View source for Medicine:SensorMedics high-frequency oscillatory ventilator

[[File:Oscillator 3100A.jpg|thumb|3100 A Oscillator]]
The '''SensorMedics High-Frequency Oscillatory Ventilator''' is a patented [[Medicine:High-frequency ventilation|high-frequency]] (>150 [[Respiratory rate|R<sub>f</sub>]]) mechanical ventilator designed and manufactured by SensorMedics Corp. of Yorba Linda, California. After a series of acquisitions, Vyaire Medical, Inc. marketed the product as 3100A/B HFOV Ventilators.<ref>{{Cite web|title=3100A/B HFOV Ventilators|url=https://www.vyaire.com/products/3100ab-hfov-ventilators|access-date=2020-07-06|website=Vyaire Medical|language=en}}</ref> Model 3100 (later 3100A) received premarket approval from the United States [[Organization:Food and Drug Administration|Food and Drug Administration]] (FDA) in 1991 for treatment of all forms of [[Medicine:Respiratory failure|respiratory failure]] in neonatal patients.<ref>{{Cite web|title=Premarket Approval (PMA)|url=https://www.accessdata.fda.gov/scripts/cdrh/cfdocs/cfpma/pma.cfm?id=P890057|access-date=2020-07-06|website=www.accessdata.fda.gov}}</ref> In 1995, it received pre-market approved for Pediatric Application with no upper weight limit for treating selected patients failing on conventional ventilation.

==3100A==
The 3100A model is used for infants and children under 35 kilograms (<35&nbsp;kg).<ref name="pmid21037502">{{cite journal |vauthors=Custer JW, Ahmed A, Kaczka DW, Mulreany DG, Hager DN, Simon BA, etal | title=In vitro performance comparison of the Sensormedics 3100A and B high-frequency oscillatory ventilators. | journal= Pediatric Critical Care Medicine | year= 2011 | volume= 12 | issue= 4 | pages= e176–80 | pmid=21037502 | doi=10.1097/PCC.0b013e3181fe3028 | s2cid=205929354 }}</ref>

==3100B==
The 3100B model is used for all other people weighing more than 35 kilograms.<ref name="pmid21037502"/>

==Controls and settings==

===Bias flow===
Adjusting bias flow affects mean P<sub>aw</sub>. Lowering bias flow may decrease the work of breathing and facilitate weaning.
; Typical ranges
*Premature 8–15 LPM
*Near-term 10–20 LPM
*Small child 15–25 LPM
*Large Child 20–30 LPM

===Adjust===
This control sets the mean airway pressure, directly affecting lung volume and oxygenation.

The initial setting is slightly higher than the mean airway pressure for conventional ventilation.

===Power===
Piston displacement is controlled by the power setting. Power changes ventilation and thereby changes blood [[Medicine:Arterial blood gas test|PaCO2]] levels.
; Typical values
Start with a power of 2.0 and adjust for chest wiggle to the umbilicus.

===Inspiratory time %===
'''T<sub>i%</sub>''' is the percentage of time allotted for inspiration. Once this value is set, it rarely needs to be changed.
; Typical values
*33% is recommended by the manufacturer for almost all applications.
*Up to 50% is recommended in situations where lung recruitment is necessary.
* Any Inspiratory Time above 33% can cause air trapping and lead to barotrauma. Setting the Mean airway pressure 1–2&nbsp;cm of h2O above the set MAP for a few minutes, then weaning back down to the original MAP can recruit alveoli safely.

===Frequency===
'''Frequency''' (R<sub>f</sub>) is the number of breaths in one second, expressed in hertz (hz). One hertz is equal to 60 breaths per minute (R<sub>f</sub>) .
;Typical values and ranges
*The smaller the patient, the higher the frequency.
*The larger the patient, the lower the frequency.

; Changes in frequency
*Decrease in frequency = increased [[Biology:Tidal volume|tidal volume]].
*Increase in frequency = decreased tidal volume.

==Problems==
Since neither the 3100A or the 3100B measure actual tidal volumes, it is impossible to wean with precision;<ref name="pmid9308072">{{cite journal|vauthors=Scott CJ, McGeorge AD, Hancock SW | title=Failure of adequate ventilation using Sensormedics 3100A High Frequency Oscillatory Ventilator. | journal=Paediatr Anaesth | year= 1997 | volume= 7 | issue= 5 | pages= 432 | pmid=9308072 }}</ref> as a result, some clinicians find it problematic to use these machines for oscillatory ventilation.<ref name="pmid9308072"/>

==References==
<references/>

[[Category:Respiratory therapy]]
[[Category:Medical equipment]]

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