JPH06273702A - Contact lens having drug supplying capacity - Google Patents

Abstract

PURPOSE:To solve the pains of a patient who is forced to frequently drop a drug in his eyes and vorgetting applying the drug by inserting the drug worked into a sheet form between two sheets of hydrous soft contact lenses. CONSTITUTION:The drug 3 is eluted little by little into the moisture (including tear liquid) in the contact lens by forming the contact lens into a structure of fixing the drug between the hydrous soft contact lenses 1, 2 thereby the drug is sufficiently supplied over a long period of time. Namely, the direct contact of the drug 3 with the fine tissues, such as cornea, does not arise and moreover, the elution of the drug into the moisture is utilized and, therefore, the safe and sufficient supply of the drug over a long period of time is possible. For example, a paper piece in which fluorescein (fluorescent dye) is experimentally incorporated is inserted between two sheets of the existing highly hydrous soft contact lenses. The dyestuff is eluted little by little, is penetrated into the blank material of the contact lensrd and is successively spread into the conjunctival sac if the patient wears such contact lenses.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a contact lens having a continuous drug supplying ability by fixing a drug inside the structure of a hydrous soft contact lens.

[0002]

2. Description of the Related Art Conventionally, drug delivery to the ocular local area has been carried out by instillation, but the drug delivery concentration decreased with time, and sufficient and continuous drug delivery was not possible.

[0003]

With the exception of its drawbacks, the present invention has aimed at the development of a system having a drug supplying ability for a longer period of time and continuously.

[0004]

[Means for Solving the Problems] By forming a structure for fixing a drug inside a hydrous contact lens, the drug gradually contains water (including tears) in the contact lens.
It tried to be able to dissolve in and to supply a sufficient drug for a long time.

[0005]

[Advantages] Since the present invention has the above-mentioned constitution, the drug does not come into direct contact with delicate tissues such as the cornea and the conjunctiva, and moreover, the drug is dissolved in water, so that the drug can be safely and long-lived. Sufficient drug can be supplied for a long time.

[0006]

EXAMPLE A piece of paper experimentally containing fluorescein (fluorescent dye) was sandwiched between two existing soft contact lenses with high water content, and the inventor tried to wear them. As a result, the pigment gradually melted, penetrated into the contact lens material, and spread into the conjunctival sac. By changing the amount of the drug and the solid method, the concentration of the drug in the conjunctival sac and the delivery time could be controlled.

[0007]

According to the present invention, it is possible to solve the pain of a patient who has been forced to instill a drug frequently and forget to put the drug on. Moreover, when a soft contact lens is used for the purpose of corneal protection of corneal diseases, it can be a particularly effective drug supply system.

[Brief description of drawings]

FIG. 1 is a plan view of the present invention.

[Explanation of symbols]

 (1) is a contact lens 1 (2) is a contact lens 2 (3) is a drug sheet

Claims (3)

[Claims] 1. A contact lens having a drug supplying ability, which comprises a sheet-shaped drug sandwiched between two hydrous soft contact lenses. 2. A contact lens having a drug-supplying ability according to claim 1, wherein a hydrous contact lens having a space for sandwiching a drug is used in place of the two hydrous soft contact lenses. 3. A contact lens having the drug supply ability according to claim 1, wherein the drug is adhered to the material of the contact lens instead of sandwiching the drug.