Abstract: A device for invasive use, comprising a support member comprising a flexible material. The support member comprises a layer of a conductive line or pattern thereon. The support member is formed into an elongated tube shape, and the inside of the support member can be sealed from the outside of the support member. An electrically conductive line or pattern extends on the inside of the tube shaped support member, and the support member may comprise a sensing, stimulating and/or processing element. Furthermore, there is described a manufacturing method for the device, a system where the device is a part of the system and the use of the device for invasive use.

Abstract: The invention relates to a sensor and guide wire assembly including a pressure sensor having a plurality of terminals, the sensor being mounted in the distal end region of a core wire. It also includes two to four electrodes for conductance measurement, also provided in the distal end region. Two electrodes are electrically insulated from each other.

Abstract: The invention relates to a sensor and guide wire assembly comprising a pressure sensor having a plurality of terminals, the sensor being mounted in the distal end region of said core wire. It also comprises two to four electrodes for conductance measurement, also provided in the distal end region. Said two electrodes are electrically insulated from each other.

Abstract: A measuring instrument for obtaining an intracardial signal indicative of blood oxygen saturation, which may be used to control the stimulation frequency of a heart pacemaker, has a measuring probe which contains a light transmitter and a light receiver. The light receiver receives light from the light transmitter reflected by the blood. The light transmitter and the light receiver are connected in parallel to an evaluation circuit via two leads. A constant current source is connected in series with the light transmitter. The current generated by the light receiver, indicative of blood oxygen saturation, can be identified by forming the difference between current flowing in the measuring probe and the constant current. A reference measurement to compensate for factors in the total current resulting from the lead resistances and the measuring probe temperature is not necessary.

Abstract: A cardiac pacer which generates pacing pulses at a predetermined pacing rate, includes a device for generating an alternating signal which is unable to pace the heart. The pacing pulses and the alternating signal are transmitted together to the heart. The alternating signal after transmittal to the heart is measured and processed such that a respiratory signal is obtained. The predetermined pacing rate is then varied dependent on the respiratory signal.

Abstract: A method and apparatus for high-resolution digitization of a signal with a large dynamic range employ an analog-to-digital converter having a bit number and having a measuring region which is smaller than the total range of measurement of the incoming signal, the range of measurement being divided into smaller measuring segments which partically overlap, each measuring segment having a size corresponding to the measuring ranges of the analog-to-digital converter. The information from the analog-to-digital converter controls a measurement segment selector such that the signal to be converted into digital form is within the selected segment. A new digital signal value is extrapolated at least from the two last bits from the analog-to-digital converter.

Abstract: A heart pacemaker has a controllable time delay element for setting the time between atrial and ventricular activity (AV time). For terminating tachycardia as quickly as possible with such a heart pacemaker, a detector for detecting tachycardia is provided with the time delay element being driven by means of the detector such that the AV time is altered upon the occurrence of tachycardia. The change in the AV time is selected such that the new AV time is an optimum for terminating tachycardia. After a preselected time, the time delay element returns to the original AV time.

Abstract: Provided in order to avoid or at least reduce the problems produced by the passive electrode of a heart pacemaker system is a layer having a high double layer capacitance at the phase boundary with the bodily fluid. Advantageous to that end is a porous layer comprised of a carbide, nitride or carbonitride of at least one of the metals titanium, vanadium, zirconium, niobium, molybdenum, hafnium, tantalum or tungsten. The layer can also be comprised of activated carbon with a microporous exposed surface. The layer is produced in the simplest manner by means of roughening the existing electrode surface at its active area.

Abstract: A routine is provided in order to be able to terminate a detected tachycardia quickly and reliably, the routine generating a sequence of n stimulation pulses, checking the heart reaction and, under given conditions, changing the sequence until the sequence terminates the tachycardia. The effective sequences are stored in a plurality of registers and are employed in a prescribable order for controlling the stimulation pulses. In addition to the traditional electronics, a heart pacemaker for the implementation of this method contains a tachycardia detector, a memory having N registers for the sequences to be stored, as well as a control logic for the selection of the registers and/or for changing the register values.

Abstract: The exemplary embodiment comprising a signal reception part and a routing device which routes specific signal information for storage to information memories provided for that purpose. The goal of the disclosure is to create such a signal processing means which, given the lowest possible circuit-technical outlay, always prevents an undesired re-programming of information memories with absolute certainty. This goal is inventively achieved in that a locking register is allocated to a memory bank constructed of a plurality of information memories, in which locking register a locking signal can be inscribed for each information memory which is specifically allocated to this information memory, on the basis of which locking signal a change of the stored informational content is made impossible as long as no opening signal for an appertaining information memory is input into the locking register from the outside.

Abstract: In the exemplary embodiments, the processing circuit for supplying the stimulation pulses comprises a series arrangement of capacitors which are chargeable in parallel and dischargeable serially. The goal of the disclosure, given such a heart pacemaker, is to see to the greatest possible variability of the output amplitude given the lowest possible technical outlay. This goal is inventively achieved in that program switches are allocated to the capacitor circuit for interconnecting or, respectively, disconnecting individual capacitors in combination randomly prescribable as needed for parallel charging and/or serial discharge, said interconnection or, respectively, disconnection occurring according to programs of a program generator.