The Crossvent-3+ is an intensive care/transport ventilator designed for both adult and pediatric patients. It is a time-cycled, volume or pressure-limited ventilator that provides controlled, assist/control, SIMV (Synchronized Intermittent Mandatory Ventilation), and CPAP (Continuous Positive Airway Pressure) modes.
Function Description:
The ventilator delivers gas (air, oxygen, or a blended mixture) to the patient circuit. An internal pressure regulator maintains a constant output pressure of approximately 20 psi, which is used for both patient gas delivery and pneumatic signals. Gas flows through a pilot valve to an electronically encoded flow valve, which controls the flow rate based on the FLOW control setting. The inspiratory time determines the duration of gas flow, and the tidal volume is calculated by multiplying the on-time by the flow rate.
During inspiration, the exhalation valve is pressurized to the Maximum Pressure level, ensuring gas delivery to the patient. At the end of inspiration, gas flow ceases, and the exhalation valve is connected to the PEEP valve signal, allowing the patient to exhale to PEEP or atmospheric pressure.
The Crossvent-3+ features a low flow flush system to prevent humidity from damaging the pressure transducer. This system uses solenoid valves D1 and D3 to pass a very low flow through the pneumotach tubes during inspiration. Solenoid valve D2 is used to zero the pressure transducer by equalizing pressure across it. During expiration, these solenoids are de-energized, allowing the pressure differential from the pneumotach to be passed to the transducer.
Important Technical Specifications:
- Rate: 5 – 150 bpm
- Inspiratory Time: 0.1 – 5 seconds
- Tidal Volume: 5 – 2500 ml
- Flow Rate: 1 – 120 lpm
- I:E Ratio: 3:1 to 1:99
- Peak Pressure: 0 – 120 cmH2O
- PEEP Pressure: 0 – 35 cmH2O
- Pressure Trigger: -0.2 to -10 cmH2O
- Pressure Support: 0 – 50 cmH2O
- SIMV Rate: 0.6 – 50 bpm
- Sigh: 0 – 2500 ml
- Maximum Safety Pressure: 120 cmH2O
- Pneumatic Power Source: 31 to 75 psi (303.6 – 517.4 kPa)
- Audible Alarm Characteristics: 90 dB at 10cm (25°C)
- Electrical Power Source: 16.0 VDC, 3 A output; short circuit and overload protection.
- Battery Operation: Approximately 6 hours on a fully charged battery.
- Dimensions: Height: 10" (25.4 cm), Width: 11" (28.0 cm), Depth: 5.5" (14 cm)
- Weight: 10.5 lbs. (4.8 kg)
- Operating Temperature: 32° to 104° F (0° to 40° C)
- Storage Temperature: 32° to 122° F (0° to 50° C)
- EU Classification: Internally-powered equipment, continuous operation, BF type applied part, not suitable for AP or APG.
Usage Features:
The Crossvent-3+ features a user-friendly interface with a display and touchscreen keypad. All settings stored in memory are automatically recalled upon power-on.
- Flow Control Knob: Adjusts inspiratory flow from 0-120 lpm.
- Maximum Pressure Knob: Sets the maximum pressure during assisted and controlled inspirations (0-120 cmH2O).
- PEEP Knob: Adjusts PEEP or CPAP level (0-35 cmH2O).
- Audible Alarm & Alarm LED: Indicate alarm conditions and keyboard actuation. The alarm LED provides 360-degree visibility.
- Gas Supply Inlet: Male DISS 9/16-18 fitting for medical grade gas (31-75 psi). An optional air entrainment module allows for 100% or 50% nominal oxygen delivery without compressed air.
- Power On/Off Switch: Controls main power.
- External Electrical Supply Connector: For the factory-supplied power supply (16VDC, 3A).
- Charging LED & Battery: Indicates charging status (slow blinking for rapid charge, rapid blinking for charging system failure/high battery temperature, solid for trickle charge/fully charged).
- Flow Sensor (Pneumotach) Connector: For optional exhaled tidal volume monitoring.
- Oxygen Sensor Connector: For optional oxygen sensor.
- Exhalation Valve Connector: For the exhalation valve.
- Airway Pressure Connector: For the proximal airway tube.
- Patient Gas Connector: For the patient breathing circuit.
- Alarm Reset Switch: Silences alarms.
- Rear of Ventilator: Includes Maximum Pressure Relief Valve (preset at 120 cmH2O) and Negative Pressure Relief Valve (opens at -4 cmH2O).
- Display Interface and Menus:
- Display Overview: Shows selected parameters and allows adjustment via arrow keys.
- Backlight & Pressure Bar Graph: Displays airway pressure and allows backlight adjustment.
- Main Menu: Accesses Assist Control, SIMV, CPAP, Manual, Pressure Trigger, Pressure Support, Rate, SIMV Rate, Backup Rate, Tidal Volume (TV), INSP, I, E, I/E Key, and Flow Key.
- Alarm Menus: Three alarm screens (Alarm 1, Alarm 2, Alarm 3). Alarm 1 monitors Peak Pressure and Rate. Alarm 2 monitors PEEP/CPAP, Mean Pressure, and O2. Alarm 3 displays Low Battery, Low Gas Supply Pressure, and Ventilator Failure.
- Keys Common to All Menus: Lock (locks all keys except ALARM QUIET and MENU keys), Alarm Quiet (silences audible alarms for 60 or 120 seconds), Arrow Keys (scrolls parameters), SIGH (provides a sigh breath in A/C and SIMV modes), Power Source Key (indicates external or battery power), Inspiratory Source Key (displays breath type), Setup Key (accesses setup menu).
Maintenance Features:
- Setup Menu: Allows oxygen sensor calibration, leak test, TV/INSP preference, language selection, and viewing software version and serial number.
- Calibration Menu (CAL): Reserved for service personnel for testing and calibration of components like battery, pressure transducer, flow, touchscreen, keys, display, and valves.
- Cleaning and Sterilization:
- Ventilator: Clean exterior with bactericidal or germicidal agent. Do not steam or gas sterilize, or submerge in liquid.
- LCD Touchscreen Keypad: Clean with isopropyl alcohol; avoid sharp objects.
- Patient Circuit: Disposable, single-use.
- Reusable Circuit (optional): Pasteurization (150°-170°F for 30 min) or Ethylene Oxide (ETO) cold cycle (not exceeding 130°F with adequate aeration).
- Oxygen Tee: Sterilize with EtO (not exceeding 100°F, aerate for 8 hours at 120°F).
- Packing for Shipment: Detailed instructions for safe transport, including cleaning and disinfection, proper wrapping, and carton filling.
- Preventative Maintenance: Recommended schedule includes checking battery condition, performance checks, verifying calibration, cleaning, and replacing the PC Board every 6 years. Gas inlet filter and battery checks are performed periodically. Preventive maintenance parts kits are available.
- Software Upgrades: RS-232 computer interface for software updates. Serial number is required for downloads.
- Pneumatic Calibration: Detailed procedures for calibrating gas source, supply pressure, PEEP valve zero, maximum pressure valve zero, flow valve/potentiometer zero, logic regulator, PEEP signal, maximum pressure signal, DARV signal, flush, positive relief valve, vacuum relief valve, flow (entrainment off/on), and pressure calibration.
- Disassembly & Reassembly Instructions: Step-by-step guides for removing and replacing the rear panel, battery, front bezel, display/touchscreen, populated circuit board (PCB), complete pneumatics, pneumatic valve bracket assembly, flow, max pressure & PEEP valves, solenoids, entrainment on/off switch, and gas input filter.
- Technical Troubleshooting Chart: Provides symptoms, possible causes, and corrective actions for various operational issues.
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