Process and device for the in vivo measurement of bone consolidation
First Claim
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1. A process for detecting in vivo the degree of consolidation of a fractured bone, comprising the steps of:
- implanting a transmitter with its power supply, said transmitter comprising a blocking oscillator having as a transformer a high permeability ferrite torus implanted on the surface of said bone, the frequency of oscillation of said transmitter varying about a predetermined value in response to any stresses applied to said bone;
applying a known force to said bone; and
receiving the signals emitted by said transmitter.
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Abstract
A process for the measurement in vivo of the degree of bone consolidation, characterized in that it consists of implanting directly on the surface of the bone a transmitter with its power supply circuit, the oscillation frequency of the transmitter being capable of varying about a predetermined value during stresses applied to the bone to which the transmitter is secured. Signals emitted by the transmitter are received on a suitable external receiver positioned adjacent the transmitter. The receiver output signals are utilized for various purposes, such as checking, measurement and recording.
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Citations
9 Claims
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1. A process for detecting in vivo the degree of consolidation of a fractured bone, comprising the steps of:
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implanting a transmitter with its power supply, said transmitter comprising a blocking oscillator having as a transformer a high permeability ferrite torus implanted on the surface of said bone, the frequency of oscillation of said transmitter varying about a predetermined value in response to any stresses applied to said bone; applying a known force to said bone; and receiving the signals emitted by said transmitter. - View Dependent Claims (2, 3, 4, 5)
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6. Apparatus, which comprises:
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means for detecting and measuring in vivo the degree of consoldiation of a fractured bone comprising means for transmitting an oscillating signal whose frequency of oscillation varies about a predetermined value in response to stress applied to said bone;
said transmitting means including a power supply and a blocking oscillator having a transformer for detecting the stress applied to said bone and comprising a high permeability ferrite torus;further comprising an osteosynthesis plate to which said ferrite torus is adhered, said plate adapted to be secured to said bone; and means positioned in the vicinity of said transmitting means for receiving said oscillating signal. - View Dependent Claims (7, 8, 9)
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Specification