User's Manual

Video Otoscope

AMD-300S (Welch Allyn / AMD)

Document ID: PUB-112

Revision B

User's Manual Video Otoscope AMD-300S

The names of any providers and patients used in illustrations or examples in this document are fictitious.

Every effort has been made to ensure this manual is accurate, complete, and useful. Please let us know if you have any suggestions for improvement using one of the following means of contact:

AFHCAN

Training Department

4000 Ambassador Drive

Anchorage, AK 99508

Phone: 877 885-5672

Fax: 907 729-2269

Email: [email protected]

Copyright © 2006 Alaska Native Tribal Health Consortium (ANTHC). All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form, or by any means, including photocopying, electronic, mechanical, recording or otherwise, without the prior written permission of Alaska Native Tribal Health Consortium.

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Table of Contents

Section Title Page

Preface ............................................................................................................................................ v

About this Document .................................................................................................................. v

Related Documents ..................................................................................................................... v

For More Information ................................................................................................................. v

Section 1 – Introduction ................................................................................................................ 1

1.1 Introduction to the Video Otoscope ..................................................................................... 1

1.1.1 Functional Description .................................................................................................. 1

1.1.2 Main Components ......................................................................................................... 1

1.1.3 Hardware Features ........................................................................................................ 4

1.1.3.1 Platform Box ......................................................................................................... 4

1.1.3.2 Ear Scope Assembly .............................................................................................. 5

1.1.4 Video Otoscope Features in the AFHCAN Software ................................................... 6

1.2 Particulars of the AFHCAN Installation .............................................................................. 7

1.3 Warnings and Cautions ........................................................................................................ 8

Section 2 – Operation .................................................................................................................... 9

2.1 Basic Operating Procedures ................................................................................................. 9

2.1.1 Start the Software ......................................................................................................... 9

2.1.2 Ensure the Ear Scope Tip Is Clean ............................................................................. 10

2.1.3 Perform Color Reset Adjustment ................................................................................ 10

2.1.4 Use the Focus Tool ..................................................................................................... 11

2.1.5 Verify Camera Orientation (White Dot Position) ....................................................... 12

2.1.6 Capture Images Into a Case ........................................................................................ 13

2.1.7 When Finished with a Patient ..................................................................................... 15

2.2 Special Procedures ............................................................................................................. 15

2.2.1 Using the Insufflation Bulb......................................................................................... 15

Section 3 – Clinical Considerations ............................................................................................ 17

3.1 Guidelines for Clinical Success ......................................................................................... 17

3.2 Common Mistakes ............................................................................................................. 17

3.3 Tips and Tricks .................................................................................................................. 17

Section 4 – Routine Maintenance ............................................................................................... 19

4.1 Care and Cleaning .............................................................................................................. 19

4.2 Replacement Items ............................................................................................................. 19

4.2.1 Replacing the Lamp .................................................................................................... 19

4.2.2 Checking and Replacing the Fuses ............................................................................. 22

4.3 Elementary Troubleshooting .............................................................................................. 23

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List of Illustrations

Figure Title Page

2 Cables and connectors ......................................................................................................... 3

3 Ear scope assembly ............................................................................................................. 4

4 Example of the Video Picture screen .................................................................................. 6

5 Correct way to hang the ear scope assembly on its hook .................................................... 8

6 Initial screen when using the video otoscope ...................................................................... 9

7 Focus tool mounted on barrel ............................................................................................ 11

8 Sequence of screen shots showing degrees of focus ......................................................... 12

10 Three ways to capture an image ........................................................................................ 14

11 Removing the lamp replacement door ............................................................................... 20

12 Lamp retaining spring ....................................................................................................... 20

13 Lamp correctly seated with alignment tab in notch ........................................................... 21

14 Removing the fuse drawer ................................................................................................. 22

List of Tables

Table Title Page

1 Functions of Video Picture screen buttons .......................................................................... 7

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Preface

About this Document

This document is part of the set of user manuals provided with the AFHCAN Cart. These user manuals, covering various topics, are normally assembled into a binder delivered with each Cart.

This modular design has the following advantages:

• the set of manuals provided with your cart includes documents for the specific peripheral devices installed

• each document is a stand-alone publication, so as new devices or features are added to the

Cart, new manuals can be added to the existing binder

• user information that is common to all items of equipment does not need to be repeated in each module, but can be covered in separate modules and referenced as needed

Related Documents

This document assumes you have read the introductory hardware and software manuals included in this binder.

The original manuals provided with the equipment were included in a set of materials delivered with the AFHCAN Cart. Those manuals can be used to supplement the information provided in this document. Be aware, however, that items installed on an AFHCAN Cart may have been modified slightly, so the features as described in the original product manuals may not apply.

For More Information

This document describes the equipment to a level of detail that will meet most user's needs in the context of clinical use of the AFHCAN Cart. For more information, contact AFHCAN Customer

Support:

AFHCAN Customer Support

Phone: 888 449-4435

Fax: 907 729-2269 email: [email protected]

You can also view additional information at the manufacturer's website:

www.welchallyn.com/medical/ www.amdtelemedicine.com/

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Section 1 – Introduction

1.1 Introduction to the Video Otoscope

This manual describes the principal features and operation of the AMD-300S video otoscope, as installed on an AFHCAN Cart.

1.1.1 Functional Description

The video otoscope combines an otoscope with a digital imaging system to produce high-quality, video images that can be displayed on a monitor. The video output from the video otoscope is brought into the computer. The live video feed is displayed on the touchscreen monitor allowing the healthcare provider to position the instrument to obtain the desired view. Images from the video input can then be captured and saved in a case as digital photographs.

1.1.2 Main Components

The video otoscope system consists of the following main components (Figures 1 through 3):

• Platform Box (sometimes called a "light box")

The platform box contains the light source, digital imaging electronics, and power supply

• cable assembly

The cable assembly is a pair of cables bundled together in a Teflon sheath:

- fiber optic bundle

The fiber optic bundle is a cable that conducts light from the light source in the platform box to the ear scope

- camera and camera cable

The camera cable includes a CCD camera head, wiring, and a multi-pin connector that plugs into the platform box

• ear scope assembly

The ear scope assembly is the hand-held unit brought to the patient's ear

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Figure 1

Platform box

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Figure 2

Cables and connectors

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Figure 3

Ear scope assembly

1.1.3 Hardware Features

1.1.3.1 Platform Box

The platform box includes the following items:

• Power Switch

The power switch turns the platform box on (1) or off (0)

Caution: never turn the power switch off then on in quick succession.

Once the unit is turned off, wait at least 15 seconds before turning it back on. Otherwise the lamp may fail to reignite, and lamp life will be shortened.

• Color Reset button (white balance) and LED indicator light

Pressing and holding the Color Reset button activates electronics in the platform box that perform color adjustments based on a pure white image when the

Color Reset

button is pushed, the LED indicator beside the button will flicker a few times indicating that the Color Reset adjustment is in progress; when the flashing stops, the

Color Reset

button can be released

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•

Image Enhance

button and LED indicator light pressing the

Image Enhance

button activates image enhancement circuitry in the platform box and sharpens the image when lit, the LED indicator light beside the

Image Enhance

button indicates the image enhancement circuitry has been turned on

• Light Intensity Control Knob the Light Intensity Control Knob adjusts the amount of light delivered to the tip of the ear scope, with clockwise rotation increasing light intensity and stops at maximum and minimum settings the knob does not change the intensity of the lamp, but opens or closes an aperture between the lamp and the fiber-optic bundle for most viewing situations, maximum intensity is best

• Camera Connector Port the camera connector port provides the electrical connection for signals coming from the camera head when plugged into the camera connector port, the connector on the camera cable must be oriented with the red dot up (tabs in the connector will physically prevent misalignment)

• Fiber Optic Illumination Port the fiber optic illumination port provides a connection point for one end of the fiber optic bundle

• fuse drawer the fuse drawer, located above the power cord, allows the power supply fuse to be pulled out, visually checked, and replaced if necessary (2.0 ampere, 250 volt, 5 mm by 20 mm,

Fast Blo, Welch Allyn part number VA303 or equivalent)

• lamp replacement door the lamp replacement door allows the user to access and replace the lamp which is the light source for the otoscope (Welch Allyn part number 09500)

1.1.3.2 Ear Scope Assembly

The ear scope assembly consists of the following items:

• ear scope the ear scope is the component actually inserted into the ear consisting of a tip, a barrel, a light source connector, and a viewing end

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• optical coupler the optical coupler consists of a set of lenses, a focusing ring, a threaded connection for attaching to the camera head, spring-loaded flanges for securing the ear scope, and a set screw to keep the ear scope from rotating in relation to the camera

• camera head the camera head is part of the camera cable assembly that contains the digital imaging chip (CCD imager) and connects to the optical coupler

• light post adapter the light post adapter comes off of the ear scope barrel at a right angle and includes a swivel adapter which connects the fiber optic bundle to the instrument as well as a small port where an insufflation bulb can be attached

1.1.4 Video Otoscope Features in the AFHCAN Software

The features of the AFHCAN software that are unique to the video otoscope are contained on a single screen, the Video Picture screen (see Figure 4), where otoscope images are captured and saved. Once the image has been saved to the case, it can be viewed using the image viewing tools available on the Case screen.

It is possible to select the

Video Otoscope

button and open the Video Picture screen without identifying a patient. This may be useful when demonstrating the equipment.

Figure 4

Example of the Video Picture screen

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Table 1 describes the functions of the buttons in the right bar area.

Table 1

Functions of Video Picture screen buttons

Button Function

Captures the image currently in the central viewing area as a new image, and creates a thumbnail of that image. The image in the central viewing area may be a live image, a frozen image, or even one of the existing images brought up for viewing. After an image has been captured, the system returns to a live image in the central viewing area.

Switches the image displayed in the central viewing area to the live video feed from the otoscope. When the image is live, there will be a steady white border around the central viewing area.

Temporarily freezes the image in the central viewing area so it can be examined. When the image is frozen, the border around the central viewing area will flash red and white. A frozen image can then be captured by pressing the Take Picture button. A live video feed from the otoscope can be brought up in the central viewing area by pressing the Live button.

The Rotate button works only when a thumbnail image has been selected for viewing. Each time the Rotate button is pushed, the image is rotated 90 degrees clockwise. The rotated version of the image is what will be saved in the case.

Saves all the images with a green checkmark and a name into the case, and goes to the Case screen.

Returns to the Add To Case screen. If images have been captured, a message will appear advising that images will be lost and inviting you to confirm your decision.

1.2 Particulars of the AFHCAN Installation

The video otoscope is securely attached to the AFHCAN cart. The Platform Box is affixed to the top shelf by means of Velcro. The Platform Box can be removed for maintenance (for example, lamp replacement, refer to Section 4). The fiber optic bundle and camera cable are fed through a

Teflon sheath that holds the cables together as an assembly. The cable assembly is clamped to the cart. The power cable is routed to a power outlet in the lower compartment, and the S-video cable is routed to a video capture card in the computer. The power and video cables are incorporated in the Cart's cable management hardware.

The AFHCAN Cart is not intended for use in a sterile environment, so a soaking cap normally included with the camera cable may have been removed. While the light source and camera head can theoretically be attached to other types of endoscopes, the sterilization requirements associated with other endoscopes makes their use on the AFHCAN Cart impractical.

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1.3 Warnings and Cautions

Please observe the following points:

• This manual is intended for clinically trained medical staff using the AFHCAN Cart. All procedures assume the user understands and determines when the procedures described here are appropriate and when they are contraindicated. Clinical tips are provided as a supplement to your training and are provided to help you succeed in using this equipment.

• Never turn the Platform Box off and on in rapid succession. Wait at least 15 seconds after turning the power off before turning power back on. If power is turned on too soon, the lamp may not ignite properly, and lamp life will be diminished.

• If the power is left on between patients, turn the Light Intensity Adjustment Knob fully counter-clockwise (minimum intensity). This simply reduces a potentially annoying or distracting source of very bright light in the work area.

• Avoid touching the silvery finish on the back of the new lamp or the glass on the front of the lamp because body oils will degrade the lamp performance. Always handle the lamp by its ceramic base.

• Do not unscrew the optical coupler from the camera head because this creates an opportunity for moisture or dirt to get into this area.

• Avoid crimping or crushing the fiber-optic cable and camera cable.

• Do not drop or bang the ear scope assembly because the optical elements are glass.

• Place the ear scope assembly on its hook so it does not put stress on the extension for the fiber optic bundle (Figure 5).

Figure 5

Correct way to hang the ear scope assembly on its hook

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Section 2 – Operation

2.1 Basic Operating Procedures

Refer to Section 1.1 for descriptions and illustrations of the controls, indicators, and other items referenced in these procedures.

2.1.1 Start the Software

Log in to the software, if necessary, and proceed as follows:

* the

Create a New Case

button.

2. Select real or test case, as appropriate. the

Video Otoscope

button.

A screen similar to the one in Figure 6 will show up.

Figure 6

Initial screen when using the video otoscope

*

Refer to the Software User's Manual for background information on using the software.

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2.1.2 Ensure the Ear Scope Tip Is Clean

The following steps should be performed each time the otoscope is used:

Caution: never turn the otoscope off and on in quick succession.

Whenever you turn the otoscope off, wait at least 15 seconds before turning it back on again. Otherwise the lamp may fail to illuminate properly, and the life of the lamp will be shortened.

1. Turn the otoscope light box on and set the intensity adjustment to maximum (turn the Light

Intensity Control Knob fully clockwise). As the lamp warms up, light will be visible through the vents located below the Light Intensity Control Knob.

2. If a speculum is attached, remove it and discard (presumably it has been used).

3. Use an alcohol prep pad to clean any wax, oil, or other material from the tip.

4. Attach the insufflation bulb, aim the barrel downward, and blow through the tip a number of times to dry the alcohol (spray may be visible against a dark background).

2.1.3 Perform Color Reset Adjustment

Perform a Color Reset adjustment (also known as white balance) in the following circumstances:

• at least once each week

• after a lamp is replaced

• any time there is a question about good color fidelity of the image

Proceed as follows:

1. Ensure the Light Intensity Control Knob is fully clockwise (maximum intensity).

2. Place a piece of pure white paper on any convenient work surface.

3. Aim the light at the paper holding the ear scope tip between 1/2 inch to 1 inch away from it.

4. Holding the ear scope steady, push and hold the Color Reset button. The LED indicator light next to the Color Reset button will flash a few times while the electronics are working.

After a moment, the flashing will stop indicating that white balance is complete.

5. Release the Color Reset button.

Note: if the white balance adjustment is correct to begin with, the

LED indicator next to the Color Reset button will not flash at all. To verify operation of the Color Reset button, you can first perform the white balance adjustment using a target that is not white, then repeat with a white target. By using a non-white target first, it forces the white-balance processing to take place.

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2.1.4 Use the Focus Tool

AFHCAN has designed a focus tool to assist in focusing the ear scope (Figure 7). The focus tool is included in the supplies drawer on the Cart. Using the focus tool provides a starting point for a good focus distance that will work in most situations.

Note: if a focus tool is not available, adjust the focus by holding the

tip about 1/2 inch away from a paper with some printing on it.

Figure 7

Focus tool mounted on barrel

To focus with the focus tool, proceed as follows:

1. Ensure the LED indicator light next to the Image Enhance button is off. If it is on, push the

Image Enhance button to turn the image enhancement function off.

2. Insert the barrel of the ear scope into the focus tool as far as it will go (this will not work with a speculum attached).

3. View the image on the screen (if the image border is flashing red, push the

Live

button and rotate the focus tool to verify you have a live image).

4. Slowly rotate the focus ring back and forth to zero in on the clearest possible image.

Note: to verify focusing was done, you can add the focused image to

the case, as described in Section 2.1.5 below.

5. Push the Image Enhance button to turn on image enhancement (the LED indicator light beside the Image Enhance button will come on). The on-screen image will sharpen dramatically.

6. Remove the focus tool from the ear scope.

Figure 8 shows a sequence of images showing unfocused, focused, and enhanced images of the focus tool.

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Figure 8

Sequence of screen shots showing degrees of focus

2.1.5 Verify Camera Orientation (White Dot Position)

There is a white dot on the camera head that indicates "up" with reference to the digital image.

When dealing with a circular image, it is important handle the instrument so "up" inside the ear canal corresponds with "up" on the displayed image. Normally the ear scope is assembled so the white dot is on the opposite side from where the light cable enters the ear scope. Gravity will tend to orient the ear scope so the light cable is hanging straight down, which would position the white dot on top. If the patient is not sitting up, for example, it may be helpful to rotate the camera head so the white dot is in a more convenient orientation.

Note: The image can also be rotated in 90-degree increments in the

image viewer of the AFHCAN software.

Figure 9 illustrates how the white dot determines the frame of reference for "up" on the image. In this example, the white dot (top of camera) is rotated 90 degrees to the left with respect to the ear scope barrel and fiber optic bundle. As a result, the image appears on the screen rotated 90 degrees to the right.

To reposition the white dot, proceed as follows:

1. Loosen the set screw on the optical coupler.

2. Rotate the ear scope in relation to the optical coupler and camera head to the desired orientation.

Note: Normally the white dot will be on the opposite side of the fiber

optic cable.

3. Tighten the set screw on the optical coupler.

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Figure 9

Relationship between image up and the white dot

2.1.6 Capture Images Into a Case

At this point a series of otoscope images can be captured, named, reviewed, and saved into a case.

Refer to Section 3 for clinical tips on handling patients and obtaining good results. The procedure is as follows:

1. Attach a clean speculum of the proper size (the diameter as measured at the tip):

- 2.5 mm for children

- 4.0 mm for adults

Note: the speculum attaches to the ear scope by screwing it on a

quarter turn.

2. Ensure you have a live image on screen by moving something in front of the ear scope

(such as your fingers). If the image appears frozen or the image border is flashing red, press the

Live

button.

Note: in the next steps, to capture the video input as a still image, you

must signal the computer to capture the image. There are three ways to capture an image on the AFHCAN Cart, as shown in Figure 10.

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Figure 10

Three ways to capture an image

As a way to involve the patient, consider letting them hold the hand switch and take the image on your instructions. Images taken accidentally need not be saved into the case.

3. Place the hand switch or the foot switch in a convenient location.

4. Position the patient and yourself so you can watch the on-screen image.

5. Guide the ear scope into the patient's ear until the tympanic membrane is in full view (refer to Section 3 for tips on dealing with wax as well as other recommendations for handling the instrument).

6. When satisfied with the image, capture it by pressing

Take Picture

button, or by pressing the hand switch or the foot switch. As each image is taken, a thumbnail of the image is added in the left bar area of the screen.

Note: a series of images can be captured.

7. To save an image, it must be named and checked. Click on the thumbnail. The selected thumbnail image will have a yellow border, a full-size version of the image will be displayed in the image viewing area, and a data entry box will open up for naming the image, as shown in Figure 4 (Section 1.1.4). Enter a name and select the next thumbnail image.

8. Once you have determined which images to keep, ensure those images are named and checked, and press the

Save

button. Any images that were not checked will be discarded, the desired images will be saved into the case, and the software will bring up the Case screen.

9. Additional otoscope images can be added to a case by returning to the Add To Case screen.

From the Case screen, press the

Add To Case

button, and then press the

Video Otoscope

button.

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2.1.7 When Finished with a Patient

The following steps should be performed at the conclusion of each clinical use:

1. Remove and discard the speculum.

2. Attach the insufflation bulb.

3. Clean the tip with an alcohol pad, aim the barrel downward, and blow the tip dry with the insufflation bulb.

4. If the otoscope is not likely to be used again within the next 45 minutes, set the power switch on the Light Box to 0 (off).

Note: if the otoscope will be used for a number of patients, it is okay

to leave the otoscope powered up. When not in actual use, it is a good practice to turn the Light Intensity Adjustment Knob fully counterclockwise (minimum intensity).

2.2 Special Procedures

2.2.1 Using the Insufflation Bulb

In the AFHCAN installation, the primary use for the insufflation bulb is to assist in cleaning and drying the tip of the otoscope. However, the insufflation bulb can also be used clinically for observing the flexibility of the tympanic membrane. Using the insufflation bulb for this purpose requires the use of a rubberized speculum sized for the patient's ear canal. These items are not supplied by AFHCAN, and a description of this clinical practice is beyond the scope of this manual.

If a typmanometer is attached to the cart, then that device would be the preferred way to measure the flexibility of the tympanic membrane. The typmanometer provides numerical data that is incorporated into a case as a graph.

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Section 3 – Clinical Considerations

These pointers are to be used as a supplement to your clinical experience.

3.1 Guidelines for Clinical Success

Characteristics of a good image:

• clear, sharply focused

• tympanic membrane in center, filling most of available image area

• good color fidelity

• up on the image reflects up on patient's ear

Good practices:

• obtain images and data from both ears for the sake of comparison, and include left and right in image name

• name images with helpful information

• straighten ear canal by pulling pinna up and back for most adults, back for most children

3.2 Common Mistakes

Poor quality images are often the result of the following:

• poor focus

• uncentered image

• scope not parallel with ear canal

• tip not in far enough

• white dot on camera head not up in relation to the patient's ear

3.3 Tips and Tricks

You may find the following pointers helpful:

• do not irrigate painful, bleeding, or draining ears

• do not irrigate an ear with known tubes unless instructed to do so

• if wax is present, try to look around it

• it may be necessary to remove wax

• toddlers and babies need to be restrained, have a parent or other adult assist

• keep the patient interested in the procedure by allowing him or her to watch the on-screen video and assist in capturing the image

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Section 4 – Routine Maintenance

4.1 Care and Cleaning

The following are basic cleaning activities:

• Before and after each patient, clean any oils or wax from the tip of the ear scope with an alcohol prep pad (speculum removed). Aim the ear scope down and blow the tip dry with the insufflation bulb.

• Use a vacuum to clean any dust from the equipment.

• Wipe down open surfaces with a clean damp (not wet) cloth as needed.

• Disinfect the hand switch with an alcohol prep pad.

4.2 Replacement Items

4.2.1 Replacing the Lamp

Note: before assuming the lamp is bad, run through the

troubleshooting checklist in Section 4.3 below.

The lamp used as a light source is a Welch Allyn product, part number 09500. To replace the lamp, proceed as follows:

1. On the Platform Box, turn power off and allow the lamp to cool.

2. Unplug all cables from the Platform Box, to include:

- S-video cable from back (pull straight out)

- power cable from back (pull straight out)

- fiber optics cable from front (pull straight out)

- camera cable from front (hold the knurled part of connector and pull straight out; pulling on knurled ring releases connector)

3. Carefully but firmly pry the Platform Box loose from the Velcro strips that secure it to the top shelf and set it upside down on a convenient work surface.

4. Using a small screw driver (or a coin), unscrew the retaining screw of the lamp replacement door and lift it off the Platform Box (see Figure 11).

Note: removing the old lamp and installing the new one involves a

certain amount of gentle "fiddling" to manipulate the retaining springs and move the lamp into or out of position.

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Figure 11

Removing the lamp replacement door

5. Using two fingers, pull the lamp retaining spring back away from the lamp (see Figure 12).

With your other hand, angle the lamp up so it can be slipped out from the circular pocket where it is normally seated.

Figure 12

Lamp retaining spring

6. Once the lamp has been freed, pull the plastic connector off the connector pins.

Caution: avoid touching the silvery finish on the back of the new

lamp because body oils will degrade the lamp performance. Always hold the lamp by its ceramic base.

7. Obtain a new lamp and find the alignment tab.

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8. Holding it by the ceramic base, and making sure the alignment tab goes into the notch

(Figure 13), pull the retaining springs back and slip the lamp into position in it's circular pocket.

Note: make sure the lamp is fully seated within the circular area.

When properly seated, the tab will be in its notch, and the connector pins will be at a slight upward angle.

Figure 13

Lamp correctly seated with alignment tab in notch

9. Push the connector onto the connector pins. The pins are different diameters, so the connector can only be installed one way.

10. Slide the plain end of the Lamp Replacement Door under the rim of the opening in the platform box.

11. Using small screw driver, tighten the retaining screw on the Lamp Replacement Door fully.

The Lamp Replacement Door must be fully closed and seated against the supporting parts.

12. Place the Platform Box on the top shelf making sure the Velcro strips reconnect.

13. Plug the cables into the Platform Box as follows:

- S-video cable: check alignment and plug straight in

- power cable: orient correctly and plug straight in

- fiber optic cable: push straight into connector in center of Light Intensity Adjustment

Knob

- camera cable: make sure red dot on connector is up and push straight into connector until it clicks

14. Apply power and verify operation.

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4.2.2 Checking and Replacing the Fuses

There are two fuses in the fuse drawer. These fuses are identical. Use Welch Allyn part number

VA303, or a commercially available fuse with the following specs:

2.0 amperes

250 volts

5 millimeter by 20 millimeter

Fast Blo

Once removed, the fuse element is visible inside the glass barrel of the fuse. If the fuse is good, the element will be visible as a continuous filament. If the fuse is blown, the element will be melted, and either will be completely gone or will have a distinct gap in the filament.

Replace a fuse as follows:

1. Turn off the video otoscope and disconnect the power cord from the back of the Platform

Box.

2. There are two retaining tabs, one on each side, that hold the fuse drawer in place. Using a small screw driver, press one retaining tab in and gently pry that side out a small amount

(see Figure 14). Repeat the process on the other side of the fuse drawer. Continue back and forth in this fashion until the fuse drawer is out far enough to pull with your fingers.

Figure 14

Removing the fuse drawer

3. Hold the fuse drawer up against a suitable background and inspect the fuse elements. If the fuse element is visible the entire length of the glass, and there are no apparent breaks or burn spots, the fuse is probably OK.

4. If an element appears to have blown, pull the fuse out and replace it.

5. Making sure the alignment tab is aligned with the slot, push the fuse drawer back into place until both retaining tabs click into position.

6. Plug the power cord back in and verify operation.

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4.3 Elementary Troubleshooting

Table 2 provides some general guidelines on troubleshooting the video otoscope. The Operating

Manual provided by AMD may also contain some useful troubleshooting information.

Table 2

Troubleshooting guidelines blurry image no image lamp not lit poor color fidelity

• wax, oil, or something else on tip; clean with alcohol prep pad

• out of focus; use focus tool

• patient moved when image was captured

• Image Enhancement button not pressed (LED indicator beside button not lit)

• water or fluid in the ear canal

• S-video cable disconnected from Platform Box

• power off

• power cable disconnected

• camera cable loose or disconnected

• power turned off then on in less than ten seconds; turn power off, allow lamp to cool for 15 seconds, then turn power on

• fuses blown

• bad lamp

• perform Color Reset (white balance) procedure

• problem with monitor or printer strange bluish color to image • ensure lamp has warmed up for at least 10 seconds before capturing image excessively bright spots in image

• may be caused by light from tip striking wall of ear canal; redirect tip to illuminate tympanic membrane grainy image spots on image

• Light Intensity Adjustment Knob may be set too low

(maximum intensity is normally used)

• fiber optics cable connector may not be fully seated or misaligned (in center of Light Intensity Adjustment Knob)

• in general, it should not be necessary to pull the ear scope assembly apart to clean the optics; on occasion, it may be possible for bits of dirt to get onto the lenses transmitting the image to the camera head; disconnect the optical coupler from the ear scope and camera head, and check and clean the lenses with high quality optical papers or cloths

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User's Manual Video Otoscope AMD-300S

PUB-112 Rev B.doc 24

add to case screen, 7, 9

AFHCAN cart, 7 software, 6 back button, 7

barrel release lever

image, 4 bulb. See insufflation bulb buttons function of, 7 cable assembly, 1 camera, 1 fiber optic bundle, 1 images, 3 camera, 1 cable, 1, 8 cable (image), 3 connector port (image), 2 head, 6 orientation, 12 camera connector port. See cleaning, 19 color reset adjustment intervals, 10 procedure, 10 color reset button, 4, 10 image, 2 connectors images, 3 cooling fan image, 2 create a new case button, 9 ear scope, 8 assembly, 5 assembly, 1 assembly (image), 4 cleaning, 9, 19 hook, 8 hook (image), 8 endoscopes, 7 fiber optic illumination port (image), 2 fiber optic bundle, 1, 8 image, 3, 4 fiber optic cable, 8 focus image, 11 ring, 5 ring (image), 3 tool, 11 tool (image), 11

PUB-112 Rev B.doc

Index

foot switch, 14 image, 14 freeze button, 7 functional description. See video otoscope: functional description fuse blown, 23 drawer, 22 drawer (image), 2 inspection, 22 replacement, 22 retaining tabs, 22 hand switch, 14 image, 14 hook. See ear scope image blurry, 23 capture, 14 characteristics of good images, 17 color, 10, 23 grainy, 23 name, 14 none, 23 rotation, 12 spots, 23 image enhance button, 5, 11 image, 2 insufflation bulb, 6, 10, 15 image, 4 lamp, 4 caution, 7 image, 2 not lit, 23 replacement, 19 replacement(image), 20 retaining spring, 19 retaining spring (image), 20 light box. See platform box light intensity adjustment knob, 15 light intensity control knob (image), 2 light intensity control knob, 5, 10 light post adapter, 6

Live button, 13

optic coupler, 5, 6, 8, 12

image, 4 platform box, 1, 4, 7, 21 caution, 8 image, 2 serial number (image), 2 power cable connector image, 2

25

User's Manual

power switch caution, 4, 8 image, 2 rotate button, 7 save button, 7 set screw, 12 software, 8 speculum, 15 sizes, 13 start screen, 9

S-video connection image, 2

Take picture button, 7 image, 14 tympanometer, 15 video capture card, 7 video otoscope button (image), 9 functional description, 1 video picture screen, 6 image, 6 white dot. See camera orientation

Video Otoscope AMD-300S

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