Technical Documentation
102 Pages
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Technical Documentation Savina Intensive Care Ventilator
Revision 10.0 5664.900 9036060
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Contents General 1
Symbols and Definitions
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2
Notes
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Function Description 1
General 10 1.1 Functional principle ... 10 1.2 Monitoring ... 10 1.3 Block diagrams ... 12
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Principal components 14 2.1 Electronics ... 15 2.2 Control panel with black/white display ... 19 2.3 Control panel with TFT display ... 20 2.4 Pneumatic assembly ... 23
Maintenance Procedures 1
General notes
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2
Replacing the microfilter
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3
Replacing the dust filter set
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Replacing the O2 sensors
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Replacing the filter in the O2 inlet
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Replacing the lead-gel battery (internal battery)
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Schematics and Diagrams 1
Front view, Savina
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Rear view, Savina
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Identification of PCBs 53 3.1 O2 Valve PCB ... 53 3.2 Control PCB ... 55 3.3 Front Panel PCB ... 56 3.4 O2 Diaphragm PCB ... 57
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Pneumatic diagrams
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Tubing diagram
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Annex Parts catalog Test instructions (TL)
Copyright reserved.
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Technical Information
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Contents
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Copyright reserved.
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General
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General 1
Symbols and Definitions
Savina
WARNING A WARNING statement provides important information about a potentially hazardous situation which, if not avoided, could result in death or serious injury.
CAUTION A CAUTION statement provides important information about a potentially hazardous situation which, if not avoided, may result in minor or moderate injury to the user or patient or in damage to the equipment or other property.
NOTE A NOTE provides additional information intended to avoid inconvenience during operation or servicing of the equipment.
Definitions:
2
Notes
Inspection
= examination of actual condition
Maintenance
= measures to maintain specified condition
Repair
= measures to restore specified condition
Servicing
= inspection, maintenance, and repair
This Technical Documentation conforms to the IEC 60601-1 standard. Read each step in every procedure thoroughly before beginning any test. Always use the proper tools and specified test equipment. CAUTION If you deviate from the instructions and/or recommendations in this Technical Documentation, the equipment may operate improperly or unsafely, or the equipment could be damaged.
The maintenance procedures described in this Technical Documentation may be performed by properly trained service personnel only. These maintenance procedures do not replace inspections and servicing by the manufacturer. This Technical Documentation is for informational purposes only. Product information contained in this Technical Documentation does not supersede Product information provided in the Instructions for Use enclosed with the product at the time of delivery.
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CAUTION Dräger recommends that only Dräger supplied repair parts be used for maintenance. Otherwise the correct functioning of the device may be compromised.
Savina
General
NOTE Unless otherwise stated, reference is made to laws, regulations or standards (as amended) applicable in the Federal Republic of Germany for equipment used or serviced in Germany. Users or technicians in all other countries must verify compliance with local laws or applicable international standards.
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NOTE If the test values are not met, please contact your local service organization.
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General
Savina
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Function Description
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Function description General
The Savina is a long-term ventilator unit designed for patients with a tidal volume of 50 mL and above, and for the following applications: –
Intensive care unit
–
Recovery room,
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Secondary transportation from hospital to hospital,
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Patient transfer within the hospital,
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Transfer flights.
1.1
Functional principle
The Savina generates the compressed air for ventilation with a blower, which means the Savina is able to ventilate without any connection of compressed air or oxygen. A controllable valve is switched in parallel with the blower to regulate the pre-set ventilation parameters. The valve opens or closes according to the pre-set ventilation parameters. To increase the oxygen concentration in the ventilatory gas, an oxygen concentrator, e.g. a Permox SilentCare, can be connected. If compressed oxygen is connected to the Savina, the oxygen concentration of the ventilating gas can be precisely metered. The oxygen concentration is then metered internally with sensors, the associated electronics, and a bank of valves.
1.2
Monitoring
The Savina has the following monitoring system:
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Measured values
Additional information
Measurement of the airway pressure (Paw)
Pressure curve is pT1-filtered. (T1 = 100 ms) The bargraph is additionally smoothed.
Measurement of insp. and exp. flow
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Measurement of peak flow (FlowPeak)
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Measurement of the inspiratory O2 concentration (FiO2)
PT1-filtered T1 = 2 s
Measurement of airway peak pressure (Ppeak)
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Measurement of plateau pressure (Pplat)
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Measurement of airway mean pressure (Pmean)
---.
Measurement of the positive endexpiratory pressure (PEEP)
---
Measurement of the expiratory volume (Vte)
Using the phase information from the ventilation control, the measured value is determined over one mandatory breath.
Measurement of the expiratory minute volume (MV)
Determined over 1 minute and filtered.
Measurement of the spontaneous minute volume (MVspon)
Determined over 1 minute and filtered.
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Savina
Savina
Function description
Measurement of the total frequency (Ftot)
Determined over 1 minute and filtered.
Measurement of the spontaneous frequency (Fspn)
Determined over 1 minute and filtered.
Measurement of the inspiratory-expi- Using the phase information from ratory ratio (I:E). the ventilation control, the inspiratory time Tinsp and the expiratory time Texp of one respiratory cycle are determined. They are used to calculate I:E = Tinsp/Texp. The measured I:E-ratio is available as output value until the next inspiration is completed. A measurement is not carried out when an ASB breath changes into to a mandatory breath. The output values become invalid when the measurement is inactive, when a new value has not been determined for 15 s, or when more than 45 s have elapsed since the start of inspiration. Measurement of the plateau time (Tplat) Measurement of the inspiratory time (Tinsp)
Using the phase information from the ventilation control, the inspiratory time Tinsp and the plateau time Tplat are determined. The measured times are available as output values until the next inspiration is completed. A measurement is not carried out when an ASB breath changes into to a mandatory breath.
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The output values become invalid when the measurement is inactive or when no new values have been determined for 15 seconds. Measurement of the airway resistance (R)
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Measurement of the compliance (C)
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Measurement of the temperature at the Y-piece (Temp.)
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Only if optional NIV is enabled
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Function description
Savina
Leakage volume in percent (MVleak) The patient flow and the patient flow clamped towards zero are totalized in two flow totalizers and their average is determined over 400 ms. These average values are filtered using a Bessel filter of the fourth order each and are then used as values for the leakage volume MVleak and the inspiratory minute volume MVinsp. This results in the MVleak readout according to: MVleak [%] = 100% * MVleak / MVinsp. Patient volume (VTpat)
---
Alarm limits / monitoring Apnea detection is adjustable (monitoring can be switched off in NIV). Detection of dead space-intensive spontaneous breathing (tachypnea monitoring). Airway pressure monitoring adjustable. Monitoring of minimum and maximum minute volumes is adjustable. Monitoring of maximum tidal volume is adjustable (monitoring can be switched off in NIV). The minimum and maximum limits for FiO2 are adjustable in (optional) LPO mode. A disconnection time, by which the “!!! Airway pressure low” warning is additionally delayed, is only adjustable in NIV.
Block diagrams
Below are descriptions of the block diagrams “Savina with black/white display (b/w display)” and “Savina with TFT display”.
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1.3
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Savina 1.3.1
Savina with black/white display (b/w display)
Block diagram of the electronics with control panel (black/white display)
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Fig. 1
Function description
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Function description
Fig. 2
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Savina with TFT display
Block diagram of the electronics with control panel (TFT display)
Principal components
The Savina consists of the electronics, the control panel, and the pneumatic assembly, containing the following principal components: Electronics
Control panel
Pneumatic assembly
Power supply unit
Display:
Plug-in unit
Control panel with black/white display Control panel with TFT display
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Control PCB
Valve block
Motor Commutation PCB
Inspiratory block
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1.3.2
Savina
Savina
Function description
2.1
Electronics
2.1.1
Power supply unit
O2 Valve PCB
Pressure measuring unit
O2 Diaphragm PCB
Patient system
Fan
Flow sensors
The power supply unit delivers the supply voltages for the Savina. The input voltage range of the power supply unit is 100 V to 240 V AC and 50 Hz to 60 Hz. However, the power supply unit can also be operated with an external rechargeable battery (12 V or 24 V) or with an external on-board - ambulance/helicopter - power supply (10.5 V to 36 V). The connection for the alternating voltage is made by a power cable. The connection for the external rechargeable battery or the external on-board power supply is made by a coded plug. The power supply unit actuates the three “Mains power”, “External battery or on-board power supply” and “Internal battery” LEDs. The LEDs are mounted on the membrane keypad of the control panel, and indicate the current operating status. The Savina includes 2 internal rechargeable batteries (2 x 12 V) which enable uninterrupted operation in the event of a complete failure of external power. The internal rechargeable batteries supply the O2 sensors with power, even when the Savina is switched off. As a result, valid O2 values are available immediately on power-up. The power supply unit supplies the following output voltages: –
+5 V
–
-15 V
–
+15 V
–
+24 V
–
+48 V
The output voltages are short-circuit-proof and stable at no-load. The output voltages are generated according to the following priority, dependent on the input voltages:
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Input voltage
Priority
Action
AC voltage
1
Charge external and internal batteries, and maintain the charge.
External on-board power supply
2
Charge internal batteries, and maintain the charge.
External battery/batteries
3
Charge internal batteries, and maintain the charge.
Internal batteries
4
The fan cools the power supply unit. The heated air removes excess oxygen from the control panel and warms the patient system.
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Function description 2.1.2
Control PCB
Savina The Control PCB is the central “control and monitoring unit” of the Savina. It includes two separate processor systems, the master and front processors. The program memories are flash EPROMs. The flash EPROMs can be programmed with a laptop connected to the serial port of the Savina (software download). An EEPROM is provided for each processor system for storage of changeable, non-volatile data. The EEPROM of the master stores the calibration data of the sensors, fan, etc. The EEPROM of the front processor stores safety parameters, settings such as contrast, sound volume, etc., as well as a “backup copy” of the operating hours. The EEPROM of the front processor is plugged in and, if the board needs to be replaced, must be mounted on the new board. The board is provided with a real-time clock which is used to display the time and to store the software options, the unit identification and the operating hours. The real-time clock is buffered by a battery which is integrated in the real-time clock. The real-time clock also holds the logbook. The real-time clock is plugged in and, if the board needs to be replaced, must be mounted on the new board. The Control PCB contains the following functions: Processing of the signals from the sensors (O2, flow, pressure, temperature),
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Control of the blower and valves,
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Monitoring of the unit functions and the supply voltages,
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Actuation of the displays,
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Keypad interpretation,
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Provision of the internal and external interfaces.
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Fig. 3
2.1.3
Function description
Control PCB block diagram
Motor Commutation PCB
The Motor Commutation PCB controls the motor of the blower. The entire control functionality is located in a self-contained housing. The supply voltage is +48 V, and is delivered by the power supply unit. The +48V on the Motor Commutation PCB are protected with a fuse (6.3AT). The input voltage range of the Motor Commutation PCB is 12 to 52.5 V. The rotation speed is set by the Control PCB. The control voltage for the rotation speed is 0 to +5.00 V, corresponding to a rotation speed of 0 to 12,000 rpm. The rotation speed range is 4000 to 12,000 rpm.
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The Motor Commutation PCB delivers the “actual rotation speed signal” to the Control PCB. The “actual value signal” is 6 pulses per rotation. In the event of discrepancies in the rotation speed the Control PCB adjusts the speed according to the deviation.
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Function description
Savina
Fig. 4
2.1.4
O2 Valve PCB
Block diagram of the Motor Commutation PCB
The O2 Valve PCB holds the pressure sensors (2x absolute pressure S6 and S7, 1x O2 supply pressure S5), the actuator for the O2 calibrating valve and the nebulizer valve, and the actuator for the valve bank. The signals from the pressure sensors are amplified and passed to the Control PCB. The +5 V voltage supply to the pressure sensors is generated on the O2 Valve PCB. The valves in the valve bank, the O2 calibrating valve and the nebulizer valve can be operated individually by an electronic switch. They are actuated by the Control PCB.
2.1.5
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O2 Diaphragm PCB
Block diagram of the O2 Valve PCB
The O2 Diaphragm PCB amplifies the signals from the O2 sensors and measures the temperature of the O2 sensors and of the respiratory gas in the inspiration block. The temperature of the O2 sensors is required to compensate for the temperature-sensitive O2 measurements. The calibration data from the sensors are stored on the Control PCB in an EEPROM. The reference voltage of the O2 sensors is generated from the voltage of the rechargeable batteries, and so is also available when the unit is switched off.
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Fig. 5
Savina
Function description The operating voltages of the O2 Diaphragm PCB are +5 V and +15 V.
Fig. 6
2.1.6
Fan
Block diagram of the O2 Diaphragm PCB
The fan takes in ambient air through the cooler of the blower and cools the blower. The air flow also removes excessive oxygen from the device. The voltage supply to the fan is +24V. The rotation speed of the fan is controlled by the Control PCB.
Fig. 7
Control panel with black/white display
2.2.1
Control panel
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2.2
The control panel is the interface between the unit and the user. The ventilation parameters are entered via the control panel and displayed on the black/white display (b/w display).
Fig. 8
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Fan control
Block diagram of the control panel with black/white display
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Function description 2.2.2
Front Panel PCB
Savina The Front Panel PCB contains the 7-segment displays for the pre-set ventilation parameters, the drivers for the key LEDs, the drivers for interpretation of the keys and the shaft encoder, and the voltage generator for backlighting of the black/white display. The voltage generation for the backlighting can be switched on and off from the Control PCB.
Fig. 9
Block diagram of the Front Panel PCB
2.2.3
Membrane keypad
The membrane keypad features the control keys and the associated LEDs.
2.2.4
Black/white display (b/w display)
The black/white display (b/w display) displays the patient parameters and the warning messages. The black/white display is actuated by the Control PCB; the black/white display backlighting is actuated by the Front Panel PCB. The resolution of the black/white display is 240x128 pixels. The voltage supply is +5 V and -15 V.
2.2.5
Rotary knob
The rotary knob is used to set and acknowledge the ventilation parameters. The rotary knob transmits square signals to the Front Panel PCB as it rotates, and the signals are then evaluated by the Control PCB. The voltage supply is +5 V.
2.3
Control panel with TFT display
2.3.1
Control panel
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The control panel is the interface between the unit and the user. It is used to enter and display the ventilation parameters.
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