lacrimal canal implantation

Lacrimal duct implantation is suitable for severe destruction or extensive obstruction of the upper and lower lacrimal canal, and the lacrimal sac has been removed or the cystic cavity is too small. Treatment of diseases: chronic dacryocystitis Indication Lacrimal duct implantation is suitable for severe destruction or extensive obstruction of the upper and lower lacrimal canal, and the lacrimal sac has been removed or the cystic cavity is too small. Contraindications Inflammation of the conjunctiva, inflammation of the skin in the lacrimal sac area. Preoperative preparation The antibiotic droplets were immersed for 2 to 3 days, and the conjunctival sac was fully washed with physiological saline on the day of surgery. On the 16th, a dural puncture needle with a needle core was ground into a beveled surface and marked at a distance of 28, 32 and 36 mm from the needle end. Pure gold or titanium steel thin-walled tubes are 30, 32, 34 and 36 mm in length respectively, the outer diameter of the tube is 1.5 mm, and the outer diameter of the cap is 3 mm. Surgical procedure 1. Use a small knife tip to puncture the lower part of the tears. 2. The marked puncture needle is pierced horizontally by the lancet and gradually advances in the direction of the tears. After the needle reaches the lacrimal sac, the needle is turned to the vertical direction and slowly pushed down, and the nasolacrimal duct enters the lower nasal passage. . 3. Pull out the needle core and inject saline into the needle. If the salt water can flow smoothly into the nasal cavity, the position is correct. If the water flow is not smooth, lift the needle slightly or push it down until the water flow is smooth, and observe the mark on the needle. 4. Select the metal tube according to the length mark on the needle. When using it, first put the metal tube on the probe to make it have the proper curvature. 5. Insert the probe into the puncture needle and pull out the puncture needle to leave the probe. 6. Place the metal tube over the probe and follow the probe through the nasolacrimal duct to leave the needle cap on the teardrop. 7. Pull out the probe and inject the saline into the conjunctival sac. If it can flow into the nasal cavity quickly, the position of the metal tube is correct. Otherwise, it should be properly adjusted until the saline can smoothly enter the nasal cavity.

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