Surgery – Truss – Pad
Patent
1986-07-14
1988-08-09
Truluck, Dalton L.
Surgery
Truss
Pad
604 96, A61M 2902
Patent
active
047621290
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a dilatation catheter having a tube the operative end of which opens into an expandable balloon and a segment of flexible tubing traversing the balloon, sealingly connected to the distal end of the balloon, and capable of being threaded by a guide wire.
Such a dilatation catheter is described in The American Journal of Cardiology, Vol. 49, Apr. 1, 1982, pages 1216 to 1222, and is employed to enlarge constrictions in vessels and body cavities, in particular coronary arteries. At the tip of such a dilatation catheter, an inflatable balloon is disposed, capable of being filled or emptied by way of a lumen inside the catheter.
In the known dilatation catheter, a tube is provided that passes over into a balloon at its anterior end. Through the interior of the balloon and the tube, in the known dilatation catheter, a flexible tube extends, projecting beyond the anterior end of the balloon and sealingly connected to the anterior end of the balloon. Through the inside of the flexible tube, a guide wire is passed, capable of being displaced relative to the balloon during the operation, so that the dilatation catheter can be advanced or retracted along the guide wire. When replacing a dilatation catheter applied with the aid of a guide catheter, it is necessary that the guide wire protrude from the patient's body by a length greater than the length of the dilatation catheter with tube. For this reason, manipulation of the known dilatation catheter is difficult, especially since the forces of friction between the guide wire and the flexible tubing passing all the way through the balloon and the tube are great.
SUMMARY OF THE INVENTION
Departing from this prior art, the object of the invention is to create a dilatation catheter that can be passed easily along a guide wire and simply and easily replaced by another dilatation catheter.
This object is accomplished, according to the invention, in that the proximal end of the balloon is likewise sealingly attached to the length of flexible tubing, and in that the tube opens into the interior of the balloon laterally displaced from the segment of tubing.
Since the segment of tubing coming into contact with the surface of the guide wire is only about as long as the balloon and the tube no longer encloses the guide wire and the guide tubing enclosing it, manipulation of the dilatation catheter is facilitated. Control is improved because of the absence of frictional forces in a long segment of guide tubing. Furthermore, owing to the comparative shortness of the length of tubing, the guide wire need no longer protrude from the patient's body by about the same length as the length of the dilatation catheter.
Suitable embodiments and refinements of the invention are described elsewhere in the present application.
DETAILED DESCRIPTION OF THE INVENTION
The invention will now be illustrated with reference to the embodiment represented in the drawing by way of example. In the drawing,
FIG. 1 shows the anterior portion of the dilatation catheter according to the invention, with tube opening into the balloon,
FIG. 2 shows a cross section of a dilatation catheter in the region of the tube, passing alongside the guide wire, and
FIG. 3 shows a cross section of the dilatation catheter in the region of a gold marker in the balloon.
In FIG. 1, the anterior portion of a dilatation catheter is represented, to be advanced with the aid of a guide catheter not shown in the drawing, having a diameter of some millimeters and a length of about one meter, for example from a patient's right groin throughout the length of the artery to the aorta and the coronary arteries. Through the guide catheter not shown in the drawing, first a guide wire 1 is advanced into the corresponding coronary. A segment of the guide wire 1, which is about 1 m in length, may be seen in FIG. 1. The guide wire 1 serves as instrumentation track to guide the dilatation catheter.
The dilatation catheter has a balloon tube and a tube 3, shown cut away in FIG. 1 and likewi
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Akers Lawrence C.
Knuth Charles J.
Richardson Peter C.
Truluck Dalton L.
Wilkens Frank
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