 Blood pressure cuff and hose fitting therefor |
| What is claimed is: 1. An inflatable blood pressure cuff formed from a woven fabric sheet having ... |
|
| Apparatus and method for reduction in respiration artifact in pulmonary artery pressure measurement |
| OF THE INVENTION Reference is made to the block diagram of FIG. 3 wherein the signal representing ... |
|
| Adjustable blood pressure cuff and method of measuring blood pressure |
| In view of the foregoing limitations and shortcomings of the prior art devices, as well as other ... |
|
| Doppler ultrasonic diagnostic apparatus |
| Accordingly, it is an object of the present invention to eliminate the above-described problems in ... |
|
| Blood pressure and heart rate monitoring method and apparatus |
| This invention relates generally to auscultatory blood pressure and pulse monitoring method and ... |
|
| Vehicle preheater control |
| The present invention concerns a control unit for activating an auxiliary heater for heating a ... |
|
| High functional density cardiac monitoring system for captured windowed ECG data |
| The invention generally relates to wrist-worn cardiac monitors. More particularly, the invention ... |
|
| System and method for optimal sensing of cardiac events |
| OF THE PREFERRED EMBODIMENTS A preferred embodiment of the present invention is now described with ... |
|
| Anti-theft steering shaft lock |
| This invention is a new and improved anti-theft steering shaft lock including a sleeve clutch ... |
|
|
Automatic, continuous and indirect blood pressure measurement apparatus
| Details |
Inventors: Kisioka, Kazuya; Yamakoshi, Kenichi;
Assignee: Ueda Electronic Works Limited (JP)
Primary Examiner:
Assistant Examiner:
Attorney, Agent or Firm:
An apparatus which can measure the blood pressure automatically, continuously and indirectly, is provided. The apparatus is implemented basing upon the theory of volume compensation method and is provided with a cuff, an external force applying device, and pressure and volume sensors. The pressure of liquid contained in the cuff represents the instantaneous blood pressure under the servo control or feedback control of a volume plethysmogram. The apparatus has been improved by enabling an automatic measurement and by providing a DC level adjustment and first gain control circuit. The circuit is supplied with an output from the volume sensor, and the output is subjected to DC level adjustment and amplitude control. In addition to the above, the apparatus is automatically operated under control of a micro processor. |
|
DETAILED DESCRIPTION It is therefore a primary object of the present invention to provide an automatic, continuous and indirect blood pressure measurement apparatus which is fully automatically operated under the control of a micro processor.
The principle upon which the present sphygmomanometer is based, is first explained.
The principle is referred to in the art as a volume compensation method.
In this method, the blood pressure Pb and the external cuff pressure Pc are controlled to balance with one another in order to keep the blood wall in an unloaded condition (or natural state where no external pressure is applied to the blood wall).
In this condition, the external cuff pressure is used as a measure of the blood pressure.
In order to carry out the measurement of the blood pressure by means of the volume compensation method, it is most important therefore to detect the unloaded condition of the blood vessel and to maintain such an unloaded condition.
It is a well known fact that the amplitude of pulsating movement of the blood vessel wall becomes maximum when average cuff and blood pressures Pc and Pb equal to each other.
Since the amplitude of the blood vessel wall movement corresponds to the volume per unit length of the blood vessel (hereinafter referred to as a blood vessel volume), it is possible to detect the average cuff pressure Pc, which corresponds to the average blood pressure Pb, by monitoring the blood vessel volume.
It is further understood that in order to maintain the unloaded condition of the blood vessel wall, first the average cuff pressure Pc (=Pb) at the time of the maximum volume change is detected, and then a variable component .
DELTA.
Pc is superimposed upon the average cuff pressure Pc to cancel out the blood pressure.
In this unloaded condition, no external pressure is applied upon the blood vessel wall so that the blood vessel volume is held constant.
The blood vessel volume is detected by a photo sensor comprising a light emitting diode and a photo diode or transistor arranged at opposite sides of the blood vessel wall to receive light emanating from the light emitting diode
|
| Related patents |
|
|
Diagnostic evaluation, measurement, and analysis of functional activity in body organs that utilize transmembrane ion polarization and depolarization
Electro-optical effects have been demonstrated and utilized in fields other than scanning the intact, living body (cf: Kerr Effect, Raman Effect, and Pockel's Effect). A...
|
|
|
Method and apparatus for monitoring blood pressure
It is therefore an object of the present invention to provide a method and an apparatus for monitoring blood pressure of a living body, which permits a blood pressure ...
|
|
|
Blood pressure measure system
It is therefore a first object of the present invention to provide a blood pressure monitor system which measures blood pressure quickly in each periodic measurement ...
|
|
|
Ultrafast optical imaging of objects in a scattering medium
It is an object of the present invention to provide a novel imaging technique useful in the detection of hidden objects in turbid, i.e., scattering media, It is another ...
|
|
|
Device for carrying out optical measurements in turbid media
OF THE PREFERRED EMBODIMENTS FIG. 1 shows a known device for carrying out optical measurements in a turbid medium. This device is known from the cited Patent A...
|
|
|
Monitoring one or more solutes in a biological system using optical techniques
What is claimed is: 1. A method for in vivo monitoring one or more solutes in a biological system comprising the steps of: delivering light from at least one light ...
|
|
|
Peripheral arterial monitoring instruments
What is claimed is: 1. Instrumentation for performing measurements of arterial volume comprising: an inflatable cuff; means, connected to said cuff, for inflating and ...
|
|
|
Ultrasonic transducer assembly for medical diagnostic examinations
It is an object of the invention to provide ultrasonic transducer assemblies which include a member made of a specific type of polymer material. According to one ...
|
|
|
Electromechanical semiconductor transducer
In order to solve the problems involved in the conventional silicon-based electromechanical semiconductor transducer, the present inventors have devised an ...
|
|
|
Single diaphragm transducer with multiple sensing elements
It is a principal object of the present invention to provide a pressure sensor capable of accurately measuring non-uniform pressures. It is a further object of the ...
|
|
|
Cosmetic Surgery 
