The hyperthermia pump involved in the incident has not been returned to belmont for investigation, therefore we are unable to confirm that the vacuum regulator intermittently stops functioning.The vacuum regulator is an accessory that can be used along with a hospital supplied vacuum source to allow regulation of the fluid levels of the large reservoir, and allows the user to increase the vacuum supplied to the reservoir and consequently increase return volume from the patient to the reservoir.The manual provides the following instructions: "if the vacuum regulator, ref (b)(4), is used, screw the trap into the regulator then clamp this assembly a few inches above the reservoir holder.Make certain that there is nothing obstructing the air vents at the bottom of the system." without the ability to investigate the unit, a root cause cannot be established.A review of past complaints indicates that this was an isolated incident.The manufacturing and service records for this serial number were reviewed and no anomalies were identified.It was reported that there was no harm to the patient.Belmont will continue to monitor and trend similar reports of this nature.Should additional information become available, a supplemental report will be provided.
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