Transcutaneous monitoring of critical perfusion-efficiency situations
First Claim
1. An apparatus automatically detecting critical perfusion-efficiency situations, comprising, in combination, first means operative for transcutaneously sensing perfusion and generating a corresponding first signal;
- second means operative for transcutaneously sensing the concentration of an indicator substance transported by the blood perfused through the tissue of interest and generating a corresponding second signal;
an alarm generator; and
signal-processing means connected to the first and second means for receipt of the first and second signals and connected to the alarm generator and operative for triggering the latter upon detection of signal changes meeting at least one predetermined rate-of-signal-change criterion.
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Abstract
First and second probes are laid against the skin to transcutaneously measure perfusion and e.g., oxygen concentration and generate corresponding first and second signals. These signals are fed to a signal-processing unit which triggers an alarm whenever changes in these signals meet predetermined rate-of-change criteria. Among these criteria is parallel increase in both perfusion and e.g., oxygen concentration, parallel decrease in both perfusion and e.g., oxygen concentration, and unchanging perfusion accompanied by decreasing e.g., oxygen concentration. The probes are occasionally pressed against the skin, for example under the control of a timer, with a pressure in excess of 1 g/cm2, to occasionally induce hyperemic conditions and see whether parallel changes in perfusion and concentration result.
56 Citations
34 Claims
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1. An apparatus automatically detecting critical perfusion-efficiency situations, comprising, in combination, first means operative for transcutaneously sensing perfusion and generating a corresponding first signal;
- second means operative for transcutaneously sensing the concentration of an indicator substance transported by the blood perfused through the tissue of interest and generating a corresponding second signal;
an alarm generator; and
signal-processing means connected to the first and second means for receipt of the first and second signals and connected to the alarm generator and operative for triggering the latter upon detection of signal changes meeting at least one predetermined rate-of-signal-change criterion. - 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)
- second means operative for transcutaneously sensing the concentration of an indicator substance transported by the blood perfused through the tissue of interest and generating a corresponding second signal;
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31. A method of monitoring critical perfusion-efficiency situations, comprising the steps of transcutaneously sensing perfusion and generating a corresponding first signal;
- transcutaneously sensing the concentration of an indicator substance transported by the blood perfused through the tissue of interest and generating a corresponding second signal; and
feeding the first and second signals to a signal-processing means operative for triggering an alarm upon detection of signal changes meeting at least one predetermined rate-of-change criterion. - View Dependent Claims (32, 33, 34)
- transcutaneously sensing the concentration of an indicator substance transported by the blood perfused through the tissue of interest and generating a corresponding second signal; and
Specification