WO2006006213A1

WO2006006213A1 - Intraocular lens implanting instrument

Info

Publication number: WO2006006213A1
Application number: PCT/JP2004/009800
Authority: WO
Inventors: Hideyuki Futamura; Katsutoshi Kubota
Original assignee: Hoya Healthcare Corporation
Priority date: 2004-07-09
Filing date: 2004-07-09
Publication date: 2006-01-19

Abstract

An intraocular lens implanting tube in which a folded intraocular lens is moved smoothly through an introduction tube of the implanting tube such that a force is not applied unevenly to the intraocular lens and can be inserted into an eyeball easily while being coiled small. The transverse axis is longer than the longitudinal axis at the cross-section (8) of the insertion opening part (3), the longitudinal axis is longer than the transverse axis at the cross-section (9) of the intermediate part of the introduction tube (2), the transverse axis and the longitudinal axis are substantially equal at the cross-section (10) of the discharge opening part (4), the transverse axis changes continuously from the insertion opening part (3) toward the intermediate part to be gradually shorter, and the longitudinal axis changes continuously from the intermediate part toward the discharge opening part (4) to be gradually shorter.

Description

Specification

Intraocular lens insertion device

Technical field

[0001] The present invention relates to an intraocular lens insertion instrument used when an intraocular lens is inserted into an eyeball.

Background art

[0002] An intraocular lens has, for example, an optical part and two loops that support the optical part, and is implanted into the eyeball as a substitute for a lens affected by cataract. In this case, the incision is inserted into the eyeball.

[0003] This incision is preferably larger than the optical part of the intraocular lens from the viewpoint of ease of insertion of the intraocular lens. However, the larger the incision, the slower the recovery of the patient, so it has been desired that the incision be as small as possible. Recently, soft materials such as silicone resin, acrylic resin, and hide-mouth gel have been used as the material for intraocular lenses, and the intraocular lens is rolled or folded to enter the eyeball from a small incision. The insertion procedure has been performed.

[0004] As a method for folding this soft intraocular lens, an operator may fold the eyepiece with an insulator or the like, but a folding instrument is often used.

[0005] For example, as an instrument for folding this intraocular lens, the present applicant has invented a storage container having a soft intraocular lens folding mechanism and has filed an international application (International Application No. PCT / JP02 / 044 64, International Publication WO02Z096322) (Patent Document 1). FIG. 6 shows a perspective view of the intraocular lens mounting portion of the storage container. FIG. 6 shows a state in which the front surface of the intraocular lens L is folded outside and the back surface is folded inward in the storage container 21.

[0006] A holding portion 23 for holding an intraocular lens is provided on the base 22, and the holding portion 23 is provided with a base-side lens pressing portion 25. When the lever portion 24 is pressed, the panel portion 26 is deformed and the movable portion side lens pressing portion 27 is moved in the direction of the base portion side lens pressing portion 25, and the movable portion side lens pressing portion 27 and the base portion are moved. The intraocular lens L is held between the front-side lens pressing portion 25 and the front surface is folded outward and the rear surface is folded inward. [0007] By using the storage container 21, the intraocular lens produced on the production line can be stored aseptically and without being damaged until the operation. At the time of surgery, the intraocular lens can be folded with this storage container, and the operator can pick up the folded soft intraocular lens with an eyelid and insert it directly into the eyeball from the incision.

[0008] As described above, the intraocular lens can be inserted into the eyeball from the incision by means of the scissors. However, in the method using the scissors, skill is required in the operation, such as being careful not to damage the cornea during insertion. Is.

[0009] On the other hand, as a method of inserting the intraocular lens into the eyeball safely and reliably, there is a method using a dedicated insertion instrument for the intraocular lens.

[0010] A dedicated insertion device for an intraocular lens is referred to as an "injector", and is generally composed of an injector main body and an insertion tube portion. Of these, the insertion cylinder part is often used as a disposable cartridge from the viewpoint of hygiene, but the injector body and the insertion cylinder part are configured as a single unit and the injector is also sold as a single unit. ing.

[0011] As an insertion cylinder part used as a disposable cartridge, for example, there is one described in JP-T-2002-5 41912 (Patent Document 2), and this insertion cylinder part is shown in FIG. It has such a structure.

[0012] Reference numeral 31 denotes an insertion tube portion having an introduction pipe 32, a discharge port portion 34, and blades 36 and 37.

The introduction tube 32 has an insertion port 33 for inserting an intraocular lens, from which an intraocular lens is inserted. A discharge port portion 34 is provided at the tip of the introduction pipe 32.

In addition, blades 36 and 37 are provided near the middle of the introduction pipe 32. The blades 36 and 37 are for mounting the insertion tube portion 31 on the tip of an injector body (not shown).

By holding 36 and 37 with the holding part of the main body of the injector, the insertion tube part 21 and the main body of the injector are integrated.

[0015] Then, in the inlet portion 33 of the introduction pipe 32 indicated by a broken line, the cross-sectional shape is a flat shape in which one side surface 38a of the cross section is an arc shape, and the other side surface 38b is a flat shape in which a straight line and an arc are combined. As a result, it is asymmetric. The cross section of the intraocular lens introduction tube 32 in the direction orthogonal to the longitudinal direction has a flat shape having a major axis and a minor axis that are substantially perpendicular to each other at the center thereof. When the horizontal axis and the vertical axis are respectively used, the horizontal axis is longer than the vertical axis. [0016] In addition, as the inside of the introduction pipe 32 approaches the discharge port portion 34, in the internal cross section of the introduction pipe 32, the vertical axis and the horizontal axis are different in proportions, but both become shorter. The cross-sectional shape approaches a circular shape, and the cross-sectional shape is substantially circular in the vicinity of the discharge port 34.

[0017] Due to such an internal structure of the introduction tube 32, the intraocular lens inserted without being folded from the eyelet entrance portion 33 of the introduction tube 32 is gradually rounded so that the optical part is inside. It is.

[0018] In particular, one side of the intraocular lens can be folded slowly due to the asymmetric structure.

Patent Document 1: International Publication WO02Z096322

Patent Document 2: Japanese Translation of Special Publication 2002-541912

[0019] As a method for inserting the intraocular lens into the eyeball safely and reliably, for example, a force S that can be performed using an insertion tube as described in Patent Document 2, a state in which the lens is opened Therefore, a long distance is required from the insertion port to the discharge port, and a large amount of thickening material such as hyaluronic acid to be filled in the insertion tube before loading the lens is required. .

[0020] In view of this, the present inventor reduced the distance required to fold the insertion port and the cross-sectional area of the introduction tube, and in order to facilitate the setting of the lens in the insertion port, The shape of the lens is an elliptical shape that can be inserted by folding the lens in half, and gradually from the insertion port to the discharge port in both the horizontal and vertical directions of the cross section perpendicular to the longitudinal direction of the lens introduction tube. The inside of the introduction pipe was designed to be shorter. Using the insertion tube part designed in this way, set the intraocular lens at the eyelid entrance, attach it to the injector body, and push the push rod on the injector body to push the intraocular lens inside the insertion tube part. I tried. However, it became difficult to move the intraocular lens in the middle of the force introduction tube, and the intraocular lens could not be pushed out from the outlet.

[0021] Therefore, the present inventor considered that there is an uneven force applied to the intraocular lens as a cause of the difficulty of the movement, and paid attention to the stress.

[0022] Since the intraocular lens is inserted in a state of being folded at the entrance of the eyelid, The force works strongly in the vertical direction of the insertion port and the introduction tube trying to open in the tube. When the intraocular lens is pushed out in this state, both the vertical axis and the horizontal axis are shortened in the introduction tube, so that a lateral force is gradually applied to the intraocular lens, thereby causing the intraocular lens to move in the lateral direction. As a result, it deforms and the stress in the upward and downward directions increases.

[0023] When this happens, force is applied non-uniformly to the intraocular lens in which the longitudinal stress is greater than the lateral stress, and the stress is concentrated particularly on the root of the loop of the intraocular lens, causing the intraocular lens to be rounded. However, they found it difficult to move.

[0024] Therefore, in order to solve the above-mentioned problems, the present invention smoothly moves the inside of the insertion tube portion of the insertion tube portion so that the force is not applied unevenly to the folded intraocular lens, and makes a small round shape. Thus, an intraocular lens insertion device that can be easily inserted into the eyeball is provided.

Disclosure of the invention

[0025] The intraocular lens insertion device according to claim 1, wherein the intraocular lens insertion tube includes a substantially cylindrical intraocular lens introduction tube for introducing an intraocular lens. A cross section having an insertion port for inserting an intraocular lens and a discharge port for discharging the intraocular lens, the cross-section of the eyelid entrance portion being orthogonal to the longitudinal direction of the intraocular lens introduction tube Is a flat shape having a major axis and a minor axis that are substantially orthogonal to each other at the center thereof, and when the major axis and the minor axis are the horizontal axis and the vertical axis, respectively, In the cross section of the intermediate portion of the introduction pipe whose horizontal axis is longer than the vertical axis, the vertical axis and the horizontal axis are substantially the same in the cross section of the discharge port portion of the introduction pipe whose longitudinal axis is longer than the horizontal axis. Equally changes continuously so that the horizontal axis becomes shorter from the soot entrance to the intermediate part And it is characterized in that the are intermediate portion the outlet portion wherein the longitudinal axis is continuously changed to be shorter toward the.

[0026] According to the invention of claim 1, the intraocular lens can be easily rounded without increasing the vertical force applied to the intraocular lens folded from the eyelid entrance portion to the intermediate portion, Thereafter, a force in the vertical direction is applied from the intermediate portion to the discharge port portion to further round it, and the intraocular lens can be easily pushed out from the discharge port portion.

[0027] The intraocular lens insertion device according to claim 2 is the cross-sectional shape of the insertion port portion according to claim 1. 1S It has an upper straight portion and a lower straight portion that are substantially parallel to the horizontal axis, and the right end of the upper straight portion, the right end of the lower straight portion, and the left end of the upper straight portion and the left end of the lower straight portion are outside. A cross-sectional shape of an intermediate portion of the introduction pipe, a right straight portion and a left straight portion substantially parallel to the vertical axis, and an upper end of the right straight portion And the upper end of the left straight portion and the lower end of the right straight portion and the lower end of the left straight portion are formed in an outer arc shape, and the cross-sectional shape of the discharge port portion of the introduction pipe Is substantially circular, and both ends of the upper straight portion of the saddle entrance portion converge to an arcuate apex on the upper side of the intermediate portion, and both ends of the lower straight portion of the insertion portion are circles on the lower side of the intermediate portion. Converge to an arcuate apex, and both ends of the right straight part of the intermediate part converge to an arcuate apex on the right side of the ridge entrance, Both ends of the left straight portion of the middle portion converge to the arcuate apex on the left side of the inlet portion, and both ends of the right straight portion of the middle portion converge to the vertex of the right semicircle of the discharge port portion. The both ends of the left straight portion of the intermediate portion converge to the apex of the left semicircle of the discharge port portion.

[0028] According to the invention of claim 2, the intraocular lens can be easily rounded without increasing the vertical force applied to the intraocular lens folded from the insertion port portion to the intermediate portion, Thereafter, a force in the vertical direction is applied from the intermediate portion to the discharge port portion to further round it, and the intraocular lens can be easily pushed out from the discharge port portion. In addition, since a part of the cross-sectional shape has a straight line portion, it is easy to create a shape that converges this at each vertex.

[0029] The intraocular lens insertion device according to claim 3 is the cross-sectional shape of the insertion port portion according to claim 1, wherein the cross-sectional shape of the insertion port is a substantially elliptical shape in which the horizontal axis is longer than the vertical axis. The shape is substantially elliptical in which the vertical axis is longer than the horizontal axis, and the cross-sectional shape of the discharge port portion of the introduction pipe is substantially circular.

[0030] According to the invention of claim 3, the intraocular lens can be easily rounded without increasing the force applied to the intraocular lens folded from the eyelid entrance portion to the middle portion, and the applied vertical force. Thereafter, a force in the vertical direction is applied from the intermediate portion to the discharge port portion to further round it, and the intraocular lens can be easily pushed out from the discharge port portion. Further, since no corner is formed inside the introduction tube, the intraocular lens can be easily rounded. [0031] The intraocular lens insertion device according to claim 4 has an angle with respect to the longitudinal axis and the longitudinal axis with respect to the longitudinal axis when the longitudinal direction of the intraocular lens introduction tube is the longitudinal axis in claim 1. The tip of the intraocular lens introduction tube is formed at an angle.

[0032] According to the invention of claim 4, even when the distal end of the injector body is formed with an angle with respect to the vertical axis, the angle of the distal end of the introduction tube can be offset, and an incision in the eyeball can be achieved. The outlet can be easily inserted.

Brief Description of Drawings

FIG. 1 is a perspective view showing an insertion tube portion in an embodiment of the present invention.

FIG. 2 is a plan view showing a state in which an intraocular lens is inserted into the insertion port of the insertion cylinder in the embodiment.

[Fig. 3] Fig. 3 is a diagram showing an appearance when the insertion tube portion in the embodiment is mounted on an injector body.

FIG. 4 is a perspective view showing the shape of the introduction tube of the insertion tube part according to the first embodiment of the present invention.

FIG. 5 is a perspective view showing the shape of the introduction tube of the insertion tube part according to the second embodiment of the present invention.

FIG. 6 is a perspective view showing a storage container having a soft intraocular lens folding mechanism.

FIG. 7 is a perspective view showing a conventional insertion tube portion.

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of the present invention will be described.

First, a first embodiment of the present invention will be described.

[0036] FIG. 1 is a perspective view showing an intraocular lens insertion device that is helpful in the first embodiment of the present invention. 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.

[0037] The insertion port 3 is for loading a folded intraocular lens, and an insertion groove 5 is provided there. This insertion groove 5 is a groove for holding and loading an intraocular lens with an insulator. By inserting an insulator into this insertion groove 5, an intraocular lens that is easily folded can be loaded into the insertion port 3. . The introduction tube 2 has a tubular shape because an intraocular lens folded and set in the insertion port 3 passes therethrough. 8 is the cross-sectional shape of the entrance 3 9 shows the cross-sectional shape of the intermediate portion of the introduction pipe 2, and 10 shows the cross-sectional shape of the discharge port portion 4.

[0038] The soft intraocular lens that can use this insertion tube portion 1 is not particularly limited as long as it is soft as a material. For example, silicone resin, acrylic resin, paste, id mouth gel, etc. are used. Can.

[0039] As a method of folding the intraocular lens, a method of folding with an insulator may be used, but a method using a storage container having a mechanism for folding a soft intraocular lens is convenient. An example of the storage container is shown in FIG. The intraocular lens can be easily folded using this storage container. Since the storage container shown in FIG. 6 has been described above, the description thereof is omitted here.

[0040] In addition, a discharge port portion 4 is formed at the distal end of the introduction tube 2, and the 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, a polyalkene such as polypropylene. This polypropylene or the like contains a lubricant such as glycerol monostearate, and this lubricant is applied to the surface of the insertion tube portion 1 by plasma exposure treatment, blooming treatment, high temperature treatment, humidity treatment or the like. In many cases, the movement of the intraocular lens is made smooth.

[0041] 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 mounting portion 28, the insertion tube portion 1 and the injector body 27 become a body. As described above, the insertion tube portion 1 and the injector main body 27 constitute the intraocular lens insertion device of this embodiment.

In addition, the injector body 27 is provided with an extrusion rod 29. The tip of the push rod 29 is thin (not shown), and this tip can be inserted into the introduction tube 2 of the insertion tube portion 1. The pusher rod 29 inserts the intraocular lens into the eyeball from the discharge port 4.

Next, the internal shape of the introduction pipe 2 will be described with reference to FIG.

In FIG. 4, 8a shows a cross-sectional shape of the inlet tube 3 at the inlet portion 3, and the cross section in the direction orthogonal to the longitudinal direction of the inlet tube 2 has a long axis substantially perpendicular to each other at the central portion. Short axis and When the long axis and the short axis are the horizontal axis and the vertical axis, respectively, the upper straight part and the lower straight part are substantially parallel to the horizontal axis. The shape is formed by connecting the right end of the straight line portion, the left end of the upper straight line portion, and the left end of the lower straight line portion in an outer arc shape.

[0045] Reference numeral 9a denotes a cross-sectional shape at the intermediate portion of the introduction pipe 2, which has a right straight portion and a left straight portion substantially parallel to the vertical axis, and has an upper end and a left straight portion that are substantially parallel to the vertical axis. The upper end of the portion and the lower end of the right straight portion and the lower end of the left straight portion are connected to form an outer arc.

[0046] Further, 10a shows a cross-sectional shape of the discharge port portion 4 of the introduction pipe, which is substantially circular.

[0047] Further, both ends of the upper straight portion of the ridge entrance portion 3 converge to an arcuate vertex on the upper side of the middle portion, and both ends of the lower straight portion of the heel entrance portion 3 are arcuate vertices on the lower side of the intermediate portion. Has converged. Then, both ends of the right straight portion of the middle portion converge to the arcuate vertex on the right side of the insertion port 3, and both ends of the left straight portion of the middle portion converge to the arcuate vertex on the left side of the insertion port 3. Les

[0048] Then, in the insertion port 3, the force in which the horizontal axis is longer than the vertical axis, as in 8a, continuously changes so that the horizontal axis becomes shorter from the insertion port 3 to the middle part. Then, as in 9a, the horizontal axis is shorter than the vertical axis, that is, the vertical axis is longer than the horizontal axis.

[0049] Further, both ends of the right straight portion of the middle portion converge at the apex of the right arc of the discharge port portion 4, and both ends of the left straight portion of the intermediate portion converge at the apex of the left arc of the discharge port portion 4. is doing.

[0050] Then, in the middle portion, as shown by 9a, the vertical axis is longer than the horizontal axis. The middle portion continuously changes from the middle portion to the discharge port portion 4 so that the vertical axis becomes shorter. As shown in 10a, the vertical and horizontal axes are almost equal.

[0051] That is, the cross-sectional shape of the inside of the introduction pipe 2 does not change the length of the vertical axis from the throat inlet portion 3 to the intermediate portion, the horizontal axis becomes shorter, and the intermediate portion force also extends to the discharge port portion 4 from the horizontal axis. The length does not change and the vertical axis is shorter.

[0052] The reason for reversing the ratio of the lengths of the vertical axis and the horizontal axis in the cross section of the ridge entrance 3 and the intermediate part in this way is as follows. FIG. 2 is a plan view showing a state in which the folded intraocular lens L force S is inserted into the introduction tube 2. As can be seen from FIG. 2, the folded intraocular lens L tries to open in the introduction tube 3 and a force acts in the vertical direction of the introduction tube 2.

[0054] When this is shortened from the eyelid inlet 3 to the intermediate portion of the introduction tube 2 without changing the length of the vertical axis, the force applied to the intraocular lens by the lateral force is reduced. Since the length of the lens does not change, it is possible to move the inside of the introduction tube 2 without increasing the applied force in the vertical direction, whereby the intraocular lens L can be easily rounded. When the intraocular lens L is rounded to some extent, the intraocular lens L can be further rounded and smoothly moved through the introduction tube 2 even if a vertical force is applied thereafter. In addition, the length of the horizontal axis from the middle part to the discharge port part 4 is not changed, and the vertical axis is shortened so that the intraocular lens can be extruded from the discharge port part 4 in a slightly rounded state.

[0055] Further, since a part of the cross-sectional shape of the introduction pipe 2 has a straight line portion, it is easy to create a shape that converges this at each vertex.

[0056] Further, the discharge port portion 4 is formed with an angle with respect to the longitudinal axis when the longitudinal direction of the introduction tube 2 is taken as the longitudinal axis, that is, the cut surface is formed obliquely. Thus, the outlet 4 can be easily inserted into the incision of the eyeball.

Further, the discharge port portion 4 is formed with an angle of, for example, 45 ° with respect to the vertical axis of the discharge port portion 4. As a result, the insertion tube portion mounting portion 28 of the injector main body 27 to which the insertion tube portion 1 is attached has an angle of 45 ° with respect to the injector main body 27, for example, because of the ease of intraocular lens insertion operation. Even if 1 is attached, the angle between the discharge port 4 and the insertion tube 1 is offset, so the discharge port 4 can be easily inserted into the incision of the eyeball.

[0058] As described above, the intraocular lens insertion device of the present embodiment is the intraocular lens insertion device provided with the substantially cylindrical intraocular lens introduction tube 2 for introducing the intraocular lens. The inner lens introduction tube 2 includes a lid inlet portion 3 for inserting the intraocular lens, and a discharge port portion 4 for discharging the intraocular lens. The cross section 8a in the direction orthogonal to the longitudinal direction of the tube 2 has a flat shape having a major axis and a minor axis that are substantially perpendicular to each other at the center, and the major axis and the minor axis are respectively represented as a horizontal axis. When the vertical axis is In the cross section 8a of the insertion port 3, the cross-section of the discharge port 4 of the introduction tube 2 in which the horizontal axis is longer than the vertical axis in the cross-section 9a of the intermediate portion of the introduction tube 2 In 10a, the vertical axis and the horizontal axis continuously change so that the horizontal axis becomes shorter from the insertion port portion 3 to the intermediate portion where the horizontal axis is substantially equal, and from the intermediate portion to the discharge port portion 4 Therefore, the vertical axis changes continuously so that the vertical axis becomes shorter.

[0059] With this configuration, the intraocular lens can be easily rounded without increasing the force applied to the intraocular lens folded from the eyelid entrance part 3 to the middle part, and the applied vertical force. Further, a force in the vertical direction is applied from the intermediate portion to the discharge port portion 4 to further round it, and the intraocular lens can be easily pushed out from the discharge port portion 4.

[0060] Further, the cross-sectional shape 8a of the eaves entrance 3 has an upper straight portion and a lower straight portion that are substantially parallel to the horizontal axis, and the right end of the upper straight portion, the right end of the lower straight portion, and the upper straight portion. The left end of the line portion and the left end of the lower straight portion are formed in an outer arc shape, and the cross-sectional shape 9a of the intermediate portion of the introduction pipe 2 is a right straight portion substantially parallel to the vertical axis It has a left straight portion, and is formed by connecting the upper end of the right straight portion, the upper end of the left straight portion, the lower end of the right straight portion, and the lower end of the left straight portion in an outer arc shape. The cross-sectional shape 10a of the discharge port portion 4 of the introduction pipe 2 is substantially circular, and both ends of the upper straight portion of the insertion port portion 3 converge to an arcuate apex on the upper side of the intermediate portion. The both ends of the lower straight part of the insertion port 3 converge to the arcuate apex on the lower side of the intermediate part, and the right straight part of the intermediate part Both ends converge to the arcuate apex on the right side of the insertion port 3, and both ends of the left straight part of the intermediate unit converge to the arcuate apex on the left side of the insertion port 3, to the right of the intermediate unit Both ends of the straight portion converge at the apex of the right semicircle of the discharge port 4, and both ends of the left straight portion of the intermediate portion converge at the apex of the left semicircle of the discharge port 4.

[0061] With this configuration, the intraocular lens can be easily rounded without increasing the force applied to the intraocular lens folded from the eyelid entrance part 3 to the middle part, and the applied vertical force. Further, a force in the vertical direction is applied from the intermediate portion to the discharge port portion 4 to further round it, and the intraocular lens can be easily pushed out from the discharge port portion 4. In addition, since a part of the cross-sectional shape has a straight line portion, it is easy to create a shape that converges this at each vertex. [0062] Furthermore, when the longitudinal direction of the intraocular lens introduction tube 2 is the longitudinal axis, the distal end of the intraocular lens introduction tube 2 is formed with an angle with respect to the longitudinal axis and with an angle with respect to the longitudinal axis. Has been.

[0063] With this configuration, even when the distal end of the injector is formed with an angle with respect to the vertical axis, the angle of the distal end portion of the introduction tube 2 can be offset, and can easily be discharged to the incision of the eyeball. The outlet 4 can be inserted.

[0064] Next, a second embodiment of the present invention will be described.

[0065] Since the insertion tube portion in the second embodiment of the present invention is basically the same as the insertion tube portion in the first embodiment, the description of the same portions will be described. Is omitted.

[0066] The difference between the second embodiment and the first embodiment is that, as shown in FIG. 5, the shape inside the introduction tube 2 is substantially elliptical.

[0067] In FIG. 5, 8b shows a cross-sectional shape of the insertion port portion 3 which is the insertion port portion of the introduction tube, and the cross-sections of the introduction tube 2 in the direction perpendicular to the longitudinal direction are substantially mutually at the center. The shape is a flat shape having a major axis and a minor axis that are orthogonal to each other. When the major axis and the minor axis are respectively defined as a horizontal axis and a vertical axis, the horizontal axis is a substantially elliptical shape that is longer than the vertical axis.

[0068] Reference numeral 9b denotes a cross-sectional shape at the intermediate portion of the introduction tube 2, and the vertical axis is substantially elliptical longer than the horizontal axis.

[0069] Further, 10b shows a cross-sectional shape of the discharge port portion 4 of the introduction pipe, which is substantially circular.

[0070] Then, in the insertion port 3, the force in which the horizontal axis is longer than the vertical axis as in 8b. The insertion port 3 continuously changes from the insertion port 3 to the middle so that the horizontal axis becomes shorter. In 9b, the horizontal axis is shorter than the vertical axis, that is, the vertical axis is longer than the horizontal axis.

[0071] Further, in the intermediate part, the vertical axis is longer than the horizontal axis as in 9b. The intermediate part continuously changes so that the vertical axis becomes shorter from the outlet part 4 to the outlet part 4. Like 10b, the vertical and horizontal axes are almost equal.

[0072] That is, in the cross-sectional shape inside the introduction pipe 2, the length of the vertical axis does not change from the inlet portion 3 to the intermediate portion, the horizontal axis becomes shorter, and the length of the horizontal axis from the intermediate portion to the discharge port portion 4 Change However, the vertical axis is shortened.

[0073] From the insertion port 3 to the intermediate portion of the introduction tube 2, if the length of the horizontal axis is shortened without changing the length of the vertical axis, the force applied to the intraocular lens by the lateral force is the length of the vertical axis. Therefore, the movement in the introduction tube 2 can be performed without increasing the applied force in the upward / downward direction, whereby the intraocular lens L can be easily rounded. When the intraocular lens L becomes rounded to some extent, the intraocular lens L can be further rounded and smoothly moved through the introduction tube 2 even if the vertical force is increased. Therefore, the length of the horizontal axis is not changed from the middle part to the discharge port part 4 and the length of the vertical axis is shortened so that the intraocular lens can be pushed out from the discharge port part 4 in a slightly rounded state. is there. Further, since no corner is formed inside the introduction tube 2, the intraocular lens can be easily rounded.

[0074] As described above, the intraocular lens insertion device of the present embodiment is the intraocular lens insertion device provided with the substantially cylindrical intraocular lens introduction tube 2 for introducing the intraocular lens. The inner lens introduction tube 2 includes an insertion port portion 3 for inserting the intraocular lens and a discharge port portion 4 for discharging the intraocular lens, and the intraocular lens introduction tube of the insertion port portion 3 The cross section 8b in the direction perpendicular to the longitudinal direction of 2 has a flat shape having a major axis and a minor axis that are substantially perpendicular to each other at the center, and the major axis and the minor axis are respectively in the horizontal axis and the longitudinal axis. When the shaft is used, the horizontal axis is longer than the vertical axis in the cross section 8b of the insertion port 3, and the vertical axis is longer than the horizontal axis in the cross section 9b of the intermediate portion of the introduction pipe 2. In the cross-section 10b of the discharge port 4 of the introduction pipe 2, the vertical axis and the horizontal axis are substantially equal from the insertion port 3 to the intermediate part. The horizontal axis changes continuously so as to be shorter, the record from the intermediate portion vary the outlet portion 4 to the force 4 Na Te and continuously as the vertical axis becomes shorter, Ru Te.

[0075] With this configuration, the intraocular lens can be easily rounded without increasing the force applied to the intraocular lens folded from the eyelid entrance part 3 to the intermediate part, and the applied vertical force. Further, a force in the vertical direction is applied from the intermediate portion to the discharge port portion 4 to further round it, and the intraocular lens can be easily pushed out from the discharge port portion 4.

[0076] Further, the cross-sectional shape 8b of the rod inlet portion 3 is a substantially elliptical shape whose horizontal axis is longer than the vertical axis, and the cross-sectional shape 9b of the intermediate portion of the introduction tube 2 is a substantially elliptical shape whose vertical axis is longer than the horizontal axis. Yes, the cross-sectional shape 10b of the discharge port 4 of the introduction pipe 2 is substantially circular. [0077] With this configuration, the intraocular lens can be easily rounded without increasing the vertical force applied to the intraocular lens folded from the insertion port 3 to the intermediate portion. A vertical force is applied from the intermediate part to the discharge port part 4 to further round it, and the intraocular lens can be easily pushed out from the discharge port part 4. In addition, since no corner is formed inside the introduction tube 2, the intraocular lens can be easily rounded.

[0078] It should be noted that in each of the above embodiments, in the cross section 8 of the soot inlet 3, the horizontal axis is longer than the vertical axis, and in the intermediate section 9 of the introduction pipe 2, the vertical axis is longer than the horizontal axis. The first stage, which changes continuously from the cross section 10 of the outlet section 4 so that the vertical axis and the horizontal axis are substantially equal and the horizontal axis shortens from the inlet section 3 to the intermediate section, and the outlet from the intermediate section It changes continuously in two steps, with the second step changing so that the vertical axis becomes shorter toward part 4. With this configuration, the intraocular lens is easily applied from the left and right direction without increasing the vertical force applied to the folded intraocular lens from the eyelet entrance part 3 to the intermediate part. After that, from the middle part to the discharge port part 4, the intraocular lens can be further easily rounded by applying the force only from the up and down direction without increasing the force applied from the left and right direction. It is.

[0079] That is, by constructing to increase the force applied only in either the left-right direction or the up-down direction, compared to the conventional case where force is applied from all directions, the intraocular force is dramatically increased. This improves the roundness of the lens.

Accordingly, for example, the length of the vertical axis that is the short axis of the insertion port portion and the length of the vertical axis of the discharge port portion are equal, and the discharge port of the introduction pipe whose horizontal axis is longer than the vertical axis in the cross section of the insertion port portion. In the cross-section of the section, the vertical axis and horizontal axis are substantially equal, and the length of the vertical axis remains constant from the inlet port to the outlet port so that the horizontal axis decreases in one step. However, the force is applied only from the left and right direction without increasing the vertical force applied to the folded intraocular lens. Can be dramatically improved.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made. For example, the above-mentioned embodiments The intraocular lens insertion device has been described as an example in which the part 1 and the injector body 27 are configured separately and the insertion tube part 1 can be used as a disposable cartridge. It may be an intraocular lens insertion device having a structure in which the tube portion and the main body of the indicator are inseparably formed.

Claims

The scope of the claims

In an intraocular lens insertion device provided with a substantially cylindrical intraocular lens introduction tube for introducing an intraocular lens, the intraocular lens introduction tube includes an eyelid inlet portion for inserting the intraocular lens; and A cross-section in the direction perpendicular to the longitudinal direction of the intraocular lens introduction tube of the eyelid inlet portion is a long axis and a short axis that are substantially orthogonal to each other at the central portion. The horizontal axis is longer than the vertical axis in the cross section of the insertion port when the long axis and the short axis are the horizontal axis and the vertical axis, respectively. In the cross section of the intermediate portion, the vertical axis is longer than the horizontal axis. In the cross section of the discharge port portion of the introduction pipe, the horizontal axis is from the insertion port portion to the intermediate portion where the vertical axis and the horizontal axis are substantially equal. It changes continuously so as to be shorter, and extends from the intermediate part to the discharge port part. Intraocular lenses insertion device, characterized in that said longitudinal axis is continuously changed to be shorter.

A cross-sectional shape of the insertion port portion includes an upper straight portion and a lower straight portion that are substantially parallel to the horizontal axis, the right end of the upper straight portion, the right end of the lower straight portion, the left end of the upper straight portion, and the The shape is formed by connecting the left end of the lower straight portion to the outer arc, and the cross-sectional shape of the intermediate portion of the introduction pipe has a right straight portion and a left straight portion substantially parallel to the vertical axis, The upper end of the right straight portion, the upper end of the left straight portion, and the lower end of the right straight portion and the lower end of the left straight portion are formed in an outer arc shape, and the discharge of the introduction pipe The cross-sectional shape of the outlet portion is substantially circular, both ends of the upper straight portion of the heel inlet portion converge to an arcuate vertex on the upper side of the intermediate portion, and both ends of the lower straight portion of the heel inlet portion are the intermediate Converge at the arcuate apex on the lower side of the section, and both ends of the right straight section of the middle section Converged to the arcuate apex of the intermediate part, both ends of the left straight part of the intermediate part converged to the arcuate apex on the left side of the inlet part, and both ends of the right straight part of the intermediate part were the discharge port 2. The intraocular region according to claim 1, wherein both ends of the left straight line portion of the intermediate portion converge to the vertices of the left semicircle of the discharge port portion. Lens insertion instrument.

The cross-sectional shape of the insertion port is a substantially elliptical shape in which the horizontal axis is longer than the vertical axis, and the cross-sectional shape of the intermediate portion of the introduction tube is a substantially elliptical shape in which the vertical axis is longer than the horizontal axis, The intraocular lens insertion device according to claim 1, wherein a cross-sectional shape of a discharge port portion of the introduction tube is substantially circular.

When the longitudinal direction of the intraocular lens introduction tube is the longitudinal axis, the distal end of the intraocular lens introduction tube is formed with an angle with respect to the longitudinal axis and with an angle with respect to the longitudinal axis. The intraocular lens insertion device according to claim 1.