Apparatus and process for producing artifact effect on sphygmometric information
First Claim
1. Apparatus for producing information indicative of the diastolic and systolic pressures of a living test subject comprising:
- means for controllably applying a selectively changeable pressure to the test subject adjacent a blood vessel;
means for measuring a time dependent fluctuating value representative of pulsatile pressure within the blood vessel;
means for measuring a value representative of the selectively changeable pressure applied externally adjacent the blood vessel;
signal producing means responsive in a predetermined manner to said pulsatile pressure representing value as a function of the applied pressure for providing an output indication of the diastolic and systolic pressures of the living test subject;
means for detecting an artifact value in at least said pulsatile pressure representing value across at least the diastolic-systolic pressure range of said test subject and providing a control indication thereof;
means responsive to a said artifact indication for inhibiting said response in said predetermined manner of said signal processing means to said detected artifact value;
control means associated with said pressure applying means for normally changing said applied pressure in a single direction across at least the diastolic-systolic pressure range of said test subject and for automatically repeating the applied pressure at which an indication of an artifact occurred through a predetermined range within and normally less than the pressure range previously applied in response to each said artifact indication across at least the diastolic-systolic pressure range of said test subject, thereby to seek artifact-free values of said pressures.
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Accused Products
Abstract
Improved method and apparatus for indicating blood pressure and the like in a varied pressure cuff system wherein blood vessel pulsation signals are supplied to signal processing means for determining the blood pressure. The blood pressure pulsations are monitored to detect artifacts and the signal processing means inhibited if an artifact is detected. Upon detection of an artifact the pressure applied by the cuff is automatically adjusted to repeat the pressure at which the artifact is detected, thereby to seek artifact-free values. The pressure-repetition may be a discrete pressure or a limited pressure range. Further, a maximum number of limited-pressure repetitions may be established, after which the entire pressure range must be repeated.
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Citations
14 Claims
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1. Apparatus for producing information indicative of the diastolic and systolic pressures of a living test subject comprising:
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means for controllably applying a selectively changeable pressure to the test subject adjacent a blood vessel; means for measuring a time dependent fluctuating value representative of pulsatile pressure within the blood vessel; means for measuring a value representative of the selectively changeable pressure applied externally adjacent the blood vessel; signal producing means responsive in a predetermined manner to said pulsatile pressure representing value as a function of the applied pressure for providing an output indication of the diastolic and systolic pressures of the living test subject; means for detecting an artifact value in at least said pulsatile pressure representing value across at least the diastolic-systolic pressure range of said test subject and providing a control indication thereof; means responsive to a said artifact indication for inhibiting said response in said predetermined manner of said signal processing means to said detected artifact value; control means associated with said pressure applying means for normally changing said applied pressure in a single direction across at least the diastolic-systolic pressure range of said test subject and for automatically repeating the applied pressure at which an indication of an artifact occurred through a predetermined range within and normally less than the pressure range previously applied in response to each said artifact indication across at least the diastolic-systolic pressure range of said test subject, thereby to seek artifact-free values of said pressures. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. In a method for producing information indicative of the diastolic and systolic pressure in the blood vessel of a living test subject, including applying a selectively changeable pressure to the test subject adjacent the blood vessel, measuring for a time dependent fluctuating value representative of pulsatile pressure within the blood vessel, measuring for a value representative of a selectively changeable pressure applied externally adjacent the blood vessel, and analyzing the pulsatile pressure representing value in a predetermined manner as a function of the applied pressure to provide an output indication of the diastolic and systolic pressures in the subject'"'"'s blood vessel, the improvement comprising:
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detecting an artifact value in at least the pulsatile pressure representing value across at least the diastolic-systolic pressure range of said test subject and providing a control indication thereof; inhibiting said analysis of said pulsatile pressure in said predetermined manner as a function of the applied pressure in response to the artifact indication thereby to at least reject the detected artifact value; and controlling the applied pressure to normally change in a single direction across at least the diastolic-systolic pressure range of said test subject and in response to an indication of artifact occurrence to automatically repeat the applied pressure at which the artifact occurred through a predetermined range within and normally less than the pressure range previously applied. - View Dependent Claims (10, 11, 12, 13, 14)
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Specification