Method of locating the tip of a central venous catheter
First Claim
1. A method of locating a tip of a central venous catheter, the central venous catheter having a portion disposed within the superior vena cava, a distal pair of electrodes, and a proximal pair of electrodes spaced longitudinally from the distal pair of electrodes, the method comprising:
- obtaining a distal electrical signal from the distal pair of electrodes;
generating a first P wave from the distal electrical signal;
determining a first deflection value of the first P wave;
obtaining a proximal electrical signal from the proximal pair of electrodes;
generating a second P wave from the proximal electrical signal;
determining a second deflection value of the second P wave;
calculating a first ratio from the first and second deflection values;
obtaining a SVC deflection value;
calculating a second ratio of one of the first and second deflection values to the SVC deflection value; and
determining a location of the tip of the central venous catheter based on the first ratio and the second ratio.
2 Assignments
0 Petitions
Accused Products
Abstract
The invention includes 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 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.
556 Citations
9 Claims
-
1. A method of locating a tip of a central venous catheter, the central venous catheter having a portion disposed within the superior vena cava, a distal pair of electrodes, and a proximal pair of electrodes spaced longitudinally from the distal pair of electrodes, the method comprising:
-
obtaining a distal electrical signal from the distal pair of electrodes; generating a first P wave from the distal electrical signal; determining a first deflection value of the first P wave; obtaining a proximal electrical signal from the proximal pair of electrodes; generating a second P wave from the proximal electrical signal; determining a second deflection value of the second P wave; calculating a first ratio from the first and second deflection values; obtaining a SVC deflection value; calculating a second ratio of one of the first and second deflection values to the SVC deflection value; and determining a location of the tip of the central venous catheter based on the first ratio and the second ratio. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
-
Specification