Blood Pressure Transducer Research Articles

Catheter Tip Blood Pressure Transducer

Catheter Tip Blood Pressure Transducer

Blood Pressure Transducer

Blood Pressure Transducer

Sweep-Frequency Marker Generator For Blood Pressure Transducer Testing

A circuit which places accurate frequency calibrations on swept-frequency recordings is presented. This circuit is useful in the calibration of direct blood pressure transducers and will have applications in the testing of other biological transducers as well. The design range of 1 Hz to 128 square root 2 Hz is suitable for testing a broad range of biological transducers and systems. The circuit basically measures the periods between successive zero crossings. Pulses are generated that may be recorded on a swept-frequency strip chart record of an individual transducer. A series of sixteen marker pulses indicates 1 Hz, square root 2 Hz, 2 Hz, 2 square root 2 Hz, up to 128 square root 2 Hz. A special wide pulse at 16 Hz distinguishes the marker pulses.

Crystal-controlled telemetry system for long-term acquisition of physiological data.

A crystal-controlled telemetry system was developed for long-term high-reliability recording of blood pressure in unrestrained animals. The miniaturized transducer-transmitter system is powered by two lithium batteries that allow for more than 200 h of continuous recording of blood pressure before battery replacement. The total system has a flat frequency response of 0-25 Hz and a time stability of +/- 1 mmHg/day. Linearity is better than 0.5%. The high degree of dependability of the system permits us to perform continuous, unattended, around-the-clock recordings of pressure and heart rate in unrestrained animals. Very high dependability is achieved by the use of a novel piezoresistive blood pressure transducer and by the inherent stability of the crystal-controlled radio-frequency oscillator of the transmitter. The receiver is also crystal tuned to the measured transmitter frequency. This transmitter-receiver frequency locking ensures very reliable reception of the telemetered signal.

Evaluation of blood-pressure transducers.

Evaluation of blood-pressure transducers.

Blood pressure transducers and infusion pumps assessed

The two most recent Health Equipment Information Bulletins (see DTB May 28, p.43) deal with Blood Pressure Transducers (July 1982) and Infusion (syringe) Pumps (October 1982). They are available free from Regional or District Administrators for all NHS staff; others can obtain them for £3 per copy from DHSS (leaflets), PO Box 21, Stanmore, Middlesex HA7 1AT.

A disposable blood pressure transducer system.

A unique disposable invasive hemodynamic blood pressure transducer system has been developed. The system consists of a disposable piezoresistive flow-through transducer with twelve-inch pigtail, a reusable extension cable, an electronic interface module and a custom interconnect cable to attach to most monitors. The transducer has Linden Luer fittings and replaces the dome and reusable transducer in monitoring systems. The cost of the transducer is kept low so that it can be disposable through efficient modern, high-volume semiconductor technology and the fact that additional electrical isolation is accomplished in the interface module. Besides providing electrical isolation, the interface module provides a universal output which will accommodate all common AC, DC, and pulsed excitation signals from monitors.

A model for determining the cost per use of multiple-use blood pressure transducers.

A model for determining the cost per use of multiple-use blood pressure transducers.

The Technical Evaluation of Blood Pressure Transducers

The Technical Evaluation of Blood Pressure Transducers

Measurement of neuromuscular blockade in man. A simple modification of a clinical pressure transducer.

A simple modification of a clinical blood pressure transducer is described, which permits it to be used for the quantitative estimation of neuromuscular blockade in man. The instrument remains available for other pressure measurements since only the plastic dome is modified.

Orbital cortical influences on cardiovascular dynamics and myocardial structure in conscious monkeys

The posterior orbital cortex of the frontal lobes in conscious monkeys was stimulated electrically to study the influence of this structure on cardiovascular hemodynamics and cardiac morphology. Stimulating electrodes, cardiac output flow probes, and arterial blood pressure transducers were chronically implanted by aseptic procedures into eight Macaca fascicularis monkeys. Cardiovascular changes induced by stimulating the orbital cortex included both biphasic and unidirectional alterations in cardiac output, blood pressure, heart rate, stroke volume, and total systemic resistance. Electrode position and the rate (Hz) of applied stimulation were the primary determinants of the direction and magnitude of the response. All animals stimulated demonstrated acute, discrete interventricular septal myocytolysis, characteristic of early ischemic lesions. Since the orbital cortex is a part of the limbic system, changes induced by its stimulation suggest a pathophysiological mechanism whereby emotional expression may effect dynamic shifts in cardiovascular functions and may thus induce permanent and manifest myocardial lesions.

An analogue preprocessor for the analysis of blood pressure.

A description is given of an analogue preprocessor designed to supply outputs corresponding to the systolic, diastolic, pulse and mean pressures of an arterial blood-pressure waveform obtained from a blood-pressure transducer. These can be fed, under program control, to an associated digital computer system. An indication of any pulse deficit present is also provided.

A microminiature solid-state capacitive blood pressure transducer with improved sensitivity.

A microminiature pressure transducer is described utilizing a variable air capacitor driven by a pressure-sensitive deflectible silicon membrane as the detection mechanism. Silicon integrated circuit technology is used throughout for economical batch fabrication of the device. Prototype devices have been fabricated and initial test results under static pressure conditions are reported. Equivalent gauge factors of over 500 for this variable capacitance device are about a factor of 5-10 better than the best theoretically designed silicon strain gauges in the size range necessary for catheter insertion. Temperature independence and increased linearity are also important advantages of this variable capacitance sensor head.

A NEW HEMODIALYSIS CONSOLE

Abstract A description is given of some constituent parts in a new single‐patient hemodialysis console. The parts, which were all developed especially for use in hemodialysis, are: proportionating pump, inductive conductivity meter, heating and deaerating system, blood leak detector, pressure regulator, micro‐infusion pump, disposable blood pressure transducer and disposable blood flow meter.

A NEW HEMODIALYSIS CONSOLE

Abstract A general description of a new single‐patient hemodialysis console is given. The present model, which is designed for centre dialysis, is constructed to ensure a high degree of safety in the dialysis procedure and several consoles can be combined to form an integrated warning system, which should allow a reduction in staff. Serious events in the procedure cause automatic interruption of dialysis. The console can be sterilized by heat and by chemicals. Leakage of blood into the blood pressure gauge is prevented by the use of disposable hermetic blood pressure transducers. Individual functions of the console are manufactured as separate modules, which can easily be replaced, facilitating a speedy repair.

Automated calibration of blood pressure signal conditioners.

A system for automatic calibration of blood pressure transducers is described. Automatic calibration is accomplished by activation of an analog-controlled servo system that sets the zero balance and gain in a single sequence. An unlimited number of transducers may be calibrated simultaneously, and calibration is completed within a period of less than 1 min. Accuracy and repeatability are assured without dependence on the operator's judgment.

Blood-Pressure Transducer

A piezoelectric blood-pressure transducer has been developed for indirect blood-pressure measurements on a wrist for the clinical environment. Use of a piezoelectric ceramic beam with a relatively high impedance amplifier provides a position-insensitive pressure measurement, which is very much desirable for a long-term measurement.

Heart rate and its neural regulation with rising body temperature in anesthetized rats.

ARTICLESHeart rate and its neural regulation with rising body temperature in anesthetized ratsRR WalshRR WalshPublished Online:01 Oct 1969https://doi.org/10.1152/ajplegacy.1969.217.4.1139MoreSectionsPDF (2 MB)Download PDF ToolsExport citationAdd to favoritesGet permissionsTrack citations ShareShare onFacebookTwitterLinkedInWeChat Previous Back to Top Next Download PDF FiguresReferencesRelatedInformation Cited ByBiphasic changes in spontaneous cardiovagal baroreflex sensitivity during passive hyperthermia22 February 2019 | Scientific Reports, Vol. 9, No. 1Successful implantation of an abdominal aortic blood pressure transducer and radio-telemetry transmitter in guinea pigs — Anaesthesia, analgesic management and surgical methods, and their influence on hemodynamic parameters and body temperatureJournal of Pharmacological and Toxicological Methods, Vol. 80Measuring heart rate variability in horses to investigate the autonomic nervous system activity – Pros and cons of different methodsApplied Animal Behaviour Science, Vol. 166Core temperature variation is associated with heart rate variability independent of cardiac index: A study of 278 trauma patientsJournal of Critical Care, Vol. 26, No. 5Adaptations of the Autonomous Nervous System Controlling Heart Rate Are Impaired by a Mutant Thyroid Hormone Receptor-α112 March 2010 | Endocrinology, Vol. 151, No. 5Evidence of dominant parasympathetic nervous activity of great cormorants (Phalacrocorax carbo)6 February 2009 | Journal of Comparative Physiology A, Vol. 195, No. 4Effects of Cacao Liquor Polyphenols on Cardiovascular and Autonomic Nervous Functions in Hypercholesterolaemic RabbitsBasic & Clinical Pharmacology & Toxicology, Vol. 103, No. 6Whole-body heating slows carotid baroreflex response in human subjects20 May 2005 | European Journal of Applied Physiology, Vol. 94, No. 5-6Effects of acute normovolemic haemodilution on cardiorespiratory changes in hyperthermia and its physical treatment9 July 2009 | International Journal of Hyperthermia, Vol. 20, No. 8Heart rate variability and electrocardiogram waveform as predictors of morbidity during hypothermia and rewarming in ratsCanadian Journal of Physiology and Pharmacology, Vol. 80, No. 9Vascular reactivity and baroreflex function during hyperthermia in conscious ratsMichael P. Massett, Stephen J. Lewis, Harald M. Stauss, and Kevin C. Kregel1 October 2000 | American Journal of Physiology-Regulatory, Integrative and Comparative Physiology, Vol. 279, No. 4Modulation of arterial baroreflex control of heart rate by skin cooling and heating in humansFumio Yamazaki, and Ryoko Sone1 February 2000 | Journal of Applied Physiology, Vol. 88, No. 2Assessment of autonomic nervous function by power spectral analysis of heart rate variability in the horseJournal of the Autonomic Nervous System, Vol. 60, No. 1-2Central and peripheral contributions to control of heart rate during heat acclimationPfl�gers Archiv European Journal of Physiology, Vol. 422, No. 4MECHANISM OF HEAT ACCLIMATION INDUCED BRADYCARDIA IN THE SAND RATJournal of Basic and Clinical Physiology and Pharmacology, Vol. 4, No. 1-2Heart rate and blood pressure changes during radiofrequency irradiation and environmental heatingComparative Biochemistry and Physiology Part A: Physiology, Vol. 101, No. 1R�activit� �motionelle et �quilibre neurov�g�tatif chez le ratPsychopharmacology, Vol. 61, No. 2Analysis of cardiac chronotropic responses to some autonomic blocking agents in conscious trained dogsEuropean Journal of Pharmacology, Vol. 39, No. 2Varying changes in heart rate produced by nociceptive stimulation of the skin in rats at different temperaturesBrain Research, Vol. 110, No. 2Effects of reserpine on nervous control of heart-rate in chickens (gallus domesticus)Comparative and General Pharmacology, Vol. 1, No. 3 More from this issue > Volume 217Issue 4October 1969Pages 1139-1143 Copyright & PermissionsCopyright © 1969 by American Physiological Societyhttps://doi.org/10.1152/ajplegacy.1969.217.4.1139PubMed4390467History Published online 1 October 1969 Published in print 1 October 1969 Metrics

Square-wave liquid pressure generator for testing blood pressure transducers.

ArticleSquare-wave liquid pressure generator for testing blood pressure transducers.J E Levasseur, F C Funk, and J L Patterson JrJ E Levasseur, F C Funk, and J L Patterson JrPublished Online:01 Sep 1969https://doi.org/10.1152/jappl.1969.27.3.426MoreSectionsPDF (1 MB)Download PDF ToolsExport citationAdd to favoritesGet permissionsTrack citations ShareShare onFacebookTwitterLinkedInWeChat Previous Back to Top Next Download PDF FiguresReferencesRelatedInformationCited ByFrequency response evaluation of radial artery catheter-manometer systems: Sinusoidal frequency analysis versus flush methodJournal of Clinical Monitoring, Vol. 4, No. 3Pressure Measurement in Experimental PhysiologyArteriensystem More from this issue > Volume 27Issue 3September 1969Pages 426-30 https://doi.org/10.1152/jappl.1969.27.3.426PubMed5804145History Published online 1 September 1969 Published in print 1 September 1969 Metrics

Inexpensive blood pressure transducer

Inexpensive blood pressure transducer