Stainless steel, portable large animal spontaneous breathing anesthesia machine:
LA and S versions
The stainless steel, portable large animal spontaneous breathing anesthesia machine, due to the high quality of the materials used, is unbreakable, you can either use it at the best surgery theatre or at field anesthesia, just resting it on the ground or on a bale of grass, it can be used both outdoors and inside a stable. It is non ferromagnetic (because of the stainless steel 304) so it can also be used for anesthetics in MRI. It’s easy to transport, easy and quick to assemble in a matter of a few minutes. The circuit pressure can be measured, due to the pressure gauge, which can be placed on the canister lid, which means that this equipment can also be used in long, highly complex surgeries, being able to maintain the desired PEEP (positive end expiratory pressure).
Coming from the vaporizer (not included as part of the equipment), the fresh oxygen with the anesthetic gas enters the cannister by the gas inlet, situated in the upper part, in the inspiratory circuit. Once the patient first inhales, the gas goes through the corrugated tubes, through the unidirectional valve (located at the Y piece), that allows the gas to go directly to the patient. Once the patient exhales, the oxygen/gas mixture left over, and the CO2 resulting from exhalation, goes through the other unidirectional valve (located at the Y piece) that allows the CO2 with the oxygen/gas left over, to go through the corrugated tubes of the exhalation circuit, coming back to the canister, at the lower part of it. Once inside the canister, the CO2/oxygen/gas mixture goes up, through the soda lime, that retains the CO2, so the oxygen/gas mixture returns to the inhalation circuit, at the upper part of the cannister, where it gets mixed with the new fresh oxygen/gas, that is still coming from the vaporizer.
As it is a spontaneous breathing anesthesia machine, the patient breathes by his own. For example, in horses, a normal respiratory rate during anesthesia is between 4 and 8 breaths per minute (bpm).
If the horse breathes less than 4 bpm, or the anesthesiologist considers that the patient needs more ventilation, the equipment has a RESERVOIR/REBREATHING RUBBER BAG attached at the cannister, that can be squeezed by the operator, to ventilate the patient as needed.
During the anesthesia procedure, the circuit pressure begins to rise (as any anesthesia machine does), it can be measured by the pressure gauge (MANOMETER) located in the cannister lid, so the pressure can be relief manually, as needed, using the POP OFF VALVE, located in the exhalation circuit.
A peep valve can be added to the pop off valve as an accessory, so preassure can be automatically relief at a desired value of peep.
