Chen-Li Cheng

Bio: Chen-Li Cheng is an academic researcher. The author has contributed to research in topics: Transmission system & Signal. The author has an hindex of 1, co-authored 1 publications receiving 70 citations.

An implantable bi-directional wireless transmission system for transcutaneous biological signal recording.

Abstract: This study presents an implantable microcontroller-based bi-directional transmission system with an inductive link designed for biological signal sensing. The system comprises an external module and an implantable module. The external module incorporates a high-efficiency class-E transceiver with amplitude modulation scheme and a data recovery reader. The transceiver sends both power and commands to the implanted module, while the reader recovers the recorded biological signal data and transmits the data to a personal computer (PC) for further data processing. To reduce the effects of interference induced by the 2 MHz carrier signal, the implanted module uses two separate coils to perform the necessary two-way data transmission. The outward backward telemetry circuitry of the implanted module was based on the load-shift keying (LSK) technique. The transmitted sensed signal had a 10-bit resolution and a read-out rate of 115 kbps. The implanted module, measuring 4.5 ? 3 ? 1.2 cm3, was successfully verified in animal experiment in which the electroneurogram (ENG) signal was recorded from the sciatic nerve of New Zealand rabbits in response to nociceptive stimulation of foot. The reliable operating distance of the system was within about 3.5 cm with an efficiency of around 25%. Our present study confirms that the proposed biological signal sensing device is suitable for various implanted applications following an appropriate biocompatible packaging procedure.

An Implantable Wireless Neural Interface System for Simultaneous Recording and Stimulation of Peripheral Nerve with a Single Cuff Electrode.

Abstract: Recently, implantable devices have become widely used in neural prostheses because they eliminate endemic drawbacks of conventional percutaneous neural interface systems. However, there are still several issues to be considered: low-efficiency wireless power transmission; wireless data communication over restricted operating distance with high power consumption; and limited functionality, working either as a neural signal recorder or as a stimulator. To overcome these issues, we suggest a novel implantable wireless neural interface system for simultaneous neural signal recording and stimulation using a single cuff electrode. By using widely available commercial off-the-shelf (COTS) components, an easily reconfigurable implantable wireless neural interface system was implemented into one compact module. The implantable device includes a wireless power consortium (WPC)-compliant power transmission circuit, a medical implant communication service (MICS)-band-based radio link and a cuff-electrode path controller for simultaneous neural signal recording and stimulation. During in vivo experiments with rabbit models, the implantable device successfully recorded and stimulated the tibial and peroneal nerves while communicating with the external device. The proposed system can be modified for various implantable medical devices, especially such as closed-loop control based implantable neural prostheses requiring neural signal recording and stimulation at the same time.

Portable power supply device for mobile computing devices

Abstract: A portable power supply device for a mobile computing device is provided. The portable power supply device comprises a retention structure to retain the mobile computing device, a power source, and an inductive signal interface. The inductive signal interface is used to inductively signal power from the power source to a corresponding inductive signal interface of the mobile computing device.

Orientation and presence detection for use in configuring operations of computing devices in docked environments

Abstract: A mobile computing device (‘MCD’) and docking station (‘dock’) are individually equipped with features and components that enable charging/power signals to be communicated from the dock to the MCD without use of connectors. Other embodiments provide for the MCD or the dock to identify an orientation of the MCD as retained on the docking station. As an addition or alternative, magnetic coupling may be used to maintain and/or orient the two devices in a mated position.

Magnetic latching mechanism for use in mating a mobile computing device to an accessory device

Abstract: A mobile computing device and an accessory device are individually equipped with features and components that enable magnetic coupling of the two devices. Specific embodiments provide for the use of one or more horseshoe magnets for use in the magnetic coupling mechanisms. As an addition or alternative, electromagnetic coupling may be used to selectively maintain and/or orient the two devices in a mated position.

Extending device functionality amongst inductively linked devices

Abstract: A docking station is provided for a computing device. The docking station may be used by, for example, a mobile computing device, such as a cellular or wireless telephony/messaging device. The docking station includes a housing comprising a receiving surface top receive and retain the mobile computing device. An inductive signal transfer interface is included with the housing to inductively signal at least one of power or data to the mobile computing device. The docking station further provides an output component and processing resources. The processing resources are configured to detect placement of the mobile computing device on the receiving surface. The data is received from the mobile computing device, and an output is signaled to the output component based on the received data.