Bear Cub 750PSV Revision History Date Revision Pages Changes June 2003 Release June 2004 Release manual in VIASYS Healthcare template using VIASYS Healthcare Critical Care nomenclature. L2346 Revision B June 2004...
Service Manual Contact and Ordering Information United States, Latin America, Asia Pacific: Sales, Service and Clinical Support: VIASYS Healthcare Critical Care Division 22705 Savi Ranch Parkway Yorba Linda, CA 92887 Phone: (714) 283-8444 (800) 381-3552 Fax: (714) 283-8493 www.VIASYShc.com United Kingdom:...
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Federal law (USA) restricts this device to sale by or on the order of a physician. CAUTION Not suitable for use in the presence of flammable anesthetics. CAUTION Service and/or repair of this instrument is restricted to VIASYS Healthcare authorized or VIASYS Healthcare Trained Personnel only. L2346 Revision B...
Service Manual Warranty The Bear Cub 750PSV is warranted to be free from defects in material and workmanship and to meet the published specifications for One (1) year from date of shipminent. The liability of VIASYS Healthcare, Critical Care Division, (referred to as the...
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Bear Cub 750PSV L2346 Revision B June 2004...
Service Manual Contents Revision History ..................2 Contact and Ordering Information ................3 Warranty ......................... 5 Limitation of Liabilities....................5 Contents ......................... 7 List of Figures ........................ 9 List of Tables........................ 11 Chapter 1: Specifications ..............13 Modes..........................13 Controls ........................13 Alarms...........................
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Bear Cub 750PSV Chapter 3 OVP Recommended Service ........... 29 Operational Verification ....................29 Equipment Required....................29 Test Procedures......................32 Exterior Inspection and Cleaning................34 Exterior Cleaning ......................34 Plugs and Cables ......................34 OVP Checklist ......................35 Verification Steps......................35 Chapter 4 Calibration (for software releases 2 and 3 only)...
Service Manual Chapter 1: Specifications Modes In the Assist/Control position, a mechanical breath is delivered with each inspiratory effort, provided the patient satisfies the assist sensitivity criteria. If the patient does not meet the assist sensitivity criteria, the ventilator automaticallydelivers breaths according to the Ventilator Rate control.
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Bear Cub 750PSV Inspiratory Time Range: 0.10 to 3.0 seconds Resolution: 0.01 from 0.10 to 0.50 seconds 0.02 from 0.50 to 1.70 seconds 0.05 from 1.70 to 3.00 seconds Accuracy: ± 0.02 seconds from 0.10 to 0.50 seconds ± 0.025 seconds from 0.50 to 3.00 seconds...
Service Manual Inspiratory Pressure Range: 0 to 72 cmH2O Resolution: 1 cmH2O from 0 to 30 cmH2O 2 cmH2O from 30 to 72 cmH2O Repeatability: ± 1 cmH2O or ± 5% whichever is greater. Breath to breath Manual Breath Range: Assist Sensitivity Range: 0.2 to 5.0 L/min...
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Bear Cub 750PSV Low Inspiratory Pressure Range: 1 to 65 cmH2O Patient Circuit LED On/Off Failed to Cycle LEd On/Off Low Gas Supply LED On/Off Apnea LED On/Off Settings Incompatible LED On/Off Pressure Settings Incompatible LED On/Off Prolonged Inspiratory Pressure...
Service Manual Line Power Green/Red LED Monitors Total Breath Rate Range: 0 to 255 BPM Resolution: 1 BPM from 0 to 100 BPM 2 BPM from 100 to 150 BPM 3 BPM from 150 to 255 BPM Exhalation Minute Volume Range: 0 to 30.0 L/min resolution:...
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Bear Cub 750PSV Expiratory Time Range: 0 to 99.9 seconds Resolution: 0.01 seconds from 0 to 99.9 seconds 0.10 seconds from 10.0 to 99.9 seconds Accuracy: ± 0.02 seconds I:E Ratio Range: 9.9:1 to 1:9.9 Accuracy: ± 0.1 or ± 20 mseconds, whichever is greater...
Service Manual Breath Type (Patient Initiated) Test Push Button Battery LED On/Off Preset Values Minimum Expiratory Time 150 milliseconds Maximum Inspiratory Time 3.10 seconds Maximum settable I:E Ratio Model 9300 Classification Class 1 Degree of Protection Electric Shock Type B Harmful Ingress of Water None (Ordinary Equipment) Degree of Safety of Application...
Service Manual Ventilator Dimensions 13.5" W x 10" D x 11" H Graphics Display Dimensions 13" W x 2.5" D x 9.5" H Pedestal Stand Dimensions 24" x 40.5" H Compressor Dimensions 22"W x 21.5"D x 36" H Shipping Weight Including Ventilator 38 lbs.
Bear Cub 750PSV Cleaning External Surfaces All external surfaces of the ventilator shall be able to be wiped clean with the following compounds: Isopropyl Alcohol Chlorine Compounds Maximum Concentration: 1:10 Quaternary Ammonium Compounds Maximum Concentration: 1:500 NOTE These compounds are diluted by volume in water.
Service Manual Chapter 2: Theory of Operation Overview This chapter describes the operating theory of the BEAR CUB™ 750PSV Infant Ventilator. The BEAR CUB™ 750PSV ventilator can be classified as a micro- processor controlled, time cycled, pressure limited, dual flow, neonatal/pediatric critical care ventilator.
Service Manual Ventilator pneumatics - General description Figure 2-2 shows the schematic diagram of the BEAR CUB™ 750PSV Pneumatics System. The pneumatics interface to the electronics is achieved using various actuators (solenoids) and transducers. The Pneumatics System consists of eight (8) main subsystems: Gas Inlet and Conditioning, Oxygen Blender System, Flow Control, Sub-Ambient/Overpressure Relief system, Exhalation Valve/Pressure Control, Pressure Monitoring, the Proximal Airway Purge System, and the Auxiliary...
Bear Cub 750PSV NOTE The Inspiratory Flow and Base Flow displayed on the Front Panel are independent of the flow readings taken by the flow sensor. AOPR Valve/Sub-Ambient Valve/ Dump Solenoid Maximum pressure to the patient can be limited using the Adjustable/Over Pressure Relief valve.
Service Manual Exhalation Valve The Exhalation Valve regulates flow out of the patient circuit. Exhaled patient gases flow through the expiratory leg of the patient circuit, past the Exhalation Valve diaphragm and seat, and out to the atmosphere. The Exhalation Valve is a pneumatic servo controlled regulator.
Bear Cub 750PSV The Display circuit board is the user interface for the ventilator electronics. Ventilator controls and alarms are set by the clinician, and Monitors feed current ventilator status back to the display. The Control circuit board includes the Monitor MCU and Control MCU. The Control board drives the system solenoids which control breath phase, flow, and pressure.
P/N 50000-01147 Oxygen Analyzer Rubber Stopper Stop Watch CAUTION If any of the following procedures fail to producer the results as outlined in this document, disconnect the ventilator and contact your authorized VIASYS Healthcare service technician. L2346 Revision B June 2004...
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Service Manual WARNINGS The following warnings must be read and understood before performing the procedures described in this chapter. • Under no circumstances should this medical device be operated in the presence of flammable anesthetics or other volatile materials due to a possible explosion hazard.
Bear Cub 750PSV correct values. This certification procedure should be performed at least once every six months. More frequent certification may be required based on usage and environment. Test Procedures Set up the ventilator with a standard infant test circuit. Plug the end of circuit with rubber stopper.
Low Inspiratory Pressure alarms are activated. Verify that the Alarm Loudness can be varied from minimum to maximum, but the alarm cannot be turned off. Figure 3-1: Bear Cub 750PSV US with Patient Circuit L2346 Revision B June 2004...
Bear Cub 750PSV Exterior Inspection and Cleaning Inspect all cords, connectors, and fittings. Inspect the case for any cracks or other damage. Exterior Cleaning Before any cleaning of the ventilator, disconnect WALL AC. Clean the exterior of the ventilator with an appropriate bactericidal or germicidal agent.
Do not release the ventilator for use if it does not pass all of the verification procedures specified in the checklist. To do so could result in personal injury including death or property damage. Refer the ventilator to a VIASYS trained service technician for appropriate repair and/or calibration.
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Bear Cub 750PSV L2346 Revision B June 2004...
Service Manual Chapter 4 Calibration (for software releases 2 and 3 only) Introduction The information in this chapter is intended for use by a factory trained service technician. Before opening the console or removing assemblies to perform calibration, a reference should be made to the Operators Manual and all chapters of this Service Manual to ensure that the ventilator is being properly utilized.
NOTE If problems are incurred in obtaining the calibration performance, refer to Troubleshooting (Chapter 6) or contact your dealer or VIASYS Healthcare Service Facility. Pressure Transducers and Flow Control Valve Calibration Turn OFF the ventilator and disconnect tubing to the Pressure Transducers on the Control PCB.
Service Manual PATIENT port. To calibrate the Flow Control Valve, press the TEST key to advance the calibration number; then set flow as specified and press the MANUAL BREATH key to record data. Calibrate Base Flow, then Calibrate Inspiratory Flow. Table 4-2: Calibration Transducer Calibration Number...
Bear Cub 750PSV Table 4-5: Regulator Balance Blender Component Requirement Setting Air Regulator 100% 17.0 ± 1 psig Adjust O regulator to obtain a Regulator pressure balance with the air regulator within 2 cmH With Base Flow Control Valve set to minimum, Bleed Valve Bleed Valve exhaust shall equal 3.5 - 5.5...
Bear Cub 750PSV Table 6-2: Troubleshooting Symptom Possible Causes Corrective Action Failed To Cycle 1. Air and Oxygen 1. Verify Inlet Air and O Pressure Alarm Pressure Have Entering The Ventilator. Verify Decreased Below 24 ± 2 Calibration of Air and Pressure PSIG.
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Service Manual Symptom Possible Causes Corrective Action Regulator(S) Defective. Regulator. 3. Defective Oxygen 3. Replace Oxygen Blender. Blender. 4. Replace Defective Check Valve. 4. Defective Cross-Over Check Valve. Front Panel 1. Defective Front Panel 1. Remove and Replace Display PCB. Control(S) Will Not Potentiometer(S).
Service Manual Chapter 7 Removal & Replacement WARNINGS • Disconnect all electrical power, air, and oxygen sources before attempting any disassembly. Failure to do so could result in injury to the service technician or damage to equipment. • After replacement of any assembly(ies), always repeat the Operational Verification Procedure (refer to chapter 3), then allow a "burn-in"...
Bear Cub 750PSV Figure 7-2: Standoff Tube Removal The front portion of the unit will drop forward, stopping when the end of the retaining cord is reached. See Figure 7-3. Figure 7-3: Opening of Front Portion Flow Valve Assembly Removal Disconnect hoses and connectors to the assembly.
Service Manual Figure 7-4: Flow Valve Assembly Control PCB Removal Disconnect all hoses and connectors from the board. Remove screw shown in Figure 7-5. Lift board carefully from four retainer points. Remove board from unit. To install, reverse removal procedure. Figure 7-5: Control PCB L2346 Revision B...
Bear Cub 750PSV Display PCB Removal Remove control PCB . See Control PCB Removal Figure 7-5. Remove five screws shown in Figure 7-6. Figure 7-6: Display PCB Disconnect ground wire. Remove board from unit. To install, reverse removal procedure. Air/O...
Service Manual Figure 7-8: Air / O Regulator Assembly Blender Removal Remove all hoses and wiring connected to the blender. Loosen allen screws of knob located on the front of the ventilator. Remove knob. See Figure 7-9. Figure 7-9: Oxygen % Knob Remove three screws located behind the knob.
Bear Cub 750PSV Figure 7-10: Blender Removal Figure 7-11: Blender Assembly Exhalation Valve Removal Remove all hoses and wiring connected to the valve. Remove three screws located on mounting plate. See Figure 7-12. Remove Exhalation Valve from the ventilator. To install, reverse removal procedure.
Bear Cub 750PSV Exterior Inspection Turn off the ventilator and disconnect from AC power and pressurized gas at the wall sources. Clean the exterior of the unit with water or a solution of 70% Isopropyl Alcohol solution only. Wipe all surfaces with a soft cloth or disposable wipe moistened in the cleaning solution.
Service Manual CAUTION Circuit boards are subject to damage by static electricity. Do not touch components, circuit, or connector fingers with hands. Handle only by edges. Ground Resistance Test Perform a ground resistance check (follow manufacturer‘s instructions for test equipment operation). Connect a properly functioning leakage and grounding tester between the ground connection and the hospital grade AC plug (middle lug) and the chassis of the ventilator (any unpainted exposed metal part).
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Do not release ventilator for use if it does not pass all of the procedures specified in the checklist. To do so could result in personal injury including death or property damage. Refer the ventilator to a Viasys Service Technician or a Viasys trained Service technician for appropriate repair and/or calibration...
Service Manual Chapter 9 RS-232 Protocol Scope This document defines both the hardware and software protocol for the RS-232 communication port on the BEAR® 1000 Adult Ventilator, the BEAR CUB™ 750PSV Infant Ventilator, and the BEAR® Graphics Display. Throughout this document the ventilator shall be defined as the SENDING device, that which transmits real time data and responds to requests for data in the form of other parameters.
Bear Cub 750PSV Alternatively, the ventilator can be interfaced to a DTE device with the following "null- modem" interface. (See table 9-2). Table 9-2: Alternate Pin Assignment DTE Name DTE Pin Direction DTE Pin DTE NAME - - - - - - - - - - <<- - - - - - - -...
Service Manual of SYN (16h) or DLE (10h) appears in the data packet (including the Check Sum, see below) an escape sequence will be used. The illegal character will be preceded by the DLE character and 10h will be subtracted from its original value. The second character in each packet (both transmitted and received) is defined as the ID character.
Service Manual Table 9-8: Adult Ventilator Monitor Status Mode: Upon Request Length: 18 Bytes Format: [ SYN ] [ID] [Data #1] [Data #15] [Check] [ ID ] : [ Data #1 ] Breath Data Bit 7 — Control Breath (1=on, 0=off) Bit 6 —...
Service Manual Table 9-10: Infant Ventilator Alarm Settings / Status Mode: Upon Request Length: 10 Bytes Format: [ SYN ] [ID] [Data #1] [Data #7] [Check] [ ID ] : [ Data #1 ] Alarm Status Byte-1 Bit 7 — High Breath Rate (1=on, 0=off) Bit 6 —...
Service Manual Chapter 11 Repackaging Instructions General The packaging system for the BEAR CUB™ 750PSV Infant Ventilator has been designed to provide a high degree of protection against shipping damage. All shipments of BEAR CUB™ 750PSV Infant Ventilators should be made using the complete packaging system.
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