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[PDF] valleylab force 2 esu service manual - mit-segeln. Read online download and read valleylab force 2 esu service manual valleylab force 2 esu service. Follow the instructions in this manual for proper use of the Electrosurgical permission of Valleylab, Inc: . the Force 2 generator, refer to the Service Manual . 7. Valleylab Force 2 Service Manual. Valleylab - Force 2 by Valleylab. Valleylab - Force 2. Download PDF. Product Details · Forums · Documents; Parts; Videos.
Skin-ta-skin contact for example, between the arms and the trunk of the patient should be avoided by the placement of two to three inches of dry gauze. This will reduce the potential for alternate site burns.
Do not use in the presence of flammable anesthetics. This equipment is for use only by qualified personnel. DO NOT turn down to an inaudible level. Do not remove cover. Refer to authorized personnel for service.
Change fuses only when input power is off.
Refer to trained personnel for service. Never increase the power settings without first checking both the active and the patient return electrodes and their connections. In general, the active electrode should be utilized only for the minimum time necessary to achieve the desired surgical effect in order to minimize the possibility of unintended burns.
This is especially true in pediatric and neonatal applications and where small appendages are involved. Failure of the electrosurgical equipment to produce the desired effect at otherwise normal power settings may indicate faulty application of the patient return electrode or failure of an electrical lead. Do not 9 increase power output settings before checking for problems with accessory leads or misapplication of the return electrode, Effective contact between the patient and return electrode must be verified if the patient is repositioned after the initial application of the return electrode.
Potentially hazardous conditions may exist when electrosurgical accessories with similar connector types are used interchangeably. Be certain that Monopolar and Bipolar accessories are used in the appropriate power output receptacles. Random electronic component failures may occur, leading to unintentional or increased output or non-function of the generator. A back-up generator should be available.
Refer to this manual for preventative maintenance recommendations, function, and output power verification procedures. Refer servicing to qualified personnel, or contact Valleylab.
Do not reuse or resterilize. Special precautions should be taken when utilizing electrosurgery in close proximity to or in direct contact with any metal objects including, but not limited to, Gomco clamps, Kocher clamps, and hemostats Such electrosurgical usage, particularly over prolonged periods of time, could result in unintentional and unwanted tissue destruction and burns.
The hazards of such a procedure probably cannot be reduced entirely, and burns to the surgeon's hands are possible. The detector output amplies and inputs to four comparators.
Two comparators provide hard wired alarm limits at 5 ohm and ohm alarm limit for dual-pad patient return electrodes. The third comparator provides a hard wired alarm limit at 20 ohms for single pad electrodes. The fourth comparator generates a pulse width modulated waveform by comparing the return electrode monitor resistance to a triangle wave that an oscillator generates.
The CPU decodes this pulse width to implement the adaptive REM feature for dual-pad resistances between 5 ohms and ohms. A bridge rectier, two hold-up capacitors and four power FETs in a bridge conguration supply the input power.
A IC regulator with emitter followers performs duty cycle control and drives the transformer T3, that switches the power FETs. The IC contains a sawtooth oscillator, pulse steering logic, and a comparator. The error voltage on pin 1 varies from 0. The power transformer has snubber networks to limit voltage spikes.
Power supply control uses an op amp within the to amplify the difference between a feedback fraction of the DC output and a reference voltage ECON.
The CPU generates the reference and the reference scales as the square root of the front panel power setting. There is a DC current limit implemented with a comparator and pulse stretcher. The R-C network on the pin 7 provides a power on reset. Circuit Descriptions A separate switching power supply on the rear of the chassis supplies the low voltages. The Vdc voltage converts to -5Vdc using a LM regulator.
Warning The power FETs and other components on the supply heatsink are at line potential. Use extreme caution when probing this circuitry.
T-off, RFT 1 is not a requirement and therefore terminates at the ribbon cable with a 10k ohm resistor. Current limiting and peak voltage limiting circuits prevent damage under extreme load conditions. Varying the supply voltage controls the power. Both DC supply and RF current limit levels calibrate for each mode - cut, coag, blend and bipolar.
The output tuning and transformer turns ratio is different for cut and coag waveforms and a relay performs the selection. A current sampling resistor at the sources provides input to a current limit circuit. Gate drive is direct at a 12V level. The drains have diodes in series to allow the output transformer primary voltage to swing negative in coag.
Turning on the FETs for 2 s every 32 s generates the coag drive waveform. RF control uses a RS ip-op to control the T-on pulse to the output stage.
ValleyLab Force 2 - Service Manual
The RS ip-op can be reset by feedback circuits to reduce output drive pulses for control of RF output. Excessive output current compared to ICON or excessive negative going voltage compared to the ECON setting can generate this pulse reduction, pulse wacking. The signal from the primary attenuates and then compares to a reference level proportional to the ECON setting. This attenuation is mode specic for cut, blend, and coag.
When the negative going voltage from the primary exceeds the reference level, this removes wacks the RF drive pulses and adds a resistive load in parallel to the primary to dampen the output waveform. When peak voltage limiting occurs, the reference voltage to the LM current limit comparator reduces which in turn reduces the output pulse width.
This one shot places a resistive load across the output and reduces high frequency risk currents. The FET output is rather low impedance, and the choice of DC supply voltage as the power control parameter limits its voltage compliance. Above ohms load, the output resembles a constant voltage source. Below ohms load, the current limit circuitry enforces a constant current characteristic.
All eight output FETs must be the same type. Interference from the electrosurgical current can cause a pacemaker to enter an asynchronous mode or can block the pacemaker effect entirely. While using electrosurgery during a surgical procedure, the patient should not be allowed to come into direct contact with grounded metal objects surgical table frame, instrument table, etc.
This may not be practical during certain procedures e. Use extreme caution in those situations, to maximize patient safety. The risk of an electrosurgical burn can be reduced but not eliminated by placing the electrodes or probes as far as possible from the electrosurgical site and the patient return electrode also referred to as "patient pad" or "patient plate". Protective impedances resistors or RF inductors installed in the monitoring leads may reduce the risk of such burns. The hospital biomedical engineer should be consulted for further information.
Needles should not be used as monitoring electrodes during electrosurgical procedures. When an electrosurgical unit is activated, the conducted and radiated electrical field may interfere with other electronic medical equipment such as monitors. Provide as much distance as possible between the monitor and the electrosurgical generator to minimize interference paths. Skin-ta-skin contact for example, between the arms and the trunk of the patient should be avoided by the placement of two to three inches of dry gauze.
This will reduce the potential for alternate site burns. Do not use in the presence of flammable anesthetics. This equipment is for use only by qualified personnel.
DO NOT turn down to an inaudible level. Do not remove cover.
Valleylab Force 2 Service Manual
Refer to authorized personnel for service. Change fuses only when input power is off.
Refer to trained personnel for service. Never increase the power settings without first checking both the active and the patient return electrodes and their connections. In general, the active electrode should be utilized only for the minimum time necessary to achieve the desired surgical effect in order to minimize the possibility of unintended burns. This is especially true in pediatric and neonatal applications and where small appendages are involved.
Failure of the electrosurgical equipment to produce the desired effect at otherwise normal power settings may indicate faulty application of the patient return electrode or failure of an electrical lead.The output of TO is internally programmed to be 2 MHz. This generator has three possible RF output receptacles. Further, it accepts all activation signals after the Interface board decodes them and performs the necessary steps to produce the desired RF output.
Also, all calibrations listed in the procedure are made at the factory before the generator is accepted by QA. Adjust the Coag display 10 1.