Severity
Moderate
ModerateClass IITerminated
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…
Compiled from official public sources by the editorial team.
Verify with FDA Devices →
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 FDA Devices action (record #Z-1899-2020) was formally reported on May 13, 2020, with the manufacturer initiating the action on August 12, 2019. It is classified under Moderate severity (Class II), with a current status of Terminated. Varian Medical Systems, Inc. is listed as the recalling firm, operating out of Palo Alto, CA. Federal records list the affected scope as 151 units.
The documented reason for this recall is: 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- seco… Distribution data in the federal record shows the product reached: 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.. Distribution scope 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, 3 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 - 40,322 medical devices recalls on record
Of 101,704 recalls in the database, 24,878 are high severity, 72,426 moderate, and 4,400 low. 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.
Affected scope
151 units
Related Recalls
6
3 from same agency
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? ▼
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.. Recalled by Varian Medical Systems, Inc.. Units affected: 151 units.
Why was this product recalled? ▼
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.
Which agency issued this recall? ▼
This recall was issued by the FDA Devices on May 13, 2020. Severity: Moderate. Recall number: Z-1899-2020.
Where was the recalled product distributed? ▼
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..
How do I check if my product is affected by a recall? ▼
Check the product description and recall number (Z-1899-2020) against your product. Visit the official FDA Devices website for the most current information. You can also use our Recall Checker tool to search by product name or brand.
Should I stop using a recalled medication or medical device? ▼
Do not stop using a recalled medication or device without consulting your healthcare provider first, as abruptly discontinuing treatment could pose its own health risks. Your doctor can advise on alternatives or whether the recall applies to your specific product lot. Check the recall number and lot information against your product packaging.
Nearby Recalls in This Category
Other recalls in the same product category, useful for spotting patterns across the same defect class or manufacturer.
CPSC Moderate
Rowenta Recalls Cordless Vacuum Cleaners Due to Risk of Serious Injury from Fire and Burn Hazards
· 2026-07-02
CPSC Moderate
Daikin Comfort Technologies Manufacturing Recalls Amana Air Conditioners and Heat Pumps Due to Risk of Serious Injury f…
· 2026-06-25
CPSC Moderate
Arizer Solo III Portable Vaporizers Recalled Due to Fire and Burn Hazards; Risk of Serious Injury or Death; Imported by…
· 2026-06-18
FDA Devices Moderate
GE HealthCare TRADE IN CARESCAPE TELEMETRY SERVER ARK-2250L - NORTH AMERICA, REF #5697603-902, Product Code KSA; used i…
GE Medical Systems Information Technologies Inc · 2026-06-03
FDA Devices Critical
Medline kits containing Huons Co. Bupivacaine HCL in Dextrose Injection, USP, labeled as: 1) BLOCK TRAY, Medline Kit…
Medline Industries, LP · 2026-06-03
Compare this recall with Rowenta Recalls Cordless Vacuum Cleaners Due to Risk of Ser… →
Every figure on PlainRecalls is rendered directly from official FDA, CPSC and NHTSA recall records, no number is typed in by an editor. This recall: FDA Devices, reported May 13, 2020. Severity classes follow each agency's own taxonomy (FDA Class I/II/III; CPSC and NHTSA by hazard type), and related-recall context is computed across the full archive. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of July 2026.