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US20020013551A1 - Medical pump monitoring system - Google Patents

Medical pump monitoring system Download PDF

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Publication number
US20020013551A1
US20020013551A1 US09/864,394 US86439401A US2002013551A1 US 20020013551 A1 US20020013551 A1 US 20020013551A1 US 86439401 A US86439401 A US 86439401A US 2002013551 A1 US2002013551 A1 US 2002013551A1
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United States
Prior art keywords
data
infusion
medical
external apparatuses
controlling
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US09/864,394
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English (en)
Inventor
Akinori Zaitsu
Kou Ishikawa
Kenji Nakahara
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Terumo Corp
Original Assignee
Terumo Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP2000161155A external-priority patent/JP4608053B2/ja
Priority claimed from JP2000352537A external-priority patent/JP4279985B2/ja
Application filed by Terumo Corp filed Critical Terumo Corp
Assigned to TERUMO KABUSHIKI KAISHA reassignment TERUMO KABUSHIKI KAISHA ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ISHIKAWA, KOU, NAKAHARA, KENJI, ZAITSU, AKINORI
Publication of US20020013551A1 publication Critical patent/US20020013551A1/en
Priority to US10/820,840 priority Critical patent/US8612257B2/en
Abandoned legal-status Critical Current

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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/14—Infusion devices, e.g. infusing by gravity; Blood infusion; Accessories therefor
    • A61M5/1413—Modular systems comprising interconnecting elements
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/14—Infusion devices, e.g. infusing by gravity; Blood infusion; Accessories therefor
    • A61M5/142—Pressure infusion, e.g. using pumps
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/14—Infusion devices, e.g. infusing by gravity; Blood infusion; Accessories therefor
    • A61M5/168—Means for controlling media flow to the body or for metering media to the body, e.g. drip meters, counters ; Monitoring media flow to the body
    • A61M5/172—Means for controlling media flow to the body or for metering media to the body, e.g. drip meters, counters ; Monitoring media flow to the body electrical or electronic
    • G—PHYSICS
    • G16—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR SPECIFIC APPLICATION FIELDS
    • G16H—HEALTHCARE INFORMATICS, i.e. INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR THE HANDLING OR PROCESSING OF MEDICAL OR HEALTHCARE DATA
    • G16H20/00—ICT specially adapted for therapies or health-improving plans, e.g. for handling prescriptions, for steering therapy or for monitoring patient compliance
    • G16H20/10—ICT specially adapted for therapies or health-improving plans, e.g. for handling prescriptions, for steering therapy or for monitoring patient compliance relating to drugs or medications, e.g. for ensuring correct administration to patients
    • G16H20/17—ICT specially adapted for therapies or health-improving plans, e.g. for handling prescriptions, for steering therapy or for monitoring patient compliance relating to drugs or medications, e.g. for ensuring correct administration to patients delivered via infusion or injection
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M2205/00—General characteristics of the apparatus
    • A61M2205/33—Controlling, regulating or measuring
    • A61M2205/3331—Pressure; Flow

Definitions

  • the present invention relates to a medical pump monitor system administering medical fluids using a plurality of medical pumps for one patient, and managing information of these medical pumps collectively, a controlling method therefore, and a computer-readable memory associated with control thereof.
  • the present invention also relates to a real-time monitoring system performing real-time communication with external apparatuses including one or more medical apparatuses to control such external apparatuses and/or display the conditions thereof, a controlling method therefore, and a computer-readable memory (storage medium) storing therein a control program thereof.
  • FIG. 2 A schematic diagram of a system in which medical pumps independent of one another are connected to a personal computer via communication cables, and flow volumes and alarm information of the medical pumps are collected and displayed as application software of the personal computer is shown in FIG. 2.
  • FIG. 3 a schematic diagram of a type of a pump monitor system in which pumps share a power supply line and a data communication line with one another through a power connector 53 and a communication connector 54 , and medical pumps 51 and 52 are connected in such a manner that they are stacked one after another on a base unit 55 comprising a display unit 101 on which the flow and alarm information for each pump is shown in FIG. 3.
  • FIG. 2 shows a conventional medical pump system
  • reference numeral 20 denotes a personal computer with system application software installed therein
  • reference numeral 21 denotes a display device (display unit) such as a CRT and a liquid crystal monitor connected to the personal computer
  • reference numeral 22 denotes communication port expanding means such as a multiplexer for expanding communication ports of RS 232C that are typically provided with only one or two channels to 4 channels, 8 channels or the like
  • reference numerals 23 , 24 , 25 and 26 denote medical pumps.
  • reference numeral 27 denotes a patient, and medical pumps of 23 to 26 deliver individual set liquid medicines into the patient.
  • FIGS. 4A to 4 C show cases where the same number of medical pumps as in FIG. 2 are used to perform administration for one patient, wherein their administration passes are different from one another due to the condition of the patient, administrated drugs and the like.
  • FIG. 4A shows a case where four pumps each have individual infusion lines and drugs are injected into different points of the patient
  • FIG. 4B shows a case where two infusion lines of four medical pumps are connected with each other and the other two infusion lines are also connected with each other.
  • FIG. 4C shows a case where four medical pumps are all integrated into one line to carry out administration for the patient.
  • the present invention has been made in the light of problems as described above, and its object is to provide a system in which the operation conditions of a plurality of medical pumps are monitored for one patient with a function of creating and editing an infusion line from the pump to the patient on each-by-each basis, and display information created and edited by means of this function on the system, thereby making it more easy to confirm the current states of infusion lines.
  • Another object of the present invention is to provide a function of capturing hand written diagrams and so on together with the function of creating and editing the infusion line, and an operator is allowed to make a choice on whether the function of creating and editing the infusion line is used to create the infusion line, or handwritten diagrams and so on are captured in the system to display the same, thus making it possible display various cases of the infusion line on the medical pump monitor system.
  • Still another object of the present invention is to provide a real-time monitoring system, a controlling method therefore and a program storage medium, which enable real-time monitoring of the operation states, arrangement/connection states, alarm information of a plurality of medical apparatuses such as infusion pumps, syringe pumps, blood monitors, urinary volume monitors, water contents of medical fluids, states of intake and output of electrolytes and so on.
  • a plurality of medical apparatuses such as infusion pumps, syringe pumps, blood monitors, urinary volume monitors, water contents of medical fluids, states of intake and output of electrolytes and so on.
  • FIG. 1 shows a block diagram of a medical pump system in the first embodiment of the present invention
  • FIG. 2 shows a block diagram of the medical pump system in prior arts
  • FIG. 3 shows a block diagram of a medical pump system of another embodiment in prior arts
  • FIG. 4A shows one of block diagrams of infusion circuitry patterns in the first embodiment of the present invention
  • FIG. 4B shows one of block diagrams of infusion circuitry patterns in the first embodiment of the present invention
  • FIG. 4C shows one of block diagrams of infusion circuitry patterns in the first embodiment of the present invention
  • FIG. 5 shows a medical pump monitor screen in the first embodiment of the present invention
  • FIG. 6 shows a screen for creating infusion circuitry in a medical pump monitor system in the first embodiment of the present invention
  • FIG. 7A shows the screen for creating infusion circuitry in the medical pump monitor system in the first embodiment of the present invention
  • FIG. 7B shows the screen for creating infusion circuitry in the medical pump monitor system in the first embodiment of the present invention
  • FIG. 7C shows the screen for creating infusion circuitry in the medical pump monitor system in the first embodiment of the present invention
  • FIG. 7D shows the screen for creating infusion circuitry in the medical pump monitor system in the first embodiment of the present invention
  • FIG. 7E shows the screen for creating infusion circuitry in the medical pump monitor system in the first embodiment of the present invention
  • FIG. 7F shows the screen for creating infusion circuitry in the medical pump monitor system in the first embodiment of the present invention
  • FIG. 7G shows the screen for creating infusion circuitry in the medical pump monitor system in the first embodiment of the present invention
  • FIG. 8 shows the screen for creating infusion circuitry according to another embodiment in the medical pump monitor system in the first embodiment of the present invention
  • FIG. 9 shows an example of a configuration of a control unit 100 in FIG. 1;
  • FIG. 10A is a flowchart showing a flow of infusion circuitry creation processing in the first embodiment of the present invention.
  • FIG. 10B is a flowchart showing the flow of infusion circuitry creation processing in the first embodiment of the present invention.
  • FIG. 11 is a block diagram in the second embodiment of the present invention.
  • FIG. 12 shows a display screen in the second embodiment of the present invention
  • FIG. 13 shows a structure of stored data in a storing unit in the second embodiment of the present invention
  • FIG. 14 shows a display screen of real time monitoring in the second embodiment of the present invention.
  • FIG. 15 shows an inverse data check system in the second embodiment of the present invention.
  • FIG. 18 shows a method of detecting a position in which data is changed in the second embodiment of the present invention
  • FIG. 19 shows a method of detecting a position in which data is changed in the second embodiment of the present invention
  • FIGS. 21A to 21 C show an example of a monitor screen in the first embodiment of the present invention.
  • FIGS. 22A to 22 C show an example of a monitor screen in the first embodiment of the present invention.
  • Reference numeral 100 denotes a controller (control unit), which makes up a central portion of this medical pump monitor system, and for the controller, a personal computer having an inputting device such as a keyboard and a pointing device such as a mouse is usually used.
  • Reference numeral 101 denotes a display (display unit), which displays flow values and alarm information for a plurality of medical pumps of 103 , 104 , 105 and 106 , collected by the controller 100 , and the urinary volume from urinary volume meters 111 and the amount of electrolytes (Na + , Ca 2+ , K + , Cl ⁇ ) from catheter type censor 112 , and displays infusion lines.
  • a CRT or a liquid crystal monitor is used for the display (display unit) 101 .
  • Reference numeral 102 denotes a scanner (reading means) for capturing handwritten information of infusion lines
  • reference numeral 102 a denotes a scanner for reading product identification information (such as bar codes), and they are connected to the controller 100 .
  • Reference numeral 107 denotes communication port expansion device (communication port expanding means) such as a multiplexer formultiplying communication ports when the controller 100 is poorly equipped with ports for communicating with pumps that collect data.
  • the controller 100 is connected to medical pumps 103 , 104 , 105 and 106 via this communication port expansion device 107 using a communication cable (wired) 109 or is connected therewith wirelessly.
  • the configuration of the controller 100 is, for example a configuration as shown in FIG. 9, which comprises a CPU 901 , a RAM 902 , a ROM 906 , a HDD 909 , a floppy disk (FD) 906 a , a keyboard 904 and amouse 905 , and is connected to a display 101 and is connected via an I/F 903 to the scanner 102 . It is further connected via an I/F 907 to the communication port expansion device 107 . Also, it is connected to the host computer of a nurse station or the like through an external communication port 107 a.
  • voice information is given by voice informing means 908 for calling attention if it is a drug not included in the database file.
  • the identification information of this pump and the drug identification information are stored in the RAM 902 as a pair, and are displayed together on the display unit 101 as shown in FIG. 5.
  • the controller 100 communicates with four pumps connected as medical pumps 103 , 104 , 105 and 106 in succession at a fixed time interval (for example one minute interval), wirelessly and/or with cables.
  • the communication is data for requesting information of current flows of administered fluids from respective medical pumps 103 , 104 , 105 and 106 , and when the request data are received by the pumps, the pumps send back the flow information to the controller 100 in predetermined format.
  • the controller 100 subsequently sends signals requesting alarm information to the connected medical pumps 103 , 104 , 105 and 106 , and when they are received by the pumps, the pumps also send back the alarm information to the controller 100 based on a predetermined format. Furthermore, if there exists no alarm information, then a signal indicating no alarm information is sent back to the controller 100 .
  • the controller 100 displays information from connected medical pumps 103 to 106 on the display (display unit) in such a manner that it is displayed along a pump information display area shown in FIG. 5.
  • a region denoted by reference numeral 501 is a region in which operation states of medical pumps 103 to 106 are indicated by color, for example by green during normal operations (described with blank in this figure), by red when an alarm is given (described with vertical lines in this figure), by yellow in the case when administration operations are interrupted (described with slashes in this figure) and by gray when the pump itself is not connected. Also, its contents (occlusion, abnormal flows, etc.) are displayed at the same time.
  • a region denoted by reference numeral 502 is a region in which the flow value of the pump 103 is indicated.
  • Reference numeral 503 denotes a region in which alarm information currently occurring in the medical pump 103 is indicated, and the region is blanked when no alarm is given.
  • Reference numeral 504 denotes a region in which drugs that are administered are displayed. The system can be operated even if drugs to be administered are not defined, but in this case, the region is blanked.
  • Reference numeral 540 denotes an infusion circuitry display region (infusion circuitry display unit), a region in which a graphic file stored in the controller 100 in predetermined format and file name is displayed.
  • the graphic file may be a general graphic file such as a bit map file and a JPG file in the case where the controller 100 is a personal computer or the like.
  • a bit map file of 24 bits color with 640 dots (lateral direction) ⁇ 480 dots (vertical direction) is stored in file name of “C: ⁇ Yuekic.bmp”.
  • a condition displayed in FIG. 5 is based on the assumption that a bit map file for displaying infusion circuitry is stored in advance, and information of the medical pump 103 is displayed in the regions 501 to 504 .
  • a square denoted by numeral 104 corresponds to the medical pump 104 of which information is displayed in the regions 511 to 514
  • a square denoted by numeral 105 corresponds to the medical pump 105 of which information is displayed in the regions 521 to 524
  • a square denoted by numeral 106 corresponds to the medical pump 106 of which information is displayed in the regions 531 to 534 .
  • infusion lines 110 running from the medical pump 103 and the medical pump 104 are integrated into one line to form a first infusion line L 1 to be fixed in administration position near the right brachium part of the patient 27
  • infusion lines 110 running from the medical pump 105 and the medical pump 106 are integrated into one line to form a second infusion line L 2 to be fixed in administration position near the left thigh part of the patient 27 .
  • a diagram of infusion circuitry should be reregistered not only in cases where administration is started for a new patient, but also in cases where administration passes are changed due to change of drugs to be administered for long-term administration.
  • a “C: ⁇ Yuekic.bmp” file may be created anew.
  • the “C: ⁇ Yuekic.bmp” file can be created either by clicking the circuitry creation function calling button 541 or by clicking the circuitry read function calling button 542 .
  • FIG. 6 When the circuitry creation function calling button 541 is clicked, a window is displayed on the display unit as shown in FIG. 6.
  • the arrangement of the pumps 103 to 106 is displayed by selecting from a plurality of arrangement patterns stored in memory means that is the most suitable for the therapy for the patient.
  • reference numerals 601 to 604 denote medical pumps as shown in the region 540 in FIG. 5.
  • the return button is clicked once, whereby finally conducted action (clicking of the left thigh part selection button in this case) is determined as being invalid, and the state in which the medical pump 604 is selected is provided.
  • the created diagram of infusion circuitry is created as a bmp file format, and is stored in the name of “C: ⁇ Yuekic.bmp”.
  • an interruption button for interrupting processing to end the infusion circuitry creation function may be provided.
  • the junction is considered as a point, but in the case where transfusion using three-way stop cocks, Yshaped-tubes, Tshaped-tubes and the like is conducted, a three-way stop cock button and a Yshaped-tube button are provided in place of the junction production button, thereby making it possible accommodate the situation.
  • bit map file is created in this embodiment, the history of operational actions is recorded in other format separately, thereby making it possible to cope flexibly with the situation in which infusion circuitry is slightly changed.
  • the drawn line is selected in reverse chronological order (S 1005 , S 1006 ).
  • the history back button is once clicked, the infusion line between the right-hand junction and the pump 604 is selected.
  • the history back button is selected once again, the state in which the infusion line between the right-hand junction and the pump 604 is selected is released, and the infusion line between the right-hand junction and the left thigh part is selected.
  • the history back button is clicked three times after the time when the window appears. Thereby, the line drawn between the medical pump 603 and the right-hand junction is selected.
  • the line deletion button is clicked in this condition, followed by clicking the medical pump 603 and the right-hand junction one after another, whereby the infusion line is drawn between the medical pump 603 and the right-hand junction (FIG. 7G).
  • the infusion circuitry creation function is ended after the bit map file is stored (S 1017 ) and normal pump monitor processing is carried out, but at this time, processing of updating the infusion circuitry diagram display region 540 to the new bit map file is carried out.
  • the administration pass to the patient is selected from a plurality of buttons in this embodiment, but this is for the purpose of easy determination of the position of the line, and if it is desired that more detailed positions are identified, methods in which the number of buttons is further increased, click is made directly on the model picture of the patient, and so on can also be adopted.
  • the infusion circuitry diagram read function start button 542 is clicked, whereby the scanner 102 is controlled from the controller 100 , and the circuitry diagram set in the scanner 102 is read in the system, and is stored in a format as in the case of the creation of infusion circuitry described previously and in the same name of “C: ⁇ Yuekic.bmp”. Thereby, the system can create the infusion circuitry diagram using the creation function, and display/manage the diagram without classifying cases either when a registration is made or when the scanner 102 is used to read the diagram for making a registration.
  • the scanner 102 is used as means for capturing an infusion circuitry diagram such as a handwritten diagram in this embodiment, but it is apparent that similar effects can be obtained by photographing the handwritten infusion circuitry diagram by a digital camera and having the memory medium of the digital camera read by the controller.
  • the medical pump system of the present invention it is possible to provide a system in which the operation conditions of a plurality of medical pumps are monitored for one patient with a function of creating and editing an infusion line from the pump to the patient on each-by-each basis, and display information created and edited by means of this function displayed on the system, thus making it much easier to confirm (monitor) the current states of infusion lines.
  • FIGS. 21A to 21 C show a trend graph of the amount of water displayed after computing the total of the amount of water introduced by all the medical pumps that are used (Intake) and the amount of water discharged as urine (Output) is shown.
  • the range of ml/h can be changed by pressing (clicking) a “+” or “ ⁇ ” key.
  • the amount of water in any time range can be displayed by using “ ⁇ ” or “ ⁇ ”.
  • FIG. 21A shows a trend graph of the balance of water (Intake and Output) at the current time.
  • FIG. 22A to 22 C show a trend graph of the amount of Na + as one example of electrolytes displayed after computing the total of the electrolytes (Na + , Ca 2+ , K + , Cl ⁇ , etc.) introduced by all the medical pumps that are used or computing the data from the sensor 112 .
  • the range of mEg can be changed by pressing a “+” or “ ⁇ ” key.
  • the amount of electrolytes in an arbitrary time range can be displayed by performing operations similar to those in FIGS. 21A to 21 C and using “ ⁇ ” and “ ⁇ ”.
  • these totals and trend graphs can be used as diagnostic/therapeutic data at different location by downloading them to the FD 906 a or sending them to the host computer or the like through the external port 107 a .
  • An alarm is given when the amount of the electrolyte exceeds a preset input value (threshold)
  • the screen may be reduced into quarters to display the amounts of four electrolytes of Na + , Ca 2+ , K + , Cl ⁇ .
  • FIG. 11 is a block diagram of the present invention.
  • an example of connection of three external apparatuses including medical devises and the like such as infusion pumps, syringe pumps, body pressure monitors, body temperature monitors, urinary volume monitors and electrocardiographs is shown, but this number of apparatuses can be arbitrarily increased or decreased.
  • An external apparatus 1 ( 1121 ) is connected through a communication cable to a communication port (external communication unit) 1 ( 1111 ) of this system ( 1105 ).
  • an external apparatus 2 ( 1122 ) and an external apparatus 3 ( 1123 ) are connected to a communication port (external communication unit) 2 ( 1112 ) and a communication port (external communication unit) 3 ( 1113 ), respectively, in a one-to-one correspondence.
  • Communication ports 1 ( 1111 ), 2 ( 1112 ) and 3 ( 1113 ) are brought together in a communication unit ( 1104 ).
  • a communication unit ( 1104 ) For the communication unit ( 1104 ), a variety of configurations are possible such as a microcomputer control communication board to make connection to a plurality of communication ports and a multiplexer type to switch ports for communication when they are used. Signals obtained from the communication unit ( 1104 ) are stored in storing means ( 1103 ), and are sent to a comparison unit ( 1102 ) simultaneously.
  • the comparison unit compares operation (operating) information of the connected external apparatuses 1 ( 1121 ), 2 ( 1122 ) and 3 ( 1123 ) sent from the communication unit ( 1104 ) with operation (operating) information of the previous external apparatuses 1 ( 1121 ), 2 ( 1122 ) and 3 ( 1123 ) stored in the storing unit ( 1103 ), and sends a non-change signal to a control unit ( 1101 ) if there is no difference, and sends a differential signal to the control unit ( 1101 ) if there is a difference.
  • the control unit ( 1101 ) changes the contents of the display unit based on the signal from the above described comparison unit.
  • the communication unit ( 1104 ) and the communication ports ( 1111 to 1113 ) in FIG. 11 correspond to the controller 100 in FIG. 1.
  • FIG. 20 A program corresponding to the flowchart shown in FIG. 20 may be stored in the storing unit ( 1103 ) in FIG. 11, or may be provided by a CD-ROM and the like.
  • a screen configuration on the display unit 1100 of the system of the present invention is shown in FIG. 12.
  • the flow values of the flow meter 1 , of the flow meter 2 and of the flow meter 3 are displayed in textbox objects 1 ( 1201 ), 2 ( 1202 ) and 3 ( 1203 ), respectively in such a manner that their actual placement can be visually confirmed. Also, the total flow value obtained by adding up the values of the flow meters 1 , 2 and 3 is displayed in a textbox object 4 ( 1204 ).
  • Communication between the system ( 1105 ) and the flow meters 1 , 2 and 3 will be described as a command respond mode in which the current flow values of the flow meters 1 , 2 and 3 are sent back when request signals from the communication unit ( 1104 ) are received, but it can also be configured with a mode in which signals from the flow meters 1 , 2 and 3 are unilaterally sent to the host system at a fixed time interval in an asynchronous manner, and so on. Furthermore, in actual systems, signals showing the start and end of the signal such as STX and ETX and checksum signals are often added, but these signals are omitted in this embodiment.
  • the storing unit ( 1103 ) needs an area of six bites in total for storing two bytes of information from three flow meters 1 , 2 and 3 , respectively. For example, if the flow values of the flow meters 1 , 2 and 3 are 100.0 ml/h, 200.0 ml/h and 300.0 ml/h, respectively, information as shown in FIG. 13 is stores in the 6-byte area of the storing unit ( 1103 ).
  • the communication unit ( 1104 ) sends request signals to the flow meters 1 , 2 and 3 (S 2001 ), performs processing of receiving flow values from the flow meters 1 , 2 and 3 for the three flowmeters 1 , 2 and 3 one after another (S 2002 ), and sends the data to the comparison unit ( 1102 ) at the time of obtaining the flow values from the three flow meters 1 , 2 and 3 (S 2003 ).
  • the signal with the flow changed is represented by “the number of the flow meter with the flow changed” +“the flow value after changing” in the embodiment, but in the case where values of two or more flow meters are changed, two signals put together may be sent. For example, if the flow value of the flow meter 1 is changed from 90.0 ml/h to 100.0 ml/h, and the flow value of the flow meter 3 is changed from 120.0 ml/h to 80 ml/h, a 6-byte signal of 011000030800 in hexadecimal digits may be sent as for a signal that is sent from the comparison unit to sending means.
  • all the flow values amongthe external apparatuses 1 ( 1121 ), 2 ( 1122 ) and 3 ( 1123 ) may be sent if at least one of all the flow values of the external apparatuses 1 ( 1121 ), 2 ( 1122 ) and 3 ( 1123 ) is changed.
  • the byte number of the differential signal is constant 9 bytes, a burden on information processing (signal processing) can be reduced.
  • changes can be made as appropriate depending on the number of external apparatuses connected to the system ( 1105 ), the frequency of changing external apparatuses and the importance of patient monitor information.
  • operation information (operation signals) among the external apparatuses 1 ( 1121 ), 2 ( 1122 ) and 3 ( 1123 ) are received in succession, and past operation information stored in the storing unit ( 1103 ) and operation information currently received from the external apparatuses 1 ( 1121 ), 2 ( 1122 ) and 3 ( 1123 ) are outputted.
  • the comparison unit ( 1102 ) compares the past operation information with the current operation information, generates information (differential information) showing a difference between the past operation information and the current operation information and sends the information to the control unit ( 1101 ).
  • the contents in the storing unit ( 1103 ) is set 0 (or data outside the normal range) at the time of starting the system, whereby the data of all the flow meters are sent to the control unit ( 1101 ) because the data of the flow meters 1 , 2 and 3 obtained from the communication unit ( 1104 ) are different from the information stored in the storing unit ( 1103 ), and the latest flow values of the flow meters are automatically displayed on the display unit ( 1100 ) when the system starts.
  • FIG. 15 communication data obtained by the communication unit in the case of large amount of information is shown.
  • a slave address showing a number of a slave (external apparatus) and data comprised of operation conditions of slaves are exist between a header such as STX and a terminator such as ETX.
  • data such as operation conditions are decomposed out of received data (decomposition A). Coding by exclusive OR (XOR) (BCC: Block Check Character) is performed for data of this decomposition A by each word from the heading, what is finally produced is considered as BCC 1 (Type I transformation).
  • XOR exclusive OR
  • BCC 2 Type II transformation
  • BCC coding is generally used and its reliability is acknowledged, but further coding processing is performed using reversed data in calculation, and two BCCs having no causal relation are compared with each other, thereby improving safety. Due to this safety, the amount of data can be reduced as shown in FIG. 16 without storing all received data to shorten memory access time. Also, if the received signal includes BCC in advance, the BCC data is directly used, whereby the above described decomposition work and calculation processing can be reduced and further enhancement of the speed can be expected.
  • parity data (equivalent data) of each data is stored, and its change is detected, thereby making it possible to make a quick check on which portion of communication data has data subjected to change.
  • FIGS. 18 and 19 show a method of detecting the position of changed data. Structures of BCC data and parity data for data such as the operation condition of the slave are shown in FIG. 18. Processing is performed as in the case of FIG. 15 in the previous example with respect to BCC, and for this data, parity data having parity codes corresponding to the bit of each 1-byte data put together on an eight-by-eight basis is also to be checked as data of the vertical component, in addition to the lateral check system.
  • parity data are aligned in succession after each slave address, and after that, BCC 1 and BCC 2 similar to those shown in FIG. 16 are stored.
  • parity data are data of P 1 , P 2 , P 3 and Pn. Pn increases/decreases with the increase/decrease of communication data 8 bytes. The processing flow thereof is similar to that shown in FIG.
  • operation states, alarm information, etc. of external apparatuses including a plurality of medical apparatuses such as infusion pumps, syringe pumps and blood pressure monitors having a large amount of send data can be monitored in real time.

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US8612257B2 (en) 2013-12-17
US20040193328A1 (en) 2004-09-30

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