Accession Number : ADB156216

Title :   In-Line Microwave Warmer for Blood and Intravenous Fluids.

Descriptive Note : Final rept. 1 Dec 88-14 Jan 91,

Corporate Author : MICROWAVE MEDICAL SYSTEMS INC LITTLETON MA

Personal Author(s) : Grabowy, Richard S.

Report Date : 14 JAN 1991

Pagination or Media Count : 77

Abstract : Microwave technology has been used to develop a system capable of providing fast, in line warming of blood or intravenous (IV) fluids. Key advantages of this system over conventional heat exchangers are the elimination of a water bath, short path length (disposable cartridge consists of a mere 18 inch length if IV tubing) and instantaneous fluid heating (no warmup time). An engineering model has been successfully built and tested. It consists of four main components: (1) Microwave Energy Source, continuously variable; (2) Heating Chamber with Disposable Cartridge; (3) Microwave Radiometer for temperature measurement; and (4) Microcomputer Feedback Control. The single most important technical achievement has been the integration of these major components into a functional closed-loop feedback control system. To determine the efficacy of the rapid, in line warming of blood and IV fluids by this system, in-vivo tests using baboons were conducted using a technique of radio labelling blood components prior to microwave warming. Results show no significant changes in blood component longevity between samples that were warmed with microwave energy versus control samples. In addition in-vitro tests using blood-bank blood were performed and again biochemistry and hematologic analysis showed no significant changes in blood components of microwave warmed blood versus control samples.

Descriptors :   , ADDITION, BABOONS, BATHS, BIOCHEMISTRY, BLOOD, CARTRIDGES, CHAMBERS, CONTROL, DISPOSABLE EQUIPMENT, ENERGY, ENGINEERING, FEEDBACK, FLUIDS, HEAT EXCHANGERS, HEATING, HEMATOLOGY, IN VITRO ANALYSIS, IN VIVO ANALYSIS, MEASUREMENT, MICROCOMPUTERS, MICROWAVE EQUIPMENT, MICROWAVES, MODELS, PATHS, RADIOMETERS, SAMPLING, SOURCES, TEMPERATURE, TEST AND EVALUATION, TIME, VEINS, WATER.

Subject Categories : Medicine and Medical Research
      Radiofrequency Wave Propagation

Distribution Statement : APPROVED FOR PUBLIC RELEASE