Apparatus and method for monitoring bone-fracture union

Details Apparatus and method for monitoring bone-fracture union Apparatus and method for monitoring bone-fracture union

1984-09-12

1987-03-17

Kamm, William E.

Surgery

Truss

Pad

A61B 510

Patent

active

046499334

ABSTRACT:
A system for monitoring bone union at a bone fracture (13) comprises a fracture cast sleeve (15) to the external surface of which is bonded a transducer (16). Transducer (16) is electrically-conductive and has an electrical resistance which varies with elastic extension and contraction of the transducer. The output of transducer (16) is applied via a resistance-sensitive network (18) to a data evaluating device (20) arranged to normalize signals received from transducer (16) with respect to the time interval during which that signal appears since the signal is of an impulse nature depending upon the rate at which the force is applied to the fracture (13). The normalized signal is further normalized having regard to the mass of the limb concerned and a plurality of such signals are stored in store (30) together with a data log from date data device (32) and these signals are fed to a trend evaluator (34) in order to predict the time interval before bone union occurs.

REFERENCES:
patent: 3791375 (1974-02-01), Pfeiffer
patent: 4152748 (1979-05-01), Arkans
patent: 4195643 (1980-04-01), Pratt, Jr.
patent: 4444205 (1984-04-01), Jackson

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