초록 ▼

An obstetrical vacuum extractor has a bell-shaped cup with an open edge in communication with a hollow stem. A plurality of apertures in the cup prevent a vacuum from being drawn within the cup when the open end is brought into contact with a fetal scalp, in the absence of a sheet liner adapted to f

An obstetrical vacuum extractor has a bell-shaped cup with an open edge in communication with a hollow stem. A plurality of apertures in the cup prevent a vacuum from being drawn within the cup when the open end is brought into contact with a fetal scalp, in the absence of a sheet liner adapted to fit within the interior of the cup, engage its open edge, and having a central hole adapted to communicate with the hollow stem so that a vacuum may be drawn within the liner. The liner surface preferably includes a foil layer and covers the apertures so that the vacuum may be drawn.

대표청구항 ▼

I claim: 1. A vacuum extractor adapted to be applied to a fetal scalp, comprising: a bell-shaped cup having an open edge; an elongated, hollow stem communicating at one end with the cup and at the opposite end with a vacuum source; a plurality of relief areas formed in the cup which prevent a vacuu

I claim: 1. A vacuum extractor adapted to be applied to a fetal scalp, comprising: a bell-shaped cup having an open edge; an elongated, hollow stem communicating at one end with the cup and at the opposite end with a vacuum source; a plurality of relief areas formed in the cup which prevent a vacuum from being drawn within the cup when a vacuum supplied from the source and the open edge of the cup is brought into contact with a fetal scalp; and a sheet liner adapted to be inserted into the interior of the cup and having a central hole adapted to communicate with the interior of the hollow stem and a surface adapted to close off the relief areas so as to allow a vacuum to be drawn when the extractor cup, with the liner, is inserted into contact with a fetal scalp. 2. The extractor of claim 1, in which the relief areas comprise holes formed in the surface of the cup. 3. The extractor of claim 1, in which the relief areas comprise scallops formed along the edge of the cup. 4. The extractor of claim 1, wherein the liner is formed of sheet material having a foil layer.