Catheter with valve
View Patent ↗A catheter with a valve is disclosed that allows smooth flow of a solution in-both when a solution is flowing from the inside of a catheter towards the outside of a catheter and when a solution is flowing from the outside of a catheter towards the inside of a catheter. The catheter includes a tubular body 12 made of an elastic and flexible synthetic resin material and is equipped with a valve having a slit 16 passing through the outer surface 12 b of the tubular body. The catheter is also provided with the movable wall 15 sunken towards the inside of the tubular body 12 at an end tip member region 14 of the tubular body 12 . The location where the movable wall 15 exists has a structure with differences in hardness in the thickness direction of the tubular body 12.
1. A catheter having a tubular body formed from an elastic and flexible synthetic resin material and being equipped with a valve having a slit that can be opened and closed, the slit passing through an outer surface of the tubular body from an inner surface of the tubular body,
the catheter being characterized by allowing passage of a solution from the inside of the tubular body towards the outside of the tubular body through the slit and passage of a solution from the outside of the tubular body towards the inside of the tubular body through the slit,
the catheter being provided with a movable wall sunken towards the inside of the tubular body at a tip of the tubular body, at least the movable wall having differences in hardness in the thickness direction of the tubular body, and in the cross-sectional surface perpendicular to the center axis of the tubular body, the movable wall having a wall central portion located at a position close to the center axis and a wall tip member located at a position far from the center axis along with the slit comprising the valve being formed on the wall tip member.
2. The catheter with a valve as set forth in claim 1 , wherein the tubular body is a two-layer structure comprising an outer layer of a relatively hard synthetic resin material and an inner layer of a relatively soft synthetic resin material.
3. The catheter with a valve as set forth in claim 1 , wherein the tubular body is a two-layer structure comprising an outer layer of a relatively soft synthetic resin material and an inner layer of a relatively hard synthetic resin material.
4. The catheter with a valve as set forth in claim 2 , wherein the outer layer and the inner layer are formed using the same type of synthetic resin material with a different hardness.
5. The catheter with a valve as set forth in claim 3 , wherein the outer layer and the inner layer are formed using the same type of synthetic resin material with a different hardness.