The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 17, 1992
Filed:
Jul. 29, 1991
James F Crittenden, Hollis, NH (US);
George J Purtell, Dracut, MA (US);
C. R. Bard, Inc., Murray Hill, NJ (US);
Abstract
A small diameter balloon dilatation catheter having a shaft formed from hypodermic tubing is provided with a detachable luer fitting on its proximal end. The luer fitting may be removed and an extension wire attached to the proximal end of the catheter. A larger diameter catheter then may be advanced over the smaller catheter utilizing the smaller catheter to guide the larger catheter to the stenosis being treated. In another aspect of the invention, a guiding sheath assembly is provided which permits catheter exchanges involving such small diameter catheters having integral guidewires. In one protocol such a catheter may be exchanged for a conventional balloon dilatation catheter with a movable guidewire by removing the dilatation catheter, advancing the sheath over the guidewire, then removing the guidewire and inserting the replacement catheter. Similarly, a catheter having an integral guidewire may be exchanged for a similar catheter by first removing the luer fitting at the proximal end of the catheter, then attaching a wire extension to the proximal end of the catheter, then advancing a sheath over the extension and catheter to locate the distal end of the sheath in proximity to the stenosis, then removing the catheter through the sheath and replacing that catheter with a new catheter inserted through the sheath.