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 an 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 oscillometric pressure waveform.
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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.
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Citations
22 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 an 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 oscillometric pressure waveform. - 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 of a return of flow at the desired vascular location as pressure applied to the desired vascular location by the oscillometric pressure applicator is lessened. - 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 of return of blood flow based upon the relationship of oscillation amplitude as a function of cuff pressure. - 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 the vascular location as a function of the peak oscillation amplitude of the oscillations in the pressure measurement. - View Dependent Claims (13, 14)
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15. 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 cuff 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 amplitude of the oscillations; and
determining a cuff pressure associated with an oscillation amplitude that is a predetermined percentage of the peak oscillation amplitude. - View Dependent Claims (16)
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17. 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 return of flow pressure. - View Dependent Claims (18, 19, 20, 21, 22)
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Specification