Cardiovascular instrument
First Claim
1. In a cariovascular instrument in which the aforesaid clock circuit having a plurality of nonintrusive pulse transducers adapted to be placed at spaced locations on the body of a living animal for providing an electrical pulse signal corresponding to the circulatory pulse activity of said animal, signal processing circuit means connected to each of said nonintrusive pulse transducers for amplifying and shaping said electrical pulse signal provided thereby, a clock circuit for generating a timing signal having a plurality of time related pulses and two clock signal outputs, a pulse period circuit means connected to said clock circuit and to one of said signal processing circuit means for producing a pulse period control signal between adjacent pulses of said electrical pulse signal, and display means for displaying said pulse period as a time between adjacent pulses of said electrical pulse signal, the improvement comprising:
- an intervalometer circuit selectively connected to said signal processing circuit means for determining the time interval between pulses of said electrical pulse signals generated by separate ones of said nonintrusive pulse transducers;
said intervalometer circuit including, electrically operated switch means connected to said signal processing circuit means to receive the shaped electrical pulse signal therefrom for producing a control signal output therefrom having a pulse duration corresponding to the time separation between the electrical pulse signals, gate circuit means connected to said electrically operated switch means to receive said control signal therefrom and effectively connected between the aforesaid clock circuit and the aforesaid display means for passage of a predetermined number of clock pulses therebetween, a display decoder, latch, and counter circuit connected to said display means for holding a count signal between successive control signals;
a first monostable multivibrator connected between the control input of said gate circuit and said display decoder, latch and counter circuit for generating a transfer control signal pulse in response to control signals applied to said gate circuit;
a second monostable multivibrator circuit connected between said first monostable multivibrator and said display decoder, latch, and counter circuit for generating a clear control signal pulse in response to the generated transfer control signal pulse; and
a manually operable switch connected to said gate control input and the output of said electrically operated switch means and the aforesaid pulse period circuit means such that said gate circuit may be selectively controlled by the respective control output signals therefrom and also, connected between said clock input of said gate circuit and the aforesaid clock circuit, whereby the appropriate one of said two clock outputs will be selected with the control output signals.
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Abstract
A cardiovascular monitoring system employs photoelectric monitoring circuits to obtain analog signals corresponding to the heart beat of the subject. Cooperating amplification circuitry amplifies and shapes the heart beat signals to produce digital electrical pulses. Circuitry is provided which measures the time between adjacent pulses from a single detector or, selectively, adjacent pulses from spaced detectors. Digital read-out circuitry displays this time signal as either the period between adjacent pulses from a single detector or the time difference representing the velocity of blood flow between the spaced points covered by a plurality of detectors.
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Citations
3 Claims
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1. In a cariovascular instrument in which the aforesaid clock circuit having a plurality of nonintrusive pulse transducers adapted to be placed at spaced locations on the body of a living animal for providing an electrical pulse signal corresponding to the circulatory pulse activity of said animal, signal processing circuit means connected to each of said nonintrusive pulse transducers for amplifying and shaping said electrical pulse signal provided thereby, a clock circuit for generating a timing signal having a plurality of time related pulses and two clock signal outputs, a pulse period circuit means connected to said clock circuit and to one of said signal processing circuit means for producing a pulse period control signal between adjacent pulses of said electrical pulse signal, and display means for displaying said pulse period as a time between adjacent pulses of said electrical pulse signal, the improvement comprising:
- an intervalometer circuit selectively connected to said signal processing circuit means for determining the time interval between pulses of said electrical pulse signals generated by separate ones of said nonintrusive pulse transducers;
said intervalometer circuit including, electrically operated switch means connected to said signal processing circuit means to receive the shaped electrical pulse signal therefrom for producing a control signal output therefrom having a pulse duration corresponding to the time separation between the electrical pulse signals, gate circuit means connected to said electrically operated switch means to receive said control signal therefrom and effectively connected between the aforesaid clock circuit and the aforesaid display means for passage of a predetermined number of clock pulses therebetween, a display decoder, latch, and counter circuit connected to said display means for holding a count signal between successive control signals;
a first monostable multivibrator connected between the control input of said gate circuit and said display decoder, latch and counter circuit for generating a transfer control signal pulse in response to control signals applied to said gate circuit;
a second monostable multivibrator circuit connected between said first monostable multivibrator and said display decoder, latch, and counter circuit for generating a clear control signal pulse in response to the generated transfer control signal pulse; and
a manually operable switch connected to said gate control input and the output of said electrically operated switch means and the aforesaid pulse period circuit means such that said gate circuit may be selectively controlled by the respective control output signals therefrom and also, connected between said clock input of said gate circuit and the aforesaid clock circuit, whereby the appropriate one of said two clock outputs will be selected with the control output signals.
- an intervalometer circuit selectively connected to said signal processing circuit means for determining the time interval between pulses of said electrical pulse signals generated by separate ones of said nonintrusive pulse transducers;
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2. A cardiovascular instrument according to claim 1 in which the aforesaid clock circuit is constructed such that the two clock signal outputs are decimally related.
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3. A cardiovascular instrument according to claim 2 in which the aforesaid clock circuit is constructed such that the two clock signal outputs have freqUencies of 1,000 Hertz and 100 Hertz respectively.
Specification
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- Resources
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Current AssigneeRobert E. Page
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Original AssigneeRobert E. Page
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InventorsPage, Robert E.
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Primary Examiner(s)Kamm, William E.
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Application NumberUS05/526,987Time in Patent Office309 DaysField of Search128/2.5A,2.5P,2.5R,2.5T,2.6A,2.6F,2.6RUS Class Current600/502CPC Class CodesA61B 5/024 Detecting, measuring or rec...A61B 5/0285 Measuring or recording phas...
