JPH0346748Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to tweezers used when handling ophthalmic lenses such as contact lenses and intraocular lenses.

[Conventional technology] Conventionally, contact lenses (hereinafter referred to as CL)
When handling CL, for example, when inserting or removing CL from a storage container, you may pinch the CL with your fingers. However, if this is done, there is a problem that the CL may be soiled by dirt from the fingertips or the CL may be damaged by the fingernails.

Therefore, it has been proposed to use tweezers made of hard materials such as Teflon, stainless steel, polyethylene, and ABS resin instead of handling with fingers.

[Problem that the invention aims to solve] However, in this case, although there is little dirt,
Especially when grasping CL (especially high water content SCL)
When gripping the CL with force so as not to drop it, traces of the tweezers remain on the surface of the CL, which causes a problem of unstable vision. Furthermore, it may damage the CL surface and cause damage.

Hard tweezers are used for intraocular lenses as well as for CL, but they still have the problem of damaging the lens surface and loop.

In view of these circumstances, the present invention (1) prevents dirt from forming on the surface of the ophthalmic lens when handling it;

(2) Even if the ophthalmic lens is gripped with more force than necessary with the tweezers, marks and scratches from the tweezers are unlikely to be left on the surface.

The object of the present invention is to provide tweezers having the above characteristics.

[Means for Solving the Problems] The ophthalmic lens tweezers of the present invention include a bent portion, a pair of rod-shaped barrel portions whose rear ends are continuous through the bent portion, and a distal end of the barrel portion. A pair of tweezers used when handling ophthalmic lenses, consisting of a tip formed on each side, with a shore hardness (D) of 70 or less and a flexural modulus of 300 to 1500.
It is made of a water-free soft material with a weight of Kg/cm ² and is characterized in that the tip is thin and rounded.

Note that the ophthalmic lens referred to in the claims for utility model registration is a concept that includes contact lenses and intraocular lenses.

[Example] Next, the present invention will be explained in detail based on examples.

FIG. 1 is a perspective view showing a tweezers according to one embodiment of the present invention, and FIGS. 2 to 4 are perspective views showing the shape of the tip of tweezers according to other embodiments of the present invention.

The materials are as follows.

It is a water-free soft material that does not easily get dirty, and in particular, elastomer resins such as polybutadiene, polyisobutylene, polyisoprene, polyester, polyethylene, polypropylene, polyurethane, fluorocarbon, and silicone are preferred.

The hardness of the material is set to Shore hardness (D) of 70 or less. If it is about 70 or more, it is not preferable because it will cause tweezers marks or scratches on the surface of the ophthalmic lens (hereinafter referred to as the lens).

Further, the flexural modulus of the material is set in the range of 300 to 1500 Kg/cm ² .

If it is less than 300, the lens cannot be held. Also
If it is 1500 or more, it will cause tweezers marks and scratches, which is not preferable.

The overall shape is that of a general tweezers as shown in Fig. 1, with a bent part 1, a body part 2,
It consists of a tip 3.

However, in order to reduce the force applied to the body 2 and not affect the lens, the tip 3 has a thickness L of the body 2.
The wall thickness M of the tip portion 3 is made thinner than that of the tip portion 3. In particular, it is preferable that the wall thickness M of the tip portion 3 is 1/2 or less of the wall thickness L of the body portion 2. Furthermore, the shape of the tip 3 is rounded (cornered) so that it is less likely to be scratched even if it comes into contact with an ophthalmic lens. Especially the first
A ring shape as shown in the figure, a spherical shape as shown in FIG. 2, and a disk shape as shown in FIG. 3 are preferable from the viewpoint of ease of manufacture.

The size of the tip portion 3 may be any size that does not pose a problem in gripping the lens, but is usually about 2 to 10 mm at its maximum width.

Further, even if force is applied when grasping, the lens itself may be bent outward from the middle of the body 2, as shown in FIG. 4, so that the force does not exceed a certain level on the lens itself.
A protruding clasp 4 may be provided on the back side of the tweezers as shown in FIG. The position of the fastening part 4 is preferably near the center of the body part 2 since it functions as a fastening part, but there is no problem if it is not near the tip part 3 or near the bent part 1.

Further, an anti-slip part such as a jagged or warty part may be provided to prevent fingers from slipping when applying force to the body part 2 and handling the lens.

Tweezers made of polyester elastomer (trade name: Hytrel, manufactured by Toray Dubon Co., Ltd.) as shown in FIG. 1 (Example 1) and stainless steel tweezers having the same shape (Comparative Example 1) were prepared.

Next, the water content consisting of N-vinylpyrrolidone
Two 78% soft contact lenses were prepared, one was held between the tweezers of Example 1 and the other was held between the tweezers of Comparative Example 1, and a force of 80 gf was applied to the tip of each tweezer.

After maintaining this state for one minute, the condition of the lens was observed with the naked eye, and it was found that the contact lens of Example 1 that had been clamped with the tweezers had a clean lens surface without any marks. On the other hand, marks remained on the contact lens of Comparative Example 1 which was held with tweezers.

In place of the soft contact lens used in Example 1, an intraocular lens made of polymethyl methacrylate and a loop portion of polyvinylidene fluoride was used to conduct the same test as in Example 1 (however, the sandwiched part When observed with a 10x magnifying glass, the intraocular lens of Example 1 held in place by the tweezers was in a clean state with no scratches, but the intraocular lens held in the tweezed parts of Comparative Example 1 had faint marks. was injured.

[Effects of the invention] According to the invention, the following effects can be achieved.

(1) When handling ophthalmic lenses, you do not touch them directly with your fingers, so the surface is less likely to get dirty.

(2) Even if you apply more force than necessary to grip the lens with the tweezers, the material is soft and the tip is thin, so marks and scratches from the tweezers are unlikely to be left on the surface.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing a tweezers according to one embodiment of the present invention, and FIGS. 2 to 4 are perspective views showing the shape of the tip of tweezers according to other embodiments of the present invention. Main symbols in the drawings: 1...Bending part, 2...Body part,
3...Tip.

Claims (1)

[Scope of utility model registration request] Tweezers used for handling ophthalmic lenses, comprising a bent part, a pair of rod-shaped body parts whose rear ends are continuous through the bent part, and tip parts formed at the tips of the body parts, respectively. and has a shore hardness (D) of 70 or less and a flexural modulus of 300.
1. A tweezers for ophthalmic lenses, characterized in that the tweezers are made of a water-free soft material with a weight of ~1500 Kg/cm ² and the tip portion is thin and rounded.