Medical guide element with diameter transition
OwnerJeffrey Grayzel, Joseph Grayzelinventors
Life of this patent
Estimating the term…
Abstract
Improved methods for percutaneously creating, entering and/or dilating an opening in the wall of a blood vessel or other anatomic structure. The improvement comprises deploying a guide element having a proximal segment and a distal segment, the diameter of said distal segment being greater than the diameter of said proximal segment at their juncture, and which at said juncture forms an abrupt circumferential step comprising a proximally-facing surface. Said proximally-facing surface abuts the catheter's tip and shields said tip, thereby facilitating passage of said catheter as it enters and passes through said opening in said wall of a blood vessel or other anatomic structure.
Claims25
1-52. (canceled)
In a method for percutaneously creating and dilating an opening in the wall of a blood vessel or other anatomic structure, wherein a pointed hollow tubular device is used to create an opening into said wall, a guide element is inserted through said tubular device into said opening, said tubular device is removed over said guide element, and a dilating catheter is advanced over said guide element to dilate said opening, the improvement comprising:
- deploying a guide element having a proximal segment and a distal segment which meet at a juncture, said proximal segment having a first outer diameter at said juncture and said distal segment having a second outer diameter at said juncture greater than said first outer diameter, thereby forming an abrupt, circumferential step comprising a proximally facing surface, such that said circumferential step creates a discrete transition between said proximal segment and said distal segment, wherein said circumferential step is positioned outside said wall as said tubular device is removed;
- and
- advancing said dilating catheter distally along said proximal segment of said guide element until the distal tip of said dilating catheter abuts said circumferential step.
A method for percutaneously creating and dilating an opening in the wall of a blood vessel or other anatomic structure comprising:
- employing a pointed hollow tubular device to create an opening into said wall,
- inserting a guide element through said tubular device and through said opening, said guide element having a proximal segment and a distal segment which meet at a juncture, said proximal segment having a first outer diameter at said juncture and said distal segment having a second outer diameter at said juncture greater than said first outer diameter, thereby forming an abrupt circumferential step comprising a proximally-facing surface such that said circumferential step creates a discrete transition between said proximal segment and said distal segment;
- removing said tubular device over said guide element;
- passing a dilating catheter over said guide element and advancing said dilating catheter distally along said proximal segment of said guide element until the distal tip of said dilating catheter abuts said circumferential step such that they can be advanced together in an abutting position;
- advancing said guide element and said dilating catheter in said abutting position until said dilating catheter tip passes through said opening;
- and
- further advancing said dilating catheter to dilate said opening until the main body of said dilating catheter is within said opening.
A method for dilating an opening in the wall of a blood vessel or other anatomic structure comprising:
- inserting a guide element through said opening, said guide element having a proximal segment and a distal segment which meet at a juncture, said proximal segment having a first outer diameter at said juncture and said distal segment having a second outer diameter at said juncture greater than said first outer diameter, thereby forming an abrupt circumferential step comprising a proximally-facing surface such that said circumferential step creates a discrete transition between said proximal segment and said distal segment;
- passing a dilating catheter over said guide element and advancing said dilating catheter distally along said proximal segment of said guide element until the distal tip of said dilating catheter abuts said circumferential step such that they can be advanced together in an abutting position;
- advancing said guide element and said dilating catheter in said abutting position until said dilating catheter tip passes through said opening;
- and
- further advancing said dilating catheter to dilate said opening until the main body of said dilating catheter is within said opening.
A method for percutaneously creating and entering an opening in the wall of a blood vessel or other anatomic structure comprising:
- employing a pointed hollow tubular device to create an opening into said wall;
- inserting a guide element through said tubular device and through said opening, said guide element having a proximal segment and a distal segment which meet at a juncture, said proximal segment having a first outer diameter at said juncture and said distal segment having a second outer diameter at said juncture greater than said first outer diameter, thereby forming an abrupt circumferential step comprising a proximally-facing surface such that said circumferential step creates a discrete transition between said proximal segment and said distal segment;
- removing said tubular device over said guide element;
- passing a catheter over said guide element and advancing said catheter distally along said proximal segment of said guide element until the distal tip of said catheter abuts said circumferential step such that they can be advanced together in an abutting position;
- and
- advancing said guide element and said catheter in said abutting position until said catheter tip passes through said opening.
Dependencies are inferred from the claim text.