Table 1 The differences in the compositions and configurations of the anesthesia machines; Primus®, Perseus®, and Zeus® [12, 13, 15]
Primus® | Perseus® | Zeus® | |
|---|---|---|---|
Mode of anesthesia | Fresh gas mode | Fresh gas mode | Fresh gas mode (Zeus®-F) Auto-mode (Zeus®-A) |
Type of ventilator | Piston | Blower-driven | Blower-driven |
Internal volume of anesthesia machine | 4.7 L | 2.1 L | 2.0 L |
Position of the fresh gas inlet (the rank for proximity to patient) | Between ventilator and absorber (2nd) | In front of ventilator and absorber (1st) | Next to ventilator and absorber (3rd) |
Presence of a decoupling system | Yes | No | No |
Type of vaporizer | Bypass | Bypass | DIVA |
Operation mode of vaporizer | Out-of-circle | Out-of-circle | Out-of-circle (Zeus®-F) In-circle (Zeus®-A) |
Existence of TCA with a feedback control system | No | No | Yes |