摘要:
Apparatuses for restricting fluid flow through a well conduit comprise a tubular member having a seat member disposed within the tubular member for receiving a plug element. One or both of the seat member or the plug element comprise at least one shape-memory material to facilitate the plug element being able to land on the seat and/or to facilitate the plug element to pass through a seat member or other restriction in the tubular member either before or after landing on a seat.
摘要:
Apparatuses for restricting fluid flow through a well conduit comprise a tubular member having a seat member disposed within the tubular member for receiving a plug element. One or both of the seat member or the plug element comprise at least one shape-memory material to facilitate the plug element being able to land on the seat and/or to facilitate the plug element to pass through a seat member or other restriction in the tubular member either before or after landing on a seat.
摘要:
A device and method for enhancing the surgical replacement of defective natural eye lenses with an intraocular lens. The device is an intraocular lens injector that prevents an intraocular lens from uncontrollably rotating or flipping as it is advanced towards a mammalian recipient's eye, while providing an ideal lens exit orientation to help reduce the occurrence of trauma. The lens injector comprises an insertion tube having a loading port and an ejection port, a plunger, a loading carriage, and a lens carrier. In one embodiment, the insertion tube allows for the controlled insertion of a lens by rolling one side of the lens onto itself as the lens is guided through the ejection port using a guide displaced in the insertion tube from a position near the loading port to the end of the ejection port. In an alternative embodiment, controlled insertion is achieved by rolling both sides of the lens at varying degrees so that one side eventually encircles the other side.