JPH08187286A - Intravascular indwelling needle with separate take out opening for inner tube - Google Patents

Abstract

PURPOSE: To provide an indwelling needle with reduced chances to be contaminated by blood backflow when an inner tube is taken out, by installing an output route separate from an outer tube and forming a configuration to prevent the backflow of blood, etc., in the take out route of the inner tube. CONSTITUTION: This intravascular indwelling needle comprises a route 2 into which an inner tube is inserted and another route 4 into which an outer tube is inserted. The route 2 and the route 4 are joined. The route 2 has a valve-like structure to close the route 2 when the inner tube 1 is taken out, but the valve- like structure 5 is not necessarily to be a valve, and it is also allowed to be an elastic body such as rubber to close the route 2 when the inner tube 1 is taken out. This structure is formed at a branch part from the route 4 so as not to collect air and preferably has a shape without stagnating the transfusion liquid.

Description

Detailed Description of the Invention

[Industrial field of use] The present invention is used for securing blood vessels in the medical field.

[Prior Art] A conventional cathelan needle has a structure in which a drip or the like is connected to an outer cylinder after the inner cylinder is removed, and blood may flow backward from the blood vessel when the inner cylinder is removed. , Those who stabbed the needle also had many opportunities to be contaminated with blood.

[Problems to be solved by the present invention] When the inner cylinder is pulled out, it is difficult for blood to flow backward and the chance of contamination is reduced.

[Means for Solving the Problem] The route for removing the inner cylinder is separated from the route for the outer cylinder for connecting the drip or the like, and the route for removing the inner cylinder is provided with a structure in which blood or the like is less likely to come out.

[Operation] By using this indwelling needle in the blood vessel, backflow of blood is prevented.

[Embodiment] As shown in FIG. 1, an indwelling needle for a blood vessel is composed of a route 2 into which an inner cylinder 1 enters and a route 4 into which an outer cylinder 3 enters. Route 2 and route 4 merge. The route 2 has a valve-like structure 5 for closing the route 2 when the inner cylinder 1 is removed.
Need not be a valve, but may be an elastic body such as rubber that closes the route 2 when the inner cylinder 1 is removed.
This structure is located at the branch with the route 4 so that air does not collect on the route 2, and its shape is preferably such that the flow of the infusion does not stagnant as shown in the figure. When it is an elastic body, in order to reduce the possibility that it will adhere to the inner cylinder due to its deterioration, at least the elastic body part of the inner cylinder uses a material that does not easily adhere, or coats the inner cylinder with a material that does not easily adhere, or Furthermore, it is preferable to interpose a lubricant such as olive oil between the two. Further, when the inner cylinder 1 is pulled out, it may have a structure for absorbing blood or the like attached to the inner cylinder 1 itself. The absorbing structure is preferably placed in combination with the valve-like structure 5. The absorbing structure may be an absorber having a certain thickness.

[Advantages of the Invention] By using the present invention, blood vessels can be secured while reducing the chance of blood contamination due to blood reflux.

[Brief description of drawings]

FIG. 1 is a sectional view of the present invention.

[Description of sign]

 1 is an inner cylinder, 2 is a root, 3 is an outer cylinder, 4 is a root, 5 is a valve-like structure,

Claims (3)

[Claims] 1. An indwelling needle for a blood vessel comprising an inner cylinder and an outer cylinder, wherein a take-out route for the inner cylinder is provided separately from the outer cylinder,
The inner tube take-out route has a structure that prevents blood and the like from flowing backward, that is, a valve-like structure or a structure in which the take-out port closes when the inner cylinder is pulled out. A valve-like structure or a structure that closes is located near the bifurcation between the extraction route and the outer cylinder so that air does not accumulate in the extraction route and enter the blood vessel. Good shape to prevent stagnation. The closing structure may be an elastic body such as rubber, but at this time, the elastic body is
It is preferable that it does not easily deteriorate. In addition, even if deterioration occurs, the elastic body does not easily adhere to the inner cylinder of this part or the whole, or the inner cylinder may be coated. 2. A construction similar to that of claim 1, but in which a lubricating oil is interposed between the elastic body and the inner cylinder of the portion having a structure to be closed. 3. The same structure as claim 1 or 2, but further
The removal route of the inner cylinder has a structure that absorbs blood and the like attached to the inner cylinder when the inner cylinder is pulled out.