RU2423074C2 - Device for measuring muscle strength of extensors and flexors of lower extremity - Google Patents

Abstract

FIELD: medicine.

SUBSTANCE: invention relates to medicine, namely to traumatology and orthopedics. Device for measuring muscle strength of extensors and flexors of lower extremity contains frame and dynamometre. On frame fixed are handle, brackets, through which passed is slider with prop, dynamometre with scale and runner, as well as plate-guide with protractor. On protractor with ability to move fixed is pointer and reference points are marked. Reference point is also marked on plate-guide. Slider is made with ability to move together with bridge, moved out element and dynamometre runner, which is connected with said bridge by means of moved out element.

EFFECT: invention ensures measurement of muscle strength of flexors and extensors of foot and shin, muscle strength being estimated not on the basis of subjective sensations of examiner, but on the basis of indices readings of calibrated mechanical device, which is mobile, one-piece, convenient in application.

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Description

The invention relates to medicine, namely to traumatology and orthopedics.

Analog: Device for dynamography of the muscles of the flexors and extensors of the foot (Lvov S.E., Russian S.V., Shapin V.I., Veshutkin V.D., Smirnov G.V., Kolodina I.G., Vadakadat M. K. Patent of the Russian Federation 2134063, А61В 5/22, application No. 98102692/14 dated 02.16.1998).

The device for dynamography of the muscles of the flexors and extensors of the foot consists of a metal frame on a fixed base, a support platform for the foot with fixing straps connected to the frame using a rotary mechanism on ball bearings, the axis of rotation of which coincides with the axis of rotation in the ankle joint when adjusted with screws, dynamometer, consisting of an elastic steel quadrangular frame with four glued strain gauges glued together by a bridge, and mounted on a rotating I’m in a frame that allows you to move the dynamometer when examining the strength of the flexors and extensors of the foot in space, at various angles of flexion and extension in the ankle joint, the rotating frame is adjusted and secured with screws, the hip is fixed during research using the support platform for the thigh, straps for pressing the hips, moving along two guide rods and located on a fixed base, screws for fixing the supporting platform for the thigh on the guide rods when examining Vania.

General management and automation of dynamometer tests, static analysis, calculation of static muscle effort and the decision made on the test results is carried out using standard digital analog converters, a computer. This device allows you to increase accuracy with dynamometric studies and conduct functional diagnostics, evaluate the musculoskeletal system and determine the effectiveness of treatment measures. The device allows you to register and analyze the following indicators of static muscle effort.

The device is used as follows. The foot of the subject is located on the supporting platform for the foot and is fixed with straps. Using screws, the axis of rotation of the rotary mechanism is compared with the axis of the ankle joint. In the study of indicators of the static muscular effort of the flexors of the foot, the dynamometer is moved to its highest position using a rotating frame, which is fixed with screws. Then the patient’s hips are fixed in the lower third on the thigh support platform using the thigh pressure plate, the latter is adjusted by two guide rods and fixed with screws. When a foot presses on a reference pad, the signal from the amplifier is transmitted to a computer through a digital analog converter. In the study of indicators of static muscular effort of the flexors of the foot, the dynamometer is moved to its lowest position on the rotating frame.

The definition of muscle strength with the help of the researcher’s hand is known (Traumatology and Orthopedics / Manual for Doctors: In 3 volumes. T.1. Edited by Yu.G. Shaposhnikov. - M .: Medicine, 1997. - 656 p.), With active movements and resistance exerted by the hand of the researcher. There are six degrees of muscle strength. The strength of the unaffected muscles is taken as the initial one - 100%, with 5 points it corresponds to the full range of active movements with overcoming the mass of the limb and sufficient external resistance; 4 points - a good function (75% of the function of a healthy limb), while there is a full range of active movements with overcoming the mass of the limb, but with reduced resistance to additional load; 3 points - a satisfactory rating (50% of the remaining strength), the full range of movements with overcoming the mass of the limb, but the inability to overcome the slightest resistance; 2 points - poor muscle function (25% of retained strength), characterized by a full range of movements with overcoming a reduced (thanks to the support of the doctor’s hand) mass of the limb; 1 point - a very poor score (5% of the remaining strength): the muscle is only capable of tension, but is not able to provide active movements in the joint; 0 points is a very poor assessment: the muscle is completely paralyzed and is not even capable of active tension.

Prototype: Dynamometer (Smirnov G.V., Veshutkin V.D., Buylova T.V., Donchenko. RF patent 2135081, class А61В 5/22, No. 98101535/14 dated 01/28/1998). The dynamometer consists of an elastic element made in the form of two flat beams having thickenings at the ends and in the middle. End thickenings are used to connect two beams with screws, and medium thickenings are used to fasten the support element in the form of a handle and rod with a gimbal assembly. Strain gages are glued to the elastic element. Strain gages are combined in a bridge measuring circuit in such a way that the electrical signal from it, proportional to the deformation of the elastic element, corresponds only to the measured force applied to the handle and traction. To protect the strain gauges and electrical installation from mechanical damage, the elastic element is enclosed in a box-shaped case. The dynamometer is used as follows. The thrust is strengthened to a fixed massive base. The patient pulls the handle with a brush, while bending elastic deformations occur in the elastic element, which are transformed with the help of strain gauges and a bridge circuit into an electrical signal. The electrical signal is proportional to the deformation of the elastic element and, therefore, proportional to the acting force. An electrical signal is recorded by a recorder, recorder, voltmeter.

The disadvantages of the prototype device are:

The design of the dynamometer does not provide measurements of the strength of the muscles of the lower limb, since it involves measurements when the handle of the device is drawn by the patient’s brush.

The design of the dynamometer provides measurement of only the strength of the flexors.

The aim of the invention is to measure the muscle strength of the flexors and extensors of the foot and lower leg.

The invention:

Proposed as an invention, the device is shown in figures 1 and 2, where

- frame (figure 1, position 1; figure 2, position 1)

- pen (Fig. 1, item 2)

- bracket (figure 1, position 3)

- bracket (figure 1, position 4)

- slider (figure 1, position 5; figure 2, position 5)

- emphasis (figure 1, pos.6)

- dynamometer (figure 1, position 7; figure 2, position 7)

- scale (figure 1, position 8; figure 2, position 8)

- slider (figure 1, position 9; figure 2, position 9)

- bridge (figure 1, position 10; figure 2, position 10)

- the guide plate (figure 1, position 11; figure 2, position 11)

- protractor (figure 1, item 12)

- landmark (figure 1, pos.13)

- landmark (figure 1, pos. 14)

- landmark (figure 1, pos. 15)

- arrow (Fig. 1, item 16)

- retractable element (figure 2, pos.17)

A device for measuring the strength of the muscles of the extensors and flexors of the lower extremity consists of a frame (figure 1, position 1; figure 2, position 1), on which a handle (figure 1, position 2) is attached, an arm (figure 1 , pos. 3) and the bracket (Fig. 1, pos. 4). Through the bracket (Fig. 1, pos. 3) and the bracket (Fig. 1, pos. 4) a slider (Fig. 1, pos. 5; Fig. 2, pos. 5) with a stop (Fig. 1, pos. 6).

A dynamometer is attached to the frame (Fig. 1, Pos. 1; Fig. 2, Pos. 1) (Fig. 1, Pos. 7; Fig. 2, Pos. 7) with a scale (Fig. 1, Pos. 8; Fig. .2, pos. 8) (the division price is 1 kgf) and a slider (Fig. 1, pos. 9; Fig. 2, pos. 9). The runner (Fig. 1, Pos. 9; Fig. 2, Pos. 9) and the dynamometer (Fig. 1, Pos. 7; Fig. 2, Pos. 7) are connected by a bridge (Fig. 1, Pos. 10; Fig. 2, item 10). To the frame (Fig. 1, Pos. 1; Fig. 2, Pos. 1), a guide plate is attached (Fig. 1, Pos. 11; Fig. 2, Pos. 11) with a protractor (Fig. 1, Pos. 12 ) On the guide plate (figure 1, position 11; figure 2, position 11) marked landmark (figure 1, position 15). On the protractor (figure 1, item 12) plotted reference (figure 1, item 13) and landmark (figure 1, item 14). On the protractor (figure 1, item 12) movably fixed arrow (figure 1, item 16). The dynamometer (Fig. 1, Pos. 7; Fig. 2, Pos. 7) is connected to the bridge (Fig. 1, Pos. 10; Fig. 2, Pos. 10) by means of a retractable element (Fig. 2, Pos. 17) .

This device differs from the known constructions intended for measuring muscle strength in that it contains a frame, a handle, a slider with an emphasis, a dynamometer, a bridge, a guide plate, a protractor and an arrow.

The aim of the invention is to measure the muscle strength of the flexors and extensors of the foot and lower leg.

An example of practical application: A device for measuring the strength of the muscles of the extensors and flexors of the lower limb is used as follows: Holding the device by the handle (Fig. 1, pos. 2), put the stop (Fig. 1, pos. 6) of the slider (Fig. 1, pos. .5; Fig. 2, pos. 5) to the front or back surface of the studied segment bent at an angle of 90 °. In this case, make sure that the arrow (figure 1, item 16) was in relation to the studied segment at an angle of 90 °. The correctness of the selected position is confirmed by the relative position of the arrow (Fig. 1, pos. 16) and the landmark (Fig. 1, pos. 13), the landmark (Fig. 1, pos. 14) and the landmark (Fig. 1, pos. 15). The patient is asked to bend (unbend) the limb. In this case, the segment pressure is transmitted to the stop (Fig. 1, pos. 6), the slider (Fig. 1, pos. 5; Fig. 2, pos. 5) moves together with the bridge (Fig. 1, pos. 10; Fig. 2 , position 10), a retractable element (figure 2, position 17) and a slider (figure 1, position 9; figure 2, position 9) of the dynamometer (figure 1, position 7; figure 2, item 7). The position of the slider (figure 1, position 9; figure 2, position 9) on the scale (figure 1, position 8; figure 2, position 8) indicates the strength of muscle groups (flexors / extensors), in kgf

The technical result of the invention is the measurement of muscle strength of the flexors and extensors of the foot and lower leg. The device allows you to determine the strength of the contraction of the muscles of the flexors and extensors at the time of flexion and extension of the lower leg and foot:

- muscle strength is evaluated not on the basis of the subjective sensations of the researcher, but on the basis of indicators of a calibrated mechanical device;

- allows you to measure the strength of the muscles of the flexors and extensors of both the lower leg and foot;

- It is mobile, one-piece, easy to use.

Claims (1)

A device for measuring the strength of the muscles of the extensors and flexors of the lower extremity, comprising a frame and a dynamometer, characterized in that a handle, brackets through which a slider with a stop, a dynamometer with a scale and a slider, and a guide plate with a protractor are fastened are fixed to the frame a movable arrow is fixed to the protractor and landmarks are plotted, a landmark is also plotted on the guide plate, and the slider is movable with a bridge, a retractable element and a dynamometer slider, which one with the previously indicated bridge by means of the specified retractable element.

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