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Common fault analysis and preventive measures of electronic endoscope

Released on Mar. 14, 2022

Electronic endoscope is a medical electronic optical instrument that can be inserted into human body cavity and visceral cavity for direct observation, diagnosis and treatment. It uses a very small electronic imaging element - CCD (Charge Coupled Device) to image the object in the cavity to be observed on the CCD through a tiny objective optical system, and then sends the received image signal to the image through the image guide fiber bundle. On the processing system, the processed image is finally output on the monitor for the doctor to observe and diagnose.

Common fault analysis and preventive measures of electronic endoscope:

1. Analysis and preventive measures of common faults in the apex bending part

(1) The lens cover glass is scratched, cracked, chipped, or covered with dirt, which will cause the monitor image to display blurry and black spots, which will affect the inspection and diagnosis of the disease. If there are scratches, cracks or gaps, stop using it; if it is covered with dirt, wipe it with a soft gauze dipped in cleaning solution before use.

(2) The water supply/air supply nozzle is blocked by mucus and foreign matter, resulting in poor water supply and air supply, affecting the use of the mirror. Method: Keep the air supply state during suction, and then supply water and air again after suction to ensure that there is no residual liquid in the pipeline and the mirror surface is clean.

(3) The surface of the bending part is covered with a thin layer of rubber, which has a certain elasticity to ensure easy operation of the bending angle. The bending rubber may be wrinkled, damaged, pinholes, overlapping and other faults, making the mirror unusable, and causing the mirror to leak Avoid premature aging and swelling of the curved rubber.

2. Common fault analysis and preventive measures of the insertion part

(1) The outer skin of the insertion tube appears yellowing, aging, crystallization, etc. The main reason is that the human mucus and protein on the mirror are not wiped off in time after the patient is examined. After such substances crystallize, the insertion tube will turn yellow and hard. . The preventive measures are mainly to clean the surface stolen goods in time after inspection, soak them in enzyme solution first, and then rinse them with clean water.

(2) Pinholes, breakages, and wrinkles appear in the insertion tube coil. The main reasons for such phenomena are the collision between the insertion tube and sharp objects, the angle is too small when cleaning the coil, the patient's mouth pad falls off, the mirror body is bitten by the patient, and the mirror body is bitten by the patient. Clamped etc. during placement. The main preventive measures are to hold the mirror, and the angle of the coil should not be too small when cleaning, and beware of collision with sharp objects, being caught, and the mirror body being bitten by the patient.

(3) The light guide light guide inside the insertion tube is dim, yellow or no light guide, and black spots appear on the image guide beam guide image, mainly because the insertion tube is folded too much, squeezed, collided, clamped, bitten by the patient Injuries, etc., cause a part of the optical fiber of the light guide and the image guide bundle to be broken. The precautions are the same as in (2).

(4) The pliers pipe is also located inside the insertion tube, which is mainly used for biopsy forceps, foreign body forceps, etc. to pass through it. The main fault is that the pipe wall of the pliers has pinholes, cracks and other damages, which cause water leakage inside the mirror, thus causing the electrical part inside the mirror. Short circuit, in severe cases, will cause the CCD to burn out. The main reason for such failures is that when the bending angle is too large, the accessories are passed through, and the needle, biopsy forceps and foreign body forceps are released in the forceps channel. Precautionary measures include: passing the accessory through the forceps tube when the apex bend is relaxed; releasing the needle after the accessory protrudes out of the forceps opening; closing the biopsy forceps before inserting and pulling out; using a no-problematic biopsy forceps; and doing leak testing before use.

3. Analysis of common faults in the operation department and preventive measures

(1) The control buttons and angle knobs leak water, which may cause water in the operation part and electrical short circuit. The common cause of failure is that the control button collides with sharp parts, or the button rubber is aging due to long-term use. Precautionary measures are mainly to handle with care, and do a good job of leak detection before use.

(2) The suction port is worn, and automatic suction will occur in severe cases. Although the suction volume is small, it directly results in insufficient air supply, which cannot completely fill the stomach and maintains a long-term aspirated state. The wrong way of pulling out the attachment often leads to the wear of the suction port. Strengthening the user's standard operation can avoid the occurrence of this failure.

(3) The angle wire is broken, which is mainly caused by excessive force when hitting the angle and exceeding the angle range. Normal operation and use can avoid this failure. When hitting the angle, the action should be gentle, so as not to hurt the patient, and secondly to protect the angle wire.

4. Common fault analysis and preventive measures of electrical connection

(1) Corrosion and rusting of the electrical connection port will cause abnormal phenomena such as image flickering and jittering, which will seriously damage the CCD. The main reason for this failure is that the electrical connection part is not covered with a waterproof cap during cleaning and disinfection, and the electrical connection port is connected to the image processing center when it is stained with water. The preventive measures are: cover the mirror with a waterproof cap when cleaning and disinfecting, and then wipe the mirror body with a dry cloth and dry the electrical interface points with an air gun.

(2) The electrical connector and the connector seat are forcefully embedded in the case that the bayonet is not aligned, causing the metal needle in the electrical connector to be broken, resulting in abnormal images or no image display. When electrical connection, press the corresponding position to clamp the interface to avoid this failure.