JP5041322B2 - Intraocular lens insertion device - Google Patents

Description

The present invention relates to an intraocular lens insertion device for inserting an intraocular lens into an eyeball instead of a lens extracted by cataract surgery.

In cataract surgery, a method is widely used in which a turbid lens is removed by ultrasonic emulsification and suction, and an artificial intraocular lens is implanted in the eye after the lens is removed. The intraocular lens to be implanted includes a hard intraocular lens whose optical part is made of a hard material such as polymethyl methacrylate (PMMA) and a soft intraocular lens made of a soft material such as silicone elastomer, soft acrylic, or hydrogel. is there. When using a hard intraocular lens, it is necessary to insert the intraocular lens into the cornea or sclera through an incision having a width approximately the same as or slightly larger than the diameter of the optical part. On the other hand, when a soft intraocular lens is used, the intraocular lens can be inserted into the eyeball from a smaller incision by folding the optical part. And by performing an operation with a small incision, the risk of corneal astigmatism and infection after the operation can be avoided. Under these circumstances, in recent years, soft intraocular lenses tend to be used favorably.

As a method of inserting a soft intraocular lens into the eye, there is a method of using a dedicated intraocular lens insertion device called an injector, in addition to a method of directly inserting an intraocular lens folded by an insulator directly into the eye. Furthermore, various types of intraocular lens insertion devices have been proposed, but they are roughly classified into two-hand operation type and one-hand operation type. The two-hand operation type intraocular lens insertion instrument is to insert the intraocular lens into the eyeball by holding the insertion instrument body with one hand and pushing the plunger with the other hand. Further, the one-hand operated intraocular lens insertion instrument is configured such that an index finger and a middle finger of one hand are brought into contact with a grip piece provided in the insertion instrument body, and a thumb is brought into contact with and pressed against an end surface of a plunger. Is inserted into the eyeball. The one-handed intraocular lens insertion device can be operated with only one hand, and the operator can use the other hand to grasp and stabilize the eye tissue with tweezers, or to operate other surgical instruments. Tend to prefer single-handed intraocular lens insertion instruments. By using such a dedicated injector, the intraocular lens can be folded smaller than using an insulator, and the intraocular lens (hereinafter also simply referred to as a lens) can be folded from an incision wound of 3 mm or less. It is also possible to insert into.

However, the one-hand operated intraocular lens insertion device 100 as shown in FIG. 9 presses the lens with a plunger housed in a cylindrical main body so as to be reciprocally movable and releases it into the eye. The plunger pressing force varies greatly depending on the sliding resistance between the lens and the inner surface of the main body. If the sliding resistance between the lens and the inner surface of the main body is large, it will be difficult to control the pushing force when the folded lens is released at the tip of the main body, which is the nozzle, and the lens and plunger will jump out suddenly. Risk of damaging the intraocular tissue. Therefore, an injector having a structure that can gently push the plunger in any situation has been desired.

Under such circumstances, in order to reduce the sliding resistance between the lens and the inner surface of the main body, some of the inner surface of the main body is coated. Although this injector certainly reduces the change in sliding resistance when the lens is opened, the risk of sudden popping out of the lens and plunger is reduced, but the operator's satisfaction has not yet been obtained.

Also, a rubber O-ring is provided between the outer peripheral surface of the plunger and the inner peripheral surface of the main body, and a certain pressing force is applied to the side surface of the plunger to change the sliding resistance. Is disclosed. However, in the case where the O-ring is arranged in this way, the number of parts increases, so that the manufacturing cost becomes expensive. In addition, due to an O-ring, a manufacturing dimensional error of the main body, etc., the magnitude of the sliding resistance varies depending on the individual (see, for example, Patent Document 1).

In addition, a technique is disclosed in which a spring is interposed between the main body and the plunger so that a load in the opposite direction is applied to the plunger in order to prevent the lens and the plunger from jumping out when the lens is released. ing. However, even in such a case, the plunger returns to the opposite direction at an unintended timing, so that the delicate support provided on the lens is damaged by re-extrusion or the lens is securely gripped. There is a possibility that it will not be possible (see, for example, Patent Document 2).

Furthermore, a technique has been disclosed in which a plunger having a free end is provided on the plunger to increase the sliding resistance between the inner surface of the main body, but it is difficult to stably provide sufficient sliding resistance. (For example, see Patent Document 3).
JP 2004-113610 A JP 2000-516487 International Publication No. WO2005 / 065589A1 Pamphlet

The present invention is intended to solve the problems of the above disclosed prior art, and is inexpensive to manufacture. In any situation, the plunger can be gently pushed to safely insert the lens into the eyeball. It is an object to provide an intraocular lens insertion device having a structure.

The invention according to claim 1 is an intraocular lens insertion device for inserting an intraocular lens into an eyeball, wherein the cylindrical main body passes through the intraocular lens and is guided into the eyeball; And a plunger that presses the intraocular lens and releases it into the eyeball, and has a protrusion with reduced rigidity on the side of the plunger, the protrusion on the plunger The axial position corresponds to the position at which the folded intraocular lens is released from the main body, and the projection at the stage where the folded intraocular lens is released from the tip of a nozzle provided on the main body. Is inserted into the main body to generate a sliding resistance between the protrusion and the main body.

According to a second aspect of the present invention, in the intraocular lens insertion device according to the first aspect, the projection is provided with a hole.

According to a third aspect of the present invention, in the intraocular lens insertion device according to the first aspect, the projection is provided with a concave portion.

According to a fourth aspect of the present invention, in the intraocular lens insertion device according to the first aspect, a space is provided inside the protrusion.

According to a fifth aspect of the present invention, in the intraocular lens insertion device according to the first aspect, a groove is provided in the protrusion.

A sixth aspect of the present invention is the intraocular lens insertion device according to any one of the first to fifth aspects, wherein a plurality of the protrusions are provided.

According to the intraocular lens insertion device of the first aspect, even if the protrusion is integrally formed of the same material as the plunger, the rigidity can be reduced. Therefore, the magnitude of the sliding resistance when moving the plunger inside the cylindrical main body can be easily set to an arbitrary value.

According to the intraocular lens insertion device according to claim 2, since the hole is provided in the protrusion, not only the elastic deformation of the protrusion material itself but also the rigidity of the protrusion can be reduced by the deformation of the hole provided in the protrusion. it can. Therefore, it becomes easy to adjust the sliding resistance when the plunger is moved inside the main body.

According to the intraocular lens insertion device according to claim 3, since the recess is provided in the protrusion, not only the elastic deformation of the protrusion material itself but also the rigidity of the protrusion can be reduced by the deformation of the recess provided in the protrusion. it can. Therefore, it becomes easy to adjust the sliding resistance when the plunger is moved inside the main body.

According to the intraocular lens insertion device of claim 4, since the space is provided inside the protrusion, not only the elastic deformation of the protrusion material itself but also the space inside the protrusion is deformed to reduce the rigidity of the protrusion. be able to. Therefore, it becomes easy to adjust the sliding resistance when the plunger is moved inside the main body.

According to the intraocular lens insertion device according to claim 5, since the groove is provided in the protrusion, not only the elastic deformation of the protrusion material itself but also the rigidity of the protrusion can be reduced by the deformation of the groove provided in the protrusion. it can. Therefore, it becomes easy to adjust the sliding resistance when the plunger is moved inside the main body.

According to the intraocular lens insertion device of claim 6, when the protrusions are crushed in the radial direction even if the height of each protrusion is lowered by changing the number of protrusions provided on the side of the plunger. The deformation force can be adjusted. Therefore, it becomes easy to adjust the sliding resistance when the plunger is moved inside the main body.

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. FIG. 1 is a sectional view showing an intraocular lens insertion device 1 to which the present invention is applied. The intraocular lens insertion device 1 is housed in a cylindrical main body 3 that passes through the intraocular lens 2 and is guided into the eyeball, and is reciprocally movable in the main body 3. The intraocular lens 2 is pressed to press the eyeball. And a plunger 4 for release into the inside. A projection 5 having reduced rigidity is provided on the side of the plunger 4.

The cylindrical main body 3 is provided with a nozzle 6 whose tip is inserted into the eyeball from the incision wound of the eyeball, a lens installation portion 7 for installing the lens 2, a gripping portion 8 held by the operator's finger, and the like. ing. Furthermore, a lid 9 that can be freely opened and closed is provided in the lens installation portion 7, and a fixed projection 10 for limiting the movement of the lens 2 is provided in the lens installation portion 7.

Here, since the intraocular lens insertion device 1 to which the present invention is applied is a medical device, the material of the constituent members of the device is required to be a physically and chemically stable material. In particular, the material used for the site inserted into the eye must be biologically safe. For example, materials that have been certified as implant materials by FDA (Food and Drug Administration), those that have been standardized as implant materials by ISO (International Standardization Organization), or the results of tests conducted in accordance with ISO 10993 have no problems. It is required to be confirmed. As a material that satisfies these requirements, for example, polyethylene, polypropylene, or the like can be used as the material of the cylindrical main body 3.

The lens 2 includes an optical part 2a which is a lens body and two support members 2b for fixing the position of the optical part 2a in the eyeball. The support member 2b has a thin beard shape.

The plunger 4 includes a portion 4 a having an outer diameter slightly smaller than the inner diameter of the cylindrical main body 3 and a portion 4 b having an outer diameter slightly smaller than the inner diameter of the nozzle 6. A portion 4 a having an outer diameter slightly smaller than the inner diameter of the cylindrical main body 3 is slidably inserted into the cylindrical main body 3. Further, the portion 4b having an outer diameter slightly smaller than the inner diameter of the nozzle 6 can press the periphery of the lens optical portion 2a at the tip 4c so that the lens 2 can be inserted into the eyeball from the tip of the nozzle. Has been.

When the lens 2 is inserted into the eyeball using such an intraocular lens insertion device 1, the operator can insert the lens 2 into the eyeball by one-hand operation. Specifically, the gripping portion 8 of the main body is gripped by the index finger and the middle finger of one hand, and the plunger 4 is pushed into the main body 2 by bringing the abdomen of the thumb into contact with the base end 4d of the plunger. If it does so, the lens 2 will be pressed by the front-end | tip 4c of the plunger 4, and will be pushed in into the nozzle 6, being folded from the lens installation part 7. FIG. Such a configuration and action are the same as those of the conventional intraocular lens insertion device 100 shown in FIG.

However, in the intraocular lens insertion device 1 as shown in FIG. 9, the sliding resistance between the inner surface of the nozzle 6 and the lens 2 is abrupt when the folded lens 2 is released from the nozzle tip. Therefore, unless the pressing force of the plunger 4 is instantaneously reduced in accordance with that, the tip of the plunger 4 will jump out into the eyeball too much.

On the other hand, the intraocular lens insertion device 1 according to the present invention is provided with a protrusion 5 with reduced rigidity on the side of the plunger 4. The axial position of the protrusion 5 on the plunger 4 corresponds to the position at which the folded lens 2 is discharged from the nozzle tip. Therefore, according to the present invention, even when the folded lens 2 is discharged from the tip of the nozzle 6, the protrusion 5 provided on the side of the plunger 4 is inserted into the main body 3 at that stage. As a result, a relatively large sliding resistance is generated between the protrusion 5 and the inner surface of the main body 3, and the tip 4c of the plunger 4 can be prevented from being unexpectedly inserted into the eyeball.

Further, since the protrusion 5 provided on the side of the plunger 4 has low rigidity, even when the protrusion 5 is inserted into the main body 3, the sliding between the protrusion 5 and the inner surface of the main body 3 is possible. The resistance does not become extremely large, and there is no sense of incongruity given to the operator by the change in sliding resistance. In other words, the rigidity of the protrusion 5 is determined so that the sliding resistance between the protrusion 5 and the inner surface of the main body 3 corresponds to the sliding resistance between the folded lens 2 and the inner surface of the nozzle 6. . Thus, it becomes possible to set the magnitude | size of the sliding resistance at the time of moving the plunger 4 in the inside of the cylindrical main body 3 to an appropriate value.

FIGS. 2A and 2B show a first embodiment of the present invention, in which FIG. 2A is a plan view, FIG. 2B is a front view, and FIG. In the present embodiment, a hole 11 perpendicular to the axis of the plunger 4 is provided in the protrusion 5a on the side of the plunger 4. Thus, by providing the hole 11 in the protrusion 5a, the deformation force when the protrusion 5a is crushed in the radial direction is reduced. That is, even if the protrusion 5a is molded using the same material as the plunger 4, the rigidity of the protrusion 5a can be easily reduced.

FIGS. 3A and 3B show a second embodiment of the present invention, in which FIG. 3A is a plan view, FIG. 3B is a front view, and FIG. In the present embodiment, a recess 12 is provided in the protrusion 5b on the side of the plunger 4. By providing the recess 12 in the protrusion 5b as described above, the deformation force when the protrusion 5b is crushed in the radial direction is reduced. That is, even if the protrusion 5b is formed using the same material as the plunger 4, the rigidity of the protrusion 5b can be easily reduced.

4A and 4B show a third embodiment of the present invention, in which FIG. 4A is a plan view, FIG. 4B is a front view, and FIG. In this embodiment, a space 13 is provided inside the protrusion 5c on the side of the plunger 4. By providing the space 13 inside the protrusion 5c as described above, the deformation force when the protrusion 5c is crushed in the radial direction of the plunger 4 is reduced by the air spring effect of the space 13. That is, even if the protrusion 5c is molded using the same material as the plunger 4, the rigidity of the protrusion 5c can be reduced. Therefore, the sliding resistance when the plunger 4 is moved inside the main body 3 can be easily adjusted, and the manufacturing cost can be suppressed.

FIGS. 5A and 5B show a fourth embodiment of the present invention, in which FIG. 5A is a plan view, FIG. 5B is a front view, and FIG. In the present embodiment, a hole 14 parallel to the axis of the plunger 4 is provided in the protrusion 5d on the side of the plunger 4. Thus, by providing the hole 14 in the protrusion 5d, the deformation force when the protrusion 5d is crushed in the radial direction is reduced. That is, even if the projection 5d is molded using the same material as the plunger 4, the rigidity of the projection 5d can be easily reduced.

FIGS. 6A and 6B show a fifth embodiment of the present invention, in which FIG. 6A is a plan view, FIG. 6B is a front view, and FIG. In this embodiment, a groove 15 is provided in the protrusion 5e on the side of the plunger 4. Thus, by providing the groove 15 in the protrusion 5e, the deformation force when the protrusion 5e is crushed in the radial direction is reduced. That is, even if the protrusion 5e is molded using the same material as the plunger 4, the rigidity of the protrusion 5e can be easily reduced.

FIG. 7 shows a sixth embodiment of the present invention. In this embodiment, a plurality of protrusions 5 are provided around the side of the plunger 4. Thus, even if the height of each protrusion 5 is lowered by providing the plurality of protrusions 5, it is possible to adjust the deformation force when the protrusions 5 are crushed in the radial direction. That is, even if the protrusion 5 is molded using the same material as the plunger 4, the rigidity of the protrusion 5 can be easily reduced, and the sliding frictional force between the plunger 4 and the inner surface of the main body 3 is adjusted to an appropriate value. can do.

FIG. 8 shows a seventh embodiment of the present invention. In this embodiment, a plurality of protrusions 5 are provided on the side of the plunger 4 along the axial direction. These projections 5 are provided with holes 16 perpendicular to the axis of the plunger 4. By setting it as such a structure, it becomes possible to change easily the sliding resistance of the plunger 4 and the inner surface of the main body 3 according to the pushing amount of the plunger 4.

As described above, according to the embodiment of the present invention, the plunger 4 has a simple structure in which the protrusion 5 having a reduced rigidity is provided on the side portion of the plunger 4 so as to be integrally formed of the same material as the plunger. The sliding frictional force between 4 and the inner surface of the main body 3 can be adjusted to an appropriate value. Therefore, it is possible to provide an intraocular lens insertion device that is inexpensive to manufacture and can safely insert the lens into the eyeball by gently pushing the plunger in any situation.

As mentioned above, although this invention was demonstrated based on some Examples, this invention is not limited to an above-described Example, Various deformation | transformation implementation can be performed. For example, in the above embodiment, the case where the intraocular lens 2 is directly set in the cylindrical main body 3 has been described. However, the intraocular lens 2 is set in a cartridge different from the main body 3, and the cartridge is mounted on the main body. Needless to say, the present invention can also be applied to an intraocular lens insertion device which is used by being mounted on the lens 3.

It is sectional drawing which shows the intraocular lens insertion instrument with which this invention is applied. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows a first embodiment of the present invention, where (a) is a plan view, (b) is a front view, and (c) is a cross-sectional view taken along line AA. The 2nd Example of this invention is shown, (a) is a top view, (b) is a front view, (c) is BB arrow sectional drawing. The 3rd Example of this invention is shown, (a) is a top view, (b) is a front view, (c) is CC sectional view taken on the line. 4A and 4B show a fourth embodiment of the present invention, in which FIG. 5A is a plan view, FIG. 5B is a front view, and FIG. 5A and 5B show a fifth embodiment of the present invention, where FIG. 5A is a plan view, FIG. 5B is a front view, and FIG. It is a partial external view which shows 6th Example of this invention. It is a partial external view which shows 7th Example of this invention. It is sectional drawing which shows the intraocular lens insertion instrument by a prior art.

1 Intraocular lens insertion device (injector)
2 Intraocular lens (lens)
3 Body 4 Plunger 5, 5a, 5b, 5c, 5d, 5e Projection
11, 14 holes
12 Recess
13 space
15 groove

Claims (6)

An intraocular lens insertion device for inserting an intraocular lens into an eyeball, wherein the intraocular lens is passed through the intraocular lens and guided into the eyeball, and is housed in a reciprocating manner in the main body. A plunger that presses the intraocular lens and releases it into the eyeball, and a protrusion having reduced rigidity is provided on a side of the plunger, and the axial position of the protrusion on the plunger is folded. The projection is inserted into the main body when the intraocular lens corresponds to a position where the intraocular lens is released from the main body, and the folded intraocular lens is discharged from a tip of a nozzle provided on the main body. An intraocular lens insertion device, wherein sliding resistance is generated between the protrusion and the main body. The intraocular lens insertion device according to claim 1, wherein a hole is provided in the protrusion. The intraocular lens insertion device according to claim 1, wherein a concave portion is provided in the protrusion. The intraocular lens insertion device according to claim 1, wherein a space is provided inside the protrusion. The intraocular lens insertion device according to claim 1, wherein a groove is provided in the protrusion. The intraocular lens insertion device according to claim 1, wherein a plurality of the protrusions are provided.

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