Method of ligating hollow anatomical structures

Abstract

A catheter includes a plurality of expandable primary leads to deliver energy to a fallopian tube, a vein such as a hemorrhoid or an esophageal varix, or another hollow anatomical structure requiring ligation or occlusion. Each of the primary leads includes an electrode located at the working end of the catheter. Separation is maintained between the primary leads such that the leads can receive power of selected polarity. The primary leads are constructed to expand outwardly to place the electrodes into apposition with a hollow anatomical structure. High frequency energy can be applied from the leads to create a heating effect in the surrounding tissue of the anatomical structure. The diameter of the hollow anatomical structure is reduced by the heating effect, and the electrodes of the primary leads are moved closer to one another.

What is claimed is:  
     
         1 . A method of applying energy intraluminally to a fallopian tube from a power source, the method comprising the steps of: 
 introducing into the fallopian tube a catheter having a working end with a plurality of expandable primary leads disposed at the working end, each primary lead having a distal end and being connected to the power source;    expanding the primary leads outwardly from the working end of the catheter, wherein the distal ends of the primary leads move away from each other and into contact with the wall of the fallopian tube; and    applying energy to the fallopian tube from the distal end of the primary leads to collapse and effectively occlude the fallopian tube.    
     
     
         2 . The method of  claim 1  further comprising the step of moving a sheath and the plurality of expandable primary leads in relation to each other to selectively expand the primary leads outwardly or contract the primary leads.  
     
     
         3 . The method of  claim 1  wherein the step of introducing a catheter into the fallopian tube comprises the step of introducing a plurality of expandable primary leads that are mounted to the working end in a cantilever arrangement.  
     
     
         4 . The method of  claim 3  further comprising the step of moving a sheath away from the cantilevered expandable primary leads such that the primary leads extend past an orifice of the sheath at the working end of the catheter and expand outwardly.  
     
     
         5 . The method of  claim 1  further comprising the step of moving the catheter in the fallopian tube during the step of applying energy to the fallopian tube.  
     
     
         6 . The method of  claim 5  further comprising the step of compressing the fallopian tube to reduce the fallopian tube to a desired size during the step of applying energy to the fallopian tube.  
     
     
         7 . The method of  claim 1  wherein the step of introducing a catheter into the fallopian tube comprises introducing a catheter also having a secondary lead mounted at the working end, the secondary lead having a distal end and having a length exceeding that of the primary leads; and 
 wherein the step of extending the plurality of primary leads further includes the step of extending the secondary lead through the distal orifice.  
 
     
     
         8 . The method of  claim 1  wherein the step of applying energy to the fallopian tube comprises the steps of: 
 controlling the power source so that adjacent primary leads are of opposite polarity while maintaining the secondary lead so that it is electrically neutral;  
 switching the polarity of the primary leads so that they are all of the same polarity upon collapse of the fallopian tube around the primary leads; and  
 controlling the power source so that the secondary lead is of opposite polarity relative to the primary leads upon performing the step of switching the polarity of the primary leads so that they are of the same polarity.  
 
     
     
         9 . The method of  claim 1  wherein the step of introducing a catheter into the fallopian tube comprises introducing a catheter also having an outward bend formed in each primary lead, the bend formed in the direction away from the other primary leads such that each primary lead tends to move outward away from the other primary leads in the step of expanding the primary leads.  
     
     
         10 . The method of  claim 1  further comprising the steps of: 
 sensing the temperature at a primary lead;  
 controlling the application of power to the primary lead in response to the temperature sensed at the lead.  
 
     
     
         11 . The method of  claim 1  further comprising the step of flushing the fallopian tube with fluid before the step of applying energy.  
     
     
         12 . The method of  claim 1  further comprising the step of compressing the fallopian tube during the step of applying energy.  
     
     
         13 . The method of  claim 12  wherein the step of compressing the fallopian tube comprises the step of applying negative pressure to the fallopian tube.  
     
     
         14 . The method of  claim 12  wherein the step of compressing the fallopian tube comprises the step of creating a pneumoperitoneum.  
     
     
         15 . The method of  claim 1  further comprising the step of compressing the fallopian tube to a desired size before and during the step of applying energy.  
     
     
         16 . A method of applying energy intraluminally to a hemorrhoid from a power source, the method comprising the steps of: 
 introducing into the hemorrhoid a catheter having a working end with a plurality of expandable primary leads disposed at the working end, each expandable primary lead having a distal end and being connected to the power source;    expanding the primary leads outwardly from the working end of the catheter, wherein the distal ends of the primary leads move away from each other and into contact with the wall of the hemorrhoid; and    applying energy to the hemorrhoid from the distal end of the primary leads to collapse the hemorrhoid to effectively occlude the hemorrhoid.    
     
     
         17 . The method of  claim 16  further comprising the step of moving a sheath and the plurality of expandable primary leads in relation to each other to selectively expand the primary leads outwardly or contract the primary leads.  
     
     
         18 . The method of  claim 16  wherein the step of introducing a catheter into the hemorrhoid comprises the step of introducing a plurality of expandable primary leads that are mounted to the working end in a cantilever arrangement.  
     
     
         19 . The method of  claim 18  further comprising the step of moving a sheath away from the cantilevered expandable primary leads such that the primary leads extend past an orifice of the sheath at the working end of the catheter and expand outwardly.  
     
     
         20 . The method of  claim 16  further comprising the step of moving the catheter in the hemorrhoid while continuing to apply energy to the hemorrhoid.  
     
     
         21 . The method of  claim 20  further comprising the step of compressing the hemorrhoid during the step of applying energy.  
     
     
         22 . The method of  claim 16  wherein the step of introducing a catheter into the hemorrhoid comprises introducing a catheter also having a secondary lead mounted at the working end, the secondary lead having a distal end and having a length exceeding that of the primary leads; and 
 wherein the step of extending the plurality of primary leads further includes the step of extending the secondary lead through the distal orifice.  
 
     
     
         23 . The method of  claim 16  wherein the step of applying energy to the hemorrhoid comprises the steps of: 
 controlling the power source so that adjacent primary leads are of opposite polarity while maintaining the secondary lead so that it is electrically neutral;  
 switching the polarity of the primary leads so that they are all of the same polarity upon collapse of the hemorrhoid around the primary leads; and  
 controlling the power source so that the secondary lead is of opposite polarity relative to the primary leads upon performing the step of switching the polarity of the primary leads so that they are of the same polarity.  
 
     
     
         24 . The method of  claim 16  wherein the step of introducing a catheter into the hemorrhoid comprises introducing a catheter also having an outward bend formed in each primary lead, the bend formed in the direction away from the other primary leads such that each primary lead tends to move outward away from the other primary leads in the step of expanding the primary leads.  
     
     
         25 . The method of  claim 16  further comprising the steps of: 
 sensing the temperature at a primary lead;  
 controlling the application of power to the primary lead in response to the temperature sensed at the lead.  
 
     
     
         26 . The method of  claim 16  further comprising the step of flushing the hemorrhoid with fluid before the step of applying energy.  
     
     
         27 . The method of  claim 16  further comprising the step of compressing the hemorrhoid to a desired size before and during the step of applying energy.  
     
     
         28 . The method of  claim 27  wherein the step of compressing the hemorrhoid comprises the step of applying negative pressure to the hemorrhoid.  
     
     
         29 . The method of  claim 16  further comprising the step of exsanguinating the hemorrhoid before and during the step of applying energy.  
     
     
         30 . The method of  claim 29  wherein the step of exsanguinating the hollow anatomical structure comprises the step of delivering fluid to displace blood from the hemorrhoid.  
     
     
         31 . A method of applying energy intraluminally to an esophageal varix from a power source, the method comprising the steps of: 
 introducing into the esophageal varix a catheter having a working end with a plurality of primary leads disposed at the working end, each primary lead having a distal end and being connected to the power source;    expanding the primary leads outwardly from the working end of the catheter, wherein the distal ends of the primary leads move away from each other and into contact with the wall of the esophageal varix; and    applying energy to the esophageal varix from the distal end of the primary leads to collapse the esophageal varix to effectively occlude the esophageal varix.    
     
     
         32 . The method of  claim 31  further comprising the step of moving a sheath and the plurality of expandable primary leads in relation to each other to selectively expand the primary leads outwardly or contract the primary leads.  
     
     
         33 . The method of  claim 31  wherein the step of introducing a catheter into the esophageal varix comprises the step of introducing a plurality of expandable primary leads that are mounted to the working end in a cantilever arrangement.  
     
     
         34 . The method of  claim 33  further comprising the step of moving a sheath away from the cantilevered expandable primary leads such that the primary leads extend past an orifice of the sheath at the working end of the catheter and expand outwardly.  
     
     
         35 . The method of  claim 31  further comprising the step of moving the catheter in the esophageal varix while continuing to apply energy to the esophageal varix.  
     
     
         36 . The method of  claim 31  further comprising the step of compressing the esophageal varix during the step of applying energy.  
     
     
         37 . The method of  claim 31  wherein the step of introducing a catheter into the esophageal varix comprises introducing a catheter also having a secondary lead mounted at the working end, the secondary lead having a distal end and having a length exceeding that of the primary leads; and 
 wherein the step of extending the plurality of primary leads further includes the step of extending the secondary lead through the distal orifice.  
 
     
     
         38 . The method of  claim 31  wherein the step of applying energy to the esophageal varix comprises the steps of: 
 controlling the power source so that adjacent primary leads are of opposite polarity while maintaining the secondary lead so that it is electrically neutral;  
 switching the polarity of the primary leads so that they are all of the same polarity upon collapse of the esophageal varix around the primary leads; and  
 controlling the power source so that the secondary lead is of opposite polarity relative to the primary leads upon performing the step of switching the polarity of the primary leads so that they are of the same polarity.  
 
     
     
         39 . The method of  claim 31  wherein the step of introducing a catheter into the esophageal varix comprises introducing a catheter also having an outward bend formed in each primary lead, the bend formed in the direction away from the other primary leads such that each primary lead tends to move outward away from the other primary leads in the step of expanding the primary leads.  
     
     
         40 . The method of  claim 31  further comprising the steps of: 
 sensing the temperature at a primary lead;  
 controlling the application of power to the primary lead in response to the temperature sensed at the lead.  
 
     
     
         41 . The method of  claim 31  further comprising the step of flushing the esophageal varix with fluid before the step of applying energy.  
     
     
         42 . The method of  claim 31  further comprising the step of compressing the esophageal varix to a desired size before the step of applying energy.  
     
     
         43 . The method of  claim 42  wherein the step of compressing the esophageal varix comprises the step of applying negative pressure to the esophageal varix.  
     
     
         44 . The method of  claim 42  wherein the step of compressing the esophageal varix comprises the step of applying pressure external to the esophageal varix from within the esophagus.  
     
     
         45 . The method of  claim 31  further comprising the step of exsanguinating the esophageal varix before and during the step of applying energy.  
     
     
         46 . The method of  claim 45  wherein the step of exsanguinating the hollow anatomical structure comprises the step of delivering fluid to displace blood from the esophageal varix.