Non-invasive detection of cerebral vasospasm
AssigneeJan Medical, Inc.
InventorsPaul A. Lovoi, Peter J. Neild, Ray Schumacher
Life of this patent
Estimating the term…
Abstract
Cerebral vasospasm is detected in subarachnoid hemorrhage patients by use of highly sensitive accelerometers in contact with the head. Acceleration data can be investigated in the time domain, typically averaged over a number of heartbeats, to detect a drop in energy during diastole, and diastole/systole ratio can be compared with known data of normal and vasospastic patients. Data from one or more accelerometers can also be subjected to FFT and optionally plotted in a waterfall diagram, to observe the appearance of energy at higher frequencies as 50 Hz to 1000 Hz, also indicating vasospasm.
Claims18
A method for detecting cerebral vasospasm, comprising:
- providing an accelerometer array comprising six accelerometers affixed to adjustable plastic bands;
- placing the accelerometer array on a patient such that two accelerometers are placed bi-frontally, two accelerometers are placed bi-temporally, one accelerometer is placed over the occipital region and one accelerometer is placed at the vertex in contact with the scalp of the patient;
- noninvasively sensing and recording heartbeat pulsing-induced cranial accelerations in the patient using the accelerometer array, to produce acceleration data,
- converting the acceleration data to the frequency domain by Fourier transform, and
- observing, as compared to a non-vasospastic patient, an increase in energy of accelerations at higher frequencies of about 50 Hz to 1000 Hz, indicative of vasospasm.
A method for detecting cerebral vasospasm in a patient, the method comprising:
- using six accelerometers affixed to a system of adjustable plastic bands such that two accelerometers are placed bi-frontally, two accelerometers are placed bi-temporally, one accelerometer is placed over the occipital region and one accelerometer is placed at the vertex in contact with the scalp of the patient;
- non-invasively sensing and recording heartbeat pulsing-induced cranial accelerations using the six accelerometer simultaneously, to produce acceleration data;
- converting the acceleration data to the frequency domain by Fourier transform;
- and
- diagnosing vasospasm in the patient by observing in the acceleration data converted to the frequency domain, as compared to a non-vasospastic patient, an increase in energy of accelerations at higher frequencies of about 50 Hz to 1000 Hz.
A system for detecting cerebral vasospasm in a patient, the system comprising:
- a headset comprising six accelerometers affixed to a system of adjustable plastic bands, wherein the headset is configured such that two accelerometers are placed bi-frontally, two accelerometers are placed bi-temporally, one accelerometer is placed over the occipital region and one accelerometer is placed at the vertex in contact with the scalp of the patient;
- and
- wherein the system is configured to
- non-invasively sense and record heartbeat pulsing-induced cranial accelerations using the headset, to produce acceleration data,
- convert the acceleration data to the frequency domain by Fourier transform, and
- diagnose vasospasm in the patient by observing in the acceleration data converted to the frequency domain, as compared to a non-vasospastic patient, an increase in energy of accelerations at higher frequencies of about 50 Hz to 1000 Hz.
Dependencies are inferred from the claim text.