DEVICE AND METHOD TO POSITION A CANNULA FOR NERVE BLOCK
First Claim
1. A device to position a cannula or a catheter for nerve block for use with a unipolar cannula (10), which is electrically insulated around its axial length, the device comprising:
- a stimulation device (20) to generate an electrical signal;
an electrically conductive bare stimulation electrode (12) provided on a distal end of the unipolar cannula (10);
a skin electrode (14), which can be applied to a body surface (26) of a patient with an electrically conductive contact;
wherein the stimulation electrode (12) and the skin electrode (14) can be connected to the stimulation device (20), so that the electrical signals are routed from the stimulation electrode (12) through a patient'"'"'s body (28) to the skin electrode (14);
wherein the stimulation device (20) comprises a measuring device (22) to measure the electrical resistance between the stimulation electrode (12) and the skin electrode (14), andwherein the stimulation device (20) comprises an alarm device (24) which produces an audible alarm signal when the measured resistance exceeds an adjustable threshold value.
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Accused Products
Abstract
A device and method to position a cannula or a catheter for nerve block are provided for use with a unipolar cannula (10), which is electrically insulated around its axial length. The device includes a stimulation device (20) to generate an electrical signal, an electrically conductive bare stimulation electrode (12) provided on a distal end of the unipolar cannula (10) and a skin electrode (14), which can be applied to a body surface (26) of a patient with an electrically conductive contact. The stimulation electrode (12) and the skin electrode (14) can be connected to the stimulation device (20), so that the electrical signals are routed from the stimulation electrode (12) through a patient'"'"'s body (28) to the skin electrode (14). Further, the stimulation device (20) includes a measuring device (22) to measure the electrical resistance between the stimulation electrode (12) and the skin electrode (14) and the stimulation device (20) includes an alarm device (24) which produces an audible alarm signal when the measured resistance exceeds an adjustable threshold value.
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Citations
17 Claims
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1. A device to position a cannula or a catheter for nerve block for use with a unipolar cannula (10), which is electrically insulated around its axial length, the device comprising:
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a stimulation device (20) to generate an electrical signal; an electrically conductive bare stimulation electrode (12) provided on a distal end of the unipolar cannula (10); a skin electrode (14), which can be applied to a body surface (26) of a patient with an electrically conductive contact; wherein the stimulation electrode (12) and the skin electrode (14) can be connected to the stimulation device (20), so that the electrical signals are routed from the stimulation electrode (12) through a patient'"'"'s body (28) to the skin electrode (14); wherein the stimulation device (20) comprises a measuring device (22) to measure the electrical resistance between the stimulation electrode (12) and the skin electrode (14), and wherein the stimulation device (20) comprises an alarm device (24) which produces an audible alarm signal when the measured resistance exceeds an adjustable threshold value. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method to position a cannula or a catheter for nerve block, comprising the following steps:
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providing of a stimulation device which generates electrical signals; providing a cannula which is electrically insulated along its axial length and is provided with a bare electrically conductive stimulation electrode on its distal end; applying a skin electrode to the body surface of a patient in a fashion that the skin electrode is in electrically conductive contact with the body surface; connecting the cannula and the skin electrode in electrical conductance to the stimulation device in a fashion that the electrical signals of the stimulation device are applied to the stimulation electrode of the cannula and the skin electrode; penetrating the patient'"'"'s body with the cannula; measuring of the cannula in the patient'"'"'s body between the stimulation electrode and the skin electrode when the cannula penetrates; localizing the position of the distal end of the cannula with the stimulation electrode with respect to a nerve to be blocked based on the increase of the resistance when the stimulation electrode penetrates the nerve sheath of the nerve. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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Specification