System for automated measurement of skin perfusion pressure
First Claim
1. An automated skin perfusion pressure measuring device comprising:
- an inflatable cuff;
at least one blood flow sensor in communication with the cuff;
at least one pressure sensor in communication with the cuff for reading pressure levels in the cuff;
a pressure instrument in fluid communication with the cuff for inflation and deflation thereof, the pressure instrument comprising;
a source of pressurized air;
a conduit connected to the source of pressurized air and the cuff, thereby placing the source of pressurized air in fluid communication with the cuff;
a microprocessor arranged to receive inputs from the first sensor and the second sensor, the microprocessor capable of controlling pressurized airflow to and from the cuff;
a computer program executable by the microprocessor such that when executed, the computer program causes the microprocessor to;
initiate an automatic inflation sequence resulting in a no flow condition;
initiate an automatic deflation sequence;
automatically qualify a perfusion measurement as an SPP value upon all conditions of a set of predetermined conditions being met during the deflation sequence.
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Accused Products
Abstract
An automatic skin perfusion measuring system including instrumentation that automatically analyzes perfusion measurements to identify motion artifact and SPP values and a sensor placement device is provided. The instrumentation is configured to ignore motion artifact. Perfusion measurements are designated as SPP values if various criteria are met. SPP value criteria pertain to factors including cuff pressure, perfusion, perfusion change percentages relative to previous and subsequent perfusion measurements, and whether perfusion measurements are increasing or decreasing relative to previous and subsequent perfusion measurements. The sensor placement device assures reliable data is produced when multiple measurements are desired.
80 Citations
73 Claims
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1. An automated skin perfusion pressure measuring device comprising:
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an inflatable cuff; at least one blood flow sensor in communication with the cuff; at least one pressure sensor in communication with the cuff for reading pressure levels in the cuff; a pressure instrument in fluid communication with the cuff for inflation and deflation thereof, the pressure instrument comprising; a source of pressurized air; a conduit connected to the source of pressurized air and the cuff, thereby placing the source of pressurized air in fluid communication with the cuff; a microprocessor arranged to receive inputs from the first sensor and the second sensor, the microprocessor capable of controlling pressurized airflow to and from the cuff; a computer program executable by the microprocessor such that when executed, the computer program causes the microprocessor to; initiate an automatic inflation sequence resulting in a no flow condition; initiate an automatic deflation sequence; automatically qualify a perfusion measurement as an SPP value upon all conditions of a set of predetermined conditions being met during the deflation sequence. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40)
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41. A method of measuring skin perfusion pressure in a patient comprising:
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providing an inflatable cuff in communication with at least one blood flow sensor; initiating an automatic inflation sequence resulting in a no flow condition; initiating an automatic deflation sequence; and providing a microprocessor to automatically qualify a perfusion measurement as an SPP value upon all conditions of a predetermined set of conditions being met during the deflation sequence, wherein said predetermined set of conditions comprise (i) determining whether said perfusion measurement is within a range of from approximately 1 mmHg to approximately 150 mmHg;
determining whether a perfusion increase from a prior measurement is greater than a predetermined minimum increase value;
determining whether said perfusion measurement is from between 0.05% to 0.2%; and
determining whether next steps following said perfusion measurement are not decreasing. - View Dependent Claims (42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55)
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56. A device for measuring skin perfusion pressure in a patient comprising:
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an inflatable cuff with perfusion sensing means for sensing perfusion in communication with said cuff; means for automatically inflating the cuff, according to an automatic inflation sequence, to a pressure resulting in a no flow condition; means for automatically deflating the cuff according to an automatic deflation sequence; means for continuously testing a series of perfusion measurements against a set of predetermined criteria to reject motion artifact and automatically qualify one of said perfusion measurements as an SPP value upon all conditions of the predetermined set of criteria being met. - View Dependent Claims (57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73)
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Specification