SU1228817A1 - Neurological hammer - Google Patents

Description

This invention relates to medical instruments used in the neurological examination of humans.

The aim of the invention is to determine the threshold impact force causing a reflex.

FIG. 1 shows a neurological hammer, a general view; in fig. 2 - node I in FIG. I (hammer head with a piezoelectric element, working in compression); in fig. 3 - the same, (shock head with a piezoelectric element, working on the impact of shear force).

The neurological hammer contains a hollow shock head 1, a handle 2 connected by an L-shaped tube 3. Esteziometers 4 are installed inside the head with individual mechanisms of movement 5 and 6. In the shock head an additional cavity 7 is made, in which sleeve 8 with the rod 9, the piezoelectric element 10 are placed , inertial mass 11 and spring 12, securing them to the rod. The additional cavity is closed by a plug 13. The electric cable 14, which extends from the piezoelectric element 10 through the groove 15 and the tube 16, is led through the rod to the end of the handle to the output terminals 17 of the hammer. By means of the connector 18, the hammer is connected to the measuring device 19.

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The neurological hammer is used as follows.

Apply a blow with the hammer head 1 on certain areas of the patient's body. Under the influence of a shock load, the inertial mass 11 acts on the piezoelectric element 10 with a force proportional to the acceleration. As a result of the direct piezoelectric effect

 Electric charges arise on the electrodes of the piezoelectric element. The magnitude of the charge is determined and recorded by a measuring device 19 connected to the input terminals 17 of the hammer.

The operation of the hammer on the shear force is also based on the direct piezoelectric effect, but here the 2Q mechanical design contributes to the shear force that occurs when the direction of impact force deviates from the longitudinal axis of the rod.

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Thus, the study of reflexes using a neurological hammer of this design constitutes an important part of the neurological examination of patients and persons undergoing professional selection, and also significantly speeds up the process of learning and acquiring relevant experience.

 Figg

Editor G. Gerber

Compiled by A. Shpikalov Tehred M. Khodanych

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Proofreader A. Obruchar

Order 2332/2 Circulation 660 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, st. Project, 4

Claims (1)

(57 Neurological hammer containing a hollow shock head and handle, esthesiometers installed in the head cavity and having individual mechanisms of movement, characterized in that, in order to determine the threshold impact force causing the reflex, the hammer is equipped with a sleeve with a rod, a piezoelectric element with an electric cable, an inertial a mass, a spring, and a measuring device connected to the cable, the piezoelectric element, the inertial mass, and the spring mounted on the core of the sleeve, and the sleeve is fixed in an additional cavity, made in the shock head and provided with a stopper.