System and method for detecting skin penetration
First Claim
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1. A system for detecting skin penetration, the system comprising:
- an invasive component for penetrating the skin;
a dummy electrode for making contact with the surface of the skin;
at least one penetrating electrode disposed in the invasive component;
a Wheatstone bridge circuit;
wherein a resistance across the dummy electrode and the penetrating electrode constitutes one of the resistive legs of the Wheatstone bridge circuit, anda first pair of reference electrodes for making contact with the surface of the skin, wherein a skin resistance across the first pair of reference electrodes constitutes the mirroring resistive leg, with respect to ground, of the Wheatstone bridge circuit;
wherein the system is configured to detect a depth of skin penetration of the invasive component based on a differential output voltage from the Wheatstone bridge circuit.
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Abstract
A system and method for detecting skin penetration. The system comprises an invasive component for penetrating the skin; a dummy electrode for making contact with the surface of the skin; at least one penetrating electrode disposed in the invasive component; and a Wheatstone bridge circuit; wherein a resistance across the dummy electrode and the penetrating electrode constitutes one of the resistive legs of the Wheatstone bridge circuit and skin penetration of the invasive component is detected based on a differential output voltage from the Wheatstone bridge circuit.
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Citations
29 Claims
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1. A system for detecting skin penetration, the system comprising:
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an invasive component for penetrating the skin; a dummy electrode for making contact with the surface of the skin; at least one penetrating electrode disposed in the invasive component; a Wheatstone bridge circuit; wherein a resistance across the dummy electrode and the penetrating electrode constitutes one of the resistive legs of the Wheatstone bridge circuit, and a first pair of reference electrodes for making contact with the surface of the skin, wherein a skin resistance across the first pair of reference electrodes constitutes the mirroring resistive leg, with respect to ground, of the Wheatstone bridge circuit; wherein the system is configured to detect a depth of skin penetration of the invasive component based on a differential output voltage from the Wheatstone bridge circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method for detecting skin penetration, the method comprising the steps of:
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penetrating the skin with an invasive component wherein at least one penetrating electrode is disposed in the invasive component; making contact between a dummy electrode and the surface of the skin; applying a resistance across the dummy electrode and the penetrating electrode as one of the resistive legs of a Wheatstone bridge circuit; making contact with the surface of the skin with a first pair of reference electrodes; applying a skin resistance across the first pair of reference electrodes as the mirroring resistive leg, with respect to ground, of the Wheatstone bridge circuit; and detecting a depth of skin penetration of the invasive component based on a differential output voltage from the Wheatstone bridge circuit. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
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Specification