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 *F.A.Q. Complimentary Endoscope Information and Inspection Procedures! F.A.Q. +Museum!


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( Warning: Graphic endoscopy photos )








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 *Inspection Procedures for Most Flexible Endoscopes:


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*Flexible Endoscope INSPECTION PROCEDURES    

        ( black dots )






1) View the image: If fiberscope check for: Broken fibers,
 ( black dots).     

Observe if any signs of fluid invasion; Stains, "Redcrack", X-Ray yellowing, image brightness etc. Also view eyepiece for dust, fluid contamination etc. 

  If checking a Videoscope; Put endoscope in processor, observe image for signs of fluid invasion ( foggy ) and picture break-up, ( angulate the scope by turning knobs). If Image is stained, redcrack repair will be required. If video picture has interference, a Major Fluid invasion or CCD repair is needed!

How Fluid Invasion
Problems Occur;

  1. If a scope has a leak which is not detected and the scope comes in contact with any fluid, moisture will enter the scope through the leak.
  2. In fiber scopes, the scope will have major fluid invasion if the scope is immersed with then ETO venting cap on. For video scopes, the water proof cap must be attached before contact with any fluid.
  3. If a scope has a fluid invasion and is not repaired immediately, video chip damage and image staining can result, as well as corrosion of the internal metal components.

Remember - fluid problems are a scopes worst enemy!

How Image And Light Guide Problems Occur;

  1. Buckles or bites in the insertion or light guide tubes can break image and light guide fibers.
  2. Fluid invasion can cause staining of the fibers,or video chip damage, if not repaired immediately. The fluid also causes brittleness of the fiber bundles.


2) Plug Video scope into processor, test #1 , 2,3,4 Freeze frame buttons.  If there is fluid invasion, buttons will either not work or cause constant freezing and beeping of Processor and will require replacement...


3) Observe Light guide illumination bundle by observing image, then unplug scope from light source, hold distal tip to a light and be sure it is not over %10 broken.                   


  If over 10%, Illumination bundle will require replacement...

  1. Pulling on the insertion or light guide tube, as well as dropping the scope, can cause broken fibers or damage to the video chip.



4) Test Air Leakage: use a air leakage tester and pump p endoscope with air: waiting 3 minutes @ 3.5 kg/cm2


Submerse endoscope in water and angulate endoscope to check for small leaks in bending rubber, insertion tube, light guide tube, body etc


If leaks are found anywhere on endoscope, this may cause Fluid invasion, and endoscope will require Aeration immediately!

How Bending Sheaths Become Damaged;

  1. Any sharp objects like instruments, fingernails or bites can cause tears or holes in the sheath material.
  2. Over time, normal wear or over inflation can cause stretching or looseness of the bending rubber material.
  3. If the ETO cap is not in place during the ETO gas sterilization process, the scope will pressurize and the bending sheath will explode like a balloon. Follow the instructions on the white card attached to the ETO cap.

5) Test Air Water functions: With Endoscope plugged into light source or processor, and depressing air/water valve; water should spray out of nozzle over objective lens at least 30 cc's in 30 seconds, holding finger on air valve; 50cc's in 5 seconds using a measuring beaker...Water should shoot over objective lens. Be sure nozzle is not missing. If air or water is faulty or missing, air/water nozzle or channels will require unblocking or replacing...

How Air/Water Problems Occur;

  1. Scope is not cleaned immediately following procedure.
  2. Nozzle is damaged, ,missing or misaligned.
  3. Glutaraldehyde buildup from chemical disinfectants can break away from the channel and clog the air/water nozzle.


6) Test suction by connecting endoscope to suction pump and with suction on, depress suction valve with tip in 80cc of water, endoscope should allow 80 cc's in 5 seconds. If a groove is worn in suction port, suction will be decreased and will require replacement...




7) Using the correct size Biopsy Forceps, pass the Forceps through the endoscope biopsy channel and text for kinks in the channel. Angulate endoscope while passing through distal end of scope. If forceps do not pass or resistance is felt, channel(s) may require replacement...

Biopsy Channel Damage Is Usually A Result Of:

  1. Kinked, damaged or open Flexible Endoscope biopsy forceps can cause tears in the channel material.
  2. Buckling of the insertion tube can also cause buckles in the channel.
  3. Forcing instrumentation through the channel can cause wear or tears in the channel material. This frequently occurs in the bending section when resistance is met when the scope is angulated. Do not pass anything through the bending section with the tip is angulated further than 110°.




8) Using the correct size cleaning brush, remove suction valve and pass through suction port till it is visible at suction port on connector, if any resistance is felt, suction channel will require replacement!


( represents bad buckles @ boot )

9) Check Insertion tube; look for any holes ( as in step 4 will show leaks). Check for wear, wrinkled, blistered, buckles etc. Be sure that IT is not impacted, loose and twists@boot! If buckled @ boot, or anywhere on tube, insertion tube will require replacement!...



10) Check angulation; refering to manufacturers specifications,using angulation chart; angulate endoscope. Example: CF-100L: Up: 180°, Down 180°, Right 160°, Left 160°. Endoscope should angulate smoothly with no play. If angulation is tight or doesn't angulate at all,play and angles will require adjustment or angulation wire replaced. If bending section bends irregularly or to one side, bending section mesh or articulating section will require replacement...

Angulation Problems
Are A Result Of:

  1. The angulation wires can stretch and break if the angulation is forced.
  2. Buckling of the insertion tube can also stretch and break wires.
  3. Play in the angulation control knobs usually indicate an angulation adjustment is needed.


11) Check Knobs, turn knobs back and forth. If they leak are loose or cracked. They will require replacement. If a grinding feeling is noticed on Pentax® or Fujinon®, drum wire will require replacement.



12) Check the Light guide tube (umbilical), and connector. Be sure there are no leaks,( as in step 4 will show leaks), buckles or wrinkled etc. Be sure connector has no loose parts, fluid in video connector etc. If it has a leak, buckled or impacted, replacement is required!


13) Observe the distal end, the "c-cover" distal and cap should be round and smooth. Check lenses, they shouldn't be cracked or dirty. Also the same for objective lens. Check Biopsy channel hole, should be round and smooth. If C-cover is impacted; cracked, will require replacement. If lenses are cracked, they will distort light and will require replacement. If biopsy channel is cut with laser, c-cover or channel will require repair.


14) Duodenoscopes: Elevator wire check. With forcep down channel and pointing out of distal end approximately 1 inch, move Control arm lever, forcep should move up and down at distal end and observing image, should come into field of view at manufacturers specifications. If lever doesn't move elevator wire or is tight or stuck, elevator wire or lever assembly must be repaired or replaced. 



Q: How often should endoscopes be checked for maintenance? Are there generally blatant signs when a scope is not working properly and should be checked?

A: Scopes should be leak tested after every procedure and before disinfection. The most effective leak test is to submerse the entire scope and follow orignial equipment manufacturer (OEM) instructions. If a leak is detected, the scope needs to be sent in for repair immediately. Scopes should be checked for maintenance on a weekly, monthly, or quarterly basis depending on the number of scopes used and procedures performed.

There are blatant signs that a scope should be checked. One of the most common is when a video scope starts taking pictures by itself, or when it will not take pictures. Usually this is a sign of fluid invasion. The fluid has entered the video switch block controls and the scope needs to be sent in for repair immediately. If a picture is cloudy on a video scope, users should look for a buildup of gluteraldehyde on the distal lens. If there is a buildup or debris on the lens, clean the lens with a rubbing alcohol wipe. If there is no buildup or debris on the lens, the video scope probably has fluid in the distal end. The scope needs to be sent in for repair immediately.

If a fiber optic scope is cloudy, look for a buildup of gluteraldehyde or debris on the distal lenses. If there is no buildup or debris, look for fluid in the eyepiece and distal lenses. If there is any sign of fluid, send the scope in for repair immediately.

Other signs are clicking and/or sluggishness in the angulation controls, significant movement of the insertion tube when angulating the distal end, poor light transmission, color fluctuations in the video image, blockage or friction when passing a brush through the biopsy and/or suction channel, poor water and/or air flow, poor suction and tears or significant dents in the insertion or light guide tube. Users should call their repair company and/or sales representative for inspection and/or advice.

Another sign is fluid in the water resistant cap when it is removed after the disinfection process. If fluid is present, redo the leak test. If the leak test is negative, more than likely the water-resistant cap is not so water resistant. Leak test the water resistant cap.

Scopes should be checked for rough edges, sharp nozzles, and cracking/deteriorating glue as all of the above can pose a significant risk to patient safety.

Q: What are the most common repairs made to endoscopes?



Air/Water nozzle unclog and/or replacement


Bending rubber replacement


Angulation adjustment


Biopsy channel replacement


Suction channel replacement


Minor fluid invasion (typically the OEM deems fluid invasion to require a major overhaul).


Major fluid invasion

Q: What services should endosuite managers be looking for in a company that offers to repair scopes?

A: Honesty, , and customer service! Scope repair companies should be able to tell you why a repair is necessary. Test your repair company. Tell them you suspect a scope has a major fluid invasion, send it in for repair and see what they quote. If you are going to experience the cost savings of using an independent service organization, they must be honest. is equal to honesty. Check out the of their replacement parts. Without , pricing and turnaround time mean nothing. Last but of great importance as well is customer service. Everybody makes a mistake once in a while. How does the lab honor a warranty? Do they continually look for reasons to charge more money for their mistakes? The following are a couple good questions to ask:


Who does the repairs?


Where do the repair technicians receive their training? It is good practice to know who is actually doing the repairs. This allows the endosuite managers to speak directly with technicians in case of immediate need for communication.


How are the technicians paid? Do they receive a percentage of their billings? *What is their turnover?

What parts are used in the repair process? Specifically, what type of bending rubber glue is used? Some companies use glues.


What type of replacement biopsy channels are used? Ask to see the biopsy channel. Some of the biopsy channels being used are high but some are of very poor . Variations in can cause premature kinking and are more susceptible to puncture via biopsy forceps or cleaning brush.


What type of replacement suction channel is used? Ask to see the suction channel. Is there a spring wrap at each end of the suction channel to avoid premature kinking? Check out the of Teflon used in the channel. Variations in can cause premature kinking and possibly more susceptible to puncture from a cleaning brush.


What is the process for repairing the bending section mesh covering the bending section? Ask to see the mesh and the different sizes available. Is the mesh replaced or is Teflon tape used to bandage the mesh? Teflon tape can affect the movement of the bending section that can cause a variety of problems.


What type of replacement insertion tubes are used? Is the insertion tube manufactured with a dual opposing flat coil spring? If the insertion tube is overly Flexible Endoscope or flimsy, it may have one flat coil spring. This can cause a variety of mechanical problems as well as physician complaints of the scope being too Flexible Endoscope . Does the coating hold up against cleaning and disinfecting? If the insertion tube is not coated/protected properly, the insertion tubes can prematurely leak, split open, and/or buckle. The same questions apply for the light guide tube.


Does the company support the recoating and/or retubing of insertion tubes? Metal components of the insertion tube tend to wear with use. If the tube is recoated toward the end of the insertion tube life cycle, mechanical problems may develop. This defeats the investment of the repair.


What type of replacement light guide lenses are used? Ask to see the light guide lenses. Is the entire assembly replaced or is the top lens replaced or is optical glue used to replace the lens. Poor lenses and/or repair can cause the light to spray improperly producing a dark image while inside the patient. This can be construed as a bad video chip.


Does the company repair video chips? Ask to see the video chip. If they repair the video chip, ask about the process. Ask about the warranty?


Loaners! Does the company provide loaners? Ask to see their loaner inventory. Ask about the availability of loaners.


Ask to see their repair facility. Meet the technicians. Meet the repair staff. Ask as many questions as possible. A good repair company has nothing to hide!


Ask about the number of repair technicians and the number of scopes repaired.


Ask about the number of customers they have in the market place. Sometimes more means less. Repairs take time. The larger the volume of scopes being repaired may mean there is less time spent on each scope repair to insure high .

Q: Are some scopes more fragile than others? Are there any brands known within the industry that generally require more repair than others?

A: Small diameter fiber optic scopes are more fragile than other scopes.

Special protection should be used during storage and transport.

Each brand of scopes has advantages and disadvantages. For liability reasons, We cannot mention a particular OEM, but managers should look into the warranty and what kind of support they will receive after the purchase. If they are buying used equipment, make sure the company has their own repair capabilities. Some scopes are made to last and others are what we call resposable scopes. They are not made to be worked on. Once they break they typically require a major overhaul by the OEM. This defeats the purpose of buying a less expensive scope.

Q: If a scope is treated ideally, how long is the expected lifespan? How long should endonurses and technicians expect to be able to trust a scope that has been repaired before worrying about sending it in again?

A: Ideally a scope can last quite a long time but the life span depends upon the number of procedures and the number of scopes used to perform those procedures. Obviously an account with a sufficient number of scopes to meet the procedure volume will experience a greater life span. The lifespan also depends upon proper handling, use, care, and maintenance.

A scope is typically not sent in for repair until it develops a problem. Obviously a scope repaired with parts and workmanship will last much longer than a scope repaired with low parts and poor workmanship.

Q: How should scopes be treated to prevent excessive repair bills?

A: Scopes should be treated according to OEM specifications. Most nurses and technicians do an excellent job in the handling of endoscopes. We recommend having dedicated cleaning personnel. This avoids the number of people involved in the handling process. Fewer people involved can reduce excessive repair expenses. Dedicated cleaning personnel can reduce repair bills by routinely performing proper cleaning and disinfection procedures as proscribed by the OEM. Familiarity with the scopes can prevent damage before it occurs. A technician familiar with the scopes can usually notice buckles or kinks in the channels and other signs as listed above that if detected would be a minor repair charge. Leak testing is by far the most important step in reducing repair expenses.










Handle should open jaws cleanly and smoothly. If jaws are locked shut, repair of jaws is required. If Handle broken, replacement required.
Observe coil pipe, they should be smooth and straight. If bent or twisted, coil pipe replacement is required.



Observe eyepiece section. If dropped and damaged, eyepiece will require repair.

Observe image, should be crystal clear. If foggy or any specs of dust or dirt, repair required: ( Eyepiece, rod lens, objective ).


Observe image, it should be crystal clear. If distorted or no image, repair required: ( Eyepiece, rod lens, objective ).

( chipped Rod lens )

Externally view distal tip of endoscope, check objective system. If impacted and damaged at tip, repair required. ( Objective system ).

Inspect the metal shaft of rigid endoscope, it should be straight. If impacted, bent and damaged at tip, repair required. ( Straighten or replace shaft, rod lenses, possible refiber ).


Point the tip at a light, observe light post of rigid endoscope, it should be round and bright with less than 5% broken fibers. If more than 5% it will require re-fibering.


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* Inspection procedures are industry wide inspection tests. They may not be Manufacturers recommended inspection procedures.



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