Aisys CS2 Anesthesia Machines Recalled for O2 Control Flaw: Health Canada

Health Canada has classified a Type II recall affecting the Aisys Carestation Anesthesia System, along with the Aisys CS2 and Aisys CS2 with Et Control machines, after identifying a defect in certain electronic gas mixer assemblies. The notice, published on August 21, 2026, was issued under identification number RA-82521, with the original recall dated August 13, 2026.

The affected equipment is manufactured by Datex-Ohmeda, Inc., based in Madison, Wisconsin, and sold in Canada under the Aisys and Carestation product lines used widely in hospital operating rooms and surgical suites.

What Products Are Being Recalled?

The recall covers two specific main unit models: the Aisys Carestation Anesthesia System-Main Unit, listed under model or catalogue number 1011-9000-000, and the Aisys CS2 Anesthesia Machine Main Unit, listed under model or catalogue number 1011-9050-000. Health Canada’s notice indicates there is no specific lot or serial number tied to the issue, meaning the concern applies broadly to units carrying these model numbers rather than a narrow production batch.

Why Was This Recall Issued?

According to Health Canada, the core problem lies in certain electronic gas mixer assemblies installed inside these anesthesia machines. Under specific conditions, the affected assemblies can cause the device to automatically transition into what the manufacturer calls Alternate O2 Control. In practical terms, this means the anesthesia machine can shift out of its standard oxygen and gas delivery mode without the anticipated triggers a clinician would expect, which raises concerns for consistent, controlled gas delivery during procedures where patients are under anesthesia.

Anesthesia delivery systems are considered high-stakes medical devices precisely because they manage a patient’s oxygen and anesthetic gas mixture in real time during surgery. Any unplanned change in how that mixture is controlled has the potential to complicate a clinical team’s ability to manage a patient’s airway and oxygenation during a procedure, which is why Health Canada moved to formally classify and publish this recall.

Who Should Be Concerned

This recall is directed specifically at the healthcare audience rather than individual consumers. Hospitals, surgical centers, and other clinical facilities in Canada that operate the Aisys Carestation, Aisys CS2, or Aisys CS2 with Et Control anesthesia systems should check their equipment inventory against the listed model numbers. Because no lot or serial number restriction is specified, biomedical engineering and procurement teams should assume that any unit matching the listed catalogue numbers may be subject to the notice.

What Consumers Need to Do Now

Health Canada’s guidance for this recall is direct: facilities and staff who have questions or require additional information about their equipment should contact the manufacturer directly. Datex-Ohmeda, Inc. can be reached through its Madison, Wisconsin headquarters listed in the official recall record. Clinical engineering teams are encouraged to review internal maintenance logs and confirm with the manufacturer whether their specific units require inspection, a software or hardware update, or another corrective step before continued use in active surgical settings.

• Recall class: Type II
• Recall date: August 13, 2026
• Identification number: RA-82521
• Category: Health products – Medical devices – Anaesthesiology

From the Agency

Health Canada describes the issue plainly in its published notice, stating that the Aisys Carestation Anesthesia System, Aisys CS2, and Aisys CS2 with Et Control, containing certain electronic gas mixer assemblies, can automatically transition to Alternate O2 Control. The agency lists the audience for this alert as healthcare professionals and directs any facility with questions to reach out to the manufacturer for further clarification and support.

This recall remains active as of its last update on August 21, 2026. Hospitals and clinics using this equipment are advised to stay alert for any follow-up communication from Datex-Ohmeda or Health Canada regarding corrective actions or updated safety guidance.