DE2111731A1 - Heart defibrillator with automatic start pulse generator - Google Patents

Description

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I-4765

Registration from “March 12, 1971

"Heart defibrillator with automatic start pulse generator".

The invention relates to a cardiac defibrillator

with a high-voltage pulse generator with at least one electrode for supplying an electrical impulse to a patient and with an operating element that can be operated from the outside coupled arrangement for activating the high-voltage pulse generator .

Such a cardiac defibrillator is from US Pat

U.S. Patent 3 * 19 ^ .877 known. The one described therein Heart defibrillator contains an electrode holder in which a push button is mounted. When pressing this push button if a switch is actuated »whereby a relay is energized, which in turn activates the high-voltage pulse generator. One downside to using one. Switch that is in a circuit causes a conclusion, the fact is that this

109843/1093

PHN. 4765.

Conclusion can also occur due to disturbances, for example due to a short circuit in a supply line. At a· Heart defibrillator can be a not administered on time Defibrillation pulse can have serious consequences, and it is therefore It is important that here in particular one can have a circuit that is protected against interference (self-failsafe).

The aim of the invention is to meet this requirement with simple tools. In addition, a heart def ϊ-ί · brillator of the type mentioned according to the invention indicates that the arrangement for activating the high-voltage pulse generator has an element for converting a mechanical impulse contains in an electrical, with which element the control element by means of a mechanism is coupled to transmit a mechanical impulse.

In the heart defibrillator according to the invention a start pulse emitted by an element for converting a mechanical pulse into an electrical one; this The electro-mechanical element acts as an automatic start pulse generator and cannot, like the known arrangements for Activation of the high-voltage pulse generator by short circuits or such disturbances give a start pulse. The circuit, to which the start pulse is supplied; can easily be sized be that conclusions or other disturbances can never free a sufficient power to act as a starting impulse act.

In a preferred embodiment according to the invention, the operating element and the electro-mechanical

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PHN. 4765

Element in an electrode holder; of the cardiac defibrillator provided. It can be advantageous to mount the control element in such a way that it only occurs after a Minimum pressure on an electrode can be operated.

In a preferred embodiment contains a

electro-mechanical element a piezo-electric material, a hammer when pushing in the control element supplies a mechanical impulse.

Embodiments of the invention are shown in

Drawings shown and are explained in more detail below. Show it:

1 shows a schematic representation in perspective a cardiac defibrillator,

2 shows a section through an inventive

must have an electrode holder with a control element and a electromechanical element, and

3 shows a schematically illustrated circuit diagram for a starting mechanism for the high-voltage pulse generator of a cardiac defibrillator according to the invention.

The cardiac defibrillator shown in FIG

has a housing 1 in which all electronic control means are provided and which is preferably provided with a keyboard 2, with the aid of which the strength of the defibrillation pulse to be emitted can be selected. A knife 3 then indicates, for example, the maximum potential for the pulse to be emitted. The housing 1 with accessories can be designed to be portable, in which case a

■ 109843 / 10-93

PHM. 4765.

Energy source, for example in the form of a 24 V battery, is built in. The housing can also be provided with a connection for an external energy source, both for external energy supply as well as for a possible charging an internal source of energy. Via a high-voltage cable 4, the electrodes 5 and 6, which are preferably part of the

form
Electrode holders 7 and 8 connected to the housing 1. The electrode holders 7 and 8, which are preferably made of an electrically insulating plastic, are provided with the handles 9 and 10, the support edges 11 and 12 and have widened ends 13 and 14 on which the electrodes 5 and 6 are mounted. In a preferred embodiment, small electrodes for use with children are mounted on the electrode holders. Larger electrodes for use in adult patients can then be easily mounted around these small electrodes. In the case of a portable heart defibrillator, both electrode holders are preferably designed with handles. In the case of a cardiac defibrillator for clinical use, one of the electrodes can be mounted on a treatment table, for example. Several electrodes can also be connected with a single handle.

According to the invention, an operating element 15 is mounted in an electrode holder as shown in FIG. which is coupled to an electromechanical converter 16. In a preferred embodiment there is for this purpose, for example, a tension spring 18 coupled with a push button 17,

10 9843/10 93

PHN.

which is tensioned by pressing the push button 17. Another push of the push button releases, for example by means of an inclined side part 19 of the push button 17, a pawl 20 from a lock 21, creating a second tension spring 22, which is also biased by pushing the push button , drives a hammer 23 onto a block of piezoelectric material 24 "The tension spring 18 pushes the hammer 23 back again and thus the pawl 20 back into the lock 21" by the mechanical impulse that the hammer 23 exerts on the piezoelectric material an electrical impulse generates »which is used as a start impulse» It is unimportant for the invention * how the piezo-electric element is composed or how the mechanical impulse comes about. The piezo-electric element can be replaced by a coil made of electrically conductive wire ₍ in which a magnetized material is axially displaceable by means of a control system produce"

Each mechanism _s a mechanical pulse is converted to electric pulse with einefti dertt itself and the mechanical impulse is brought about by engagement of there looking, can be used as Startiitipulsgeber used werdöii "

The operating element is the electrical engineering Converters can also be provided ändörswö in the device, Böiöpieisweise In dom housing 1, usually the doctor is the

PHN. 4765.

Determine the time at which a defibrillation pulse was administered must become; installation in an electrode holder must then be preferred. For internal applications such as During surgery, it is preferable to use a simple shape electrode holder, in which case an assembly in or on a housing can be cheaper. There are always several people present who give the start impulse can give, and the control element then does not need to be within the range of the doctor. To these different The electrode holders make applications as easy as possible easily exchangeable mounted on the housing.

If the patient still has a normal, Heart function are present (auricular vibration), the must Defibrillation pulse in the correct phase for the cardiogram administered. This synchronization is ensured by an electronic circuit that is automatically activated by the cardiogram is put into operation, in that after generating a start pulse, the defibrillation pulse is only activated in the correct » released by the ECG at a certain point in time. The cardiogram recorded during the treatment can be one in the electrode holder light up the mounted lamp, so that the doctor can follow the heart's activity.

Figure 3 is a very schematic illustration of a preferred arrangement of some components for a cardiac defibrillator shown. One by denelßjfctoiromechanischen Transducer emitted potential pulse is fed via a line 30 to a control arrangement 31 and forms for this Control arrangement the start signal, for example, in that

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PHN. 4765.

a transistor is brought out of the blocking state, whereupon a relay 32 is energized, possibly delayed by electronic aids for adaptation to the cardiogram, which cardiogram signal is also fed to the control arrangement 31. This relay 32 actuates a switch mechanism 33 with, for example, two switches Jh and 35 · If the relay 32 is not energized, then the switching mechanism 33 is in the loading position, corresponding to the position shown with a continuous line for the switches Jk and 35 · In this position a capacitor j6, for example with a capacitance of Ϊ6 / uF, is charged via a rectifier element 37 up to a potential of a few kV, up to a maximum of 7 kV, determined by pressing the relevant key on the key panel 2.

The energization of the relay 32 has the consequence that the switching mechanism is placed in the unloading position in that the switches Jh and 35 assume the position shown in dashed lines. The capacitor 35 is now discharged via an inductance 38 of, for example, 0.2 H and a patient lying between the electrodes 5 and 6 ″ in, for example, approximately 5 ms. The switches jh and 35 quickly return to the loading position, and a subsequent defibrillation pulse can be given by pressing the control element.

IQ984371093

Claims (10)

PHN. . - 8 PATENT CLAIMS. (1.J cardiac defibrillator with a high-voltage pulse generator with at least one electrode for delivering an electrical pulse to a patient and with one with one from the outside operable control element coupled arrangement for activating the high-voltage pulse generator, thereby characterized in that the arrangement for activating the high-voltage pulse generator an element (16) for converting a mechanical impulse into an electrical one, with which element is coupled to the operating element (17) by means of a mechanism for transmitting a mechanical impulse is. 2. Heart defibrillator according to claim 1, characterized in that the element for converting .ein mechanical Impulse into an electrical from a coil consists of an electrically conductive wire with a means therein of the operating element axially displaceable, magnetized core. 3. heart defibrillator according to claim 1, characterized dadurbh, that the element for converting a mechanical impulse into an electrical one is a piezo-electrical material (24) contains. 4. heart defibrillator according to claim 1, 2 or 3 »characterized in that the coupling between the operating element and the element for converting a mechanical impulse into an electrical one by the operating element spring to be pretensioned and a spring tensioned 10 9 8 43/1093 PHN, ^ 765. 5. Pulse generator naph claim 1 * 2 or 3 »thereby marked j dags himself, between the pediatric line
And the element for converting a mechanical impulse into a single pneumatic coupling is located. i>, cardiac defibrillator according to claim 1 to 5 »thereby gelf.ennzßi, chnetj that the mechanism for transmitting a mechanical. The momentum can only be activated when a |
a certain # ⁿ iTiiiliM ^ lp ⁿ . experiences counter pressure
Yes El _v ectrQ4e holder, suitable for use In ^a He ^ zdefibriliator naph one of claims 1 to 6 _t , characterized in that this electrode holder is provided with an electromechanical transducer and an external control element for activating this Waridler. Ss Elgktrqdenha.iter j suitable for use In ^ inenj IJerzdefibrillatpr according to one of claims 1 to date || jrch marked that tji _e g _er electrode holder with Display element ζμΐβ display a, ^ ar.d4qgram signal