Vascular testing system
First Claim
1. A method of vascular testing, the method comprising:
- inflating a cuff at a vascular location;
controllably deflating the cuff;
producing a pressure waveform while deflating the cuff; and
producing an output representing a pressure at a return of blood flow, while deflating the cuff, based upon analysis of the pressure waveform, wherein the output represents a pressure that corresponds to an oscillation amplitude of about seventy-five percent (75%) of a peak oscillation amplitude derived from a portion of a pressure oscillation waveform in which pressure values are generally greater than a pressure value corresponding to the peak oscillation amplitude.
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Accused Products
Abstract
A method of vascular testing includes inflating a cuff at a vascular location, controllably deflating the cuff, producing a pressure waveform while deflating the cuff, and producing an output representing a pressure at which blood flow returns, while deflating the cuff, based upon analysis of the pressure waveform. Further, a testing system for measuring vascular pressures according to the present invention includes a pressure applicator, a pressure sensor, and a diagnostic test unit. The pressure applicator is positionable along exterior portions of a human body for dynamically applying pressure to a desired vascular location. The pressure sensor is capable of detecting oscillations in a pressure at the pressure applicator. The testing system is capable of determining a peak pressure oscillation amplitude, and is also capable of determining, as a function of the peak pressure oscillation amplitude, a pressure of a return of flow at the desired vascular location as pressure applied to the desired vascular location by the pressure applicator is lessened.
45 Citations
21 Claims
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1. A method of vascular testing, the method comprising:
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inflating a cuff at a vascular location; controllably deflating the cuff; producing a pressure waveform while deflating the cuff; and producing an output representing a pressure at a return of blood flow, while deflating the cuff, based upon analysis of the pressure waveform, wherein the output represents a pressure that corresponds to an oscillation amplitude of about seventy-five percent (75%) of a peak oscillation amplitude derived from a portion of a pressure oscillation waveform in which pressure values are generally greater than a pressure value corresponding to the peak oscillation amplitude. - View Dependent Claims (2, 3)
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4. A testing system for measuring vascular pressures, the testing system comprising:
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a pressure applicator positionable along exterior portions of a human body, for dynamically applying pressure to a desired vascular location; a pressure sensor capable of detecting oscillations in a pressure at the pressure applicator; and means for determining, as a function of a peak pressure oscillation amplitude, a pressure at a return of blood flow at the desired vascular location as pressure applied to the desired vascular location by the oscillometric pressure applicator is lessened, wherein the pressure at the return of blood flow at the desired vascular location corresponds to an oscillation amplitude of about seventy-five percent (75%) of the peak pressure oscillation amplitude at a first portion of a waveform representing detected pressure oscillation amplitude and wherein the first portion of the waveform has pressure values that are generally greater than a pressure value corresponding to the peak pressure oscillation amplitude. - View Dependent Claims (5, 6, 7, 8, 9)
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10. A method of vascular testing, the method comprising:
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inflating a cuff to occlude blood flow; deflating the cuff over a time period; sensing cuff pressure to produce an pressure signal representing pressure as a function of time, during the time period; deriving from the pressure signal a relationship of oscillation amplitude as a function of cuff pressure; and determining a pressure at a return of blood flow based upon the relationship of oscillation amplitude as a function of cuff pressure, wherein the pressure at the return of blood flow is determined at a pressure corresponding to an oscillation amplitude of seventy-five percent (75%) of the peak pressure oscillation amplitude at a high pressure portion of a waveform representing oscillation amplitude, and wherein the high pressure portion of the waveform is defined at pressure that are greater than a pressure corresponding to the peak pressure oscillation amplitude. - View Dependent Claims (11)
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12. A method for deriving vascular pressures, the method comprising:
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providing an applied pressure higher than a patient'"'"'s systolic blood pressure to a vascular location; decreasing the applied pressure; detecting oscillations in a pressure measurement taken at the vascular location, wherein the pressure measurement includes vascular pressures and the applied pressure; determining a peak oscillation amplitude of oscillations in the pressure measurement; and deriving a measured pressure at a return of blood flow at the vascular location as a function of the peak oscillation amplitude of the oscillations in the pressure measurement, wherein the measured pressure at the return of blood flow is a pressure corresponding to an oscillation amplitude of about seventy-five percent (75%) of the peak value of the amplitude of the oscillations in the pressure measurement and has a pressure value greater than a pressure value corresponding to the peak value of the amplitude of die oscillations in the pressure measurement. - View Dependent Claims (13)
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14. A method of vascular testing, the method comprising:
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inflating a cuff to a pressure that occludes blood flow; decreasing cuff pressure; sensing cuff pressure to produce a signal representing cult pressure as a function of time as the cuff pressure is decreased; deriving, from the signal, amplitudes of oscillations as a function of cuff pressure; determining a peak oscillation implitude of the derived oscillations; determining a cuff pressure associated with a derived oscillation amplitude that is about seventy-five percent (75%) of the peak oscillation amplitude at a pressure higher than a pressure corresponding to the peak oscillation amplitude; and producing an output representing a pressure at a return of bloodflow as a function of the cuff pressure associated with the derived oscillation amplitude. - View Dependent Claims (15)
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16. A testing system comprising:
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a cuff; a pressure sensor for sensing cuff pressure; means for deriving an oscillometric signal from the sensed cuff pressure; and means for deriving from the oscillometric signal a pressure at a return of blood flow, wherein the pressure at the return of blood flow corresponds to an oscillation amplitude of about seventy-five percent (75%) of a peak pressure oscillation amplitude of the oscillometric signal at a pressure that is greater than a pressure corresponding to the peak pressure oscillation amplitude. - View Dependent Claims (17, 18, 19, 20, 21)
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Specification