Abstract:
This invention provides a sensor or its related art to be easily used for measuring motor function of living body. This invention relates to a sensor for measuring motor function, which includes a magnetic field generator attached to one of two predetermined positions in a living body changing mutual distance caused by an action of the living body to have a coil board generating a magnetic field by electrification, and a magnetic field detector attached to the other of the two predetermined positions in the living body to detect the magnetic field generated by the magnetic field generator and have the coil board generating an electric current having a magnitude corresponding to a strength of the magnetic field as detected. Furthermore, each of the magnetic field generator and the magnetic field detector is provided with plastics covering a whole coil board thereof.

Description:
FIELD OF THE INVENTION 
       [0001]    The present invention relates to a sensor for measuring motor function concerning living body (for example, human body), a plastic band for attaching the sensor to the living body, and a device for measuring motor function receiving a signal from the sensor. 
       BACKGROUND OF THE INVENTION 
       [0002]    A patient suffering from Parkinson&#39;s disease or cerebral infraction is likely to happen a physical dysfunction. 
         [0003]    Then, it has been long desired that the motor function of the patient can be exactly understood or recognized. Conventionally, a doctor has judged based on an experience, for example, by seeing that a patient practices an opening or closing action between his or her thumb and other finger, in case that the doctor judges the patient to be a good motor function or not. Then, the doctor used to judge a health condition of patient based on the experience by seeing his or her action. However, the motor function cannot be exactly judged based on such a subjective judgment. 
         [0004]    Therefore, this applicant provides an art for measuring motor function of a subject for experiment at high accuracy by that the subject for experiment practices the opening or closing action of their fingers with coils wearing in each of the thumb and forefinger of the subject for experiment such as the patients, such that it is turned on electricity in one coil to generate a magnetic field and velocity, acceleration, or the like caused by the opening or closing action of fingers are analyzed according to a magnitude of induced electric current generated in the other coil. (Japanese patent unexamined laid-open publication No. 246,126 of 2008 will be referred to) 
       SUMMARY OF INVENTION 
       [0005]    However, in the art disclosed in the above publication, it is not satisfied with factors such as a feeling of wearing or costs when the sensor is attached to fingers of subject for experiment, or conveniences (user-friendliness) when the sensor is stored in a device connecting thereto. 
         [0006]    Accordingly, an object of the present invention is to be made in view of the above problem and to provide a sensor and its related art to be easily used for measuring motor function of a living body. 
         [0007]    To solve the above problem, the present invention is characterized by a sensor for measuring motor function including a magnetic field generator attached to one of two predetermined positions in a living body changing mutual distance caused by an action of the living body to have a coil board generating a magnetic field by electrification, and a magnetic field detector attached to the other of the two predetermined positions in the living body to detect the magnetic field generated by the magnetic field generator and have the coil board generating an electric current having a magnitude corresponding to a strength of the magnetic field as detected. Furthermore, this sensor is characterized in that each of the magnetic field generator and the magnetic field detector is provided with plastics covering a whole coil board. The other matters will be later described. According to the present invention, a sensor or the related art to be easily used for measuring motor function in a living body can be provided. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0008]      FIG. 1  is a block diagram of a sensor, a device for measuring motor function, and an analyzer relating to this embodiment. 
           [0009]      FIG. 2A  is a view showing an outer configuration of sensors, cables, and connectors relating to this embodiment,  FIG. 2B  is a view showing a constitution of the sensor, 
           [0010]      FIG. 2C  is a view as the sensor seen from a direction A of  FIG. 2B , and  FIG. 2D  is a view showing a reverse side of a coil board. 
           [0011]      FIG. 3A  is a view seeing an outer appearance of a silicone rubber band of this embodiment,  FIG. 3B  is a view showing an appearance just before the sensor is attached to a finger with the silicone rubber band, and  FIG. 3C  is a view showing an appearance as the sensor attached to the finger with the silicone rubber band. 
           [0012]      FIG. 4  is a view showing an appearance as the sensors attached respectively to a thumb and a forefinger. 
           [0013]      FIG. 5A  is a view showing an outer appearance of the other example of the silicone rubber band, and  FIGS. 5B to 5D  are views respectively showing appearances as the silicone rubber bands attached to fingers in a time series. 
           [0014]      FIG. 6A to 6D  are views showing appearances as the silicone rubber bands in the other example attached to fingers in a time series in sequence of  FIG. 5D . 
           [0015]      FIG. 7A  is a view showing an appearance of the device for measuring motor function relating to this embodiment, and  FIG. 7B  is a view showing an appearance as the sensor connected through the cable and the connector to the device for measuring motor function. 
           [0016]      FIG. 8A  is a view showing the device for measuring motor function with its panel being open of the present invention, and  FIG. 8B  is a view showing an appearance as the device for measuring motor function disposed in a lateral direction. 
       
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
       [0017]    A mode for carrying out this invention (hereinafter, referred to as “embodiment”) will be described with reference to the above drawings. Although a subject for experiment means a living body (human, animal, etc.) as a subject for measuring motor function, it means human in this description. A system S for measuring motor function relating to this embodiment is indicated to make a finger-tapping movement to open or close human thumb and forefinger as soon as possible to a subject for experiment and measure the motor function of the subject for experiment in accordance with this movement of fingers. 
         [0018]    As shown in  FIG. 1 , a system for measuring motor function S is constituted by a sensor  1   a  (magnetic field detector),  1   b  (magnetic field generator) (it is, hereinafter, referred to as “sensor  1 ” except that a distinction between the sensors  1   a ,  1   b  exists), a device for measuring motor function  2 , and an analyzer  3 . As a sensor for measuring motor function is constituted by the magnetic field detector and the magnetic field generator, the magnetic field detector is called by the sensor  1   a , and the magnetic field generator is called by the sensor  1   b , for convenience of explanation, in this embodiment. The sensor  1   a ,  1   b  are worn in two fingers (for example, thumb and forefinger) of subject for experiment. The sensor  1  is connected to a cable  4 , and the cable  4  is connected to a connector  5 . A constitution of the sensor  1  will be later described. 
         [0019]    The device for measuring motor function  2  is a device positioned between the sensor  1  and the analyzer  3 . This device  2  is provided with an AC generator  201 , a current detector  202 , and A (analog)/D (Digital) converter  203  to be materialized by various kinds of electronic circuits. 
         [0020]    The AC generator  201  is designed to generate alternative current with predetermined cycle. 
         [0021]    The current detector  202  is designed to detect electric current from the sensor  1  received through the cable  4  and the connector  5 . 
         [0022]    The A/D converter  203  is designed to convert a value of electric current detected by the current detector  202  to a digital signal, and output the digital signal to the analyzer  3 . A constitution of the device for measuring motor function  2  will be later described. 
         [0023]    An outline of actions of the sensor  1 , the device for measuring motor function  2 , and the analyzer  3  will be hereinafter described. The subject for experiment is supposed to wear the sensor  1   a ,  1   b  in two fingers to make the finger-tapping movement. 
         [0024]    At first, the AC generator  201  of the device for measuring motor function  2  generates alternative current having a specific frequency (for example, 20 kHz etc.). The alternative current is supplied through the connector  5  and the cable  4  to the sensor  1   b . The sensor  1   b  receiving alternative current generates a magnetic field and the magnetic field changes constantly. The sensor  1   a  generates an induced current by an electromagnetic induction caused by a change of magnetic field. In addition, a magnitude of the induced current becomes smaller, as a distance between the sensors  1   a ,  1   b  becomes larger. 
         [0025]    The current detector  202  is designed to detect an induced current generated by the sensor  1   a  through the cable  4  and the connector  5  to supply the data to the A/D converter  203 . The A/D converter  203  converts a waveform data of the data (analogue signals of the induced current) received from the current detector  202  to a waveform data of the digital signal at the predetermined sampling frequency to send the converted digital signal to the analyzer  3 . The analyzer  3  is a computer device and analyzes motor function of a subject for experiment in accordance with the basis of digital signal received from the A/D converter  203 . 
         [0026]    The device for measuring motor function  2  may be appropriately provided with an amplifier circuit, a phase adjustment circuit, LPF (Low-Pass Filter), and the like, besides the above constitution. An explanation about the circuits and the like will be omitted with reference to the above publication as described in detail. 
         [0027]    Next, the sensor  1  and a constitution of the plastic band for attaching the sensor  1  to fingers of a subject for experiment will be described. As shown in  FIG. 2A , the sensor  1  is connected to the cable  4 , and the cable  4  is connected to the connector  5 . 
         [0028]    As shown in  FIG. 2B , the sensor  1  is constituted by covering a coil board  11  having a coil portion  12  by a plastics  101  including a pin  102  and a nail contact portion  103 . The sensor  1  can make high in strength by covering the whole coil board  11  by the plastics  101 , and corrosions and damages of the coil board  11  can be preferably prevented. The coil board  11  is functioned as a means of magnetic field generation or a means of magnetic field detection. For example, it is materialized by piling multi-layer coil portion  12  on glass epoxy board or the like. The coil board is supposed to refer to the above publication as described in detail, and an explanation thereof will not be further described. 
         [0029]    A pin  102  is constituted to provide a ball-like protrusion on a base like a form of thin disc to form a part of plastics  101 . The pin  102  is a means for securing a silicone rubber band  111  (plastic band, or band made of silicone),  121  (plastic band), as described later, to the sensor  1 . The detail thereof will be later described. 
         [0030]    The nail contact portion  103  is a portion being in contact with a finger nail when the sensor  1  is attached to the finger of subject for experiment in a part of the plastics  101  to have a curve directed along a form of the finger. The subject for experiment can have a comfortable feeling of wearing when the sensor  1  is attached to the finger by the nail contact portion  103  having this curve. As the nail contact portion  103  is made of relatively soft plastics, the subject for experiment can have a comfortable feeling of wearing and reduce a possibility damaging nail or skin. 
         [0031]      FIG. 2D  is a view showing a reverse side of the coil board  11 . In a reverse side of the coil board  11 , a conducting wire  16  of the coil portion  12  is adhered by soldering at a solder joint portion  14 . The conducting wire  16  is connected to the cable  4 . The cable  4  is let off from a reverse side of the coil board  11  through a hole  13  to a front side of the coil board  11 . A connection between the conducting wire  16  and the cable  4  is adhered by an adhesion portion  15  to the coil board  11 . 
         [0032]    In such a way, a tensile strength of the conducting wire  16  is remarkably increased by letting out the cable  4  from a reverse side of the coil board  11  through the hole  13  to the surface side and adhering the connection between the conducting wire  16  and the cable  4  to the coil board  11  at the adhesion portion  15 . In case that the cable  4  is pulled, a whole force thereof does not travel directly, and the conducting wire or the like can be prevented from cutting itself. The load applied to the solder joint portion  14  can be remarkably decreased and a fitting of the conducting wire  16  can be confirmed for sure. As shown in  FIG. 3A , a silicone rubber band  111  as one example of the plastic band is thin in thickness, and the whole body is formed like a substantially crescent swelling in the middle seeing from top (in case of a direction perpendicular to the thickness). The silicone rubber band  111  has two holes  112  and sixteen holes  113 . 
         [0033]    As shown in  FIG. 3B , when the sensor  1  is attached to a finger  6 , the pin  102  is designed to pass through one of holes  112  of the silicone rubber band  111  of the sensor  1 , and a swelling side of the silicone rubber band  111  is set to be placed in the base side. Thereafter, as shown in  FIG. 3C , the silicone rubber band  111  is wound around the finger  6  to pass the pin  102  in one of the holes  113  in a slightly tensile condition. Then, in case where the sensor  1  is attached to the finger  6 , the silicone rubber band  111  can be uniformly in contact with the whole finger  6  and a stable feeling of wearing can be obtained. 
         [0034]    As shown in  FIG. 4 , the sensor  1   a  can be attached by the silicone rubber band  111  to a finger (forefinger)  6   a  and the sensor  1   b  can be attached by the silicone rubber band  111  to a finger (thumb)  6   b . In this case, when the cable  4  is adhered by a cable clip  41  to clothes  42 , an accident, as the sensor pulled by the cable  4 , can be effectively avoided, then the stability for attaching the sensor  1  to the finger  6  can be remarkably improved. The subject for experiment makes the finger-tapping movement in a condition shown in  FIG. 4 . 
         [0035]    Next, the other example of the silicone rubber band will be described. As shown in  FIG. 5A , a silicone rubber band  121  giving the other example of the silicone rubber band comprises a sensor cover  122  wound around the sensor  1  and a finger holder  123  having a substantially crescent form (a part thereof and the sensor cover  122  are mutually overlapped, a portion forming a substantially crescent) wound around the finger  6 . The sensor cover  122  and the finger holder  123  are integrally constituted to be like a substantially letter “L”. 
         [0036]    The sensor cover  122  is provided with a hole  124 , a slit  125 , and a hole  126 . The finger holder  123  is provided with sixteen holes  127  besides the hole  126 . 
         [0037]    Next, the steps to attach the sensor  1  to the finger  6  with the silicone rubber band  121  will be described. 
         [0038]    At first, as sequentially shown in  FIG. 5B to 5D , the sensor  1  is passed through the slit  125  of the silicone rubber band  121 . 
         [0039]    Next, as shown in  FIG. 6A , the pin  102  of the sensor  1  is passed through the hole  124  of the silicone rubber band  121 . Next, as shown in  FIGS. 6B and 6C  in sequence, the pin  102  of the sensor  1  is passed through the hole  126  of the silicone rubber band  121 . Then, as shown in  FIG. 6D , the silicone rubber band  121  is wound around the finger  6  to pass the pin  102  through one of the holes  127  in a slightly tensile condition. 
         [0040]    In such a way, when the sensor  1  is attached to be wound around the finger  6  with the silicone rubber band  121 , as the finger holder  123  of the silicone rubber band  121  is in a uniform contact with the whole finger  6  by that the finger holder  123  of the silicone rubber band  121  forms like a substantially crescent, a stable feeling of wearing can be obtained as well as the case of the silicone rubber band  111 . 
         [0041]    As the silicone rubber band  121  is integrally constituted by the sensor cover  122  and the finger holder  123 , it makes no possibility for attaching to the finger  6  with the finger holder  123  turned upside down in a swelling direction of substantially crescent form thereof. 
         [0042]    When the silicone rubber band  121  is attached to the finger  6  with the finger holder  123  turned upside down in a swelling direction of substantially crescent form thereof, the finger holder  123  is not in uniform contact with whole finger  6 . Then, as a feeling of discomfort as a part of the finger  6  pressed occurs, a subject for experiment can notice or understand a mistaken way of wearing. 
         [0043]    As the sensor  1  is covered by the sensor cover  122 , the sensor  1  is not in direct contact with the finger  6 . Accordingly, in case where the sensor  1  is made of materials possible to cause an allergic reaction, a possibility for causing an allergic reaction can be greatly decreased for a subject for experiment. It is mild or gentle to be in contact with the finger  6 , as it is made of silicone to be softer than the plastics  101  of the sensor  1 . Furthermore, the friction caused by being in contact with the finger  6  becomes large and it can be effectively prevented from occurring a slide between the sensor  1  and the finger  6  (nail). 
         [0044]    In case of breaking the silicone rubber band  121  or in case of cleaning or washing, the silicone rubber band  121  and the sensor  1  can be easily separated. 
         [0045]    The slit  125  is provided in a position and a magnitude as shown in  FIG. 5A . When the silicone rubber band  121  is wound around the sensor  1 , the both can be mutually in close contact, and the stability for attaching the sensor  1  to the finger  6  can be improved. 
         [0046]    Next, a constitution of the device for measuring motor function  2  will be described. As shown in  FIGS. 7A and 7B , the device for measuring motor function  2  is constituted by a main body portion  21 , a grip  22 , a panel  23  (door), and a base  24 . 
         [0047]    The main body portion  21  is formed like a substantially parallelepiped shape to house an AC generator  201  (Referring to  FIG. 1 ), a current detector  202  (Referring to  FIG. 1 ), and an A/D converter  203  (Referring to  FIG. 1 ) therein. The main body portion  21  is provided with an Input/Output terminal  211  used for connecting to the analyzer  3  with cables, and power source switch  25  for switching On-or-Off of the device for measuring motor function  2 . 
         [0048]    The grip  22  is attached to the main body portion  21  and is positioned to be upper in a vertical direction of center of gravity of the device for measuring motor function  2  when it is supported by the base  24 . As the grip  22  is provided in such a position, the device for measuring motor function  2  does not tilt at the time of lifting the device for measuring motor function  2  with the grip  22  held. Then, it is convenient for transporting or the like. As a space under the grip  22  as shown in Figures can be maintained to be large, a person carrying the device for measuring motor function  2  is easy to hold the grip  22 . 
         [0049]    The panel  23  is openably or closably attached by a hinge to the main body portion  21 . The width w formed between the panel  23  and the main body portion  21  is constituted not to pinch user&#39;s finger in this gap, that is, to be around 20 mm in this description. 
         [0050]    The base  24  is designed to be a member supporting the main body portion  21  and has a space for containing the main body portion  21  and the panel  23  seeing from top (in case of a direction seeing from the grip  22 ). 
         [0051]    As shown in  FIG. 8A , the main body portion  21  is provided with a storage section  26  and a lamp  27  at a portion to be seen at the time of opening the panel  23 . 
         [0052]    The storage section  26  is used for winding the cable  4  connected to the sensor  1  in an outer circumference. For example, it is made of sponge member. The storage section  26  is provided with a storage section of replacement silicone rubber band  261 , storage section of calibration block  262 , hooks  263 ,  264 , and a magnet for holding panel  265 . 
         [0053]    The storage section of replacement silicone rubber band  261  is a space for housing the silicone rubber band  111 ,  121 . Then, the silicone rubber band  111 ,  121  may be housed in a bag. 
         [0054]    The storage section of calibration block  262  is a space for housing the calibration block  7 . The calibration block  7  is an equipment used for calibration in relationship between the voltage data and the distance between fingers. As each of subjects for experiment has a difference in magnitude of fingers or the like, the subject for experiment grasps the calibration block  7  with his or her thumb and forefinger and calibrates by understanding a relationship between voltage data and distance between fingers. In addition, the calibration using the calibration block  7  will be referred to the above publication as described in detail, and a further explanation thereof will be omitted. 
         [0055]    The hooks  263 ,  264  are members for preventing the cable  4  wound around an outer circumference of the storage section  26  from protruding outside. 
         [0056]    Accordingly, various problems such as a case where the panel  23  cannot be closed by an intervention between the storage section  26 , as the cable  4  wound around an outer circumference of the storage section  26  and protruded outside, and the panel  23 , when the panel  23  is closed, or a case where the cable  4 , as protruded as the above, damages, can be effectively prevented before anything happens. 
         [0057]    The magnet for holding the panel  265  is designed to magnetically attract a metal portion  231  provided in the panel  23 . Then, the panel  23  as closed is attached to the main body portion  21  in stability. The magnet for holding the panel  265  also plays a role to prevent the cable  4  wound around an outer circumference of the storage section  26  from protruding outside as well as the hooks  263 ,  264 . 
         [0058]    As above mentioned, according to the device for measuring motor function  2 , the sensor  1  not in use and the cable  4  can be housed in compact by winding them around the storage section  26 , it is easy to carry the device for measuring motor function  2 , and the sensor  1  and the cable  4  can be protected from the outside situation. 
         [0059]    As the storage section  26  is constituted by the sponge member, the possibility for damaging the cable wound around the storage section  26  or the sensor  1  can be decreased. 
         [0060]    As the storage section of replacement silicone rubber band  261  housing the silicone rubber bands  111 ,  121  and the storage section of calibration block  262  housing the calibration block  7  are provided inside the storage section  26  for winding the sensor  1  and the cable  4 , the space thereof can be effectively used. 
         [0061]    The base  24  is large enough to contain the main body portion  21  and the panel  23  as seen from top. Then, as shown in  FIG. 8B , the device for measuring motor function  2  is constituted to unnaturally have an oblique angle, when the device for measuring motor function  2  is placed in a lateral direction. Thus, as the user comes to feel a sense of discomfort at the time of opening or closing the panel  23 , and winding the cable  4  around the storage section  26 , or the like, it makes a user to promote a use as placed in a longitudinal direction of the device for measuring motor function  2 . 
         [0062]    As an embodiment of the present invention has been described, the present invention is not limited to the above, but can be done within a range not to change gist or essence thereof. For example, a finger for attaching the sensor  1  is not limited to a thumb or a forefinger, but may be the other finger such as a middle finger. 
         [0063]    The material of plastic band may not be made of silicone, but material other than silicone can be used if it is more excellent or substantially the same in quality of the property such as elasticity, softness, strength, durability, waterproof, biological safety, and temperature characteristics (the elasticity or the like is inconstant in case of varying in temperature). In a specific constitution, it may be appropriately changed without departing from a gist of the present invention.