Catheter introducer for angiography

• US 4,850,975 A
• Filed: 03/16/1988
• Issued: 07/25/1989
• Est. Priority Date: 03/27/1987
• Status: Expired due to Fees

• Current Assignee: Yuichi Furukawa
• Original Assignee: Yuichi Furukawa
• Inventors: Furukawa, Yuichi
• Primary Examiner(s): Truluck, Dalton L.
• Application Number:
  US07/168,805
• Time in Patent Office: 496 Days
• Field of Search: 604/51-53, 604/168-170, 604/280-283, 604/104, 128/343, 128/658
• US Class Current: 604/170.01
• CPC Class Codes: A61M 25/0662 Guide tubes

Abstract

A catheter introducer for angiography is disclosed which comprises a sheath for inserting and guiding a catheter into a puncture hole in a blood vessel, and a dilator removably inserted through the sheath for receiving an introduction guide wire for the catheter. A front end of the dilator is provided with a forwardly descending conical taper surface for smoothly expanding the puncture hole. A rear end of the dilator is formed with a hub which extends therefrom for preventing the slip-off of the sheath. The sheath has a hollow hub which extends from the rear end thereof. The hub is connected for communication to a medical liquid injecting tube which is equipped with an on-off valve for injecting a heparin-containing physiological salin solution or other medical liquids for preventing blood coagulation. The outer diameter of a portion of the dilator subsequent to a forwardly descending taper surface is greater than the inner diameter of the sheath. A slit for contracting the outer diameter is cut in the dilator to extend longitudinally along the dilator in the form of a line segment of a given length such that an opening front end of the dilator is positioned on the forwardly descending taper surface and an opening rear end of the dilator is limited from reaching a sheath slip-off preventing hub of the dilator. The dilator is inserted through the sheath while being forcibly contracted to cause the slit to close. The dilator is intimately contacted with the inner wall surface of the sheath.

Claims

1. A catheter introducer for angiography, comprising:

a sheath for inserting and guiding a catheter into a puncture hole in a blood vessel; and

a dilator removably inserted through said sheath for receiving an introduction guide wire for the catheter,

wherein the front end of said dilator being provided with a forwardly descending conical taper surface for smoothly expanding the puncture hole, wherein a rear end of said dilator being formed with a hub extending therefrom for preventing the slip-off of the sheath,

wherein said sheath having a hollow hub extending from the rear end thereof, wherein said hub being connected for communication to a medical liquid injecting tube which is equipped with an on-off valve for injecting a solution selected from the group consisting of heparin-containing physiological saline solution and other medical liquids to prevent blood coagulation,

wherein the outer diameter of a portion of said dilator subsequent to said forwardly descending taper surface is greater than the inner diameter of the sheath,

wherein a slit for contracting said outer diameter is cut in said dilator to extend longitudinally along said dilator in the form of a line segment of a given length such that an opening front end of said dilator is positioned on the forwardly descending taper surface and an opening rear end of said dilator is limited from reaching a sheath slip-off preventing hub of said dilator, and

wherein said dilator being inserted through the sheath while being forcibly contracted to cause said slit to close, and wherein the dilator is intimately contacted with the inner wall surface of the sheath.

2. A catheter introducer for angiography as set forth in claim 1, wherein the outer diameter of the dilator is increased at an intermediate portion thereof so that it is greater than the inner diameter of the sheath.

3. A catheter introducer for angiography as set forth in claim 1, wherein the dilator is formed with a forwardly descending conical taper surface and the opening front end of the slit is positioned on said conical taper surface.