RESUMO
A novel artificial anal sphincter system has been developed to simulate the normal physiology of the human anorectum. With the goal of engineering a safe and reliable device, the model of human colonic blood flow has been built and the relationship between the colonic blood flow rate and the operating occlusion pressure of the anorectum is achieved. The tissue ischemia is analyzed based on constitutive relations for human anorectum. The results suggest that at the planned operating occlusion pressure of less than 4 kPa the artificial anal sphincter should not risk the vascularity of the human colon.
Assuntos
Humanos , Canal Anal , Fisiologia , Velocidade do Fluxo Sanguíneo , Fisiologia , Simulação por Computador , Desenho Assistido por Computador , Análise de Falha de Equipamento , Modelos Biológicos , Próteses e Implantes , Desenho de PróteseRESUMO
A wireless energy transmission system for the MEMS system inside alimentary tracts is reported here in the paper. It consists of an automatic frequency tracking circuit of phase lock loop and phase shift PWM control circuit. Experimental results show that the energy transmission system is capable of automatic frequency-tracking and transmission power-adjusting and has stable received energy.
Assuntos
Sistema Digestório , Fontes de Energia Elétrica , Desenho de Equipamento , Sistemas Microeletromecânicos , Telemetria , Tecnologia sem FioRESUMO
A newly-developed gastrointestinal (GI) monitoring system based on a smart capsule is presented in the paper. The unprecedented 130-200 hours battery life and smaller size (10 mm x 20 mm) allows the physician to get total pan-colonic measurements of high-amplitude propagating contractions (HAPCs). To test the in vivo performance of the monitoring system, 15 healthy volunteers and 10 patients with slow transportation constipation (STC) participate in this study. The average of HAPCs occurred in patients is significantly lower than in volunteers (12.4 +/- 3.3 vs. 18.5 +/- 3.7 p = 0.013). The system provides a useful tool for STC diagnosis and treatments of patients.
Assuntos
Adulto , Humanos , Pessoa de Meia-Idade , Colo , Fisiologia , Constipação Intestinal , Diagnóstico , Técnicas de Diagnóstico do Sistema Digestório , Desenho de Equipamento , ManometriaRESUMO
Swallowable biotelemetry systems are one kind of implantable biotelemetry systems. The research about swallowable biotelemetry systems is rapidly growing recently because they can be used to measure physiological and pathological parameters of human gastrointestinal tracts in vivo and they significantly improve patient comfort. This paper presents the current research of swallowable biotelemetry systems domestically and abroad. The development trend of these systems is analyzed at the end of the paper.
Assuntos
Humanos , Cápsulas , Eletrônica Médica , Endoscópios Gastrointestinais , Desenho de Equipamento , Trato Gastrointestinal , Fisiologia , Monitorização Fisiológica , Métodos , Telemetria , MétodosRESUMO
This paper introduces the general constitutions and principle of BCI systems. In addition, some characteristics and limitations of different research methods are discussed and compared. Finally, this paper points out the existing problems and future trends of BCIs. brain-computer interface (BCI), human-computer Interface (HCI), electroencephalography (EEG).
Assuntos
Encéfalo , Fisiologia , Computadores , Eletroencefalografia , Métodos , Processamento de Sinais Assistido por Computador , Software , Interface Usuário-ComputadorRESUMO
This paper makes a comparison between the traditional endoscope system and the active robotic endoscope system, discusses the human intestine-working conditions of the robotic endoscope system in detail and its design requirements. An active robotic endoscope system based on earthworn-locomotion principles is proposed here and besides, its structure and locomotion mechanism are analyzed. A new method of human intestinal intervention is brought out and it can prevent the robotic endoscope guided by a cone-shaped guide pipe from being jammed or damaged.
Assuntos
Humanos , Biomimética , Endoscópios Gastrointestinais , Endoscopia Gastrointestinal , Métodos , Desenho de Equipamento , Enteropatias , Diagnóstico , Miniaturização , RobóticaRESUMO
This paper presents the properties of Pneumatic artificial muscles and its application in medical robots. The linear model construction and minimum predictive error control algorithm for artificial muscles are discussed here too. This paper provides the experimental results of linear adaptive control, which show the control algorithm has certain applicable value.