Implant evaluation using acoustic emissions

A loosened implant 320 within a joint in the human body may be detected from acoustic emissions produced in the joint when the joint moves. A plurality of acoustic sensors 340, 342, 344 are arranged around the joint. A processor receives signals from at least two of the sensors and compares an attri...

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Bibliographic Details
Main Authors Graham Oliver Ross, Herman Louis Lelie, Pauldeep Singh Mann
Format Patent
LanguageEnglish
Published 08.07.2020
Subjects
DIAGNOSIS
HUMAN NECESSITIES
HYGIENE
IDENTIFICATION
MEDICAL OR VETERINARY SCIENCE
SURGERY
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Summary:A loosened implant 320 within a joint in the human body may be detected from acoustic emissions produced in the joint when the joint moves. A plurality of acoustic sensors 340, 342, 344 are arranged around the joint. A processor receives signals from at least two of the sensors and compares an attribute of the sensed signals to determine a location of the acoustic emission within the joint. An indication of the health of the joint is then output. The position of the emitted noise may be calculated from the time delay between received signals. The velocity of sound within the tissues may be accounted for. The amplitude difference between the signals may also be used to determine the point of origin of the sound. The apparatus may comprise sensors in a wearable device (figure 1E) which is wrapped around the joint and used to detect signals when the patient moves. The apparatus may be particularly suited to sensing loose replacement knee implants.
Bibliography:Application Number: GB20200001767