Intraocular lens insertion device
There is provided an intraocular lens insertion device capable of appropriately regulating the motion of a rear supporting portion during a process of moving an intraocular lens, and reducing the possibility of reoperation being required after the intraocular lens is inserted into an eye. An intraocular lens insertion device 1 comprises a main body 2 , and a slider 3 and a plunger 4 that are attached to the main body 2 . Further, the intraocular lens insertion device 1 is of a preset type in which an intraocular lens 5 is placed inside the main body 2 in advance. The slider 3 includes a first abutting portion 21 for pushing up a supporting portion 7 (rear supporting portion 7 a ) arranged on a rear side of an optical part 6 with respect to a lens advancement axis A, and second abutting portions 22 a , 22 b abutting against an outer edge of a rear portion of the optical part 6.
1. An intraocular lens insertion device, comprising:
a lens placement section;
a nozzle section;
a transition section, having a tapered inner wall, between the lens placement section and the nozzle section;
the lens placement section, transition section and nozzle section defining a lens advancement axis;
an intraocular lens located in the lens placement section and having an optical part with an outer edge, a first support portion that extends outwardly from the optical part outer edge, and a second support portion that extends outwardly from the optical part outer edge, the second support portion being closer to the nozzle section than the first support portion;
a slider, movable relative to the lens placement section, that pushes the intraocular lens along the lens advancement axis in a lens advancement direction out of the lens placement section and into the transition section, the slider including first and second abutting portions spaced from one another in the lens advancement direction by a distance that results in the first abutting portion bending the first support arm toward the optical part when the second abutting portion engages optical part outer edge, the second abutting portion including an x-direction abutting surface having a face substantially perpendicular to a surface of the optical part and a y-direction abutting surface having a face substantially parallel with the surface of the optical part; and
a plunger, movable relative to the slider, that pushes the intraocular lens out of the transition section and through the nozzle section.
2. The intraocular lens insertion device according to claim 1 , wherein the second abutting portion comprises a pair of second abutting portions located on opposite sides of the lens advancement axis.
3. The intraocular lens insertion device according to claim 1 , wherein the first abutting portion slants downward in the lens advancement direction.
4. The intraocular lens insertion device according to claim 1 , further comprising:
a guide that directs the optical part outer edge to the second abutting portion.
5. The intraocular lens insertion device according to claim 2 , wherein the pair of second abutting portions are equidistant from the lens advancement axis.
6. The intraocular lens insertion device according to claim 1 , wherein
the plunger moves along the lens advancement axis;
the first and second support portions define free ends;
the first abutting portion bends the first support portion to an orientation where the first support portion crosses the lens advancement axis; and
the plunger is configured to further bend the first support portion, such that the free end of the support portion is positioned over the optical part, as the plunger moves relative to the slider and into contact with the optical part outer edge.
7. The intraocular lens insertion device according to claim 1 , wherein
the plunger moves along the lens advancement axis;
the first and second support portions define free ends;
the first abutting portion bends the first support arm to an orientation where the first support arm crosses the lens advancement axis; and
the plunger is configured to further bend the first support arm, such that the free end of the support arm is positioned over the optical part and points toward the nozzle section, as the plunger moves relative to the slider and into contact with the optical part outer edge.
8. The intraocular lens insertion device according to claim 1 , wherein
the slider includes a pivotable lens pressing member.
9. An intraocular lens insertion device, comprising:
a lens placement section;
a nozzle section;
a transition section, having a tapered inner wall, between the lens placement section and the nozzle section;
the lens placement section, nozzle section and transition section defining a lens advancement axis;
an intraocular lens located in the lens placement section and having an optical part with an outer edge, a leading haptic, and a trailing haptic;
a slider, movable relative to the lens placement section, that pushes the intraocular lens along the lens advancement axis out of lens placement section and into the transition section, the slider including means for folding a portion of the trailing haptic toward the optical part as the slider engages the optical part outer edge; and
a plunger, movable relative to the slider, that pushes the intraocular lens out of the transition section and through the nozzle section.
10. An intraocular lens insertion device as claimed in claim 9 , wherein
the plunger includes a surface that engages the optical part outer edge and a protrusion that extends over the optical part outer edge.
11. An intraocular lens insertion device as claimed in claim 9 , wherein
the plunger is configured to push the folded portion of the trailing haptic over the optical part as the plunger engages the optical part outer edge.
12. An intraocular lens insertion device as claimed in claim 9 , wherein
the trailing haptic includes a free end; and
the plunger is configured to push the folded portion of the trailing haptic over the optical part such that the free end points toward the nozzle section as the plunger engages the optical part outer edge.
13. An intraocular lens insertion device as claimed in claim 9 , wherein
the slider includes a pivotable lens pressing member.