公开(公告)号：EP0181131A2

公开(公告)日：1986-05-14

申请号：EP85307734.5

申请日：1985-10-25

Applicant: Kent Scientific and Industrial Projects Limited

Inventor： Collier, Richard James

IPC: A61B5/10 ,  A61B9/00 ,  G01H13/00

CPC classification number: A61B5/4504 ,  A61B5/103 ,  A61B5/6878 ,  G01H13/00

Abstract: @ An apparatus for detecting resonant frequency of bones has an electro-mechanical transducer arranged for application to the external skin surface covering a bone, the transducer being in a feed-back circuit with an amplifier and phase shifter having a unity gain and a loop phase of zero. The feed-back circuit is connected to a display comprising an A-D converter and a digital display. The apparatus displays the lowest order transverse mode set up in a bone.
In a further embodiment the transducer is arranged to pierce the skin and to be in direct contact with a bone. The transducer has a coupling rod and a detector which may be both positioned at the same station on a bone or at spaced stations along a bone.

公开(公告)号：EP0181131A3

公开(公告)日：1987-05-20

申请号：EP85307734

申请日：1985-10-25

Applicant: Kent Scientific and Industrial Projects Limited

Inventor： Collier, Richard James

IPC: A61B05/10 ,  A61B09/00 ,  G01H13/00

CPC classification number: A61B5/4504 ,  A61B5/103 ,  A61B5/6878 ,  G01H13/00

Abstract: @ An apparatus for detecting resonant frequency of bones has an electro-mechanical transducer arranged for application to the external skin surface covering a bone, the transducer being in a feed-back circuit with an amplifier and phase shifter having a unity gain and a loop phase of zero. The feed-back circuit is connected to a display comprising an A-D converter and a digital display. The apparatus displays the lowest order transverse mode set up in a bone. In a further embodiment the transducer is arranged to pierce the skin and to be in direct contact with a bone. The transducer has a coupling rod and a detector which may be both positioned at the same station on a bone or at spaced stations along a bone.