Method of locating the tip of a central venous catheter
First Claim
1. A method of locating a tip of a central venous catheter based on a reference P wave detected by a reference pair of electrodes, a first P wave detected by a first pair of electrodes disposed near the tip of the central venous catheter, and a second P wave detected by a second pair of electrodes disposed on the central venous catheter and spaced proximally from the first pair, the method comprising:
- determining a first deflection value as a function of the first P wave;
determining a second deflection value as a function of the second P wave;
calculating a reference deflection value as a function of the reference P wave;
comparing the first deflection value to the second deflection value;
comparing the reference P wave with at least one of the first and second P waves; and
determining a location of the tip of the central venous catheter based on the comparison of the first and second deflection values and the comparison of the reference P wave with at least one of the first and second P waves.
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Abstract
A method of locating a tip of a central venous catheter (“CVC”) having a distal and proximal pair of electrodes disposed within the superior vena cava, right atrium, and/or right ventricle. The method includes obtaining a distal and proximal electrical signal from the distal and proximal pair of electrodes and using those signals to generate a distal and proximal P wave, respectively. A deflection value is determined for each of the P waves. A ratio of the deflection values is then used to determine a location of the tip of the CVC. Optionally, the CVC may include a reference pair of electrodes disposed within the superior vena cava from which a reference deflection value may be obtained. A ratio of one of the other deflection values to the reference deflection value may be used to determine the location of the tip of the CVC.
1507 Citations
6 Claims
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1. A method of locating a tip of a central venous catheter based on a reference P wave detected by a reference pair of electrodes, a first P wave detected by a first pair of electrodes disposed near the tip of the central venous catheter, and a second P wave detected by a second pair of electrodes disposed on the central venous catheter and spaced proximally from the first pair, the method comprising:
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determining a first deflection value as a function of the first P wave; determining a second deflection value as a function of the second P wave; calculating a reference deflection value as a function of the reference P wave; comparing the first deflection value to the second deflection value; comparing the reference P wave with at least one of the first and second P waves; and determining a location of the tip of the central venous catheter based on the comparison of the first and second deflection values and the comparison of the reference P wave with at least one of the first and second P waves. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification