US20040260189A1 - Control of data transmission between a remote monitoring unit and a central unit - Google Patents
Control of data transmission between a remote monitoring unit and a central unit Download PDFInfo
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- US20040260189A1 US20040260189A1 US10/778,886 US77888604A US2004260189A1 US 20040260189 A1 US20040260189 A1 US 20040260189A1 US 77888604 A US77888604 A US 77888604A US 2004260189 A1 US2004260189 A1 US 2004260189A1
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/0002—Remote monitoring of patients using telemetry, e.g. transmission of vital signals via a communication network
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B2560/00—Constructional details of operational features of apparatus; Accessories for medical measuring apparatus
- A61B2560/02—Operational features
- A61B2560/0204—Operational features of power management
- A61B2560/0209—Operational features of power management adapted for power saving
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B2560/00—Constructional details of operational features of apparatus; Accessories for medical measuring apparatus
- A61B2560/02—Operational features
- A61B2560/0266—Operational features for monitoring or limiting apparatus function
- A61B2560/0271—Operational features for monitoring or limiting apparatus function using a remote monitoring unit
Definitions
- This invention relates to the transmission of data between a remote monitoring unit and a central unit, and more particularly to the optimization of such data transfer.
- U.S. Pat. No. 5,959,529 describes a monitoring system in which the patient carries a remote monitoring unit with associated physiological sensors.
- the remote monitoring unit conducts a continuous monitoring of one or more physiological characteristics of the patient according to the medical problem of the patient, an example being the heartbeat and its waveform.
- the remote monitoring unit contacts a central unit to communicate information on the condition of the patient. For example, if the remote monitoring unit determines that the monitored physiological data suggests that the patient may be in distress or in an emergency, it may immediately and automatically transfer the monitored data to the central unit over a cellular telephone or comparable communications device.
- the central unit automatically, or in conjunction with medical personnel who are stationed at or are in contact with the central unit, analyzes the data and coordinates the provision of assistance to the patient when necessary. Where the analysis of the transmitted data indicates that there is no patient situation requiring immediate attention, the data is stored and may also be forwarded to the patient's physician so that treatments may be altered.
- the present invention provides an approach for monitoring a patient and providing support to the patient.
- the present approach adopts a new data transfer architecture with improved selectivity of data transmission but retention of the data accumulation capability to build the patient history and also the emergency capability to assist the patient on an urgent basis when needed.
- the battery power of the remote monitoring unit is thereby used more judiciously, the cellular telephone connect time is reduced, and medical personnel time is better managed.
- a method of monitoring a patient comprises providing a monitoring apparatus including a remote monitoring unit associated with the patient.
- the remote monitoring unit includes a sensor that measures a physiological characteristic of the patient such as a cardiogram, a central unit, and a communications device which selectively establishes a communications link between the remote monitoring unit and the central unit.
- the remote monitoring unit obtains a monitored data set for the patient, analyzes the monitored data set to obtain a derived data set from the monitored data set, and determines from the derived data set that communication with the central unit is required.
- a communications link is established with the central unit, and the remote monitoring unit transmits to the central unit an initially transmitted data set related to the monitored data set.
- the central unit analyzes the initially transmitted data set and instructs the remote monitoring unit as to any additional transmitted data set, which may be related to the monitored data set, that is to be transmitted from the remote monitoring unit to the central unit and a time at which the additional transmitted data set is to be transmitted.
- the present invention is therefore based in an architecture where the main body of data is not automatically transmitted from the remote monitoring unit to the central unit. That approach is likely to produce unnecessarily large and unnecessarily frequent data transfers which result in depletion of the batteries of the remote monitoring unit and large transmission-time costs.
- the central unit analyzes the initially transmitted data set, which is usually a reduced data set that is derived from or determined by the monitored data set, to determine whether a more complete data transfer in the form of the additional transmitted data set is required. If so, that transmission is made at a time specified by the central unit.
- the time of transmission may be immediate, as when an emergency condition is sensed, or deferred, as when the additional transmitted data set is needed for the patient history.
- the efficiency of communication is thereby optimized while at the same time meeting the medical requirements for the patient.
- the step of the remote monitoring unit analyzing the monitored data set may be accomplished by comparing at least one element of the derived data set to a warning limit.
- the analysis of the initially transmitted data set may include obtaining a patient history from a memory, and analyzing the initially transmitted data set in relation to the patient history.
- the central unit may instruct the remote monitoring unit to transmit the additional transmitted data set substantially immediately or at a delayed time.
- the additional transmitted data set and the monitored data set may be the same or may not be the same data sets.
- the communications device comprises a radio frequency telephone terminal (such as a cellular or satellite telephone terminal) and a land-line telephone terminal.
- the radio frequency telephone connection may be made at any time, but the land-line telephone terminal is available only when the remote monitoring unit is physically connected to a land line.
- the transmission of the initially transmitted data set which usually is a much smaller amount of data than the monitored data set, may be made over the radio frequency telephone connection.
- the larger additional transmitted data set may be immediately transmitted over the radio frequency telephone connection.
- the central monitoring unit may instruct the remote monitoring unit to store and then transmit the additional transmitted data set at a later time over the land-line telephone terminal when such a connection is available or the radio frequency telephone connection when transmission costs are lower (i.e., off-peak hours).
- This selective transmission approach reduces the amount of data that must be transmitted over a cellular telephone connection or similar expensive communication device.
- This selectivity reduces cellular telephone connect time and charges to the user, and also may significantly increase the lifetime of the remote monitoring unit between battery charging, because establishing and maintaining the cell phone connection constitutes a significant portion of the battery usage of the remote monitoring unit.
- the human resources of the medical personnel at or in communication with the central unit are also better utilized. Only those situations that are more likely to be actual emergencies are brought to the attention of those medical personnel, so that they have more time for such potential actual emergencies.
- FIG. 1 is a block flow diagram of a method for practicing the present invention.
- FIG. 2 is a simplified schematic block diagram of a preferred apparatus with which the present invention may be used.
- FIG. 1 depicts an approach for practicing the present invention.
- a monitoring apparatus is provided, numeral 20 .
- the monitoring apparatus may be of any operable form, and one preferred form of the monitoring apparatus 50 is illustrated in FIG. 2.
- the monitoring apparatus 50 is shown in a simplified form illustrating only those portions that are required to discuss the present invention. More detail of a monitoring apparatus may be found in U.S. Pat. No. 5,959,529, whose disclosure is incorporated by reference.
- the monitoring apparatus 50 includes a remote monitoring unit (RMU) 52 carried by an ambulatory patient, and a central unit (CU) 54 .
- the central unit 54 may be a single computer, but it is more typically a file server or a network.
- Other remote monitoring units that are not “portable” in the sense that they are not carried on the person of the patient but may be at a fixed location in a patient's home or hospital facility, may be used as well.
- a sensor 56 measures a physiological characteristic of a patient, and is typically in contact with the patient. (“Patient” is used in a broad sense, and refers to a person being monitored.) There may be one sensor or more than one sensor 56 , depending upon the parameters of the patient that are of interest.
- operable sensors 56 include a heart monitor sensor, a blood pressure monitor sensor, a temperature monitor sensor, a respiration sensor, a brain wave sensor, a blood chemistry sensor such as a blood glucose sensor or a blood oxygen sensor, a patient position sensor, and a patient activity sensor. Sensors of various types are known in the art, and details of their construction and operation do not form a part of the present invention.
- the senor 56 is in communication with a central processing unit (CPU) 58 of the remote monitoring unit 52 , with intermediate signal conditioning equipment as necessary (not shown here).
- the central processing unit 58 performs analyses of the signals of the sensor 56 , as will be discussed subsequently.
- the central unit 54 includes a central processing unit (CPU) 60 to perform calculations and analyses, as will be discussed subsequently.
- the central unit 54 and its CPU 60 may be of any operable type, such as a dedicated system, a network, or a file server.
- Each CPU 58 and 60 typically includes a microprocessor.
- the remote monitoring unit 52 and the central unit 54 may be placed in two-way communication with each other through a transceiver 62 located in the remote monitoring unit 52 and a communicating transceiver 64 located in the central unit 54 .
- the description that the transceiver is “in” the described device includes the case where the transceiver is not physically within the same structure as the CPU, but is instead in another location but in communication with the CPU.
- the central unit 54 may include a file server in which the CPU 60 is located and a physically separate cellular transceiver 64 with a communication link to the file server and the CPU 60 .
- the transceivers 62 , 64 may include any operable type of communications devices.
- the transceivers 62 , 64 may include a modem to establish communications over a conventional land line for routine communications. They may also include a cellular telephone transceiver to establish communications on an urgent or routine basis.
- the transceivers 62 , 64 may also be equipped for two-way voice communication between the patient and a person at the central unit 54 .
- the transceivers 62 , 64 may interconnect over the internet, with or without land line or cellular links at each end, as well, with the internet having its own communications capabilities.
- the present invention is concerned in part with determining how much data should be transmitted as urgent communications and how much data should be transmitted as routine communications.
- the central unit 54 is provided with an interface to allow human review 66 of recommended actions of the central processing unit 60 , as by the patient's physician.
- the remote monitoring unit 52 obtains a monitored data set for the patient using the sensor(s) 56 , numeral 22 .
- the monitored data set is often fairly voluminous, such as a continuous loop of 24 hours of a cardiograph of the patient in the form of (voltage, time) data pairs.
- the remote monitoring unit 52 analyzes the monitored data set to obtain a derived data set from the monitored data set, numeral 24 .
- the derived data set is typically much smaller in size than the monitored data set, and includes types of data that have been previously found to be significant.
- the derived data set may include, for example, an indication of a specified type of an abnormal heart beat (i.e., a code for the sensed abnormality), a heart rate (number of beats per minute), maximum voltage value, basic wave-shape assessment, and whether patient-specific criteria were violated by the heartbeat waveform.
- the derived data set is obtained from the monitored data set by conventional waveform processing procedures.
- the central processing unit 58 of the remote monitoring unit 52 analyzes the derived data set, typically by comparing the values of the parameters with warning limits previously determined for the patient and provided to the remote monitoring unit 52 or by other suitable approaches. For example, if the heart rate exceeds a heart rate warning limit, the maximum voltage value is greater than a voltage warning limit, and/or the wave shape is not within a waveshape warning limit, the remote monitoring unit 52 may determine that there is a potential emergency with the patient or that data should be transmitted immediately for diagnostic purposes. In that event, the remote monitoring unit 52 determines that communication with the central unit 54 is required immediately, numeral 26 . The remote monitoring unit 52 may instead determine that the data is of interest for inclusion in the patient's centrally stored history, but that there is no emergency at hand.
- the data of interest is marked for transmission at a later time, as in a daily routine transmission.
- the remote monitoring unit 52 may instead determine that the data is of no particular interest. In the majority of situations there is no potential emergency and communications are not required, and the monitoring apparatus then cycles from step 24 back to step 22 and repeats steps 22 and 24 .
- the remote monitoring unit 52 transmits to the central unit 54 an initially transmitted data set, numeral 30 .
- the initially transmitted data set may be related to the monitored data set or unrelated to the monitored data set (as for example information suggesting a sensor failure), the former being the most common.
- the initially transmitted data set may be the same as the derived data set, or it may include different data.
- the initially transmitted data set may also include information from other sensors, such as a respiration rate or blood pressure of the patient.
- the initially transmitted data set is structured to contain the most significant information for decision making and to permit transmission to the central unit 54 in a relatively short time. The central unit 54 therefore has the most significant information needed for further decision making concisely.
- the central processing unit 60 of the central unit 54 analyzes the initially transmitted data set, numeral 32 .
- the central unit 54 often relies on patient history (numeral 34 ) that is stored in the central unit 54 or is obtainable by a further link to the doctor or hospital that is responsible for the patient.
- the central unit 54 may be aided in its decision making by human review and consideration of the situation, numeral 66 of FIG. 2.
- the human review 66 may be conducted by a medical technician or by the patient's physician.
- the analysis step 32 be as fully automated as possible so that a decision may be made quickly regarding the need for further information.
- the analysis and human review at this point are not performed for the purposes of diagnosis, but instead to determine whether more information is required immediately from the remote monitoring unit 52 .
- the central unit 54 determines the subsequent flow of information from the remote monitoring unit 52 and instructs the remote monitoring unit 52 as appropriate, numeral 36 .
- the central unit 54 may, for example, determine that no further information need be transmitted, may determine that more information in the form of an additional transmitted data set is required on an urgent basis, or may determine that more information in the form of the additional transmitted data set is required at a later time.
- the volume and type of data to be transmitted is also determined. In the case where no further information is required, the communication between the remote monitoring unit 52 and the central unit 54 may be immediately terminated, and the remote monitoring unit 52 cycles back to step 22 .
- the communication link remains open and the additional transmitted data set is transmitted from the remote monitoring unit 52 to the central unit 54 immediately, numeral 38 .
- the communication link is terminated as far as the urgent communication is concerned but the data of interest is marked for later transmission.
- the additional transmitted data is transmitted from the remote monitoring unit 52 to the central unit, numeral 40 .
- the additional transmitted information is transmitted with routine transmissions using a telephone land line, which is substantially less expensive than using a cellular telephone link and also is accomplished when the remote monitoring unit is receiving line power so that there is no battery drain.
- the additional transmitted data set selected by the central unit 54 may include the monitored data set, less than the full monitored data set, or more than the monitored data set because, for example, additional information from other sensors is required.
- the present event does not result in a condition of three or more events in the last hour, it still may be desirable to transmit the waveform for the event and the adjacent time periods for the patient history but only at the next routine transmission.
- the PVC count may be maintained by the remote monitoring unit 52 , and contact established with the central unit 54 only when three PVC events are counted in any one-hour period.
Abstract
A patient is monitored using a monitoring apparatus including a remote monitoring unit associated with the patient and having a sensor that measures a physiological characteristic of the patient, a central unit, and a communications device which selectively establishes a communications link between the remote monitoring unit and the central unit. The remote monitoring unit obtains a monitored data set for the patient, analyzes the monitored data set to obtain a derived data set from the monitored data set, and determines from the derived data set that communication with the central unit is required. A communications link is established with the central unit, and the remote monitoring unit transmits to the central unit an initially transmitted data set related to the monitored data set. The central unit analyzes the initially transmitted data set and instructs the remote monitoring unit as to any additional transmitted data set related to the monitored data set that is to be transmitted from the remote monitoring unit to the central unit and a time at which the additional transmitted data set is to be transmitted.
Description
- This invention relates to the transmission of data between a remote monitoring unit and a central unit, and more particularly to the optimization of such data transfer.
- Advances in sensor technology, electronics, and communications have made it possible for physiological characteristics of patients to be monitored even when the patients are ambulatory and not in continuous, direct contact with a hospital monitoring system. For example, U.S. Pat. No. 5,959,529 describes a monitoring system in which the patient carries a remote monitoring unit with associated physiological sensors. The remote monitoring unit conducts a continuous monitoring of one or more physiological characteristics of the patient according to the medical problem of the patient, an example being the heartbeat and its waveform.
- Under prescribed conditions, the remote monitoring unit contacts a central unit to communicate information on the condition of the patient. For example, if the remote monitoring unit determines that the monitored physiological data suggests that the patient may be in distress or in an emergency, it may immediately and automatically transfer the monitored data to the central unit over a cellular telephone or comparable communications device. The central unit automatically, or in conjunction with medical personnel who are stationed at or are in contact with the central unit, analyzes the data and coordinates the provision of assistance to the patient when necessary. Where the analysis of the transmitted data indicates that there is no patient situation requiring immediate attention, the data is stored and may also be forwarded to the patient's physician so that treatments may be altered.
- While operable, this approach may in some cases be wasteful of the battery power of the remote monitoring unit and require the expenditure of too much data transfer time over the cellular telephone system with its associated charges. The time of the medical personnel may also be used inefficiently.
- There is a need for an improved approach for the control of data transfers between the remote monitoring unit and the central unit. The present invention fulfills this need, and further provides related advantages.
- The present invention provides an approach for monitoring a patient and providing support to the patient. The present approach adopts a new data transfer architecture with improved selectivity of data transmission but retention of the data accumulation capability to build the patient history and also the emergency capability to assist the patient on an urgent basis when needed. The battery power of the remote monitoring unit is thereby used more judiciously, the cellular telephone connect time is reduced, and medical personnel time is better managed.
- In accordance with the invention, a method of monitoring a patient comprises providing a monitoring apparatus including a remote monitoring unit associated with the patient. The remote monitoring unit includes a sensor that measures a physiological characteristic of the patient such as a cardiogram, a central unit, and a communications device which selectively establishes a communications link between the remote monitoring unit and the central unit. The remote monitoring unit obtains a monitored data set for the patient, analyzes the monitored data set to obtain a derived data set from the monitored data set, and determines from the derived data set that communication with the central unit is required. A communications link is established with the central unit, and the remote monitoring unit transmits to the central unit an initially transmitted data set related to the monitored data set. The central unit analyzes the initially transmitted data set and instructs the remote monitoring unit as to any additional transmitted data set, which may be related to the monitored data set, that is to be transmitted from the remote monitoring unit to the central unit and a time at which the additional transmitted data set is to be transmitted.
- The present invention is therefore based in an architecture where the main body of data is not automatically transmitted from the remote monitoring unit to the central unit. That approach is likely to produce unnecessarily large and unnecessarily frequent data transfers which result in depletion of the batteries of the remote monitoring unit and large transmission-time costs. Instead, the central unit analyzes the initially transmitted data set, which is usually a reduced data set that is derived from or determined by the monitored data set, to determine whether a more complete data transfer in the form of the additional transmitted data set is required. If so, that transmission is made at a time specified by the central unit. The time of transmission may be immediate, as when an emergency condition is sensed, or deferred, as when the additional transmitted data set is needed for the patient history. The efficiency of communication is thereby optimized while at the same time meeting the medical requirements for the patient.
- The step of the remote monitoring unit analyzing the monitored data set may be accomplished by comparing at least one element of the derived data set to a warning limit. The analysis of the initially transmitted data set may include obtaining a patient history from a memory, and analyzing the initially transmitted data set in relation to the patient history. The central unit may instruct the remote monitoring unit to transmit the additional transmitted data set substantially immediately or at a delayed time. The additional transmitted data set and the monitored data set may be the same or may not be the same data sets.
- In one embodiment, the communications device comprises a radio frequency telephone terminal (such as a cellular or satellite telephone terminal) and a land-line telephone terminal. The radio frequency telephone connection may be made at any time, but the land-line telephone terminal is available only when the remote monitoring unit is physically connected to a land line. The transmission of the initially transmitted data set, which usually is a much smaller amount of data than the monitored data set, may be made over the radio frequency telephone connection. Upon analysis at the central unit, if there appears to be the possibility of an emergency wherein more data is needed immediately, the larger additional transmitted data set may be immediately transmitted over the radio frequency telephone connection. On the other hand, where the central unit determines that there is not an emergency but that it would be useful to have the additional transmitted data set for future reference as a part of the patient history, the central monitoring unit may instruct the remote monitoring unit to store and then transmit the additional transmitted data set at a later time over the land-line telephone terminal when such a connection is available or the radio frequency telephone connection when transmission costs are lower (i.e., off-peak hours).
- This selective transmission approach, wherein data transmission from the remote monitoring unit is not automatic but instead is under control of the central unit, reduces the amount of data that must be transmitted over a cellular telephone connection or similar expensive communication device. This selectivity reduces cellular telephone connect time and charges to the user, and also may significantly increase the lifetime of the remote monitoring unit between battery charging, because establishing and maintaining the cell phone connection constitutes a significant portion of the battery usage of the remote monitoring unit. The human resources of the medical personnel at or in communication with the central unit are also better utilized. Only those situations that are more likely to be actual emergencies are brought to the attention of those medical personnel, so that they have more time for such potential actual emergencies.
- Other features and advantages of the present invention will be apparent from the following more detailed description of the preferred embodiment, taken in conjunction with the accompanying drawings, which illustrate, by way of example, the principles of the invention. The scope of the invention is not, however, limited to this preferred embodiment.
- FIG. 1 is a block flow diagram of a method for practicing the present invention; and
- FIG. 2 is a simplified schematic block diagram of a preferred apparatus with which the present invention may be used.
- FIG. 1 depicts an approach for practicing the present invention. A monitoring apparatus is provided,
numeral 20. The monitoring apparatus may be of any operable form, and one preferred form of themonitoring apparatus 50 is illustrated in FIG. 2. Themonitoring apparatus 50 is shown in a simplified form illustrating only those portions that are required to discuss the present invention. More detail of a monitoring apparatus may be found in U.S. Pat. No. 5,959,529, whose disclosure is incorporated by reference. - The
monitoring apparatus 50 includes a remote monitoring unit (RMU) 52 carried by an ambulatory patient, and a central unit (CU) 54. The central unit 54 may be a single computer, but it is more typically a file server or a network. Other remote monitoring units, that are not “portable” in the sense that they are not carried on the person of the patient but may be at a fixed location in a patient's home or hospital facility, may be used as well. Asensor 56 measures a physiological characteristic of a patient, and is typically in contact with the patient. (“Patient” is used in a broad sense, and refers to a person being monitored.) There may be one sensor or more than onesensor 56, depending upon the parameters of the patient that are of interest. Examples ofoperable sensors 56 include a heart monitor sensor, a blood pressure monitor sensor, a temperature monitor sensor, a respiration sensor, a brain wave sensor, a blood chemistry sensor such as a blood glucose sensor or a blood oxygen sensor, a patient position sensor, and a patient activity sensor. Sensors of various types are known in the art, and details of their construction and operation do not form a part of the present invention. - In either event, the
sensor 56 is in communication with a central processing unit (CPU) 58 of theremote monitoring unit 52, with intermediate signal conditioning equipment as necessary (not shown here). Thecentral processing unit 58 performs analyses of the signals of thesensor 56, as will be discussed subsequently. Similarly, the central unit 54 includes a central processing unit (CPU) 60 to perform calculations and analyses, as will be discussed subsequently. (As noted, the central unit 54 and its CPU 60 may be of any operable type, such as a dedicated system, a network, or a file server. EachCPU 58 and 60 typically includes a microprocessor.) - The
remote monitoring unit 52 and the central unit 54 may be placed in two-way communication with each other through atransceiver 62 located in theremote monitoring unit 52 and a communicatingtransceiver 64 located in the central unit 54. (The description that the transceiver is “in” the described device includes the case where the transceiver is not physically within the same structure as the CPU, but is instead in another location but in communication with the CPU. Thus, for example, the central unit 54 may include a file server in which the CPU 60 is located and a physically separatecellular transceiver 64 with a communication link to the file server and the CPU 60.) Thetransceivers transceivers transceivers human review 66 of recommended actions of the central processing unit 60, as by the patient's physician. - Returning to the discussion of FIG. 1, the
remote monitoring unit 52 obtains a monitored data set for the patient using the sensor(s) 56,numeral 22. The monitored data set is often fairly voluminous, such as a continuous loop of 24 hours of a cardiograph of the patient in the form of (voltage, time) data pairs. - The
remote monitoring unit 52 analyzes the monitored data set to obtain a derived data set from the monitored data set, numeral 24. The derived data set is typically much smaller in size than the monitored data set, and includes types of data that have been previously found to be significant. The derived data set may include, for example, an indication of a specified type of an abnormal heart beat (i.e., a code for the sensed abnormality), a heart rate (number of beats per minute), maximum voltage value, basic wave-shape assessment, and whether patient-specific criteria were violated by the heartbeat waveform. The derived data set is obtained from the monitored data set by conventional waveform processing procedures. - The
central processing unit 58 of theremote monitoring unit 52 analyzes the derived data set, typically by comparing the values of the parameters with warning limits previously determined for the patient and provided to theremote monitoring unit 52 or by other suitable approaches. For example, if the heart rate exceeds a heart rate warning limit, the maximum voltage value is greater than a voltage warning limit, and/or the wave shape is not within a waveshape warning limit, theremote monitoring unit 52 may determine that there is a potential emergency with the patient or that data should be transmitted immediately for diagnostic purposes. In that event, theremote monitoring unit 52 determines that communication with the central unit 54 is required immediately, numeral 26. Theremote monitoring unit 52 may instead determine that the data is of interest for inclusion in the patient's centrally stored history, but that there is no emergency at hand. In that case, the data of interest is marked for transmission at a later time, as in a daily routine transmission. Theremote monitoring unit 52 may instead determine that the data is of no particular interest. In the majority of situations there is no potential emergency and communications are not required, and the monitoring apparatus then cycles fromstep 24 back to step 22 and repeatssteps - Where it has been determined that communication is required immediately, a communications link is immediately established through the
transceivers remote monitoring unit 52 and the central unit 54,numeral 28. If it is not possible to establish communications through a land line, then there is an attempt to establish the more expensive and less dependable radio frequency cellular link. - The
remote monitoring unit 52 transmits to the central unit 54 an initially transmitted data set, numeral 30. The initially transmitted data set may be related to the monitored data set or unrelated to the monitored data set (as for example information suggesting a sensor failure), the former being the most common. The initially transmitted data set may be the same as the derived data set, or it may include different data. For example, the initially transmitted data set may also include information from other sensors, such as a respiration rate or blood pressure of the patient. The initially transmitted data set is structured to contain the most significant information for decision making and to permit transmission to the central unit 54 in a relatively short time. The central unit 54 therefore has the most significant information needed for further decision making concisely. - The central processing unit60 of the central unit 54 analyzes the initially transmitted data set, numeral 32. In performing this analysis, the central unit 54 often relies on patient history (numeral 34) that is stored in the central unit 54 or is obtainable by a further link to the doctor or hospital that is responsible for the patient. The central unit 54 may be aided in its decision making by human review and consideration of the situation, numeral 66 of FIG. 2. The
human review 66 may be conducted by a medical technician or by the patient's physician. However, at this stage it is preferred that theanalysis step 32 be as fully automated as possible so that a decision may be made quickly regarding the need for further information. The analysis and human review at this point are not performed for the purposes of diagnosis, but instead to determine whether more information is required immediately from theremote monitoring unit 52. - From the information provided to it by the initially transmitted data set and from other sources such as the patient history, the central unit54 determines the subsequent flow of information from the
remote monitoring unit 52 and instructs theremote monitoring unit 52 as appropriate, numeral 36. The central unit 54 may, for example, determine that no further information need be transmitted, may determine that more information in the form of an additional transmitted data set is required on an urgent basis, or may determine that more information in the form of the additional transmitted data set is required at a later time. The volume and type of data to be transmitted is also determined. In the case where no further information is required, the communication between theremote monitoring unit 52 and the central unit 54 may be immediately terminated, and theremote monitoring unit 52 cycles back to step 22. In the case where further information is required on an urgent basis, the communication link remains open and the additional transmitted data set is transmitted from theremote monitoring unit 52 to the central unit 54 immediately, numeral 38. In the case where further information is required at a later time such as at the time of routine data transmissions, the communication link is terminated as far as the urgent communication is concerned but the data of interest is marked for later transmission. At a later delayed time, such as at the time of routine data transmissions for the day, the additional transmitted data is transmitted from theremote monitoring unit 52 to the central unit, numeral 40. In a typical case, the additional transmitted information is transmitted with routine transmissions using a telephone land line, which is substantially less expensive than using a cellular telephone link and also is accomplished when the remote monitoring unit is receiving line power so that there is no battery drain. The additional transmitted data set selected by the central unit 54 may include the monitored data set, less than the full monitored data set, or more than the monitored data set because, for example, additional information from other sensors is required. - An example is helpful in illuminating the role of the central unit. If the doctor in charge of the patient has instructed that fewer than three premature ventricular contraction (PVC) events per hour is not of concern, but that three or more events per hour is of sufficient concern to require more information on an urgent basis, the
remote monitoring unit 52 contacts the central unit upon the occurrence of each such event. The central unit 54 consults the patient history, which contains a running listing of the occurrence of such events. If the present event is found to be the third event in the last hour, then the central unit 54 instructs theremote monitoring unit 52 to transmit the additional transmitted data set on an urgent basis. If the present event does not result in a condition of three or more events in the last hour, it still may be desirable to transmit the waveform for the event and the adjacent time periods for the patient history but only at the next routine transmission. (Alternatively, the PVC count may be maintained by theremote monitoring unit 52, and contact established with the central unit 54 only when three PVC events are counted in any one-hour period.) - The advantages of the present approach are illustrated in another example. By making decisions based on the initially transmitted data set, it may be necessary to maintain a cellular connection for at most a minute. On the other hand, if the entire monitored data set were automatically transmitted from the
remote monitoring unit 52 to the central unit 54, the time required might be on the order of several minutes of cellular connection time to transmit each 5 minutes of the cardiogram. This connection results in a significant drain on the battery of the remote monitoring unit and extra cellular connection time and cost, which are to be avoided if possible. Where it is judged that there is an urgent need for the additional transmitted data set because the patient may be in danger or the data is of immediate diagnostic value, the cellular link is maintained and the full additional transmitted data set is communicated as necessary so that the patient may be aided. - Although a particular embodiment of the invention has been described in detail for purposes of illustration, various modifications and enhancements may be made without departing from the spirit and scope of the invention. Accordingly, the invention is not to be limited except as by the appended claims.
Claims (41)
1. (Canceled)
2. A system comprising:
a remote monitoring unit including:
a sensor to measure a physiological characteristic of a heart of a patient,
a first data processing unit to analyze the sensor measurements of the physiological characteristic to determine if communication with a central unit is desired, and
a first communications device to communicate with the central unit in response to prompting by the first data processing unit, the first communications device to transmit data corresponding to the sensor measurements; and
a central unit including:
a second data processing unit to receive the data communicated from the remote monitoring unit and to identify additional data to be transmitted by the remote monitoring unit, and
a second communications device to communicate the identity of the additional data to the remote monitoring unit.
3. The system of claim 2 , wherein:
the second data processing unit is configured to identify a time when the additional data is to be transmitted by the remote monitoring unit; and
the second communications device is configured to communicate the time to the remote monitoring unit.
4. The system of claim 2 , wherein the remote monitoring unit further includes a data storage device configured to store data including
additional data marked for later transmission to a central unit, and
immediate data for current transmission to the central unit.
5. The system of claim 2 , wherein the first communications device is configured to transmit a code for a cardiac abnormality to the central unit.
6. The system of claim 2 , wherein the remote monitoring unit is configured to identify the immediate measurement information using a patient-specific warning limit.
7. The system of claim 2 , wherein the first communications device comprises:
a wireless communications device configured to transmit data over a wireless connection to the central unit; and
a wired communications device configured to transmit data over a wired connection to the central unit.
8. The system of claim 2 , wherein the sensor is configured to measure a cardiogram of the patient.
9. The system of claim 2 , wherein the remote monitoring unit further comprises at least one other sensor configured to measure another physiological characteristic of the patient.
10. The system of claim 2 , wherein the central unit further comprises a patient history storage to store a personal history of the patient.
11. The system of claim 2 , wherein the central unit further comprises a communications link to a human for review of the data communicated from the remote monitoring unit.
12. A remote monitoring device comprising:
a sensor configured to measure a physiological characteristic of a heart of a patient;
a data processing unit configured to analyze the sensor measurements of the physiological characteristic; and
a data storage device including:
prior measurement information marked for later transmission to a central unit,
immediate measurement information for current transmission to the central unit, and
a warning limit used by the data processing unit to identify the immediate measurement information.
13. The remote monitoring device of claim 12 , wherein the prior measurement information comprises sensor measurements marked for later transmission.
14. The remote monitoring device of claim 12 , wherein the immediate measurement information comprises data derived from current sensor measurements.
15. The remote monitoring device of claim 14 , wherein the data derived from current sensor measurements comprises a heart rate derived from current sensor measurements.
16. The remote monitoring device of claim 12 , wherein the immediate measurement information comprises a code for a cardiac abnormality.
17. The remote monitoring device of claim 12 , wherein the warning limit comprises a patient-specific warning limit previously determined for the patient.
18. The remote monitoring device of claim 12 , further comprising a communications device configured to communicate measurement information to the central unit.
19. The remote monitoring device of claim 12 , wherein the data storage device further includes adjacent measurement information that relates to sensor measurements adjacent in time to the immediate measurement information.
20. The remote monitoring device of claim 12 , wherein the data storage device further includes time information identifying a time for transmission of the prior measurement information to the central unit.
21. The remote monitoring device of claim 12 , wherein the sensor is configured to measure a cardiogram of the patient.
22. The remote monitoring device of claim 12 , further comprising at least one other sensor configured to measure another physiological characteristic of the patient.
23. A remote monitoring device, the device including instructions operable to cause the device to perform operations comprising:
receiving sensor measurements relating to a physiological characteristic of a heart of a patient;
transmitting information related to the received sensor measurements to a central unit;
receiving a request for additional information from the central unit; and
transmitting the requested additional information to the central unit.
24. The device of claim 23 further including instructions operable to cause the device to perform operations comprising receiving a request for additional information related to the sensor measurements from the central unit.
25. The device of claim 23 further including instructions operable to cause the device to perform operations comprising analyzing the sensor measurements to determine if the transmission of the information to the central unit is warranted.
26. The device of claim 25 further including instructions operable to cause the device to perform operations comprising determining if the transmission of the information to the central unit is warranted using a patient-specific warning limit to analyze the sensor measurements.
27. The device of claim 23 further including instructions operable to cause the device to perform operations comprising deriving a data set from the received sensor measurements.
28. The device of claim 27 further including instructions operable to cause the device to perform operations comprising transmitting the derived data set to the central unit.
29. The device of claim 23 further including instructions operable to cause the device to perform operations comprising:
receiving, from the central unit, a time for the transmission of the additional information to the central unit; and
delaying the transmission of the additional information until the received transmission time.
30. The device of claim 23 further including instructions operable to cause the device to perform operations comprising receiving a cardiogram of the patient.
31. A method comprising:
receiving, from a remote unit, information related to an electrocardiograph measurement on a patient; determining that additional information absent from the received information warrants communication from the remote unit;
conveying the determination to the remote unit; and
receiving the additional information from the remote unit.
32. The method of claim 31 , wherein conveying the determination to the remote unit comprises identifying the additional information to the remote unit.
33. The method of claim 31 , wherein conveying the determination to the remote unit comprises identifying a time for transmission of the additional information to the remote unit.
34. The method of claim 31 , wherein determining that the additional information warrants communication comprises deciding that additional information related to the electrocardiograph measurement warrants communication.
35. The method of claim 31 , wherein deciding that the additional information warrants communication comprises receiving human input regarding the decision.
36. The method of claim 31 , further comprising analyzing the received information to determine whether an emergency situation exists.
37. The method of claim 36 , wherein analyzing the received information comprises consulting a medical history of the patient.
38. The method of claim 36 , wherein analyzing the received information comprises analyzing the received information in light of other information related to electrocardiograph measurements on the patient.
39. The method of claim 31 , wherein receiving the additional information comprises receiving the additional information from the remote unit at a later time.
40. The method of claim 31 , wherein:
receiving information related to the electrocardiograph measurement comprises receiving the information over a first communication link; and
receiving the additional information comprises receiving the additional information over a second communication link.
41. The method of claim 31 , wherein receiving information related to the electrocardiograph measurement comprises receiving information derived from the electrocardiograph measurement.
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Also Published As
Publication number | Publication date |
---|---|
EP1381310A1 (en) | 2004-01-21 |
CA2444884A1 (en) | 2002-10-31 |
DE60234251D1 (en) | 2009-12-17 |
US20020156384A1 (en) | 2002-10-24 |
JP3738009B2 (en) | 2006-01-25 |
JP2004532070A (en) | 2004-10-21 |
AU2002338434B2 (en) | 2006-05-04 |
KR20040014509A (en) | 2004-02-14 |
WO2002085201A1 (en) | 2002-10-31 |
US6694177B2 (en) | 2004-02-17 |
CA2444884C (en) | 2009-06-30 |
CN1512850A (en) | 2004-07-14 |
EP1381310B1 (en) | 2009-11-04 |
USRE43767E1 (en) | 2012-10-23 |
ES2333852T3 (en) | 2010-03-02 |
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