EP0077802A1 - Herzschrittmacher - Google Patents
HerzschrittmacherInfo
- Publication number
- EP0077802A1 EP0077802A1 EP82901408A EP82901408A EP0077802A1 EP 0077802 A1 EP0077802 A1 EP 0077802A1 EP 82901408 A EP82901408 A EP 82901408A EP 82901408 A EP82901408 A EP 82901408A EP 0077802 A1 EP0077802 A1 EP 0077802A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pulse
- stimulation
- signal
- pulse shaper
- output
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 230000000638 stimulation Effects 0.000 claims abstract description 77
- 238000004904 shortening Methods 0.000 claims abstract description 4
- 230000000747 cardiac effect Effects 0.000 claims description 8
- 230000004044 response Effects 0.000 claims description 8
- 230000008859 change Effects 0.000 claims description 7
- 238000011156 evaluation Methods 0.000 claims description 7
- 239000003990 capacitor Substances 0.000 claims description 6
- 238000011144 upstream manufacturing Methods 0.000 claims description 5
- 230000009471 action Effects 0.000 claims description 4
- 238000007599 discharging Methods 0.000 claims description 2
- 230000007704 transition Effects 0.000 claims description 2
- 230000008878 coupling Effects 0.000 claims 1
- 238000010168 coupling process Methods 0.000 claims 1
- 238000005859 coupling reaction Methods 0.000 claims 1
- 230000003068 static effect Effects 0.000 claims 1
- 238000007493 shaping process Methods 0.000 abstract description 9
- 230000006399 behavior Effects 0.000 description 12
- 230000005540 biological transmission Effects 0.000 description 9
- 230000009467 reduction Effects 0.000 description 8
- 230000006870 function Effects 0.000 description 6
- 238000001514 detection method Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 238000005259 measurement Methods 0.000 description 5
- 230000008054 signal transmission Effects 0.000 description 4
- 235000014676 Phragmites communis Nutrition 0.000 description 3
- 230000006978 adaptation Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 230000010287 polarization Effects 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 241001611093 Stimula Species 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 230000003044 adaptive effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000001208 nuclear magnetic resonance pulse sequence Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 230000004936 stimulating effect Effects 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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
- A61B5/30—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
- A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
- A61N1/00—Electrotherapy; Circuits therefor
- A61N1/18—Applying electric currents by contact electrodes
- A61N1/32—Applying electric currents by contact electrodes alternating or intermittent currents
- A61N1/36—Applying electric currents by contact electrodes alternating or intermittent currents for stimulation
- A61N1/362—Heart stimulators
- A61N1/365—Heart stimulators controlled by a physiological parameter, e.g. heart potential
-
- 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
Definitions
- the invention relates to a pacemaker in accordance with the preamble of patent claim 1.
- the stimulation pulse is not permeable for some time to signals picked up by the heart, so that, for example, separate electrodes with a separate input circuit are required to check the success of the stimulation.
- the invention has for its object to reduce the disturbing overdrive of the input amplifier after sending out a stimulation pulse so that the signals that are important for the control of the pacemaker can be picked up without any problems.
- the input amplifier had to be caused to settle as shortly as possible after the stimulation pulse had been emitted, so that intracardiac signals can be further amplified and evaluated.
- the input signals to be expected have such an amplitude spectrum that further processing would best be carried out with a DC voltage amplifier.
- a lower cut-off frequency of 15 Hz is regarded as a good compromise for the combination of input amplifier and the preceding pulse.
- This combination is preferably an active high-pass filter with a 3dB cut-off frequency of 15 Hz and a gain in
- the settling time should be set such that the activation with a stimulation pulse extended to several hundred milliseconds no longer causes the settling amplitude after approx. 30 seconds to trigger the trigger circuit provided for evaluating intracardial signals in the corresponding detection device.
- the optimal setting of the filter parameters depends on the signal transmission conditions in the heart of the Patients, ie on the electrode fixation and the type of electrodes used.
- an additional device is provided according to a preferred development of the invention, which adjusts the filter adjustment to the changing conditions.
- the adjustment criterion is the period of time that elapses before the signal at the output of the EKG amplifier has decayed after an artificial stimulation pulse. In this way it is achieved that the decay behavior of the input amplifier is optimally short when artificial stimulation pulses appear, so that signals from the heart can be picked up and evaluated again after a very short time.
- means are provided in order to use the signal obtained with the pulse generator shown to monitor the success of the pacemaker, that is to say to influence the behavior by signals which were recorded immediately after the delivery of a stimulation pulse.
- This arrangement can be used particularly advantageously in connection with an automatic amplitude control of the output pulses of the pacemaker, the period of time after which intra-cardiac signals recorded following a stimulation pulse can be processed again.
- the invention can thus also be used in particular with pacemakers which have a Carry out double-chamber stimulation, since here too a complete separation of the signals to be recorded is required.
- the time between the stimulation pulse and the usable intracardiac signal becomes additional shortened by the provision of a circuit for discharging the output capacitor of the stimulation circuit, as is known per se.
- FIG. 1 shows a circuit diagram of an exemplary embodiment of the pacemaker according to the invention in a block diagram
- FIG. 2 shows the principle according to which such a filter is preferably constructed
- FIG. 3 shows, as an exemplary embodiment, a circuit diagram for the pulse shaper constructed according to the principle of FIG. 2, which is designated by 10 in FIG. 1, and
- Figure 4 shows an embodiment of an additional module for automatic adaptation of the filter properties to changing signal transmission conditions in the heart with means for varying the stimulation energy depending on the success.
- the signal-inhibited demand pacemaker shown as a block diagram in FIG. 1 initially contains the essential components of conventional known pacemakers, such as an astable multivibrator which forms a timer 1 and which triggers the output stage 2 and therefore retrieves a stimulation pulse and a detection unit 3 which when registering an R wave, reset timer 1
- O PI sets, so that the action cycle (850 msec) is initiated anew.
- the stimulation pulses emitted by output stage 2 reach the heart via a pacemaker electrode (connection 4).
- this Shamacherelek ⁇ trode the intracardiac electrogram recorded and an input amplifier (ECG amplifier) 5 Detek ⁇ tion unit 3 supplied for resetting (De and-functional) "of the timer respectively at the beginning of the Stimula ⁇ tion cycle, wherein the reset is carried out via the reed switch M located in the switch position shown.
- An upstream refractory time unit 6, for example likewise in the form of an astable multivibrator, prevents the reset of the timer 1 within the first 400 msec after stimulation and detection, for example 3 downstream interference filter 7 identifies electrical and magnetic alternating fields and switches (via the other switch position of the reed switch M) the timer 1 to a fixed-frequency mode of operation before there can be interference with the detection unit 3 and pulse suppression of the reed scha
- the detector bypasses lters M with the help of a magnet, resulting in a firm stimulation.
- an energy source provides the power supply for the device shown in FIG. 1.
- the stimulation pulses required for stimulating the heart have a voltage amplitude of approximately 5 V with a
- the electrical signals caused by the functioning of the heart (intracardiac signals), which are taken from the pacemaker electrode 4 and then serve to control the pacemaker, on the other hand only have amplitudes in the millivolt range, so that they are amplified by the input gain 5 before further processing need to be raised.
- the output stage of the timer 1 serving as a pulse generator is directly connected to the input of the input amplifier 5 in known cardiac pacemakers, the input amplifier is heavily overdriven during the transmission of a stimulation pulse.
- the electrolyte surrounding the pacemaker electrode 4 causes the effects of a stirulation pulse to subside after several hundred milliseconds due to the polarization voltage that is developing.
- the output voltage U a at Output 12 of the pulse shaper 10 according to FIG. 2 reaches the detection device 3 in FIG. 1.
- the pulse shaper 10 according to FIG. 2 contains all-passes AP] _ and AP2, which are connected in series with one another and each cause a phase rotation by 90 ° at a frequency of 15 Hz, so that the voltage O- versus U e by 90 ° and the voltage U2 is rotated 180 ° in phase with respect to U e .
- Such an all-pass has a transmission function
- the input voltage U e and the output voltages of the all-passes are weighted in evaluation elements B 0 , Bj, B 2 with passive coefficients K Q , KJ_, K 2 , and added to the input voltage U a in an adder A according to the sign.
- the coefficients are selected, for example, as follows:
- the filter chosen as a pulse shaper according to FIG. 2 has the advantage of low component expenditure with a large variation range of the possible filter setting.
- This filter is also predestined for an adaptive setting of the filter coefficients. If the coefficients are chosen so that K 0 has the opposite polarity to K] _, the filter has high-pass characteristics.
- a corresponding digital filter can also be used, which, although it requires more effort, is easier to integrate.
- the detailed embodiment shown in FIG. 3 has approximately one gain in the pass band and serves to "shorten" the stimulation pulse, while the actual increase in the amplitude value takes place in the input amplifier 5 to be connected (in FIG. 1). Since can be inserted between the output 12 in FIG. 3 and the input amplifier 5 in FIG. 1, a limiter circuit which keeps voltage peaks with a voltage greater than 1.2 V away from the input amplifier 5, so that extreme overloads are avoided .
- the exemplary embodiment shown in FIG. 3 has a pulse shaping part between the input terminal 11 and the output 12 and an upstream bandpass consisting of resistors R1 and R2 and capacitors C1, C2 with a downstream isolating amplifier 13.
- the bandpass has an upper 3dB Limit frequency of approximately 40 Hz and a lower 3dB limit frequency of approximately 15 Hz.
- resistors R3 to R 5 are formed by resistors R3 to R 5 and a capacitor C3 in conjunction with an operational amplifier 14.
- a second all-pass connected downstream is formed by resistors R6 to R8 and one Capacitor C4 in connection with an operational amplifier 15.
- the voltages U e , U_, U 2 are also fed via evaluation elements to a summing circuit which contains, inter alia, an operational amplifier 16 and a resistor R9 as a negative feedback path.
- the first evaluation element (corresponding to the coefficient K 0 ) consists of a voltage divider R11-R12, which is also part of the summing circuit containing the operational amplifier 16 and is connected to the non-inverting input of the operational amplifier 16.
- the second and third evaluation elements (corresponding to K x and ⁇ 2) are formed by voltage dividers P1-R13-R14 or P2-R15-R12. The first evaluation element is connected to the inverting and the second to the non-inverting input of the operational amplifier 16.
- the resistors (R) have resistance values of 100 kilohms and the capacitors (C) have capacitance values of 0.1 microfarads, unless other values are given in FIG. 3.
- the setting of the coefficients is carried out in such a way that the above-mentioned conditions for operation with conventional electrodes can be met, the above-mentioned values on the one hand representing a favorable mean value, but on the other hand an adaptation to special electrodes can take place accordingly.
- an FET switch is inserted, which is controlled by the output signal of the output stage 2 such that the signal path into the main amplifier is blocked during the settling time of the pulse shaper 10 - for example for one
- C -__ 1 Time up to and including 30 msec. From the transmission of the stimulation pulse from the output stage 2. Such an FET switch is shown in FIG. 3 as the output of the pulse shaper. It shorts the output signal of the filter via a resistor R 16 with a high resistance. The FET switch is controlled from the output of output stage 2. The corresponding connecting line is shown in FIG. 1. After this "blanking time" has ended, the amplifier is switched on again.
- the amplifier can also perform the task of eliminating the effects of the polarization voltage on the pacemaker electrode. It is then designed to act like a first-order high-pass filter. However, this causes a phase distortion that results in a large increase in group delay.
- the pulse shaper 10 upstream of the main amplifier must compensate for this group delay at the lower frequency limit by a negative group delay.
- the generation of such a negative group delay is - like the measurement of the filters used - known per se from the dissertations J. Rotter "Adjustable Group Delay Filters, Realization and Approximation", 1978, University of Kaiserslautern, and W. Rupprecht: “Linear networks with negative group term", 1961, University of Düsseldorf.
- the output stage reproduced in block circuit form in FIG. 1 is provided with a circuit for shortening the Recovery time equipped after a stimulation pulse, as shown in the European patent application EP-Al-0 000 989.
- a circuit for shortening the Recovery time equipped after a stimulation pulse as shown in the European patent application EP-Al-0 000 989.
- the minimum time between stimulation and intracardial signal recording is additionally shortened considerably.
- FIG. 4 shows an exemplary embodiment of an arrangement which is suitable for changing individual parameters of the pulse shaper stage as a function of the decay time. Furthermore, additional means are provided which change the output amplitude of the pacemaker in response to cardiac actions which have been stimulated by a previous pulse of the pacemaker. Depending on the success of the stimulation, the output amplitude of the stimulation pulses is increased or decreased. A step-up takes place if no stimulation success has been achieved, while if the stimulation was successful, the amplitude is reduced at intervals by a fixed amount. The reduction is initially carried out periodically on a trial basis after a certain number of stimulation pulses. If there is no successful stimulation after a reduction in the stimulation amplitude, the stimulation is carried out again in the immediately following stimulation in order to ensure the necessary stimulation security for the patient.
- the means for changing the output amplitude as a function of success - as shown in FIG. 4 - are independent of the means for varying the pulse shaping parameters.
- the representation of the two functions was in Embodiment realized on the basis of a single assembly, different components being able to be used with regard to both functions, so that simplifications resulted.
- the output signal of stage 2 in FIG. 1 is fed to a frequency divider stage 17 which, by generating a control pulse sequence which is lower than the stimulation frequency, ensures that, depending on the stimulation pulses emitted, the adaptation of the pulse former stage or the reduction in the stimulation amplitude is reduced not repeated with every pulse, but only at regular intervals. In the absence of stimulation pulses in demand mode, no adjustment is necessary.
- a counter 18, which is driven by a clock generator (not shown) with higher-frequency timing pulses, is reset to an initial state by a first output signal of the frequency divider 17 and activated for counting. In the present example, this counting process is initiated every sixth pulse emitted by the pacemaker.
- the output signal of the amplifier 5 downstream of the pulse shaper 10 reaches a Schmitt trigger or a similar component which gives a signal as long as an output signal is emitted at the output of the amplifier 5, the amount of which differs sufficiently from zero or for as long an input signal has not decayed to a negligible "value.
- the output signal of the trigger stage 19 arrives at a pulse shaper 20, which the trailing edge during the
- the further outputs x and y are further frequency-divided compared to the signal fed to the counter 18 and therefore change in even slower cycles.
- the outputs x and y may additionally be divided by a factor of 16 (output x) and 32 (output y) compared to the aforementioned output, so that four are connected by means of AND gates 21 to 24 by correspondingly linking the signals at their outputs further signals are available which appear alternately in succession in a time cycle for a quarter of the total period.
- the signal present at the AND gate 21 defines a first measurement cycle, during which it is determined whether a count value stored in a memory 25 still corresponds to the time that the input circuit needs to reach the idle state after an artificial stimulation pulse.
- the counter 25 is increased to its maximum value by means of a corresponding input signal by means of a further pulse shaper 26, which emits a signal on the rising edge of the output signal of the AND gate 21.
- the output signal of the counter 18 is constantly compared by means of a comparator 27 with the content of the counter 25 .
- the comparator 27 outputs an output signal as long as the counter reading of the counter 18 is less than the numerical value contained in the memory 25.
- this signal is not output when the pulse shaper 20 a pulse as a sign of completion of the delivery of an output signal • om amplifier 5 appears, it is by means of an AND gate 25 to which the output signal of the comparator 27 and also the signal of the AND gate 21 is supplied, a transfer stage 29 is activated, which overwrites the content of the counter 18 into the memory 25 at this time.
- the memory 25 thus contains the numerical value which corresponds to the current decay time of the arrangement and characterizes the signal transmission behavior in the heart and pulse shaping stage. While the output signal of the AND gate 21 appears, this process is repeated with each stimulation pulse.
- the shortest decay time is determined in the case of several stimulation pulses, and if artefacts or interference signals occur, a longer signal duration will appear after a stimulation pulse, which will have no effect on the reduction of the count value in memory 25. Deleting the memory in the meantime ensures that the transmission behavior also follows such changes in the transmission behavior in the heart - for example with changes in the electrode effect - which result in an extension of the decay behavior. Subsequent to this measurement period, characterized by an output signal from the AND gate 22, there is a period with which an attempt is made to improve the signal decay behavior by changing a parameter of the pulse shaper stage 10 (in FIG. 1).
- the variant of the adjusting element P1 of the pulse shaper 10 shown in FIG. 3 must first be explained.
- a decade of resistance u is used here, in which switches are connected in parallel to the individual resistors and are controlled by a counting and decoding arrangement 28.
- the counting and decoding apparatus 28 includes a so-counting it, which are incremented in single counts or decremented (inputs "+1" or ⁇ -l "in the figure).
- the indices" can p "and” t "are intended to indicate that the incrementing or incrementing takes place permanently or temporarily via the inputs concerned.
- the total resistance value of the potentiometer P1 ' is thus dimensioned such that it increases or decreases in accordance with the increase or decrease in the counter reading.
- a signal reaches the transmission element 29, which changes the memory 25 according to the last status of the counter 18.
- Di The intermediate AND gate is activated via an OR gate 30.
- the output signal of the comparator also reaches AND gates 31 and 32, which control the inputs "+ lt" and "-p" when the AND gates 22 or 23 a signal is present.
- the counter 28 would be reduced by one value via the AND gate 32 - as a sign of this. that an improved decay behavior of the pulse shaper 19 could be achieved with the assigned setting of the potentiometer Pl 1 .
- a change in the transmission conditions in the sense that an extended decay time has to be taken into account is taken into account in that in an initial period (characterized by switching through the AND gate 21 a readjustment from the point of view that an optimization only takes place in a range of decay times can be carried out which are longer than the previously found values.
- a fourth measuring period (characterized by switching the AND gate 24) is periodically available in order to control the effectiveness of the stimulation pulses. By shortening the decay of the input stage 5, it is namely 'now possible to determine the success of the artificial stimulation pulses from the following signal response of the heart directly.
- a monoflop 34 is set with an artificial stimulation pulse, the pulse duration of which corresponds to the time during which a response signal appearing in response to a stimulation pulse is to be expected from the heart.
- the output signal of the monoflop 34 reaches an AND gate 35, at the other input of which the output signal of the pulse shaping stage 20 is present. If, therefore, a pulse appears after a stimulation pulse, which indicates the decay of the signal picked up by the heart, this pulse passes via the AND gate 35 to a flip-flop 36, which is then set.
- the trailing edge of the pulse emitted by the monoflop 34 is converted into a short-lasting pulse by means of a pulse shaper 39, which indicates the end of the measuring period for the signal recording from the heart to be carried out here and is delayed by a delay element 40 by a few milliseconds.
- this pulse reaches the decrementing input (-) of a control circuit 42 via an AND gate 41, the outputs of which are connected to a control circuit 43 for the output amplitude of the stimulation pulses.
- the control circuit 43 may be either as shown from a connected resistor chain - but made in accordance with the potentiometer Pl 1 -or- ⁇ from a controllable voltage multiplier in stages. '.
- Decrementing reduces the amplitude of the stimulation pulses when the stimulation is successful, whereas it increases when there is no cardiac response to a stimulation. This occurs when the flip-flop 38 is not set in response to an output signal of the pulse shaping stage 39, the output signal of which in this case reaches the incrementing input of the counter 42 via an AND gate 44, because the AND gate 44 thus has its inverting input connected to the is connected to the Q output of the flip-flop 38.
- the amplitude of the stimulation pulses can be continuously increased by incrementing the counter 42 (the permissible input values being adjustable by selecting the type of pacemaker or by external programming means), in order to stimulate the electrode contact as quickly as possible ⁇
- the reduction in the amplitudes depends on the output signal of the AND gate 24, which during a fourth measurement period, for the two outputs x and y of the
Landscapes
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Heart & Thoracic Surgery (AREA)
- General Health & Medical Sciences (AREA)
- Biophysics (AREA)
- Cardiology (AREA)
- Engineering & Computer Science (AREA)
- Biomedical Technology (AREA)
- Veterinary Medicine (AREA)
- Public Health (AREA)
- Animal Behavior & Ethology (AREA)
- Pathology (AREA)
- Physics & Mathematics (AREA)
- Medical Informatics (AREA)
- Molecular Biology (AREA)
- Surgery (AREA)
- Radiology & Medical Imaging (AREA)
- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
- Physiology (AREA)
- Electrotherapy Devices (AREA)
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE3118095 | 1981-05-04 | ||
DE3118095 | 1981-05-04 |
Publications (1)
Publication Number | Publication Date |
---|---|
EP0077802A1 true EP0077802A1 (de) | 1983-05-04 |
Family
ID=6131696
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP82901408A Withdrawn EP0077802A1 (de) | 1981-05-04 | 1982-05-04 | Herzschrittmacher |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP0077802A1 (de) |
WO (1) | WO1982003787A1 (de) |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2362063C3 (de) * | 1973-12-13 | 1979-11-29 | Siemens Ag, 1000 Berlin Und 8000 Muenchen | Schaltungsanordnung zum Erfassen von physiologischen elektrischen Meßsignalen |
US4041953A (en) * | 1974-04-12 | 1977-08-16 | Cardiac Pacemakers, Inc. | Cardiac pacer circuit |
US3949758A (en) * | 1974-08-01 | 1976-04-13 | Medtronic, Inc. | Automatic threshold following cardiac pacer |
DE2519606A1 (de) * | 1975-05-02 | 1976-11-11 | Siemens Ag | Herzschrittmacher |
US4055189A (en) * | 1975-05-19 | 1977-10-25 | Medalert Corporation | Condition monitoring pacer |
US4114627A (en) * | 1976-12-14 | 1978-09-19 | American Hospital Supply Corporation | Cardiac pacer system and method with capture verification signal |
DE2701104A1 (de) * | 1977-01-12 | 1978-07-13 | Medtronic France S A | Herzschrittmacher |
EP0000989B1 (de) * | 1977-08-19 | 1981-11-25 | BIOTRONIK Mess- und Therapiegeräte GmbH & Co Ingenieurbüro Berlin | Bedarfschrittmacher mit einer verminderten Erholungszeit |
-
1982
- 1982-05-04 EP EP82901408A patent/EP0077802A1/de not_active Withdrawn
- 1982-05-04 WO PCT/DE1982/000106 patent/WO1982003787A1/en not_active Application Discontinuation
Non-Patent Citations (1)
Title |
---|
See references of WO8203787A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO1982003787A1 (en) | 1982-11-11 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
DE2823804C2 (de) | Programmierbarer, einpflanzbarer Herzschrittmacher | |
EP0012709B1 (de) | Schaltungsanordnung für ein elektrokardiographisches Signal | |
EP0104452B1 (de) | Synchronisierbarer Herzschrittmacher mit Störerkennungsschaltung | |
DE69830385T2 (de) | Vorrichtung zur Unterdrückung von Datenabweichungen, hervorgerufen durch äussere Störungen in in gemessenen Signalen in einem implantierbaren Herzschrittmacher | |
DE2006076A1 (de) | Herzschrittmacher | |
DE1296283C2 (de) | Anordnung zur erzielung einer regelmaessigen herzschlagfolge | |
DE2741176A1 (de) | Herzschrittmacher mit automatisch veraenderlichem a-v intervall | |
DE10012503B4 (de) | Elektrotherapievorrichtung, insbesondere Defibrillator, zur Impedanzabschätzung mit dynamischer Signalverlaufssteuerung | |
DE4013048B4 (de) | Anordnung zur Gewebestimulation | |
DE2314315C2 (de) | Bedarfsgesteuerter atrialer und ventrikularer Herzschrittmacher | |
DE2709281C2 (de) | Vorhofsynchroner ventrikelgesperrter Herzschrittmacher | |
EP0165566B1 (de) | Regelschaltung zur Anpassung der Stimulationsfrequenz eines Herzschrittmachers an die Belastung eines Patienten | |
EP0444021B1 (de) | Herzschrittmacher | |
DE2607443A1 (de) | Verstaerker fuer pulsbreitenmoduliertes signal | |
DE1918605A1 (de) | Schwellwert-Analysator fuer einen implantierten Herzschrittmacher | |
DE2035422C3 (de) | Schaltungsanordnung zur Verarbeitung eines relativ kleinen Nutzsignals | |
DE3237199C2 (de) | Implantierbare medizinische Prothese | |
DE2500109A1 (de) | Herzschrittmacher | |
DE3928809A1 (de) | Schaltungsanordnung zum speisen einer last | |
EP0077802A1 (de) | Herzschrittmacher | |
DE102014214994A1 (de) | Unterdrückung von Gleichtaktstörsignalen bei der Messung von bioelektrischen Signalen | |
DE2628629C3 (de) | Bedarfsherzschrittmacher mit Störerkennungsschaltung | |
DE2456577C3 (de) | Breitbandige Verstärkeranordnung für intermittierende Signale | |
DE3217198A1 (de) | Herzschrittmacher | |
DE836045C (de) | System zur UEbertragung elektrischer Signale mit wiederkehrenden Festpegel- oder Bezugswerten |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
AK | Designated contracting states |
Designated state(s): DE FR GB NL |
|
17P | Request for examination filed |
Effective date: 19830504 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
18D | Application deemed to be withdrawn |
Effective date: 19841108 |
|
RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: RUEPPRECHT, WERNER Inventor name: ROETTER, JUERGEN Inventor name: SCHALDACH, MAX Inventor name: NETTELHORST, HERWIG, FRHR., V. Inventor name: REXHAUSEN, HERMANN |