Abstract:
The present invention is a method for obtaining an electrical signal from a patient that corresponds to a meridian. The present method contemplates locating a dermal area of a patient proximate a meridian. One embodiment of the present invention comprises locating a dermal area by iteratively measuring and comparing the conductivity of a patient&#39;s skin until a significant level of conductance is indicated. A probe may then be placed in contact with the dermal area, and actuated to obtain an electrical signal therefrom. The probe tip may be specially designed to apply an appropriate amount of pressure to the dermal area to directly sense a meridian, and configured to avoid erroneous measurements resulting from misalignment of the probe or probe tip.

Description:
BACKGROUND OF THE INVENTION 
   1. Field of the Invention 
   The present invention relates to a method for obtaining electrical signals from a patient to assess a medical condition. In particular, the present invention relates to a method for accurately locating a meridian transdermally and obtaining a value for an electrical attribute corresponding to such a meridian. 
   2. Background and Related Art 
   Traditional medical science has long recognized certain electrical characteristics of humans and other living organisms. For example, the traditional medical community has recognized electrical potentials generated by the human body in such forms as brain waves, detected by electro-encephalographs (EEG), electrical impulses resulting from muscular heart activity, as detected by electrocardiograms (EKG), and other electrical potentials measurable at other areas of the human body. While the levels of electrical activity at sites on the human body are relatively small, such signals are nonetheless measurable and consistent across the species. 
   In addition to measurable currents, the human body and other mammalian organisms exhibit specific locations where a resistance value and, inversely, a conductance value are relatively predictable for healthy individuals. These locations, known as anatomical dermal conductance points, exhibit unique resistance values. Interestingly, such locations exhibit a resistive reading of approximately 100,000 ohms and coincide with the acupuncture points defined anciently by the Chinese. 
   Ancient Chinese medical practitioners treated many unfavorable health conditions by inserting thin needles into the body at specific points to pierce peripheral nerves, a technique commonly known as acupuncture. Acupressure is a gentle, noninvasive form of the ancient Chinese practice of acupuncture that implements thumb or finger pressure or electrical stimulation at these same points, also known as acupressure points, to provide similar results. 
   The representative acupressure points and their relationship with organs and life systems of the human body have been characterized into more than 800 points that are organized into approximately 12 basic meridians that run along each side of the body. Each pair of meridians corresponds to a specific organ or function such as stomach, liver, spleen/pancreas and lung. Acupressure points are named for the meridian they lie on, and each is given a number according to where along the meridian it falls. For example, Spleen  6  is the sixth point on the Spleen meridian. The measurable attributes of each acupressure point reflect the energetic condition of the inner organ or other functions of the human body corresponding to such point. 
   Acupressure points are generally located at the extremity region of the hands and feet. As introduced above, the resistance value of healthy tissue measured at an acupressure point is generally in the range of about 100,000 ohms. When conditions arise affecting higher conductivity readings, perhaps from inflammation or infection, the measured resistance value becomes less than 100,000 ohms. Likewise when conditions arise affecting lower conductivity readings, perhaps from tissue fatigue or a degenerative state, conductivity is reduced, causing the resistance value to be higher. 
   Systems have been implemented to measure a resistance, voltage, and/or current values at acupressure points located on a meridian and to present the values to a clinician for use in assessing a condition. Traditional systems, however, have proven difficult to use in pinpointing the precise location of such acupressure points, as required to effectively assess a medical condition. Indeed, most known systems require contacting an acupressure point with the probe tip placed with a specific amount of pressure at a specific angle to obtain a reliable electrical measurement for assessment use. Measurement inaccuracies result from the failure to precisely locate the probe tip on the acupressure point and properly apply the appropriate rate and amount of pressure to the probe tip. Furthermore, if too much or too little pressure is applied to the point or if the pressure is applied too slowly or too quickly the measured values will either be false high or low. Learning the proper techniques to obtain accurate readings can take months and even then some may not ever be able to acquire the skill necessary to respectively obtain accurate readings. 
   Accordingly, what is needed is a method for accurately applying the appropriate rate and amount of pressure to the probe tip and locating a meridian or acupressure point. Thus, making the learning process much shorter and measurements that are less as subject to user error. 
   SUMMARY OF THE INVENTION 
   The present invention is a method for obtaining measured electrical values from a patient that correspond to a meridian or acupressure point. The present method contemplates locating with a probe a dermal area of a patient proximate a meridian. Such dermal area may be located by iteratively measuring and comparing the conductivity of a patient&#39;s skin until a significant level of conductance is indicated, thus suggesting the proximity of a meridian or acupressure point. An isolation hood at the end of the probe is then held in contact with the dermal area, and the probe tip is directed toward the skin by a motor actuated to obtain an electrical signal therefrom. The probe tip is specially designed with a motor and logic feedback loop to apply an appropriate amount of pressure to the dermal area to accurately measure the signal at a meridian. 
   An object of some embodiments of the present invention is to provide a method for obtaining a consistent and repeatable electrical signal from a dermal area corresponding to a meridian. Such signals are obtained by controlling the rate and amount of pressure applied to the probe tip. 
   Another object of some embodiments of the present invention is varying the rate and amount of pressure via a feed back loop that allows the rate and pressure to compensate for individual variances in skin thickness, moisture content, and such like. 
   A further object of some embodiments of the present invention is to provide a reliable method for obtaining an electrical signal from a patient that does not require implementation by an experienced or highly skilled professional. 
   Yet another object of some embodiments of the present invention is to provide a method for obtaining an electrical signal from a patient that enables fast and accurate results. 
   These and other features and advantages of the present invention will be set forth or will become more fully apparent in the description that follows and in the appended claims. The features and advantages may be realized and obtained by means of the instruments and combinations particularly pointed out in the appended claims. Furthermore, the features and advantages of the invention may be learned by the practice of the invention or will be obvious from the description, as set forth hereinafter. 

   
     BRIEF DESCRIPTION OF THE DRAWINGS 
     In order that the manner in which the above recited and other features and advantages of the present invention are obtained, a more particular description of the invention will be rendered by reference to specific embodiments thereof, which are illustrated in the appended drawings. Understanding that the drawings depict only typical embodiments of the present invention and are not, therefore, to be considered as limiting the scope of the invention, the present invention will be described and explained with additional specificity and detail through the use of the accompanying drawings in which: 
       FIG. 1  is a flow chart illustrating a method for obtaining an electrical signal from a patient in accordance with the present invention; 
       FIG. 2  is a detailed flow chart illustrating various steps that may be followed when locating a dermal area in accordance with the present invention; 
       FIG. 3  illustrates one embodiment of a point locator as disclosed herein; 
       FIG. 4  is a detailed flow chart illustrating various steps that may be followed when contacting a dermal area with a probe in accordance with the present invention; 
       FIGS. 5A-5C  illustrate a representative embodiment of a probe as disclosed herein; 
       FIG. 6  is a comparative graphical representation illustrating the efficiency and consistency of the present method (“Epic” in the legend) in obtaining an electrical signal compared to the prior art (“Duane” in the legend); 
       FIG. 7  is a point plot illustrating the consistency of electrical measurements obtained as a result of the present method 
       FIGS. 8-12  illustrate additional comparative graphical representations illustrating the efficiency and consistency of the present method (“Epic” in the legends) in obtaining an electrical signal compared to the prior art (“Manual” in the legends); 
       FIG. 13  illustrates a representative system that provides a suitable operating environment for use of electrical methods of the present invention; and 
       FIG. 14  is a flow chart that illustrates a representative embodiment for providing feedback in obtaining quick and repeatable electrical signals. 
   

   DETAILED DESCRIPTION OF THE INVENTION 
   The present invention may be embodied in other specific forms without departing from its spirit or essential characteristics. The described embodiments are to be considered in all respects only as illustrative and not restrictive. The scope of the invention is, therefore, indicated by the appended claims rather than by the foregoing description. All changes that come within the meaning and range of equivalency of the claims are to be embraced within their scope. 
   The following disclosure of the present invention is grouped into two subheadings, namely “Obtaining Quick and Repeatable Electrical Signals” and “Utilizing Electrical Feedback.” The utilization of the subheadings is for convenience of the reader only and is not to be construed as limiting in any sense. 
   Obtaining Quick and Repeatable Electrical Signals 
   The present invention relates to a method for obtaining electrical signals from a patient to assess a medical condition. In particular, the present invention relates to a method for accurately locating a meridian transdermally and obtaining a value for an electrical attribute corresponding to such a meridian. 
   As used in this specification, the term “meridian” refers to an electrical pathway or energy channel along the body, wherein each meridian contains at least one acupressure point corresponding to at least one organ or system within the body. The term “dermal area” refers to a portion of a patient&#39;s skin located near a meridian. The term “conductance” or “conductance value” refers to a rate of electrical potential initiated at one point and measured at a second point, wherein the second point corresponds to a dermal area. The term “meridian signal” refers to a reading or measurement detected or taken at a dermal area that indicates a conductance value and or a voltage potential and or another type of reading or signal that assesses a meridians condition. 
   Referring to  FIG. 1 , the method of the present invention may comprise first locating a dermal area corresponding to a meridian ( 2 ). A dermal area corresponding to a meridian may be approximated by analyzing a point location chart and then attempting to locate the same dermal area on a patient. This method, though available, is not preferred due to its subjectivity and potential for error. Alternatively, a meridian may be located by introducing an electrical signal at one point and measuring the resulting meridian signal at a second point to determine conductivity or resistivity. A dermal area corresponding to a meridian exhibits higher conductivity and, hence, lower resistivity, than adjacent, non-meridian containing dermal areas. A relatively high conductance value, or low resistance value, may then be used to more accurately isolate a dermal area corresponding to a meridian. This aspect of locating a dermal area corresponding to a meridian  2  is discussed in more detail with reference to  FIG. 2  below. 
   A second step of the present method may comprise contacting, with a probe, an appropriate dermal area  4 . Contacting an appropriate dermal area  4  entails approximating the location of a meridian, applying the probe to the skin in that area, checking the signal and comparing that signal to the original at a new location, and then stopping at the location with the best signal. Some embodiments have a sensor and logic to quickly locate the points that are closest to the meridian. After locating the meridian, the isolation hood is aligned with the meridian to ensure accurate readings of meridian signals corresponding thereto. Traditionally, application of pressure to and alignment of the probe have been highly subjective processes, with accurate results dependent primarily on the skill of the practitioner. Indeed, the historical lack of physical means for quantitative detection and evaluation of meridian characteristics has seriously limited their availability and application in medicine. As a result, one aspect of the present invention is directed to implementing a probe having physical qualities capable of objectively detecting and analyzing electrical signals corresponding to a meridian. This aspect of the present invention is discussed in more detail with reference to  FIGS. 5   a  and  5   b  below. 
   A third step of the present method may comprise obtaining a meridian signal from a probe  6  ( FIG. 5C ). An electrical signal may comprise a conductance value or a resistance value corresponding to the dermal area. Where a conductance value is obtained from a probe, a meridian may be located where the conductance value is significantly greater than an adjacent dermal area. On the other hand, where a resistance value is obtained, a resistive value significantly less than an adjacent dermal area may indicate a location of a meridian. 
   Referring now to  FIG. 2 , locating a dermal area corresponding to a meridian  2  entails positioning a point finder proximate a dermal area  8 . Positioning a probe proximate a dermal area  8  may comprise direct or indirect contact between a dermal area and a point finder. Indirect contact between a dermal area and a point finder may be achieved by, for example, applying a medium to the dermal area prior to contacting the area with a point finder to facilitate in hydrating the cornified layer of the epidermis without having to use the usual pressure required to accomplish this as is done during point reading. Alternatively, positioning a point finder proximate a dermal area  4  may comprise no contact whatsoever between the point finder and the dermal area, so long as the point finder may sense a meridian signal corresponding to the dermal area. 
   Second, locating a dermal area corresponding to a meridian  2  may comprise measuring an electrical signal corresponding to a dermal area  10  and comparing the measured signal to a previously received signal  12 . If a measured signal substantially differs from a previously received signal in a manner associated with locating a meridian, a point finder may provide an audible, visual or tactile indication  14 , or a combination of indications, to so indicate. For example, if a measured electrical signal is a conductance value that is substantially higher than a previously received conductance value, the point finder may produce an audible, visual, tactile or combination indication. Similarly, if a measured electrical value is a resistance value that is substantially less than a previously received resistance value corresponding to an adjacent dermal area, a point finder may so indicate. In this manner, a dermal area corresponding to a meridian may be isolated as a focus point for more precisely locating and evaluating a meridian. 
   Referring to  FIG. 2 ,  FIG. 4 , and  FIG. 5B , obtaining an electrical signal  6  entails stabilizing a probe against a patient&#39;s skin  30  by way of, for example, a stabilizing and isolating device attached to the probe, such as the isolation hood  40 . A stabilizing device may comprise prongs or a cylinder or other substantially rigid member coupled to or integrated with the probe such that the stabilizing device is maintained in a fixed position relative to a patient&#39;s skin. Another function of the stabilizing device is to isolate the manually affixed portion of the probe from the probe tip such so that a meridian signal is not influenced with unwanted input. 
   After measuring a conductance value corresponding to an amount of pressure  32  and iteratively comparing the measured conductance value to a previously obtained conductance value corresponding to a previously applied amount of pressure  34  to determine a relationship between the two conductance values, a motor is activated and the tip  42  descends through the isolation hood to apply more pressure. When the measured conductance value is substantially greater than the previously obtained conductance value, the amount of pressure corresponding to the measured conductance value may be maintained  36  and a meridian signal obtained there from  6 . 
   Referring to  FIGS. 5A and 5B  and  FIG. 6C , certain embodiments of the present methods may be achieved by providing, for example, a probe apparatus comprising a probe housing  38  having a probe tip  42  and an isolation hood  40 . The isolation hood  40  may comprise a cylinder coupled to or integrated with the probe housing  38  such that the isolation hood  40  is functionally discrete from the probe tip  42 . In this manner, pressure applied to the isolation hood  40  does not affect pressure applied to the probe tip  42 . In fact, the cylindrical structure of the isolation hood  40  allows the probe tip  42  to independently slide through the isolation hood  40 . The isolation hood  40  thus ensures that an electrical signal obtained by the probe tip  42  is objective and repeatable by preventing untoward manipulation of the probe apparatus to achieve a particular electrical signal.  
   A probe apparatus may further comprise a probe tip  42  and detector  44  coupled to an isolator  46  which is coupled to and insulated from the biasing element  48 , which is all enclosed in the probe housing  38 . One end of the biasing element  49  alone is coupled to the probe housing  38  while the Probe apparatus moves freely within the probe housing  38  and one part of the biasing element  49 . The Probe tip  42  is operably connected to a feedback loop  42 ,  44 ,  50 ,  110 ,  FIG. 14 and 49  which comprises, for example, hardware, electronics, firmware and software. A portion of the feedback loop  32 ,  34 ,  36  and shown in more detail in  FIG. 14  may compare a first detected meridian signal to a second detected meridian signal and compare the relationship between the first and second detected meridian signals to compute and adjust the input that drives the biasing element  48 . A biasing element  48  may comprise any mechanical, pneumatic, hydraulic, electrical or magnetic mechanism, or any other mechanism known to those in the art, by which to vary the pressure applied to a probe apparatus and ultimately to the probe tip  42 . The feedback loop may compute information received from meridian signals and adjusts the amount of pressure applied to the Probe tip  42  by the biasing element  48  accordingly. For example, if a measured conductance value corresponding to a present pressure is slightly greater than the previous measured conductance value received from a previous smaller pressure, then the feedback loop will evaluated such information and may actuate the biasing element to apply slightly more pressure to the Probe tip  42  to obtain a future conductance value. 
   The relationship of the change in meridian signal relative to the change in applied pressure is termed; the “sensitivity value”. The computer in the feedback loop will maintain this progressive process of incrementally driving the biasing element  48  with slightly more pressure as long as the sensitivity values are roughly linear  61  ( FIG. 6 ). If, however, the feedback loop senses a definite change in the slope of the sensitivity values  60  then the feedback loop may determine to intelligently moderate  68  the pressure applied to the Probe tip  42  so that the slope of the sensitivity values may become relatively horizontal  69 . 
   The probe apparatus may comprise an automatic reset initiated after the feedback loop has determined the reading cycle is complete, thus preparing it for its next reading. This process may consist of an automated sequence of events including: retracting the Probe tip  42 , holding it in its retracted position so that the probe tip  42  is no longer in contact with the skin for an adjustable amount of time, extend the detector  44 , and holding the detector in its extended position with an adjustable amount of pressure until the feedback loop influences it otherwise. 
   The probe apparatus may also comprise an automatic reading initiator. This initiator may be triggered when the feedback loop senses a feedback signal. The feedback signal may be a conductance value greater than 0. This initiator may be comprised of an automated sequence of events including: retracting the Probe tip  42 , extending the tip with a small and adjustable amount of pressure, and beginning meridian reading process. 
   The probe apparatus my also be comprises of an acupressure point finding mode. This mode is initiated when the probe switch  52  is depressed and held down and the probe may stay in this mode until probe switch  52  is released. This mode may be comprised of a sequence of events and or actions including: extending the Probe tip and holding it in its extended position with an adjustable amount of pressure, providing meridian reading sot the feedback loop, audible, visual, and tactile indicators that vary based on the strength of the meridian signal. The motive of the indicators is to aid the practitioner in positioning the probe tip  42  over and aligning the probe tip  42  with an acupressure point. 
   Referring now to  FIGS. 6 and 7 , utilizing the present method to obtain an electrical signal is both more efficient and more precise than prior art methods. Indeed, prior art methods  62  rely on trial and error in both locating the general dermal area corresponding to a meridian and in applying pressure to such dermal area to obtain an appropriate meridian reading. These methods require considerable time, as evidenced by the prior art rate curve  62 , where an accurate electrical signal  70  is obtained considerably later than the same signal obtained through implementation of the present method  68 , as illustrated by the present method&#39;s rate curve  60 . As may be seen, a rise time  61  for the present method&#39;s rate curve  60  is consistently high and fast, while the prior art rate curve initially has a fast rise time  61  followed by a slower rise time  62 . Also, for the present method&#39;s rate curve  60 , an accurate signal  69  is therefore obtained earlier at point  68  and is easily maintained. Further, the present method obtains an electrical signal with far greater precision than prior art methods. This point is emphasized with reference to  FIG. 7 , where readings obtained through implementation of the present method  60  fall within an extremely small range, with two outliers  74  only moderately displaced from the major cluster of readings  72 . 
   Referring now to  FIGS. 8-12 , additional comparative graphical representations illustrating the efficiency and consistency of the present method in obtaining an electrical signal compared to the prior art. In  FIGS. 8-12 , curves  80 ,  90 ,  100 ,  110  and  120  respectively illustrate the results of utilizing an embodiment of the present invention and are compared to results of using a prior art technique. Those skilled in the art will appreciate that in each instance, the results of utilizing an embodiment of the present invention include an increased incline and quicker leveling effect of the curve. 
   Utilizing Electrical Feedback 
   As provided above, the present invention relates to a method for obtaining electrical signals from a patient to assess a medical condition. In particular, the present invention relates to a method for accurately locating a meridian transdermally and obtaining a value for an electrical attribute corresponding to such a meridian. 
   In accordance with at least some embodiments of the present invention, electrical feedback is utilized to obtain quick and repeatable electrical signals in accordance with the present invention. In at least some embodiments, a computer device may be utilized in providing the electrical feedback. Accordingly,  FIG. 13  and the corresponding discussion are intended to provide a general description of a suitable operating environment in which the invention may be implemented. One skilled in the art will appreciate that the invention may be practiced in a variety of system configurations. 
   Embodiments of the present invention embrace one or more computer readable media, wherein each medium may be configured to include or includes thereon data or computer executable instructions for manipulating data. The computer executable instructions include data structures, objects, programs, routines, or other program modules that may be accessed by a processing system, such as one associated with a general-purpose computer capable of performing various different functions or one associated with a special-purpose computer capable of performing a limited number of functions. Computer executable instructions cause the processing system to perform a particular function or group of functions and are examples of program code means for implementing steps for methods disclosed herein. Furthermore, a particular sequence of the executable instructions provides an example of corresponding acts that may be used to implement such steps. Examples of computer readable media include random-access memory (“RAM”), read-only memory (“ROM”), programmable read-only memory (“PROM”), erasable programmable read-only memory (“EPROM”), electrically erasable programmable read-only memory (“EEPROM”), compact disk read-only memory (“CD-ROM”), or any other device or component that is capable of providing data or executable instructions that may be accessed by a processing system. 
   With reference to  FIG. 13 , a representative system for implementing the invention includes computer device  130 , which may be a general-purpose or special-purpose computer. For example, computer device  130  may be a personal computer, a notebook computer, a personal digital assistant (“PDA”) or other hand-held device, a workstation, a minicomputer, a mainframe, a supercomputer, a multi-processor system, a network computer, a processor-based consumer electronic device, or the like. 
   Computer device  130  includes system bus  132 , which may be configured to connect various components thereof and enables data to be exchanged between two or more components. System bus  132  may include one of a variety of bus structures including a memory bus or memory controller, a peripheral bus, or a local bus that uses any of a variety of bus architectures. Typical components connected by system bus  132  include processing system  134  and memory  136 . Other components may include one or more mass storage device interfaces  138 , input interfaces  140 , output interfaces  142 , and/or network interfaces  144 , each of which will be discussed below. 
   Processing system  134  includes one or more processors, such as a central processor and optionally one or more other processors designed to perform a particular function or task. It is typically processing system  134  that executes the instructions provided on computer readable media, such as on memory  136 , a magnetic hard disk, a removable magnetic disk, a magnetic cassette, an optical disk, or from a communication connection, which may also be viewed as a computer readable medium. 
   Memory  136  includes one or more computer readable media that may be configured to include or includes thereon data or instructions for manipulating data, and may be accessed by processing system  134  through system bus  132 . Memory  136  may include, for example, ROM  148 , used to permanently store information, and/or RAM  150 , used to temporarily store information. ROM  148  may include a basic input/output system (“BIOS”) having one or more routines that are used to establish communication, such as during start-up of computer device  130 . RAM  150  may include one or more program modules, such as one or more operating systems, application programs, and/or program data. 
   One or more mass storage device interfaces  138  may be used to connect one or more mass storage devices  146  to system bus  132 . The mass storage devices  146  may be incorporated into or may be peripheral to computer device  130  and allow computer device  130  to retain large amounts of data. Optionally, one or more of the mass storage devices  146  may be removable from computer device  132 . Examples of mass storage devices include hard disk drives, magnetic disk drives, tape drives and optical disk drives. A mass storage device  146  may read from and/or write to a magnetic hard disk, a removable magnetic disk, a magnetic cassette, an optical disk, or another computer readable medium. Mass storage devices  146  and their corresponding computer readable media provide nonvolatile storage of data and/or executable instructions that may include one or more program modules such as an operating system, one or more application programs, other program modules, or program data. Such executable instructions are examples of program code means for implementing steps for methods disclosed herein. 
   One or more input interfaces  140  may be employed to enable a user to enter data and/or instructions to computer device  130  through one or more corresponding input devices  152 . Examples of such input devices include a keyboard and alternate input devices, such as a mouse, trackball, light pen, stylus, or other pointing device, a microphone, a joystick, a game pad, a satellite dish, a scanner, a camcorder, a digital camera, and the like. Similarly, examples of input interfaces  140  that may be used to connect the input devices  152  to the system bus  132  include a serial port, a parallel port, a game port, a universal serial bus (“USB”), a firewire (IEEE 1394), or another interface. 
   One or more output interfaces  142  may be employed to connect one or more corresponding output devices  154  to system bus  132 . Examples of output devices include a monitor or display screen, a speaker, a printer, and the like. A particular output device  154  may be integrated with or peripheral to computer device  130 . Examples of output interfaces include a video adapter, an audio adapter, a parallel port, and the like. 
   One or more network interfaces  144  enable computer device  130  to exchange information with one or more other local or remote computer devices, illustrated as computer devices  156 , via a network  158  that may include hardwired and/or wireless links. Examples of network interfaces include a network adapter for connection to a local area network (“LAN”) or a modem, wireless link, or other adapter for connection to a wide area network (“WAN”), such as the Internet. The network interface  144  may be incorporated with or peripheral to computer device  130 . In a networked system, accessible program modules or portions thereof may be stored in a remote memory storage device. Furthermore, in a networked system computer device  130  may participate in a distributed computing environment, where functions or tasks are performed by a plurality of networked computer devices. 
   With reference now to  FIG. 14 , a flow chart is provided that illustrates a representative embodiment for providing feedback in obtaining quick and repeatable electrical signals. In accordance with at least some embodiments of the present invention, a feedback loop is used to enable the decision on when to stop applying pressure. In accordance with embodiments of the present invention, the rate that the motor is applying pressure is not changed based on the readings. Rather, the pressure stays constant regardless of the readings until the point is reached to not apply any more pressure. And, the electrical feedback loop feeds the decision on when to stop applying pressure.  FIG. 14  is a representative embodiment for such methods. In  FIG. 14 , execution begins at decision block  160  for a determination as to whether or not a reading value of greater than zero is received. 
   Thus, as discussed herein, the embodiments of the present invention embraces a method for obtaining electrical signals from a patient to assess a medical condition. In particular, the present invention relates to a method for accurately locating a meridian transdermally and obtaining a value for an electrical attribute corresponding to such a meridian. The present invention may be embodied in other specific forms without departing from its spirit or essential characteristics. The described embodiments are to be considered in all respects only as illustrative and not restrictive. The scope of the invention is, therefore, indicated by the appended claims rather than by the foregoing description. All changes that come within the meaning and range of equivalency of the claims are to be embraced within their scope.