, replacement, repair, or disposal) rather than general advice. What to do next
This page summarizes the official FDA Devices record for research and awareness; it is not legal, medical, or safety advice. Verify with the issuing agency before acting.
Frequently Asked Questions
What product was recalled? ▼
Why was this product recalled? ▼
Which agency issued this recall? ▼
Where was the recalled product distributed? ▼
Should I stop using a recalled medication or medical device? ▼
Nationwide recalls with similar severity or category timing
Drug and device notices outside this firm and state, matched by severity timing and product category.
Similar severity · nearest report date
Same archive severity grade (Moderate), closest by report date among other firms and states.
Similar Medical Devices · nearest report date
Same product category, closest by report date among other firms and states (deduped against the severity set).
Compare this recall with GORE VIABIL Short Wire Biliary Endoprosthesis, Model No. VS… → · All Medical Devices recalls
Methodology · Corrections · Archive as of August 2026