Precision Medical Conserving Flowmeter - Manual (Page 5)

4
PRINCIPLES OF OPERATION
The Precision Medical, Inc. EasyPulseFlow is a combination of two (2)
devices, a traditional Thorpe tube flowmeter and a pulse oxygen conserver.
The EasyPulseFlow is designed to be used with low pressure oxygen
systems at specified Inlet Pressure. It consists of a back pressure
compensated Thorpe tube flowmeter, a conserving module, and a selector
dial to choose between Continuous Flow mode or Pulse mode.
In the Continuous Flow mode the flowmeter operates similar to a traditional
Thorpe tube flowmeter: the flow is determined by setting the flow control
knob to the prescribed flow. In this mode it is capable of delivering metered
flows from 0 to 15 l/min and up to 24 l/min at flush flow.
In the Pulse mode the device operates as an oxygen conserver. Settings
of 1 through 5 are available and supply a similar F
IO
2
to the patient as
continuous flow. The conserving module controls the pulse size and
timing to the patient. It supplies a pulse of oxygen at the beginning of
each breath. This reduces the oxygen demand on the system and limits
the drying of the airways. The oxygen is supplied to the patient through
the nasal cannula.
SPECIFICATIONS
Inlet Pressure Range: 19MFA: 50 psi (3.4 bar)
19MFA AU: 4 bar (58.0 psi)
19MFA C I : 5 bar (72.5 psi)
Pulse Settings: 1, 2, 3, 4 and 5
(similar F
IO
2
to continuous flow value)
Continuous Flow Range: 0-15 l/min metered
(20-24 l/min max flush flow)
Pulse Accuracy: Within ±15% of the nominal bolus
value (at each breath rate)
Continuous Flow Accuracy: ±0.25 l/min from 0.5 l/min up to 5 l/min
±0.5 l/min from 5 l/min up to 15 l/min
Savings Ratio: Up to 5.7:1
Trigger Method: Negative inspiratory effort from patient
inhalation