Method and device for removing a contact lens from a container
View Patent ↗There is described a method for the removal of a contact lens ( 30 ) from a container ( 10 ), with a contact lens ( 30 ) being immersed in a liquid ( 20 ) which is held in a container ( 10 ), and the contact lens ( 30 ) being removed from the container ( 10 ) together with at least a portion of the liquid ( 20 ) through a removal tube ( 3 ) which is dipped into the liquid ( 20 ) within the container ( 10 ). First the container ( 10 ) containing the liquid ( 20 ) and the immersed contact lens ( 30 ) is closed pressure-tight with a lid ( 2 ), which comprises the removal tube ( 3 ) and a pressure tube ( 5 ). Both, the removal tube ( 3 ) and the pressure tube ( 5 ), are guided through the lid ( 2 ). After the closing of the container ( 10 ) with the lid ( 2 ) an overpressure is applied to the interior of the closed container ( 10 ) through the pressure tube ( 5 ). The overpressure is applied such that the contact lens ( 30 ) and the liquid ( 20 ) are pressed into the removal tube ( 3 ) and removed together therethrough. There is also described a device ( 1 ) for carrying out the method.
1. A method for the removal of a contact lens from a container, comprising the steps of providing a contact lens immersed in a liquid in a container, providing a removal tube and dipping the removal tube into the liquid in the container, providing a pressure tube, closing the container containing the liquid and the immersed contact lens pressure-tight with a lid comprising the removal tube and the pressure tube which both are guided through the lid, and applying an overpressure to the interior of the closed container through the pressure tube, such that the contact lens and the liquid are pressed into the removal tube and the contact lens is removed from the container together with at least a portion of the liquid through a removal tube.
2. The method according to claim 1 , wherein the removal tube is dipped into the liquid until its front end is located about 1 mm to about 5 mm above a bottom of the container.
3. The method according to claim 1 , wherein the overpressure which is applied to the interior of the container through the pressure tube is adjusted to about 0.5 bar to about 5 bar above ambient pressure.
4. The method according to claim 1 , wherein the overpressure is established by injecting pressurized air.
5. The method according to claim 1 , wherein an exit opening of a removal tube system is arranged at a level which is lower than that of the bottom of the container.
6. The method according to claim 5 , wherein the overpressure is applied impulse-like with a duration of from about 0.75 seconds to about 2 seconds.
7. The method according to claim 1 , wherein the removal tube at its front end is provided with a funnel having a diameter of about 4 mm to about 9 mm.
8. The method according to claim 1 , wherein a removal tube is selected which has an internal diameter of about 2 mm to about 6 mm.
9. Use of the method according to claim 1 for the removal of a contact lens from a cuvette for optical inspection of contact lenses.