Intraocular lens inserting device
An intraocular lens insertion device ( 1 ) includes a main body ( 2 ), an operational portion ( 3 ) provided on an end ( 2 a ) of the main body ( 2 ), a knock mechanism ( 4 ) for moving the operational portion ( 3 ) forward and backward with respect to the main body ( 2 ), and a cartridge ( 5 ) attached to the other end ( 2 b ) of the main body ( 2 ) and serving as an insertion tube. The device is constructed, as a whole, such that the knock mechanism ( 4 ) moves the operational portion ( 3 ) repeatedly forward and backward so that an intraocular lens ( 6 ) placed in the cartridge ( 5 ) can be pushed out stepwise. The knock mechanism ( 4 ) is structured so as to move the operational portion ( 3 ) pushed forward toward a backward direction and automatically return it to an original position prior to the same being pushed forward.
1. An intraocular lens insertion device, comprising:
a main body with a lens advancement axis extending therethough;
a rod that defines a length and is movable along the lens advancement axis in a forward direction from an initial pre-use position to a fully extended position;
a plunger that defines a length and is movable relative to the main body along the lens advancement axis with the rod in the forward direction from a return position, which defines a proximal-most position of the plunger, to a push-out position, which defines a distal-most position of the plunger, and is movable relative to the main body along the lens advancement axis away from at least a portion of the rod in a rearward direction from the push-out position to the return position; and
a bias element that biases the plunger to the return position by applying a force in the rearward direction to the plunger that drives the plunger to the return position;
wherein the pre-use position of the rod, the return position of the plunger and the respective lengths of the rod and the plunger are such that a first movement of the plunger from the return position to the push-out position will result in only partial movement of the rod from the pre-use position to the fully extended position.
2. An intraocular lens insertion device as claimed in claim 1 , wherein
the rod includes a latch with a deflectable locking piece and a latch protrusion carried by the deflectable locking piece;
the main body includes an inner surface and a concave region on the inner surface; and
the latch protrusion is located within the concave region when the rod is in the pre-use position.
3. An intraocular lens insertion device as claimed in claim 2 , wherein
the main body includes a main body protrusion on the inner surface that is offset in the forward direction from the concave region; and
the latch protrusion will pass over the main body protrusion during the first movement of the plunger from the return position to the push-out position.
4. An intraocular lens insertion device as claimed in claim 3 , wherein
the rod further includes a sliding body, defining a forward end and a rearward end, and a shaft extending forwardly from the forward end of the sliding body;
the latch extends rearwardly from the rearward end of the sliding body;
the plunger engages and pushes the rearward end of the sliding body during the first movement of the plunger from the return position to the push-out position; and
the plunger pushes the latch during a second movement of the plunger from the return position to the push-out position that results in movement of the rod to the fully extended position.
5. An intraocular lens insertion device as claimed in claim 4 , wherein
the plunger disengages from the rearward end of the sliding body as the plunger moves in the rearward direction from the push-out position to the return position.
6. An intraocular lens insertion device as claimed in claim 1 , wherein
the main body is configured to receive a cartridge.
7. An intraocular lens insertion device as claimed in claim 1 , further comprising:
a cartridge;
wherein the main body is configured to receive the cartridge.
8. An intraocular lens insertion device as claimed in claim 1 , wherein
the main body includes an integral lens placement portion, transition portion and nozzle.
9. An intraocular lens insertion device as claimed in claim 8 , further comprising:
an intraocular lens stored in the lens placement portion.
10. An intraocular lens insertion device as claimed in claim 1 , wherein
the bias element comprise a coil spring.
11. An intraocular lens insertion device as claimed in claim 1 , wherein
the main body defines a rearward end; and
the bias element is located between the rearward end of the main body and a portion of the plunger.
12. An intraocular lens insertion device as claimed in claim 1 , wherein
the plunger and the rod are not secured to one another.
13. An intraocular lens insertion device, comprising
a main body with a lens advancement axis extending therethough;
a rod that defines a length and is movable along the lens advancement axis in a forward direction from an initial pre-use position to a fully extended position;
a plunger that defines a length and is movable relative to the main body along the lens advancement axis with the rod in the forward direction from a return position to a push-out position and is movable relative to the main body along the lens advancement axis away from at least a portion of the rod in a rearward direction from the push-out position to the return position; and
a bias element that biases the plunger to the return position by applying a force in the rearward direction to the plunger that drives the plunger to the return position;
wherein the pre-use position of the rod, the return position of the plunger and the respective lengths of the rod and the plunger are such that a first movement of the plunger from the return position to the push-out position will result in only partial movement of the rod from the pre-use position to the fully extended position; and
wherein the respective lengths of the rod and the plunger are such that a second movement of the plunger from the return position to the push-out position will result in movement of the rod to the fully extended position.