Myocardial ischemia detection system
First Claim
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1. Apparatus for the diagnostic display of a motion signal;
- characterizing ventricular wall motion of a patient'"'"'s heart;
from cardiac induced compression waves detected at the surface of said patient'"'"'s body;
to a diagnostician comprising;
compression wave monitoring means, responsive to compression waves at the surface of said patient'"'"'s body, for generating a plurality of compression wave signals corresponding to said ventricular wall motion;
selecting means for detecting the systolic time interval of normal sinus beats of said patient'"'"'s heart, and for generating a data collection window interval during such systolic time interval;
means for averaging said compression wave signals collected during said data collection window intervals; and
for generating a composite wave form from said collected compression wave signals.display means for presenting a representation of said composite waveform to said diagnostician.
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Abstract
A method and apparatus for non invasively monitoring the motion of the patient'"'"'s heart, to detect and display ischemia induced variations in the heart'"'"'s motion which indicate coronary artery disease.
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Citations
21 Claims
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1. Apparatus for the diagnostic display of a motion signal;
- characterizing ventricular wall motion of a patient'"'"'s heart;
from cardiac induced compression waves detected at the surface of said patient'"'"'s body;
to a diagnostician comprising;compression wave monitoring means, responsive to compression waves at the surface of said patient'"'"'s body, for generating a plurality of compression wave signals corresponding to said ventricular wall motion; selecting means for detecting the systolic time interval of normal sinus beats of said patient'"'"'s heart, and for generating a data collection window interval during such systolic time interval; means for averaging said compression wave signals collected during said data collection window intervals; and
for generating a composite wave form from said collected compression wave signals.display means for presenting a representation of said composite waveform to said diagnostician.
- characterizing ventricular wall motion of a patient'"'"'s heart;
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2. Apparatus for the diagnostic display of a motion signal, characterizing the ventricular wall motion, of a patient'"'"'s heart, derived from heartbeat induced compression waves detected at the surface of said patient'"'"'s body, each heartbeat corresponding to the motion of the heart during one complete cardiac cycle, to a diagnostician comprising:
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means for collecting compression wave information during cardiac heartbeats creating compression wave data; means for selecting the cardiac contraction portion of said compression wave data for each heartbeat, creating a cardiac contraction compression wave record for each heartbeat; means for averaging said cardiac contraction compression wave records, creating a composite compression wave record reflecting the ventricular wall motion of several heartbeats; means for displaying said composite compression wave record to said diagnostician. - View Dependent Claims (3, 4, 6)
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5. The apparatus 2 wherein said means for averaging said ventricular contraction compression wave records, creating a composite compression wave record comprises:
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fiducial marking means for designating segments of said ventricular contraction compression wave records; arithmetic means for adding a series of said compression wave records indexed by said fiducial marking means, whereby said arithmetic means generates a composite compression wave record.
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7. Apparatus for the diagnostic display of a motion signal characterizing the ventricular wall motion, of a patient'"'"'s heart, derived from cardiac heartbeat induced compression waves detected at the surface of a patient'"'"'s body, each heartbeat corresponding to the motion of the heart during one complete cardiac cycle, to a diagnostician comprising:
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inertial transducer means responsive to motion at the surface of said patient, for collecting compression wave information during selected cardiac heartbeats creating compression wave data; means for selecting the cardiac contraction portion of each of said heartbeats, creating a cardiac contraction compression wave record for each of said selected heartbeats; means for averaging said cardiac contraction compression wave records, creating a composite compression wave record reflecting the ventricular wall motion of several heartbeats; means for displaying said composite compression wave record to said diagnostician.
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8. Apparatus for acquiring cardiovascular diagnostic data from a patient'"'"'s heart, and for displaying said diagnostic data to a diagnostician comprising:
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inertial transducer means, adapted to be coupled to the surface of said patient, for collecting compression wave data, arising from the motion of said patient'"'"'s heart during a cardiac cycle of said patient'"'"'s heart; cardiac event marker means for generating index data corresponding to selected portions of cardiac cycles of said patient'"'"'s heart; processing means coupled to said inertial transducer means and coupled to said cardiac event marker means;
for averaging a plurality of said selected portions of compression wave data generating display data;display means coupled to said processing means for presenting said display data to said diagnostician. - View Dependent Claims (9)
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10. Apparatus for detecting and characterizing the cardiac wall motion of a patient'"'"'s heart comprising:
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independent marker means for generating a representation f said patient'"'"'s cardic rhythm; seismocardiographic means for detecting compression waves resulting from cardiac wall motion; detector means, coupled to said independent marker means, for detecting individual beats of said patient'"'"'s heart, and for defining a plurality of measurement windows, each window corresponding to one of said individual beats of said patient'"'"'s heart; selector means for collecting seismocardiographic data during each of said measurement windows, generating collected seismocardiographic data; averaging means, coupled to said selector means for generating a composite representation of cardiac wall motion from said collected seismocardiographic data; diagnostic display means coupled to said averaging means for presenting said composite representation to said diagnostician. - View Dependent Claims (11, 12, 13, 14, 15)
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16. Apparatus for the collection and display of data characterizing the motion of as patient'"'"'s heart during heartbeat cycles, each heartbeat cycle corresponding to the motion of the heart during one complete cardiac cycle comprising:
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compression wave monitoring means proximate said patient'"'"'s heart, for generating compression waveform data corresponding to the motion of said patient'"'"'s heart during said heartbeat cycles; segmenting means for generating compression wavedata sets, each data set corresponding to heart motion during a portion of a heartbeat cycle; indexing means for defining fiducial points in each of said compression wave data sets; averaging means for collecting compression wave data sets and for averaging said compression wave data about said fiducial points, generating representative compression wave data; display means for generating a diagnostic representation of said representative compression wave data. - View Dependent Claims (17, 18, 19, 20)
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21. A method for the collection and display of data characterizing the motion of a patient'"'"'s heart comprising the steps of:
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(a) collecting compression wave data from the surface of said patient at a location near said patient'"'"'s heart; (b) defining a set of compression wave records, each of said records corresponding to the motion of said patient'"'"'s heart during one heartbeat cycle; (c) collecting a set of said heartbeat records corresponding to natural sinus rhythm of said patient'"'"'s heart; (d) averaging said records collected in step (c) to form a representative record; (e) displaying data corresponding to said representative record.
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Specification