- Frank`s Hospital Workshop
Contents
1. Plug a Thermocouple electrode into the test box and leave at ambient temperature Check that the LED changes from red to green Connect an oscilloscope to the test points on the test box Set the oscilloscope to 5 0 volts div and 10 0ms time base Check that the default count setting is 240 pulses Rotate the RF power control to display 45 volts press the start button and check the Pulse burst of RF power 20ms is displayed on the oscilloscope and the counter is counting down Place the electrode tip into water that has a temperature just above 42 C to 45 C the RF pulse burst will stop and so will the counter Remove the electrode from the warm water and as the electrode temperature goes below 42 C the pulse burst and the counter will re start If the Pulse Dose does not stop the count and the RF Pulse burst with a Temperature of 45 C contact the NeuroTherm Technical Support Department Version 2 0 October 2007 Technical Support The CHECK AND TEST PROCEDURE should be routinely performed each time the NT 500 is used A periodic full service on an annual basis is recommended The Operator Must Not Perform any Servicing of the Equipment Maintenance must only be carried out by suitably trained and qualified personnel authorized by the Company In the event of the NT 500 malfunctioning you should immediately contact In the USA NeuroTherm Inc 2 De Bush Ave Suite A 2 Middleton MA01949 USA Tel 978 777 3916 Fax 9782. in place with the two crosshead screws Replace the cover and contact NeuroTherm Technical Support Department to report the suspected fault If one of the fuse indication LED s is not illuminated a fuse has blown Switch off the mains power switch and remove the power cord before removing the Fuse PCB Pulling the handle of the card to remove it from the rack To check fuses 1 Visually inspect the fuses for signs of a blown fuse 2 Ifa fuse is blown only replace with the correct rating fuse Type T anti surge Bussman S506 F102 1Amp F103 1 Amp F104 1Amp F105 3 15 Amp 3 Check continuity of each fuse with an ohmmeter or buzzer 4 Ensure each fuse is secure in the fuse holder clips 5 After replacing fuse refit plastic protective covers Refit the Fuse PCB into the card rack and connect the power cord to the NT 500 turn on the mains switch on machine If the unit does not work and the fuse has blown again contact NeuroTherm Technical Support Department If the fuse replacement has solved the problem switch off the mains switch and remove the power cord Check that all the PCB s are pushed fully home in the card rack Replace the retainer bar and fix in place with the two crosshead screws Replace the cover and fix into place with the 4 Allen Hex screws Carry out the Test of function as described in the next section 3 Test of Functions Version 2 0 October 2007 The NT 500 is a reliable and well proven Lesion Generator if a
3. 777 5121 brittman neurotherm com OR in the UK NeuroTherm Ltd 429 Brighton Road Croydon Surrey CR2 6EU Tel 44 0 208 660 4374 Fax 44 0 208 660 9417 joel neurotherm com Version 2 0 October 2007
4. NT 500 Technical Support Guide For use by qualified company approved Technicians Version 2 0 October 2007 INTRODUCTION The NT 500 is designed to offer the full range of features required to perform radiofrequency denervation The front panel has been ergonomically designed and allows the clinician direct manipulation of the controls Each functional effect of the device is defined within its own discrete area The NT 500 is designed for safe use in the Doctors office Surgery Centre or Hospital environment Linear bar displays are used to give immediate visual interpretation of the temperature RF current and RF Voltage and digital displays are used for impedance stimulate voltage and lesion time The NT 500 has full electronic interlocking to prevent accidental switching to lesion power and stimulation voltage Note The Machine has been factory set and should not be adjusted except by Approved technicians authorized by the company The Machine has been designed to work with NT 500 thermocouple probes only The use of probes from other manufacturers could give serious errors in the temperature reading and may compromise the safety of the patient and would negate the warranty Regularly inspect the NT 500 accessories in particular the electrode cables should be checked for possible damage to the insulation Please note the warning information in the NT 500 User Manual before attempting to carry out any service or mai
5. a check that you can see electrode tip in the Cannula d Cannula placed in an area of the patient close to an artery this can have a cooling effect due to high blood flow limiting the temperature e Check the impedance reading of the patient 400 1000 ohms average f Try anew electrode and Cannula 10 Pulsed RF Does not reach set temperature Pulsed RF does not have to reach the set temperature as this is not a thermal lesion if the temperature does reach the set temperature the NT 500 will reduce the width of the 20ms burst of RF until the temperature is 1 C below the set temp The NT 500 will then supply the full 20ms burst of RF power 11 Pulsed Dose Option An option of the NT 500 is to have a Pulsed Dose RF facility Pulsed Dose RF ensures that the number of full 20ms width pulse burst is delivered to the patient Instead using a time period the Pulsed Dose supplies the correct number of pulse bursts to the pre selected count number The control of the temperature is done by stopping the RF pulse burst and the counter when the temperature exceeds 42 C When the temperature drops by 1 C the counter and the RF pulsed dose will resume at the full 20ms pulse burst This will continue until the count reaches zero the power will switch off and a warning tone will sound 12 To Test pulsed Dose Using the NT 500 TEST BOX connected to the Active and Dispersive connectors set the NT 500 to Pulsed Dose Mode press the pulsed button
6. artment 7 Pulsed RF output Check With the NT 500 TEST BOX connected to the Active and Dispersive connectors set the NT 500 to Pulsed RF mode by pressing the Pulsed button Connect an oscilloscope to the test points on the test box Set the oscilloscope to 5 0 volts div and 10 0ms time base Rotate the RF power control fully anticlockwise check the Pulse burst of RF power 20ms is displayed on the oscilloscope Check that the NT 500 display LED s show Voltage and Current This will display 8 LED s Volts and 2 LED s for current If pulsed RF power is displayed on the oscilloscope check the electrical continuity of the Patient Dispersive cable Approximately 0 5 Ohm and check the electrode If no Pulsed RF Power at test box Contact NeuroTherm Technical Support Department 8 Patient connection Problems No stimulation felt by patient a Is the dispersive lead connected to the patient correctly b Is the dispersive pad the correct size 16sq inches surface area c Is the dispersive cable connected to the NT 500 d Is the electrode connected to the input socket e Is the electrode the correct length for the Cannula is the electrode tip visible at the tip of the Cannula f Ensure that NeuroTherm electrodes are being used Version 2 0 October 2007 9 RF Lesion Will not reach the set temperature a Dispersive lead connected correctly to patient b Dispersive lead not plugged into NT 500 c Electrode too short for the Cannul
7. e Dispersive output connectors from the Test box into the NT 500 Connect an oscilloscope to the Active and Dispersive test points on the test box and set the oscilloscope to read 200 mv div at 1 0ms time base Rotate the stimulate control fully clock wise check that the output pulse measures approximately 3 2 volts on the negative pulse The NT 500 display should show this voltage The frequency is 100 Hz 10ms with pulse width of Ims If the Stimulate Functions works on the test box check the electrode and the dispersive lead to see if they have failed If the Stimulate does not work with the test box contact NeuroTherm Technical Support Department Version 2 0 October 2007 6 No RF Power Output To check for RF output With the NT 500 TEST BOX connected to the Active and Dispersive connectors set the NT 500 to Lesion Mode by pressing the Lesion button and connect an oscilloscope to the test points on the test box Set the oscilloscope to 20 volts div and 1 0ms time base Rotate the RF power control 50 anticlockwise check the RF power is displayed on the oscilloscope Check that the NT 500 display LEDS show Voltage and Current This will display 5 LED s Volts and 1 LED for current approximately If RF power is displayed on the oscilloscope check the electrical continuity of the Patient Dispersive cable Approximately 0 5 Ohm and the Electrode lead for a failure If no RF Power at test box Contact NeuroTherm Technical Support Dep
8. ll sound The alarm will cease The Stimulate and Sensory Button LED s will light and the Stimulate Display should indicate Voltage October 2007 8 Turn the Stimulate Control Clockwise The Stimulate Voltage should display up to 3 0 volts and Sensory Button LED should flash at 50Hz or 100Hz When Motor is selected the flash rate 1s 2Hz 9 Turn the Stimulate Control Fully The Stimulate Display should read 0 0 volts and Anticlockwise any flashing should cease 10 Press the Standby Button Testing of the NT 500 is now complete and machine is ready for use Common Problems and Solutions 4 5 No temperature reading on the Thermocouple electrode Check the electrode for any visual defect to the cable or electrode Plug the electrode cable into the NT 500 turn on the machine and set the machine to lesion mode Ensure that the thermocouple LED changes from red to green 1f it stays red the thermocouple is faulty Change the Thermocouple Electrode To check temperature place the electrode tip into water at 50 C approximately to see if the temperature display changes to the water temperature If not working Change to a new Thermocouple Electrode Redo the temperature test as section 4 If no Temperature reading Contact NeuroTherm Technical Support Department No stimulation voltage To check stimulation Select Stimulate button and then the Sens100Hz button Using the NT 500 TEST BOX Connect the Active output and th
9. ntenance to the machine Any Maintenance or Service must only be carried out by Qualified Technicians Approved by the Company Version 2 0 October 2007 Basic Fault Diagnosis 1 No power to the NT 500 Check the power inlet cable is connected to the wall socket and switched on If the cable has fused power plug check the fuse in the power plug IEC Fuse carrier 2 No power to the NT 500 Check the fuses in the IEC mains power inlet fuse carrier For 110 volt units the fuse should be 2 X 2 amp fused on the Live and Neutral Type T2H Bussman For 230 volt units the fuse should be 2 X 1 amp fused on the Live and Neutral Type T1H Bussman If a fuse is faulty change the fuses Only use this type of fuses as a replacement on this machine Internal Fuses Picture of NT 500 fuse card Version 2 0 October 2007 The NT 500 has a set of internal fuses that can be accessed by qualified company approved technicians Remove the 4 cover Allen screws with a 3mm hex key on the rear of the NT 500 to expose the rack of Printed circuit boards Using a crosshead screwdriver remove the two screws retaining the Printed Circuit Board clamp bar Remove the clamp bar for access to the PCB rack The Fuse PCB 1s the far left hand side of the rack looking at the rear of the NT 500 Turn on the power to the NT 500 and check if the 4 Green LED s are illuminated If all LED s are lit the problem is not a fuse blown replace the retainer bar and fix
10. ny problem is suspected the following test should be carried out to check the functionality of the Machine 3 Test of Functions 1 Turn Mains Switch ON 2 Connect the Probe to the right hand Front Panel Socket 3 Press the Lesion Button on the Front Panel 4 Turn the RF Power Control clockwise 5 Press the Timer Start Button 6 Turn the RF Power Control fully counter clockwise 7 Check the Stimulate Mode by pressing the Stimulate Button Version 2 0 The Mains Green LED on the front Panel will light up If the Mains Green LED fails to light check the fuses fuses are located in the Mains Inlet Module and behind the rear panel of the machine on the Fuse Board The Standby LED will be lit and the impedance Display will indicate a value in ohms The Thermocouple LED will change from Red to Green showing the Probe is connected and operating The Lesion Button LED will light together with 80 C Button LED and the Time Start LED The temperature display will be active and will show if temperature is above 30 C The Time Display should display 60 seconds The RF Voltage Display shows Voltage being present if the display fails to show check the 75V Fuse on the Fuse Board The Amber Lesion Power LED will flash The Time Start LED should flash the machine will count down in second increments from 60 seconds shown in Timer Display When the timer reaches 0 the Voltage Display will turn off and an alarm wi
Download Pdf Manuals
Related Search