Ophthalmic implant injector and folding cartridge
A cartridge for folding an ophthalmic implant including pliers having two articulated arms which are provided with substantially coaxial channels and each of which is boarded by two longitudinal edges. The channels are open in front of each other and define a partially folded conduit containing the implant when the two arms are brought to each other. When the two arms are brought to each other, at least two edges positioned in front of the channels are driven apart transversally with respect to a conduit on a plane. The two arms are jointed in such a way that the arm delimits the supporting shoulder of the implant being projected in front of the channel embodied in the other arm.
1. A cartridge ( 12 ) for folding an ophthalmic implant ( 11 ) comprising:
a clamp formed by two articulated arms ( 34 , 36 ), said two arms ( 34 , 36 ) having substantially coaxial channels ( 46 , 48 ), each of which is bordered by two longitudinal edges ( 46 A, 46 B, 48 A, 48 B), the channels ( 46 , 48 ) opening opposite one another and, when the two arms ( 34 , 36 ) are closed together, defining a conduit for containing the partially folded implant ( 11 ),
characterised in that when said two arms ( 34 , 36 ) are closed together, at least two of the edges ( 46 B, 48 B) facing the two channels ( 46 , 48 ) are transversely displaced relative to the conduit in the joining plane of said two arms ( 34 , 36 ) in such a way that one arm ( 36 ) defines a flat shoulder ( 49 ) between said two edges ( 46 B, 48 B), the shoulder ( 49 ) extending from one edge ( 46 B) to the other edge ( 48 B), the shoulder ( 49 ) supporting the implant ( 11 ) in a manner that ensures that opposite ends of the implant ( 11 ) are correctly radially displaced and superimposed, the shoulder ( 49 ) projecting opposite the channel ( 46 ) arranged in the other arm ( 34 ), and in that one ( 48 B) of the two edges ( 46 B, 48 B) defining the shoulder ( 49 ) diverges from the other edge ( 46 B) in the direction of an end of the cartridge ( 12 ), said one edge ( 48 B) diverting towards the inside of the conduit defined by the two channels ( 46 , 48 ).
2. The cartridge according to claim 1 , characterised in that the shoulder ( 49 ) is on average between 0.1 and 0.8 mm wide in the joining plane, measured transversely to the direction of the channels.
3. The cartridge according to claim 1 , characterised in that the two displaced edges ( 46 B, 48 B) are further away from an axis of articulation ( 38 ) of the two arms ( 34 , 36 ) than the two other edges ( 46 A, 48 A) which meet when the two arms ( 34 , 36 ) are closed together.
4. The cartridge according to claim 1 , characterised in that the cartridge comprises an injection cannula ( 40 ), of which the internal surface converges inside the extension of the conduit containing the implant ( 11 ) when the two arms are closed together.
5. The cartridge according to claim 1 , characterised in that the two channels ( 46 , 48 ) have a substantially semi-circular or semi-elliptical cross-section.
6. The cartridge according to claim 1 , characterised in that the shoulder ( 49 ) is substantially planar and the axis of the conduit formed by the two channels ( 46 , 48 ) extends substantially into the plane defined by the shoulder ( 49 ).
7. The cartridge according to claim 3 , characterised in that each arm ( 34 , 36 ) has, beyond the channel ( 34 , 36 ) and on the side opposite the axis of articulation ( 38 ), a maneuvering flange ( 50 , 52 ), and the shoulder ( 49 ) extends in the plane of a flange ( 52 ) for maneuvering one of the arms ( 48 ).
8. The cartridge according to claim 1 , characterised in that the two arms ( 34 , 36 ) comprise, next to the edges ( 48 A, 48 B) of the channels and outside the channels, complementary projecting and hollow connection profiles ( 62 , 64 ), distinct from the shoulder ( 49 ), which are of such a size that the profiles fit together when the two arms ( 34 , 36 ) are closed together.
9. An implant injector comprising a cartridge according to claim 1 , and an injection mechanism comprising a body for linking to the cartridge and a plunger capable of pushing the implant contained inside the cartridge.
10. The cartridge according to claim 4 , characterized in that the shoulder ( 49 ) has a general triangular shape with a width that increases in size towards the cannula ( 40 ).