the invention will be described in closer detail in the following for exemplifying purposes with reference to the accompanying drawings . as shown in fig1 the invention comprises a portable telemedicine device 1 including integrated measuring equipment , such as ecg and vcg , input means for connecting external measuring sensors , a display for displaying the measurement data and the like , entry means for entry of other measurement data , patient &# 39 ; s name , observations and so on , and communication equipment 2 . the portable telemedicine device in accordance with the invention preferably is an easily manageable , integrated unit , illustrated in fig2 . preferably , this unit is also provided with a rechargeable battery unit , which adds to the ambulatory nature of the device . again referring to fig1 the communication equipment 2 may be arranged to transmit digital data via a mobile telephone network , such as gsm or the like , via the mobitex network or by any other suitable means . thus , the telemedicine device may communicate directly with one or several central units 3 or via one or several intermediate stations , such as for instance an ambulance 4 . optionally , the communication may be established via option communication means , such as gsn and mobitex , as selected in accordance with the conditions in each individual case . preferably , the central units are data - processing devices capable of receiving information data and presenting the latter in real time , and also capable of emitting information data to portable units . the central unit preferably also is capable of communicating with other systems , qf storing information data , and of later displaying such stored information data . however , central units of this nature are previously known within the technical field concerned and the design of these units does not form part of the present invention , although they do form part of a system comprising the portable telemedicine device in accordance with the invention . the portable telemedicine device is further advantageously equipped with a connecting interface for allowing convenient docking thereof to stationary equipment 5 , e . g . onboard an ambulance or inside a hospital . the docking interface may be designed to shift its mode of communication at the instance of docking , to allow transmission via another telecommunication network or via cables coupled to the stationary equipment . in addition , the docking may involve connection to network voltage , battery chargers , external entry means ( such as keyboards ), external displays , and so on . optionally , the portable telemedicine device could likewise be adapted for communication via ir transmission using prior - art equipment , such as pda equipment ( personal digital assistant ) and the like . the device may also be adapted for automatic selection of a telecommunication network in response to the current reception conditions , in order thus to offer the best possible transmission performance . such adaptation could likewise depend on the type of information data to be transmitted and on the manner of the transmission . in this way it becomes possible to use different networks for transission for example of large data volumes that must be transmitted to a receiver within a brief space of time , and of short messages that are to be transmitted to several receivers . for instance , the device may utilise networks of such a different nature as the circuit - switched gsm network and the packet - switched mobitex . however , to achieve this versatility feature , adaptations are required in the form of different software as well as different hardware . to make it possible to use such a comparatively slow transmission system as the mobitex , selection and pre - processing of data are required as is also compressing of these data . when the portable telemedicine equipment is intended for use by ambulance staff or other ambulant personnel , it is advantageously brought along when the ambulance staff is called to the patient . the sensors associated with ecg , vcg etcetera are connected , and a first diagnosis may then be made . in some cases it may , however , be more appropriate to defer connection of the equipment until the patient is onboard the ambulance . the display preferably is divided into different fields , showing for example : information on the patient &# 39 ; s name , patient id number , time , and so on ; monitoring information received from the measuring equipment , such as continuous ecg monitoring , blood pressure monitoring , continuous curves indicating the variations in the oxygenation of the blood , and so on ; ecg reports , “ cuttings ” from real - time curve graphs , tendencies , patient case record files , other information , recently received messages , and so on ; status of communication equipment , such as available connected receivers and the band width of the communication channel ; messages received and emitted , inclusive of facilities for browsing through old messages ; setting options , e . g . different communication networks , reception and transmission via ambulance or not , different areas of application , choice of external equipment to be connected , and so on . in addition , the menu system could advantageously be designed to comprise several levels , including one main menu and one or several levels including sub - menus . following connection of the equipment . information data are entered , either automatically via the measuring instruments or manually by the patient - attending staff . some information data , such as those relating to certain measurement results , annotations entered into patient case record files , patient information and so on , are then transmitted automatically to the predetermined receivers to which the device is connected , whereas other information data are forwarded only as ordered by the attending staff . a transmission list determines which receivers are to be used in each individual case , from which list one or several central units may be preselected . preferably , the list may be altered in the process of use . the information to be transmitted may be assigned different priorities , the information data most essential for correct diagnosis and for the implementation of correct treatment being given a higher priority and being transmitted prior to information data of less importance . this feature is particularly advantageous for instance when the capacity of the communication network is such that the latter is slow in transmitting the information and when it may not even be possible to transmit all information . the priority feature may be implemented manually , or , which in most cases is the preferred alternative , automatically with the aid of software , or else a combination of the two varieties is possible . the medical usefulness should , at all times , govern the priority . in addition , the portable telemedicine equipment is supplied with information data from the central unit , on the one hand in the . form of messages from e . g . specialist physicians , the co - ordinating control group , etcetera , and on the other in the form of data from the patient &# 39 ; s case record file and the like , data which are already stored in databases 6 in the central unit . in addition to its use in showing measurement results , the portable telemedicine device in accordance with the invention could also be used for filling in certain forms , such as patient &# 39 ; s case record files and the like , in addition to which it offers facilities for communication with a central unit ( or several central units ) via the telecommunication network . the central unit could be positioned e . g . in the closest large hospital where the received information data could be examined by specialist physicians of the relevant medical discipline and a correct decision be taken rapidly , both with respect to the treatment to be implemented right away and to the planning and the preparations for the continued treatment . in other words , owing to the communication facility , measurement results and other entered information data are transmitted in full or in part from the portable telemedicine equipment to the central unit , and the information data , which may include treatment counselling , queries relating to the diagnosis , information regarding where to transport the , and so on , are transmitted from the central unit to the portable unit . in addition , all dialogue preferably should be stored in the portable unit and / or the central unit . the various part components of the device are , as already mentioned , preferably integrated in an easily manageable unit , thus making it simple to handle , and versatile and easy to transport and to connect . optionally , additional equipment could be included as parts of the device or be connectable thereto , such as printers , cameras , microphones , loud - speakers , etcetera , depending on need , communication channel capacity and so on . according to a particularly preferred embodiment the portabel unit is provided with an entry means of a special design and forming part of the present invention . as appears from fig2 the entry means comprises a bottom plate 11 formed with an entry means consisting of a rotatable and depreciable actuating member 12 in the form of e . g . a ball or a wheel , and of additional entry buttons 13 and 14 . the actuating member affects a cursor on the display screen in such a manner that the cursor moves in response to actuation of the actuating member . the cursor is only movable backwards and forwards between points in a predetermined order . for instance , the cursor movement could be upwards and downwards in a vertically arranged menu , jumping between a number of different windows on the screen or the like . upon depression of the actuating member 12 the object highlighted at that moment by the cursor is activated ( i . e . the function identical to that of the “ enter ”- key on an ordinary keyboard ). in this situation , either the indicated function is performed , involving for instance entering an object in the form , or else a sub - menu appears , whereupon the procedure is repeated . in this manner it likewise becomes possible to enter text or figures , in that by turning the actuating member the operator may proceed through the entire alphabet or the numbers and by depressing the member indicate the letters or figures he wants to enter . out of the extra entry buttons of the entry means , one button 13 is for verifying incoming messages or alarms and one button 14 for moving to a superior menu level . in addition to these two buttons the entry means could be supplemented with numeric keys 15 representing digits 0 - 9 etcetera , in order to render the data input more efficient , should the entry items comprise several measurement values in digit form . in addition , the entry means preferably comprises a delete button 16 to erase entered values . an entry means in accordance with the invention occupies but a fraction of the space required by a conventional keyboard , in addition to which it could advantageously be placed vertically , a position most unsuitable for conventional keyboards . for instance , an lcd display and an associated , e . g . juxtaposed entry means in accordance with the invention may easily be placed in positions where conventional terminals cannot be used . in addition , the entry of input data may easily be effected using one hand only . when the entry means is used as described above , the display preferably is divided into several fields , such as shown for example in fig3 . in this drawing figure is illustrated one example of a display layout that may be used by the medical services and that comprises one field 21 containing information on the patient &# 39 ; s name , identity number , information on the status of the communication and similar comprehensive information , a second field 22 containing a presentation , for instance in the form of curve graphs , representing incoming measurement values and the like ( e . g . from ecg ), a third field 23 containing measurement data derived from other ( or the same ) measurement instruments and alarm limits , and a fourth field 24 containing a menu of selectable options . as the actuating member is being rotated different menu options will be highlighted in a predetermined order . this predetermined order could be e . g . from the top towards the bottom , or inversely depending on the direction in which the operator rotates the actuating member . the highlighted option is activated upon depression of the actuating member , causing either the activation of a function or the appearance of a new sub - menu . [ 0044 ] fig4 illustrates one example of the configuration of a display upon activation of a “ case record file ” function for entering information data into the patient &# 39 ; s case record file . under this option heading , a sub - menu appears . in this case , the sub - menu comprises four different case record fields and three additional menu options . to enter data , the operator / attendant turns e . g . the actuating member 12 , causing the first case record field to be highlighted , whereupon he depresses the actuating member to activate the highlighted field . in this field , there are two alternative choices : input of personal code number and input of personal name . as the personal code number is entered , this option is highlighted in the same manner as mentioned above , whereupon one digit at a time is entered . this could be achieved e . g . by means of a line of numbers which appears on the display and from which desired numbers are chosen through rotation and depression of the actuating member as indicated previously . alternatively , the highlighted number is increased or decreased by means of rotation of the actuating member , followed by depression of the member , the corresponding number thus being chosen and the cursor made to proceed to the next position , wherein the procedure is repeated . in order to return to the immediately superior menu the latter could either be permanently available as a last selectable menu option or else be retrieved by use of the particular return button . an entered digit could be cancelled / deleted with the aid of the button provided for this purpose . entry of letters is effected in the same manner as entry of figures , and figures as well as letters as also other signs may be selectable in all positions . in addition , the entry procedure could in many cases be simplified , when only a restricted amount of entry options exists or occurs frequently . in such cases , the data entry could be effected via a menu comprising predefined options , such as shown for example in the fourth , lowest case record field in fig4 . in this field , the diagnosis , such as “ angina pectoris ”, may be entered by advancing the cursor through rotation of the actuating member until the cursor reaches the relevant option , and by subsequently marking the latter as indicated above . several modifications of the entry means in accordance with the invention are conceivable . for instance , the entry means need not comprise supplementary entry buttons but the rotatable and depressible actuating member by itself suffices in many cases . in addition , the actuating member could optionally be divided into two separate means , one of which is rotatable whereas the other is depressible . several modifications of other parts of the invention are of course likewise possible . for example , other measurement equipment than that mentioned in the aforegoing may be coupled to the device . the device could furthermore be used in other applications involving services and activities related to nursing and attending of individuals , such as home - help services . such closely related varieties of the invention must be regarded to be within the scope of the invention as the latter is defined in the appended claims .