System for Automated Measurement of Skin Perfusion Pressure
First Claim
1. An automated skin perfusion pressure measuring device comprising:
- an inflatable cuff;
a first sensor in communication with the cuff;
a second 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 one or more 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.
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Citations
98 Claims
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1. An automated skin perfusion pressure measuring device comprising:
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an inflatable cuff;
a first sensor in communication with the cuff;
a second 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 one or more 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)
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31. A method of measuring skin perfusion pressure in a patient comprising:
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providing an inflatable cuff in communication with a first sensor;
initiating an automatic inflation sequence resulting in a no flow condition;
initiating an automatic deflation sequence; and
automatically qualifying a perfusion measurement as an SPP value upon one or more conditions being met during the deflation sequence. - View Dependent Claims (32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49)
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50. 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 testing a perfusion measurement against a set of predetermined criteria to reject motion artifact and automatically qualify an SPP value. - View Dependent Claims (51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68)
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69. An automated skin perfusion pressure measuring system comprising:
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a. capillary blood flow measuring means in communication with a tissue site having capillary blood flow therewithin;
b. pressure means for simultaneously applying controllable pressure to said capillary blood flow measuring means and said tissue, said pressure means responsive to an automated sequence, said automated sequence comprising (i) occluding said capillary blood flow within said tissue; and
(ii) controllably releasing said pressure while said capillary blood flow returns;
c. measuring means for measuring said applied controllable pressure; and
d. display means for displaying the relationship between said applied controllable pressure and said capillary blood flow, said display means in communication with said capillary blood flow measuring means and said applied controllable pressure means. - View Dependent Claims (70, 71, 72, 73, 74, 75, 76, 77, 78, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98)
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79. A method for measuring skin perfusion pressure comprising:
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a. applying capillary blood flow measuring means to a tissue site having capillary blood flow therewithin;
b. simultaneously controllably applying pressure to said blood flow measuring means and said tissue site in response to an automated sequence;
c. measuring said applied controllable pressure; and
d. displaying the relationship between the applied controllable pressure and said capillary blood flow. - View Dependent Claims (80, 81, 82, 83, 84, 85, 86, 87, 88)
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Specification