Ellipticity Measuring Device
First Claim
1. A catheter for determining the size and shape of a tubular member of the body, said catheter comprising:
- a balloon having a first semi-compliant region and a second region;
said first semi-compliant region having a first span of radiopaque markers comprising a variable ring of radiopaque markers;
said second region having a second span of radiopaque markers expanding to a predetermined size;
said second region having a larger diameter than said first region during inflation of said balloon;
said second span of radiopaque markers being a variable ring of radiopaque markers.
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Accused Products
Abstract
A balloon catheter is used for dilating tubular members of the body such as dilating stenotic aortic valve leaflets found in the aortic root, and measuring the shape and dimensions of the annulus. The balloon has two larger diameter bulbous regions; one is positioned in the left ventricular outflow tract (LVOT) and the other in the aortic sinus; a smaller diameter waist region is positioned across the aortic annulus. During inflation of the balloon, the balloon waist expands in diameter until it comes into contact with the aortic annulus. The balloon pressure and inflation volume is monitored during inflation so that an inflection point in the dP/dV curve is seen at the point of contact of the waist with the annulus. Radiopaque rings and/or marker bands in the device allow the size and orientation of the elliptical annulus to be calculated.
4 Citations
3 Claims
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1. A catheter for determining the size and shape of a tubular member of the body, said catheter comprising:
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a balloon having a first semi-compliant region and a second region; said first semi-compliant region having a first span of radiopaque markers comprising a variable ring of radiopaque markers; said second region having a second span of radiopaque markers expanding to a predetermined size; said second region having a larger diameter than said first region during inflation of said balloon; said second span of radiopaque markers being a variable ring of radiopaque markers.
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2. A catheter for determining the size and shape of a tubular member of the body, said catheter comprising:
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an elongated member; a balloon disposed at a distal end of said elongated member; said balloon having a first region comprising semi-compliant material and a second region comprising non-compliant material; said first region located adjacent to said second region; a first ring of radiopaque markers located around said first region; said first ring of radiopaque markers comprising a first plurality of radiopaque markers that increase in distance from each other along said first region during inflation of said balloon; a fixed span of radiopaque markers located along said elongated member.
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3. A catheter for determining the actual magnification of an image seen on fluoroscopy, said catheter comprising:
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a balloon having a semicompliant waist with an actual waist diameter magnification that is to be determined, said waist having a variable ring of radiopaque markers; said balloon further comprising a first bulb and a second bulb located equidistant axially on each side of said waist; said first bulb being formed from a noncompliant material and having a first fixed ring of radiopaque markers; said second bulb being formed from a noncompliant material and having a second fixed ring or radiopaque markers; wherein said actual waist diameter magnification is determined from an average of a magnification of said first bulb and said second bulb.
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Specification