WO1998030145A1 - Cable d'interface d'electrocardiogramme universel - Google Patents

Cable d'interface d'electrocardiogramme universel Download PDF

Info

Publication number
WO1998030145A1
WO1998030145A1 PCT/AU1998/000014 AU9800014W WO9830145A1 WO 1998030145 A1 WO1998030145 A1 WO 1998030145A1 AU 9800014 W AU9800014 W AU 9800014W WO 9830145 A1 WO9830145 A1 WO 9830145A1
Authority
WO
WIPO (PCT)
Prior art keywords
ecg
cable
data
universal
communication
Prior art date
Application number
PCT/AU1998/000014
Other languages
English (en)
Inventor
Bruce Richard Satchwell
Andrew Michael Walsh
Original Assignee
Micromedical Industries Limited
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
Application filed by Micromedical Industries Limited filed Critical Micromedical Industries Limited
Priority to AU54689/98A priority Critical patent/AU749181B2/en
Publication of WO1998030145A1 publication Critical patent/WO1998030145A1/fr

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/24—Detecting, measuring or recording bioelectric or biomagnetic signals of the body or parts thereof
    • A61B5/316—Modalities, i.e. specific diagnostic methods
    • A61B5/318—Heart-related electrical modalities, e.g. electrocardiography [ECG]
    • A61B5/327—Generation of artificial ECG signals based on measured signals, e.g. to compensate for missing leads
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/24—Detecting, measuring or recording bioelectric or biomagnetic signals of the body or parts thereof
    • A61B5/30—Input circuits therefor
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/24—Detecting, measuring or recording bioelectric or biomagnetic signals of the body or parts thereof
    • A61B5/30—Input circuits therefor
    • A61B5/307—Input circuits therefor specially adapted for particular uses
    • A61B5/308—Input circuits therefor specially adapted for particular uses for electrocardiography [ECG]
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/24—Detecting, measuring or recording bioelectric or biomagnetic signals of the body or parts thereof
    • A61B5/30—Input circuits therefor
    • A61B5/301—Input circuits therefor providing electrical separation, e.g. by using isolating transformers or optocouplers
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/24—Detecting, measuring or recording bioelectric or biomagnetic signals of the body or parts thereof
    • A61B5/30—Input circuits therefor
    • A61B5/303—Patient cord assembly, e.g. cable harness
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/72—Signal processing specially adapted for physiological signals or for diagnostic purposes
    • A61B5/7232—Signal processing specially adapted for physiological signals or for diagnostic purposes involving compression of the physiological signal, e.g. to extend the signal recording period

Definitions

  • the present invention relates to a universal ECG interface cable and, more particularly, to such a device adapted for acquisition of ECG signals from a patient and their communication to personal computers and like devices using standardised communication interfaces and protocols.
  • Electrodes are applied to the body to obtain either single or multiple channel ECGs as the case may be and the raw signals are fed to a processing device.
  • the electrodes can be directly attached to the processing device as, for example, described in the applicant's US patent US5123419 the specification of which is incorporated herein by cross reference.
  • the signals from the electrodes are conducted via cable to a separate, special purpose processing and display device which incorporates the necessary isolation to meet the electrical requirements of accepted electromedical safety standards such as, for example, IEC601.1 and the specific ECG standard IEC.601.2.25. It is desirable to harness the power of the mass produced personal computer or like devices for at least the display and storage of ECG wave forms and the analysis thereof.
  • universal ECG interface cable denotes that the device can accept from a patient and transmit to a patient commonly accepted waveforms associated with ECG acquisition and can also communicate with computers and like data processing devices by means of a universal communications link, the universal link being, a common form of data communication means to the point it can be described as universal.
  • Current computer communication links which would qualify as “universal links” include the RS232 serial link, the parallel port printer link and the IRDA infrared based serial link.
  • the interface cable or device is thus "universal" in that it communicates to and from a patient in a manner as generally defined in the standards such as IEC601.2.5 and ANSI/AAMI EC 11-1991 and also communicates with personal computers and the like through industry standard and commonly available links and link protocols such as the universally recognised RS232C link. It will thus be noted that embodiments of the device of the present invention necessarily require at least a cable for connection to a patient and a cable or link for connection/communication with a personal computer. Overall, therefore the device of the present invention takes the form of a "cable".
  • the cable of the present invention is relatively sophisticated and incorporates signal processing means which are housed in a bulbous portion of the cable.
  • the term "cable” is to be defined quite broadly so as to encompass housings for signal processing equipment and signal processing equipment which are in communication with conductors within the cable and which give the cable its ability to act as an interface device.
  • Embodiments of the present invention can be utilised as part of the patient data acquisition apparatus and/or the patient data transmission apparatus of the applicant's co-pending international application PCT/AU97/00821, the specification of which application is incorporated herein by way of cross-reference.
  • a universal ECG interface cable device for a universal ECG interface cable comprising i. patient cable communication means adapted to connect to and be in electrical communication with ECG patient cables; ii. electrically isolated signal processing means adapted to preprocess the ECG signals received by said patient cable communication means; iii. personal computer communication means adapted to receive preprocessed ECG signals from said signal processing means and transmit said preprocessed ECG signals in standard format to a universal communications port of a personal computer or like device.
  • said electrically isolated signal processing means comprises a microprocessor in communication with isolation means.
  • said isolation means includes means to receive and isolate a source of remotely communicated electrical power.
  • said source of electrical power comprises electrical power available from said universal communications port.
  • said source of power comprises a storage battery.
  • said universal communication port comprises one of a serial communications port; a parallel communications port or an IrDA infrared link port.
  • microprocessor is in communication with memory means thereby to allow onboard storage within said interface device of ECG data, protocol data and analysis data and algorithms.
  • protocol data includes error correcting hand shaking protocol data thereby to allow error correction of data transmitted to said universal communications port from said interface device.
  • Preferably said source of electrical power is processed through a voltage regulator prior to processing by a voltage doubling circuit.
  • said signal processing means utilises a peak picking algorithm to compress digital data for transmission by said computer communication means.
  • said interface cable further includes buffering means comprising memory means adapted to store for a predeterminded period of time ECG waveform data prior to transmission via said personal computer communication means .
  • a method of converting analog ECG signals to digital signals for subsequent transmission via a universal port to a data processing device such as a personal computer comprising utilising an ECG interface cable device comprising : i. patient cable communication means adapted to connect to and be in electrical communication with ECG patient cables; ii. electrically isolated signal processing means adapted to preprocess the ECG signals received by said patient cable communication means; iii. personal computer communication means adapted to receive preprocessed ECG signals from said signal processing means and transmit said preprocessed ECG signals in standard format to a universal communications port of a personal computer or like device.
  • said ECG interface cable device includes buffering means in the form of memory means adapted to store ECG data prior to transmission via said personal computer communication means.
  • said voltage regulator is selected to provide maximum power transfer at minimum expected input voltage from said source of electrical power.
  • said interface cable device further includes shunt means adapted to shunt large voltages experienced on said ECG patient cables.
  • a universal ECG interface cable comprising a universal ECG interface cable device as described above; said cable further including an ECG patient cable in communication with said patient cable communication means; said cable further including a link adapted to communicate at least ECG data between said personal computer communication means and said universal communications port of said personal computer or like device.
  • Fig. 1 is a perspective view of a universal ECG interface cable device according to a first embodiment of the invention
  • Fig. 2 is a block diagram of the cable device of Fig. 1 connected to a portable personal computer
  • Fig. 3 is a block diagram of the principles of isolation employed in the interface cable device of Fig. 1
  • Fig. 4 is a block diagram of the main processing components in the interface cable device of Fig. 1,
  • Fig. 5 is an electrical schematic diagram of a typical ECG waveform pre-processing circuit
  • Fig. 6 illustrates a particular method of determining a "leads off" condition for the interface cable device of Fig. 1.
  • Fig. 7 is a schematic diagram of a specific implementation of the ECG interface device according to a second embodiment of the invention
  • Fig. 8 illustrates body drive signal generation and sampling ticks as generated by the cable device of Fig. 7,
  • Fig. 9 lists commands for actuation of the cable device of Fig. 7 in tabular form.
  • Fig. 10 is a diagram of a "peak picking" compression algorithm utilised in the second embodiment of Fig. 7. DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS 1. First Embodiment
  • a universal ECG interface cable device 10 It comprises a substantially circular in cross section case 11 having a series of ECG cable connectors 12 arrayed along an edge thereof and, in this example, a serial cable 13 extending from an edge surface diametrically opposed about case 11 from the connectors 12.
  • the interface cable device 10 is adapted to receive patient 16 ECG electrode cables connected at a first end to a patient and at the other end into the ECG cable connectors 12 on the case 11.
  • the serial cable 13 is adapted for direct connection to a serial port on a personal computer (not shown in Fig. 1) .
  • Fig. 2 illustrates the serial cable 13 connected to a portable personal computer 14 of the type adapted to rely on an internal power supply such as supplied by batteries.
  • a number of patient cables 15 connecting from a patient 16 via electrodes 17 to the ECG cable connectors 12 connecting into the electronic acquisition unit 18 housed within case 11.
  • the electronic acquisition unit 18 includes isolation devices as illustrated in Fig. 3 adapted to provide electrical isolation between the RS232 signals 19 within serial cable 13 and the patient cables 15.
  • the serial channel isolator 20 comprises opto isolators 21 for the data signals RXD and TXD. It further includes an isolated DC-DC converter circuit 22 incorporating an isolation transformer (not shown) for the power supply and other signals 19.
  • Fig. 4 is a block diagram of the main processing components within electronic acquisition unit 18 and shows serial channel isolator 20 communicating with microprocessor and A/D converter unit 23 which, in turn, communicates with patient cables 15 via amplifiers 24 and defibrillator protection device 25.
  • Typical amplifier circuits are illustrated in Fig. 5 and are available in the literature - see for example "Amplifiers for Bio-Electric Events: A Design with a Minimal Number of Parts" by A.C. Metting Van Rijn et al in Medical & Biological Engineering & Computing, May 1994 page. 305.
  • a triangle wave generator 26 superimposes a triangular wave on the driven leg drive circuit 27 for the purpose of communicating a "leads off” condition to microprocessor 23.
  • the method of operation of this "leads off" facility will now be described in greater detail with reference to Fig. 6.
  • the standard technique for driving the right leg is used (see A.C. Metting Van Rijn) with addition of a 1000Hz triangle wave superimposed on the normal RLD signal .
  • This triangle wave will appear as a common mode signal on all electrode inputs, and is of a sufficiently low level (lOmV) to be of little concern if the electrodes are all well connected to the patient's body.
  • Sampling of a particular lead is performed at identical times in the positive and negative halves of the triangle wave. When successive samples are averaged, the small residual common mode signal due to the generated triangle wave cancels out, resulting in a 2msec (500hZ) sampled system for each lead.
  • the data processing and programmable capability of the universal ECG interface cable 10 derives primarily and importantly from inclusion of microprocessor 23 together with memory 28 within the electronic acquisition unit 18.
  • the ECG interface cable device 10 provides diagnostic quality multi-lead ECG in digital serial RS/232 compatible form to meet all aspects of both AAMI ECU and IEC601 (IEC601.1 and IEC601.2.25 (class BF or CF) ) . It is intended to be compact, inexpensive and capable of transmitting diagnostic quality ECG via a standard serial lead (RS232) or standard infrared link (IrDA) to any general computer and associated software. Note that the ECG standards include both conventional 12-lead ECG systems and more specialised lead sets used in vectorcardiography.
  • the unit consists of multiple patient cables (for connection to a person's body) entering a compact enclosure, containing electronics that processes and digitises the ECG signals, converting the data to serial form for transmission down a separate cable that connects to a computer's serial port.
  • Figure 1 shows an enclosure for a 10 patient electrode, standard 12-lead ECG system.
  • the use of active electronics in the acquisition unit 18 facilitates the reduction of electrical noise via the use of short patient cables.
  • serial communication is bidirectional for flexibility and electrically isolated for patient and operator safety.
  • communication can be by the naturally isolated, wireless IrDA method of serial data communication.
  • Power for the device may be derived either by battery, or via an isolation transformer in the serial cable. The latter technique, in particular, requires extremely low power consumption in the system electronics .
  • microprocessor 23 becomes microprocessor 123 in the second embodiment.
  • the major components are ECG cable connectors 112 connecting to amplifiers 124 which feed to microprocessor and analog to digital converter 123.
  • Serial output from the microprocessor and analog digital converter assembly 123 to serial cable 113 is buffered by serial channel isolator 120.
  • the DC to DC converter circuit 122 derives power from the DTR and RTS lines of serial cable 113. DTR and RTS are shorted together to minimise serial impedance which would decrease efficiency. They can vary 5.5V - 10V (no load voltage) .
  • the major problems would be expected at the low end of the range .
  • a minimum no load input voltage is expected to be about 6V.
  • the voltage regulator is selected so that maximum output power with a load would occur when the load brings the output voltage to about 3V.
  • the MAX8863SEUK-T is a 2.84V ultra low dropout regulator. With the isolation transformer shown, VCC will be regulated to about 3.5V.ISOVCC is a doubled version of the 2.84V supply ie. 5.5V (with diode drop) . This supplies the CMOS inverter that drives RXD. ie. RXD is 0 or 5.5V, which is compatible with virtually all RS232 inputs.
  • the optiosolators are configured as normally OFF to save power when not transmitting.
  • shunt circuit 42 in Fig. 7, which circuit comprises input resistor Rl, shunt device comprising gas discharge tube Gl and second voltage drop resistor R2. This circuit acts to prevent high voltages such as those arising during defibrillation from reaching amplifiers 124.
  • Rl is a 10K solid carbon composition resistor 0.5Wats
  • R2 is a standard 0.125W carbon film resistor
  • Gl is a gas discharge tube which arcs at approximately 100 volts.
  • Resistor Rl should be a solid carbon composition resistor because of the relatively large peak currents of approximately 0.5amp. This arrangement minimises the possibility of fusing of resistor Rl . Expected peak current in resistor R2 should only be about 10mA, hence it may be of carbon or metal film construction.
  • FIG. 7 A schematic diagram of a device 40 according to a second embodiment is shown in Fig. 7.
  • the device 40 connects to a person via the 10 electrode cables: LL, LA, RA, RL, VI, V2, V3, V4 , V5 , V6.
  • ECG information is to be sent via a serial cable 113 to either a specialised device such as described in US5123419 or as currently marketed by the applicant under the trade mark BIOLOG or a general purpose computing device loaded with an appropriate program for processing the serial data and displaying the ECG waveforms and related data.
  • additional memory can be connected to the microprocessor and analog to digital converter assembly 123.
  • Vi' Vi - LL, for 1 an integer from 1 to 6 inclusive. Leads marked with a ' are relative to the left leg electrode.
  • the standard 12 leads are given by:
  • the shield drive has been disconnected in this version to prevent instability.
  • the shield is connected to analog ground instead.
  • Amplifier UlA works as a conventional integrator of the body reference signal, derived from the LL signal. In fact, the circuit should behave as a conventional RL drive circuit with U1B removed. If the processor toggles pin 36 at 1000Hz UlA will integrate this square wave into a triangle wave, and drive the body with it. Note that as the body forms part of a negative feedback loop, the integrator UlA will attempt to reduce this triangular signal to zero. To prevent this from occurring, it is necessary to also subtract a similar triangular wave from the body reference signal . This is done by U1B (an integrator similar to UlA) . The amplitude of the triangle wave applied to the body is set to about 6mV p-p. This triangle wave appears as a common mode signal on all electrodes.
  • each input signal will contain a small amount of residual 500Hz ripple in normal operation. If an electrode becomes detached, the 500Hz body drive signal is no longer a common mode signal and will be amplified by the huge differential gain of the stage. This is easy to detect on any lead. Note that the 1000 Hz ECG sampling is synchronous with the normal 500Hz ripple, so it should be possible to remove this interference from the ECG data. If two successive samples are added, the positive and negative offsets from zero will be equal, so will cancel each other. If these offsets are beyond a certain threshold the lead can considered to be off. The resulting sampling rate will be 500Hz.
  • the amplitude of the sawtooth should be selected to be an absolute minimum to enable reliable leads on/off detection. See figure 6: A 1000Hz sampling interrupt must be established in the processor. Pin 36 is toggled every tick. All leads are sampled every tick. The amplitude of the sawtooth may be calculated for each lead. If the sawtooth amplitude deviates significantly from the average (gets larger) the electrode contact will be poor and leads off can be signalled for that lead. 3.
  • the device will basically have two modes: command mode and acquisition mode.
  • the default mode on reset is command mode. In this state the device is waiting for instructions from the serial port .
  • the data rate on the serial port is 115,200 baud (n, 8, 1) . Any unknown character string received before a carriage return will cause the processor to issue the response ERROR - what? Twenty communications errors (non-ASCII characters or framing errors) will also cause the same response. 3.1 Command Mode
  • Command mode is the default mode for the device. It is used to:
  • Commands and responses are generally in simple ASCII text, unless stated otherwise. They are terminated by the ⁇ CR> character. Command characters are echoed by the device, and a response is required to all commands. Commands may be followed by parameter(s) (separated by spaces), also in ASCII. The standard acknowledge signal is OK. Any other invalid response should be considered as an error. When a valid response other than OK is returned, multiple items are separated by semicolons. All responses are terminated by ⁇ CR>. A list of commands and parameters (from the computer 114) and response (from the device 40) are shown in Fig. 9. In this case, a simple terminal emulation program known as TELIX is utilised both as a development aid and debug tool. This enables code development without the need for writing specialised software on the other end.
  • TELIX simple terminal emulation program
  • Command mode is entered either from power up or from an aborted data transmission (one or more CAN characters received during a transmission) .
  • aborted data transmission one or more CAN characters received during a transmission
  • 3.2 Data Transfer Mode Data transfer mode is entered by issuing the data command.
  • a predetermined protocol is used for the data transfer, which can be based on known protocols such as Xmodem. Note that commands are not accepted during ecg acquisition mode .
  • the leads to be transmitted in acquisition mode are first defined by the ecg command.
  • ECG Single Lead Data Structure There are two kinds of data.
  • the first is for sending data from single standard leads (ie. one of 1, 11, 111, aVR, aVL, AVF, VI, V2, V3 , V4, V5, V6) .
  • First byte bit7 bit ⁇ bits bit4 bit3 bit2 bitl bito 1 Dll D10 D9 D8 D7 D6 D5
  • Second byte bit7 bit ⁇ bit5 bit4 bit3 bit2 bitl bito 0 D4 D3 D2 Dl DO SI SO
  • Bit 7 is used as an aid to synchronise the data.
  • Dll... DO represent the 12 bits of the lead data SI and SO are special bits SI SO Meaning 0 0 normal data
  • Block2 (1 msec from commencement of block 1) byte 7 most significant 8 bits of lead V3 byte 8 least significant 4 bits of lead V3 , Most significant 4 bits of lead V4 byte 9 least significant 8 bits of lead V4 byte 10 least significant 8 bits of lead V4 byte 11 least significant 4 bits of lead V5, Most significant 4 bits of lead V6 byte 12 least significant 8 bits of lead V6 byte 13 linear 8 bit unsigned checksum of bytes 1..12 inclusive Again data is in unsigned, standard format. This entire structure is sent at 2msec intervals, to provide 500Hz sampling.
  • OxFEF OxFEF
  • Values of OxFFO and above are reserved. The following values have meaning at present .
  • OxFFl - lead is off
  • OxFF2 - pacing spike detected (pacing must be ON) .
  • Typical serial data speeds for serial links which would fall within the definition of "universal” as used in this specification typically can reach speeds (with present technology) of only up to about 115200 baud. This presents a problem where 500Hz sampling is used because this sample rate is not sufficient to pass the ECU 20msec triangle wave test (test no. 3.2.7.2 method D) . Sampling at 1000Hz will pass the test but, in the embodiment described above, this amount of data cannot be sent in real time at 115200 baud. That is, 8 channels of 1000Hz 12 bit data cannot be sent in real time at 115200 baud.
  • sampling is performed at 1000Hz with " peak picking" to be used as a compression algorithm to form 500Hz sampled data for transmission over the serial link.
  • the peak picking algorithm is shown diagrammatically in Fig. 10. The algorithm looks at two consecutive sample points and selects that sample point of the two which is the furthest as compared with the last selected data point for transmission.
  • the interface device 10, 40 of either of the first or second embodiment is connected to an ECG cable 12, 112 which, in turn, is connected by electrodes to a patient whose ECG is to be measured.
  • a serial cable 13, 113 is connected from the interface device 10, 40 to a personal computer 14, 114.
  • the personal computer includes a program (for example as described in the applicant's co-pending international application PCT/AU97/00821 referenced earlier) which is adapted to receive the digitised data stream from the interface cable device and store and/or display the data in a meaningful way for those skilled in the art to interpret the ECG data.
  • the present invention particularly applicable to facilitate the connection of patient ECG electrodes to a data processing device in a convenient manner whilst still adhering to all the necessary standards.

Landscapes

  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Molecular Biology (AREA)
  • Pathology (AREA)
  • Physics & Mathematics (AREA)
  • Biomedical Technology (AREA)
  • Veterinary Medicine (AREA)
  • Medical Informatics (AREA)
  • Biophysics (AREA)
  • Surgery (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Cardiology (AREA)
  • Power Engineering (AREA)
  • Measurement And Recording Of Electrical Phenomena And Electrical Characteristics Of The Living Body (AREA)

Abstract

L'invention porte sur un dispositif (10, 40) de câble d'interface d'électrocardiogramme universel comprenant i: un système (12, 112) de communication avec le patient au moyen de câbles destiné à être connecté et en communication électrique avec les câbles de l'électrocardiogramme du patient; ii: un système (23, 123) de traitement des signaux électriquement isolés destiné à prétraiter les signaux d'électrocardiogramme reçus par le système de communication avec le patient au moyen de câbles; iii: un système de communication informatique destiné à recevoir des signaux d'électrocardiogramme prétraités en provenance dudit système (23, 123) de traitement des signaux et destiné à émettre lesdits signaux d'électrocardiogramme vers un port de communication universel d'un ordinateur personnel ou d'un dispositif du même type. Font aussi l'objet de cette invention un câble formé à partir du dispositif de câble et un procédé de mise en mémoire tampon et de conversion des signaux analogiques de l'électrocardiogramme en signaux numériques en série.
PCT/AU1998/000014 1997-01-10 1998-01-12 Cable d'interface d'electrocardiogramme universel WO1998030145A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU54689/98A AU749181B2 (en) 1997-01-10 1998-01-12 Universal ECG interface cable

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AUPO4552 1997-01-10
AUPO4552A AUPO455297A0 (en) 1997-01-10 1997-01-10 Universal ecg interface cable

Publications (1)

Publication Number Publication Date
WO1998030145A1 true WO1998030145A1 (fr) 1998-07-16

Family

ID=3798857

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/AU1998/000014 WO1998030145A1 (fr) 1997-01-10 1998-01-12 Cable d'interface d'electrocardiogramme universel

Country Status (2)

Country Link
AU (1) AUPO455297A0 (fr)
WO (1) WO1998030145A1 (fr)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1159916A1 (fr) * 2000-05-29 2001-12-05 Siemens-Elema AB Unité d'interface pour un système de mesure électrophysiologique
EP1191877A1 (fr) * 1999-05-06 2002-04-03 Shell, Allan Michael Cable d'acquisition d'un signal physiologique
WO2009010189A1 (fr) * 2007-07-16 2009-01-22 Rheinisch-Westfälische Technische Hochschule Aachen Procédé de détection de biosignaux au moyen d'une unité de détection et dispositif associé
WO2010112815A1 (fr) 2009-03-30 2010-10-07 Danmedical Ltd Appareil médical
EP2405799A1 (fr) * 2009-03-13 2012-01-18 Polar Electro Oy Transfert de données
CN103860165A (zh) * 2014-02-28 2014-06-18 马骁 一种用于心电信号采集的导联标准接口及心电监护设备
WO2015153426A1 (fr) * 2014-04-02 2015-10-08 Draeger Medical Systems, Inc. Détection de la saturation dans un amplificateur à commande neutre pour électrocardiogramme
US10368805B2 (en) 2016-12-29 2019-08-06 Drägerwerk AG & Co. KGaA Electrode impedance measurement

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1989002247A1 (fr) * 1987-09-10 1989-03-23 Sanders William J Sonde cardiaque permettant d'utiliser un ordinateur individuel
US4924875A (en) * 1987-10-09 1990-05-15 Biometrak Corporation Cardiac biopotential analysis system and method
WO1991002484A1 (fr) * 1989-08-22 1991-03-07 Biometrak Corporation Systeme et methode d'analyse de biopotentiel cardiaque
EP0488410A1 (fr) * 1990-11-30 1992-06-03 Terumo Kabushiki Kaisha Système pour électrocardiographie
GB2272770A (en) * 1992-11-05 1994-05-25 Alan John Bishop Interface for electrocardiograph
DE4329946A1 (de) * 1993-09-04 1995-03-16 Csm Computer Systeme Mestechni Anordnung und Verfahren zum Erfassen und Verarbeiten von Biosignalen

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1989002247A1 (fr) * 1987-09-10 1989-03-23 Sanders William J Sonde cardiaque permettant d'utiliser un ordinateur individuel
US4924875A (en) * 1987-10-09 1990-05-15 Biometrak Corporation Cardiac biopotential analysis system and method
WO1991002484A1 (fr) * 1989-08-22 1991-03-07 Biometrak Corporation Systeme et methode d'analyse de biopotentiel cardiaque
EP0488410A1 (fr) * 1990-11-30 1992-06-03 Terumo Kabushiki Kaisha Système pour électrocardiographie
GB2272770A (en) * 1992-11-05 1994-05-25 Alan John Bishop Interface for electrocardiograph
DE4329946A1 (de) * 1993-09-04 1995-03-16 Csm Computer Systeme Mestechni Anordnung und Verfahren zum Erfassen und Verarbeiten von Biosignalen

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1191877A1 (fr) * 1999-05-06 2002-04-03 Shell, Allan Michael Cable d'acquisition d'un signal physiologique
EP1191877A4 (fr) * 1999-05-06 2003-05-02 Shell Allan Michael Cable d'acquisition d'un signal physiologique
JP2002058654A (ja) * 2000-05-29 2002-02-26 Siemens Elema Ab インタフェースユニットおよび電気生理測定システム
US6823208B2 (en) 2000-05-29 2004-11-23 Siemens Aktiengesellschaft Interface unit for an electrophysiology measurement system
EP1159916A1 (fr) * 2000-05-29 2001-12-05 Siemens-Elema AB Unité d'interface pour un système de mesure électrophysiologique
WO2009010189A1 (fr) * 2007-07-16 2009-01-22 Rheinisch-Westfälische Technische Hochschule Aachen Procédé de détection de biosignaux au moyen d'une unité de détection et dispositif associé
US9066664B2 (en) 2009-03-13 2015-06-30 Polar Electro Oy Data transfer
EP2405799A1 (fr) * 2009-03-13 2012-01-18 Polar Electro Oy Transfert de données
EP2405799A4 (fr) * 2009-03-13 2014-01-08 Polar Electro Oy Transfert de données
WO2010112815A1 (fr) 2009-03-30 2010-10-07 Danmedical Ltd Appareil médical
US10146912B2 (en) 2009-03-30 2018-12-04 DanMedical Ltd. Medical apparatus
CN103860165A (zh) * 2014-02-28 2014-06-18 马骁 一种用于心电信号采集的导联标准接口及心电监护设备
WO2015153426A1 (fr) * 2014-04-02 2015-10-08 Draeger Medical Systems, Inc. Détection de la saturation dans un amplificateur à commande neutre pour électrocardiogramme
US10368805B2 (en) 2016-12-29 2019-08-06 Drägerwerk AG & Co. KGaA Electrode impedance measurement

Also Published As

Publication number Publication date
AUPO455297A0 (en) 1997-01-30

Similar Documents

Publication Publication Date Title
US4858617A (en) Cardiac probe enabling use of personal computer for monitoring heart activity or the like
US3910257A (en) Medical subject monitoring systems
US5704351A (en) Multiple channel biomedical digital telemetry transmitter
EP1210006B1 (fr) Systeme et procede de generation et de transfert de donnees
EP2775909B1 (fr) Dispositif de mesure de signaux électromyographiques caractérisé par une haute résolution et un grand nombre de canaux
EP0712603A2 (fr) Circuit d'interface auto-alimenté pour un capteur de transducteur
WO2002005700A3 (fr) Procede et systeme d'electrocardiographe sans fil
US7260428B2 (en) Shield arrangement for ECG lead wires
CN101282682A (zh) 用于压力监视的无线通信系统
EP0407534A1 (fr) Procede de biotelemetrie pour la transmission de potentiels bioelectriques differentiels et dispositif de transmission de signaux d'ecg.
WO1998030145A1 (fr) Cable d'interface d'electrocardiogramme universel
EP1467651A2 (fr) Systeme d'electrocardiogramme sans fil
EP0617917A1 (fr) Récepteur pour des signaux différentiels
JPH11513592A (ja) 誘導電極の接続システム
GB2442330A (en) Floating, expandable ECG and/or EEG data acquisition system
EP1112024A1 (fr) Systeme de surveillance d'electrocardiographie
US6421558B1 (en) Uterine activity monitor and method of the same
US20030171689A1 (en) System for detecting brain activity
US5233999A (en) Electromyograph with data transmission comprising no metallic conductors
Markandey ECG Implementation on the TMS320C5515 DSP Medical Development Kit (MDK)
EP0778002B1 (fr) Système destiné à la surveillance cardiaque présentant une gamme réduite d'acquisition de signaux
AU749181B2 (en) Universal ECG interface cable
US20020161309A1 (en) Fiber optic power source for an electroencephalograph acquisition apparatus
EP0537936A1 (fr) Transmission facsimilée pour les données électrocardiographiques
CN201164462Y (zh) 便携式心电信号测量装置

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): AL AM AT AU AZ BA BB BG BR BY CA CH CN CU CZ DE DK EE ES FI GB GE GH GM GW HU ID IL IS JP KE KG KP KR KZ LC LK LR LS LT LU LV MD MG MK MN MW MX NO NZ PL PT RO RU SD SE SG SI SK SL TJ TM TR TT UA UG US UZ VN YU ZW AM AZ BY KG KZ MD RU TJ TM

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): GH GM KE LS MW SD SZ UG ZW AT BE CH DE DK ES FI FR GB GR IE

DFPE Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101)
121 Ep: the epo has been informed by wipo that ep was designated in this application
WWE Wipo information: entry into national phase

Ref document number: 54689/98

Country of ref document: AU

REG Reference to national code

Ref country code: DE

Ref legal event code: 8642

NENP Non-entry into the national phase

Ref country code: JP

Ref document number: 1998530420

Format of ref document f/p: F

122 Ep: pct application non-entry in european phase
WWE Wipo information: entry into national phase

Ref document number: 09341536

Country of ref document: US

WWG Wipo information: grant in national office

Ref document number: 54689/98

Country of ref document: AU