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small curved canula the size of a syringe needle used to introduce fluids or drugs into the nasolacrimal passage to test its patency or during surgery (dacrocystography, dacrocystectomy, dacryocystorhinostomy(DCR), etc. Lang's lacrimal dissector with scoop: for blunt dissections and cleaning during operations like dacryocystorhinostomy: Rougine
The OVD is introduced into the space by syringe through a cannula. [2] At the end of the procedure they are removed by aspiration and the space filled with a compatible fluid such as a buffered saline solution. [3] OVDs are commonly used in cataract, cornea, glaucoma, eye trauma, and vitreoretinal surgery. [1]
The needle is inserted at this point and about 4 ml of local anaesthetic is injected while withdrawing the needle. Pain at the injection site may occur if O' Brien's block is applied. [3] Atkinson's block : The superior branch of the facial nerve is blocked by injecting the anaesthetic solution at the inferior margin of zygomatic bone.
Cataract surgery by “couching” (lens depression) is one of the oldest surgical procedures. The technique involves using a sharp instrument to push the cloudy lens to the bottom of the eye. Perhaps this procedure is that which is mentioned in the articles of the Code of Hammurabi (ca. 1792–1750 BC) though it is a mere speculation.
In this procedure aqueous humor from the anterior chamber of eyeball is drained out by using a tuberculin syringe, with or without a plunger attached to a hypodermic needle or a paracentesis incision. [1] Eye is anesthetized using proparacaine or tetracaine eye drops prior to ACP. [5] Paracentesis is performed through the clear cornea adjacent ...
A dose-sparing syringe and needle being used to draw up a COVID-19 vaccine. A dose-sparing syringe is one which minimises the amount of liquid remaining in the barrel after the plunger has been depressed. These syringes feature a combined needle and syringe, and a protrusion on the face of the plunger to expel liquid from the needle hub.
Intravitreal injection is the method of administration of drugs into the eye by injection with a fine needle. The medication will be directly applied into the vitreous humor. [1] It is used to treat various eye diseases, such as age-related macular degeneration (AMD), diabetic retinopathy, and infections inside the eye such as endophthalmitis. [1]
The ski and canoe needle design allows curved needles to be straight enough to be used in laparoscopic surgery, where instruments are inserted into the abdominal cavity through narrow cannulas. Needles may also be classified by their point geometry; examples include: taper (needle body is round and tapers smoothly to a point)