Browsing by Author "Choi Charles Tak Ming"

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Method and apparatus for controlling electrical stimulation
(2012-12-25)
Choi Charles Tak Ming
;
Hsu Chien Hua
An apparatus and method for controlling an electrical stimulation system to increase the resolution of the stimulation region with multiple independent power source electrodes is proposed. In the apparatus, the electrode set contains at least three electrodes of which two adjacent electrodes are of the same power polarity to control the location of the composite stimulation signal and the others are of an inverse power polarity to balance the total power polarity and narrow the stimulation region. The method for the apparatus comprises steps of: receiving a target stimulation location and level, generating at least one parameter to adjust power settings of the electrodes, thereby obtaining a composite stimulation signal corresponding to a virtual channel of which a location and level match the target stimulation location and level.
METHOD FOR ANALYZING NERVE FIBER DISTRIBUTION AND MEASURING NORMALIZED EVOKED COMPOUND ACTION ELECTRIC POTENTIAL
(2014-03-06)
Choi Charles Tak Ming
A method for analyzing nerve fibers distribution is provided, including inputting a stimulation signal into a nerve tissue through at least two sensing and conducting electrodes, applying a stimulation signal ratio to control the stimulation signal using an electric current steering technique to electrically stimulate a plurality of nerve fibers within a plurality of stimulations areas of the nerve tissue; receiving a plurality of evoked compound action potentials (ECAP) using at least two sensing and conducting electrodes due to the nerve fibers electrically stimulated and computing a distance between the nerve fiber and the conducting electrodes including eliminating non-ideal effect caused by an electric potential attenuation factor, wherein the electric potential attenuation factor is a function of the distance between each of the conducting electrodes and the nerve tissue; and integrating and comparing the received ECAPs and analyzing the nerve fibers distribution of the nerve tissue.
METHOD FOR IDENTIFYING STIMULATION TARGET
(2013-04-04)
Choi Charles Tak Ming
;
Sun Shu-Hai
;
Lee Yi-Hsuan
A method for identifying a stimulation target is provided, which uses microelectrode recording and electrical impedance tomography techniques together in a composite probe. The composite probe includes at least a microelectrode recording sensor and a plurality of microelectrodes, so that after the composite probe is guided and implanted to a depth suitable for the stimulation target based on microelectrode recording signals, tissue structures surrounding the composite probe are delineated by using the plurality of microelectrodes, and the boundary of the stimulation target and the precise location of the composite probe within the stimulation target are determined. Accordingly, the present invention provides a quick and accurate direction for surgeons, eliminating the problem of not knowing the exact location of the implanted probe within the stimulation target as in the case during deep brain stimulation surgeries.
METHOD FOR IMPROVING IMAGING RESOLUTION OF ELECTRICAL IMPEDANCE TOMOGRAPHY
(2013-07-04)
Choi Charles Tak Ming
;
Sun Shu-Hai
The present disclosure provides a method for improving imaging resolution of electrical impedance tomography (EIT). More specifically, the present disclosure forms virtual electrode(s) using an electric current steering technique, which is used to improve imaging resolution of an EIT system without physically increasing a number of conducting electrodes. The EIT system of the present disclosure may includes a plurality of conducting electrodes, at least one signal generator, at least one signal receiver and at least one electric current steering device. In other words, the present disclosure applies both the electric current steering technique and the virtual electrode technique to EIT. Consequently, imaging resolution of EIT can be improved without physically increasing the number of conducting electrodes.
Parameter adjustment device and method thereof
(2014-03-04)
Choi Charles Tak Ming
;
Lee Yi-Hsuan
A parameter adjustment device and method thereof for a stimulator is disclosed. The parameter adjustment device comprises a generation unit, a user interface and a process unit. The generation unit generates a test MAP based on a current MAP. The user interface displays the current MAP and the test MAP for choosing one of them as the preferred MAP, and displays a major and a minor for choosing again, the major and the minor is defined as a significant difference and a little difference between the test MAP and the current MAP respectively. The process unit computes the acceptance probability of the preferred MAP based on a major or minor probability correspondence relationship and determines a next MAP by comparing the acceptance probability with the test probability. When one of the termination conditions is satisfied in an iterative operation, the next MAP is outputted as the best MAP.
SYSTEMS AND METHODS OF CONSTRUCTING A PATIENT SPECIFIC NEURAL ELECTRICAL STIMULATION MODEL
(2012-05-10)
Choi Charles Tak Ming
;
Lee Yi-Hsuan
A system and a method of constructing a personalized or patient specific neural stimulation model. The method includes measuring an electro-physiology signal of an individual and establishing a personalized or patient specific neural stimulation model that has a preset model parameter and generates a human physiology parameter according to the model parameters; and analyzing the human physiology parameters and regulating the model parameters according to a parameter-optimizing algorithm, such that the human physiology parameters outputted by the personalized or patient specific neural stimulation model matches the measured electro-physiology signal.