Method of locating the tip of a central venous catheter
First Claim
1. A non-transitory, computer-readable storage medium having stored thereon logic for determining a location of a tip of a central venous catheter based on a reference P wave detected by a reference pair of electrodes, the logic, that upon execution by one or more processors, performs operations comprising:
- detecting a reference P wave by the reference pair of electrodes;
detecting a first P wave by a first pair of electrodes disposed near the tip of the central venous catheter;
detecting a second P wave by a second pair of electrodes disposed on the central venous catheter and spaced proximally from the first pair of electrodes;
calculating a first deflection value as a function of the first P wave;
calculating 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;
determining a location of the tip of the central venous catheter based on a comparison of the first and second deflection values and a comparison of the reference P wave with at least one of the first and second P waves; and
generating a display image providing real-time feedback of the location of the tip of the central venous catheter, the display image configured to be displayed on a display device, wherein the display image of the real-time feedback includes (i) an image of a lumen or an organ, and (ii) a visual representation of an estimated location of the tip of the central venous catheter, wherein the display image of the real-time feedback further includes an indicator configured to provide guidance as to whether the central venous catheter is to be withdrawn or advanced based on one or more of (i) the comparison of the first and second deflection values or (ii) the comparison of the reference P wave with at least one of the first and second P waves.
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Accused Products
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.
1549 Citations
14 Claims
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1. A non-transitory, computer-readable storage medium having stored thereon logic for determining a location of a tip of a central venous catheter based on a reference P wave detected by a reference pair of electrodes, the logic, that upon execution by one or more processors, performs operations comprising:
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detecting a reference P wave by the reference pair of electrodes; detecting a first P wave by a first pair of electrodes disposed near the tip of the central venous catheter; detecting a second P wave by a second pair of electrodes disposed on the central venous catheter and spaced proximally from the first pair of electrodes; calculating a first deflection value as a function of the first P wave; calculating 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; determining a location of the tip of the central venous catheter based on a comparison of the first and second deflection values and a comparison of the reference P wave with at least one of the first and second P waves; and generating a display image providing real-time feedback of the location of the tip of the central venous catheter, the display image configured to be displayed on a display device, wherein the display image of the real-time feedback includes (i) an image of a lumen or an organ, and (ii) a visual representation of an estimated location of the tip of the central venous catheter, wherein the display image of the real-time feedback further includes an indicator configured to provide guidance as to whether the central venous catheter is to be withdrawn or advanced based on one or more of (i) the comparison of the first and second deflection values or (ii) 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, 7)
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8. A system for determining a location of a tip of a central venous catheter, the system comprising:
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a first pair of electrodes disposed near the tip of the central venous catheter for detecting a first P wave; a second pair of electrodes disposed on the central venous catheter and spaced proximally from the first pair of electrodes, the second pair of electrodes for detecting a second P wave; a reference pair of electrodes for a reference P wave disposed on the central venous catheter and spaced proximal from the first pair of electrodes and the second pair of electrodes; one or more processors communicatively coupled to the reference pair of electrodes, the first pair of electrodes and the second pair of electrodes; a display device communicatively coupled to the one or more processors; and a storage module communicatively coupled to the one or more processors, the storage module comprising logic, that when executed by the one or more processors, causes performance of operations comprising; calculating a first deflection value as a function of the first P wave; calculating 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; determining the location of the tip of the central venous catheter based on a comparison of the first deflection value and the second deflection value and a comparison of the reference P wave with at least one of the first P wave and the second P wave; and providing a display of real-time feedback of the location of the tip of the central venous catheter with the display device, wherein the display of the real-time feedback includes (i) an image of a lumen or an organ, and (ii) a visual representation of the location of the tip of the central venous catheter, wherein the display of the real-time feedback further includes an indicator configured to provide guidance as to whether the central venous catheter is to be withdrawn or advanced based on one or more of (i) the comparison of the first deflection value and the second deflection value or (ii) the comparison of the reference P wave with at least one of the first P wave and the second P wave. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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Specification