Patent ID: 7402143

Claim:
A disposable single use bio-filter pad for use in the detection of fetal activity occurrences imparting abdominal displacements to an expectant mother's abdomen at a natural fetal activity frequency signature within the range of 8-25 Hz, the bio-filter pad being intended for use with a discrete transducer sensitive to an expectant mother's abdominal displacements, the bio-filter pad being sized and shaped for conforming to an expectant mother's abdomen and comprising: (a) viscoelastic interior with a topside and an underside substantially opposite and parallel to said topside for respectively facing away from and toward an expectant mother's abdomen, and having a mechanical resonance frequency midway in the range of the 8-25 Hz natural fetal activity frequency signature for amplifying an expectant mother's abdominal displacements on being intimately juxtaposed against her abdomen; (b) peel-off protective liner for exposing an adhesive surface suitable for removable intimate adhesion of at least a portion of said underside onto the expectant mother's abdomen; and (c) a restraining member on said topside for slidingly receiving the transducer in a direction substantially co-directional with said topside and underside for removably intimately mechanically coupling the transducer to a central location on said topside.