Automatic dose meter and control circuit arrangement

Details Automatic dose meter and control circuit arrangement Automatic dose meter and control circuit arrangement

1985-07-01

1986-09-30

Kamm, William E.

Surgery

Truss

Perineal

A61H 100

Patent

active

046141782

DESCRIPTION:

BRIEF SUMMARY
TECHNICAL FIELD

This invention relates to an automatic dose meter and control circuit arrangement, especially for ultrasonic therapeutic apparatus.


BACKGROUND ART

Ultrasonic therapy is a well known and applied method in the area of physiotherapy.
During ultrasonic therapy ultrasonic energy is transmitted by means of a treatment head to the part of the body to be treated and its biological effect depends on the quantity of the ultrasonic energy transmitted to the patient's body. The ultrasonic energy exerts its health-giving effect in the body in two ways: directly influences the irradiated organ, on one hand in the form of mechanical and heating effects, on the other hand indirectly, i.e. transmitted by the sympathetic system. The ultrasonic therapy can be applied especially advantageously in the cases of rheumatological diseases, spinal complaints and in certain types of inflammations.
The efficiency of ultrasonic therapy depends to a great extent on the dose received by the patient. In order to ensure that the ultrasonic vibrations generated by the treatment head can penetrate into the patient's body, an appropriate coupling medium should be provided between the patient's body and the treatment head containing a piezo-electric converter. In the case, when the coupling between the patient's body and the treatment head is inappropriate, the efficiency of the treatment will decrease and the treatment itself becomes less reproducible. An inappropriate coupling can result from a coupling medium of low ultrasonic conductivity, from a low quantity of the coupling medium, from air bubbles in the coupling medium and the uneveness of the surface of the human body.
In the course of the treatment a continuously optimal coupling can not be guaranteed between the patient's body and the treatment head. This means that the intensity of ultrasonic energy I.sub.k measured on the body of the patient (ultrasonic energy pro surface unit, W/cm.sup.2) will not always be equal to the intensity of the ultrasonic energy measured on the treatment head. As a consequence, the patient will not get the predetermined dose. Hence the coupling factor can vary within broad limits and, in the known apparatus, there is no treatment time correction, the patient gets only a part of the necessary dose. Such known apparatus are made by the firms, as follows:


OBJECT OF THE INVENTION

The object of the present invention is to provide an apparatus, especially for ultrasonic therapy, by determining which of the doses received by the patient's body is approximately equal to the predetermined dose and wherein the volume of the received dose can be controlled, whereby the difficulties and drawbacks previously described can be eliminated.


DISCLOSURE OF THE INVENTION

Accordingly, the invention provides an automatic dose meter and control circuit therefor, comprising an ultrasonic generator, a power control circuit and a timer circuit connected to the inputs thereof, a detector circuit, a divider circuit and a treatment head connected to the outputs of the ultrasonic generator, a clock generator connected to the output of a control circuit, wherein the input of the power control circuit is connected to an other output of the control circuit.
In accordance with an aspect of the present invention, the task is solved in such a manner that the output of the ultrasonic generator providing an output signal proportional to the change in intensity on the patient side is connected by means of the detector circuit with an input of a difference circuit, the other output thereof providing an output signal proportional to the intensity of the ultrasonic signal measured on the treatment head is connected by means of the divider circuit to the other input of the difference circuit and to the input of a second divider circuit; the output of the difference circuit is connected to the input of the control circuit, and wherein the output of the second divider is connected to the other input of the control circuit, the output of this control circuit is connected wi

REFERENCES:
patent: 4315514 (1982-02-01), Drewes et al.
patent: 4390026 (1983-06-01), Christman
patent: 4432236 (1984-02-01), Nagasaki

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