摘要:
A device for insufflating gas into a corporeal cavity of a human or animal body has a connection for a gas source, a measuring unit provided with sensors for the fill gas pressure and the fill gas flow, which are disposed outside said corporeal cavity, and a control unit, to which the output signal of the sensors are applied, and which triggers a pressure regulator which reduces the fill pressure of the gas source to a pre-set insufflation pressure, and a flow regulator which regulates the fill gas flow to a pre-set desired gas flow value in accordance with first a square function, and then, after reaching the preset flow rate, in accordance with a linear function.
摘要:
A low power current-to-frequency converter circuit provides an output frequency signal F.sub.OUT having a frequency that varies as a function of a low level analog input current signal. The analog input current signal is typically generated by an implantable sensor element, designed to sense a particular substance or parameter within body tissue or fluids to which the sensor is exposed, with the magnitude of the analog signal providing a measure of the sensed substance or parameter. Conversion of the low level analog current to the output frequency signal facilitates transmission of the data signal over a shared data bus and other digital processing of the data signal. The current-to-frequency converter circuit is fabricated from low power FET-based integrated circuits, typically realized on a single integrated circuit chip, and includes an operational amplifier having its positive input terminal connected to a storage capacitor that is charged by the analog input current signal, a voltage-controlled oscillator driven by the charge (voltage) on the storage capacitor that produces the output frequency signal, and a charge pump circuit that pumps a discrete amount of charge off of the storage capacitor during each cycle of the output frequency signal.
摘要:
A tissue stimulating system includes an external transmitter for transmitting a data signal to an implanted stimulator. The implanted stimulator includes a processor for generating stimulation signals for application to a plurality of tissue stimulating electrodes through respective isolated output channels. The implanted stimulator also includes a power supply that extracts a raw power signal from the data signal. A voltage downconverter generates at least four separate voltages from the extracted raw power signal by alternately connecting at least four capacitors in series across the raw power signal, thereby providing at least four output voltages, and then connecting the capacitors in parallel to transfer the charge stored thereon to a storage capacitor, which serves as the power source for portions of the stimulator. A selected one of the output voltages from the voltage downconverter is applied to an isolated refresh voltage capacitor in each output channel, where it controls a voltage controlled current source. The processor selectively monitors the electrodes and/or voltages generated in the stimulator and generates status indicating/measurement signals for transmission to the external transmitter. The external processor receives and processes the status indicating/measurement signals and uses the information therefrom to control the amount of power transmitted to the stimulator.
摘要:
A system for monitoring temperature in a body, the system comprising at least one implantable device, wherein the implantable device(s) is operable to sense temperature in the body and to generate status signals based on the sensed temperature in the body. The system further comprising a system control unit for wirelessly communicating with the implantable device(s), and the system control unit comprising a signal receiver for receiving the status signals, and also a programmable controller for producing notification signals based on the received status signals. A notification unit can alternatively communicate with the system control unit or the implantable device(s) for disclosing the sensed body temperature based on the notification signals.
摘要:
A system and method that facilitates stimulating neural pathways, e.g., muscles and/or associated nerves, of a patient's body for the purpose of therapeutic medical treatment by rehabilitating weakened muscles and using neuroplasticity to retrain sequential muscle movements and/or to provide the ability to directly deliver functional motor movements. Use of the present invention is of particular value for treating a patient following a stroke. More particularly, such systems are characterized by a plurality of discrete devices, preferably battery powered but may alternatively include RF-powered devices as well or in combination, configured for implanting within a patient's body via injection, each device being configured to affect a parameter, e.g., via nerve and/or muscle stimulation and/or to sense a body parameter, e.g., temperature, O2 content, physical position, electrical potential, etc., that operate under control of a system controller that coordinates the sequential stimulation via wireless commands to the implanted devices.
摘要:
A system, method and power/data transmission device comprising a coil having a high Q, a low-voltage driver and a high-voltage driver switchably coupled to the coil. The low-voltage driver and the high-voltage driver are controlled by a microcontroller and switch at about the same time thereby providing a modulated data signal for transmission. Furthermore, the system includes at least one implantable microstimulator coupled to the transmission device.
摘要:
An implantable device and a wireless communication integrated circuit (IC) implementable in the implantable device for communicating with a remote unit, wherein the communication IC is capable of self-initializing, namely initial booting without requiring an external general booting program to force the booting process. Moreover, the implantable device and the communication IC provide for checking of the validity and integrity of any program instructions received from the remote unit for the desired operation of the implantable device. The implantable device and the communication IC therein have power-saving capability in order to extend the operation of the implantable device between battery charges. A further embodiment provides a robust communication IC, whereby signal distortion or interference between the analog and digital components collectively residing on the same communication IC is minimized or eliminated.
摘要:
A communication protocol that is configured to extend the battery life of devices that monitor and/or affect body parameters and is particularly useful in a system comprised of a system control unit (SCU) and one or more implanted devices. Each such implanted device is configured to be monitored and/or controlled by the SCU via a wireless communication channel. The time between battery rechargings is determined by the battery capacity and the device's power consumption. Accordingly, the present invention reduces their average power consumption by reducing the usage duty cycle of their power consuming transmit and receive modes used to communicate with the SCU. By dedicating addressable time slots to each of the implantable devices in the system and limiting their use of receive and transmit modes to time periods proximate to these time slots, the average power consumption is accordingly reduced.
摘要:
A programmable output current source for use within an implantable tissue or nerve stimulator, e.g., an implantable cochlear stimulator or spinal cord stimulator, includes parallel-connected P-FET current source sets connected between a positive voltage rail and an electrode node, and parallel-connected N-FET current source sets connected between the electrode node and a negative voltage rail. The N-FET current source sets include n N-FET current sources, where n is an integer 0, 1, 2, 3, 4, . . . , and wherein each N-FET current source, when enabled, respectively sinks a current 2nI from the electrode node to the negative rail, where I is a selectable fixed current. Similarly, the P-FET current source sets include n P-FET current sources, where n=0, 1, 2, 3, . . . n, and wherein each P-FET current source, when enabled, respectively sources a current 2nI from the positive voltage rail to the electrode node. An individual current pulse is formed by selecting an electrode pair, and enabling a desired combination of P-FET current sources so that a desired total current is sourced to one of the electrodes of the selected electrode pair, and at the same time enabling a corresponding combination of N-FET current sources so that the same total current is sunk from the other electrode of the selected electrode pair. Sequences of current pulses, e.g., biphasic or multiphasic stimulation pulse pairs, are formed by combining individual current pulses having the desired polarity and timing relationship.
摘要:
A cochlea stimulation system includes a patient wearable system comprising an externally wearable signal processor (WP) and a headpiece in electronic communication with an implanted cochlear stimulator (ICS). The ICS comprises eight output stages each having two electrically isolated capacitor-coupled electrodes, designated "A" and "B", circuits for monitoring the voltages on these electrodes, and circuits for both transmitting status information to and receiving control information from the WP. Based upon information received from the WP, a processor within the ICS can control both the frequency and the widths of the output stimulation pulses applied to the electrodes and may select which electrodes to monitor. The ICS receives power and data signals telemetrically through the skin from the WP. To save power, the ICS may be "powered down" by the WP based upon the absence of audio information or "powered up" if audio is present. The WP communicates with the headpiece over a co-axial cable using one frequency for transmitting signals and a second different frequency for receiving signals.