WO1980000054A1 - Measurement signal transmitter for continuous watching of the mother and the child before and during child birth - Google Patents

Measurement signal transmitter for continuous watching of the mother and the child before and during child birth Download PDF

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Publication number
WO1980000054A1
WO1980000054A1 PCT/EP1979/000047 EP7900047W WO8000054A1 WO 1980000054 A1 WO1980000054 A1 WO 1980000054A1 EP 7900047 W EP7900047 W EP 7900047W WO 8000054 A1 WO8000054 A1 WO 8000054A1
Authority
WO
WIPO (PCT)
Prior art keywords
capsule
meßgebereinheit
characterized
output
signal
Prior art date
Application number
PCT/EP1979/000047
Other languages
German (de)
French (fr)
Inventor
H Czerny
H Schmidt
J Morgenstern
Original Assignee
H Czerny
H Schmidt
J Morgenstern
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to DE19782826391 priority Critical patent/DE2826391A1/en
Priority to DE19782826397 priority patent/DE2826397C2/de
Priority to DE19782826398 priority patent/DE2826398C2/de
Priority to DE2826391 priority
Application filed by H Czerny, H Schmidt, J Morgenstern filed Critical H Czerny
Publication of WO1980000054A1 publication Critical patent/WO1980000054A1/en

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Classifications

    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00Detecting, measuring or recording for diagnostic purposes; Identification of persons
    • A61B5/68Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient
    • A61B5/6801Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient specially adapted to be attached to or worn on the body surface
    • A61B5/683Means for maintaining contact with the body
    • A61B5/6831Straps, bands or harnesses
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00Detecting, measuring or recording for diagnostic purposes; Identification of persons
    • A61B5/0002Remote monitoring of patients using telemetry, e.g. transmission of vital signals via a communication network
    • A61B5/0004Remote monitoring of patients using telemetry, e.g. transmission of vital signals via a communication network characterised by the type of physiological signal transmitted
    • A61B5/0011Foetal or obstetric data
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00Detecting, measuring or recording for diagnostic purposes; Identification of persons
    • A61B5/43Detecting, measuring or recording for evaluating the reproductive systems
    • A61B5/4306Detecting, measuring or recording for evaluating the reproductive systems for evaluating the female reproductive systems, e.g. gynaecological evaluations
    • A61B5/4343Pregnancy and labour monitoring, e.g. for labour onset detection

Abstract

With a view to continuous watching of the mother and the child before and during child birth, a capsule (10) is placed on the lower part of the abdomen of the mother. This capsule contains a measurement signal generator (20, 22, 32, 42, 54, 56) which provides more than two data concerning the status of the mother and the child, for example, the ECG, the work of the child birth, the temperature of the skin, the hart beats of the foetus. These data are converted into pulses at determined repetition frequency by clock pulses by means of a multiplexer (64) and a modulator in the width of the pulses (68). This pulses are transmitted to a receiver (57) by a transmitter (16) placed into the capsule (10), transformed into analog signals and transcribed by a potentiometric register (58). The width of the pulses is limited by a time limitation circuit (78-84), at a value which is smaller than the time spacing of the clock pulses. The potentiometric register (58) comprises a capacitive-mechanical divider (110) acting as a detector for the balancing of the deviation of the register. This divider is connected so that the progress in temperature and the linearity of the components entered later should not be critical.

Description

Meßgebereinheit ongoing monitoring of mother and child before and during birth

technical field

The invention relates to a Meßgebereinheit for the continuous monitoring of mother and baby before and during childbirth comprising: a mountable on the abdomen of the mother capsule placed in the capsule measuring sensors that provide measurement data about the status of mother and child, means for transmitting the measurement data and Registrier¬ medium for recording the transmitted measurement data.

Related Background Art Known measuring sensors of this type are, adapted to determine measurement data of a maximum of 2, namely filial (fetal) ECG and labor. These are from a transmitter (telemetry transmitter) transmitted with two channels, which is relatively large volume and is separated from the Meßqebern. The known arrangement requires cable connections on the abdomen of the mother. This allows the mother's freedom of movement is impaired, which is required for modern methods of Geburtsleitunq.

The object underlying the invention is to form a Meßqeber- unit of the type defined at the outset so that the mobility and convenience of the mother by the Meßgebereinheit as little as possible and a larger number of data measured may be transmitted and recorded.

Disclosure of the invention.

According to the invention this is achieved in that (a) containing the capsule measuring sensor for several nachstehen¬ the variables: fetal (infantile)

and maternal ECG, fetal heart sound, labor, maternal breathing, maternal skin temperature, locating the fetal throatpiece fold, the child and fetal thorax movement movements

(B) the means for transfer of measurement data from a transmitter, which is arranged in the capsule and a remotely located receiver thereof are formed unit,

(C) the signals of the individual measuring sensors by means of a controlled clock pulses multi- plexer successively lator connectable to a Pulsbreitenmodu¬ and so are converted into pulses -whose widths depend on the respective signals, which pulses are transmitted from the transmitter.

(D) a power source to supply both the measuring transmitter as the transmitter and the upstream transmitter is Signalauf- preparation means are provided in the capsule further

(E) registration means whose deflection is sensed by a Weqgeber and returned to the input signal are formed by a Kompensations¬ recorder.

The Meßgebereinheit including highly miniaturized transmitter and measuring sensors is thus arranged in a relatively small capsule which can be -befestigt without disturbance of the nut on the abdomen and transmits the measured data to a Überwachunqsstation.

Further embodiments of the invention are the subject of the dependent claims.

O BRIEF DESCRIPTION OF DRAWINGS

The invention is explained in more detail below using an exemplary embodiment with reference to the accompanying drawings:

Fig. 1 shows schematically a section through the capsule.

Fig. 2 shows the measurement data provided for transmitting the circuit arrangement for Mehr¬ channel signal transmission.

Fig. 3 shows the signal waveforms at various points in the circuit arrangement.

Fig. 4 schematically shows the perspective-Auf¬ construction of a mechanically-capacitive divider for tapping the deflection compensation of the recorder and

Fig. 5 shows a corresponding circuit.

Best way to practice the invention. , ,

The Meßgebereinheit has a capsule 10 with a bottom 12th The bottom 12 of the capsule which rests on the abdomen 14 of the nut is slightly concave in shape and flexible. In the capsule at the top of a highly miniaturized transmitter 16 ange¬ with power supply arranged, wherein the power source for the transmitter and the measuring transducer supplies.

In the signal present at the abdomen of the mother base 12 of the capsule sitting three electrodes for receiving the ECG of the child and the mother. Further, in the central on the abdomen of the mother anliegendenBoden 12 of the capsule 10, an electrical temperature-measuring sensor 20 in the form of an S JTF

O PI PTC resistor arranged. In the bottom 12 of the capsule is further arranged an ultrasonic transmitter and receiver 22 ange¬, which is a part of an ultrasonic Doppler¬ device 24, which serves as a measuring sensor for locating the fetal heart. The ultrasonic transmitter and -empfäng 22 is disposed annularly around the temperature-measuring sensor 20 around on the bottom of a can-shaped intermediate housing 2, which contains the electronic components of the temperature-measuring transducer 20 and the ultrasonic Dopplerein- direction 24th The intermediate housing 26 is connected via a central pin 28 with a further intermediate housing 30 which is centrally located in the capsule. In the intermediate casing 30, a piezoelectric element sits 32, as a sound-measuring sensor for receiving the fetal heart sound serving on the intermediate housing 30 and the pin 28 as well as the intermediate housing 26 is the piezoelectric element in schall¬ conductive contact with the capsule bottom 12. At the intermediate housing 30 sits flush with the pin 28, a pin 34 the tip of which rests 36 on a spring sheet-metal strip 38, which is clamped at its other end by means of a clamping device 40 in the capsule. The spring plate strip 38 carries a measuring sensor 42, for example in the form of Dehnungsmeßstreif n, the sheet metal strip on the deflection of the Feder¬ 38 responds. The intermediate housing 30 is axially movable halfeert ge in the capsule 10 by a spring diaphragm 44, and also the pin 34 with the bottom 12 of the capsule 10 is thus movable longitudinally. The transducer 42 is responsive to enable the deflection of the base relative to the other parts of the capsule 10th This deflection provides a measure of the uterine tension and thus for the labor.

The capsule 10 is secured to the lower body 14 of the nut by means of an elastic band 46th The ends of this strip are attached to the ends of a resiliently flexible strip 48, the other vonein¬ mounted on two spaced on the outside of the capsule 10 is supported cutting 50,52. On the strip 48 are π O 54.56 measuring sensors, for example in the form of strain gauges attached, responsive to the deflection of the strip 48th The deflection of the strip 48 takes place in accordance with the tension of the elastic belt 46, which in turn varies by the respiratory activity of the nut.

The signals of the transmitter 16 are assembly 57 received and converted into analog output signals that are drawn up by a potentiometric recorder 58 from a Empfänger¬.

For the remote transmission of the signals, it is advantageous if the signals by a pulse width modulator into a proportional pulse width, ie duration of a pulse, to be implemented. Such Pulsbreitenmodu¬ lation has the advantage that the information is retained regardless of changes in amplitude, such as may occur in the Fern¬ transmission in the transmitted signal. When multiple signals are to be transmitted on a channel, then these signals are switched sequentially on a Puls¬ width modulator by a multiplexer, and converted into a series of pulses, wherein the width of each pulse is analogous to one of the signals. Between each series of pulses there is a pause as a reference mark to allow empfäήgerseitig the assignment of the pulses to the different signals.

The multiplexer is practically a number of (electronic) switches, each of which included a ge by a counter in response to the count is. The counter is acted upon by clock pulses of a clock generator. the various signals are applied to a common output line sequentially through the switches, which is guided in a circuit arrangement of the present kind to the pulse width modulator. In known circuit arrangements for multi-channel signal transmission with pulse width modulator, the problem arises that a signal whose amplitude exceeds a certain level, which can generate such a broad pulse that this pulse extends into up to the assigned to the next signal time interval. There is then a crosstalk from one channel to the adjacent channel.

It has been attempted to solve this problem in that the signals at the input or output of the multiplexer be limited value by amplitude-limiting members to a Maximal¬. However, the characteristic such amplituden¬ limiting members is before reaching to which the amplitude is limited the threshold value, non-linear, so that a corresponding non-linearity of signal transmission is obtained.

In order to avoid in a circuit arrangement of the type defined at the optimum utilization of the property for the individual signals to time intervals cross-talk between the individual channels, without non-linearities occur in the signal transmission, in the preferred embodiment, a time limit circuit is provided by which the width of the pulses is limited to a value which is smaller than the time interval of the clock pulses. Thus, not made a limitation of the pulse widths in um¬ clogging signal amplitudes, but by a limiter Zeit¬ directly limiting the pulse width itself. Such a time limit circuit can be constructed with simple means and does not cause non-linearities.

The "will be described below with reference to Figures 3 and 4. FIG.

OM The circuit arrangement contains a clock generator 60, the clock pulses ~ - (Fig. 3) returns. The clock pulses A are counted into a counter 62nd The counter 62 controls a multiplexer 64 which is virtually a number of, for example nine electronic switches, wherein each stored in the counter 62 a number of associated switch is closed. over each of the switches is a zuge¬ impaired input signal a, b, c ... i with a common Signal¬ output 66 of the multiplexer 64 connected.

The pulse width modulator 68 includes a current source 70 through which a capacitor 72 is charged. In parallel with capacitor 72 is a controlled switch 74, which is formed in practice by an electronic component and via which the capacitor 72 can be discharged. The voltage applied to the capacitor 72 voltage rises when the switch 74 linearly with time. This voltage is connected to one input of a comparator 76th At the other input of the comparator 76 of the output 66 of the multiplexer 64, so that each of these output 66 durchge switched signal is. With each clock pulse A switch 74 is still closed _in vorüber¬ continuous manner to be described. The capacitor 74 is discharged and the capacitor voltage increases linearly with time. The comparator 76 is in a first switching state when the capacitor voltage is less than the voltage applied in this time interval the signal voltage, and passes into a second switching state when the capacitor voltage reaches the signal voltage. The period of time during which the comparator is in the first switching state of the Signal¬ 76 is proportional voltage and determines the pulse width of an output pulse. 1 If one were to constantly switch immediately as in the prior art / the output 66 of the multiplexer 64 to the Komparato 76 so at a high voltage signal cross-talk may take place from one channel to another Instead. 5 The voltage across capacitor 72 then reaches during the time interval of one clock pulse to the next, during which the multiplexer 64 is applied said signal voltage at the output 66, not the level of the signal voltage, so that the comparator would remain in the first switching state. The pulse would go to the next caused by the signal voltage pulse following without downshifting. In the illustrated circuit is avoided.

The clock pulses of the clock generator A 60 abut with their leading edges at a monostable multivibrator 78, each of which provides a pulse B. This pulse B is again switched to the "Reset" input of a bistable multivibrator 80th On the other hand, the pulse B abuts with its rear edge at a monoethylenically shot multivibrator 82 which generates a pulse C. This pulse C is given on the "Set" input of flip-flop 80th The flip-flop 80 is thus, as shown in Fig. 3 by the signal D, normally set, and only during a short time interval beginning with the leading edge of the clock pulse A and ending with the trailing edge of the pulse B is reset. This signal D is inverted by an inverter 84, and controls the switch 74 0 so that the switch 74 is closed during that said time interval.

The output signal C of the flip-flop 80 remains above an AND gate 86 at a 5 monostable multivibrator 88. On the second input of the AND gate 86 is via an inverter 90, an output 92 of the counter 62, to which an output signal when the counter reaches ten the counter 62 occurs. While

OM of the first nine clock pulses occurs at the output 92, no signal, so that then as a result of the inverter 90, the AND gate is connected through 86th The AND gate 86 provides the signal G in Fig. 3. The monostable toggle circuit 88 provides a pulse H, whose Vorder¬ edge with the trailing edge of the signal G coincide. This pulse H collides with its rear edge to a mono multivibrator 92nd In addition, the pulse H to the "Set" input of a flip-flop 94 is connected. The output signal of the comparator 76 is applied to the "reset" input of flip-flop 94th

The monostable multivibrator 92 supplies a pulse I, leading edge which coincides with the trailing edge of pulse H and. the duration of which is dimensioned such that it ends before the leading edge of the next clock pulse A. From this pulse I, a switch 96 is controlled, which is connected between the output 66 of the multiplexer 64 and the comparator 76th

The output signal J of flip-flop 94 is at an output 98 of the circuit arrangement and outputs the signals to the signal inputs in the form of a sequence of pulses again, whose pulse width is proportional normaler¬ as the signals.

The circuit arrangement described operates as follows:

By the inverted signal D of the switch 74 is closed and the capacitor 72 discharged. At the end of the pulse thus generated, the switch 24 opens again and the capacitor 72 is charged by the current source 70 linearly with time, as shown by the signal E in Fig. 3. This signal E is at an input of the comparator 76. With a by the monostable multivibrator H vor¬ given delay after the re-opening the switch 74 of the switch 96 is closed, and set the signal from the output 66 of the multiplexer 64 at the 'input of the comparator 76 , This signal is normally greater than the voltage that has been built up until then at the capacitor 72nd

For the duration of pulse H is then the signal at the lower input of the comparator 76 is zero, while the capacitor 72 a voltage is applied. The comparator 76 is in the aforementioned "second" switching state. After applying the signal voltage across the switch 76 this signal voltage is greater than the voltage that has been built up until then at the capacitor 72nd The comparator 76 goes in the "first" status. In this switching state of the comparator 76 remains until the voltage has reached the voltage on the capacitor signal 72nd Then, the comparator 76 returns to the "second" switching state.

The flip-flop 94 is set by the leading edge of pulse H, immediately after reopening of the switch 74 and the start of the rise of the signal E..Sie is reset when downshifting of the comparator 76 when the rising voltage E across capacitor 72, the has reached signal voltage. The pulse width of the signal supplied by the flip-flop 94 J pulse is therefore strictly proportional to the signal voltage.

If the signal voltage so large that during the available time interval, the voltage present at capacitor 72 voltage E is not equal to the signal voltage, the signal voltage is switched off after a vorge given time within the time interval between successive clock pulses through the switch 96, that is, the on the lower input of the

WI comparator 76 given signal becomes zero. Thereby, the comparator 76 goes back in any case after the expiry of the pulse I in its second switching state, and accordingly, the flip-flop 94 is reset.

The mono-flop 92 delays the up circuit of .SignalSpannung against the closing of the switch 74, thus ensuring defined by small differences in the switching times independent conditions.

When the counter 62 jumps to "ten", a signal at the output 92 of the counter 62 which, via inverter 40, as shown 'in "F" in Fig. 2, which disables AND gate 86. Appear Therefore, during the tenth clock or time interval of the pulse G is eliminated. It is thereby 88 do not abut the monostable multivibrator ange¬, whereby neither the flip-flop 94 is set, even a voltage across the switch 96 to the comparator 76 is applied. It therefore occurs during the tenth clock a pause at the output 98 on which a mapping of the individual pulses to the Signalein¬ J junctions a, b, c ... i permitted.

The writer 58 must record relatively fast repetitive pulsing signals. In a Kompen¬ sationsschreiber with a conventional Poggendorf- circuit in which a potentiometer is used as a displacement sensor, which would have as a result of friction drawing a uner¬ desired delay and distortion of the Auf¬ and rapid wear of the Potentio¬ meters result. It is therefore in the preferably used Schreiber as a capacitive displacement sensor displacement sensor, which picks up the scales of the writer.

OMPI / .. WIPO - There are capacitive displacement sensor with a capacitive divider mechanisch¬ known, in which for operation in the straight-ahead which is rectified at the divider by means of a voltage tapped Auskoppelüber¬ wearer and drives a power amplifier. In these known transducers, the linearity of the transducer depends on the linearity of the divider downstream components. The temperature response of these components is fully as an error into the measurement. Even a relatively costly transformer is required.

It is furthermore a capacitive transducer is known in which a mechanical-capacitive divider is arranged in an alternating current bridge. The counter of the divider opposite the bridge branch formed by capacitance diodes, that is, the capacity, are variable in dependence on a control voltage. The Brücken¬ diagonal voltage is tapped via a Auskoppelübertrager and rectified. The resulting DC voltage is rectified and smoothed to a

given power amplifier which supplies an output current. This output current is also fed back to the capacitance diodes so that the Gleich¬ direction, smoothing and power amplification bring any mistakes. "In this known capacitive Weg¬ Suited thus the capacitance changes of the mechanical-capacitive divider are compared in the bridge circuit diode with capacitance changes of the Kapazitäts¬ , Consequently, the capacitance diodes determine the linearity and temperature response of the capacitive transducer Weg¬, which occur despite the feedback linearity error. It is therefore an individual mechanical intervention at the capacitive tap necessary to compensate for such linearity error. In addition, a pair of capacitance diodes is' erforder¬ Lich to obtain couples with the same temperature response. In this known transducer a kosten¬ consuming Auskoppelübertrager is required.

OM To avoid these disadvantages there is provided for the recorder 58 in the preferred embodiment, a capacitive transducer in which the tap to the non-inverting input of an as-formed Operationsver- stärker. differential amplifier is connected to its inverting input via an ohmic Wider¬ stood is connected to ground, wherein said further directed gleichge¬ via a diode, the output of the differential amplifier and is connected to the smoothing on a capacitor with parallel resistor, further comprising on the voltage applied to the capacitor DC voltage for a multi-stage amplifier for producing a DC output voltage a Signal¬ output is amplified and in which, finally, the DC output voltage is fed back via an ohmic resistance in the sense opposite coupling to the inverting input of the differential amplifier.

It turns out that with such an arrangement, the dropped at the tap AC voltage can be linear and dependent unab¬ implemented by the characteristics and the temperature coefficient of the components into an output direct current or a Ausgangsgleiphspannung. an AC voltage to the DC feedback signal is compared at the input of the differential amplifier. This is possible because only the DC average of the applied AC voltage is used in the subsequent signal processing. The mechanical-capacitive divider can be produced sufficiently linear and reproducible. It is not a decoupling transformer er¬ conducive.

Such a capacitive transducer is shown in Figures 4 and 5. FIG.

The mechanically-capacitive divider 110 includes a pair of rectangular, mutually insulated Konden¬ sator plates 112,114 that are arranged parallel to each other with a free gap 116 therebetween. The capacitor plates 112 and 114 are obliquely divided, namely by a respective diagonal to each plate Kondensator¬ 112,114 extending slot 118 and 120. The slots 118 and 120 parallel to each other. Through the slot 118, the capacitor plate 112 is divided into two triangular portions 122 and 124th Through the slot 120, the capacitor plate 114 is divided into two triangular parts 126 and 128th

An AC voltage generator 130 is connected to a terminal connected to a line 132 and with another terminal to a line 134th The line 132 is connected via a branch line 136 with the part 122 of the capacitor plate 112 and through a branch line 138 with the part 128 of the capacitor plate 114th The line 134 is connected via a branch line 140 to the line portion 124 of the capacitor plate 112 and a Zweig¬ 142 with the part 128 of the capacitor plate 114 are connected. The parts thus form a 122.126 Konden¬ sator, which is applied with a polarity to the Wechselspannungs¬ generator 130, and the parts 124.128 form a capacitor, which is with this opposite polarity to the AC voltage generator 130th

Between these capacitor plates 112 and 114 has an elongated rectangular intermediate plate 144 is disposed which is movable in accordance with the deflection of the stylus 58 in the direction of the double arrow 146th This intermediate plate 144 forms a tap of the mechanisch¬ capacitive divider 110, to which a Wechsel¬ is tapped voltage whose. Amplitude depends linearly sator 144 plates of the way of the intermediate plate relative to the Konden¬.

O. The tap WI formed by the intermediate plate 144 is located at the non-inverting input 146 of an operational amplifier configured as a differential amplifier 148. The input 146 of the differential amplifier 148 is high impedance, and the differential amplifier 148 is leer¬ continuously. The output signal of the differential amplifier 148 is rectified by a diode 150 and connected to the smoothing capacitor 152 with a resistor is switched parallelge¬ 154th There is thus generated a smoothed DC voltage. This smoothed DC voltage is amplified by a multi-stage amplifier 156 for generating a voltage at a signal output Ausgangsgleihh- 158th The amplifier 156 includes a transistor 160 whose base is located on the capacitor 152 and a transistor 162 having its base connected to the collector of the transistor 160 ". The transistors 160,162 effect a power gain.

The voltage or current at the output 158 ​​is coupled through a resistor 164 to the inverting input 166 of the differential amplifier 148th This input 166 is connected in a conventional manner through a resistor 168 to ground. About the formed by the resistors 164 and 168 a voltage divider Rück¬ occurs guide the highly amplified output DC voltage to the inverting input 166 of the differential amplifier 148, by which the influence of non-linearities and variations of the electronic components is suppressed.

In practice, the parts are 122.124 and 126.128 of the capacitor plates 112,114 from copper cladding on insulating plates 170,172.

OMPI, IIPPOO

Claims

claims
1. Meßgebereinheit ongoing monitoring of mother and child before and during birth, including:
an attachable on the abdomen of the mother capsule placed in the capsule measuring sensor, the measurement data about the status of mother and child supply,
Means for transmitting the measurement data, and
Recording means for recording the transmitted
Measurement data, characterized in that
(A) the capsule (lθ) measuring transducer for several of the nach¬ property variables comprising: fetal (infantile) and maternal ECG, fetal heart sound, labor, maternal breathing, maternal skin temperature, locating the fetal heart valve, movement of the child and fetal thoracic motion,
(B) the means for transmitting the measurement data from a transmitter (l6) which is arranged in the capsule reasonable (lθ), and removed therefrom ange¬ arranged ngereinheit receiver (57) are formed,
(C) the signals of the individual measuring sensors by means of a controlled by clock pulses multiplexer (64) sequentially up switchable to a Pils width modulator and so are in pulses to implement, whose widths depend on the respective signals nts, it being possible for these pulses from the transmitter transmitted who ¬,
(D) in the capsule (lθ) further comprises a power source for supplying both the measuring transmitter as the transmitter and the transmitter of the upstream Signalauf-
OM preparation means are provided,
(E) the registration means by a scribe Kompensations¬ (5δ) whose deflection is sensed by a displacement sensor and ührt Retired to the signal input are formed.
2. Meßgebereinheit according to claim 1, characterized gekennzeich¬ net that in the in the abdomen (l4) of the nut anlie- constricting bottom (12) of the capsule (lθ) electrodes (lδ) "sit for receiving the ECG.
3. Meßgebereinheit according to claim 1, characterized gekennzeich¬ net that in the in the abdomen (l4) of the nut anliegen- the bottom (12) of the capsule (10), an electric Tempe¬ temperature-measuring sensor (20), eg in the form of a PTC -Wider- stands, is arranged.
4. Meßgebereinheit according to claim 1, characterized gekennzeich- net that in the floor (l2) of the capsule (lθ) Ultra¬ a sound transmitter and receiver (22) as part of a Doppler ultrasound device (24) is arranged which as a measurement transmitter for location of the fetal heart is used.
5- Meßgebereinheit according to claim 1, characterized gekennzeich¬ net, that the bottom (l2) of the capsule (10) is flexible and a measuring sensor (42) is provided, which on the deflection of the base (12) relative to the rest of the capsule (lθ) speaks as signs of labor an¬.
6. Meßgebereinheit according to claim 1, characterized gekennzeich¬ net that in the capsule (10) and in schalleitendem contact with the capsule base (12), a piezoelectric element
is arranged (32) which serves as a sound-measuring sensor for receiving the fetal heart sound.
OMPI IPO. 7 Meßgebereinhei t according to claim 3, characterized gekennzeich¬ net, that the capsule (LO) in the abdomen (l4) of the Mitter mi ttels an elastic band (46) attached to i st,
that the ends of the band (46) are attached to the ends of an elastically flexible strip (48) mounted on two spaced-apart on the side of the capsule Außen¬ (lθ) cutting edges (50 '52) is supported, and
that a measuring sensor (5 ^ 5 ") is provided which is responsive to the deflection of the strip (48).
8. Meßgebereinheit according to claim 1, characterized gekennzeich¬ net, that a time limit circuit (42,46) is seen vorge by which the width of the width modulator of the Puls¬ AIIF pulses generated from the Meßgebersignalen a value are limited, is smaller than the is time interval of the clock pulses (A).
9- Meßgebereinheit according to claim 8, wherein the pulse width modulator comprises a current source and a capacitor which auflad- from the power source bar and, a switch can be discharged, and a comparator to which the one hand a Signal¬ voltage of the multiplexer and on the other hand the capacitor voltage applied is switched,
characterized,
that the time limit circuit includes a controlled switch (96) via which the signals from the multiplexer (62) to the comparator (76) au switchable are bar, and
O that the controlled switch (96) from a monoethylenically multivibrator (92) is controlled, according to which each clock pulse (A) is initiated and back tilts in each case before the next clock pulse.
Gekennzeich¬ net, in that each clock pulse having its leading edge abutting 10. Meßgebereinheit according to claim 9 'characterized a first monostable multivibrator (78) which in turn abuts with its trailing edge a second monostable multivibrator (82)
that a bistable flip-flop (8θ) is provided, 'which is reset each of the leading edge of pulse Ausgangs¬ (b) of the first monostable multivibrator (78) and of the leading edge of
Output pulse (C) of the second monostable Kipp¬ circuit (8 "2) is set back, and that of the output signal (D) of the bistable flip-flop (8θ) via an inverter (84) to be the condensation sator parallel (72) disposed switch (74) is controlled.
11. Meßgebereinheit according to claim 10, characterized gekenn¬ characterized in that the output signal (D) of the bistable flip-flop (8θ), which (7 ^) controls the switch in parallel with the capacitor (72) with its edge Rück¬ at the same time a third monostable Kippschal¬ device (88) abuts, the output pulse (H) with its leading edge a of the output pulse (J) delivered flip-flop (94) constitutes with its back edge of the monostable multivibrator (92) abuts, the said switch (96) between Multi¬ plexer (64) and comparator (76) controls and that the output of the comparator (76) to the reset input of the output pulse (J) providing the flip-flop (9 ^) is applied. 12. Meßgebereinheit .After claim 11, characterized gekenn¬ characterized in that the multiplexer (64) cooperates with a counter (62) into which the counts clock pulses einge¬ and (from the switch in the ver¬ different signal channels a, b, c, ... i are controlled), and in that the output signal of the switch (74) controlled bistable flip-flop (8θ), the third monostable multivibrator (88) via an aND gate (86) abuts, at whose other input a carry signal of the counter (62) via an inverter (90) is applied.
13- Meßgebereinheit according to claim 1, characterized gekenn¬ characterized in that
(A) of the displacement sensor of the compensating recorder is constituted by a capacitive transducer comprising a fed by a Wechselspannungs¬ source, to a tap provided mechanically-capacitive divider (llO), whose divider ratio can be changed depending on the Aus¬ impact of the compensation recorder,
(B) the tap to the non-inverting Ein¬ passage (L46) of an operational amplifier configured as a differential amplifier (L48) is connected ver¬ whose inverting input (166) via an ohmic resistor (L68) is connected to earth,
(C) the output of the differential amplifier (L48) through a diode (150) is rectified and for smoothing a capacitor (150) with parallel resistor
is connected (15 ^),
- £ FRE
Figure imgf000022_0001
OMPI - (d) at the capacitor (152) adjacent Gleich¬ is amplified voltage via a multistage amplifier (156) for generating a DC output voltage to a signal output (158) and
(E) the output DC voltage via an ohmic resistor (L64) is in the opposite sense of coupling to the inverting input (166) of Differenz¬ amplifier (L48) is recycled.
10
14. Meßgebereinheit according to claim 13, characterized gekenn¬ characterized in that the mechanical-capacitive divider (110) divided by a pair of obliquely gegenein¬ other insulated capacitor plates (112,114)
contains 15 which abut against the AC voltage source (l3θ), and serving as a tap between these capacitor plates (112,114) to the deflection of the compensating recorder (58) adjustable intermediate plate (l44).
20th
25
30
35
PCT/EP1979/000047 1978-06-16 1979-06-15 Measurement signal transmitter for continuous watching of the mother and the child before and during child birth WO1980000054A1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
DE19782826391 DE2826391A1 (en) 1978-06-16 1978-06-16 Mother and child birth monitor - has capsule with electrodes and containing data emitter for mother and child
DE19782826397 DE2826397C2 (en) 1978-06-16 1978-06-16
DE19782826398 DE2826398C2 (en) 1978-06-16 1978-06-16
DE2826391 1978-06-16

Publications (1)

Publication Number Publication Date
WO1980000054A1 true WO1980000054A1 (en) 1980-01-24

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Country Status (2)

Country Link
EP (1) EP0016052A1 (en)
WO (1) WO1980000054A1 (en)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0118417A1 (en) * 1982-04-22 1984-09-19 DURLEY, Benton A. III Portable ultrasonic doppler system
FR2569975A1 (en) * 1984-09-11 1986-03-14 Fournier Montgieux Francois Device for the continuous detection of respiratory rate, particularly for the prevention of sudden infant death by respiratory arrest during sleep
WO1987001573A1 (en) 1985-09-11 1987-03-26 Société Anonyme Agritronics Monitoring method and device intended particularly to parturition and application thereof
EP0262976A2 (en) * 1986-10-02 1988-04-06 Edward H. Hon External uterine contraction monitoring device
GB2287323A (en) * 1994-03-12 1995-09-13 Hewlett Packard Gmbh Transducer for measuring contractions during labour
US5749831A (en) * 1997-06-23 1998-05-12 Baker; Donald A. Fetal cardiac monitoring utilizing umbilical blood flow parameters and heartbeat information
WO1999065004A1 (en) * 1998-06-11 1999-12-16 Mushroom Biomedical Systems (Proprietary) Limited Person monitoring apparatus
WO2007137671A2 (en) * 2006-05-26 2007-12-06 Christian Chaussy System for the stimulation of organs, e.g. the heart
EP2604183A1 (en) * 2011-12-16 2013-06-19 General Electric Company Method and arrangement for detecting movement artifact from bioelectrical signals measured from the head of a patient

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH449172A (en) * 1964-12-17 1967-12-31 Kurt Dr Med Sokol An apparatus for producing Phonokardiogrammen of fetuses
DE1908652A1 (en) * 1969-02-21 1970-09-03 Licentia Gmbh A system for automatically monitoring at least one of at least one patient Koerperfunktion
US3913563A (en) * 1974-03-08 1975-10-21 Medical Instr & Technology Contraction monitor

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Publication number Priority date Publication date Assignee Title
CH449172A (en) * 1964-12-17 1967-12-31 Kurt Dr Med Sokol An apparatus for producing Phonokardiogrammen of fetuses
DE1908652A1 (en) * 1969-02-21 1970-09-03 Licentia Gmbh A system for automatically monitoring at least one of at least one patient Koerperfunktion
US3913563A (en) * 1974-03-08 1975-10-21 Medical Instr & Technology Contraction monitor

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Title
IEEE Proceedings of the 23rd Annual Conference on Engineering in Medicine and Biology, Volume 12, 16-19 November 1970, New York M.R. NEUMANN: "A Telemetry System for Fetal Intensive Care During Labor and Delivery", siehe Seite 85. *
IEEE Transactions on Bio-Medical Engineering, Volume BME-17, Nr. 4, Oktober 1970, New York H.R. SKUTT et al.: "A Multichannel Telemetry System for Use in Exercise Physiology" Seiten 339-347, siehe Seiten 339-342, die Abschnitte "Abstract" und "Transmitting System". *

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0118417A1 (en) * 1982-04-22 1984-09-19 DURLEY, Benton A. III Portable ultrasonic doppler system
EP0118417A4 (en) * 1982-04-22 1986-06-12 Cryomedics Portable ultrasonic doppler system.
EP0178197A1 (en) * 1984-09-11 1986-04-16 François Fournier Montgieux Respiration rate monitor, especially adapted to detect apnea of infants
FR2569975A1 (en) * 1984-09-11 1986-03-14 Fournier Montgieux Francois Device for the continuous detection of respiratory rate, particularly for the prevention of sudden infant death by respiratory arrest during sleep
WO1987001573A1 (en) 1985-09-11 1987-03-26 Société Anonyme Agritronics Monitoring method and device intended particularly to parturition and application thereof
EP0262976A3 (en) * 1986-10-02 1988-11-17 Edward David Hon External uterine contraction monitoring device
EP0262976A2 (en) * 1986-10-02 1988-04-06 Edward H. Hon External uterine contraction monitoring device
GB2287323B (en) * 1994-03-12 1998-03-25 Hewlett Packard Gmbh Transducer
GB2287323A (en) * 1994-03-12 1995-09-13 Hewlett Packard Gmbh Transducer for measuring contractions during labour
US5749831A (en) * 1997-06-23 1998-05-12 Baker; Donald A. Fetal cardiac monitoring utilizing umbilical blood flow parameters and heartbeat information
WO1999065004A1 (en) * 1998-06-11 1999-12-16 Mushroom Biomedical Systems (Proprietary) Limited Person monitoring apparatus
WO2007137671A2 (en) * 2006-05-26 2007-12-06 Christian Chaussy System for the stimulation of organs, e.g. the heart
WO2007137671A3 (en) * 2006-05-26 2008-02-21 Christian Chaussy System for the stimulation of organs, e.g. the heart
EP2604183A1 (en) * 2011-12-16 2013-06-19 General Electric Company Method and arrangement for detecting movement artifact from bioelectrical signals measured from the head of a patient

Also Published As

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