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ANESTHETIC EQUIPMENT

Veterinary medicine use of anesthetic equipment, vet tech, VT250, o2 flow

QuestionAnswer
PURPOSES OF THE ANESTHETIC MACHINES  Provide oxygen (machine system)  Deliver precise amounts of anesthetic agent (machine system)  Remove CO2 (breathing system)  Provide assisted or controlled ventilation (breathing system) to the patient
BASIC COMPONENTS OF THE ANESTHETIC MACHINE Gas source- compressed oxygen Pressure regulator (pressure reducing valves) Flowmeter Vaporizer Patient breathing circuit Waste Gas Scavenger systems
Gas source- compressed oxygen  Provides for the oxygen requirements of the patient and acts as a carrier gas for the inhalation anesthetic agent.  Oxygen is stored as a compressed gas held under pressure in metal cylinders.
O2 Cylinders General Info Cylinder sizes are designated according to letters-size ‘A’ being the smallest; size ‘E’ (E-tank) is more commonly used. H-tanks are also used at HSVMA-RAVS clinics, usually with a manifold that allows multiple machines to operate off the same tank.
O2 Cylinders color Green
Handle pressurized cylinders with respect Dropping or knocking cylinders can damage them and result in their acting as a "missile", causing serious personnel or structural damage.  Secure cylinders at all times with racks or lay them on their sides to prevent tipping or falling.
All pressure tanks have a stem with a valve that allows the flow of oxygen to be turned on or off. You should know where these valves are located. E-tanks take a special key or wrench to operate the valve. H-tanks have a handle permanently attached to the valve stem.
Pressure regulator (pressure reducing valves) Regulator also provides for constant flow as the pressure in the tank decreases. As oxygen moves from the high-pressure tank (at up to 2200 psi) into the anesthetic machine, the pressure is lowered by a regulator to provide a safe operating pressure (45-50 psi).
Flowmeter From the cylinder, oxygen travels through a low-pressure hose to the flowmeter.  can then measure o2 to patient in L/min).  Oxygen enters the flowmeter and is delivered to the vaporizer at a constant rate as indicated on the flowmeter dial.
Vaporizer Oxygen exits the top of the flowmeter and continues via a low-pressure hose to the vaporizer.  The vaporizer is designed to convert liquid anesthetic to vapor and to add a controlled amount of vapor to the carrier gas flowing through the machine.
o2 off- vaporizer If the oxygen flow is turned off, no anesthetic is delivered to the patient.
vaporizer full? An indicator window at the base of the vaporizer indicates the amount of liquid anesthetic remaining. This should be checked before the machine is used and refilled if the level is below the half-way mark.
vaporizer facts All of the machines are out-of-circuit precision vaporizers.Allows delivery of a precise amount of anesthetic vapor to the breathing circuit. The dial of the vaporizer is in in percent concentrations.
vaporizer tube  A tube running from the “outlet” side of the vaporizer attaches to the breathing circuit and is called the “common gas outlet”.
Patient breathing circuit Delivers oxygen and anesthetic and removes carbon dioxide produced by patient  Provides method for assisting or controlling ventilation
patient breathing size differentiation Rebreathing or circle system-used for patients over 15 lbs (7kg)body weight.  Non-rebreathing system- used for patients under 15 lbs (7 kg)as a rule of thumb.
Waste Gas Scavenger systems Eliminate excess anesthetic gases to minimize breathing by personnel
Waste Gas Scavenger attachment In the field we use a passive scavenging system, which consists of an activated charcoal (FAir ® ) canister attached to the scavenging or exhalation hose  With a non-rebreathing system, the canister is attached to the exhalation tubing.
Waste Gas Scavenger parts As part of a circle (rebreathing) circuit, the canister is attached to a scavenging hose that is usually part of the 'pop-off' valve. The holes at the bottom of the canister must be left uncovered to allow filtered air to escape.
When should you change the f-Air canister? The F-Air® canister must be changed after 8 hrs of normal use or a weight gain of 50 grams
data from "http://www.ruralareavet.org/PDF/Anesthesia-Anesthesia_Machine.pdf"
Created by: calleenO