摘要:
A method and system for response to ambient noise in implantable pulse generator. At least one cardiac signal is sensed with an implantable pulse generator. Cardiac depolarizations are identified in the at least one cardiac signal and cardiac depolarization markers are generated. The at least one cardiac signals are then analyzed for a noise event during a refractory period following the detected cardiac depolarization. The refractory period includes a noise window interval during which noise events are recognized. When a noise event, or events, occur during the noise window interval a first noise marker is generated. The noise window interval is then repeated as long as noise is detected in the noise window intervals. When the noise persists for a predetermined time interval a second noise marker is generated.
摘要:
A mixing fin assembly adapted to mix and guide materials in a rotatable mixing drum of a type used in a transit concrete mixing vehicle includes a spiral mixing fin designed to extend transversely into the drum constructed of a lightweight, moldable polymeric material which is flexible and resistant to abrasion, the mixing fin includes a plurality of conjoined sections that are fit together, preferably utilizing fin locking tabs and mating fin locking sockets. A preferred way of mounting the mixing fin into mixing drums uses a spiral fin mount rail track adapted to be fixed to the interior surface of the mixing drum. A locking tab locks the upper part of the rail track into the fin structure.
摘要:
A telemetry system is presented for enabling wireless communications between an implantable medical device and an external device in a manner which reduces the power requirements of the implantable device by duty cycling its wireless communication circuitry. A wakeup scheme for the implantable device is provided in which the external device transmits a data segment containing a repeating sequence of special wakeup characters in order to establish a communications session with the implantable device. The wakeup scheme may be designed to operate in the context of a handshaking protocol for collision avoidance.
摘要:
A system and method for in situ trimming of oscillators in a pair of implantable medical devices is provided. Each frequency over a range of oscillator trim frequencies for an initiating implantable medical device is selected and a plurality of commands are sent via an acoustic transducer in situ over the frequency selected. Each frequency over a range of oscillator trim frequencies for a responding implantable medical device is selected and a response to each of the commands received is sent via an acoustic transducer in situ over the frequency selected. The responses received by the initiating implantable medical device are evaluated and a combination of the oscillator trim frequencies for both implantable medical devices that together exhibit a strongest acoustic wave is identified. Oscillators in both implantable medical devices are trimmed to the oscillator trim frequencies in the combination identified.
摘要:
A concrete batch plant is disclosed including a frame and a transit mixer drum having an open end and a closed end. The drum is configured to be utilized both with the concrete batch plant and on a transit mixer truck. The drum may be pivotally coupled to the frame of the concrete batch plant for movement between a first position in which the open end is positioned to receive cement from a cement supply and to receive aggregate from an aggregate supply and a second position in which the open end is positioned to discharge the mixed cement and aggregate. Further, the drum may be a polymeric drum including an interior surface formed by a plurality of complementary molded helical polymeric sections joined along a helical seam.
摘要:
This document discusses, among other things, a communication circuit for an IMD comprising a radio frequency (RF) modulator to modulate and demodulate IMD data signals, first and second serial buffer registers to store received demodulated data and to store transmit data for modulation and configured to operate according to a first clock signal, and a parallel buffer register to receive data in parallel from the first and second serial buffer registers and configured to operate according to a second clock signal that is slower than the first clock signal. The communication circuit also includes a telemetry control circuit configured to, when in the receive mode, alternate between serially receiving data into the first serial buffer register while the parallel buffer receives data from the second serial buffer register, and serially receiving data into the second serial buffer register while the parallel buffer receives data from the first serial buffer.
摘要:
A telemetry system is presented for enabling radio-frequency (RF) communications between an implantable medical device and an external device in a manner which reduces the power requirements of the implantable device by duty cycling its RF circuitry. A wakeup scheme for the implantable device is provided in which the external device transmits a data segment containing a repeating sequence of special wakeup characters in order to establish a communications session with the implantable device. The wakeup scheme may be designed to operate in the context of a handshaking protocol for collision avoidance.
摘要:
An implantable medical device includes a radio-frequency (RF) telemetry circuit and a power connection module through which the RF telemetry circuit is connected to an energy source such as a battery. The power connection module connects power from the energy source to at least one portion of the RF telemetry circuit when a user initiates an RF telemetry session. After the RF telemetry session is completed, the power connection module shuts off the at least one portion of the RF telemetry circuit. Power-on examples include a wireless telemetry activation signal received by a low power radio receiver in the implantable device, a physical motion detected by an activity sensor in the implantable device, an activation of an inductive telemetry circuit in the implantable device, a magnetic field detected by a magnetic field detector in the implantable device, and/or a telemetry activation signal detected by a sensing circuit included in the implantable device. Power-off examples include a wireless termination signal received by the implantable device, a delay timeout following the RF telemetry session, and/or a signal received by an inductive telemetry circuit in the implantable device.
摘要:
A liquid phase process for the preparation of an (meth)-acrylate, such as methyl methacrylate, in the presence of water and a bi-functional, heterogeneous catalyst which contains both acidic and noble metal functional groups. The preferred (meth)-acrylate is methyl methacrylate (MMA). A surprising amount of MMA is produced, in spite of a competitive side reaction which produces methyl tertiary butyl ether (MTBE).
摘要:
An improved friction heater apparatus (10) comprises a thin walled metallic drum (25) sealed on both ends, having a centrally disposed axle (14) mounted therein, and a plurality of free floating friction elements (16) operatively associated with the axle (14), wherein the rotary motion of the axle will impart centrifugal force to the friction elements to radially displace the friction elements with respect to the axle, and into engagement with the wall of the metallic drum (25).