Chung Kwong Yeung

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Computer-based simulators offer users the opportunity to learn and practice surgical skills through repeated exercises within safe and realistic learning environments. This paper reports the development of a da Vinci Surgical System simulator, including the creation of a geometrical and kinematic model of the da Vinci system. The SensAble Phantom 3D(More)
For the operation planning of robotically assisted laparoscopic surgery, the most critical issues are the trocar port placement in the patient's body (incision entry port for intervention) and the pose selection of the robot (docking of the robot). These significantly affect the robot's dexterity, manipulability, reachability, and visibility, which are(More)
The nature of the action of the vesicoureteric junction (VUJ) in humans is still controversial. We were interested in the reasons why the jet consists of several peaks. We hypothesised that the modification of the jet into a variable number of peaks is the result of an active sphincter mechanism at the VUJ. A total of 1,010 subjects of all ages and both(More)
Eleven survivors of pelvic rhabdomyosarcoma underwent bladder function studies and upper urinary tract evaluation at a mean of 6.6 years after completion of therapy, which included a conservative, bladder-sparing surgical policy. Primary tumour sites were: bladder base/prostate, 6; bladder dome, 1; vagina, 2; and pelvic side wall, 2. Seven children (five(More)
Roles of c-aminobutyric acid (GABA) antagonists on the chick model of form-deprivation myopia (FDM) were investigated. Bicuculline (GABA A) or TPMPA (GABA A0r) was injected intravitreally (1 or 10 mg=mL) into the right eyes of chicks with or without 10 FDM for 13 days. The contralateral eyes served as the control. The eye weight (EW), equatorial diameter(More)
PURPOSE Our previous results revealed a positive correlation between bladder dysfunction and cortical arousals in children with enuresis. This finding implied an interrelationship between bladder dysfunction and brainstem dysfunction. Thus, we used an animal model to characterize brainstem functional changes in response to altered bladder function. (More)
Acute cerebellar ataxia and opsomyoclonus are presenting signs of occult neuroblastoma for a substantial proportion of paediatric patients. Cerebellar ataxia may be due to antibodies against the neuroblastoma cross-reacting with cerebellar tissue. This report is of a 26-month-old boy who presented with encephalitis-like features of ataxia, seizures,(More)
Due to the neurotoxicity effects of general anesthesia (GA) and sedatives found in animal studies, there is a general recommendation to avoid nonurgent surgical procedures requiring anesthesia in children younger than 3 years of age. The aim of this study was to determine the incidence of anesthesia-related postoperative cognitive dysfunction (POCD) on the(More)
We report an 82-year-old lady who developed sudden onset nodular and erythematous lesions and neutrophilia following an episode of urinary tract infection. Skin biopsy confirmed the diagnosis of Sweet syndrome. Response to the use of prednisolone alone was not satisfactory. The skin lesions however showed a sustained response to the regular use of(More)