EP0181131A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Apparatus for detecting the resonant frequency of a bone
Assignee: Kent Scientific and Industrial Projects Ltd
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Filing: 1985-10-25
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Granted: —
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Expires: 2005-10-25
Abstract
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.
Inventors
- 👤 Richard James Collier
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-04 05:59
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/45; A61B5/4504; A61B5/103; G; G01; G01H; G01H13/00; A61B5/68; A61B5/6846; A61B5/6867; A61B5/6878
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
75 words
Apparatus for detecting the resonant frequency of a bone including an electro-mechanical transducer (3) arranged to resonate the bone and for application to the external skin surface covering the bone (6), said transducer being in a feed back circuit with an amplifier means (1, 2) having unity gain and a predetermined loop phase of zero, and a display means (7) connected to receive output signals from the amplifier neans for displaying the bone resonant frequency.
Claim 2
Dependent Claim
75 words
Apparatus for detecting the resonant frequency of a bone including an electro-mechanical transducer (3) arranged to resonate the bone and for application to the external skin surface covering the bone (6), said transducer being in a feed back circuit with an amplifier means (1, 2) having unity gain and a predetermined loop phase of zero, and a display means (7) connected to receive output signals from the amplifier neans for displaying the bone resonant frequency.
Claim 3
Dependent Claim
31 words
Apparatus as claimed in claim 1 wherein the resonant frequency of the bone displayed is selected by the response of the amplifier means (1) to be the lowest order transverse mode.
Claim 4
Dependent Claim
44 words
Apparatus as claimed in claim 1 or 2 wherein a pressure micro- switch (5) is positioned in a path between the electro-mechanical transducer (3) and a bone (6) to be measured, said micro-switch (5) being arranged to close the path at a predetermined pressure.
Claim 5
Dependent Claim
14 words
Apparatus as claimed in claim 3 wherein said pressure is approximately 25g/m 2 .
Claim 6
Dependent Claim
39 words
Apparatus as claimed in any preceding claim wherein the transducer includes a mechanical coupling rod (4) and a detecting means and the coupling rod and detecting means are the same element positioned at the same station on a bone.
Claim 7
Dependent Claim
35 words
Apparatus as claimed in any of claims 1 to 5 wherein the transducer includes a mechanical coupling rod (4) and a detecting means and they are separate elements positioned at spaced stations on a bone.
Claim 8
Dependent Claim
22 words
Apparatus as claimed in any preceding claim wherein the display means (7) includes an analogue/digital converter (8) and a digital display (9).
Claim 9
Dependent Claim
71 words
Apparatus for detecting the resonant frequency of a bone including an electro-mechanical transducer (3) arranged to resonate the bone and for direct application to the bone (6), said transducer (3) being in a feed-back circuit with an amplifier means (1, 2) having unity gain and a predetermined loop phase of zero, and a display means (7) connected to receive output signals from the amplifier means for displaying the bone resonant frequency.
Claim 10
Dependent Claim
71 words
Apparatus for detecting the resonant frequency of a bone including an electro-mechanical transducer (3) arranged to resonate the bone and for direct application to the bone (6), said transducer (3) being in a feed-back circuit with an amplifier means (1, 2) having unity gain and a predetermined loop phase of zero, and a display means (7) connected to receive output signals from the amplifier means for displaying the bone resonant frequency.
References Cited (Backward Citations)
No citation records indexed.
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