Diagnosing peripheral vascular disease by monitoring oxygen saturation changes during a hyperemia phase
First Claim
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1. A method of diagnosing peripheral vascular disease by causing a body part of a patient to experience occlusion, which comprises an ischemia phase, the method comprising:
- measuring oxygen saturation in tissue of the patient during a hyperemia phase after the ischemia phase;
analyzing the oxygen saturation in the tissue during the hyperemia phase; and
diagnosing the patient as having peripheral vascular disease according to changes in the oxygen saturation in the tissue during the hyperemia phase.
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Abstract
Peripheral vascular disease is diagnosed through measurements of oxygen saturation. In a specific implementation, peripheral vascular disease is diagnosed based on changes in oxygen saturation in tissue. Ischemia is induced, and then measurements of changes in oxygen saturation in tissue are made. Based on changes in oxygen saturation during a hyperemia phase, a diagnosis is provided of whether a patient has or does not have peripheral vascular disease.
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Citations
24 Claims
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1. A method of diagnosing peripheral vascular disease by causing a body part of a patient to experience occlusion, which comprises an ischemia phase, the method comprising:
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measuring oxygen saturation in tissue of the patient during a hyperemia phase after the ischemia phase; analyzing the oxygen saturation in the tissue during the hyperemia phase; and diagnosing the patient as having peripheral vascular disease according to changes in the oxygen saturation in the tissue during the hyperemia phase. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method of diagnosing peripheral vascular disease by causing a body part of a patient to experience occlusion, which comprises an induced ischemia phase, the method comprising:
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measuring oxygen saturation of the tissue of the patient during a hyperemia phase after inducing ischemia; and diagnosing the patient as having peripheral vascular disease based on changes in the oxygen saturation of the tissue during the hyperemia phase after inducing ischemia. - View Dependent Claims (13, 14, 15, 16)
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17. A system for diagnosing peripheral vascular disease comprising:
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a probe comprising a first detector input; a computer, coupled to process signals received via the first detector input, to determine changes in oxygen saturation in tissue of a patient and make a diagnosis of peripheral vascular disease based on the oxygen saturation changes; and a display, coupled to the computer, to provide a visual indication of a positive diagnosis of peripheral vascular disease, wherein the diagnosis of peripheral vascular disease is positive when the computer determines a rate of change in the oxygen saturation crosses a threshold value during a hyperemia phase after induced ischemia.
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18. A system for diagnosing peripheral vascular disease comprising:
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a probe comprising a first detector input; a computer, coupled to process signals received via the first detector input, to determine changes in oxygen saturation in tissue of a patient and make a diagnosis of peripheral vascular disease based on the oxygen saturation changes; and a display, coupled to the computer, to provide a visual indication of a positive diagnosis of peripheral vascular disease, wherein the diagnosis of peripheral vascular disease is positive when a measured time for the oxygen saturation to cross a percentage value during a hyperemia phase after induced ischemia exceeds a specific time value.
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19. A system for diagnosing peripheral vascular disease comprising:
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a probe comprising a first detector input; a computer, coupled to process signals received via the first detector input, to determine changes in oxygen saturation in tissue of a patient and make a diagnosis of peripheral vascular disease based on the oxygen saturation changes; and a display, coupled to the computer, to provide a visual indication of a positive diagnosis of peripheral vascular disease, wherein the diagnosis of peripheral vascular disease is positive when a measured time, from a starting time value to an ending time value, for the oxygen saturation to cross a percentage value exceeds a specific time value, and the ending time is within a hyperemia phase after induced ischemia.
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20. A system for diagnosing peripheral vascular disease comprising:
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a probe comprising a first detector input; a computer, coupled to process signals received via the first detector input, to determine changes in oxygen saturation in tissue of a patient and make a diagnosis of peripheral vascular disease based on the oxygen saturation changes; and a display, coupled to the computer, to provide a visual indication of a positive diagnosis of peripheral vascular disease, wherein the diagnosis of peripheral vascular disease is positive when a measured time, from a starting time value to an ending time value, for the oxygen saturation to cross a percentage value exceeds a specific time value, and the starting time is within a hyperemia phase after induced ischemia.
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21. A system for diagnosing peripheral vascular disease comprising:
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a probe comprising a first detector input; a computer, coupled to process signals received via the first detector input, to determine changes in oxygen saturation in tissue of a patient; a cuff, controllable by the computer and attachable to the patient, wherein the cuff causes a body part of the patient to experience occlusion, which includes an ischemia phase; and a display, coupled to the computer, wherein the computer makes a diagnosis of peripheral vascular disease based on oxygen saturation changes in the tissue during a hyperemia phase after the ischemia phase, and the display provides a visual indication of a positive diagnosis of peripheral vascular disease. - View Dependent Claims (22, 23, 24)
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Specification