the configuration of an information element for an oximeter sensor and method of reading an information element with an attached oximeter is described in u . s . pat . no . 5 , 758 , 644 , assigned to the assignee of the current application , and incorporated by reference herein . accordingly , the configuration and the implementation of an information element will be greatly summarized as follows . fig1 illustrates a conventional oximeter sensor circuit 100 . the oximeter sensor circuit 100 includes an emitter 105 comprising a first led 107 and a second led 110 . the oximeter sensor circuit further includes an information element comprising a resistor 115 . the first led 107 , the second led 110 and the resistor 115 are connected in parallel . the parallel connection has a common input electrical connection 120 and a common return 125 . the oximeter sensor circuit 100 also includes a photodetector 130 having an input electrical connection 135 connected to one end and having the common return 125 connected to the other end . as mentioned , the resistor 115 is provided as an information element that can be read by an attached oximeter . in order to read the resistor 115 , the oximeter drives the oximeter sensor circuit 100 at a level where the emitter 105 draws effectively insignificant current . as is well understood in the art , the emitter 105 becomes active only if driven at a voltage above a threshold level . thus , at this low level , significantly all of the current through the input electrical connection 120 flows through the resistor 115 . by reducing the drive voltage across the input electrical connection 120 and common return 125 to a low enough level to not activate the emitter 105 , the emitter 105 is effectively removed from the oximeter sensor circuit 100 . thus , the oximeter can determine the value of the resistor 115 . the value of the resistor 115 can be preselected to indicate , for example , the type of sensor ( e . g ., adult , pediatric , or neonatal ), the operating wavelength , or other parameters about the sensor . the resistor 115 may also be utilized for security and quality control purposes . for example , the resistor 115 may be used to ensure that the oximeter sensor circuit 100 is configured properly for a given oximeter . for instance , the resistor 115 may be utilized to indicate that the oximeter sensor circuit 100 is from an authorized supplier . an information element other than the resistor 115 may also be utilized . the information element need not be a passive device . coding information may also be provided through an active circuit , such as a transistor network , memory chip , or other identification device . furthermore , it will be understood by a skilled artisan that a number of different circuit configurations can be implemented that allow the oximeter sensor circuit 100 to include an information element . for example , the emitter 105 and the information element may each have individual electrical connections . as mentioned above , the resistor 115 is preselected such that at low drive voltages , it is the only circuit element sensed by the oximeter . on the other hand , the resistor 115 can also be preselected be of a sufficiently high value that when the drive voltage rises to a level sufficient to drive the emitter 105 , the resistor 115 is effectively removed from the oximeter sensor circuit 100 . thus , the resistor 115 does not affect normal operations of the emitter 105 . in summary , an information element may form an integral part of the oximeter sensor circuit 100 by providing valuable information to the attached oximeter . fig2 a and 2b illustrate a conventional disposable sensor 200 . the disposable sensor 200 includes an adhesive substrate 205 having an elongated center portion 210 with front and rear flaps , 215 and 220 , extending outward from the elongated center portion 210 . the adhesive substrate 205 may also have an image 225 superimposed on the adhesive substrate 205 so as to indicate proper use . the elongated center portion 210 includes the oximeter sensor circuit 100 of fig1 . for example , the emitter 105 is housed on an underside of the elongated center portion 210 approximately beneath the superimposed image 225 . thus , as shown in fig2 a , the emitter 105 may be housed approximately beneath the asterisk superimposed on the image of a fingernail . on the other hand , the photodetector 130 is housed on the topside of the elongated center portion 210 in proximity with the rear flaps 220 . the elongated center portion 210 further includes an electrical connector 230 to drive the emitter 105 and to receive an output from the photodetector 130 . the electrical connector 230 is preferably configured to attach to a connector cable 235 via a sensor connector 240 . also , the connector cable 235 attaches to or connects with an oximeter via an oximeter connector 245 . fig2 b illustrates an example of how the disposable sensor 200 wraps the front and rear flaps 215 and 220 around a finger such that the adhesive substrate 205 provides a secure contact between the patient &# 39 ; s skin , the emitter 105 and the photodetector 130 . fig2 b also illustrates an example of the sensor connector 240 ( shown in broken lines ) encompassing the electrical connector 230 . as shown in fig1 - 2b , the conventional disposable sensor 200 integrates the components of the conventional oximeter sensor circuit 100 such that disposal of the disposable sensor 200 includes disposal of the longer lasting , expensive circuitry found therein . fig3 illustrates an exploded view of one embodiment of a resposable ( reusable / disposable ) sensor 300 according to the present invention . in this embodiment , the resposable sensor 300 includes a reusable portion 305 having an emitter 306 , a photodetector 307 and an electrical connector 308 . the resposable sensor also includes a disposable portion 310 having a face tape layer 315 and a clear base tape layer 320 . as shown in fig3 , the disposable portion 310 attaches to the reusable portion 305 by sandwiching the reusable portion 305 between a face tape layer 315 and a clear base tape layer 320 . according to this embodiment , conventional adhesives or other attaching methodology may be used to removably attach the face tape layer 315 to the clear base tape layer 320 . furthermore , the adhesive properties associated with the base of the conventional disposable sensor 200 may be the same as the adhesive properties on the base of the clear base tape layer 320 , as both portions are provided to attach to the patient &# 39 ; s skin . as mentioned , the disposable portion 310 removably attaches to the reusable portion 305 in , for example , a sandwich or layered style . after removably attaching the disposable portion 310 to the reusable portion 305 , the resposable sensor 300 functions similar to the disposable sensor 200 , i . e ., the resposable sensor 300 wraps flaps around a patient &# 39 ; s tissue such that the emitter 306 and the photodetector 307 align on opposite sides of the tissue . however , in contrast to the disposable sensor 200 , the resposable sensor 300 provides for reuse of the reusable portion 305 . for example , when the disposable portion 310 becomes contaminated , worn , or defective , rather than discarding the entire resposable sensor 300 , the disposable portion 310 is removed such that the reusable portion 305 may be re - removably attached to a new disposable portion 310 . the discarding of the disposable portion 310 completely avoids cross - contamination through the reuse of adhesive tapes between patients without wasting the more costly and longer lasting sensor circuitry of the resposable portion 305 . note that optional sterilization procedures may be advantageously performed on the reusable portion 305 before reattachment to either the new disposable portion 310 or to the patient , in order to further ensure patient safety . fig4 illustrates a top view of an embodiment of the face tape layer 315 of the disposable portion 310 of the resposable sensor 300 . according to this embodiment , the face tape layer 315 further includes an information element 405 as an integral part of the face tape layer 315 . in this embodiment , the information element 405 is a resistive element made by depositing a conductive ink trace having a predetermined length and width . as is known in the art , the length , width and conductivity of the conductive ink trace determines the resistance of the resistive element . the information element 405 is deposited between contacts 410 that are also implemented with conductive ink . it will be understood by a skilled artisan that a variety of methods can be used for mating the contacts 410 with the electrical circuitry of the reusable portion 305 . for example , the contacts 410 may advantageously physically touch the leads or the electrical connector 308 such that the reusable portion 305 is electrically configured to include the information element 405 . such a configuration employs the oximeter sensor circuit 100 of fig1 , having elements thereof distributed in both the reusable portion 305 and the disposable portion 310 of the resposable sensor 300 . in the foregoing embodiment , the disposable portion 310 comprises the information element 405 along with the face tape layer 315 and the clear base layer 320 . as mentioned , the disposable portion 310 is removably attached to the reusable portion 305 and is employed in a similar manner as the disposable sensor 200 . in contrast to the disposable sensor 200 , when the disposable portion 310 of the resposable sensor 300 becomes worn , the disposable portion 310 and the information element 405 are discarded and the reusable portion 305 is saved . by discarding the information element , the attached oximeter can perform quality control . for example , if the reusable portion 305 is reattached to a patient using either a simple adhesive or any other non - authorized disposable mechanism , the resposable sensor 300 will not include the information element 405 . as mentioned above , an attached oximeter can recognize the absence of the information element 405 and create an appropriate response indicating inappropriate use of the reusable portion 305 of the resposable sensor 300 . fig5 illustrates a top view of yet another embodiment of the face tape layer 315 of the disposable portion 310 of the resposable sensor 300 . in this embodiment , the face tape layer 315 includes a breakable conductor 505 comprising a conductive ink trace located approximately along the periphery of the face tape layer 315 . this location ensures that a tear along the periphery of the face tape layer 315 results in a tear , or electrical discontinuity , in the breakable conductor 505 . for example , fig6 a and 6b illustrate the face tape layer 315 in which the breakable conductor 505 is layered between a tape stock 605 and a tape base 610 . the reusable portion 305 of the resposable sensor 300 then attaches to the tape base 610 through a pressure sensitive adhesive ( psa ) 615 . the psa 615 , the conductor 505 and the tape base 610 include a score 620 such that multiple attachment and removal of the resposable sensor 300 will result in a peripheral tear , or electrical discontinuity , in the breakable conductor 505 , as illustrated in fig6 b . thus , like the information element 405 , the breakable conductor 505 also provides security and quality control functions . in particular , repeated use of the disposable portion 305 of the resposable sensor 300 advantageously severs at least one part of the breakable conductor 505 . an attached oximeter can detect such severance and initiate an appropriate notification to , for example , monitoring medical personnel . providing security and quality control through a breakable conductor advantageously assists in controlling problems with patient contamination or improper attachment due to weakened adhesives . fig7 illustrates yet another embodiment of the face tape layer 315 . in this embodiment , the face tape layer 315 combines the breakable conductor 505 and the information element 405 . in this embodiment , the breakable conductor 505 is printed in a serpentine pattern to further increase the probability of a discontinuity upon the tearing of any portion of the face tape layer 315 . this combination of the information element 405 and the breakable conductor 505 advantageously adds significant safety features . for example , in this embodiment , the information element 405 is connected serially with the breakable conductor 505 and in parallel with the emitter 306 of the reusable portion 305 . therefore , any discontinuity or tear in the breakable conductor 505 separates the information element 405 from the circuitry of the reusable portion 305 . according to the foregoing embodiment , the attached oximeter receives an indication of both overuse and misuse of the resposable sensor 300 . for example , overuse is detected through the tearing and breaking of the breakable conductor 505 , thereby removing the information element 405 from the resposable sensor 300 circuitry . in addition , misuse through employment of disposable portions 310 from unauthorized vendors is detected through the absence of the information element 405 . moreover , misuse from purposeful shorting of the contacts 410 is detected by effectively removing the emitter 306 from the circuit , thereby rendering the resposable sensor 300 inoperative . therefore , the resposable sensor 300 of this embodiment advantageously provides a multitude of problem indicators to the attached oximeter . by doing so , the resposable sensor 300 advantageously prevents the likelihood of contamination , adhesive failure , and misuse . the resposable sensor 300 also advantageously maintains the likelihood of quality control . a skilled artisan will recognize that the concepts of fig3 - 7 may be combined in total or in part in a wide variety of devices . for example , either or both of the breakable conductor 505 and the information element 405 may advantageously be traced into the clear base tape layer 320 rather than into the face tape layer 315 . fig8 a and 8b illustrate yet another embodiment of the disposable portion 310 of the resposable sensor 300 according to the present invention . as shown in this embodiment , the disposable portion 310 includes a face tape layer 805 and a clear base tape layer 810 . according to this embodiment , the clear base tape layer 810 includes a preattached section 815 and a fold over section 820 . the preattached section 815 attaches approximately one third of the face tape layer 805 to the clear base tape layer 810 . on the other hand , the fold over section 820 forms a flap configured to create a cavity between the face tape layer 805 and the clear base tape layer 810 . the cavity is configured to receive the reusable portion 305 of the resposable sensor 300 . according to one embodiment , a release liner 825 fills the cavity and separates the face tape layer 805 from the clear base tape layer 810 . when the release liner 825 is removed , newly exposed adhesive on the fold over section 820 and the face tape layer 805 removably attaches the reusable portion 305 between the face tape layer 805 and fold over section 820 of the clear base tape layer 810 . according to another embodiment , the cavity is so formed that adhesive is not needed . for example , the fold over section 820 may comprise resilient material that can form a friction fit relationship so as to fix the reusable portion 305 in an appropriate position relative to the disposable portion 310 . on the other hand , the fold over section 820 may also comprise material having other than resilient or adhesive properties , but still allow for proper placement of the reusable portion 305 and disposable portion 310 on the patient . for example , hook - and - loop type materials like velcro ® may be used . it will be understood that a skilled artisan would recognize that the fold over embodiment of the responsible sensor 300 may employ the properties discussed in relation to fig3 - 7 , such as the information element 405 and the breakable wire 505 . fig9 a illustrates an embodiment of a resposable sensor 900 integrated with an attached patient cable 905 , according to another embodiment of the invention . in this embodiment , a disposable portion 910 is attached to a reusable portion 915 by removably inserting the reusable portion 915 into a tape envelope 920 formed in the disposable portion 910 . a skilled artisan will recognize that the disposable portion 910 may include the information element 405 , the breakable wire 505 , or both . inclusion of one or both of these electronic components in the resposable sensor 900 advantageously provides the security , quality control , and safety features described in the foregoing embodiments . fig9 b illustrates an embodiment of a resposable sensor 300 of fig3 , according to another embodiment of the invention . according to this embodiment , the resposable sensor 300 removably attaches to the patient cable 905 via a sensor connector 925 . the patient cable 905 then attaches to an oximeter via an oximeter connector 930 . use of the sensor connector 925 enables the replacement of both the reusable portion 305 of the resposable sensor 300 without replacement of the sensor connector 925 or patient cable 905 . in such an embodiment , the disposable portion 310 would follow a different , more frequent , replacement schedule than that of the reusable portion 305 . a skilled artisan will recognize that the variety of configurations described above that include the information element 405 , the breakable wire 505 , or both , may be incorporated into the embodiment of fig9 b . although the foregoing invention has been described in terms of certain preferred embodiments , other embodiments will be apparent to those of ordinary skill in the art . for example , select aspects of fig3 - 9b may be combined . for example , the envelope configured disposable portion 910 of fig9 a may be combined with the reusable portion 305 of fig3 . additionally , other combinations , omissions , substitutions and modifications will be apparent to the skilled artisan in view of the disclosure herein . accordingly , the present invention is not intended to be limited by the reaction of the preferred embodiments , but is to be defined by reference to the appended claims .
a pulse oximeter sensor has both a reusable and a disposable portion . the reusable portion of the sensor preserves the relatively long - lived and costly emitter , detector and connector components . the disposable portion of the sensor is the relatively inexpensive adhesive tape component that is used to secure the sensor to a measurement site , typically a patient &# 39 ; s finger or toe . the disposable portion of the sensor is removably attached to the reusable portion in a manner that allows the disposable portion to be readily replaced when the adhesive is expended or the tape becomes soiled or excessively worn . the disposable portion may also contain an information element useful for sensor identification or for security purposes to insure patient safety .