Source: https://patents.google.com/patent/JP4648859B2/en
Timestamp: 2020-01-24 22:27:13
Document Index: 189558558

Matched Legal Cases: ['art 1', 'art 2', 'art 5', 'art 5', 'art 5', 'art 5', 'art 5', 'art 5', 'art 5', 'art 5', 'art 5', 'art 5', 'art 5', 'art 5', 'art 5', 'art 5', 'art 5', 'art 5', 'art 5', 'art 5', 'art 5', 'art 5', 'art 5', 'art 5', 'art 5', 'art 5', 'art 5', 'art 5', 'art 5', 'art 5', 'art 5', 'art 5', 'art 5', 'art 5', 'art 5', 'art 5', 'art 5', 'art 5', 'art 5', 'art 5', 'art 5', 'art 5', 'art 5', 'art 5', 'art 5', 'art 5', 'art 5', 'art 5', 'art 5', 'art 5', 'art 5', 'art 5', 'art 5', 'art 5', 'art 14', 'art 14', 'art 14', 'art 5', 'art 5', 'art 5', 'art 5', 'art 5', 'art 5', 'art 5', 'art 24', 'art 5', 'art 5', 'art 5', 'art 5', 'art 5', 'art 5', 'art 5', 'art 5', 'art 5', 'art 5', 'arts 4', 'art 14']

JP4648859B2 - Intraocular lens insertion device and intraocular lens insertion system - Google Patents
Intraocular lens insertion device and intraocular lens insertion system Download PDF
JP4648859B2
JP4648859B2 JP2006070748A JP2006070748A JP4648859B2 JP 4648859 B2 JP4648859 B2 JP 4648859B2 JP 2006070748 A JP2006070748 A JP 2006070748A JP 2006070748 A JP2006070748 A JP 2006070748A JP 4648859 B2 JP4648859 B2 JP 4648859B2
JP2006070748A
JP2007244570A (en
JP2007244570A5 (en
泰宏 菱沼
2006-03-15 Application filed by スター・ジャパン株式会社 filed Critical スター・ジャパン株式会社
2006-03-15 Priority to JP2006070748A priority Critical patent/JP4648859B2/en
2007-09-27 Publication of JP2007244570A5 publication Critical patent/JP2007244570A5/ja
2007-09-27 Publication of JP2007244570A publication Critical patent/JP2007244570A/en
2011-03-09 Publication of JP4648859B2 publication Critical patent/JP4648859B2/en
In surgery for cataracts, an artificial intraocular lens is deformed so as to be folded using its flexibility, and the lens is inserted into the eye through an incision formed in the eyeball. ing. In such an operation, the lens loaded in the instrument main body is deformed to be small while being moved in the instrument main body by the pushing shaft, and the lens is pushed into the eye from the distal end opening of the insertion tube inserted into the incision. An insertion instrument (see, for example, Patent Document 1) is often used.
Such an insertion device is used not only in cataract surgery but also in insertion surgery of an intraocular lens for vision correction treatment or the like.
An example of a conventional insertion instrument for an intraocular lens is shown in FIG. FIG. 15A is a top view of a conventional insertion instrument, and FIG. 15B is a side view of the conventional insertion instrument.
In this figure, reference numeral 2 denotes a cylindrical main body, and a lens installation portion (not shown) is provided at the tip side. An intraocular lens (not shown) is installed in the lens installation unit. Note that an insertion cylinder is provided at the distal end of the main body 2 to be inserted into an incision formed in the eyeball and feed the lens into the eye, but is not shown in FIG.
Reference numeral 1 denotes an extrusion shaft that is inserted into the main body 2 and pushes the lens installed in the lens installation section into the eye through the insertion tube. A push shaft portion 1c is formed at the tip of the push shaft 1 so as to contact the lens and pass through the inside of the thin insertion tube together with the lens. A plunger 3 as an operation member for operating the extrusion shaft 1 is attached to the rear portion of the extrusion shaft 1.
In FIG. 15B, reference numeral 2a denotes a retaining portion formed inside the rear end portion of the main body 2. The extrusion shaft 1 is formed so as to have a D-shaped cross section when viewed from the axial direction of the extrusion shaft 1 from the intermediate portion to the rear end portion thereof. For this reason, a stepped portion 1b between a rear end side portion 1a having the D-shaped cross section and a front end side portion having a circular cross section is formed in the intermediate portion of the extrusion shaft 1. And when this level | step-difference part 1b contact | abuts from the front end side to the retainer part 2a, the slip-out | removal with respect to the main body 2 of the extrusion shaft 1 is prevented. This retaining structure is provided to avoid the inconvenience that the push-out shaft 1 slips out of the main body 2 during the operation.
When assembling the conventional insertion instrument shown in FIG. 15, first, as shown in FIG. 16 (FIG. 16 (a) is a top view and FIG. 16 (b) is a side view), an extrusion shaft before the plunger 3 is attached. 1 is inserted into the main body 2 from the front end opening of the main body 2. This is because the push shaft 1 cannot be inserted into the main body 2 from the rear end side of the main body 2 because the inner diameter of the position where the retaining portion 2a is formed in the main body 2 is smaller than the diameter of the stepped portion 1b. It is.
Then, as shown in FIG. 17 (FIG. 17A is a top view and FIG. 17B is a side view), the plunger 3 is assembled to the rear portion of the extrusion shaft 1 protruding from the rear end opening of the main body 2.
JP 2001-104347 A
However, in the above-described conventional method for assembling an insertion instrument, the plunger 3 is attached to a portion of the extrusion shaft 1 protruding from the rear end opening of the body 2 after the extrusion shaft 1 is inserted into the body 2. There is a problem that it requires work and takes time and labor to assemble. In the above assembling method, the plunger 3 must be configured as a separate member from the extrusion shaft 1, which increases the number of parts and complicates the assembling work.
Further, when the extrusion shaft 1 is inserted into the main body 2 from its front end opening, the thin push shaft portion 1c is held until a certain length of the extrusion shaft 1 protrudes from the rear end opening of the main body 2. It is necessary to push into the main body 2. At this time, if there is a catch or the like between the extrusion shaft 1 and the main body 2, the push shaft portion 1c may be bent or deformed.
Further, in this manner, in the insertion tool, once the push shaft is started to push in the tip direction and the lens is deformed, and the push shaft is pulled back, the tip of the push shaft is not moved even if the push shaft is moved again in the tip direction. There may be a problem that the lens cannot be pushed properly. For this reason, after the push shaft is once pushed, it is necessary to take measures to prevent it from being pulled back.
An object of the present invention is to provide an insertion device for an intraocular lens that can be easily assembled while reliably avoiding the backward withdrawal of an extrusion shaft.
According to the present invention, insertion of an intraocular lens having a main body that accommodates an intraocular lens and an extrusion shaft that pushes the intraocular lens accommodated in the main body into the eye from the tip of the main body. A movement blocking part that prevents the movement of the extrusion shaft by abutting a radially protruding protrusion provided on the extrusion shaft is provided on the inside of the main body. The cylindrical member including the portion includes a split structure portion that is divided into a plurality of opening and closing portions that can be opened and closed in the direction around the axis of the main body, and the insertion of an intraocular lens provided with the movement preventing portion in the opening and closing portion An instrument is provided.
Note that an insertion system for an intraocular lens including the insertion instrument and an intraocular lens accommodated in the main body of the insertion instrument also constitutes one aspect of the present invention.
According to the present invention, even when the movement preventing portion that prevents the extrusion shaft from being pulled backward is formed in the main body, the splittable portion (the divided structure portion) including the movement preventing portion and the rear end opening is opened. In this way, the extrusion shaft can be inserted from the rear end side of the main body. Accordingly, the extrusion shaft can be inserted into the main body without having a thin portion on the tip side of the extrusion shaft, and assembly can be easily performed. Then, by closing the divided structure portion after insertion, it is possible to prevent the extrusion shaft from coming out backward.
In addition, according to this configuration, it is possible to integrally form the operation portion having a larger dimension in the direction perpendicular to the shaft than the shaft portion on the extrusion shaft. Therefore, the number of parts can be reduced and the assembling work can be simplified.
1A and 1B show a top view and a side view, respectively, of an insertion device for an intraocular lens that is Embodiment 1 of the present invention.
Here, in the following description, the direction in which the intraocular lens is pushed out is referred to as the front end side, and the opposite side is referred to as the rear or rear end side. The direction extending to the front end side and the rear end side is referred to as the axial direction. Furthermore, the direction orthogonal to the axial direction is referred to as the radial direction, and the direction around the axis (direction along the outer periphery or inner periphery in the axial direction view) is referred to as the circumferential direction.
In addition, the figure on the right side in Fig.1 (a) and FIG.1 (b) has shown the shape when the main body of this insertion instrument is seen from an axial back.
In these drawings, reference numeral 5 denotes a cylindrical member, which has a generally hollow cylindrical shape. An insertion cylinder 6 is attached to the tip of the cylinder member 5. The cylinder member 5 and the insertion cylinder 6 constitute a main body.
On the outer periphery of the rear portion of the cylindrical member 5, a collar portion 5e extending outward in the radial direction is formed. The collar portion 5e is a portion for the operator to put his / her finger when pushing the push-out shaft 4 described later in the distal direction. Moreover, the part (part to a rear-end opening) behind the collar part 5e in the cylinder member 5 has the division | segmentation structure part 5h divided into 2 in the circumferential direction. The configuration of the divided structure portion 5h will be described later.
An opening 6 a for installing an intraocular lens (hereinafter simply referred to as a lens) 10 in the insertion tube 6 is formed on the upper surface of the intermediate portion in the axial direction of the insertion tube 6. The lens 10 disposed in the insertion tube 6 through the opening 6a includes a lens holding portion (lens installation portion) 6c formed in the insertion tube 6 and a lens formed in a cover member 7 that closes the opening 6a. The holding portion 7a holds the edge portion of the optical portion (the portion having an optical function as a lens) sandwiched from above and below. At this time, the lens 10 is held in a state where stress is not substantially applied to the optical part.
Here, the state in which the stress is not substantially applied to the optical part of the lens 10 is not limited to the state in which no stress is applied to the optical part, but even if the lens 1 is stored for a long time in the holding state, it is inserted into the eye. This also includes a state in which a minute stress is applied to such an extent that deformation that affects the optical action of the subsequent optical unit does not remain.
The distal end portion 6b of the insertion tube 6 is a portion that is inserted into an incision formed in the eyeball and feeds the lens 10 into the eye, and has a shape with a smaller inner diameter toward the distal end. The distal end portion 6b deforms the lens 10 passing through the inside so as to be folded small, and sends the lens 10 into the eye from the distal end opening.
A push shaft portion 4e having a small diameter that can pass through the distal end portion 6b of the insertion tube 6 is formed at a portion closer to the distal end than the intermediate portion in the axial direction of the push shaft 4 inserted into the cylindrical member 5. Yes. At the tip of the push shaft portion 4e, a bifurcated lens holding portion 4g for securely pushing the optical portion of the lens 10 held by the lens holding portions 6c and 7a from above and below into the eye via the insertion tube 6 is ensured. Is formed.
Further, a cylindrical portion 4 f having a circular cross section when viewed in the axial direction of the extrusion shaft 4 and having an outer diameter slightly smaller than the inner diameter of the cylindrical member 5 is formed at the intermediate portion of the extrusion shaft 4. An O-ring (not shown) is attached to the outer periphery of the cylindrical portion 4f, and the O-ring is in close contact with the inner peripheral surface of the cylindrical member 5 to form a seal structure. In this seal structure, when the lens 10 is pushed into the eye, a viscoelastic substance such as a hyaluronic acid aqueous solution is injected into the insertion tube 6 and the tube member 5 as a lubricant. This is to prevent leakage.
Further, the portion on the rear end side from the cylindrical portion 4 f of the extrusion shaft 4 is formed so as to have a D-shaped cross section whose upper surface is a plane when viewed in the axial direction of the extrusion shaft 4. 4a in the figure indicates a D-cut shaft portion having this D-shaped cross section.
Furthermore, a collar portion 4c extending outward in the radial direction from the D-cut shaft portion 4a and the cylindrical portion 4f is formed at the rear end of the extrusion shaft 4. The collar portion 4c is a portion that the operator pushes with a finger when performing an operation of pushing the pushing shaft 4 in the distal direction in order to insert the lens 10 into the eye.
Next, the structure of the division | segmentation structure part 5h of the rear end side rather than the collar part 5e in the cylinder member 5 is demonstrated. The divided structure portion 5 h includes an opening / closing portion 5 a and a fixing portion 5 b that are divided into two in the circumferential direction of the cylindrical member 5. In other words, the divided structure portion 5h is divided into two when viewed in the axial direction.
The fixing portion 5b is a semi-cylindrical portion formed so as to extend rearward from a portion on the distal end side of the flange portion 5e of the cylindrical member 5 as it is. One end in the radial direction of the opening / closing part 5a is connected to one end in the radial direction of the fixed part 5b via a hinge part 5c. The opening / closing part 5a and the hinge part 5c are integrally formed with the fixed part 5b (that is, the cylindrical member 5). The opening / closing part 5a can be opened / closed with respect to the fixed part 5b around the hinge part 5c.
The outer peripheral surface of the opening / closing part 5a has a semi-cylindrical surface shape. On the other hand, the inner peripheral surface of the opening / closing portion 5a is formed by a flat central portion in the circumferential direction, and the other portions are formed by curved surfaces constituting a part of the cylindrical surface. Thereby, when the opening / closing part 5a is combined (closed) with the fixing part 5b as described later, a space having a D-shaped cross section is formed in the divided structure part 5h. The space is a space for passing the D-cut shaft portion 4 a of the extrusion shaft 4 and is a rear end opening of the cylindrical member 5.
As shown in FIGS. 1A and 1B, a lock claw 5i is formed on the side of the opening / closing portion 5a opposite to the hinge portion 5c. On the other hand, a lock receiving portion 5j to which the lock claw 5i can be engaged is formed on the opposite side of the fixed portion 5b to the hinge portion 5c. By closing the opening / closing part 5a with respect to the fixed part 5b and engaging the lock claw 5i with the lock receiving part 5j, the opening / closing part 5a is locked in a state of being combined (coupled) with the fixed part 5b. .
As described above, the inner peripheral surface of the divided structure portion 5h in the closed state has a D-shaped cross section, and this cross-sectional shape substantially matches the D-shaped cross section of the D cut shaft portion 4a of the extruded shaft 4, so that the extrusion The rotation of the shaft 4 with respect to the cylindrical member 5 is prevented. The direction of the lens holding portion 4g provided at the tip of the extrusion shaft 4 is determined so that the upper and lower surfaces of the optical portion of the lens 10 can be correctly held. For this reason, it is possible to avoid an extrusion error of the lens 10 by preventing the rotation of the extrusion shaft 4 as described above.
Here, as shown in FIG. 4 in an enlarged manner, a stepped portion is formed at the boundary between the cylindrical portion 4f and the D-cut shaft portion 4a of the extrusion shaft 4 due to a radial dimension difference between the D-cut shaft portion 4a and the cylindrical portion 4f. 4b is formed.
On the other hand, in the opening / closing part 5a of the cylindrical member 5, the part whose inner peripheral surface is flat as described above functions as a retaining part 5d as a movement preventing part. That is, the stepped portion 4b comes into contact with the distal end surface 5g of the retaining portion 5d from the distal end side, thereby preventing the push-out shaft 4 from coming out backward with respect to the cylindrical member 5. This retaining structure is provided in order to avoid the inconvenience that the push-out shaft 4 slips out of the cylindrical member 5 during the operation.
When assembling the insertion tool configured as described above, first, as shown in FIG. 2, the push-out shaft 4 is moved from the distal end side to the inside of the cylindrical member 5 through the divided structure portion 5h opened in the cylindrical member 5. insert. 2A and 2B show a top view and a side view of the insertion tool, respectively.
Even if the radial dimension of a part of the rear end opening (D-shaped space) is smaller than the cylindrical portion 4f of the extrusion shaft 4 in a state where the divided structure portion 5h is closed, the divided structure portion 5h is closed. Until the cylindrical portion 4f (stepped portion 4b) reaches a position closer to the distal end side than the split structure portion 5h (a retaining portion 5d when the opening / closing portion 5a is closed), the push shaft 4 is inserted into the cylindrical member 5 from the distal end side. Can be inserted.
Moreover, since the extrusion shaft 4 can be inserted into the cylindrical member 5 from the tip end side in this way, there is no problem even if the flange portion 4c is formed on the extrusion shaft 4.
Furthermore, in this embodiment, the insertion tube 6 may be attached to the tip of the tube member 5 before the push shaft 4 is inserted into the tube member 5, or after the push shaft 4 is inserted into the tube member 5. The insertion tube 6 may be attached to the tip of the tube member 5.
Thus, after inserting the extrusion shaft 4 into the cylindrical member 5 until the cylindrical portion 4f (stepped portion 4b) is located on the tip side of the divided structure portion 5h, as shown in FIGS. 1 and 3, the opening / closing portion 5a is opened. It closes with respect to the fixing | fixed part 5b, and engages the lock nail | claw 5i with the lock | rock receiving part 5j. Thereby, the assembly of the insertion tool is completed, and the pushing shaft 4 is prevented from coming out backward by the contact between the stepped portion 4b and the tip end surface 5g of the retaining portion 5d.
3A and 3B show a top view and a side view of the insertion tool, respectively. Further, the left and right views in FIGS. 3A and 3B respectively show the shapes when the main body 5 is viewed from the front end side and the rear end side in the axial direction.
As described above, according to the present embodiment, since the split structure portion 5h that includes the retaining portion 5d and can be opened and closed in the circumferential direction is provided at the rear end portion of the cylindrical member 5, the cylindrical portion 4f ( The extrusion shaft 4 having the stepped portion 4b) can be inserted into the cylindrical member 5 from the tip side. Therefore, as compared with the conventional case where the push shaft is inserted from the distal end side of the cylindrical member by having a thin push shaft portion or the like, the assembly can be easily performed.
In addition, since the collar portion 4c can be formed integrally with the extrusion shaft 4, the number of parts can be reduced compared to the case where the operation portion such as the collar portion is a separate component from the extrusion shaft. Can also be done more easily.
Further, by integrally forming the opening / closing part 5a, the fixing part 5b, and the hinge part 5c constituting the divided structure part 5h in the cylindrical member 5, it is possible to avoid an increase in the number of parts due to the provision of the divided structure part 5h. it can.
Then, after the stepped portion 4b of the push shaft 4 is inserted into the cylindrical member 5 to a position slightly beyond the tip position of the divided structure portion 5h, the divided structure portion 5h is closed and locked. As a result, it is possible to reliably prevent the extrusion shaft 4 from coming out backward from the cylindrical member 5 thereafter.
Furthermore, in this embodiment, as shown in FIGS. 1, 3, and 4, a hemispherical protrusion 4h is formed on the plane of the D-cut shaft portion 4a of the extrusion shaft 4. As shown in FIGS. 3 and 4, a groove 5k extending from the front end of the retaining portion 5d to the vicinity of the rear end is formed on the inner surface of the retaining portion 5d in the opening / closing portion 5a. A wall portion 5m is formed between the rear end of the groove 5k and the rear end of the retaining portion 5d. The depth of the groove 5k is slightly deeper than the height of the protrusion 4h.
The protrusion 4h is provided at a position in contact with or close to the rear end surface of the wall portion 5m (that is, the retaining portion 5d) in the insertion tool assembled as described above. By the protrusion 4h coming into contact with the wall 5m, the movement of the push shaft 4 in the distal direction is prevented unless a force of a predetermined value or more is applied. When a force greater than the predetermined value is applied to the extrusion shaft 4 during lens insertion, the protrusion 4h enters the groove 5k through a narrow gap between the wall portion 5m and the extrusion shaft 4 (D-cut shaft portion 4a). . Although this gap is not shown in FIG. 4, there are actually some gaps. After this, the extrusion shaft 4 can be smoothly moved in the distal direction.
By providing such a structure, it is possible to prevent the pushing shaft 4 from being inadvertently pushed in the distal direction with respect to the cylindrical member 5 without hindering the pushing of the lens 10 by the pushing shaft 4. In particular, since the insertion tool of the present embodiment can be stored together with the lens 10 without substantially applying stress to the optical part of the lens 10, the pushing shaft is pushed in by an unexpected external force during storage or transportation, and the lens It is possible to prevent 10 from being deformed in the insertion tube 6 or jumping out of the insertion tube 6.
FIG. 5 shows an insertion device for an intraocular lens which is Embodiment 2 of the present invention. 5A is a top view, and FIG. 5B is a side sectional view.
In the present embodiment, the same reference numerals as those in the first embodiment are assigned to components that are common or only partially different from those in the first embodiment.
The insertion instrument of the present embodiment differs from that of the first embodiment in the configuration of a part of the cylindrical member 5 and the configuration of the extrusion shaft 14. The cylindrical member 5 differs in the structure of the opening / closing part 5a ′ in the divided structure part h in accordance with the difference in the structure of the extrusion shaft 14. The insertion cylinder 6 and the cover member 7 are the same as those of the first embodiment, and the configuration of the cylinder member 5 other than the opening / closing part 5a ′ is the same as that of the first embodiment. Hereinafter, the configuration of the extrusion shaft 14 and the opening / closing part 5a ′ will be mainly described.
First, the configuration of the extrusion shaft 14 will be described with reference to FIG. FIG. 10A and FIG. 10B are a top view and a side sectional view, respectively, of the extrusion shaft 14.
A push shaft portion 14e having a narrow diameter that can pass through the distal end portion 6b of the insertion tube 6 is formed at a portion closer to the distal end than the intermediate portion in the axial direction of the extrusion shaft 14. At the tip of the push shaft portion 14e, a bifurcated lens for reliably pushing out the optical portion of the lens 10 held by the lens holding portion described in Embodiment 1 from above and below into the eye via the insertion tube 6. A sandwiching portion 14g is formed.
Further, a cylindrical portion 14 f having a circular cross section when viewed in the axial direction of the extrusion shaft 14 and having an outer diameter slightly smaller than the inner diameter of the cylindrical member 5 is formed at the intermediate portion of the extrusion shaft 14. As described in the first embodiment, an O-ring (not shown) is attached to the outer periphery of the cylindrical portion 14f, and the O-ring is in close contact with the inner peripheral surface of the cylindrical member 5 to form a seal structure.
Further, the portion on the rear end side from the cylindrical portion 14 f of the extrusion shaft 14 is formed so as to have a D-shaped cross section whose upper surface is a plane when viewed in the axial direction of the extrusion shaft 14. Reference numeral 14a in the figure denotes a D-cut shaft portion having this D-shaped cross section. The outer diameter of the portion other than the upper surface (plane) of the D-cut shaft portion 14a is equal to the outer diameter of the cylindrical portion 14f.
Further, a collar portion 14c extending outward in the radial direction from the D-cut shaft portion 14a and the cylindrical portion 14f is formed at the rear end of the extrusion shaft 14. The collar portion 14c is a portion that the operator pushes with a finger when performing an operation of pushing the pushing shaft 14 in the distal direction in order to insert the lens 10 into the eye.
Of the upper part of the D-cut shaft portion 14a, the second portion is arranged in order from the front end side to the rear end side in a portion located behind the rear end surface of the tubular member 5 (the divided structure portion 5h) in the assembled state of the insertion instrument. A movable plate portion 14n and two first movable plate portions 14k and 14m are formed. Each of these movable plate portions 14n, 14k, 14m is connected to the D-cut shaft portion 14a by a hinge portion 11p. The movable plate portions 14n, 14k, 14m and the hinge portion 14p are integrally formed with the D-cut shaft portion 114a (that is, the extrusion shaft 14).
The second movable plate portion 14n is biased radially upward by the elasticity of the hinge portion 14p provided on the rear end side. For this reason, in a state where no force from above is applied to the second movable plate portion 14n, the second movable plate portion 14n rises obliquely, that is, protrudes with respect to the D-cut shaft portion 14a. Projection position: third position).
On the other hand, the first movable plate portions 14k and 14m are urged upward in the radial direction by the elasticity of the hinge portion 14p provided on the tip side thereof. For this reason, in a state where no force from above is applied to the first movable plate portions 14k and 14m, the first movable plate portions 14k and 14m are in a protruding state in which the rear end side rises obliquely with respect to the D-cut shaft portion 14a. (Protruding position: first position).
In addition, a storage groove portion 14q having a depth substantially equal to the thickness of each movable plate portion is formed in a portion of the D-cut shaft portion 14a facing the lower surfaces of the three movable plate portions 14n, 14k, 14m and the hinge portion 14p. Has been. For this reason, when a force from above is applied to each movable plate portion and the movable plate portion moves downward about the hinge portion 14p, the movable plate portion and the hinge portion 14p are stored in the storage groove portion 14q. In this retracted position, the upper surfaces of the movable plate portions and the hinge portion 14p are substantially the same height as the upper surface of the D-cut shaft portion 14a.
A portion of each movable plate portion opposite to the hinge portion 14p has a curved shape (U shape) in a top view shown in FIG. 10 (a) and a side view shown in FIG. 10 (b). Furthermore, a portion of each movable plate portion that is closer to the hinge portion 14p than the U-shaped portion is an outer surface shape that is continuous with the upper outer surface of the D-cut shaft portion 14a in a state where each movable plate portion is pushed down to the storage position, that is, D It is formed so as to have the same outer surface shape as that of the upper surface of the cut shaft portion 14a. Here, the “outer surface shape continuous with the upper outer surface of the D-cut shaft portion 14a” may be an outer surface shape that matches at least the upper outer surface of the D-cut shaft portion 14a in the axial direction view. This also includes the case where there is a deviation that does not hinder the rotation of the extrusion shaft 14 with respect to the cylindrical member 5.
Next, the configuration of the opening / closing part 5a ′ of the cylindrical member 5 will be described with reference to FIG. FIG. 9A, FIG. 9B, and FIG. 9C are a top view, an axial view from the rear end side, and a side view, respectively, of the cylindrical member 5.
One end in the radial direction of the opening / closing portion 5a ′ is connected to one end in the radial direction of the fixed portion 5b of the cylindrical member 5 via a hinge portion 5c. The opening / closing part 5a 'and the hinge part 5c are integrally formed with the fixed part 5b (that is, the cylindrical member 5). The opening / closing part 5a 'can be opened / closed with respect to the fixed part 5b with the hinge part 5c as the center.
The outer peripheral surface of the opening / closing part 5a 'has a semi-cylindrical surface shape. On the other hand, the central portion in the circumferential direction of the inner periphery of the opening / closing portion 5a ′ has a flat surface portion 5r, a slope portion 5q, and a return prevention portion 5d ′ as a movement prevention portion in order from the front end side to the rear end side. Is formed.
The flat surface portion 5r is configured by a plane parallel to the axial direction, and is located away from the central axis of the cylindrical member 5 by the same dimension as the inner radius of the distal end side portion of the cylindrical member 5 relative to the divided structure portion 5h Is formed.
The inclined surface portion 5q is configured by a flat surface that is inclined so as to be away from the central axis 5o of the cylindrical member 5 toward the rear end side.
The return blocking portion 5d ′ has an inner end surface (plane) formed at a position closer to the central axis 5o of the cylindrical member 5 than the flat portion 5r, and the rear end of the wedge-shaped inclined space 5p facing the inclined surface portion 5q. It is comprised as a wall part which plugs up.
Of the inner periphery of the opening / closing part 5a ′, the part other than the central part in the circumferential direction is formed by a curved surface constituting a part of the cylindrical surface.
And the lock claw 5i is formed in the opening / closing part 5a 'on the opposite side to the hinge part 5c. The opening / closing part 5a 'is closed with respect to the fixing part 5b with the hinge part 5c as the center, and the locking claw 5i is engaged with a lock receiving part 5j formed on the opposite side of the fixing part 5b from the hinge part 5c, thereby opening and closing The portion 5a 'can be locked in a state where it is combined (coupled) with the fixing portion 5b.
When the split structure portion 5h is viewed from the rear end side in a state where the opening / closing portion 5a 'is closed with respect to the fixed portion 5b, the return blocking portion 5d' and the fixed portion are disposed inside the rear end portion of the split structure portion 5h. A rear end opening having a D-shaped cross section is formed by the inner peripheral surface of 5b. Further, in the region below the central axis 5o on the front end side with respect to the rear end opening, the semi-cylindrical space formed by the fixing portion 5b extends in the front end direction, and further on the region above the central axis 5o, there is a slope. An inclined space 5p facing the portion 5q and a space facing the flat portion 5r are sequentially formed toward the tip side.
The D cross-sectional shape of the rear end opening substantially coincides with the D-shaped cross section of the D-cut shaft portion 14 a of the extrusion shaft 14. Thereby, after inserting the extrusion shaft 14 in the cylinder member 5, rotation with respect to the cylinder member 5 of the extrusion shaft 14 is blocked | prevented. The direction of the lens holding portion 14g provided at the tip of the extrusion shaft 14 is determined so that the upper and lower surfaces of the optical portion of the lens 10 can be correctly held. For this reason, it is possible to avoid an extrusion error of the lens 10 by preventing the rotation of the extrusion shaft 14 as described above.
When assembling the insertion tool configured as described above, the push-out shaft 14 is inserted into the cylindrical member 5 from the distal end side through the divided structure portion 5h in the cylindrical member 5 in the open state. By opening the divided structure portion 5h including the return blocking portion 5d ′, when the divided structure portion 5h is closed, the radial direction of a part of the rear end opening (D-shaped space) rather than the cylindrical portion 14f of the extrusion shaft 14 Even if the size is small, the push-out shaft 14 can be inserted into the cylindrical member 5 from the distal end side until the cylindrical portion 14f reaches a position on the distal end side with respect to the divided structure portion 5h. Moreover, since the extrusion shaft 14 can be inserted into the cylindrical member 5 from the tip end side in this way, there is no problem even if the flange portion 14c is formed on the extrusion shaft 14.
In this embodiment, the insertion tube 6 may be attached to the tip of the tube member 5 before the push shaft 14 is inserted into the tube member 5, or after the push shaft 14 is inserted into the tube member 5. The insertion tube 6 may be attached to the tip of the tube member 5.
Thus, after the extrusion shaft 14 is inserted into the cylindrical member 5 until the cylindrical portion 14f is positioned on the tip side of the divided structure portion 5h, the opening / closing portion 5a 'is closed with respect to the fixed portion 5b, and the lock claw 5i is received by the lock. Engage with the part 5j. Thereby, as shown in FIG. 5, the assembly of the insertion instrument is completed.
In the assembled state, the second movable plate portion 14n rises to the protruding position, and its tip abuts or approaches the rear end surface of the cylindrical member 5 (the return blocking portion 5d ′ of the opening / closing portion 5a ′ of the divided structure portion 5h). To do. When the front end of the second movable plate portion 14n comes into contact with the rear end surface of the cylindrical member 5, movement of the push shaft 14 in the front end direction is prevented. For this reason, it is possible to reliably prevent inadvertent movement of the extrusion shaft 14 in the distal direction.
As shown in FIG. 6, when the second movable plate portion 14n is pushed down to the retracted position, the contact between the tip of the second movable plate portion 14n and the rear end surface of the cylindrical member 5 is released. For this reason, by operating the second movable plate portion 14n to the retracted position at the time of surgery or the like, movement of the push shaft 14 in the distal direction, that is, insertion of the lens 10 into the eye is allowed. In addition, since the front-end | tip of the 2nd movable plate part 14n has U shape in a top view and a side view, the 2nd movable plate part 14n can be smoothly operated from a protrusion position to a storage position.
Furthermore, since the operation of the second movable plate portion 14n to the storage position is a simple push-down operation that can be performed with one finger, there is almost no burden on the surgeon during the operation.
When the pushing shaft 14 is pushed in the distal direction in this way, as shown in FIG. 7, the first movable plate portion 14k is pushed downward from the protruding position by the return blocking portion 5d 'and stored in the retracted position. Although not shown, when the push shaft 14 is further pushed in the distal direction, the second movable plate portion 14m is pushed downward from the protruding position by the return blocking portion 5d 'and stored in the retracted position. Thus, the pushing operation of the push shaft 14 (insertion of the lens 10 into the eye) can be performed without the user performing the operation of pushing down the first movable plate portions 14k and 14m at the protruding positions to the retracted position. Can do.
Here, as described above, since the outer surface shape of each movable plate portion at the storage position is continuous with the outer surface shape of the D-cut shaft portion 14a, even when each movable plate portion passes inside the divided structure portion 5h, The rotation of the extrusion shaft 14 with respect to the cylindrical member 5 is prevented. Therefore, the lens 10 can be properly pushed out by the extrusion shaft 14.
For example, as shown in FIG. 8, when the pushing shaft 14 is pushed to a position where the first movable plate portion 14k passes the return blocking portion 5d ', the first movable portion 14k that has been stored in the retracted position until then is hinged. Due to the urging force of the portion 14p, it rises again to the protruding position in the inclined space 5p in the divided structure portion 5h. And the 1st movable board part 14k contact | abuts or adjoins with respect to the surface at the front end side of return prevention part 5d '. When the first movable plate portion 14k comes into contact with the tip-side surface of the return blocking portion 5d ′, the subsequent movement of the extrusion shaft 14 is blocked.
The pushing shaft 14 operated to the position shown in FIG. 8 is in a state in which the lens 10 is pushed halfway through the insertion tube 6 by the lens clamping portion 14g at the tip, and the lens 10 is deformed within the insertion tube 6 to some extent. . If the extrusion shaft 14 is pulled back from this state, the lens 10 cannot be properly clamped or pushed by the lens clamping portion 14g even if the extrusion shaft 14 is pushed again in the distal direction.
For this reason, in this embodiment, once the push shaft 14 is pushed to the position shown in FIG. 8, the push shaft 14 cannot be pulled back by the first movable plate portion 14k coming into contact with the return blocking portion 5d ′. I am doing so.
Further, although not shown, when the pushing shaft 14 is pushed to the position immediately before the lens 10 comes out from the tip of the insertion cylinder 6, another first movable plate that has been once pushed down to the retracted position by the return blocking portion 5d '. The portion 14m rises to the protruding position in the inclined space 5p by the urging force of the hinge portion 14p, and comes into contact with or approaches the tip side surface of the return blocking portion 5d ′. When the first movable plate portion 14m comes into contact with the surface on the front end side of the return preventing portion 5d ', the backward pulling of the push-out shaft 14 thereafter is prevented.
As described above, according to the present embodiment, the cylindrical member 14f is provided on the rear end side portion of the cylindrical member 5 with the return blocking portion 5d 'and the split structure portion 5h that can be opened and closed in the circumferential direction. Can be inserted into the cylindrical member 5 from the tip end side thereof. Therefore, as compared with the conventional case where the push shaft is inserted from the distal end side of the cylindrical member by having a thin push shaft portion or the like, the assembly can be easily performed.
In addition, since the collar portion 14c can be formed integrally with the extrusion shaft 14, the number of parts can be reduced compared to the case where the operation portion such as the collar portion is a separate component from the extrusion shaft. Can also be done more easily.
Further, the opening / closing part 5a ', the fixing part 5b, and the hinge part 5c constituting the divided structure part 5h are integrally formed with the cylindrical member 5, thereby avoiding an increase in the number of parts due to the provision of the divided structure part 5h. Can do.
Further, in the present embodiment, the second movable plate portion 14n can be moved between a protruding position that prevents the movement of the push shaft 14 in the distal direction and a retracted position that allows the movement, and the hinge portion 14p is attached. The second movable plate portion 14n is biased to the protruding position by the force. For this reason, even if there are variations in dimensions such as manufacturing errors, it is possible to reliably prevent inadvertent movement of the extrusion shaft 14 in the distal direction. In addition, it is possible to smoothly and appropriately move the push-out shaft 14 in the direction of the distal end when necessary at the time of surgery, etc., simply by pushing down the second movable plate portion 14n to the storage position (operation that can be performed with one finger). It can be carried out.
In the present embodiment, the first movable plate portions 14k and 14m are provided to prevent the push-back shaft 14 from being pulled backward, and the first movable plate portions 14k and 14m are moved to the protruding positions by the biasing force of the hinge portion 14p. Energized. For this reason, even if there are dimensional variations such as manufacturing errors, it is possible to reliably prevent the extrusion shaft 14 from being pulled back. In addition, the second movable plate portions 14k and 14m are automatically pushed down to the storage position by the return blocking portion 5d 'provided in the cylindrical member 5 as the push shaft 14 moves in the distal direction. It is possible to easily perform the movement operation in the distal direction without performing the push-down operation of the second movable plate portions 14k and 14m.
Further, by providing the opening / closing portion 5a ′ with the inclined surface portion 5q that closes the space 5p, the first movable plate portions 14k and 14m get over the return blocking portion 5d ′ when a pulling force is applied to the pushing shaft 14. Thus, it can be prevented from being deformed upward and broken.
The first and second movable plate portions 14k, 14m, 14n and the hinge portion 14p are integrally formed on the extrusion shaft 14, thereby avoiding an increase in the number of parts. However, a stopper member having a movable plate portion and a hinge portion may be configured as a separate member from the extrusion shaft, and the stopper member may be attached to the extrusion shaft.
FIG. 11 shows an insertion device for an intraocular lens which is Embodiment 3 of the present invention. FIG. 11A is a top view, and FIG. 11B is a side sectional view.
In the present embodiment, the same reference numerals as those in the first and second embodiments are assigned to components that are common or only partially different from the first and second embodiments.
The insertion instrument of the present embodiment is different from the first and second embodiments in the configuration of a part of the cylindrical member 5 and the configuration of the pushing shaft 24. The cylindrical member 5 is different from the first and second embodiments in the configuration of the opening / closing portion 5a ″ in the divided structure portion h. The insertion tube 6 and the cover member 7 are the same as those in the first and second embodiments, and the opening / closing portion in the cylindrical member 5 is the same. The configuration other than 5a ″ is the same as in the first and second embodiments. Hereinafter, the configuration of the extrusion shaft 24 and the opening / closing part 5a ″ will be mainly described.
First, the configuration of the extrusion shaft 24 will be described with reference to FIG. FIG. 24A and FIG. 24B are a top view and a side sectional view of the extrusion shaft 24, respectively.
A push shaft portion 24e having a small diameter that can pass through the distal end portion 6b of the insertion tube 6 is formed at a portion closer to the distal end than the intermediate portion in the axial direction of the extrusion shaft 24. At the tip of the push shaft 24e, a bifurcated lens for reliably pushing the optical part of the lens 10 held by the lens holding part described in the first embodiment from above and below into the eye via the insertion tube 6. A clamping part 24g is formed.
A cylindrical portion 24 f having a circular cross section when viewed in the axial direction of the extrusion shaft 24 and having an outer diameter slightly smaller than the inner diameter of the cylindrical member 5 is formed at an intermediate portion of the extrusion shaft 24. As described in the first embodiment, an O-ring (not shown) is attached to the outer periphery of the cylindrical portion 24f, and the O-ring is in close contact with the inner peripheral surface of the cylindrical member 5 to form a seal structure.
Further, the portion on the rear end side from the cylindrical portion 24 f of the extrusion shaft 24 is formed so as to have a D-shaped cross section whose upper surface is a plane when viewed in the axial direction of the extrusion shaft 24. 24a in the figure indicates a D-cut shaft portion having this D-shaped cross section. The outer diameter of the portion other than the upper surface (plane) of the D-cut shaft portion 24a is equal to the outer diameter of the cylindrical portion 24f.
Further, a collar portion 24c extending outward in the radial direction from the D-cut shaft portion 24a and the cylindrical portion 24f is formed at the rear end of the extrusion shaft 24. The collar portion 24c is a portion that the operator pushes with a finger when performing an operation of pushing the pushing shaft 24 in the distal direction in order to insert the lens 10 into the eye.
A movable plate portion 24k is formed in a portion of the upper portion of the D-cut shaft portion 24a that is located behind the rear end surface of the cylindrical member 5 (the divided structure portion 5h) when the assembly of the insertion instrument is completed. The movable plate portion 24k is connected to the D-cut shaft portion 24a at the root portion. The movable plate portion 24a is integrally formed with the D-cut shaft portion 24a (that is, the extrusion shaft 24).
The movable plate portion 24k is formed so as to have a predetermined rising angle with respect to the D-cut shaft portion 24a from the root portion thereof. Therefore, in a state where no force from above is applied to the movable plate portion 24k, the movable plate portion 24k is in a protruding state in which the rear end side rises obliquely with respect to the D-cut shaft portion 24a (protruding position: first position). ).
In addition, a storage groove portion 24q having substantially the same depth as the thickness of the movable plate portion 24k is formed in a portion of the D-cut shaft portion 24a facing the lower surface of the movable plate portion 24k. For this reason, when a force from above is applied to the movable plate portion 24k and the movable plate portion 24k moves downward about the root portion, the movable plate portion 24k is stored in the storage groove portion 24q. In this storage position, the upper surface of the movable plate portion 24k is substantially the same height as the upper surface of the D-cut shaft portion 24a.
The portion of the movable plate portion 24k opposite to the root portion has a curved shape (U shape) in a top view shown in FIG. 14A and a side view shown in FIG. 14B. Further, a portion of the movable plate portion 24k that is closer to the root than the U-shaped portion has an outer surface shape that is continuous with the upper outer surface of the D-cut shaft portion 24a in a state where the movable plate portion 24k is pushed down to the storage position, that is, the D-cut shaft. It is formed to have the same outer surface shape as the outer surface shape of the upper part of the portion 24a. Here, “the outer surface shape continuous with the upper outer surface of the D-cut shaft portion 24a” has the same meaning as in the second embodiment.
Next, the configuration of the opening / closing part 5a ″ of the cylindrical member 5 will be described with reference to FIG. 13. FIGS. 13 (a), 13 (b) and 13 (c) are a top view and a rear view of the cylindrical member 5, respectively. It is the axial direction view and side view from an end side.
One end in the radial direction of the opening / closing part 5a ″ is connected to one end in the radial direction of the fixing part 5b of the cylindrical member 5 via a hinge part 5c. The opening / closing part 5a ″ and the hinge part 5c are connected to the fixing part 5b (that is, the cylinder). It is integrally formed with the member 5). The opening / closing part 5a ″ can be opened / closed with respect to the fixed part 5b around the hinge part 5c.
The outer peripheral surface of the opening / closing portion 5a ″ has a semi-cylindrical surface shape. On the other hand, the central portion in the circumferential direction of the inner periphery of the opening / closing portion 5a ″ is, in order from the front end side to the rear end side, the inclined surface portion 5q ″. And a return blocking portion 5d ″ as a portion.
The inclined surface portion 5q ″ is formed such that the tip thereof is separated from the central axis of the cylindrical member 5 by the same dimension as the inner radius of the portion of the cylindrical member 5 on the distal end side of the divided structure portion 5h. It is comprised by the plane inclined so that it might leave | separate from the center axis | shaft 5o of the cylinder member 5 toward the end side.
The return blocking portion 5d ″ has an inner end surface (plane) formed at a position closer to the central axis 5o of the cylindrical member 5 than the tip of the inclined surface portion 5q ″, and a wedge-shaped inclined space facing the inclined surface portion 5q ″. It is comprised as a wall part which blocks the rear end of 5p.
A portion of the inner periphery of the opening / closing portion 5a ″ other than the central portion in the circumferential direction is formed by a curved surface constituting a part of the cylindrical surface.
A lock claw 5i is formed on the side of the opening / closing portion 5a ″ opposite to the hinge portion 5c. The opening / closing portion 5a ″ is closed with respect to the fixing portion 5b around the hinge portion 5c, and the lock claw 5i is fixed. By engaging with a lock receiving portion 5j formed on the side of the portion 5b opposite to the hinge portion 5c, the opening / closing portion 5a ″ can be locked in a state where it is combined (coupled) with the fixing portion 5b.
When the opening / closing portion 5a ″ is closed with respect to the fixed portion 5b, when the divided structure portion 5h is viewed from the rear end side, the return blocking portion 5d ″ and the fixed portion are disposed inside the rear end portion of the divided structure portion 5h. A rear end opening having a D-shaped cross section is formed by the inner peripheral surface of 5b. Further, in the region below the central axis 5o on the front end side with respect to the rear end opening, the semi-cylindrical space formed by the fixing portion 5b extends in the front end direction, and further on the region above the central axis 5o, the inclined surface An inclined space 5p facing the portion 5q ″ is formed.
The D cross-sectional shape of the rear end opening substantially coincides with the D-shaped cross section of the D-cut shaft portion 24 a of the extrusion shaft 24. Thereby, after inserting the extrusion shaft 24 in the cylinder member 5, rotation with respect to the cylinder member 5 of the extrusion shaft 24 is blocked | prevented. The direction of the lens clamping portion 24g provided at the tip of the extrusion shaft 24 is determined so that the upper and lower surfaces of the optical portion of the lens 10 can be correctly sandwiched. For this reason, it is possible to avoid an extrusion error of the lens 10 by preventing the rotation of the extrusion shaft 24 as described above.
When assembling the insertion tool configured as described above, the push-out shaft 24 is inserted into the inside of the cylindrical member 5 from the distal end side through the divided structure portion 5h in the cylindrical member 5 in the open state. By opening the divided structure portion 5h including the return blocking portion 5d ″, when the divided structure portion 5h is closed, the radial direction of a part of the rear end opening (D-shaped space) rather than the cylindrical portion 24f of the extrusion shaft 24 Even if the dimensions are small, the push-out shaft 24 can be inserted into the cylindrical member 5 from the tip side until the cylindrical portion 24f reaches the position on the tip side with respect to the divided structure portion 5h. Since the shaft 24 can be inserted into the cylindrical member 5 from the tip end side, there is no problem even if the collar portion 24c is formed on the extruded shaft 24.
In this embodiment, the insertion tube 6 may be attached to the tip of the tube member 5 before the push shaft 24 is inserted into the tube member 5, or after the push shaft 24 is inserted into the tube member 5. The insertion tube 6 may be attached to the tip of the tube member 5.
Thus, after the extrusion shaft 24 is inserted into the cylindrical member 5 until the cylindrical portion 24f is positioned on the tip side of the divided structure portion 5h, the opening / closing portion 5a ″ is closed with respect to the fixed portion 5b, and the lock claw 5i is received by the lock. As shown in Fig. 11, the assembly of the insertion tool is completed.
In the present embodiment, the base portion of the movable plate portion 24k is not formed as a hinge portion as in the second embodiment, but is formed in a shape having a certain degree of strength against deformation. For this reason, even if an external force in the front end direction acts on the push shaft 24, the movable plate portion 24k at the protruding position abuts against the rear end surface of the return blocking portion 5d ″ as long as the external force is not greater than a certain level. Movement of the shaft 24 in the distal direction is prevented.
In the operation or the like, when the pushing shaft 24 is pushed from the position shown in FIG. 11 in the distal direction with an operating force of a certain level or more, the push-down force from the return blocking portion 5d ″ acts on the movable plate portion 24k, and the root portion is By elastically deforming, the movable plate portion 24k is stored in the storage position, so that the user does not need to push down the movable plate portion 24k in the protruding position to the storage position. A push operation (insertion of the lens 10 into the eye) can be performed.
Here, as described above, since the outer surface shape of the movable plate portion 24k in the storage position is continuous with the outer surface shape of the D-cut shaft portion 24a, even when each movable plate portion passes through the inside of the divided structure portion 5h, The extrusion shaft 24 is prevented from rotating with respect to the cylindrical member 5. Therefore, the lens 10 can be properly pushed out by the extrusion shaft 24.
As shown in FIG. 12, when the pushing shaft 24 is pushed to a position where the movable plate portion 24k has passed through the return blocking portion 5d ″, the movable portion 24k that has been stored in the storage position until then is moved by the biasing force of the root portion. Then, the movable plate portion 24k rises to the protruding position again in the inclined space 5p in the divided structure portion 5h. The movable plate portion 24k comes into contact with or comes close to the surface on the front end side of the return blocking portion 5d ″. When the movable plate portion 24k comes into contact with the front end surface of the return blocking portion 5d ″, the backward movement of the extrusion shaft 24 is blocked.
The pushing shaft 24 operated to the position shown in FIG. 12 is in a state in which the lens 10 is pushed halfway through the insertion tube 6 by the lens clamping portion 24g at the tip, and the lens 10 is deformed within the insertion tube 6 to some extent. . If the extrusion shaft 24 is pulled back from this state, the lens 10 cannot be properly clamped or pushed by the lens clamping portion 24g even if the extrusion shaft 24 is pushed again in the distal direction.
For this reason, in this embodiment, once the pushing shaft 24 is pushed to the position shown in FIG. 12, the movable plate portion 24k comes into contact with the return blocking portion 5d ″ so that the pushing shaft 24 cannot be pulled back. ing.
As described above, according to the present embodiment, the rear end side portion of the cylindrical member 5 includes the return blocking portion 5d ″ and the split structure portion 5h that can be opened and closed in the circumferential direction. Can be inserted into the cylindrical member 5 from the distal end side of the extrusion shaft 24. Therefore, as compared with the conventional case where the extrusion shaft is inserted from the distal end side of the cylindrical member by having a thin push shaft portion or the like. And can be assembled easily.
In addition, since the collar portion 24c can be formed integrally with the extrusion shaft 24, the number of parts can be reduced compared with the case where the operation portion such as the collar portion is a separate part from the extrusion shaft. Can also be done more easily.
Further, the opening / closing portion 5a ″, the fixing portion 5b, and the hinge portion 5c constituting the divided structure portion 5h are integrally formed with the cylindrical member 5, thereby avoiding an increase in the number of parts due to the provision of the divided structure portion 5h. Can do.
Further, in this embodiment, the movable plate portion 24k provided on the extrusion shaft 24 restricts the movement of the extrusion shaft 24 in the distal direction when an external force is applied to the extrusion shaft 24 in an assembled state (storage state) or the like. To do. In addition, the same movable plate portion 24k prevents backward pulling after the operation of the extrusion shaft 24 for lens extrusion is started. For this reason, it is possible to prevent the extrusion shaft 24 from being unintentionally moved and pulled back with a simple configuration. Further, since the movable plate portion 24k is held at the protruding position unless a pressing force of a certain degree or more is applied, even if there is a dimensional variation such as a manufacturing error, the movable shaft portion 24k is moved inadvertently toward the tip end. Pullback can be prevented.
On the other hand, the movable plate portion 24k is automatically pushed down to the retracted position by the return blocking portion 5d ″ when the pushing shaft 24 is pushed in the tip direction by a certain operating force, so that the pushing shaft 24 moves in the tip direction. The operation can be easily performed without depressing the movable plate portion 24k.
Further, by providing the opening / closing portion 5a ″ with the inclined surface portion 5q ″ that closes the space 5p, the movable plate portion 24k moves over the return blocking portion 5d ″ when a pulling force is applied to the pushing shaft 24. Can be prevented from being deformed and damaged.
In addition, by integrally forming the movable plate portion 24k on the extrusion shaft 24, an increase in the number of parts can be avoided. However, the stopper member having the movable plate portion may be configured as a separate member from the extrusion shaft, and the stopper member may be attached to the extrusion shaft.
In each of the above-described embodiments, the opening / closing portions 5a, 5a ′, 5 ″ and the fixing portion 5b are connected by the hinge portion 5c provided at their radial ends, and the divided structure portion 5h that can be opened and closed by the operation in the circumferential direction is provided. However, the present invention is not limited to this. For example, the opening / closing portions 5a, 5a ′, 5 ″ and the fixing portion 5b are divided in the circumferential direction and hinged at one axial end (tip) thereof. It is good also as providing a part and opening and closing by the operation | movement of the direction orthogonal to an axial direction.
In addition, the divided structure portion may be configured such that a portion corresponding to the opening / closing portions 5a, 5a ′, 5 ″ and a portion corresponding to the fixing portion 5b can be completely separated. In this case, the number of parts increases. However, as in each of the embodiments, compared to the prior art, the extruded shafts 4, 14, and 24 having the cylindrical portions 4f, 14f, and 24f and the flange portions 4c, 14c, and 24c can be inserted into the cylindrical member 5 from the distal end side. Assembly can be facilitated.
Further, in the case of providing such a completely separable divided structure portion, it may be separable and connectable in a direction orthogonal to the axial direction, and portions corresponding to the opening / closing portions 5a, 5a ′, 5a ″ may be fixed portions 5b. It may be possible to separate and couple by sliding in the axial direction with respect to the portion corresponding to.
Furthermore, in the first embodiment, the case where the retaining portion 5d is formed in the entire range from the front end to the rear end of the divided structure portion 5h has been described, but the retaining portion may be formed only in a part of the range. Good.
Further, in the second and third embodiments, the case where the return blocking portions 5d ′ and 5 ″ are provided at the rear end portion of the divided structure portion 5h has been described. However, the return blocking portions 5d ′ and 5d ″ are provided on the divided structure portion 5h. Of these, other axial positions may be provided.
In the second and third embodiments, the case where the divided structure portion 5h is provided with the return blocking portions 5d ′ and 5 ″ for blocking the pulling after the pushing shaft 14 is once pushed in the distal direction is described. However, in addition to the return blocking portions 5d ′ and 5 ″, the retaining portion for preventing the extrusion shafts 14 and 24 from coming back backward from the assembled state, as described in the first embodiment. May be provided.
In each of the above embodiments, the case where the divided structure portion 5h is divided into two has been described. However, in the present invention, the divided structure portion may be divided into a larger number.
Moreover, although each Example demonstrated the case where the collar parts 4c, 14c, and 24c were integrally formed on the extrusion shafts 4, 14, and 24, this invention is not limited to this. That is, an operating portion corresponding to a collar portion or a conventional plunger may be configured as a separate member from the pushing shaft and attached to the pushing shaft.
Further, in each of the embodiments, the case where the shape of the cylindrical member 5 having the divided structure portion 5h is basically a cylindrical shape (including a D-cut shape) is described. However, in the present invention, the shape of the main body is a cylindrical shape. The present invention can also be applied to a case of having a polygonal cross section that is not.
In the second embodiment, the case where the movable plate portions 14k, 14m, and 14n rotate around the hinge portion 14p has been described. However, the present invention is not limited to this, and a movable portion that simply moves in the vertical direction is provided. May be. Further, the protruding direction of the movable plate portion is not limited to the upper side, and any direction may be used as long as the direction is orthogonal to the axial direction. Furthermore, in the second embodiment, the case where the movable plate portions 14k, 14m, and 14n are biased toward the protruding position by the hinge portion 14p has been described. However, the present invention is not limited thereto, and an elastic member such as a spring or rubber is used. You may make it energize using.
The top view and side view of the insertion instrument which are Example 1 of this invention. The top view and side view which show the assembly method of the insertion instrument of Example 1. FIG. The upper surface sectional view and side surface sectional view which show the state which combined the division | segmentation structure part in the insertion instrument of Example 1. FIG. Sectional drawing which expanded a part of FIG. The top view and side sectional drawing of the insertion instrument which are Example 2 of this invention. Side surface sectional drawing of the insertion instrument of Example 2. FIG. Side surface sectional drawing of the insertion instrument of Example 2. FIG. The top view and side surface sectional drawing of the insertion instrument of Example 2. FIG. The top view of the cylinder member which comprises the insertion instrument of Example 2, an axial view, and a side view. The top view and side sectional drawing of the extrusion shaft which comprise the insertion instrument of Example 2. FIG. The top view and side sectional drawing of the insertion instrument which is Example 3 of this invention. The top view and side surface sectional drawing of the insertion instrument of Example 3. FIG. The top view of the cylinder member which comprises the insertion instrument of Example 3, an axial view, and a side view. The top view and side sectional drawing of the extrusion shaft which comprise the insertion instrument of Example 3. FIG. The top view and side view of the conventional insertion instrument. The top view and side view explaining the assembly method of the conventional insertion instrument. The top view and side view explaining the assembly method of the conventional insertion instrument.
4, 14, 24 Extrusion shaft 4a, 14a, 24a D cut shaft portion 4b Stepped portion 4c, 14c, 24c Collar portion 4e, 14e, 24e Push shaft portion 4f, 14f, 24f Cylindrical portion 4h Projection 5 Cylindrical member 5a, 5a ′ 5 ″ opening / closing portion 5b fixing portion 5c hinge portion 5d retaining portion 5d ′, 5d ″ return blocking portion 5i lock claw 5j lock receiving portion 5k groove 5m wall portion 6 insertion tube 10 intraocular lens 14k, 14m, 14n, 24k Movable plate part 14p Hinge part
A main body for accommodating an intraocular lens;
An insertion device for an intraocular lens having an extrusion shaft that pushes the intraocular lens accommodated in the main body into the eye from the tip of the main body,
On the inner side of the main body is provided with a movement blocking portion for blocking the movement of the extrusion shaft by abutting with a radially protruding protrusion provided on the extrusion shaft,
The cylinder member including the movement preventing portion in the main body includes a divided structure portion divided into a plurality of parts so as to include an opening / closing portion that can be opened and closed in a direction around the axis of the main body , and the movement preventing portion is provided in the opening / closing portion. insertion device intraocular lens, characterized in that it is.
An insertion instrument according to claim 1;
An intraocular lens insertion system comprising an intraocular lens accommodated in the main body.
JP2006070748A 2006-03-15 2006-03-15 Intraocular lens insertion device and intraocular lens insertion system Active JP4648859B2 (en)
JP2006070748A JP4648859B2 (en) 2006-03-15 2006-03-15 Intraocular lens insertion device and intraocular lens insertion system
JP2007244570A5 JP2007244570A5 (en) 2007-09-27
JP2007244570A JP2007244570A (en) 2007-09-27
JP4648859B2 true JP4648859B2 (en) 2011-03-09
ID=38589484
JP2006070748A Active JP4648859B2 (en) 2006-03-15 2006-03-15 Intraocular lens insertion device and intraocular lens insertion system
JP (1) JP4648859B2 (en)
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2006-03-15 JP JP2006070748A patent/JP4648859B2/en active Active
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