Surgery – Instruments – Internal pressure applicator
Patent
1989-06-22
1990-09-11
Yu, Mickey
Surgery
Instruments
Internal pressure applicator
604 96, 604102, 604104, 606191, 606194, A61M 2900
Patent
active
049558951
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
1. Technical Field:
This invention relates to a vasodilating catheter. More particularly, this invention relates to a vasodilating catheter for curatively dilating a stenosis in a blood vessel and improving the flow of blood on the peripheral blood vessel.
2. Background Art:
When a stenosis or an obstruction occurs in a vessel such as the blood vessel, a suitable form of angioplasty (such as percutaneous transluminal angioplasty [PTA]or percutaneous transluminal coronary angioplasty [PTCA]) is performed for the purpose of widening the stenotic site or reopening the obstructed site cf the vessel and improving the flow of body fluid on the peripheral vessel. The angioplasty is effected, for example, by first securing percutaneously the blood vessel in trouble, inserting a thin guide wire into the vessel, allowing a catheter provided at the leading end thereof with a balloon to be inserted into the vessel as led by the guide wire, locating the balloon at the point of stenosis or obstruction, and subsequently injection a liquid (such as, for example, an contrast medium or physiological saline solution) through a terminal hub into the balloon under application of pressure (on the order of several to 10 atmospheres) thereby inflating the balloon toward and against the inner wall of the vessel and consequently expanding the stenotic or obstructed site of the vessel with pressure.
The vasodilating catheters heretofore used for various forms of angioplasty fall mainly under the GRUNTZIG type and the Simpson-Robert type. The catheters of the GRUNTZIG type have a general construction which comprises a catheter tube possessed of two tubular cavities and provided near the leading end thereof with a balloon and adapts one of the two tubular cavities to open at the leading end thereof and form a passage for a guide wire and for measurement of the leading end pressure and the other tubular cavity to communicate with the balloon at the basal side of the balloon and form a flow path for pressure injection such as of a contrast medium intended for the inflation of the balloon. The catheters of the Simpson-Robert type share a coaxial double-flow construction which comprises an inner tube opening at the leading end thereof and forming a first flow path, an outer tube encircling the inner tube, defining a second flow path jointly with the inner tube, and continuing at the leading end thereof into a balloon, and very thin metallic pipe adapted for removal of bubbles and disposed inside the second flow path. The catheters of this type, therefore, are put to use in the angioplasty after the contrast medium has been injected into the balloon through the second flow path and the residual air removed through the metallic pipe.
The catheters of the GRUNTZIG type, however, have disadvantage that the bubbles which survive inside the balloon when the balloon in inflated by pressure injection of the contrast medium necessitate a complicated work for their removal and even defy all efforts to effect their thorough removal and, as the result, the opacifying property of the balloon is degraded so much as to render difficult perfect recognition of the position and shape of the inflated balloon and impede perfect executing of the angioplasty. Worse still, owing to the configuration of the catheter tube which requires incorporation of the two tubular cavities, the catheter is devoid of flexibility and is liable to injure the inner wall of the blood vessel which normally abounds with bends.
The catheters of the Simpson-Robert type likewise have a disadvantage that owing to the metallic pipes used for the removal of bubbles, the catheter is devoid of flexibility and, similarly to the catheters of the GRUNTZIG type, is liable to injure the inner wall of the blood vessel abounding with bends and the metallic pipe itself is apt to pierce the catheter.
An object of this invention is to provide a novel vasodilating catheter. Another object of this invention is to provide a vasodilating catheter which permits easy removal of entrapped air
REFERENCES:
patent: 4195637 (1980-04-01), Gruntzig et al.
patent: 4323071 (1982-04-01), Simpson et al.
patent: 4819751 (1989-04-01), Shimada et al.
Sagae Kyuta
Sugiyama Yoshiaki
Cicconi Beth Anne
Terumo Kabushiki Kaisha
Yu Mickey
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