Risks: during patient setup, when patient moves from inferior to superior position, the patient's motion and force against the bowl may cause rotation even when device is locked.Rotation of the bowl during the setup makes the device difficult to use.Clinicians would be required to reposition the patient if movement was detected.If movement was not detected, and confirmation image was not performed, movement could result in serious patient injury due to unintended change in patient setup location.Mitigations: if a setup confirmation image is performed prior to treatment and/or surface guided radiation therapy (sgrt) is utilized during treatment movement may be detected.Movement may also be detected by clinicians through visual confirmation of indexing positions provided on the device.The ifu also provides the following warning statements: "warning: verification image should be taken to confirm patient position prior to treatment." and "warning: ensure device is secure prior to use".Conclusion: based on the risk of unintended movement of the device and the potential for that movement to go undetected by the clinician, a field action is being conducted.Intent to recall (1932738-4/10/19-001) was reported to the fda on 4/15/2019.
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