Abstract:
A blood glucose meter includes a front attachment part to which a test piece is attached, a measurement part for measuring a component of blood collected via a blood guide passage in the test piece, and a monitor for displaying the measurement results obtained by the measurement part. When the device is placed on a horizontal plane by referring to the display face of the monitor as the upper side and the opposite side as the lower side and placing the display face of the monitor upward, the central axis of the test piece extends obliquely downward toward the front side. The blood glucose meter comprises a main part provided with the monitor and a linking part between the main part and the front attachment part. The top face of the linking part is placed roughly parallel to the central axis line and is provided with an ejector lever.

Description:
TECHNICAL FIELD 
       [0001]    This invention relates to a blood component measuring apparatus (device) for measuring a component such as glucose from blood sampled through a blood introduction path in a test piece, which is mounted on a distal end mounting portion of the blood component measuring apparatus. 
       BACKGROUND ART 
       [0002]    Daily management by measurement of variations in blood glucose levels is recommended to diabetics. A blood glucose meter has been placed into practical use, in which a measurement portion, such as a test paper impregnated with a reagent that develops a color in response to the amount of glucose in blood, is provided. Blood is applied to the test paper so that the test paper develops a color, and the degree of the color is measured optically and calculated in order to display the blood glucose level (for example, refer to Japanese Utility Model Registration No. 3135393 (FIGS. 2 and 8), Japanese Laid-Open Patent Publication No. 2000-046834, and U.S. Pat. No. 7,077,328). The test paper is provided on a disposable test piece, and the test piece is mounted on a distal end mounting portion of the blood glucose meter. Further, a blood glucose meter in which an electric chemical sensor is used has also been placed into practical use. 
         [0003]    When blood of a diabetic is to be sampled, the skin (for example, a finger, a palm, or the like) is punctured first by a predetermined puncture device, and blood is debouched by a small amount after the puncture. Then, a test piece is mounted on the blood glucose meter and a spotted portion at the distal end of the test piece is brought into contact with a blood drop, whereby the blood is introduced to the test paper by capillary action through a communication path having a very small diameter. 
         [0004]    On the other hand, blood glucose meters in recent years are demanded not only for personal use, in which a diabetic uses the blood glucose meter to measure the blood glucose levels daily, but also for hospital use, in which a health care worker carries out measurement with regard to plural patients who are hospitalized in medical facilities. 
         [0005]    Incidentally, many diabetics are elderly and sometimes use of fingers or hands in such diabetics is made troublesome due to complications from diabetes. Further, even if able to freely use the fingers or hands, some patients may not be able to handle a blood glucose meter well due to shaking of the fingertips due to psychological factors or the like, if the patient is unaccustomed to operation of the blood glucose meter. In particular, since a blood drop obtained by puncturing is very small, it is not always easy for a diabetic to place the spotted portion of the test piece into contact with the blood drop. Further, if the procedure described above is carried out with trembling hands, sufficient blood may not be impregnated into the test paper, even if the spotted portion comes into contact with the blood drop. In such a case, since a correct measurement result of the blood glucose level is not obtained, puncturing must be carried out again to attempt measurement after the test piece has been exchanged. 
         [0006]    According to research carried out by the inventor of the present application, it has been found that there are many patients whose hands are unstable if both arms are left in a free state in the air, thus making it difficult to bring the spotted portion into contact with the blood drop. However, the hands can be stabilized if the patient&#39;s wrist or peripheral portions of the wrist are placed on a table. 
         [0007]    However, many patients have been found who fail, if their wrists are placed on a table, to suitably set the direction of the blood glucose meter, due to the fact that the degree of freedom in operation of the wrists is suppressed, and ultimately it is difficult to bring the spotted portion into contact with the blood drop. In particular, as seen in  FIG. 21 , while a blood drop  900  obtained by puncture is positioned in a substantially upward direction on one of the hands (hereinafter referred to as the left hand) so that the blood drop  900  cannot fall off, a blood glucose meter  901  and a test piece  902 , which are grasped by the right hand, are directed obliquely upwardly (refer to the arrow in  FIG. 21 ), and therefore it is difficult to bring the spotted portion  903  at the distal end into contact with the blood drop  900 . 
         [0008]    Further, as seen in  FIG. 22 , where a spotting operation is carried out in midair, if the blood drop  900  is directed substantially upward, then the blood glucose meter  901  approaches the blood drop  900  from an upward or obliquely upward location. Therefore, the blood drop  900  or the spotted portion  903  of the test piece  902  is placed in a blind spot by the blood glucose meter  901  and the right hand. Such a situation impairs visibility and sometimes makes it less easy to carry out the spotting operation. Since the spotted portion of the test piece is an operation carried out upon measurement of blood glucose levels, good visibility upon operation is demanded. Also, even when the blood glucose meter is placed on a table, visibility still is demanded to enable confirmation of the state of operation. 
         [0009]    Further, even with a health care worker who is skilled in operating the blood glucose meter, to bring the spotted portion into contact with the very small blood drop requires attentiveness. In particular, where measurements are carried out for a great number of patients, it is desirable to carry out the measurement process for all individuals as easily and conveniently as possible, and thus it is desirable to secure visibility of the spotted portion. 
         [0010]    Further, it is desirable to prevent application of unnecessary external forces to the test piece that is mounted on the blood glucose meter when the blood glucose meter is placed on a table. 
         [0011]    Further, when the blood glucose meter is placed on a table, it is desirable for the test piece to be spotted on the blood after the spotted portion has been positioned in advance with respect to proximity of the blood drop. 
         [0012]    Further, since multiple patients and a plurality of health care workers (nurses, doctors, and so forth) exist within medical facilities, in a case where the blood glucose meter is intended for hospital use, specifications different from those for personal use are required. 
         [0013]    In particular, while some blood glucose meters have a function for storing measurement values of blood glucose levels carried out a plural number of times, since it is supposed that one blood glucose meter is used for measurement of blood glucose levels of multiple patients in a medical facility, there is the necessity to store measured blood glucose levels in a state in which the blood glucose levels are distinguishable for individual patients. Further, for recording and traceability, it is desirable to make it possible to specify an operator who carries out measurement of blood glucose levels at each time of measurement. In order to specify a patient and an operator in the foregoing manner, it is necessary to read identification information of the patient and the operator into the blood glucose meter. 
         [0014]    Furthermore, it is desirable for acquisition of such identification information to be carried out quickly and stably without causing discomfort to the patient. 
         [0015]    On the other hand, the blood glucose meter disclosed in U.S. Pat. No. 7,077,328 described above also has several problems. 
         [0016]    First, since a barcode reader is provided at the distal end, there is a possibility that a laser beam emitted upon scanning may be directed toward the patient and cause the patient to experience discomfort. 
         [0017]    Secondly, since the barcode reader and a distal end measurement portion are disposed very near to each other, there is a possibility that a test piece, which is mounted on the distal end measurement portion, may hit against some different body (including a living body) upon reading of the barcode. If such a hit occurs before measurement of the blood glucose level is taken, then there is a possibility that the spotted portion of the test piece may become soiled or broken, resulting in a measurement failure. Further, if such a hit occurs after measurement of the blood glucose level, since blood sticks onto the spotted portion, a different body with which the spotted portion comes into contact may become soiled. 
         [0018]    Thirdly, since a monitor is disposed in proximity to the distal end measuring portion, the distal end portion has a considerable size, which impedes balance. Further, since a gripping portion is positioned rearwardly with respect to the monitor, the gripping portion is positioned far from the distal end measuring portion. As a result, the distal end measuring portion is likely to become unstable. 
       SUMMARY OF INVENTION 
       [0019]    The present invention has been made taking the above matters into consideration. A first object of the present invention is to provide a blood component measuring apparatus, which allows a spotted portion of a test piece to be brought into contact readily and with certainty with a blood drop obtained by puncture, thereby to suppress errors in measurement. A second object of the present invention is to provide a blood component measuring apparatus, which can carry out reading of data simply, conveniently, quickly and stably. 
         [0020]    According to the present invention, a blood component measuring apparatus is provided on which a test piece is mounted, including a distal end mounting portion on which the test piece is capable of being mounted, a measuring portion adapted to measure components of blood sampled through a blood introduction path provided in the test piece that is mounted on the distal end mounting portion, and a monitor adapted to display a result determined by the measuring portion and a predetermined control section, wherein a display face of the monitor is defined as an upper side, while an opposite face to the display face is defined as a lower side, and wherein, when the blood component measuring apparatus is placed on a horizontal plane in a state in which the display face of the monitor is directed upwardly, a center axial line of the test piece is directed obliquely downward toward the distal end side. 
         [0021]    By shaping the blood component measuring apparatus in this manner, such that, when the blood component measuring apparatus is placed on a horizontal plane, the center axial line of the test piece is directed obliquely downward toward the distal end side, it becomes easy to orient the spotted portion of the test piece in a direction toward the blood drop. Consequently, the spotted portion of the test piece can be brought into contact readily and reliably with a blood drop obtained by puncture, whereby measurement errors can be suppressed. 
         [0022]    Further, according to another aspect of the present invention, a blood component measuring apparatus according to the present invention is provided on which a test piece is mounted, including a distal end mounting portion on which the test piece is capable of being mounted, a measuring portion adapted to measure components of blood sampled through a blood introduction path provided in the test piece that is mounted on the distal end mounting portion, and a monitor adapted to display a result determined by the measuring portion and a predetermined control section, wherein a display face of the monitor is defined as an upper side, while an opposite face to the display face is defined as a lower side, and wherein a center axial line of the test piece is directed, as viewed in side elevation, obliquely downward toward the distal end side with reference to a line of extension of the display face of the monitor. 
         [0023]    By shaping the blood component measuring apparatus in this manner, such that the center axial line of the test piece is directed obliquely downward toward the distal end side with reference to the line of extension of the display face of the monitor, it becomes easy to direct the spotted portion of the test piece in a direction toward the blood drop. Consequently, the spotted portion of the test piece can be brought into contact readily and reliably with a blood drop obtained by puncture, whereby measurement errors can be suppressed. 
         [0024]    An angle defined by the line of extension and the center axial line may be 10° to 40°. According to such an angle setting, the spotted portion of the test piece is oriented more correctly in a direction toward the blood drop. 
         [0025]    The blood component measuring apparatus may further include a main portion on which the monitor is provided, and an intermediate portion provided between the main portion and the distal end mounting portion, wherein an upper face of the intermediate portion is set substantially parallel to the center axial line. On such an intermediate portion, a space in which several mechanisms relating to the distal end mounting portion can be provided is assured in a preferred direction. Further, since the intermediate portion is provided, it is easy to direct the center axial line of the test piece obliquely downward toward the distal end side. Moreover, by setting the upper face of the intermediate portion substantially parallel to the center axial line of the test piece, it is easy to visually grasp the direction of the test piece. 
         [0026]    An ejector lever for removing the mounted test piece by performing a push out operation toward the distal end side may be provided on the upper face of the intermediate portion. By this configuration, the ejector lever moves along the upper face and can be operated readily. Further, a space for movement of the ejector lever can be assured. 
         [0027]    As viewed from above, the intermediate portion may have a width that decreases continuously and concavely from the main portion toward the distal end side. By this configuration, the intermediate portion is made suitably thin and further has a concave shape. Consequently, the intermediate portion can be grasped readily by the fingers. Further, since the intermediate portion is positioned near to the distal end mounting portion, by grasping the intermediate portion, the test piece that is mounted thereon can be stabilized. 
         [0028]    A thickness of the main portion in a vertical direction may be substantially fixed, and as viewed in side elevation, the main portion and the intermediate portion may be connected to each other by a continuously curved face portion, the lower face of which has a concave shape. It is easy to place a finger on such a concave and continuous curved face, and thus it is easy to grasp the blood component measuring apparatus. 
         [0029]    The blood component measuring apparatus may be configured such that, when the test piece is mounted on the distal end mounting portion and the blood component measuring apparatus is placed on the horizontal plane, in a state in which the display face of the monitor is directed upwardly, a distance between a spotted portion at the distal end of the test piece and the horizontal plane is 3 mm to 30 mm. By this configuration, it is possible to place a finger or a hand, on which a blood drop has been formed, on a table, and in a state in which the finger or hand remains placed on the table, the blood glucose meter can be moved toward the blood drop to perform blood spotting. Therefore, even a patient whose fingers are impaired can readily perform blood glucose measurement. Further, when the blood component measuring apparatus is left placed on the table, visibility of the spotted portion is good and the state of the spotted portion can be confirmed. 
         [0030]    When the blood component measuring apparatus is placed on the horizontal plane in a state in which the display face of the monitor is directed upwardly, the distance between a highest point of the lower face and the horizontal plane may be 3 mm to 20 mm. By this configuration, when the blood component measuring apparatus is placed on a table, a suitable gap is assured for enabling placement of the fingers. 
         [0031]    When the test piece is mounted on the distal end mounting portion and the blood component measuring apparatus is placed on the horizontal plane in a state in which the display face of the monitor is directed upwardly, the test piece may be spaced away from the horizontal plane. By this configuration, unnecessary external forces are prevented from being applied to the test piece. 
         [0032]    The blood component measuring apparatus according to the present invention is shaped such that, when the blood component measuring apparatus is placed on a horizontal plane, the center axial line of the test piece is directed obliquely downward toward the distal end side. (In other words, the blood component measuring apparatus is shaped such that the center axial line is directed obliquely downward toward the distal end side, with reference to a line of extension of the display face of the monitor.) Consequently, it is easy to direct the spotting portion of the test piece in a direction toward the blood drop, and it is possible to place the spotted portion of the test piece into contact with the blood drop, which is obtained by puncture, readily and reliably. Thus, measurement errors can be suppressed. 
         [0033]    According to another aspect of the present invention, a blood component measuring apparatus is provided on which a test piece is mounted, including a distal end mounting portion on which a test piece is capable of being mounted, a measuring portion adapted to measure components of blood sampled through a blood introduction path provided in the test piece that is mounted on the distal end mounting portion, and a monitor adapted to display a result determined by the measuring portion and a predetermined control section, optical data reading means provided at a rear end, a main portion on which the monitor is provided, an intermediate portion provided between the main portion and the distal end mounting portion, and a curved face portion, which serves as a connection portion between the main portion and the intermediate portion, and the lower face of which has a concave shape as viewed in side elevation. 
         [0034]    Since the optical data reading means is provided at the rear end portion, the optical data reading means is spaced away from the distal end mounting portion and is directed in an opposite direction. Consequently, upon reading of data, the test piece can be prevented from hitting against a different body. Further, the concave curved face portion can be used as a grasping portion, and the concave curved face is positioned near the distal end mounting portion. Therefore, it is easy to adjust the location of the spotted portion of the test piece with respect to the blood drop, and thus a stabilized operation can be achieved. In this manner, with the blood component measuring apparatus according to the present invention, reading of data can be carried out simply, conveniently, quickly and stably. 
         [0035]    An operation switch for the optical data reading means may be provided on a face on which the monitor is disposed between the monitor and the distal end mounting section. 
         [0036]    The location between the monitor and the distal end mounting portion is a position at which it is easy to operate the operation switch, and thus it is preferable to provide the operation switch at such a position. Further, since the operation switch is located at this position, there is no need to change the grasping position of the hand upon measurement of the blood component and upon reading of data, which is efficient. The operation switch is positioned substantially on an opposite side to the curved face portion, and is held by and between a finger (for example, the forefinger), which is placed on the curved face portion, and another finger (for example, the thumb) that presses the operation switch, thereby permitting stabilized grasping and operation. 
         [0037]    The optical data reading means may comprise a barcode reader. 
         [0038]    The optical data reading means may comprise a camera for reading a two-dimensional code. 
         [0039]    As viewed from above, the intermediate portion may have a width that decreases continuously and concavely from the main portion toward the distal end side. By this configuration, the intermediate portion is made suitably thin and has a concave shape. Consequently, the intermediate portion can be grasped readily by the fingers. Further, since the intermediate portion is positioned near to the distal end mounting portion, by grasping the intermediate portion, it is easy to bring the blood drop into contact with the spotted portion of the mounted test piece, so that a stabilized operation can be carried out. 
         [0040]    If the radius of curvature of the curved face portion is 5 mm to 25 mm, then the finger can be placed more readily on the curved face portion. 
         [0041]    A display face of the monitor may be defined as an upper side, while an opposite face to the display face may be defined as a lower side. Further, as viewed in side elevation, a center axial line of the test piece may be directed obliquely downward toward the distal end side with reference to a line of extension of the display face of the monitor. By shaping the blood component measuring apparatus in this manner, such that the center axial line of the test piece is directed obliquely downward toward the distal end side with reference to the line of extension of the display face of the monitor, it becomes easy to orient the spotted portion of the test piece in a direction toward the blood drop. Consequently, the spotted portion of the test piece can be brought into contact readily and reliably with the blood drop obtained by puncture, and measurement errors can be suppressed. 
         [0042]    With the blood component measuring apparatus according to the present invention, simple and convenient data reading can be achieved in a contactless manner. Further, a connector connecting operation, etc., are made unnecessary, and reading of data can be carried out rapidly. 
         [0043]    Since the optical data reading means is provided at the rear end portion, the optical data reading means is oriented in a direction opposite to the test piece and the measuring portion at the distal end, and in a direction opposite from the patient. Consequently, the optical data reading means does not cause the patient to experience any discomfort. 
         [0044]    Since the curved face portion, the lower face of which is concave, is provided at the connecting portion between the main portion and the intermediate portion, a finger can be placed thereon to stabilize the blood component measuring apparatus. Accordingly, optical reading by the optical data reading means can be carried out in a stable manner. 
     
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         [0045]      FIG. 1  is a perspective view of a blood glucose meter according to a present embodiment; 
           [0046]      FIG. 2  is a plan view of the blood glucose meter according to the present embodiment; 
           [0047]      FIG. 3  is a side elevational view of the blood glucose meter according to the present embodiment; 
           [0048]      FIG. 4  is an enlarged perspective view of a rear end portion of the blood glucose meter according to the present embodiment; 
           [0049]      FIG. 5  is a cross sectional view of a test piece; 
           [0050]      FIG. 6  is a side elevational view of the blood glucose meter in a state of being grasped with a finger placed on a curved face portion; 
           [0051]      FIG. 7  is a schematic view of the blood glucose meter in a state in which an intermediate portion thereof is grasped; 
           [0052]      FIG. 8  is a view illustrating a manner in which a health care worker reads measuring person identification data using the blood glucose meter; 
           [0053]      FIG. 9  is a view illustrating a manner in which a health care worker reads patient identification data using the blood glucose meter; 
           [0054]      FIG. 10  is a schematic view at a preceding stage before a spotting operation is carried out with the wrists or neighboring portions of the left and right hands being placed on a table, and while the blood glucose meter is grasped; 
           [0055]      FIG. 11  is a schematic view showing a state in which a spotting operation is carried out with the wrists or neighboring portions of the left and right hands being placed on a table, and while the blood glucose meter is grasped; 
           [0056]      FIG. 12  is a schematic view showing a state in which one finger is placed on a table, and a spotting operation is carried out by the blood glucose meter, which is placed on the table; 
           [0057]      FIG. 13  is a schematic view showing a state in which two fingers are placed on a table, and a spotting operation is carried out by the blood glucose meter, which is placed on the table; 
           [0058]      FIG. 14  is a schematic view showing a state in which a health care worker carries out a spotting operation on a patient; 
           [0059]      FIG. 15  is a schematic view showing a state in which a health care worker carries out a spotting operation on a patient; 
           [0060]      FIG. 16  is a perspective view of a blood glucose meter according to a first modification; 
           [0061]      FIG. 17  is a perspective view of a test piece applied to the blood glucose meter according to the first modification; 
           [0062]      FIG. 18  is a plan view of a blood glucose meter according to a second modification; 
           [0063]      FIG. 19  is a side elevational view of the blood glucose meter according to the second modification; 
           [0064]      FIG. 20  is a perspective view of a blood glucose meter according to a third modification; 
           [0065]      FIG. 21  is a schematic view of a first example in which a spotting operation is carried out by a blood glucose meter according to the conventional art; and 
           [0066]      FIG. 22  is a schematic view of a second example in which a spotting operation is carried out by a blood glucose meter according to the conventional art. 
       
    
    
     DESCRIPTION OF EMBODIMENTS 
       [0067]    In the following descriptions, an embodiment of a blood component measuring instrument according to the present invention will be described with reference to  FIGS. 1 to 20  of the accompanying drawings. 
         [0068]    As shown in  FIGS. 1 ,  2 ,  3  and  4 , the blood glucose meter (blood component measuring instrument)  10   a  according to the present embodiment includes a distal end on which a test piece  12  is mounted. The blood glucose meter  10   a  has a function of storing values obtained by blood glucose measurements carried out a plural number of times. In medical facilities, the single blood glucose meter  10   a  can be used for blood glucose measurements of a plurality of patients. First, the test piece  12  shall be described. 
         [0069]    As shown in  FIG. 5 , the test piece  12  includes a base tube  14 , a flange  16  that covers one end of the base tube  14 , a conical projection  18  projecting from the flange  16 , and a test paper  20 , which is stuck to the rear face of the flange  16 . A plurality of slits  14   a  (refer to  FIG. 1 ) are provided in the base tube  14 . A linear blood introduction path  24 , which extends from a spotted portion  22  at the end of the projection  18  and which communicates with the test paper  20 , is provided at the center of the projection  18 . As materials for the test paper  20 , for example, polyether sulfone can be used. As a reagent, which is impregnated in the test paper  20 , a chromogenic agent such as, for example, glucose oxidase (GOD), peroxidase (POD), 4-aminoantipyrine or N-ethyl-N(2-hydroxy-3-sulfopropyl) can be used. Further, the reagent may contain a predetermined buffering agent. The blood introduction path  24  generally is provided on a center axial line C of the test piece  12 . The center axial line C of the test piece  12  forms a straight line that extends in a direction in which the spotted portion  22  of the test piece  12  is directed, the straight line passing through the distal end of the spotted portion  22 . 
         [0070]    The test piece  12  is a so-called disposable article, and is packaged in an individual package body (not shown) and sterilized in advance. The blood introduction path  24  is set sufficiently small in diameter, to such a degree that the blood introduction path  24  is capable of sucking blood by capillary action, and of introducing the blood, which is brought into contact with the spotted portion  22 , to the test paper  20 . A conventional article can be applied as is to the test piece  12 . 
         [0071]    Referring back to  FIGS. 1 to 4 , the blood glucose meter  10   a  according to the present embodiment includes a distal end mounting portion  30  on which the test piece  12  is mounted, a measuring portion  32  for measuring a developed color of the test paper  20  caused by a blood component that is sampled through the blood introduction path  24  of the test piece  12 , which is mounted on the distal end mounting portion  30 , a liquid crystal monitor  34  for displaying a result of measurement by the measuring portion  32  through a control section (microcomputer, etc.)  33 , an ejector lever  36  for removing the mounted test piece  12  by carrying out a push out operation toward the distal end side, an operation button group  38 , a data reading button  40 , and a cap  39  for protecting the distal end mounting portion  30 . The blood glucose meter  10   a  has a smooth shape, which generally is free of angled portions. In order to avoid complexity in illustration, the cap  39  has been omitted from the figures, except  FIG. 1 . For the measuring portion  32 , various mechanisms can be adopted in accordance with the component detection method of the test piece  12 . 
         [0072]    The blood glucose meter  10   a  is for hospital use, wherein a hospital care worker uses the blood glucose meter  10   a  to carry out measurements with regard to plural patients who are hospitalized in a hospital facility. The blood glucose meter  10   a  includes data recording and calling functions for each patient along with buttons for such functions. The blood glucose meter  10   a  has a size that is somewhat greater than that of a blood glucose meter  10   c  for personal use (refer to  FIG. 18 ), which shall be described later. Naturally, the blood glucose meter  10   a  can also be used as is, as an apparatus for personal use, without applying special remodeling to the blood glucose meter  10   a.    
         [0073]    The distal end mounting portion  30  has a cylindrical shape to facilitate mounting of the test piece  12 . The test piece  12  can be mounted readily and stably on the distal end mounting portion  30  by insertion of the base tube  14  (refer to  FIG. 5 ). 
         [0074]    The blood glucose meter  10   a  is controlled by the internal control section  33  to continuously carry out projection of light to and reception of light from the test paper  20  by means of the measuring portion  32 , which is configured from an optical means. Further, the blood glucose meter  10   a  calculates a blood glucose level by performing a predetermined calculation based on a color reaction of light, and displays the blood glucose level on the monitor  34 . If a color reaction of the test paper  20  cannot be observed or is otherwise insufficient, then a predetermined error is displayed. The control procedure for blood glucose level measurement by the blood glucose meter  10   a  basically is the same as that of a conventional blood glucose meter according to the conventional art. 
         [0075]    The monitor  34  includes a blood glucose level display portion  34   a  for displaying a blood glucose level, and an auxiliary display portion  34   b  for displaying time and other information. The blood glucose level display portion  34   a  can display a three digit numerical value and a predetermined character display (for example, characters such as “OK”). Since some diabetics have weak sight, the monitor  34  is set sufficiently large taking visibility into consideration. On the auxiliary display portion  34   b,  patient identification data, operator identification data, and test piece identification data read by a later described barcode reader  48  also are displayed. The monitor  34  is flat on at least the liquid crystal display face portion thereof. 
         [0076]    The operation button group  38  is provided collectively on the proximal end side, and includes a power supply button  38   a,  movement buttons  38   b  and  38   c,  selection buttons  38   d  and  38   e,  and an LED display portion  38   f.  The movement buttons  38   b  and  38   c  function to move an item displayed on the monitor  34 , or to scroll the screen image together with movement of the displayed item, etc. The selection buttons  38   d  and  38   e  operate to select a function, which is displayed on the monitor  34 , corresponding to the position thereof. The LED display portion  38   f  functions to notify a state of the blood glucose meter by means of an LED, which emits light or blinks in various colors. 
         [0077]    The ejector lever  36  is a round-shaped lever, which is provided on an upper face  46   a  in proximity to the distal end mounting portion  30 . The ejector lever  36  can suitably be grasped by a finger, and includes a flat portion  36   a  on the proximal end side and a projecting portion  36   b  on the distal end side thereof. The ejector lever  36  is movable along the upper face  46   a.  A plurality of ribs, which extend in a lateral direction, are provided on the flat portion  36   a  for preventing slippage. The projecting portion  36   b  has a width and height suitable for being grasped by a finger. The ejector lever  36  is elastically biased toward the proximal end side by means of a suitably weak resilient member. If the ejector lever  36  is grasped by the finger in order to carry out a push out operation toward the distal end side, then the ejector lever  36  moves in parallel to an axial direction of the cylindrically shaped distal end mounting portion  30 . Thereupon, the ejector mechanism inside the ejector lever  36  moves in an interlocking relation, so as to push out the test piece  12  and enable removal of the test piece  12  from the distal end mounting portion  30 . Further, with the aforementioned configuration, wiping and cleaning in the vicinity of the ejector lever  36  can easily be carried out. 
         [0078]    The data reading button  40  is an operation switch for a barcode reader (optical data reading means)  48  provided at a rear end portion. The data reading button  40  can be easily operated if the data reading button  40  is disposed between the monitor  34  and the distal end mounting portion  30  on a face (hereinafter referred to as a monitor face) on which the monitor  34  is provided. Further, since the data reading button  40  is provided at this position, it is unnecessary to change the grasping position of the hand when measurement of a blood component and reading of data are carried out, which is efficient. 
         [0079]    A plurality of data reading buttons  40  may be provided at neighboring positions in accordance with applications to be performed thereby (for example, for reading patient identification data, measuring person identification data, and test piece identification data). Further, different processes can be executed in response to operation methods (depending upon a difference in a switch-on time, or a difference in the number of times that switching is performed within a predetermined short time period). 
         [0080]    As shown in  FIG. 4 , a barcode reader  48  is provided at a concave portion  49  on a rear end portion of the blood glucose meter  10   a.  The barcode reader  48  serves as a means for reading a barcode in order to obtain patient identification data, measuring person identification data, and test piece identification data by means of laser scanning. The barcode reader  48  is of a conventional laser type and is inexpensive. 
         [0081]    A rear end portion of the blood glucose meter  10   a  is inclined so as to expand toward the monitor screen as viewed in side elevation (refer to  FIG. 3 ). Since the barcode reader  48  is provided at the aforementioned inclined rear end portion within the concave portion  49 , the barcode reader  48  cannot be touched inadvertently, and thus the measurement face is less likely to become soiled. 
         [0082]    The blood glucose meter  10   a  has a function for storing blood glucose measurement values, which are measured a plural number of times, and can store blood glucose measurement values distinctively for individual patients, based on patient identification data read by the barcode reader  48 . Further, for so-called traceability, an operator who carries out blood glucose measurements can be specified for each measurement, based on measuring person identification data read by the barcode reader  48 . Further, based on identification data for specifying the type of test piece  12 , it can be confirmed that an appropriate test piece  12  has been used. Information read by the barcode reader  48  is identified by an operation method of the data reading button  40 , and such information is displayed distinctively on the monitor  34 . After the patient identification data, the measuring person identification data, and the test piece identification data have been read by the barcode reader  48 , a predetermined measurement mode is entered. Consequently, measurements can be started in accordance with the correct procedure. 
         [0083]    Since the barcode reader  48  is disposed at the rear end portion, the barcode reader  48  is oriented in an opposite direction along the direction of the arrow A toward the test piece  12 , and since the measuring portion  32  is disposed at the distal end in an opposite direction to the patient, it is less likely for the patient to experience discomfort. Further, since the barcode reader  48  is provided in an opposite direction, operations for measurement of blood glucose and reading of data can easily be distinguished from each other. 
         [0084]    Since the barcode reader  48 , the test piece  12  and the measuring portion  32  are provided on opposite sides from each other, there is a degree of freedom in design layout, and for example, an intermediate portion  46  can be formed suitably thin. An auxiliary function button, which has a function unique for hospital use, may be provided in place of the data reading button  40 . 
         [0085]    Next, the shape of the blood glucose meter  10   a  shall be described. For convenience of description, the display face of the monitor  34  is defined as an upper side, whereas the opposite side is defined as a lower side. However, naturally, orientation of the blood glucose meter  10   a  during use, during storage and so forth is not limited to such definitions. 
         [0086]    The housing of the blood glucose meter  10   a  is principally configured from an upper housing  42   a,  on which the monitor  34  and the operation button group  38  are provided, and a lower housing  42   b,  which is joined to the upper housing  42   a  and makes up a lower side portion. When the blood glucose meter  10   a  is placed on a table, at portions of the lower housing  42   b,  small projections  43  are provided where the lower housing  42   b  comes into contact with the table T. 
         [0087]    The blood glucose meter  10   a  can be segmented, as viewed from above (refer to  FIG. 2 ), into a main portion  44  on which the monitor  34  and the operation button group  38  are provided, and an intermediate portion  46 , which is provided between the main portion  44  and the distal end mounting portion  30 . The intermediate portion  46  is configured to have a width that decreases from the main portion  44  continuously and concavely toward the distal end side. The distal end mounting portion  30  is provided on a distal end face of the intermediate portion  46 . The data reading button  40  is provided directly at a boundary between the main portion  44  and the intermediate portion  46 , so that the data reading button  40  can be touched and operated easily. 
         [0088]    The main portion  44  includes the monitor  34  provided thereon and has a certain width, which enables the main portion  44  to be grasped by the hand of a user. The main portion  44  has a substantially fixed width as viewed from above (refer to  FIG. 2 ) in a longitudinal direction (in the direction of the arrow A shown in  FIGS. 2 and 3 ), and has a substantially fixed thickness in a vertical direction as viewed in side elevation (refer to  FIG. 3 ). Consequently, the main portion  44  can be grasped easily. Furthermore, the blood glucose meter  10   a  is symmetric in shape in leftward and rightward directions, and can be grasped easily by either the right hand or the left hand. 
         [0089]    The blood glucose meter  10   a  can be grasped not only at the main portion  44  but also at the intermediate portion  46 . As shown in  FIG. 7 , since the intermediate portion  46  has a width that decreases continuously and concavely toward the distal end side from the main portion  44 , and since the intermediate portion  46  is suitably thin and concave, the intermediate portion  46  can be grasped easily by the fingertips. Further, since the intermediate portion  46  is positioned near to the distal end mounting portion  30 , the mounted test piece  12  can be stabilized by grasping the intermediate portion  46 . 
         [0090]    On the intermediate portion  46 , a space is provided in a suitable direction, in which several mechanisms relating to the distal end mounting portion  30  (for example, the measuring portion  32  for the test paper  20 , an ejector mechanism for the test piece  12 , a mechanism for holding the distal end mounting portion  30 , and so forth) are disposed. Further, as a result of providing the intermediate portion  46 , the center axial line C of the test piece  12  can easily be oriented in an obliquely downward direction toward the distal end side. Further, the upper face  46   a  of the intermediate portion  46  is set substantially parallel to the center axial line C of the test piece  12 , and therefore the direction of the test piece  12  can easily be perceived visually. 
         [0091]    Further, the ejector lever  36  is provided on the upper face  46   a  of the intermediate portion  46 . Since the ejector lever  36  is moved along the upper face  46   a,  operation of the ejector lever  36  is facilitated and a space for movement of the ejector lever  36  can be assured. 
         [0092]    Assuming that the display face of the monitor  34  defines the upper side, whereas the opposite side to the display face defines the lower side as viewed in side elevation (see  FIG. 3 ), the center axial line C is directed obliquely downward toward the distal end side, with reference to a line of extension L of the display face of the monitor  34 . In other words, when the monitor  34  is placed on a horizontal table T (horizontal plane) with the display face of the monitor  34  directed upwardly, the center axial line C of the test piece  12  is directed obliquely downward toward the distal end side. At this time, the angle θ 1  defined between the line of extension L and the center axial line C is set at 27°, and the angle θ 2  defined between the line of extension L and the table T is set at 7°. Further, the test piece  12 , which is mounted on the distal end mounting portion  30 , is spaced from the table T, such that no unnecessary external forces are applied to the test piece  12 . 
         [0093]    A lower face of the main portion  44  and a lower face of the intermediate portion  46  are connected to each other by a continuous curved face portion  50 , which is concave as viewed in side elevation. A finger receiving projection  52  is provided at a neighboring portion on the proximal end side, as viewed from the curved face portion  50 . The finger receiving projection  52  has a low triangular shape as viewed in side elevation, and forms a smooth arc together with the curved face portion  50 , such that a space is formed into which a single finger can be inserted. If the radius of curvature of the curved face portion is 5 mm to 25 mm, and more preferably 8 mm to 20 mm, then a finger can easily be placed thereon in a suitable manner. Since, as described above, it is easy to place a finger on the curved face portion  50 , the blood glucose meter  10   a  can be grasped readily. 
         [0094]    In particular, as shown in  FIG. 6 , the blood glucose meter  10   a  can be grasped stably by placing a finger (for example, the forefinger) on the curved face portion  50 . Since the curved face portion  50 , the lower face of which is concave, is provided on the connecting portion between the main portion  44  and the intermediate portion  46 , the finger is placed on the curved face portion  50  in order to stabilize the blood glucose meter  10   a,  whereby optical reading by the barcode reader  48  can be carried out stably. 
         [0095]    Further, the data reading button  40  is provided on a side substantially opposite to the curved face portion  50 , and is held by and between the finger (for example, the forefinger) that is placed on the curved face portion  50  and another finger (for example, the thumb), which presses the data reading button  40 , so as to allow stable grasping and operation of the data reading button  40 . 
         [0096]    The concave curved face portion  50  can be used as a grasping portion. Further, since the concave curved face portion  50  is positioned near the distal end mounting portion  30 , it is easy to adjust the position of the spotted portion  22  with respect to a blood drop  60 , which makes operations as stable as possible. 
         [0097]    The distance H 1  between the spotted portion  22  of the blood glucose meter  10   a  and the table T is 13 mm, and the distance H 2  between the highest point P of the lower face and the table T is 11 mm. The highest point P forms a part of the curved face portion  50 . 
         [0098]    Since the spotted portion  22  is an operation object portion during blood glucose measurement, good visibility when operations are performed is demanded. Also, when the blood glucose meter  10   a  is placed on the table T, good visibility is required to enable state confirmation. Although it is preferable for the spotted portion  22  to be kept in a spaced relation from the table T, the spotted portion  22  should not be spaced away from the table T needlessly. Further, as hereinafter described (refer to  FIGS. 12 and 13 ), if it is taken into consideration to carry out a spotting operation while the blood glucose meter  10   a  is kept in place on the table T, there is a suitable range for the distance H 1 . From such a point of view, it is preferable to set the distance H 1  within a range from 3 mm to 30 mm, and more preferably, within a range from 9 mm to 14 mm. 
         [0099]    When the blood glucose meter  10   a,  which is placed on the table T, is grasped, preferably, a suitable gap is provided for placement of a finger between the highest point P and the table T. Preferably, the distance H 2  is set within a range from 3 mm to 20 mm, and more preferably, within a range from 7 mm to 12 mm. 
         [0100]    Next, a method of using the blood glucose meter  10   a,  which is configured in the foregoing manner, shall be described. 
         [0101]    First, a power supply to the blood glucose meter  10   a  is made available, and a predetermined barcode, which is indicated on an individualized package for the test piece  12 , is read by the barcode reader  48 . 
         [0102]    Then, as seen in  FIG. 8 , a health care worker  62  directs the barcode reader  48  toward a card, on which a barcode  62   b  representative of operator identification data of the health care worker  62  is provided, and depresses the data reading button  40  in order to read the operator identification data. The data is recorded together with a blood glucose measurement value. Such data is used, for example, for confirmation of traceability of the procedure. 
         [0103]    At this time, as made clear in  FIG. 8 , since the barcode reader  48  is directed toward the health care worker  62 , the laser beam does not hit upon a patient  64  and the patient  64  does not experience any discomfort. 
         [0104]    Further, since the barcode reader  48  is provided on an opposite side to the test piece  12 , and the data reading button  40  is provided at a position where the button can be operated readily by the thumb or the like, there is no need to change the grasping position of the hand when measurement of a blood component and reading of data are performed, which is efficient. 
         [0105]    Thereafter, as shown in  FIG. 9 , patient identification data of the patient  64 , which is indicated on a wrist band  64   a,  is read by the barcode reader  48 . Consequently, when a single blood glucose meter  10   a  is used for taking blood glucose measurements of a plurality of patients, the measured blood glucose levels can be stored distinctively for individual patients. 
         [0106]    After the patient identification data, measuring person identification data, and test piece identification data have been read in this manner, the blood glucose meter  10   a  enters into a measurement mode. 
         [0107]    Thereafter, the cap  39  is removed, and the test piece  12  is pushed into the distal end mounting portion  30  together with the individual package casing, until a click is felt. Thereafter, only the casing is removed. By this operation, the test piece  12  becomes mounted on the distal end mounting portion  30 . After the test paper  20  has been detected, the measuring portion  32  displays the word “OK” on the monitor  34 , and then automatically enters into the blood glucose measurement mode. Further, puncturing is carried out by a predetermined puncturing device in order to provide a blood drop  60  on a fingertip (in the following description, on the forefinger of the left hand). 
         [0108]    As shown in  FIG. 10 , the patient then carries out a spotting action by bringing the spotted portion  22  of the test piece  12  into contact with the blood drop  60 , while the patient grasps the blood glucose meter  10   a  with the right hand. At this time, the left and right wrists or neighboring portions thereof are placed in a stabilized state on the table T. 
         [0109]    As is apparent from  FIG. 10 , if the left and right wrist portions are placed in an ordinary manner on the table T, then backs of the hands are directed obliquely outward while the forefinger of the left hand is directed inwardly, and the main portion  44  of the blood glucose meter  10   a,  which is grasped by the palm of the right hand, is directed obliquely inward. Consequently, since the intermediate portion  46  is bent at an angle of θ 1  (=27°) with respect to the main portion  44 , the projection  18  and the center axial line C of the test piece  12  are directed inwardly and extend substantially in a horizontal direction toward the blood drop  60 . At this time, the blood drop  60  on the left hand and the spotted portion  22  on the right hand side are directed inwardly and positioned near to each other. In addition, the line of sight of the patient is not interrupted, and consequently, visibility is good. 
         [0110]    Then, the right hand and the left hand are moved toward each other substantially in a horizontal direction in order to carry out the spotting operation, while both wrist portions remain placed on the table T, as shown in  FIG. 11 . 
         [0111]    At this time, it is only necessary to lightly twist both wrist portions inwardly, which is a simple operation that can be carried out stably, in a state in which the wrist portions remain placed on the table T. Accordingly, even in the event that the fingers are impaired, or if the person is unfamiliar with operations of the blood glucose meter  10   a,  the blood drop  60  and the spotted portion  22 , both of which are small, can be brought into contact with each other without any shaking of the fingers. Consequently, a reliable spotting operation can be carried out. Since the projection  18  and the center axial line C are placed in contact with each other in a state in which the projection  18  and the center axial line C are directed toward the blood drop  60 , the blood drop  60  can be prevented from coming into contact and sticking to a peripheral portion of the spotted portion  22 , a side face of the projection  18 , or a portion of the flange  16 . 
         [0112]    As seen in  FIG. 12 , in order to carry out the spotting operation more reliably, while the blood glucose meter  10   a  is placed on the table T, the blood glucose meter  10   a  may be moved closer in order to carry out spotting in a state in which one finger  68  (for example, the forefinger) on which the blood drop  60  is formed remains placed on the table T. 
         [0113]    As described above, the distance H 1  of the spotted portion  22  from the table T is 13 mm. Meanwhile, if one finger  68  is placed on the table T, then the height of the blood drop  60  is approximately within a range from 3 mm to 20 mm, and ordinarily, is approximately within a range from 5 mm to 14 mm. Thus, even if the height H 1  is not initially 13 mm, since the direction and height of the finger  68  can be adjusted within such a range, it is easy to adjust the height with respect to the spotted portion  22 , and it is easy to bring the spotted portion  22  into contact with the blood drop  60 . At this time, since the finger  68  and the blood glucose meter  10   a  are placed directly on the table T, the finger  68  and the blood glucose meter  10   a  are kept highly stable, respectively, so that the spotting operation can be carried out reliably. 
         [0114]    Alternatively, another finger  69  (for example, the middle finger), which is adjacent to the finger  68  on which the blood drop  60  is formed, may be placed on the table T while the finger  68  is placed atop the finger  69 , as seen in  FIG. 13 . If the two fingers  68  and  69  are placed on the table T in this manner, then the height of the blood drop  60  on the upper side finger  68  varies depending on the manner in which the fingers are crossed, the manner of placement of the fingers, and so forth. However, the height as described above generally lies within a range from 5 mm to 30 mm, and ordinarily, lies within a range approximately from 9 mm to 20 mm. Even if the height is not 13 mm initially, since the direction and the height of the finger  68  can be adjusted within such a range, it is easy to adjust the height with respect to the spotted portion  22 , and it is easy to bring the spotted portion  22  into contact with the blood drop  60 . At this time, since the blood glucose meter  10   a  is placed directly on the table T, the blood glucose meter  10   a  is kept highly stable. The finger  68 , which is placed on the finger  69 , also is kept stable in a suitable manner, whereby a reliable spotting operation can be carried out. 
         [0115]    In particular, if the finger  68  alone is placed on the table T (refer to  FIG. 12 ), then stability is high. However, if two fingers, i.e., the finger  68  and the finger  69 , are placed on the table T (as shown in  FIG. 13 ), then adjustment of the height of the spotted portion  22  is facilitated. Therefore, either one of the aforementioned spotting operations may be carried out, depending upon the practice and preferences of the patient. 
         [0116]    However, if three or more fingers (for example, the forefinger, the middle finger, and the ring finger) are placed on the table T, then even with a healthy person, the finger (forefinger), which is positioned on top of the other fingers, becomes unstable. Moreover, with a patient whose fingers are impaired, the finger that is placed on top sometimes becomes considerably unstable, and it is rather difficult to carry out a spotting operation. Accordingly, it is preferable to set the distance H 1  from the table T to the spotted portion  22  to lie within a range from 3 mm to 30 mm, and more preferably, within a range from 9 mm to 14 mm, which represents a height corresponding to one or two fingers. 
         [0117]    Naturally, as a method of using the blood glucose meter  10   a,  in a case where there is no possibility for shaking of the hands or the like to occur, the spotting operation may be carried out in midair, without using the table T. 
         [0118]    Consequently, when a correct spotting operation is carried out, the blood drop  60  is sucked into the blood introduction path  24  due to capillary action, whereby the test paper  20  becomes impregnated with blood to a sufficient degree. Thus, the test paper  20  exhibits a color reaction with a reagent in response to the blood glucose level. The measuring portion  32  observes the color reaction of the test paper  20 . Then, at a stage in which the color reaction becomes stabilized, based on such a color reaction, the control section  33  performs a predetermined calculation in order to calculate the blood glucose level, and the blood glucose level is displayed on the monitor  34 . Further, a notification may be issued by a buzzer in order to indicate that the measurement operation has ended. During observation of the color reaction and during calculation of the blood glucose level, in order to indicate the progress of such observation, a scheduled period of time until measurement is completed may be displayed on the monitor  34 . 
         [0119]    Thereafter, as a post-processing procedure, in a state where the test piece  12  is covered with the individual package cover, the ejector lever  36  is operated in order to remove the test piece  12  together with the cover. Then, the power supply is turned off, and the cap  39  is placed on the distal end mounting portion  30 . 
         [0120]    The operation method illustrated in  FIGS. 10 to 13  is applied to a case in which the blood glucose meter  10   a  is intended for personal use, in which a patient carries out blood glucose measurement. Alternatively, a health care worker  62  may carry out operations using the blood glucose meter  10   a,  as shown in  FIGS. 14 and 15 . In the case where a health care worker  62  carries out the spotting operation for the patient  64 , since the intermediate portion  46  is bent downwardly with respect to the main portion  44 , even in a state where the intermediate portion  46  is inclined to some degree, the main portion  44  continues to lie substantially horizontal. Consequently, the health care worker  62  can grasp the blood glucose meter  10   a  in a comfortable posture with the elbows allowed to suspend downwardly. Further, the palm  66  does not cause a blind spot or otherwise hinder visibility of the blood drop  60  and the spotted portion  22 , and visibility is good. Accordingly, when used in a hospital as well, the blood glucose meter  10   a  allows the spotted portion  22  to be brought into contact with the blood drop  60  easily and reliably so that measurement errors can be suppressed.  FIG. 14  illustrates a case in which a health care worker  62  carries out a spotting operation for a patient  64  in a reclining state on a bed  63 . 
         [0121]    As is apparent from  FIG. 15 , at this time, even if the data reading button  40  is depressed inadvertently, the laser beam, which is emitted from the barcode reader  48 , does not impinge upon the patient  64 . 
         [0122]    The process illustrated in  FIG. 8 , the process illustrated in  FIG. 9 , and the blood glucose measuring process subsequent thereto may be carried out in any order. Among the reading processes of individual identification data, one or more of such processes may be carried out. Alternatively, a configuration in which reading of data is carried out while blood glucose measurement is carried out simultaneously therewith may also be adopted. 
         [0123]    As described above, with the blood glucose meter  10   a  according to the present embodiment, the test piece  12  is provided on the distal end mounting portion  30 , and the barcode reader  48  is provided on the opposite rear end face. Therefore, even if the data reading button  40  is depressed inadvertently, a laser beam for scanning is not emitted in a direction toward the patient, and the patient does not experience discomfort. Also, upon reading of patient identification data, although the laser beam may occasionally be oriented in a direction toward the patient, at this time, the user carries out the operation while attention is focused on laser reading, and further, the laser beam merely impinges upon the wrist band  64   a  and is not directed toward the face of the patient. 
         [0124]    Further, the barcode reader  48  and the test piece  12  are sufficiently spaced away from each other, and the measurement directions thereof are opposite to each other. Therefore, when reading by the barcode reader  48  is carried out, a situation in which the test piece  12  comes into contact against some other substance does not occur. In other words, before the blood glucose level is measured, the spotted portion  22  of the test piece  12  does not become soiled or broken, so that correct measurement can be carried out. After a blood glucose level measurement has been performed, although blood sticks to the spotted portion  22 , a situation in which the blood sticks to and becomes soiled due to some other substance does not occur. 
         [0125]    Further, the monitor  34  is provided on the rear side with respect to the data reading button  40 , and the intermediate portion  46  and the distal end mounting portion  30 , which are provided on the distal end side with respect thereto, are suitably thin and light and in good balance. Thus, if the intermediate portion  46  or the curved face portion  50  is grasped, then the test piece  12 , which is positioned closely thereto, can be stabilized (refer to  FIG. 7 ). 
         [0126]    Furthermore, since the blood glucose level measuring operation by the test piece  12 , and reading of data by the barcode reader  48  are clearly different from each other, incorrect operations are prevented. By using the barcode reader  48  as an optical data reading means, simple and convenient reading of data can be achieved in a contactless manner. The optical data reading means is oriented suitably, and can carry out reliable reading of data without the possibility of interference, as in wireless communications. 
         [0127]    Since the curved face portion  50 , the lower face of which is concave, is provided at a location of connection between the main portion  44  and the intermediate portion  46 , a finger can be placed thereon in order to stabilize the blood glucose meter  10   a,  so that optical reading by the barcode reader  48  can be carried out stably. 
         [0128]    Data read by the barcode reader  48  may be transferred to a predetermined data management computer through a predetermined communication port, a memory card, or the like. An optical data transmission means (for example, IrDA (Infrared Data Association)) may be provided in accordance with the optical data reading means, such that data of measured blood glucose levels or the like can be transmitted to the management computer. 
         [0129]    Further, the blood glucose meter  10   a  according to the present embodiment is shaped such that, when the blood glucose meter  10   a  is placed on a horizontal table T, the center axial line C of the test piece  12  is directed obliquely downward toward the distal end side. (In other words, the blood glucose meter  10   a  is shaped such that the center axial line C is directed obliquely downward toward the distal end side, with reference to a line of extension L of the display face of the monitor  34 ). Consequently, it is easy to orient the spotted portion  22  of the test piece in a direction toward the blood drop, and the spotted portion  22  of the test piece  12  can be brought into contact with the blood drop  60  obtained by puncture easily and reliably, so that measurement errors can be suppressed. 
         [0130]    In order to orient the spotted portion  22  more correctly in a direction toward the blood drop  60 , the angle  81  defined between the line of extension L and the center axial line C is set to 10° or greater, and more preferably, to 15° or greater. On the other hand, if the angle θ 1  is set to a large value, then since the intermediate portion  46  may be directed downwardly by an excessive amount, there is a possibility, when the blood glucose meter  10   a  is grasped and the blood glucose meter  10   a  is positioned, for visibility of the spotted portion  22  to become worse. Further, the feeling of stability may become impaired, or the spotted portion  22  may not be oriented properly in a direction toward the blood drop  60 , or when the blood glucose meter  10   a  is placed in position, the test piece  12  may come into contact with the table T. Accordingly, the angle θ 1  is set to 40° or less, and more preferably, to 30° or less. Ultimately, when attention is paid to influence on dimensions of the associated portions, the angle θ 1  may be set within a range of 10° to 40°, and more preferably, within a range of 15° to 30°. 
         [0131]    Next, blood glucose meters  10   b,    10   c  and  10   d  according to certain modifications shall be described. Portions of the blood glucose meters  10   b  to  10   d,  which are the same as those of the blood glucose meter  10   a,  are denoted by like reference characters and detailed descriptions of such features shall be omitted. 
         [0132]    As shown in  FIG. 16 , in the blood glucose meter  10   b  according to the first modification, the distal end mounting portion  30  of the blood glucose meter  10   a  is replaced by a distal end mounting portion  72  on which a test piece  70  can be mounted. As shown in  FIG. 17 , the test piece  70  is in the form of a thin narrow plate having a blood introduction path  74  provided on a center axial line C thereof. A conventional article can be used as the test piece  70 . 
         [0133]    Differently from the blood glucose meter  10   a  described above, in the blood glucose meter  10   b,  the measuring portion  32  measures the blood glucose level of sampled blood based on a current value, which is calculated not by an optical means but by an electro-chemical sensor. 
         [0134]    In the blood glucose meter  10   b,  similar to the blood glucose meter  10   a  described above, the center axial line C of the test piece  70  is directed obliquely downward toward the distal end side, and the angle θ 1  defined between the line of extension L and the center axial line C is set to 27°. 
         [0135]    As shown in  FIGS. 18 and 19 , the blood glucose meter  10   c  according to the second modification is configured for personal use, and includes a smaller number of buttons that make up the operation button group  38 . The blood glucose meter  10   c  according to the second modification does not include a data reading button  40  (auxiliary function button), and is smaller in size in comparison with the blood glucose meter  10   a.  Further, a monitor  76  for displaying blood glucose levels is smaller than the monitor  34  described above. 
         [0136]    Since the blood glucose meter  10   c  is smaller than the blood glucose meter  10   a,  based on the dimensions of associated portions, the angle θ 1  defined between the line of extension L and the center axial line C is set at 18°, the angle θ 2  is set at 5°, H 1  is set at 10 mm, and H 2  is set at 7 mm. 
         [0137]    As shown in  FIG. 20 , the blood glucose meter  10   d  according to the third modification has a small and thin profile, which facilitates carrying thereof, and the blood glucose meter  10   d  does not include a portion corresponding to the intermediate portion  46  described above, but rather includes a distal end mounting portion  30 , which is provided at a distal end portion end face  78  thereof. The distal end portion end face  78  has a shape, which is inclined obliquely as viewed in side elevation (the side elevational view is omitted), and the center axial line C of the test piece  12  is directed obliquely downward toward the distal end side, with reference to the line of extension L of the display face of the monitor  80 . 
         [0138]    In the blood glucose meters  10   b  to  10   d  according to the first to third modifications described above, the center axial line C of the test piece  12  (or the test piece  70 ) is directed obliquely downward toward the distal end side with reference to the line of extension L, similar to the blood glucose meter  10   a  described above. Accordingly, in both blood glucose meters for hospital use as well as for personal use, it is easy to direct the spotted portion  22  of the test piece  12  (or the test piece  70 ) toward the blood drop  60 , and the spotted portion  22  can be brought into contact readily and reliably with the blood drop  60  obtained by puncture. Consequently, errors in measurement can be suppressed. 
         [0139]    Although the blood glucose meters  10   a  to  10   d  measure blood glucose levels as a property of a sample, the present invention is not limited to this example, but can also be applied as an apparatus (blood component measuring apparatus) for measuring hormone levels, cholesterol concentrations, or the like. 
         [0140]    The barcode reader  48  in the blood glucose meters  10   a  and  10   b  may comprise another type of optical data reading means, which may be, for example, any of a manual scan type, a CCD scan type, a laser scan type, an image sensing type, or the like. 
         [0141]    With a scan type apparatus made up of a CCD camera, reading of a two-dimensional code is possible, whereby the amount of information that can be read increases. In the case that a two-dimensional code is read, for example, predetermined prescription information or the like may be read and verified together with a measured blood glucose level in order to determine an insulin dose. However, the type of data to be read by the barcode reader  48  is not limited to the aforementioned example. 
         [0142]    The blood component measuring apparatus according to the present invention is not limited to the embodiment described above, but naturally various other configurations could be adopted without departing from the subject matter of the present invention.