with reference to fig1 - 4 , an oximeter 2 is shown . in particular , oximeter 2 is shown to have a display screen 4 for displaying graphical or numerical representations of physical attributes that are measured or sensed from a patient . in the exemplar led display screen of fig1 , a number “ 98 ” represents the spo 2 while the number “ 80 ” represents the pulse rate of the patient . also shown on screen 4 is a first bar 6 of increasing widths that indicates the strength of the signal being measured , and an adjacent bar 8 that indicates the perfusion index of the patient . in most instances , the bar for the perfusion index ( pi ) remains relatively constant , while the bar graph 6 for the strength of the signal varies . there are other graphical representations shown on screen 4 . for example , an electrical outlet is shown to indicate whether the device is connected to an ac power source , and a battery symbol provides an indication of the amount of power that remains when oximeter 2 is not connected to ac power . the operation of the exemplar oximeter of fig1 - 4 may rely on the bci micro power oximeter board , catalog no . 31392b1 , or the bci digital micro power oximeter board , catalog no . ww3711 . as these oximeter boards and the operation of an oximeter assembled with those boards are conventional , specific operations of the oximeter are deemed not to be necessary for this application . further , the oximeter may incorporate the features disclosed in co - pending u . s . patent application ser . nos . 11 / 907 , 980 , 11 / 907 , 981 , 11 / 907982 , 11 / 907 , 983 and 12 / 285 , 663 . the respective disclosures of the just noted co - pending applications are incorporated by reference to this application . for the embodiment of the instant inventive oximeter , it is suffice to note that an on / off switch 10 , when pressed , initiates the operation of the oximeter . the housing of oximeter 2 is designated 12 . housing 12 is configured to have a front side or surface 14 per shown in fig1 , a back side 16 per shown in fig2 , a left side 18 ( when viewed from the front ) per shown in fig3 , and a left side 19 per shown in fig4 . the back side 16 of oximeter 2 has a number of formations , including a back wall 18 , a battery or power pack cover 20 and a raised compartment portion 22 . back wall 18 has two sidewalls 24 a and 24 b ( see also fig1 ) that extend from back wall 18 . the sidewalls 24 a and 24 b extend longitudinally downwards , with respect to the oximeter housing as shown in fig2 , and joined to form a base 26 , which is shown to be semi - circular . with back wall 18 , sidewalls 24 a and 24 b , and base 26 , a void or cavity 28 is defined at the back of housing 12 . a boss or protuberance 30 is formed at the lower portion of back wall 18 adjacent to base 26 . protuberance 30 is used as a latch mechanism , to be further discussed infra . by means of a force applied to thumb pad 30 , battery cover 20 is removable from the back of housing 12 . this is more clearly shown in fig2 which shows a latch 32 that disengages with a catch 34 when thumb pad 30 is pressed downward , thereby enabling cover 20 to be removed from the back of housing 12 to expose a chamber 38 . further with reference to fig2 , a battery pack 36 that contains the power source for the oximeter , which ordinarily is fitted to chamber 38 , is shown to have been removed therefrom . further with respect to the disassembled view of fig2 , note that the battery pack 36 supplies power to the oximeter by way of the battery contacts 40 . in place of battery pack 36 , a plurality of batteries , for example four batteries as indicated by the battery outlines drawn on the back wall of chamber 38 , may be used to power the oximeter . fig5 a - 5 d , 6 a - 6 d , 7 a - 7 b and 8 a - 8 c respectively illustrate the different sensor assemblies that may be used with oximeter 2 for measuring or sensing the physical attributes of a patient . the finger sensor assembly shown in fig5 a - 5 d has a large adult size finger sensor 42 connected by a cable 44 to a connector 46 . sensor 42 has a base portion 42 a and a movable portion 42 b that pivots relative to base portion 42 a when a patient inserts a digit , for example a finger , in the direction as indicated by directional arrow 48 , for grasping the finger of the patient . connector 46 is a conventional db - 9 connector , per clearly shown in fig5 d . as shown in fig5 b , connector 46 ordinarily has a grab tab 46 a that extends longitudinally from connector 46 . grab tab 46 a usually is held by the user for mating or removing connector 46 to or from the input connector 50 ( fig1 ) of oximeter 2 . to facilitate the mating and removal of connector 46 to and from the input connector 50 , in this instance the female connector of the oximeter , grab tab 46 a may be formed at a right angle to connector 46 , per shown by the dashed line grab tab 46 b of fig5 a . the sensor 42 shown in fig5 a - 5 d may be the adult finger sensor manufactured by the assignee of the instant invention under manufacturing no . 3044 . fig6 a - 6 d show a second sensor assembly that has a sensor 52 having a smaller dimension than sensor 42 of fig5 a - 5 d . elements for the fig6 a - 6 d sensor assembly that are the same as the fig5 a - 5 d sensor assembly are labeled the same . sensor 52 of the fig6 a - 6 d sensor assembly is made up of two portions 52 a and 52 b that are pivotable relative to each other , when their respective finger grip tabs 52 a ′ and 52 b ′ are pressed towards each other . sensor 52 may be represented by the sensor manufactured by the assignee of the instant invention under manufacturing no . 3444 . fig7 illustrates a pediatric or neonate finger sensor assembly having a sensor 54 that has a dimension smaller than either of the sensors shown in fig5 and 6 . sensor 54 has two portions 54 a and 54 b that are pivotally connected at pivot 56 and both portions may be pivotally opened to receive a digit of a child from the direction indicated by directional arrow 48 . fig8 a - 8 c illustrate yet another sensor assembly that is matable to oximeter 2 for measuring the physical attributes of a patient . for the fig8 a - 8 c sensor assembly , the sensor 56 is shown to be connected to connector 46 by a coiled cable 58 . sensor 56 is similar to sensor 42 of the fig5 a - 5 d sensor assembly in that portion 56 a is pivotable relative to base 56 b . similarly , connector 46 has its grab tab 46 b at right angle to the connector per shown in fig8 a , to facilitate the mating and withdrawal of the male connector 46 from the input female connector 50 of oximeter 2 . as shown in fig8 a and 8 b , coiled cable 58 has a coiled portion 58 a that is formed from a series from helical coils so that the length of cable 58 may be extended . when not in use , cable 58 is contracted to its original state per shown in fig8 a and 8 b . with coiled portion 58 a , longitudinal tension exerted on cable 58 is absorbed . moreover , cable 58 may not be twisted as much as a non - coiled cable such as cable 44 shown for the other sensor assemblies of fig5 , 6 and 7 . tension relief sections 58 b and 58 c are provided at the sensor end and the connector end , respectively , of cable 58 . such tension relief portions are similarly provided for the two ends of cable 44 for the earlier discussed sensor assemblies of fig5 - 7 . although cable 58 has coiled portion 58 a along a major portion thereof , fig8 a and 8 b show that cable 58 becomes straightened at both of its ends for connection to relief portions 58 b and 58 c . it should be appreciated however that the coiled portion 58 a may in practice extend uninterrupted between tension relief sections 58 b and 58 c . alternatively , coiled portion 58 a may occupy a shorter length of or be interrupted multiple coiled sections along the cable 58 of the sensor assembly of fig8 a - 8 b . as is with the other sensors that sense the parameters that correspond to the spo 2 of a patient , sensor 56 of the sensor assembly of fig8 a - 8 b may be referred to as a spectrophotometric sensor . as is well known , sensor 56 has at least one light emitting diode at one portion , and a photosensor at the other portion for measuring the spo 2 of the patient so that the sensor of a sensor assembly is not left hanging , housing 12 of oximeter 2 has configured at its back cavity 28 . as was discussed previously , cavity 28 is defined by back wall 18 , sidewalls 24 a and 24 b , and base 26 . as cavity 28 has a defined configuration and the various sensors have different dimensions , a means must be devised to enable the various dimensioned sensors to be retained at housing 12 . to achieve this end , a receptacle cover , holster or clip 60 having a configured dimension is removably attached or affixed to the portion of the housing that defines cavity 28 to form a receptacle , holster or pocket of a particular dimension that is adapted to retain a correspondingly dimensioned sensor . fig9 shows a receptacle cover 60 in alignment with cavity 28 and a sensor , for example sensor 52 of the sensor assembly of fig6 . receptacle cover 60 is slidably fitted to cavity 28 to form a receptacle for retaining the sensor placed or deposited thereinto . three different receptacle cover embodiments are shown in fig1 a - 10 g , fig1 a - 11 g and fig1 a - 12 g . as the distance separating sidewalls 24 a and 24 b that define cavity 28 is constant at the back of oximeter housing 12 , to attach the receptacle cover to the cavity defining portion of housing 12 , each of the receptacle covers has a width defined by its sidewalls that is slightly smaller than the distance separating sidewalls 24 a and 24 b . thus , it is the depth of the receptacle , i . e ., the distance between the back wall 18 of cavity 28 and the front wall of the receptacle cover that determines the dimension for the different receptacles . in fig1 a - 10 g , a first receptacle cover 60 a is shown to have two sidewalls 62 a and 62 b . these sidewalls extend from a front wall 64 . the sidewalls 62 a and 62 b each extend longitudinally at one end to merge and form a curved end insert 66 that has one edge 66 a . the respective longitudinal edges of sidewalls 62 a and 62 b are formed to have corresponding flanges 68 a and 68 b . front wall 64 extends longitudinally only to approximately the respective ends of the sidewalls 62 a and 62 b that form the beginning of end insert 66 , which resembles a half ring , per shown in fig1 d and 10 e . fig1 d and 10 e show the width of the receptacle cover 60 a as “ w ”. the depth of the receptacle cover 60 a is designated d 1 , per shown in fig1 c . receptacle cover 60 a has at its front wall 64 a prong or tongue that biases inwardly in the direction indicated by directional arrow 72 , as shown in fig1 f and 10 g . also shown on the front wall 64 of receptacle 60 a are three numbers , with the “ 3 ” being circled , per indicated by designation 74 in fig1 e . the circled number provides an indication of the size of the receptacle cover for use with a corresponding sensor . combining with cavity 23 at the housing 12 of the oximeter for accommodating that fits into the receptacle . for the exemplar embodiment of the receptacle cover 60 a , the circled 3 provides an indication that the it is to be used with an adult sensor , for example the adult sensor of the sensor assembly shown in fig5 a - 5 d . the same components for the receptacle cover embodiments shown in fig1 a - 11 g and fig1 a - 12 g as those for the receptacle cover embodiment of fig1 a - 10 g are labeled the same . as was discussed above , the major difference between the different receptacle covers is the distance from the front wall to the edge of the two sidewalls extending therefrom , i . e ., the distance separating the back wall 18 of the oximeter housing 12 and the front wall 64 of the cover when the cover is affixed to the oximeter housing . for identification purposes , the receptacle cover shown in fig1 a - 11 g is designated 60 b and the distance from its front wall 64 to the respective longitudinal edges of its two sidewalls 62 a and 62 b is designated d 2 , per shown in fig1 c . similarly , the designation d 3 is provided to indicate the depth of the receptacle cover 60 c shown in fig1 a - 12 g . the width “ w ” for the three different receptacle embodiments shown in fig1 , 11 and 12 remain the same , per shown in fig1 e , 11 e and 12 e . the receptacle cover shown in fig1 a - 10 g is the largest receptacle cover and is identified as such per the number “ 3 ”, designated by 74 a in fig1 e . the receptacle cover 60 b shown in fig1 has a small dimension and is identified by the circled number “ 2 ”, per designated 74 b in fig1 e . the smallest of the three receptacle covers shown in fig1 has the circled number “ 1 ”, per designated 74 c in fig1 e . as all of the components of the receptacle cover 60 b shown in fig1 a - 11 g are the same as those in fig1 - 10 g , no further discussion is required . the same is true with respect to the receptacle cover 60 c shown in fig1 a - 12 g , except for the two internal alignment flanges 76 a and 76 b that are shown in fig1 d . these internal flanges are used to provide guidance for the positioning of sensor 54 for the pediatric sensor assembly as shown in fig7 . sensor 54 , as it is used for a child , is smaller than either of the sensors 42 and 52 of the sensor assemblies of fig5 and 6 , respectively . thus , the receptacle cover 60 a shown in fig1 a - 10 g is used for retaining sensor 40 of the sensor assembly of fig5 a - 5 d . the receptacle cover 60 b is used to retain sensor 52 of the sensor assembly shown in fig6 a - 6 d . and the receptacle cover 60 c shown in fig1 a - 12 e is used to retain sensor 54 of the sensor assembly shown in fig7 . as sensor 56 of the coiled sensor assembly of fig8 a - 8 c has the same dimension as sensor 42 of the sensor assembly of fig5 a - 5 d , receptacle cover 60 a is used to retain sensor 56 . for further discussion , to prevent ambiguities , the different receptacle covers henceforth will simply be referred to as receptacle cover 60 per shown in fig9 . unless specify otherwise , the sensor for the various sensor assemblies discussed above will simply be referred to as sensor 52 , per shown in fig9 . to effect the pocket receptacle or holster into which sensor 52 is to be retained , receptacle cover 60 is slidingly fitted into the portion of housing 12 that defines cavity 28 , by fittingly sliding its edge guides 68 a and 68 b with the respective grooves 78 a and 78 b formed along the corresponding sidewalls 24 a and 24 b that extend from back wall 18 of cavity 28 . once fully inserted into to the housing 12 , receptacle cover 60 along with the back wall 18 of cavity 28 form the receptacle for retaining the corresponding sensor , for example sensor 52 shown in fig9 . the thus configured receptacle 28 a is best shown in fig1 . as should be apparent , the dimension for receptacle 28 a would vary , depending on which of the plurality of sensors shown in fig5 - 8 is to be used with oximeter 2 and which of the plurality of receptacle covers 60 a , 60 b or 60 c is to be fitted to housing 12 for effecting the receptacle , pocket or holster needed to retain the to be used sensor . as receptacle cover 60 is attached to the cavity defining portion of housing 12 , the edge 66 a ( fig1 a ) of the end insert 66 of the cover would come into contact with protuberance 30 . upon contact , due to the inherent elastic property of the plastics material from which the cover is made , the end insert would flex over the protuberance and be latched thereby . end insert 66 then form fittingly seats onto base 26 of cavity 28 . receptacle cover 60 can be removed from cavity 28 by a user asserting a predetermined force to overcome the latching of the cover 60 by protuberance 30 . depending on the type of sensor , and the sensor assembly associate therewith , to be used with oximeter 2 , different ones of the receptacle covers 60 may be affixed to housing 12 of oximeter 2 . after a given receptacle cover 60 is affixed to housing 12 to form receptacle 28 a , the corresponding sensor can be placed into and stored in receptacle 28 a when it is not in use . tongue 70 at the front wall 64 of the receptacle cover 60 biases against the surface of the sensor that it makes contact with so that the senor is pushed against back wall 18 of housing 12 . as a result , once placed into receptacle 28 a , the sensor is firmly held therein unless the user deliberately exerts a force that is greater than the biasing force exerted by tongue 70 against the sensor to remove the sensor from the receptacle 28 a . fig1 is an illustration showing the storage of a sensor in the receptacle that is formed by the affixing of a receptacle cover to the housing of the oximeter . with reference to fig1 , at the interior of compartment 22 at the back of oximeter housing 12 is connector 50 for coupling with sensor connector 46 of the sensor assemblies of fig5 - 8 . connector 46 is guided into the interior of compartment 22 by its ears 46 c and 46 d fittingly slide along two corresponding slots 80 a and 80 b formed at the interior of compartment 23 . with reference to fig1 , a bottom view shows that the bottom surface 82 of the oximeter device 2 has an opening 84 with a passage 84 a toward the back of housing 12 . opening 84 leads to a chamber 86 whereto there is mounted a connector , for example a usb connector , that is adapted to be mated to a counterpart connector . the connector can be connector 90 in a docking station ( fig2 ), or a conventional usb cable connecter for supplying power and / or establishing communication between the oximeter device 2 and an external device . if connector 80 were to couple to a usb cable , the body of the cable can pass through passage 84 a , so that housing 12 can stand upright on a flat surface . fig1 shows a usb cable assembly with its connector 92 configured to mate to connector 88 in chamber 86 of oximeter housing 12 . cable 90 fits into passage 84 a while the body of connector 92 fits into opening 84 , to thereby enable oximeter 2 to stand upright on a flat surface . with the connection of cable 90 to oximeter 2 , as was noted earlier , a communication path is established between oximeter 2 and another device , for example an external monitor or another oximeter that has the capability to monitor remotely the physical attributes being monitored by oximeter 2 , via the sensor of the sensor assemblies shown in fig5 - 8 connected thereto . the ability of oximeter 2 to communicate with another device is disclosed in the aforenoted incorporated by reference co - pending applications . with the connection of cable 90 to oximeter 2 , in addition to establishing an electrical communications path , external power may also be supplied to oximeter 2 . fig1 shows the relationship between any one of the sensor assemblies of fig5 - 8 and oximeter 2 . as shown , connector 46 of a cable of one of the sensor assemblies as noted is matable to connector 50 , for example a db - 9 connecter mounted in chamber 22 a of compartment 22 . slots 80 a and 80 b provide guidance for ears 46 c and 46 d of connector 46 , so that connector 46 would be securely guided to and mate with connector 50 . physical attributes measured by the sensor of the sensor assembly are routed to oximeter 2 so that the measured physical attributed may be displayed on screen 4 of the oximeter , as is well known and performed by the oximeter boards discussed earlier . fig1 shows the connection of a coiled sensor assembly such as that shown in fig8 to oximeter 2 , with connector 46 of the sensor assembly mated to connector 50 in compartment 22 of oximeter housing 12 . fig1 also shows sensor 56 being retained within the receptacle or holster effected by the affixing of receptacle or clip cover 60 , in this instance 60 a of fig1 a - 10 g , to housing 12 . fig1 further shows the coaction between edge 66 a of the end insert 66 of cover 60 a with the protuberance 30 at back wall 18 of housing 12 , for affixing cover 60 a to housing 12 . absent a predetermined force large enough to dislodge cover 60 a from the latching effected by protuberance 30 , cover 60 a stays firmly affixed to housing 12 . moreover , sensor 56 is frictionally retained in receptacle 28 a due to it being biased by tongue 70 against back wall 18 of the receptacle . fig1 is a front view of a second embodiment of the oximeter of the instant invention in which a number of button switches 94 have been added to the front surface of housing 12 . these buttons provide the user additional capabilities , such as changing screen 4 to display other numerical or graphical representations , or other functions that are described in the aforenoted incorporated by reference co - pending applications . fig1 shows another embodiment of the oximeter 2 of the instant invention in which screen 4 is a lcd screen to enable the display of additional graphics and numbers that may represent sensed physical attributes of a patient or additional information for the user of the oximeter , such as text messages including instructions , conditions of the patient and alarms . oximeter 2 of the fig1 embodiment further provides the user a way of communicating with other devices including other oximeters that may communicate telecommunicationally without the need for cables as described in the aforenoted incorporated by reference co - applications . fig2 shows a perspective back view of oximeter 2 in which a battery pack 36 has been removed from chamber 38 and cover 20 has been removed from housing 12 . cover 20 is configured to have a part of passage 84 a at its lower portion formed . fig2 is a perspective view of a docking station 94 to which oximeter 2 may dock . to dock , the usb connector 88 ( fig1 ) of oximeter 2 is mated to a counterpart connector 96 at docking station 94 . connector 96 may be a molex connector that can deliver power to oximeter 2 and establish a communication path between docking station 94 and oximeter 2 . a cradle area 98 is provided in docking station 94 to enable housing 12 of the oximeter to be securely positioned , when oximeter 2 is docked to docking station 94 . the docking of oximeter 2 to docking station 94 is best shown in fig2 . fig2 a - 22 e are different illustrations of the docking station . fig2 a shows the front of the docking station in which a number of informational lights are provided . for example , when the oximeter is docked to docking station 94 , a lit led at 94 a shows that ac power is being provided to the docking station , and a lit led at 94 b shows usb power is available and is being provided to the oximeter . a spare battery charging light , designated by 94 c , shows that a spare battery 100 ( fig2 ) in docking station 94 is being charged . battery pack 100 is inserted into a chamber ( not shown ) behind door 102 at the back of docking station 94 , per shown in fig2 e . the door is shown to be opened in fig2 . fig2 b shows a plan view of the top of docking station 94 , showing the chamber 98 whereto the oximeter is positioned and cradled , and connector 96 to which the usb connector 88 of oximeter 2 is coupled . fig2 d shows a side view of the docking station 94 . fig2 c shows the bottom view of docking station 94 . as shown , a connector 106 is provided inside a chamber 104 having a side passageway . connector 106 enables docking station 94 to be connected to an external device or a power device , so that a communications path and / or a power path may be established between the external device and the oximeter docked to the docking station . the cable assembly to be used with docking station 94 may be same as the cable assembly 90 shown in fig1 . in fig2 e , graphical representations informing a user of how to insert and remove a battery pack are printed on backdoor 102 . fig2 shows the docking of oximeter 2 to the docking station 94 , the opening of door 102 at the back of docking station 94 , and the battery pack 100 having been removed from docking station 94 . fig2 a - 24 e are different views of a printer 108 that is attachable to docking station 94 to enable information from the oximeter to be printed . printer 24 a has a side 108 a that includes a door 110 that may be pivotally open , per shown in fig2 , to allow a roll of printing paper to be installed into printer 108 . printer 108 has a top that contains various switches and designations for a user , per shown by top view 108 b of fig2 c . a side surface 108 c shows how a roll of paper may be inputted to the printer and how door 110 is to be opened and closed . an inside surface view of printer 108 in fig2 b shows a connector 110 that mates with a corresponding connector ( not shown as it is behind cover 112 of docking station 94 in fig2 ) at docking station 94 . connector 110 , when connected to the connector behind cover 112 of docking station 94 , provides communication between docking station 94 and printer 108 . the alignment of printer 108 to dock 94 is effected by removing screw 114 at the side of the docking station 94 and the insertion thereto by guiding post 116 at the side surface 108 d of printer 108 , per shown in fig2 b . fig2 shows printer 108 being hingedly attached to docking station 94 , and fig2 shows the coupling of printing station 108 to docking station 84 . the system formed by the combined docking station 94 and printer 108 allows a user , once oximeter 2 is cradled in docking station 94 , to print out information from the oximeter and docking station , and the transmitting of information between oximeter 2 and the docking station 94 as well as to a remote device , if docking station 94 were to be electrically connected by means of its connector its 106 ( fig2 c ) to the remote device . fig2 shows the system of a , combination of printer 108 and docking station 94 with door 110 opened , possibly to receive a new roll of paper . inasmuch as the present invention is subject to many variations , modifications and changes in detail , it is intended that all matter throughout this specification and shown in the accompanying drawings be interpreted as illustrative only and not in a limiting sense . accordingly , it is intended that the invention be limited only by the spirit and scope of the appended claims . for example , even though an oximeter is described hereinabove , it should be appreciated that a medical device that uses sensors for measuring physical attributes or physiological parameters of a patient may also use the instant invention in that the housing of the medical device may be configured to accept covers or clips of different dimensions so that sensors of different dimensions can be accommodated and carried with the medical device .
an oximeter has a housing configured to have a cavity defining portion that is adapted to be fitted with covers of various dimensions to effect receptacles of different dimensions for accommodating differently sized sensor of sensor assemblies that are matable to the oximeter for sensing physical attributes of a patient . each of the covers , once fully fitted to the housing , is fixedly latched thereto unless a force that overcomes the latching is applied to remove the cover . the effected receptacle is adapted to biasedly retain a corresponding sensor placed therein . the holstered sensor therefore would not accidentally fall out or be removed from the receptacle , until the user deliberately applies a force to remove the sensor from the receptacle .