Corneal stroma injection needle

Abstract

The invention provides a corneal stroma injection needle which comprises a needle body, the needle body comprises a hollow needle tube body and a needle tip located at the front end, a movable supporting piece and a limiting piece are arranged on the needle tube body, and the limiting piece limits the distance between the supporting piece and the needle tip to be constant. Due to the fact that the tube diameter of the needle tube body at the position where the supporting piece is additionally arranged is increased, and the bottom face of the supporting piece is arc-shaped, the contact face of the supporting piece and the cornea of the eyeball is close to point contact when the supporting piece abuts against the cornea of the eyeball, an operator can conveniently observe and adjust the included angle between the needle tube body and the supporting piece, and it is guaranteed that the needle tube body can obliquely penetrate into the cornea. And the limiting piece is used for enabling the length from the supporting piece to the needle point to be a preset value before puncture, so that an operator can conveniently determine the initial position before needle insertion, and the needle insertion depth can be conveniently designed according to the inclination angle of the needle tube body.

Description

technical field [0001] The invention relates to the technical field of medical instruments, in particular to a corneal stroma injection needle. Background technique [0002] The cornea is a layer of transparent film at the front of the eye. It is mainly divided into five layers, namely the corneal epithelium, Bowman's membrane, stroma, Bowman's membrane and endothelial layer. Its total thickness is only about 550 μm, of which the stroma Layers account for most of the thickness. For patients with corneal diseases, it is usually necessary to apply drugs to the cornea in order to increase the local concentration of drugs in the cornea and alleviate the damage of the disease to the cornea to the greatest extent. At present, the treatment method of injecting drugs into the corneal stroma is a relatively direct and efficient treatment method for administering drugs to the cornea. It requires ophthalmologists to inject by piercing the injection needle into the corneal stroma under...

AI Technical Summary

Problems solved by technology

However, because the thickness of the corneal stroma is only about 550 μm, when using this replacement needle to insert the needle, the angle and depth of the needle's entry are completely controlled by the doctor's experience and feel. If the penetration depth is not enough, it will cause insufficient drug dosage or If the drug overflows, the accuracy of re-puncture is higher. If the puncture is too deep, it is easy to pierce the whole layer of the cornea, resulting in treatment failure.

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