Extravasation detection electrode patch
First Claim
1. An electrode patch for use in a non-invasive device for detecting extravasation that may occur when a needle with a tip is inserted into a patient in order to introduce fluid into the vascular system of a patient, comprising:
- a body of the patch adapted to be affixed to the skin of a patient, an outer pair of elongated electrodes and an inner pair of elongate electrodes, the length of each of said electrodes being deployed along the body of said patch, said inner pair of electrodes being spaced from one another on either side of a center line, said inner pair defining a measuring zone, said measuring zone being shaped and dimensioned to encompass a needle tip within said zone, said zone being small enough to optimize sensitivity, said inner pair being long enough to facilitate placement of the patch over a needle tip inserted into a patient, each of said outer pair of electrodes being outward, relative to said center line, of a respective one of said inner electrodes, energization of said outer electrodes, when said patch is affixed to the skin of a patient, providing a field which induces a signal in said inner electrodes that is a function of the impedance of the tissue in said measuring zone.
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Accused Products
Abstract
A medical extravasation device has an electrode patch that can attach to the skin for sensing electrical information. Tissue impedance is calculated from the electrode patch signals. The patch has elongate pick-up electrodes inboard of elongate energizing electrodes. The measuring zone determined by the elongate space between the pick-up electrodes enhances sensitivity and specificity. The presence of an extravasation is determined by interpreting the tissue impedance measurement. The method for determining the extravasation includes a first step of determining a pre-injection baseline measurement of the tissue impedance. Then, the tissue impedance is monitored during the procedure itself. A predetermined amount of change in tissue impedance is determined to indicate an extravasation.
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Citations
19 Claims
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1. An electrode patch for use in a non-invasive device for detecting extravasation that may occur when a needle with a tip is inserted into a patient in order to introduce fluid into the vascular system of a patient, comprising:
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a body of the patch adapted to be affixed to the skin of a patient, an outer pair of elongated electrodes and an inner pair of elongate electrodes, the length of each of said electrodes being deployed along the body of said patch, said inner pair of electrodes being spaced from one another on either side of a center line, said inner pair defining a measuring zone, said measuring zone being shaped and dimensioned to encompass a needle tip within said zone, said zone being small enough to optimize sensitivity, said inner pair being long enough to facilitate placement of the patch over a needle tip inserted into a patient, each of said outer pair of electrodes being outward, relative to said center line, of a respective one of said inner electrodes, energization of said outer electrodes, when said patch is affixed to the skin of a patient, providing a field which induces a signal in said inner electrodes that is a function of the impedance of the tissue in said measuring zone. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A device for use with a non-invasive detection system to detect extravasation when fluid is delivered into a patient'"'"'s vascular system, comprising:
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a) an outer pair of elongated electrodes and an inner pair of elongated electrodes, b) said inner pair of electrodes being spaced from one another on either side of a center line, said inner pair defining a measuring zone, said measuring zone being shaped and dimensioned to encompass within said zone an end of a channel inserted in the patient'"'"'s vascular system for delivering fluid into the vascular system, said zone being small enough to optimize sensitivity, said inner pair being long enough to facilitate placement of the end of the channel within the measuring zone;
c) each of said outer pair of electrodes being outward, relative to said center line, of a respective one of said inner electrodes, d) energization of said outer electrodes providing a field which induces a signal in said inner electrodes that is a function of the impedance of the tissue in said measuring zone. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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8. A device for use with a non-invasive detection system to detect extravasation when fluid is delivered into a patient'"'"'s vascular system, comprising:
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a) an outer pair of elongated electrodes and an inner pair of elongated electrodes, b) said inner pair of electrodes being spaced from one another on either side of a center line, said inner pair defining a measuring zone, said measuring zone being shaped and dimensioned to encompass within said zone an end of a channel inserted in the patient'"'"'s vascular system for delivering fluid into the vascular system, said zone being sized to detect extravasation in the measuring zone and long enough to facilitate placement of the end of the channel within the measuring zone;
c) each of said outer pair of electrodes being outward, relative to said center line, of a respective one of said inner electrodes, d) energization of said outer electrodes providing a field which induces a signal in said inner electrodes that is a function of the impedance of the tissue in said measuring zone. - View Dependent Claims (16)
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9. A device for use with a non-invasive detection system to detect extravasation when fluid is delivered into a patient'"'"'s vascular system;
- said device comprising;
a) first and second electrodes;
the electrodes being separated from each other to encompass the end of a channel inserted in the patient'"'"'s vascular system for delivering fluid into the vascular system;
b) the first and second electrodes defining a measuring zone;
the measuring zone being sized to detect extravasation in the measuring zone; and
c) third and fourth electrodes to provide an electrical field which induces a voltage signal between the first and second electrodes;
said signal being a function of the impedance of the tissue in the measuring zone. - View Dependent Claims (17, 18, 19)
- said device comprising;
Specification