JP2006014962A - Machining method of tip of intraocular lens insertion apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a machining method for the tip of an intraocular lens insertion apparatus forming the tip portion of an insertion tube into a shape facilitating its insertion into the eye in a simple process without using a special die. <P>SOLUTION: This machining method for the tip of the intraocular lens insertion apparatus is provided with an insertion opening part 3 for inserting the intraocular lens and a discharge opening part 4 for discharging the intraocular lens. The tip portion 4A of the discharge opening 4 is machined using laser to form the tip portion 4A into a diagonally cut shape and form a slit in a simple process, thereby forming the tip portion 4A into the shape facilitating its insertion into the eye. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a tip processing method for an intraocular lens insertion instrument used when an intraocular lens is inserted into an eyeball.

  In cataract surgery, a method is widely used in which an opaque lens is removed by ultrasonic emulsification absorption (PEA), and then an intraocular lens is implanted in the eye instead of the removed lens. The intraocular lens includes an optical unit that functions as a lens, and a support unit that holds the intraocular lens on the eye axis in the eye. The intraocular lens is roughly classified into a hard intraocular lens whose optical part is made of a hard material such as polymethylmethacrylate, and a soft intraocular lens whose optical part is made of a soft material such as soft acrylic or silicone.

  When a hard intraocular lens is inserted into the eye, an incision having a width equal to or greater than the diameter of the optical part of about 6 mm is formed in the cornea or sclera, and the intraocular lens is inserted through the wound. . On the other hand, when inserting a soft intraocular lens, the soft intraocular lens can be folded softly, so that it can be inserted through an incision having a width of 4 mm or less smaller than the diameter of the optical part. it can. In addition, when a dedicated insertion instrument is used, it is possible to insert from an incision with a smaller width.

  By reducing the width of the incision, the burden on the patient due to surgery is reduced, corneal astigmatism due to surgery is less likely to occur, and the possibility of infection through the incision is reduced. For these reasons, soft intraocular lenses tend to be preferred.

  A dedicated insertion instrument for an intraocular lens is called an injector, and is generally composed of an injector body and an insertion tube. This insertion cylinder part is often used in a disposable manner from the viewpoint of hygiene, but an injector main body and an insertion cylinder part are integrally configured, and an injector that is disposable is also sold.

  When the injector is used, the lens installed in the insertion tube portion is sent out by the push rod of the injector, and the intraocular lens is moved into the eye through the insertion tube portion in which the tip portion is inserted into the eye. In order to facilitate the insertion of the distal end portion of the insertion tube portion from a small wound opening, the distal end portion of the insertion tube portion is generally cut obliquely at an appropriate angle. In addition, in order to facilitate the insertion of the distal end portion of the insertion tube portion, a slit is formed in the distal end portion of the insertion tube portion in parallel with the direction in which the intraocular lens moves, and the distal end portion of the insertion tube portion is aligned with the insertion. Those configured to be appropriately deformed are also known.

  By the way, in order to form the tip of the insertion cylinder part obliquely cut, or to form a slit in the tip part of the insertion cylinder part, by mold molding processing such as injection molding or extrusion molding using a mold, It is easiest to process at the same time as forming the insertion tube. However, due to the configuration of the molding die, it may be difficult to form a shape in which the distal end portion of the insertion tube portion is cut obliquely or to form a slit when the insertion tube portion is formed. Moreover, a partially undesirable burr | flash may produce | generate. In such a case, it was necessary to separately process the tip of the insertion cylinder after the mold forming process.

As a method for processing the distal end portion of the insertion tube portion after the mold forming process, for example, Patent Document 1 discloses a method using a mold having a shape corresponding to the shape of the distal end portion of the insertion tube portion.
WO03 / 043547 gazette

  In the method of Patent Document 1, the distal end portion of the insertion tube portion is inserted into a heated mold so that the distal end portion is formed into a desired shape and the burr is eliminated. However, in accordance with the shape of the distal end portion of the insertion tube portion, it is necessary to prepare a mold having a complicated shape, and there is a problem that the cost for producing the mold cannot be ignored.

  Therefore, the present invention inserts the distal end portion of the insertion tube portion into the eye by forming the slit portion into a shape that is obliquely cut and using a simple process without using a special mold. An object of the present invention is to provide a method for processing the distal end of an intraocular lens insertion device that can be shaped to facilitate the operation.

  The tip processing method for an intraocular lens insertion device according to claim 1 is a tip processing method for an intraocular lens insertion device comprising an insertion port portion into which an intraocular lens is inserted and a discharge port portion through which the intraocular lens is discharged. In addition, the tip of the discharge port is processed using a laser.

  A tip processing method for an intraocular lens insertion device according to claim 2 is characterized in that, in claim 1, the laser is a carbon dioxide gas laser.

  The tip processing method for an intraocular lens insertion device according to claim 3 is a tip processing method for an intraocular lens insertion device comprising an insertion port portion into which an intraocular lens is inserted and a discharge port portion through which the intraocular lens is discharged. And the front-end | tip part of the said discharge port part is processed using the heated wire.

  The tip processing method for an intraocular lens insertion device according to claim 4 is a tip processing method for an intraocular lens insertion device comprising an insertion port portion into which an intraocular lens is inserted and a discharge port portion through which the intraocular lens is discharged. And the front-end | tip part of the said discharge port part is processed using the heated flat plate, It is characterized by the above-mentioned.

  The tip processing method of the intraocular lens insertion device according to claim 1 has a shape in which the tip portion of the intraocular lens insertion device is cut obliquely by a simple process by processing the tip portion of the discharge port portion using a laser. The tip of the intraocular lens insertion device can be shaped to be easily inserted into the eye, such as by forming a slit.

  The tip processing method of the intraocular lens insertion device according to claim 2 can suitably process the resin-made intraocular lens insertion device by using a carbon dioxide gas laser.

  The distal end processing method for the intraocular lens insertion device according to claim 3 cuts the distal end portion of the intraocular lens insertion device obliquely in a simple process by processing the distal end portion of the discharge port portion using a heated wire. The tip of the intraocular lens insertion device can be easily inserted into the eye, such as by forming a slit and forming a slit.

  The distal end processing method for an intraocular lens insertion device according to claim 4 is a method of processing the distal end portion of the discharge port portion using a heated flat plate so that the distal end portion of the intraocular lens insertion device is burred or sharpened in a simple process. It is possible to obtain a shape with a rounded corner so that the tip of the intraocular lens insertion device can be easily inserted into the eye.

  The present invention relates to a method for processing a distal end portion of a resin-made intraocular lens insertion device into an arbitrary shape. And the front-end | tip part is processed secondary with respect to the resin-made intraocular lens insertion instrument shape | molded by injection molding, extrusion molding, etc. FIG. In the secondary processing, a laser, a heated wire, and a heated flat plate are used.

  Here, the configuration of the intraocular lens insertion device will be described. FIG. 1 shows an example of an intraocular lens insertion device. In FIG. 1, reference numeral 1 denotes an insertion tube portion. The insertion tube portion 1 includes an introduction tube 2, an insertion port portion 3, a discharge port portion 4, an insertion groove 5, and blades 6 and 7.

  The insertion port 3 is for loading a folded intraocular lens, and an insertion groove 5 is provided there. The insertion groove 5 is a groove for holding and loading an intraocular lens with a lever. By inserting the lever into the insertion groove 5, the folded intraocular lens can be loaded into the insertion port 3. Further, the inside of the introduction tube 2 has a tubular shape because an intraocular lens that is folded and set in the insertion port 3 passes therethrough. Reference numeral 8 denotes a cross-sectional shape of the insertion port portion 3, 9 denotes a cross-sectional shape of the intermediate portion of the introduction pipe 2, and 10 denotes a cross-sectional shape of the discharge port portion 4.

  The soft intraocular lens that can use the insertion tube portion 1 is not particularly limited as long as it is a soft material, and for example, a silicone resin, an acrylic resin, a hydrogel, or the like can be used.

  Further, a discharge port portion 4 is formed at the distal end of the introduction tube 2, and this discharge port portion 4 is inserted into an incision in the eyeball. Therefore, the insertion tube portion 1 needs to be made of a material that does not adversely affect the human body, and is made of, for example, polyalkene such as polypropylene.

  The blades 6 and 7 are for mounting the insertion tube portion 1 on the insertion tube portion mounting portion 28 provided at the tip of the injector body 27 as shown in FIG. By holding, the insertion tube portion 1 and the injector body 27 are integrated. Thus, the insertion tube portion 1 and the injector body 27 constitute an intraocular lens insertion instrument.

  Further, the injector body 27 is provided with an extrusion rod 29. The distal end of the extrusion rod 29 is thin (not shown), and the distal end can be inserted into the introduction tube 2 of the insertion tube portion 1. The push rod 29 is used to insert an intraocular lens into the eyeball from the outlet 4.

  Next, an embodiment of the tip processing method of the intraocular lens insertion device will be described.

  The insertion cylinder part 1 is shape | molded by injection molding. The resin used in this injection molding is preferably polypropylene or polystyrene suitable for injection molding. At this point in time, the angled cut shape or slit shape need not be given to the distal end portion 4A of the discharge port portion 4 of the injection-molded insertion tube portion 1.

  Next, the molded insertion tube portion 1 is fixed to a predetermined jig (not shown), and the distal end portion 4A is cut with a laser to be processed into a predetermined shape. As the laser used here, a carbon dioxide laser suitable for resin processing is preferable. The conditions are a pulse width of 0.1 to 0.2 ms, a repetition of 100 pulses / second (pps), and a peak output of about 1.5 kW. However, it is not limited to this. Resin powder may be generated by laser processing, but this can be easily removed by blowing air.

  As described above, the distal end processing method of the intraocular lens insertion device of the present embodiment is an intraocular lens including the insertion port portion 3 into which the intraocular lens is inserted and the discharge port portion 4 from which the intraocular lens is discharged. It is a tip processing method of an insertion instrument, and by processing the tip portion 4A of the discharge port portion 4 using a laser, the tip portion 4A is cut obliquely by a simple process, and a slit is formed, etc. The tip 4A can be shaped to be easily inserted into the eye.

  Further, by using a carbon dioxide laser, it is possible to suitably process a resin-made intraocular lens insertion device.

  In this embodiment, a heated wire is used instead of processing using a laser.

  Fix the molded insertion cylinder 1 to a predetermined jig (not shown), and apply a copper wire as a wire heated to a temperature exceeding the melting point of the resin constituting the insertion cylinder 1 to the tip 4A, The tip portion 4A is processed into a predetermined shape. A preferable wire temperature is 120 to 150 ° C. when the resin is polypropylene or polyethylene.

  As described above, the distal end processing method of the intraocular lens insertion device of the present embodiment is an intraocular lens including the insertion port portion 3 into which the intraocular lens is inserted and the discharge port portion 4 from which the intraocular lens is discharged. It is a tip processing method for an insertion instrument, and the tip portion 4A of the discharge port portion 4 is processed using a heated wire, so that the tip portion 4A is cut into an oblique shape by a simple process, and a slit is formed. For example, the tip 4A can be shaped to be easily inserted into the eye.

  In this embodiment, a heated flat plate is used instead of processing using a laser or a heated wire.

  In the present embodiment, it is desirable to perform injection molding in advance so that the distal end portion 4A of the discharge port portion 4 of the insertion tube portion 1 has an angled cut shape or slit shape.

  The formed distal end portion 4A of the insertion tube portion 1 is brought close to a distance of about 1 mm to a flat plate heated to a temperature exceeding the melting point of the resin constituting the insertion tube portion 1. The tip portion 4A is slightly melted in one to several seconds, and is deformed into a shape having an excess burr generated at the tip portion 4A during injection molding and a sharp corner of the tip portion 4A. A preferable flat plate temperature is 120 to 150 ° C. when the resin is polypropylene or polyethylene.

  Moreover, you may use as a heated flat plate what the hole was formed in the shape which covers 4 A of front-end | tip parts. By inserting the tip portion 4A into a heated flat plate hole, the tip portion 4A is slightly melted in 1 to several seconds, and extra burrs generated at the tip portion 4A during injection molding and sharp corners of the tip portion 4A are removed. Deforms to a different shape.

  As described above, the distal end processing method of the intraocular lens insertion device of the present embodiment is an intraocular lens including the insertion port portion 3 into which the intraocular lens is inserted and the discharge port portion 4 from which the intraocular lens is discharged. It is a tip processing method of an insertion instrument, and by processing the tip portion 4A of the discharge port portion 4 using a heated flat plate, the tip portion 4A is shaped into a burr and a sharp corner in a simple process, The tip 4A can be shaped to be easily inserted into the eye.

  As mentioned above, although the Example of this invention was described, this invention is not limited to the said Example, A various deformation | transformation implementation is possible. For example, in each of the above embodiments, the intraocular lens insertion device in which the insertion tube portion 1 and the injector body 27 are configured separately has been described as an example. It may be a formed structure.

It is a perspective view which shows the insertion cylinder part in the Example of this invention. It is a perspective view which shows a mode that an insertion cylinder part same as the above is mounted | worn with an injector main body.

Explanation of symbols

3 Insertion Port 4 Discharge Port 4A Tip

Claims (4)

A tip processing method for an intraocular lens insertion device comprising an insertion port for inserting an intraocular lens and a discharge port for discharging an intraocular lens, wherein the tip of the discharge port is removed using a laser. A tip processing method for an intraocular lens insertion device, characterized by processing. The tip processing method for an intraocular lens insertion device according to claim 1, wherein the laser is a carbon dioxide gas laser. A tip processing method for an intraocular lens insertion device comprising an insertion port for inserting an intraocular lens and a discharge port for discharging an intraocular lens, the tip of the discharge port using a heated wire A tip processing method for an intraocular lens insertion device, characterized by processing a portion. A tip processing method for an intraocular lens insertion device comprising an insertion port for inserting an intraocular lens and a discharge port for discharging an intraocular lens, the tip of the discharge port using a heated flat plate A tip processing method for an intraocular lens insertion device, characterized by processing a portion.

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