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Thinklabs One User`s Manual

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1. Hz Scale Volume LED Minus Key Plus Key Diaphragm Battery Charging Thinklabs One Digital Stethoscope is powered by an internal rechargeable Lithium Ion battery USB style charger is included with your One stethoscope Your One will usually be shipped to you with a partial charge You should charge it fully before using it clinically A full charge should provide over 4 hours of listening Before you charge your stethoscope read these Battery Charging Precautions before you proceed To charge your stethoscope 1 Connect the Charger Cable 3 5mm plug to your One disconnecting headphones if they are plugged in The Charger Cable is a white cable with 3 5mm phone and USB plug on each end respectively 2 Connect the USB plug to the USB Charger Use only the charger supplied with One it has been tested and qualified to be safe for use with your stethoscope Other USB chargers will charge your One however we cannot guarantee their operation 3 Connect the charger to an AC Mains outlet The charger is a worldwide charger 100 240V 50 60Hz In some countries you may require a plug adapter 4 When charging the Battery LED will flash As the battery charges the flash rate will slow When the battery is fully charged the LED will be On and stop flashing A thorough charge cycle can take as long as 8 hours however your One will have almost full capacity within 4 hours To check the battery level see the Battery
2. diagrams show the various levels Power On Off Push ANY key to turn on your One stethoscope Manual Shutoff To manually turn off your stethoscope simultaneously push and hold the key AND the Alt key After 2 seconds the battery level indication will flash across the 0 10 scale display and you can release the keys Automatic shutoff Your One is programmed to automatically shut off after a preset time The factory default is 2 minutes and you can change this to a range of 1 10 minutes See Auto Shutoff Programming Constant On no auto shutoff You can also DISABLE the automatic shutoff This is not advisable for normal clinical use but is useful for longer term recordings Constant On mode will keep the stethoscope on until the battery is discharged at which time it will shut off 10 Volume Control Click the Key Minus Key to reduce volume Click the Key Plus Key to increase volume Volume Level is indicated on the 0 10 Scale NOTE Set the Volume at a level that is comfortable Protect your hearing Do not listen at excessive volume If you have normal hearing you should seldom need to use a volume level in excess of 5 See the Psychoacoustics pg 17 discussion for more on hearing and perception 11 Filter Selection Your Thinklabs One Digital Stethoscope is programmed with multiple audio filters so that you can more finely set your stethoscope to listen to particular frequency
3. ranges according to your work needs and personal preferences The specific filters are listed here The selection may change from time to time Your One package includes details of the specific filters programmed into your One Click f Key Hold f Key Click f Key Using the Filter f Key you can sequence through all the filters or rapidly flip between two selections As shown in Circle 1 Push amp Hold the Filter f Key and One will sequence to the next filter in red circle 1 cycling through all selections If you then CLICK the Filter f Key rapid click rather than hold down your One will remember which filter you have currently selected in red circle 1 and will then jump across to red circle 2 You can then repeat the Push amp Hold sequence to cycle through the same selections in red circle 2 If you then CLICK the Filter f Key One will remember your selection in circle 2 and jump back to circle 1 remembering your selection in circle 1 CLICK again and jump back to your last selection in circle 2 In short Push amp Hold to sequence through filters Click to save your selection and jump to the other circle Once you ve selected a favorite in each circle simply click the Filter f Key to alternate between your two favorite filters 12 Reading the Hz Scale The Hz pronounced Hertz scale provides a general indication of the frequency range or pitch to which your selected filter has been set This provides a su
4. vibrations Provides more high frequencies for lung sounds than Filter 3 but this will also increase ambient sound slightly 5 20Hz 2000Hz 3dB Wideband mode very sensitive Intended for capturing professional research academic recordings Also great for listening if you can handle the sensivitity or you tend to listen at lower volumes 30 Indications for Use The Thinklabs One Digital Stethoscope is intended for use as a diagnostic aid in patient diagnosis It can be used for the amplification of heart lung and other body sounds with selective frequency filtering This product is not designed sold or intended for any use except as indicated Caution e Follow directions for use Misuse of this product could result in damage to the product malfunction of the product or compromise performance e Use only the Charger provided The One has been tested for safety with the provided charger Other chargers could damage the battery or cause heat fire or explosion The One will not function if battery voltage is depleted e Do not sterilize this device or immerse it in liquids Clean using alcohol swabs or non abrasive cloth dampened with alcohol or water e Do not attempt to modify or repair this device yourself If you experience problems send this device to Thinklabs for repair e Avoid use storage in very high humidity high temperature or dusty conditions Leaving the device in excessively hot or cold vehicles is not reco
5. Level Indication section Battery Charging Precautions Thinklabs One Digital Stethoscope is powered by an internal rechargeable Lithium Ion battery Lithium Ion batteries power many devices today mobile phones tablets medical devices However they must be handled properly to ensure safe use Please take the following seriously to avoid injury fire or explosion We have tested One with the included USB Charger We cannot guarantee the safety of charging One with other USB chargers If One becomes hot while charging disconnect immediately and allow it to cool Do not move One while it is cooling Contact Us immediately if One warms up during charging Charge One at ambient temperatures between 5C 35C 41F 95F If the battery temperature is out of range a safety circuit may shut off charging until the battery temperature falls within an acceptable range Disconnect the Charger from the AC Mains or from the stethoscope once charging is complete Do not attempt to open or replace the battery If your stethoscope fails to charge Contact Us For more information go to Battery Charging Instructions Battery Capacity and Battery Level Indicator The battery discharge profile is shown at right and indicates that you should get over 4 hours of listening over 100 patients typically Battery Voltage vs Time The battery level is shown on the 0 10 scale when the One powers off either through manually or auto shutoff The
6. and seems to be working you re probably OK Try charging the One but only if you re convinced it s working OK and it s dry inside If it doesn t work contact us immediately WARNING Lithium Ion batteries can explode if not used correctly Contact us if you have any questions or have any doubts about the condition of your One e Nothing here has helped me solve my problem OK time to get more help We do our utmost to help you get the best from your Thinklabs One Digital Stethoscope To save your time and trouble first look at the other FAQs to see if there s something more relevant to your problem and you can get the answer quickly Failing that go to the Support page or Contact Us and we ll help you out 29 The Audio Filters In Your One The following filters are provided in your Thinklabs One Refer to the Quick Reference if you d like to change the 2 favorites currently set to Filter 1 and Filter 3 1 30Hz 500Hz Produces strong low frequencies for heart sounds especially S3 Bass may be challenging for some third party headphones and other external devices An intense version of a Bell mode 2 60Hz 500Hz Good for heart sounds especially if Filter 1 bass is too intense for your tastes Similar to Bell mode 3 80Hz 500Hz Good for lung sounds heart valve clicks S2 splits Removes lower heart sound frequencies Similar to Diaphragm mode 4 100Hz 1000Hz Good for lung sounds Filters out lower frequencies and
7. are 4 jacks on Thinklink two on the left two on the right The arrows gt lt show their positions Follow the connection steps very carefully Before you start a Set the SOURCE switch to the MIDDLE position b Set the MONITOR switch to the left 1 Connect Headphones to the upper left jack 2 Connect Thinklabs One to the lower left jack via the long male male cable supplied with your One 3 a Plug a short 3 5mm male male right angle connector or short cable to the lower right jack 3 Do NOT connect to iPhone or iPad yet 3 b Turn on your Thinklabs One and set to a medium volume Make sure all switches are set correctly 3 c Launch the Thinklabs Stethoscope App on your iPhone or iPad If needed download the App and start these steps again 3 d Once the App is running and the One is ON only NOW plug the connector or cable you plugged into jack 3 into your iPad or iPhone AS YOU PLUG IT IN a message on the upper left corner should say Headset This tells you that the iPad or iPhone is recording from your One rather than recording from its built in mic If the message instead reads Built In mic unplug from the iPhone iPad and try again and if it doesn t want to cooperate turn up the One and tap on the diaphragm as you plug it into the ipad iPhone What s going on is that the iDevice makes up its own mind as to whether to use built in mic or external and the only way to coax it to use external is to
8. Response The Thinklabs Electromagnetic Diaphragm maintains the tactile sense of an acoustic stethoscope where diaphragm pressure was always used to adjust the sensitivity to lower or higher frequencies Thinklabs takes this to a new level The stethoscope diaphragm sits in front of a conductive plate inside the stethoscope body Vibration is sensed when the diaphragm vibrates and the gap between the diaphragm and the plate behind it changes due to diaphragm vibration Body sounds cause very small gap changes Pressure you apply against the patient has a far greater effect on the gap between diaphragm and the plate The chart shows how frequency sensitivity changes as you push harder reducing the gap sensitivity changes from the blue to purple to pink graph Notice how the low frequency bass sounds increase When you listen as you apply more pressure low pitched sounds get louder HOWEVER when you push hard enough for the diaphragm and plate to touch vibration will decrease and you will no longer hear low pitched sounds as intensely This can be helpful to reduce heart sounds when listening to lungs But generally apply enough pressure to find a Sweet spot where sounds are rich and loud NOTE Changing diaphragm pressure and thereby changing gap produces very large signals that can clip the sound So make gentle changes in pressure and generally apply a steady consistent pressure to avoid clipped sound 16 Psychoacoustic
9. Thinklabs One User s Manual aq Thinklabs Digital Stethoscopes Table of Contents Introduction Welcome to ThinklabS COMMUNIY cccccccccccccccceccececceececeeeeeeeeeesseeseeeeeeseeseaeeeeeeees Pq 3 Operating The One Controls and Disp la acieirar e ida iiet dase aa Pg 7 Advanced Topics Thinklink amp Connectivity csset naa aa aa iaaa Pg 18 20 Maintenance General Maint NaNCe eeeeeeeeeenenrrreererreneeeeesreseeeeneeeeeeseeeenes Pg 21 Diaphragm Cleaning amp REMOVAIN ccccccccccccccccccccccecceceeeeeeeceessusseceeeeseseueeeeeeeeussssees Pq 23 Cleaning Inside the On iieeeuuuuieeeeeeeeeeeerrererseeeeuueersseeeeenensenn Pq 24 Additional Information Welcome to the Thinklabs Community Congratulations You now own the revolutionary Thinklabs One an electronic stethoscope like no other Welcome to the Thinklabs Community of clinicians researchers educators and students who believe in quality in everything they do Quick Reference Guide Design Thinklabs One is designed with form and function intended for an era of compact efficient design a stethoscope for the age of digital music and instant communication The design hides advanced technology and an elegantly simple form Amplification With over 100X amplification compared to a typical acoustic stethoscope One s small form hides an extraordinary power to reproduce heart sounds with the pu
10. US and Foreign Patents Issued and Pending 2004 2014 Thinklabs Medical LLC All rights reserved Thinklabs Rhythm Hear Everything in a Heartbeat are registered trademarks of Thinklabs Medical LLC Centennial CO 80111 The Thinklabs logo One the Rhythm logo High Resolution Auscultation EmD Electromagnetic Diaphragm ANR2 are all trademarks of Thinklabs Medical LLC Centennial CO 80111 Tel 1 800 918 1088 Outside USA 1 303 525 3458 6500 South Quebec 250 Centennial CO 80111 32
11. aces that might need cleaning from time to time Removing and Cleaning Unscrew the diaphragm ring counter clockwise when looking at the diaphragm You can clean both sides of the diaphragm with alcohol Make sure that the inside of the diaphragm does not remain with any oily or other residue It s important that the inside surface be clean and free of any surface grease or other chemicals to operate well Attaching the Diaphragm VERY IMPORTANT When you replace the diaphragm and screw on the diaphragm ring clockwise make absolutely sure that you have it on straight It s a good idea to turn it COUNTER clockwise until you feel it align and then GENTLY screw it clockwise If it feels like it s not screwing on cleanly start again The reason is that the thread is intentionally quite soft to keep the ring on and can be easily threaded Screw until the diaphragm is in place and doesn t rotate freely but DO NOT OVERTIGHTEN firm not tight 23 Cleaning Inside Your Stethoscope There is generally no reason to open your Thinklabs One Digital Stethoscope However if the situation arises that you d like to clean inside this is how you do it You might also want to perform these steps if your One stethoscope is producing strange noises which may be caused by lint or dirt inside your stethoscope 1 Turn off your Thinklabs One stethoscope Push and hold and ALT keys together for a few seconds then release 2 Unscrew the Diaphrag
12. connected well and you still have only one side playing check the headphones themselves This is simple to diagnose connect the headphones to a different sound source such as a computer or mobile phone and play music If the headphones work properly move the wires around to check if you have an intermittent connection Alternatively connect a different set of headphones to your One and see if the problem persists If you have discovered that your headphones are working well and it s definitely your Thinklabs One electronic stethoscope go to Support for further help e One is producing unexpected interference or noise Your One electronic stethoscope should provide a low noise high quality signal If used on clothing or not applied correctly to the patient artifact can be produced Simply apply the Probe as recommended making good contact with the patient 26 There are some interfering noises that can occur even when not examining a patient Some potential culprits are listed below with remedies Radio stations or electromagnetic pickup Move One to a location that does not have strong electromagnetic fields One has been hardened against such interference but it is technically possible albeit unlikely that noise can be induced by such sources Continuous loud buzzing The diaphragm is loose Tighten the diaphragm retainer ring Continuous loud buzzing One is connected to other equipment that is either producing its own bu
13. cuts out temporarily when listening 27 Your Thinklabs One digital stethoscope is designed to produce very clear undistorted sound If you re not getting clear sound possible problems and solutions Volume is too high Reduce Volume level Excessive pressure is being applied when listening Decrease pressure for loud sounds For in ear headphones your headphones might not be sealed in your auditory canals so the speaker cones are moving with no resistance and the One s power is driving them hard Try sealing your in ear headphones For on ear or over the ear headphones your headphones might not be up to the task of reproducing the One s bass Even high priced headphones aren t always designed for strong bass Think hip hop not classical music when considering what your headphones can handle One is not being held in a firm and steady position or is not being held with a steady pressure against the patient Changing pressure is akin to vibration Thinklabs EmD diaphragm can sense frequencies down to the sub sonic range in order to cover the whole audio spectrum for murmur detection Vibrations caused by patient or user hand movement are also sometimes sensed as loud signals that distort body sounds Hold One steady with a light but consistent pressure against the patient If in a moving situation ambulance aircraft it sometimes helps to hold the One stethoscope so that the fingers holding your stethoscope also touch the pat
14. ensing plate behind it and its vibration will decrease This is similar to conventional stethoscopes where pressure of the chestpiece had an effect on sensitivity We ve kept that tactile feel on One along with other abilities to control the sound So vary the pressure of the diaphragm against the patient and learn to find that sweet spot Another obvious matter is the volume level and filter setting Make sure you have enough volume for faint sounding patients and set the filter appropriately to capture low frequencies for heart sounds Finally there s the question of headphone seal and headphone quality whether you are using good headphones This is discussed in this FAQ and also in the general headphone FAQ on the website e I can hear sound from Left or Right headphone but not both Your headphones are probably faulty likely due to a damaged wire But first let s eliminate the simplest possibility that you haven t plugged the headphones in all the way Check to make sure you ve connected your headphone plug all the way into One s jack Note that the jack hole is rather narrow about 6 5mm to be precise So some plugs are a bit too fat to fit all the way If that s a possibility use the short male female extension cable supplied with your One Connect this short cable into One and connect your headphones to the cable If you hear both L and R your headphones weren t plugged in all the way If you re sure that the headphone plug is
15. evision Fletcher Munson curves shown blue for comparison When you auscultate increase stethoscope volume and low pitched sounds will be more prominent Turn down volume and bass diminishes faster than treble This is psychoacoustic not real It s also why an acoustic stethoscope is so unsuited for low pitched heart sounds 17 Thinklink Using One with Mobile Devices The Thinklink kit provides all the cables and connections to connect One to iPhones iPads Android devices computers digital recorders and so on NOTE Image at right does not represent a connection diagram See Connecting Thinklink for specifics You can record sounds from One to your recording device iPhone iPad etc while listening via headphones You can then listen to your recordings via the headphones Thinklink allows you to do this with a simple connection configuration Simply switch between recording or playback on the Thinklink switch Your One becomes an external microphone to your mobile device It can therefore work with almost any App See the Apps Page for ideas on how to use One Note however that the quality of recordings or stethoscope sounds depends on the device you are using as well as the App For example many telemedicine apps compress the sound so recording sounds first and then sending files can sometimes superior to using a low cost video conferencing App SOURCE Dml MONITOR 18 Thinklink Connections There
16. have a sound signal active AS the plug is inserted SOURCE mm al lt PC Mic Jack Not Req d for Mobiles From To Headphones 1 gt Thinklabs One 2 gt PASS ITOR 3 5mm male male SES lt 3 To Mobile Device Headset Jack Right Angle connect short 3 5mm cable 19 Thinklink Recording To Record Set the Monitor switch to the left monitor One Set the Source switch to the center or right position The center position reduces the signal level to the mobile device This is usually necessary since the One is usually too loud for most recording devices You may also find that reducing One s volume level to a 0 to 2 range is necessary during recording to reduce clipping and distortion Note that you can record from a headset microphone by switching the Source switch to the left position This will connect your headset mic to the mobile device input rather than connecting One as the audio source This can be useful for dictating voice to annotate recordings Note that you must be using headphones that have a built in microphone to perform this function SOURCE joo i MONITOR Thinklink Playback To Play back recording and listen to your recording device via the headphones Set the Monitor switch to the right mobile Adjust the volume on the playback device itself 20 General Maintenance and Cleaning e Do not immerse your One electronic stethoscope in any liquid If One is
17. ient chest wall so that stethoscope and chest wall move in unison e I work in a noisy environment and I can hear ambient sound Thinklabs stethoscopes are designed to attenuate ambient noise The EmD Diaphragm and acoustic design of the One naturally reduce ambient noise However this works best when you have good skin contact First thing to do is get good skin contact rather than listening through clothing Consider your filter settings We provide filter settings that cut out higher frequencies especially for heart sounds Play with the various filters and find the ones you like best for your work environment See the Filters section for more advice on this Consider the volume level Don t over amplify if you don t need to 28 e My Thinklabs One got wet or something leaked into it 1 Unscrew the diaphragm ring remove the diaphragm and holding your finger against the plate behind the diaphragm on the silver circle shake the One to get as much liquid out as possible 2 Let it dry Do NOT try and charge the stethoscope or even turn it on while it s wet Shake out all the liquid and allow it to dry Google search drying cell phones lots of tricks out there 3 AFTER it s dry replace the diaphragm and diaphragm ring Read the instructions for doing so and do not damage the sensitive thread on the One by screwing it on wrong 4 AFTER it s dry and you ve closed it up try turning it on and test it out If it sounds OK
18. inadvertently immersed in liquid do NOT Power ON the unit Completely dry out the inner spaces before trying to use the stethoscope again Contact Thinklabs for assistance Do not sterilize One using any sterilization process Wipe your One with alcohol swabs or a soft cloth moistened with alcohol or water Do not use abrasive cleaning agents and do not allow fluids to enter the device e Avoid extreme heat cold or humidity for either storage or use of this device 4F to 110F 20C to 43C storage Room temperature is recommended for use Note that closed vehicles reach well above 120F in summer e Avoid excessive force applied to any part of the stethoscope Damage could result e Avoid dropping the One on hard floors especially concrete Damage could result Fully charge battery if stethoscope is not to be used for a period of months Damage resulting from inappropriate care of the device may compromise product performance or void the Warranty 21 Headphone and Eartip Cleaning and Replacement Your Thinklabs One is supplied with Thinklabs in ear studio quality headphones Three eartip sizes are included Small Medium Large The Medium size is fitted on your Thinklabs headphones e Changing Eartips To remove ear tips grip the eartip by the flap and gently twist it off DO NOT place undue force on the headphones Almost no force is required for removal it s just a matter of pulling in the correct direction pulling and ang
19. ling the eartip so that it rolls off the shaft To place the new eartips onto the headphone shaft gently push the ear tips on keeping them straight e Cleaning You can clean the ear tips with alcohol wipes or with soap and water if they need a thorough cleaning Whatever you do try not to lose them while removing and cleaning them e Replacement You can go to the Thinklabs Store to purchase eartips or Contact Us and request eartips telling us which model Thinklabs stethoscope you own 22 Diaphragm Cleaning and Replacement Your Thinklabs One Digital Stethoscope has a patented Thinklabs Electromagnetic Diaphragm It operates on an elegantly simple principle of physics a large electric field exists between the back of the diaphragm and a conductive plate behind the diaphragm Note that there is NO electric field outside your One stethoscope This is a robust system and the diaphragm is strong and not easily damaged What is important is to keep your One stethoscope reasonably clean and dust free good practice for health reasons anyway Read below but also see the related section on Cleaning Inside your stethoscope Cleaning Outside Wipe any external part of your Thinklabs One Digital Stethoscope with alcohol wipes The diaphragm can be cleaned with other cleaning agents but avoid allowing liquids to leak into the stethoscope You can also unscrew the diaphragm ring to clean inside the stethoscope and in more inaccessible pl
20. m and clean it see instructions here 3 Using a dry air spray available from office supply stores and hardware stores spray around the blue circuit that you see when you ve removed the diaphragm use the straw that s supplied with the spray can Do it well but don t overdo it 4 Allow the open stethoscope to dry out for a couple of minutes or more if you re in a humid environment 5 Replace the diaphragm see instructions here READ THEM they re important 6 Turn on your stethoscope and check the sound quality If you re hearing strange sounds give it a few minutes to settle down and dry out more especially in humid environments then try again 7 If repeated cleaning does not correct any noise problems contact us If your One stethoscope sounds good you ve probably successfully cleaned your stethoscope NOTE A DO NOT use liquids to clean inside the One stethoscope B If liquids dirt entered other areas of your stethoscope such as via the headphone jack contact us before dismantling 24 Troubleshooting e My Thinklabs One doesn t turn on Make sure you know how to turn it on just push any key One uses a rechargeable Lithium Ion battery See the battery charging instructions for further information If you have attempted to charge the battery and you are sure that the charger was connected to a live power source it is possible that either the charger the charger cable or the stethoscope are faulty Con
21. mmended e The Thinklabs One has been tested to be resistant to electromagnetic interference EMI amp ESD However it may be susceptible to stray electromagnetic fields If unexpected sounds are heard change location or move away from possible sources of interference such as cellular telephones or wireless devices e At the conclusion of this device s useful life dispose or recycle in accordance with local regulations 31 Service and Warranty This product is warranted against manufacturing or materials defects for a period of two years from the invoice date If a material or manufacturing defect occurs within the warranty period repairs will be performed free of charge upon returning the device to Thinklabs The warranty will be voided in cases of abuse excessive or inappropriate use conditions or accidental damage to the product Thinklabs may at it s sole discretion replace the product with a suitable equivalent model The warranty is transferable at Thinklabs discretion only Warranty Document For maintenance repair service and contact information check the Support Page which has helpful information for troubleshooting getting help or sending your stethoscope to us for repair You can also Contact Us for assistance Patents Copyrights Notes Thinklabs One is Assembled in the USA Sub Assemblies Made in USA and other countries US Patents 6 498 854 6 661 897 7 940 937 8 275 140 7 346 174 8 243 940 Other
22. nch of a rock drummer or a hip hop track Audio Filter System Multiple filters give you control over the sound with far more nuance than the blunt instrument of a bell or diaphragm You can also limit bandwidth to exclude ambient noise Rechargeable Battery A Lithium Ion battery gives you the battery life you need in a compact device Charging is made convenient and easy using a standard USB style charger Patented Transducer Thinklabs has built its reputation on technology that maintains the timbre and tactile sense of an acoustic instrument with the clarity and power of electronics Connectivity Thinklink gives you connection to almost any device you re likely to use for recording telemedicine communication teaching or research Use mobile phones tablets computers digital audio recorders Support Owning a Thinklabs is a mark of those who take medicine seriously We take our service to you as seriously Thinklabs One Features Amplification Versatile Filters Ambient Noise Rejection Thinklabs Patented Technology Compact Design Thinklabs Quality Headphones Headphone Choice Rechargeable Battery Industrial Design Ergonomics Connectivity x Apps Support Assembled in USA More than 100X a typical conventional stethoscope Amplification increases sound level from obese patients and faint heart sounds e Multiple filters for different frequency ranges to provide more c
23. ng Use Thinklabs headphones or equivalent high quality headphones Battery Charge Remember to charge your battery Your Thinklabs One will give you many warnings to recharge your battery and it is designed to have enough charge for only one or two charge cycles a week Package Contents 1X Thinklabs One Digital Stethoscope 1X Thinklabs In Ear studio quality headphones 1X Spare Eartips Small Medium Large pairs provided 1X USB Style Battery Charger 100 240V worldwide use US style plug 1X Charger Cable 1X Headphone 10cm male female adapter 1X Thinklink Thinklink switching system for recording and monitoring Male Male long cable 1m Male Male short cable 10cm Male Male right angle connector for mobile devices 1X Quick Reference 1X Regulatory and Warranty Information Control and Display Controls are shown below Four keys control Volume Filter Selection and other functions Briefly Hold any key to Turn On Hold a amp to power off manually Volume Use and Filter Click f rapidly to switch between 2 favorite filters Hold f longer to sequence through all filters Any current selection becomes a favorite The Display shows Volume on 0 10 scale Filter selection indicating low medium or high range Battery Level scrolls across 0 10 scale when One turns off Battery Low Level warning or Charging Controls amp Display Filter Key Alt Key
24. o listen Notice that the mauve graphic extends to a lower frequency before it begins to drop off sharply This means that lower frequencies will be audible using the mauve filter 000 better for low heart sounds Conversely selecting the cyan filter 000 will allow higher frequencies to be audible better for lungs Note that there is a tradeoff between hearing higher frequencies and filtering out ambient sound Ambient noise tends to be higher frequency so it s advantageous to filter out higher frequencies to eliminate background noise but it can also attenuate higher pitched breath sounds Play with different filters and this will become apparent 14 Power Auto Shut Off Time Programming You can set the Auto Shutoff time to be from 1 10 minutes You can also disable Auto Shutoff To program Auto Shutoff 1 Turn on One by pressing any key 2 Click the Alt Key to indicate the number of minutes you d like to program for Auto Shutoff If you d like a 1 minute Auto Shutoff time click once for 2 minutes click twice for ten minutes click 10 times DO NOT CLICK MORE THAN 10 TIMES if you want Auto Shutoff to operate 3 Now Push and Hold the Alt Key until the One shuts off This will take about 15 seconds Your One is now programmed Constant On Mode Disabling Auto Shutoff Perform the same procedure as above but Click the Alt Key AT LEAST 11 times in Step 2 15 Diaphragm Pressure amp Stethoscope Frequency
25. ontrol over sound Filters include settings that reduce ambient noise Electromagnetic diaphragm recognized for producing excellent sound Handheld design that fits in your pocket Excellent sound and comfortable fit Use high quality external headphones from your favorite audio brand No need to replace hard to find batteries Luxurious design using best in class materials Clear user interface and simple operation Thinklink connects to iPhone iPad Android Tablet computers etc Record and Share sounds using audio apps and communications apps Thinklabs personal support going the extra mile for customers Quality assembly inside Thinklabs own facility Optimal Use of Your Thinklabs One Digital Stethoscope Instructions Your Thinklabs One Digital Stethoscope has been designed to be very easy to use However if you take the time to learn the deeper features of your stethoscope you will probably use it more effectively Sound Levels Thinklabs One can be set to very loud volume levels Don t make your stethoscope volume louder than necessary Adjust volume so that heart and lung sounds are clear and comfortable to listen to Protect your hearing Diaphragm Pressure and Skin Contact Making skin contact will provide you with the best sound quality If you do listen through clothing avoid listening through thick garments Headphone Fit Make sure your headphones are as sealed as possible against outside noise This will enhance your own listeni
26. perior foundation for understanding what you are listening to and provides a more informed view of auscultation If the LEDs towards the left are on the filter you have selected will pass low frequencies If the LEDs to the right are on higher frequencies will be passed The broader the number of LEDs the broader the frequency range being reproduced How do you choose filters for particular listening Use lower pitched filters for heart sounds and higher pitched for lung sounds A range of filters is provided so that you can fine tune your own preferences See details of the complete selection and do some listening tests to determine your preference Alternatively turn on your One and simply enjoy it 13 Stethoscope Filter Selection Your Thinklabs One Digital Stethoscope offers a revolutionary change in filtering sound for auscultation Instead of the limited Bell Diaphragm selection you get multiple filters Actual filters can change between software revisions Sounds comprise a combination of lower and higher pitched sounds Some sounds such as S3 heart sounds contain very low frequencies low pitched valve clicks have somewhat midrange frequencies and lung sounds and wheezes contain much higher frequencies The filter charts show the extent to which a given range of frequencies are amplified or allowed to pass and which are attenuated or blocked The higher the graph the more that frequency is passed through for you t
27. s and Stethoscope Volume As you adjust stethoscope volume you will find that you hear low pitched sounds better when the volume is higher even if you do not change filters or diaphragm pressure This is due to a psychoacoustic phenomenon discovered by Fletcher amp Munson in 1933 The chart shows that as frequency increases increasing X axis the ear requires less and less volume to perceive the sound at equal loudness Going the other way from higher to lower frequency in order to hear a low frequency with the same sense of loudness as a higher frequency it is necessary to turn up the volume as you get lower in frequency Looking at the lowest red curve a sound at 1000Hz and OdB A will sound just as loud as a 100Hz sound that is 20dB louder B Looking at the curves higher up on the chart notice how they are flatter What that means is that when sounds are louder the ear perceives lower and higher pitched sounds more equally What does this mean Quite simply your ears don t hear bass very well when the sound is quiet but as you turn up the volume your ear begins to hear MORE bass Turn up the music and you hear more bass Now you know why sub woofers are so large 130 120 110 100 90 80 70 60 50 40 30 20 10 z 0 10 H estimated 3 109 phon DE OUT PS RTE RE PRET RE s LT Sound Pressure Level dB SPL threshald 10 100 1000 10k 100k Equal loudness contours red from ISO 226 2003 r
28. tact us for further assistance e There is a lack of bass or sound is tinny 1 Are the headphones connected properly Is the plug in all the way If not plug may be too fat and you need to use the short extension cable we provide 2 Are the headphones sealed in your ears well enough If using in ear headphones they MUST be well sealed blocking outside sound if you want good bass 3 Are the headphones up to the job Some headphones don t have good bass If you re using on the ear or over the ear headphones you need really good quality headphones that seal out outside noise and have really good bass 4 What Filter setting are you using You must use a lower frequency filter setting when listening to heart sounds for instance See the section on Filter settings to learn more e Heart sounds on some patients are difficult to hear Heart sounds naturally vary from patient to patient Obese patients have attenuated heart sounds as do older patients Chest hair and some clothing such as knitted or thick garments can reduce the coupling between the diaphragm and the chest Finally sounds are dependent on the location on the body There is also a technique to using One well Start by applying a light pressure on the diaphragm As you increase pressure One becomes more sensitive and volume increases There is a Sweet spot where diaphragm sensitivity is at a maximum Then if you push even harder the diaphragm will 25 touch the s
29. zzing or noise or has grounding problems that are inducing noise in the system Try disconnected One from the equipment and listening If problem goes away it s not the One If it persists check diaphragm et al Other noise Dust or moisture may exist inside the Probe See the instructions on cleaning the inside of your One electronic stethoscope e I m hearing some strange noises squealing or thunder hissing noises This is a rare but possible problem that s really easy to correct If you re hearing really weird noises from your stethoscope that possibly change when you press on the diaphragm there s probably some lint or foreign speck of dust inside your stethoscope Super easy to clean Refer to the cleaning instructions unscrewing the diaphragm and using a dry air spray to clean out the space around the sensor The origin of such noises is quite simple There s a high voltage between the diaphragm and the plate behind it This is the unique Thinklabs sensor design Now if a piece of lint gets into your stethoscope it might sit between the high voltage plate and some other part of the circuit or the diaphragm The lint then provides a current path for the sensor to discharge This tiny pico amp or nano amp current flow will sound like thunder or strange sound effects after it s amplified but in reality it s completely benign in terms of potential for damage So don t worry just clean it out e Sound is sometimes distorted or

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