Small gauge needle catheterization apparatus
First Claim
1. An apparatus for percutaneous catheterization over a wire guide, comprising:
- a catheter having proximal and distal open ends, and having a lumen extending longitudinally therethrough;
an inner cannula having proximal and distal open ends, and having a lumen extending longitudinally therethrough, said inner cannula sized to be received within the lumen of said catheter, the distal open end of said inner cannula being sized to receive said wire guide therethrough, said inner cannula having a generally linear main body portion and a tapered distal portion, said tapered distal portion having an outer diameter that decreases toward the cannula distal end and is sized to extend through the distal open end of said catheter to provide a generally smooth diametrical transition between said catheter and said wire guide; and
a stiffening cannula having proximal and distal open ends, and having a lumen extending longitudinally therethrough, the lumen of said stiffening cannula sized to receive said wire guide therethrough, said stiffening cannula being sized to be received within the lumen of said inner cannula and extending along the generally linear body portion of the inner cannula to a terminal point, the stiffening catheter having a distal section of greater flexibility than the flexibility of a proximal section of said stiffening catheter.
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Accused Products
Abstract
An apparatus for percutaneous catheterization. The apparatus comprises a catheter, and an inner cannula received within the lumen of the catheter. The inner cannula has a distal portion that tapers toward the distal end, and is sized to extend through the distal opening of the catheter to provide a generally smooth diametrical transition between the distal end of the catheter and the distal open end of the inner cannula. A stiffening cannula is sized to be received in the lumen of the inner catheter, and has an inner diameter sized to receive a wire guide therethrough. The stiffening cannula as a distal section of greater flexibility than the flexibility of a proximal section for providing kink resistance to the apparatus.
133 Citations
20 Claims
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1. An apparatus for percutaneous catheterization over a wire guide, comprising:
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a catheter having proximal and distal open ends, and having a lumen extending longitudinally therethrough;
an inner cannula having proximal and distal open ends, and having a lumen extending longitudinally therethrough, said inner cannula sized to be received within the lumen of said catheter, the distal open end of said inner cannula being sized to receive said wire guide therethrough, said inner cannula having a generally linear main body portion and a tapered distal portion, said tapered distal portion having an outer diameter that decreases toward the cannula distal end and is sized to extend through the distal open end of said catheter to provide a generally smooth diametrical transition between said catheter and said wire guide; and
a stiffening cannula having proximal and distal open ends, and having a lumen extending longitudinally therethrough, the lumen of said stiffening cannula sized to receive said wire guide therethrough, said stiffening cannula being sized to be received within the lumen of said inner cannula and extending along the generally linear body portion of the inner cannula to a terminal point, the stiffening catheter having a distal section of greater flexibility than the flexibility of a proximal section of said stiffening catheter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An apparatus for percutaneous catheterization, comprising:
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a catheter having proximal and distal open ends, and having a lumen extending longitudinally therethrough;
an inner cannula having proximal and distal open ends, and having a lumen extending longitudinally therethrough, said inner cannula sized to be received within the lumen of said catheter, the distal open end of said inner cannula being sized to receive a wire guide therethrough, said inner cannula having a generally linear main body portion and a tapered distal portion, said tapered distal portion having an outer diameter that decreases toward the cannula distal end and is sized to extend through the distal open end of said catheter to provide a generally smooth diametrical transition between said catheter and said wire guide;
a stiffening cannula having proximal and distal open ends, and having a lumen extending longitudinally therethrough, said stiffening cannula being sized to be received within the lumen of said inner catheter; and
an inner sleeve having proximal and distal open ends, and having a lumen extending longitudinally therethrough, the lumen of said inner sleeve sized to receive said wire guide therethrough, said inner sleeve being sized to be received within the lumen of said stiffening cannula, said inner sleeve distal end extending substantially to said distal opening of said inner cannula. - View Dependent Claims (14, 15, 16, 17)
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18. A method of percutaneous catheterization, comprising the steps of:
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introducing a wire guide into a vessel;
providing a catheterization apparatus, said apparatus comprising;
a catheter having a lumen extending longitudinally therethrough and having a distal end;
an inner cannula having a lumen extending longitudinally therethrough, said inner cannula sized to be received within the lumen of said catheter, a distal end of said inner cannula tapering to a diameter just large enough to enable said wire guide to pass freely therethrough, said tapered distal end providing a generally smooth diametrical transition between said catheter and said wire guide; and
a stiffening cannula having a lumen extending longitudinally therethrough, the lumen of said stiffening cannula sized to receive said wire guide therethrough, said stiffening cannula being sized to be received within the lumen of said inner catheter, the stiffening catheter having a distal section of greater flexibility than the flexibility of a proximal section;
introducing said apparatus into said vessel over said wire guide; and
withdrawing said wire guide, inner cannula and stiffening cannula from said vessel, while maintaining said catheter in said vessel. - View Dependent Claims (19, 20)
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Specification