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Biomedical Engineering, IEEE Transactions on

Issue 3 • Date May 1971

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Displaying Results 1 - 18 of 18
  • Table of contents

    Publication Year: 1971 , Page(s): c1
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  • IEEE Engineering in Medicine and Biology Group

    Publication Year: 1971 , Page(s): c2
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  • Study of the Action of Static and Dynamic Fusimotor Fibers With a Mechanical Model of the Mammalian Muscle Spindle

    Publication Year: 1971 , Page(s): 175 - 180
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2119 KB)  

    A model of the mammalian muscle spindle having three distinct parts is proposed. The three parts, which consist of a mechanical filter, a transducer, and an encoder, are closely related with their physiological counterparts. A study of the generator potentials for the primary and secondary endings of the spindle was performed by means of an analog computer simulation of the model. The afferent responses of the spindle under a phasic stretch with and without fusimotor fibers simulation are also studied. Finally, frequencygrams (see text) are obtained under the condition of ¿1 (dynamic) stimulation acting on both nuclear bag and nuclear chain fibers. The model yields results that are directly comparable with physiological data obtained under similar conditions. View full abstract»

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  • Optimal Permeability Character for Quasi-Static Countercurrent Dialysis

    Publication Year: 1971 , Page(s): 181 - 186
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    An important parameter in the design of countercurrent dialyzers is the permeability of the membrane which separates the blood and dialyzate. In this paper, methods of optimization theory are applied to specify membrane permeability along the length of a countercurrent dialyzer operating under quasi-static conditions. Two optimization problems are considered. In the first the performance functional is a quadratic measure of membrane complexity; in the second it includes also a quadratic measure of the deviation of the blood output concentration from a desired (low) level. For both situations it is shown that the optimal membrane is one of constant permeability along its length, a result which is intuitively appealing and has an obvious economic consequence. Formulas for computing the optimal permeabilities are given, and some problems for future research in this area are outlined. A generalization of the principal result is also included, and some deficiencies in the present analysis are discussed. View full abstract»

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  • Pupillary Light Reflex: Development of Teaching Models

    Publication Year: 1971 , Page(s): 187 - 194
    Cited by:  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2713 KB)  

    During the past 15 years, many models have been developed for the pupillary light reflex system. Some of these models have been inadequately described while others have never been tested to determine their compliance or noncompliance with known experimental data. This paper reviews the major experimental and modeling advances that assisted in understanding the basic operation of the pupillary light reflex system. View full abstract»

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  • A Small Analog Computer for Continuous Measurement of Intracellular Ion Activities

    Publication Year: 1971 , Page(s): 195 - 200
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    The operation of liquid ion exchanger microelectrodes that allows measurement of internal potassium and chloride activities in identifiable neurons has been described. A computer that solves the logarithmic equation necessary for computation of these activities has been constructed and tested successfully. The great value of the computer is that it permits continuous measurement of these activities. When the internal ion activities change, such continuous measurement allows calculation of potassium and chloride permeabilities in single neurons. View full abstract»

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  • A Programmable Parallel Timing System

    Publication Year: 1971 , Page(s): 201 - 205
    Cited by:  Patents (2)
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    Timers used for the generation of long sequences of pulses have employed serial counting techniques. A system of parallel counting chains, each capable of independent operation in a variety of modes and having programmable clock signals, can be used to generate long sequences of pulses and act as event counters or timedelay devices. View full abstract»

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  • Electrocardiogram Recording with Pasteless Electrodes

    Publication Year: 1971 , Page(s): 206 - 211
    Cited by:  Papers (17)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2281 KB)  

    Experimentation regarding various aspects of a technique for recording electrocardiographic potentials from unprepared skin, without the use of conventional paste, is described. Because of the relatively high skin-to-electrode impedances encountered without electrolytic paste, high input impedance amplifiers must be utilized for acquisition of the signal. In order to minimize susceptibility to external electrostatic and electromagnetic interference, an inherent problem with high input impedance amplifiers, buffer amplifiers were incorporated directly within the electrode housing. Of the different metals tested, stainless steel proved to be the most stable skin contact material for pasteless operation. The integrated electrode-buffer amplifiers described comply with specifications of the American Heart Association and should prove useful as a direct replacement for conventional paste-type electrodes in existing clinical EKG equipment as well as for long-term applications such as space missions and intensive-care-unit patient monitoring, where frequent attention to the electrodes is inconvenient. View full abstract»

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  • A QRS Preprocessor Based on Digital Differentiation

    Publication Year: 1971 , Page(s): 212 - 217
    Cited by:  Papers (22)  |  Patents (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (3052 KB)  

    Digital preprocessors can ease the increasing data collection demands placed on real-time computers in patient monitoring. This paper describes a preprocessor that detects in real time an electrocardiogram QRS complex and computes the R-R interval. Detection is performed using multiple digital differentiation, which is encouraging as an ultrareliable means for locating the QRS. Inherent in the technique is a dependable control that can automatically compensate for signal-level variations. Clinical data demonstrate that detection is insensitive to low- and high-frequency noise, from baseline drift to muscle artifact and cautery bursts. The device can be connected directly to a patient, whose safety is guaranteed by optoelectronic isolation and interelectrode current limiting. Preprocessor operation has been human-engineered to a simple on/off procedure. View full abstract»

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  • A Review on Mathematical Models of the Human Thermal System

    Publication Year: 1971 , Page(s): 218 - 234
    Cited by:  Papers (7)
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    The literature on mathematical models of the human thermal system is reviewed and classified. View full abstract»

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  • A System for Measurement of Oxygen Consumption and Control of Inspired Carbon Dioxide

    Publication Year: 1971 , Page(s): 235 - 237
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    A system that monitors oxygen consumptions and replaces oxygen as needed to a spirometer under automatic control is presented. The system permits the regulation of the inspired carbon dioxide concentration at a specified level and monitoring of the expired carbon dioxide concentration. View full abstract»

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  • Solid-State Amplitude Discriminator for Neural Units

    Publication Year: 1971 , Page(s): 237 - 240
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    A solid-state device which utilizes logic circuitry to discriminate neural signals on the basis of amplitude is described and its circuit diagram presented. The discriminator is compatible with most oscilloscope vertical amplifier voltages and will operate with a battery power supply. View full abstract»

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  • A Mechanical Microelectrode Pulsing Device to Facilitate the Penetration of Small Cells

    Publication Year: 1971 , Page(s): 240 - 241
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    An electromagnetic electrode driving device which produces a relatively pure axial motion has been developed. The motion takes place in a few milliseconds, and its amplitude can be adjusted over a range of about ¿-30 ¿m. The device has been used to penetrate cells with a diameter of about 5 ¿m. View full abstract»

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  • Conference on RF Neuromagnetics-Summary of Proceedings

    Publication Year: 1971 , Page(s): 242 - 245
    Cited by:  Papers (2)
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  • The Technology of Automated Multiphasic Health Testing

    Publication Year: 1971 , Page(s): 246 - 248
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1604 KB)  

    ``The Technology of Automated Multiphasic Health Testing (AMHT)'' was examined in Davos, Switzerland, during September 14-18, 1970, at the first international conference supported by the Engineering Foundation. The 159 conference members from 14 different nations discussed AMHT on the basis of its involvement in the use of automated laboratory equipment and medical instruments in combination with computers to provide numerous accurate and reliable tests as well as other procedures to a large number of people with a minimum of highly trained personnel. Topics covered in the plenary sessions included ``AMHT in Perspective,'' ``Recent Progress in AMHT,'' ``Utilizing AMHT in Developing Countries,'' ``The Role of the Engineer in AMHT,'' ``AMHT in Patient Surveillance and Patient Management,'' ``How to Organize and Operate an AMHT Facility,'' and ``Device Safety.'' A special session was presented on ``Clinical Chemistry.'' Evening workshops were held on ``Quantitative Neurological Evaluation,'' ``The Role of the Engineer in AMHT,'' ``Trend Detection in Cardiology,'' ``Automatic Cytology,'' and ``Blood Chemistry Measurements¿New Approaches to Automation.'' Conference proceedings will be published by the Engineering Foundation. View full abstract»

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  • Letters to the Editor

    Publication Year: 1971 , Page(s): 249 - 251
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  • IEEE Transactions on Bio-Medical Engineering Statement of Editorial Policy

    Publication Year: 1971 , Page(s): 251-a
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  • Institutional listings

    Publication Year: 1971 , Page(s): 251b
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Aims & Scope

IEEE Transactions on Biomedical Engineering contains basic and applied papers dealing with biomedical engineering. Papers range from engineering development in methods and techniques with biomedical applications to experimental and clinical investigations with engineering contributions.

Full Aims & Scope

Meet Our Editors

Editor-in-Chief
Bin He
Department of Biomedical Engineering