RU225216U1 - INJECTOR FOR IOL IMPLANTATION - Google Patents

Abstract

The utility model relates to the field of medicine, namely to ophthalmic surgery, and is intended for delivery of an intraocular lens (IOL) into the eye cavity using an injector during phacoemulsification of cataracts. The proposed injector for IOL implantation contains a body with a cavity inside and a plunger configured to slide in the cavity; the plunger is equipped with a reverse stop mechanism, consisting of a spring and a metal strip located at an angle relative to the trajectory of the plunger. The proposed device has a simple design, is safe, and reduces the risk of absorption of eye tissue into the injector, and therefore reduces the risk of developing postoperative complications.

Description

The utility model relates to the field of medicine, namely to ophthalmic surgery, and is intended for delivery of an intraocular lens (IOL) into the eye cavity using an injector during phacoemulsification of cataracts.

Cataract is a clouding of the lens, leading to a decrease in the passage of light rays into the eye and a decrease in visual acuity. Today, the only way to eliminate this pathology is a microsurgical operation, which consists of removing the clouded lens of the eye and replacing it with an intraocular lens.

Phacoemulsification of cataracts with implantation of an intraocular lens involves removing the clouded substance of the lens using ultrasound and installing an IOL in its place, which is securely fixed and provides optical function. The phacoemulsifier turns the natural lens into an emulsion and removes it outside the eye. A new, artificial intraocular lens is inserted into the capsule where the lens was previously located, which is delivered into the eye cavity using a special microsurgical instrument - an injector for IOL implantation.

A number of injectors for intraocular lens implantation are known from the state of the art (https://vandex.ru/patents/doc/RU 2762348 C2 20211220.

https://patents.s3.yandex.net/RU 174779 U1_20171101.pdf), which have a piston mechanism. When using a piston mechanism, the operation is performed monomanually. However, when the surgeon's pressure on the plunger is slightly reduced, it is given a reverse motion. And this, in turn, has an increased risk of eye tissue being absorbed into the injector, which increases the traumatic nature of the manipulations performed. In addition, at a low speed of IOL insertion, the surgeon’s hand must be under constant tension for a long time, which causes inconvenience in work.

An injector for IOL implantation is known (https://titanmedical.ru/catalog/inzhektory/7024/), which has a screw mechanism. When working with an injector with a screw mechanism, there is no risk of spontaneous movement of the plunger, however, the surgeon is forced to use both hands to implant the IOL, which does not ensure the principle of monomanuality and creates certain inconvenience in the surgeon’s work.

The prototype of the proposed utility model is an injector for IOL implantation (https://titanmedical.ru/catalog/inzhektory/7025/), which has a body with a cavity inside and a plunger designed to slide in the cavity.

The advantages of this injector include its technical simplicity, which allows the surgeon to perform manipulation with one hand, as well as the possibility of reusable use, since thanks to the alloy used in its manufacture, the device can be sterilized. The disadvantage of such an injector is the risk of spontaneous movement of the plunger in the opposite direction, which increases the risk of injury to the internal tissues of the eye.

The technical problem to be solved by the proposed utility model is to increase the safety of the IOL implantation procedure by fixing the injector plunger.

The problem is solved by the fact that in an injector for IOL implantation, containing a body with a cavity inside and a plunger configured to slide in the cavity; the plunger is equipped with a reverse stop mechanism, consisting of a spring and a metal strip located at an angle relative to the trajectory of the plunger.

The technical result of the utility model, identified as a result of its comparison with the closest analogue, is to minimize the risk of damage to eye tissue.

In FIG. 1 shows a general view of the product, where:

1 - product body;

2 – plunger;

3 – spring;

4 - metal strip.

The utility model is used as follows.

After cataract removal using phacoemulsification using the usual method, the injector (1) with a disposable IOL cartridge inserted into it is inserted into the corneal incision. Next, the surgeon presses the plunger (2) and moves it downward with progressive movements, while the spring (3) keeps the bar from moving. When the plunger stops due to the angle of inclination, the bar (4) prevents the plunger from moving in the opposite direction. At the moment the IOL is squeezed into the eye cavity, the movement stops, the plunger is fixed, the injector is removed, and the operation is completed according to its further stages. After completing the operation, to move the plunger to its original position, press the free end of the bar until it is positioned at 90° relative to the axis of the plunger. In this case, the plunger is given a reverse stroke and returns to its original position.

Clinical example of application of the proposed method

Patient A., 62 years old, diagnosis: nuclear age-related cataract of the right eye. Phacoemulsification of the cataract was performed using a standard technique through a 2.2 mm tunnel corneal access. The anterior chamber and capsular bag were filled with viscoelastic. Implantation of the intraocular lens was performed using the proposed injector model. The preparatory stage included filling the cartridge with viscoelastic, placing the intraocular lens in the cartridge, fixing the cartridge in the injector bed and advancing the IOL to the exit hole of the cartridge by pressing the injector plunger, which was automatically fixed when the movement stopped. Next, the cartridge was placed in the corneal incision so that the exit hole of the cartridge was in the anterior chamber of the eye and the intraocular lens was moved into the anterior chamber of the eye by pressing the plunger. After the pressure on the plunger ceased, it was fixed again. The device was then removed from the eye and the surgery was completed and the main incision was hydrated. There were no complications in the intra- or postoperative period associated with the use of this device.

The proposed device has a simple design, is safe, and reduces the risk of absorption of eye tissue into the injector, and therefore reduces the risk of developing postoperative complications. In addition, it increases the surgeon’s work comfort by reducing unnecessary stress on the surgeon’s hands during this manipulation.

Claims (1)

An injector for IOL implantation, containing a body with a cavity inside and a plunger configured to slide in the cavity, characterized in that the plunger is equipped with a reverse stop mechanism consisting of a spring and a metal strip located at an angle relative to the trajectory of the plunger.