Implantation of medical device with measurement of body surface potential

• US 7,421,300 B2
• Filed: 10/31/2005
• Issued: 09/02/2008
• Est. Priority Date: 10/31/2005
• Status: Expired due to Fees

• Current Assignee: Medtronic Incorporated (Medtronic Plc)
• Original Assignee: Medtronic Incorporated (Medtronic Plc)
• Inventors: Smits, Karel F. A. A.
• Primary Examiner(s): Bockelman; Mark
• Assistant Examiner(s): Dinga; Roland
• Application Number:
  US11/263,101
• Publication Number:
  US 20070100382A1
• Time in Patent Office: 1,037 Days
• Field of Search: 607/5, 607/119, 607/122, 607/129, 600/393, 600/508, 600/512, 600/509, 600/424, 606/129, 606/130, 128/898
• US Class Current: 607/119
• CPC Class Codes: A61B 5/282 Holders for multiple electrodes for introduction into the body A61B5/287
• CPC Class Codes: A61B 5/341 Vectorcardiography [VCG]
• CPC Class Codes: A61B 5/7257 using Fourier transforms
• CPC Class Codes: A61N 1/3925 Monitoring; Protecting
• CPC Class Codes: A61N 1/3956 Implantable devices for applying electric shocks to the heart, e.g. for cardioversion

Abstract

Methods of implanting at least one lead for a cardio defibrillator using body surface potential (BSP) electrodes are disclosed. The methods may include installing defibrillation electrodes in a patient, attaching at least three BSP electrodes to the patient'"'"'s skin, creating a potential difference between the defibrillation electrodes, and measuring the resulting body surface potential at the three BSP electrodes. Once the resulting BSP is measured, the methods may include determining the amplitude of a resultant vector formed by the measured BSP potential differences. The location of a defibrillation electrode may then be manipulated to increase the amplitude of the resultant vector formed by the measured BSP potential differences.

Claims

1. A method of implanting at least one lead for a cardio defibrillator, comprising:

a. installing a RV defibrillation electrode in a right ventricle of a patient'"'"'s heart;

b. installing a second defibrillation electrode in the patient;

c. attaching at least three body surface potential (BSP) electrodes capable of measuring body surface potential to the patient'"'"'s skin;

d. creating a potential difference between the RV defibrillation electrode and the second defibrillation electrode;

e. measuring the body surface potential at the at least three body surface potential (BSP) electrodes caused by the potential difference between the defibrillation electrodes;

f. determining the amplitude of a resultant vector formed by the measured potential differences between the at least three body surface potential (BSP) electrodes, the measured potential differences between the at least three body surface potential (BSP) electrodes forming component vectors of the resultant vector; and

g. manipulating the location of at least one of the defibrillation electrodes to increase the amplitude of the resultant vector formed by the measured potential differences between the at least three body surface potential (BSP) electrodes.

2. The method of claim 1, wherein the at least three body surface potential (BSP) electrodes are four body surface potential (BSP) electrodes.

3. The method of claim 1, wherein the at least three body surface potential (BSP) electrodes are supported together on a single pad.

4. The method of claim 2, further including positioning the pad on the patient'"'"'s back below the left scapula.

5. The method of claim 1, wherein the second defibrillation electrode comprises at least one of a housing for an implantable cardio defibrillator and a superior vena cava electrode.

6. The method of claim 1, wherein the potential difference between the RV defibrillation electrode and the second defibrillation electrode is between about 1 to 10 volts.

7. The method of claim 1, wherein the potential difference between the RV defibrillation electrode and the second defibrillation electrode is below the pacing threshold of the patient'"'"'s heart.

8. The method of claim 1, including the step of providing a variable signal proportional to the amplitude of the resultant vector selected from the group consisting of a variable frequency audio signal, a variable color visual signal, and a variable frequency vibration sensory signal.

9. The method of claim 1, wherein the at least one manipulated defibrillation electrode is fixed in the location that provides the relative maximum amplitude of the resultant vector.

10. A method of implanting at least one lead for a cardio defibrillator, comprising:

a. installing a RV defibrillation electrode in a right ventricle of a patient'"'"'s heart;

b. installing a second and a third defibrillation electrode in the patient;

c. attaching at least three body surface potential (BSP) electrodes capable of measuring body surface potential to the patient'"'"'s skin;

d. creating a potential difference between the RV defibrillation electrode and the second defibrillation electrode;

e. measuring the body surface potential at the at least three body surface potential (BSP) electrodes caused by the potential difference between the defibrillation electrodes;

f. determining the amplitude of a resultant vector formed by the measured potential differences between the at least three body surface potential (BSP) electrodes, the measured potential differences between the at least three body surface potential (BSP) electrodes forming component vectors of the resultant vector; and

g. creating a potential difference between the RV defibrillation electrode and the third defibrillation electrode to determine if such potential difference increases the amplitude of the resultant vector formed by the measured potential differences between the at least three body surface potential (BSP) electrodes.

11. The method of claim 10, wherein the at least three body surface potential (BSP) electrodes are four body surface potential (BSP) electrodes arranged in a generally rectangular configuration and supported on a single adhesive pad.

12. The method of claim 11, wherein the component vectors are two component vectors, and the component vectors are formed by subtracting the measured potential of the body surface potential (BSP) electrodes at opposite diagonal corners.

13. The method of claim 12, wherein each component vector is formed by dividing out distance between the body surface potential (BSP) electrodes forming the respective component vector.

14. The method of claim 10, wherein the potential differences created between the defibrillation electrodes are synchronized to an R-wave of the patient'"'"'s heart.

15. The method of claim 10, wherein the potential differences created between the defibrillation electrodes are below the patient'"'"'s pacing threshold.

16. The method of claim 10, wherein the resultant vector amplitude is corrected by applying correction factors based on thoracic circumference and heart size.