Biomaterial Database

Telemetric monitoring device to detect thrombosis in the external arteriovenous shunt. 1975

H Hidai, and M Kusakabe, and S Abe

A telemetric monitoring system of the external arteriovenous shunt for long term hemodialysis was deviced. Analysis of the arteriovenous shunt bruit showed that frequency distribution of the bruit ranged between 25 and 500 Hz. An air transmission type microphone with an optimum frequency at 200 Hz was designed. The monitoring system, including the microphone, a small FM transmitter and an FM receiver with an alarm system by the transmitter. The signals received by the FM receiver were amplified and selected by a bandpass filter. After being all-wave rectified, and averaged for one min by the averaging circuit, the signals were finally balanced by the standard signal and the precision comparator. When the arteiovenous shunt bruit ceased for more than one min, the alarm system went off. The system frequently detected obstruction of blood flow due to flection of the forearm during sleep and by other causes, thereby preventing clotting of the arteriovenous shunt flow. Thrombosis in the arteriovenous shunt was detected 5 times by the telemetric device while the patients were alseep at home, and declotting was successful in all the cases. The system has proven to be available for early detection of shunt obstruction and of clot formation inside the arteriovenous shunt.

UI	MeSH Term	Description	Entries
D012039	Regional Blood Flow	The flow of BLOOD through or around an organ or region of the body.	Blood Flow, Regional,Blood Flows, Regional,Flow, Regional Blood,Flows, Regional Blood,Regional Blood Flows
D004285	Dogs	The domestic dog, Canis familiaris, comprising about 400 breeds, of the carnivore family CANIDAE. They are worldwide in distribution and live in association with people. (Walker's Mammals of the World, 5th ed, p1065)	Canis familiaris,Dog
D004582	Electronics, Medical	The research and development of ELECTRICAL EQUIPMENT AND SUPPLIES for such medical applications as diagnosis, therapy, research, anesthesia control, cardiac control, and surgery. (From McGraw-Hill Dictionary of Scientific and Technical Terms, 6th ed)	Medical Electronics
D005542	Forearm	Part of the upper extremity in humans and primates extending from the ELBOW to the WRIST.	Antebrachium,Antebrachiums,Forearms
D006435	Renal Dialysis	Therapy for the insufficient cleansing of the BLOOD by the kidneys based on dialysis and including hemodialysis, PERITONEAL DIALYSIS, and HEMODIAFILTRATION.	Dialysis, Extracorporeal,Dialysis, Renal,Extracorporeal Dialysis,Hemodialysis,Dialyses, Extracorporeal,Dialyses, Renal,Extracorporeal Dialyses,Hemodialyses,Renal Dialyses
D006801	Humans	Members of the species Homo sapiens.	Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D000818	Animals	Unicellular or multicellular, heterotrophic organisms, that have sensation and the power of voluntary movement. Under the older five kingdom paradigm, Animalia was one of the kingdoms. Under the modern three domain model, Animalia represents one of the many groups in the domain EUKARYOTA.	Animal,Metazoa,Animalia
D001166	Arteriovenous Shunt, Surgical	Surgical shunt allowing direct passage of blood from an artery to a vein. (From Dorland, 28th ed)	Shunt, Surgical Arteriovenous,Surgical Arteriovenous Shunt,Arteriovenous Shunts, Surgical,Shunts, Surgical Arteriovenous,Surgical Arteriovenous Shunts
D012212	Rheology	The study of the deformation and flow of matter, usually liquids or fluids, and of the plastic flow of solids. The concept covers consistency, dilatancy, liquefaction, resistance to flow, shearing, thixotrophy, and VISCOSITY.	Flowmetry,Velocimetry,Velocimetries
D013686	Telemetry	Transmission of the readings of instruments to a remote location by means of wires, radio waves, or other means. (McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed)	Telemetries