Sterile Venturi aspiration
AssigneeThis AG
InventorThomas Köppel
Life of this patent
Estimating the term…
Abstract
The invention relates to an interchangeable insert (1) for an ophthalmological medical device (99) for aspiration of fluid, such as for discharging fluid as part of suction flushing during an ophthalmo-surgical intervention, such as a cataract operation. According to the invention, this occurs by means of a fluid region (10) for receiving the fluid to be suctioned and a negative pressure region (20), to which a negative pressure can be applied. The fluid region (10) and the negative pressure region (20) are hermetically separated from each other by an at least partially flexible membrane (13).
Claims20
A replacement insert for an ophthalmological medical device for aspiration of a liquid, wherein the liquid is to be discharged within a scope of a suction flushing during an ophthalmic surgical intervention, the replacement insert comprising:
- a liquid region having a minimum volume of zero and a maximum volume of greater than 20 milliliters;
- and
- a negative pressure region, to which a pneumatic negative pressure is applicable,
- wherein the liquid region and the negative pressure region are hermetically separated from one another by at least partially a flexible membrane,
- wherein the replacement insert is designed in such a way as to suction the liquid into the liquid region by application of the pneumatic negative pressure,
- wherein the replacement insert is configured to allow for varying a volume of the liquid region for receiving aspirated liquid by at least partial deformation of the flexible membrane by the pneumatic negative pressure,
- wherein the pneumatic negative pressure in the negative pressure region is transferred by the flexible membrane to a hydraulic negative pressure in the liquid region, and the hydraulic negative pressure causes liquid to be aspirated into the liquid region, and
- wherein the liquid region forms a suction chamber for at least temporarily receiving the aspirated liquid.
A method for aspirating a liquid by an ophthalmological device, comprising:
- providing a hermetically closed liquid region, which is formed at least in part by a flexible membrane, in a replacement insert for the ophthalmological device, the liquid region being configured to be hydraulically connected to an aspiration connection, and the liquid region having a minimum volume of zero and a maximum volume of greater than 20 milliliters;
- and
- suctioning air on a side arranged opposite the liquid region on an outer side of the membrane, wherein the outer side is part of a negative pressure region,
- wherein the liquid region is hermetically separated by the membrane from the negative pressure region and from surrounding room air,
- wherein a pneumatic negative pressure in the negative pressure region is transferred by the flexible membrane to a hydraulic negative pressure in the liquid region, and the hydraulic negative pressure causes liquid to be aspirated into the liquid region,
- wherein a volume of the liquid region for receiving aspirated liquid is varied by at least partial deformation of the flexible membrane by the pneumatic negative pressure, and
- wherein the liquid region forms a suction chamber for at least temporarily receiving the aspirated liquid.
A method for providing an aspiration of liquids by an ophthalmological device by negative pressure suctioning, comprising:
- providing a hermetically closed liquid region, which is formed at least in part by a flexible membrane, in a replacement insert for the ophthalmological device, the liquid region being configured to be hydraulically connected to an aspiration connection, and the liquid region having a minimum volume of zero and a maximum volume of greater than 20 milliliters;
- and
- aspirating air on a side arranged opposite the liquid region on an outer side of the membrane, wherein the outer side is part of a negative pressure region,
- wherein the liquid region is hermetically separated from the negative pressure region and from surrounding room air by the membrane,
- wherein a pneumatic negative pressure in the negative pressure region is transferred by the membrane to a hydraulic negative pressure in the liquid region, and the hydraulic negative pressure causes a liquid to be aspirated into the liquid region,
- wherein a volume of the liquid region for receiving aspirated liquid is varied by at least partial deformation of the flexible membrane by the pneumatic negative pressure, and
- wherein the liquid region forms a suction chamber for at least temporarily receiving the aspirated liquid.
Dependencies are inferred from the claim text.