reference will now be made in detail to the preferred embodiment of the present invention , examples of which are illustrated in the drawings attached hereinafter , wherein like reference numerals refer to like elements throughout . the embodiments are described below so as to explain the present invention by referring to the figures . terms used herein are those used generally in the art unless otherwise being defined herein , in which case such terms are described in the specification and they should be construed by replying on the description . also , detailed description of the subject matter that is known to those skilled in the art and is not directly related to the present invention is omitted for simplicity . fig5 is a cross - sectional view showing a dissembled state of an electrode device for measuring impedance of a human body according to the first embodiment of the present invention and fig6 is a cross - sectional view showing an assembled state of the electrode device of fig5 . the electrode device according to the first embodiment , as shown in fig5 and 6 , comprises a cylindrical housing member ( 10 ), a resilient member ( 20 ), and a cylindrical electrode member ( 30 ). the cylindrical housing member ( 10 ) has an opening at the bottom thereof . a guide rod ( 11 ) extends from the inner surface of the top of the cylindrical housing member ( 10 ) and extends through the opening of the bottom of the cylindrical housing member ( 10 ). the cylindrical electrode member ( 30 ) has an opening at the top thereof . the cylindrical electrode member ( 30 ) is configured to be pressed against the skin of a human body to move back and forth through the opening of the bottom thereof along the guide rod ( 11 ). the resilient member ( 20 ) surrounds the guide rod ( 11 ) and is interposed between top of the cylindrical electrode member ( 30 ) and the top of the cylindrical housing member ( 10 ) to resiliently move the cylindrical electrode member ( 30 ) back and forth . the cylindrical electrode member ( 30 ) can be an electrode made of a conductive material . it can also be an electrode coated with a conductive material . any material that shows conductivity can be used as the conductive material . preferably , the conductive material is non - toxic to a human body . as an example , an electrode made of a gold or an electrode coated with gold can be used . the cylindrical electrode member ( 30 ) has an open end . a protruding portion ( 31 ) is formed at the top of the cylindrical electrode member ( 30 ). the protruding portion ( 31 ) may be formed in any shape that can facilitate engagement between the cylindrical electrode member ( 30 ) and the cylindrical housing member ( 10 ). the cylindrical housing member ( 10 ) can be made of a conductive material . it can also be coated with a conductive material . any material that shows conductivity can be used as the conductive material . as an example , an electrode made of gold or an electrode coated with gold can be used . also , a copper wire or an iron wire can be used . a first protruding portion ( 12 ) is formed at the bottom of the cylindrical housing member ( 10 ). the first protruding portion ( 12 ) is formed in any shape that can facilitate engagement between the cylindrical electrode member ( 30 ) and the cylindrical housing member ( 10 ). a second protruding portion ( 13 ) is formed at the top of the cylindrical housing member ( 10 ). the resilient member ( 20 ) can be made of any material that can show resilient features . the resilient material can also be a conductive material . as an example , a spring can be used . fig7 is a cross - sectional view showing an example of application of the electrode device of fig5 . as shown in fig7 , when the cylindrical electrode member ( 30 ) is pressed against the skin of a human body , the cylindrical electrode member ( 30 ) can be moved along the guide rod by the resilient member ( 20 ) according to the curvature of the skin . accordingly , the depths of the cylindrical electrode members that are attached to the skin can be set to be a certain value . this can avoid a prior art problem that impedance was not be able to be measured precisely since the depths of electrode devices attached to the skin are not constant . the reference number 100 refers to a base plate in which electrode devices according to the present invention are mounted . fig8 is a perspective view of an apparatus for measuring impedance of a human body according to a first embodiment of the present invention , and fig9 is a perspective view of the bottom of the apparatus of fig8 . as shown in fig8 and 9 , the apparatus according to the first embodiment comprises a base plate ( 100 ) and a plurality of electrode devices ( 200 ). the base plate ( 100 ) has a plurality of electrode holes ( 110 ) and a plurality of first needle holes ( 120 ). the electrode holes ( 100 ) are arranged in an x - y lattice structure . the first needle holes ( 120 ) are arranged in an x - y lattice structure such that they are arranged with the electrode holes ( 100 ) alternately . the electrode devices each are mounted in the respective electrode holes ( 110 ). the electrode devices are connected to a plurality of first and second electrical lines ( 300 , 310 ), which will be described in detail with reference to fig2 . the base plate ( 100 ) can be made of any soft material that can make the base plate curved according to the curvature of the skin of a human body . as an example , it can be made of silicone . the distance between two adjacent electrode holes and the distance between two adjacent first needle holes are not limited to a specific value . preferably , the distances can be set in a range of 5 mm to 20 mm . the width of the first needle holes each is not limited to a specific value . it can be appropriately set according to the kind of a needle and / or the purpose of acupuncture . fig1 is a perspective view showing the apparatus of fig8 comprising an exemplary cover and fig1 is a perspective view showing the bottom of the apparatus comprising the cover . the exemplary cover ( 400 ), as shown in fig1 and 11 , is configured to be engaged with the base plate ( 100 ) to protect the electrode devices ( 200 ) and the first and second electrical lines ( 300 , 310 ). the cover ( 400 ) has a plurality of second needle holes ( 410 ). the second needle holes ( 410 ) are arranged in the cover ( 400 ) such that the respective second needle holes ( 410 ) can be positioned over the respective first needle holes ( 120 ) of the base plate ( 100 ) when the cover ( 400 ) is engaged with the base plate ( 100 ). the second needle holes can be designed to have the same width as the first needle holes . preferably , as shown in fig1 , the second needle holes ( 410 ) can be designed such that the outer width is greater than the inner width , which makes it easier for a user to insert a needle to the second needle holes ( 410 ). in some embodiments , at least one identifying member ( 430 ) may be provided on the cover ( 400 ) to make it easier for a user to handle the cover ( 400 ). the cover ( 400 ) can be made of any material that can perform the above - described function . as an example , it can be made of silicone . the cover ( 400 ) is provided with a connecting hole ( 420 ) through which electrical lines can be connected . fig1 is perspective view showing the apparatus of fig8 comprising another exemplary cover . as shown in fig1 , the cover ( 500 ) is in the form of a hemisphere . the cover ( 500 ) has a plurality of second needle holes ( 510 ). the second needle holes ( 510 ) are arranged in the cover ( 500 ) such that the respective second needle holes ( 510 ) can be positioned over the respective first needle holes ( 120 ) of the base plate ( 100 ) when the cover ( 500 ) is engaged with the base plate ( 100 ). in some embodiments , the base plate ( 100 ) is designed to be flexible so as to become curved according to the curvature of the skin , as shown in fig1 while the base plate ( 100 ) is flat in normal condition , as shown in fig1 . in some embodiments , as shown in fig1 , the cover ( 500 ) has a plurality of guide hole members ( 540 ) each connecting the first needle holes ( 120 ) and the second needle holes ( 510 ) to make it easier for a user to handle a needle . as described above , preferably , the second needle holes ( 510 ) can be designed such that the outer width is greater than the inner width , which makes it easier for a user to insert a needle to the second needle holes ( 510 ). the cover ( 500 ) can be made of any material that can perform the above - described function . as an example , it can be made of silicone . the cover ( 500 ) is provided with a connecting hole ( 520 ) through which electrical lines can be connected . in some embodiments , at least one identifying member ( 530 ) may be provided on the cover ( 500 ) to make it easier for a user to handle the cover ( 500 ). fig1 and 18 are perspective views showing the apparatus of fig8 comprising another exemplary cover and fig1 is a perspective view showing the bottom of the apparatus comprising the cover shown in fig1 . as shown in the drawings , the cover ( 600 ) is in the form of a cylinder . the cover ( 600 ) has a plurality of second needle holes ( 610 ). the second needle holes ( 610 ) are arranged in the cover ( 600 ) such that the respective second needle holes ( 610 ) can be positioned over the respective first needle holes ( 120 ) of the base plate ( 100 ) when the cover ( 600 ) is engaged with the base plate ( 100 ). in some embodiments , the base plate ( 100 ) is designed to be flexible so as to become curved according to the curvature of the skin , as shown in fig1 while the base plate ( 100 ) is flat in normal condition , as shown in fig1 . in some embodiments , as shown in fig2 , the cover ( 500 ) has a plurality of guide hole members ( 640 ) connecting the first needle holes ( 120 ) and the second needle holes ( 610 ) to make it easier for a user to handle a needle . as described above , preferably , the second needle holes ( 610 ) can be designed such that the outer width is greater than the inner width , which makes it easier for a user to insert a needle to the second needle holes ( 610 ). the cover ( 600 ) can be made of any material that can perform the above - described function . as an example , it can be made of silicone . the cover ( 600 ) is provided with a connecting hole ( 620 ) through which electrical lines can be connected . in some embodiments , at least one identifying member ( 630 ) may be provided on the cover ( 600 ) to make it easier for a user to handle the cover ( 600 ). fig2 shows electrode devices and electrical lines of an apparatus according to the first embodiment of the present invention . the electrode devices ( 200 ) and the first needle holes ( 120 ) are positioned on the base plate ( 100 ) such that they are alternating with each other . the first electrical lines ( 300 ) are formed between the respective electrode devices ( 200 ) and the respective first needle holes ( 120 ) in the direction of x - axis . the second electrical lines ( 310 ) are formed between the respective electrode devices ( 200 ) and the respective first needle holes ( 120 ) in the direction of y - axis . the respective first and second electrical lines ( 300 , 310 ) are connected to the respective electrode devices ( 200 ). current is allowed to flow through the x - axis and y - axis sequentially to measure impedances . for example , with the second vertical line s 2 as an input electrode and the first horizontal line r 1 as a receiving electrode , the impedance of the first horizontal needle hole h 1 can be measured . also , with the first vertical line s 1 as an input electrode and the second horizontal line r 2 as a receiving electrode , the impedance of the first vertical needle hole v 1 can be measured . accordingly , if current is allowed to flow from the first vertical line s 1 to the eleventh vertical line s 11 sequentially to act as input electrodes and from the horizontal line r 1 to the eleventh horizontal line r 11 to act as receiving electrodes , impedances can be measured sequentially with regard to all of the vertical and horizontal needle holes of the base plate ( 100 ). the measured impedances can be displayed as a 3 - dimensional image by being coupled with ct or mri devices . fig2 is a perspective view of an apparatus according to the second embodiment of the present invention and fig2 is a perspective view of the bottom of the apparatus of fig2 . as shown in fig2 and 23 , the apparatus according to the second embodiment comprises a circular base plate ( 100 ) and a plurality of electrode devices ( 200 ). the circular base plate ( 100 ) includes a plurality of electrode hoes ( 110 ) and a plurality of first needle holes ( 120 ). the electrode holes ( 110 ) and first needle holes ( 120 ) are formed eccentrically and alternately , as shown in fig2 . the electrode devices ( 200 ) are mounted to the electrode holes ( 110 ) and connected to a first and second electrical lines ( 300 , 310 ) fig2 shows electrode devices and electrical lines of the apparatus of fig2 . the first and second electrical lines ( 300 , 310 ) are connected to the electrode devices alternately . current is allowed sequentially to measure impedances . for example , with the second input line s 2 as an input electrode and the twelveth receiving line r 12 as a receiving electrode , the impedances of the first , third , fifth , and seventh needle holes h 1 , h 3 , h 5 , and h 5 can be measured . also , with the first input line s 1 as an input electrode and the first receiving line r 1 as a receiving electrode , the impedances of the second , fourth , and sixth needle holes h 2 , h 4 , and h 6 can be measured . accordingly , if current is allowed to flow from the first input line s 1 to the twelveth input line s 12 and from the first receiving line r 1 to the twelveth receiving line r 12 sequentially to act as input electrodes and receiving electrodes , respectively , the impedances can be measured sequentially with regard to all of needle holes of the base plate ( 100 ). fig2 is a plane view of an apparatus according the third embodiment of the present invention . in this embodiment , a plurality of base plates ( 100 ) are provided radially with a predetermined distance between two adjacent base plates ( 100 ). each of the base plates has a plurality of electrode holes and a plurality of first needle holes ( 120 ). the electrode holes and the first needle holes are mounted alternately . current is allowed sequentially to measure impedances . for example , with the first input line s 1 as an input electrode and the first receiving line r 1 as a receiving electrode , the impedance of the first needle hole h 1 can be measured . also , with the second input line s 2 as an input electrode and the first receiving line r 1 as a receiving electrode , the impedance of the second needle hole h 2 can be measured . accordingly , if current is allowed to flow sequentially , the impedances can be measured sequentially with regard to all of needle holes of the base plate ( 100 ). fig2 is a plane view of an apparatus according the fourth embodiment of the present invention . in this embodiment , the apparatus comprises a base plate , a plurality of electrode devices , and first and second electrical lines . the base plate has a plurality of radial holes provided radially with a predetermined distance between two adjacent holes . the base plate has a plurality of electrode holes and a plurality of first needle holes between two adjacent radial holes . the electrode holes and the first needle holes are mounted alternately . the electrode devices are mounted to the electrode holes . the first and second electrical lines are connected to the electrode devices alternately . as the principle of measuring impedances is similar to the principle described with regard to fig2 , detailed description thereof is omitted . the foregoing descriptions of specific exemplary embodiments of the present invention have been presented for purposes of illustration and description . they are not intended to be exhaustive or to limit the invention to the precise forms disclosed , and obviously many modifications and variations are possible in light of the above teachings . the exemplary embodiments were chosen and described in order to explain certain principles of the invention and their practical application , to thereby enable others skilled in the art to make and utilize various exemplary embodiments of the present invention , as well as various alternatives and modifications thereof . it is intended that the scope of the invention be defined by the claims appended hereto and their equivalents .
the present invention relates to an electrode device for measuring impedance within a human body , and to an apparatus using the same for measuring impedance within a human body and performing acupuncture treatment using the measured impedance , which can automatically and precisely determine locations of meridians within the human body , form a three - dimensional image of the determined locations , and enable acupuncture treatment to be performed precisely . the electrode device for measuring impedance within a human body comprises : a cylindrical housing member having a guide rod mounted to an open side thereof ; a cylindrical electrode member configured to be pressed against the skin of a human body and moved back and forth through the open side along the guide rod ; and a resilient member interposed between the cylindrical electrode member and the cylindrical housing member to resiliently move the cylindrical electrode member back and forth along the guide rod .