WO1998049937A1 - Electrode catheter for endocardial mapping - Google Patents
Electrode catheter for endocardial mapping Download PDFInfo
- Publication number
- WO1998049937A1 WO1998049937A1 PCT/SE1998/000741 SE9800741W WO9849937A1 WO 1998049937 A1 WO1998049937 A1 WO 1998049937A1 SE 9800741 W SE9800741 W SE 9800741W WO 9849937 A1 WO9849937 A1 WO 9849937A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- electrode
- catheter
- det2
- detl
- catheter according
- Prior art date
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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
- A61B5/25—Bioelectric electrodes therefor
- A61B5/279—Bioelectric electrodes therefor specially adapted for particular uses
- A61B5/28—Bioelectric electrodes therefor specially adapted for particular uses for electrocardiography [ECG]
- A61B5/283—Invasive
- A61B5/287—Holders for multiple electrodes, e.g. electrode catheters for electrophysiological study [EPS]
Definitions
- the present invention relates to an electrode catheter for endocardiac mapping, comprising at least one electrode, intended for insertion into the heart for endocardiac sensing of electrical activity, on the catheter's distal end.
- Visualization i.e. mapping
- electrical activity in the heart is normally performed by placing one or a plurality of electrodes against the heart wall via an intravenous catheter.
- the electrical signal picked up by the electrode when myocardium adjacent to the electrode is activated is recorded along with the time of this activation, and the recording is compared to a recording from a reference electrode located e.g. near the sinoatrial node.
- mapping catheter equipped with a large number of electrodes.
- all the signals from the electrodes on the catheter tip are carried by conductors inside the catheter to signal processing equipment outside the patient. This limits the possible number of electrodes which can be used, since a catheter only has room for a limited number of conductors.
- Another disadvantage of the prior art technique is that the signal processing equipment which is to receive and process a relatively large number of parallel signals, sampled at a fast rate, must be advanced and relatively expensive. The signal processing equipment must also be capable of post-processing the signals so sequences of interest can be extracted.
- the objective of the present invention is to come to terms with the aforementioned shortcomings of the previously known mapping technique and make possible the use of a large number of electrodes, on one and the same catheter, for mapping purposes .
- an electrical detection unit is accordingly arranged on the distal end of the catheter to extract relevant information on the time at which muscle tissue is activated at a plurality of points, and this time information is sent to information processing equipment outside the catheter.
- Information on the time of activation at different electrodes is sufficient for mapping the activity wave's propagation. Since only current time recordings are sent through the catheter in this fashion, information content is limited, thereby facilitating information transmission from a large number of electrodes. With an electrode catheter according to the invention there is accordingly a reduction in the amount of data transmitted to external information processing equipment.
- circuit means are arranged for serial transmission of times stored in a RAM to the information processing equipment. Since only these time registrations are serially transmitted to the signal processing equipment, the amount of information transmitted is relatively small, thereby reducing demands on transmission bandwidth and making possible the use of simple circuit means .
- means are arranged for serial selection of any optional electrode for heart stimulation and/or on-line recording of electrical activity sensed by the electrode. In such recording and/or stimulation, a separate conductor, running through the catheter out of the patient, is appropriately used, and switching to a specific electrode is performed by a chip in an integrated circuit on the catheter tip. The electrode to which this separate conductor is to be connected is therefore selected with this circuit. So different electrodes can be selected for recording and/or stimulation solely with switching operations in the circuit on the chip, with no need to reposition electrodes manually.
- FIG. 1 shows one example of the integrated circuit on the chip on the tip of the catheter
- FIG. 2 shows the chronological progression of a voltage, sensed by an electrode catheter, inside the heart.
- FIG. 1 shows a diagram of an electrical detection circuit, integrated into a chip on the distal end of an electrode catheter.
- the electrode catheter (not shown) suitably has a plurality of electrodes that can be connected in an optional fashion to the detection circuit, "detl" and “det2" in FIG. 1 designate two such electrodes, each connected to a filter 2 in the detection circuit, on the catheter.
- These filters 2 filter out background signals and noise.
- Parameters such as the threshold frequency and, in integration filtration, the time at which filtration is performed, can be set for the filters.
- An algorithm can also be run at every sampling to set certain filter constants.
- the output signals from the filters 2 and a preset reference voltage V re f are fed to inputs on the comparators 4.
- Each comparator 4 sends an output signal to one of the inputs on its AND gate 6 if output signals from the filters 2 exceed the reference voltage V re f . Output signals from the filters 2 are sent straight to the AND gates ' 6 other input .
- the AND gates 6 send output signals to an address decoder 8 when a signal appears on both gate 6 inputs.
- the address decoder 8 senses the electrode detl, det2 from which a signal originates, and the signal information, along with an associated address, is stored in a RAM 10.
- the addresses of the electrodes detl, det2 can simply consist of consecutive electrode numbering, i.e. the electrode which goes high is assigned a number in the address decoder 8.
- a 16-bit clock 12 with an associated oscillator 14 are also connected to the RAM 10 to clock the time in RAM 10 at which a signal passes the address bus, the bus then being zeroed.
- the filters 2 can perform a derivation of the input signal, depending on the conditions set for the signal sampling. Setting both a derivation condition and an absolute value condition for sampling a time value rs often appropriate. Performing time detection on a flank of the sensed voltage signal is often advantageous, cf. FIG. 2. The flank must then be well-defined, i.e. relate to a "genuine signal" and not to noise. This can often be achieved in a reliable fashion by derivation of the sensed signal and utilization of a derivation condition.
- a derivation condition can also be combined with an absolute value condition for time detection, i.e. it is possible to combine comparisons of the derivative's value and the signal's absolute value with their associated reference values in order to achieve more reliable detection of the times .
- the times stored in the RAM 10 can be serially retrieved with a serial circuit 16 and sent to information processing equipment, such as a computer, outside the patient. Since only current time registrations are sent to the computer outside the patient, the amount of information transmitted is relatively small, so simple circuits with a narrow bandwidth can be used for the information transfer.
- the present invention therefore achieves a reduction in data in a simple way. So only information on the time activation occurs at a specific electrode needs to be sent to the external computer during the mapping of an activation wave's propagation.
- the catheter can contain one or a plurality of separate conductors 18 for on-line recording of electrical activity or for stimulating a patient's heart across one of the electrodes. In certain situations, it may be desirable for a physician to be able to continuously monitor electrical activity in a patient's heart on a PC screen.
- This/these conductor (s) 18 is/are connected to the relevant electrode (s) via the chip in the integrated circuit on the catheter tip.
- the electrode (s) to which the separate conductor (s) 18 is/are to be connected for on-line registration or stimulation can accordingly be selected via the serial circuit 16. Connecting the separate conductors 18 to other electrodes on the electrode catheter is also possible by means of simple re- switching of the detection circuit.
- the electrode catheter will only contain a small number of conductors for serial connection to the integrated detection circuit on the chip. They will also serve as separate conductors for direct connection to electrodes while still making possible the use of a large number of electrodes on the catheter for mapping as well as use on-line registration and stimulation.
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- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Biomedical Technology (AREA)
- Heart & Thoracic Surgery (AREA)
- Cardiology (AREA)
- Biophysics (AREA)
- Pathology (AREA)
- Engineering & Computer Science (AREA)
- Physiology (AREA)
- Physics & Mathematics (AREA)
- Medical Informatics (AREA)
- Molecular Biology (AREA)
- Surgery (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Measurement And Recording Of Electrical Phenomena And Electrical Characteristics Of The Living Body (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19882357T DE19882357T1 (en) | 1997-05-07 | 1998-04-23 | Electrode catheter for intracardiac mapping |
JP54750398A JP2001527443A (en) | 1997-05-07 | 1998-04-23 | Electrode catheter for intracardiac mapping |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE9701713A SE9701713D0 (en) | 1997-05-07 | 1997-05-07 | Electrode catheter for endocardial mapping |
SE9701713-1 | 1997-05-07 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1998049937A1 true WO1998049937A1 (en) | 1998-11-12 |
Family
ID=20406860
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/SE1998/000741 WO1998049937A1 (en) | 1997-05-07 | 1998-04-23 | Electrode catheter for endocardial mapping |
Country Status (4)
Country | Link |
---|---|
JP (1) | JP2001527443A (en) |
DE (1) | DE19882357T1 (en) |
SE (1) | SE9701713D0 (en) |
WO (1) | WO1998049937A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPWO2014141682A1 (en) * | 2013-03-13 | 2017-02-16 | 日本電気株式会社 | Sensor terminal and signal acquisition method |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4446868A (en) * | 1982-05-24 | 1984-05-08 | Aronson Alfred L | Cardiac arrhythmia analysis system |
US4877032A (en) * | 1986-06-16 | 1989-10-31 | Siemens Aktiengesellschaft | Sensor arrangement for the control of implantable devices |
GB2227842A (en) * | 1988-11-22 | 1990-08-08 | Alan John Camm | ECG signal monitoring |
-
1997
- 1997-05-07 SE SE9701713A patent/SE9701713D0/en unknown
-
1998
- 1998-04-23 WO PCT/SE1998/000741 patent/WO1998049937A1/en active Application Filing
- 1998-04-23 DE DE19882357T patent/DE19882357T1/en not_active Withdrawn
- 1998-04-23 JP JP54750398A patent/JP2001527443A/en active Pending
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4446868A (en) * | 1982-05-24 | 1984-05-08 | Aronson Alfred L | Cardiac arrhythmia analysis system |
US4877032A (en) * | 1986-06-16 | 1989-10-31 | Siemens Aktiengesellschaft | Sensor arrangement for the control of implantable devices |
GB2227842A (en) * | 1988-11-22 | 1990-08-08 | Alan John Camm | ECG signal monitoring |
Also Published As
Publication number | Publication date |
---|---|
SE9701713D0 (en) | 1997-05-07 |
JP2001527443A (en) | 2001-12-25 |
DE19882357T1 (en) | 2000-04-13 |
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