JPH02102667A - Dividable plastic detaining needle - Google Patents

Abstract

PURPOSE:To easily execute division, to enough resist against the insertion of a syringe chip and to attain the sticking of detaining of a needle into a blood vessel without trouble by providing a folding type handle or a engaging type divider in the base edge part side of a connecting part which is linked to a shaft part. CONSTITUTION:A shaft part 1 is provided by using polypropylene, for example, a linear weak part 4 is provided by using a material, for which barium sulfate is added to the polypropylene by the 80% of the weight, over the whole length of a shaft. A connecting part 2 is formed by the same plastic material as the shaft part and can be formed even in a cylindrical shape, for example. Then, the connecting part can be also formed in a funnel shape, whose diameter is enlarged to a base part side. Preferably, plural tearing-up parts 5 are provided in positions to correspond to the shaft part in this connection part as well samely as the shaft part. For the molding method of the tearing-up part, it is available to add the brium sulfate, etc., samely as the shaft part or to execute working for a V-notch, etc. A folding type handle 3 is unitedly linked and provided in the base part side of the connecting part. Otherwise, an engaging type divider 6 is provided in a base part side 2' of a connecting part 2.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a plastic indwelling needle used as a medical device, and more specifically to a plastic indwelling needle that is easily splittable for introducing a catheter into a blood vessel. be.

(Prior Art and Problems) The present invention relates to a cannula-type indwelling needle that is easily split and is used as a medical device. This invention relates to the improvement of an indwelling needle.

In general, this type of indwelling needle consists of a shaft portion that serves as a puncture portion with an extremely thin tip, and a connecting portion that is inserted into and held in a metal injection cannula. These are molded from a synthetic resin material such as polypropylene, and then fused or glued together to continuously inject a medicinal solution into the body's vascular system.
The distal end of the shaft is inserted into the body's vascular system together with the injection cannula, and after the injection cannula is pulled out and removed, the opening on the connection side is used as an introduction port and used as an auxiliary tool for inserting and indwelling a catheter. has been done.

However, conventionally, such indwelling needles are removed from the body once the catheter is inserted and are no longer used; however, because they are cylindrical, they cannot be removed from the catheter. It is left as is. For this reason, in order to stabilize the catheter after insertion, it may get in the way when fixed to the body with tape, etc., or it may be extremely troublesome and uncomfortable for the patient if the catheter is left unpunctured for a long time. Not only that, but even if the shaft is removed, the tip of the shaft after removal is contaminated with blood, etc., making it easy for bacteria to grow in this area.
It was also a cause of infection.

In addition, as a means to compensate for the above-mentioned drawbacks, conventionally, a plurality of V-shaped cross-sectional grooves, slits, or perforations are formed along the axial direction of the shaft portion constituting the indwelling needle to make it divisible. , there are well-known devices that have been devised so that they can be removed.

Further, regarding the method of forming a linear weakened portion along the axial direction of the shaft portion, there are methods such as those found in, for example, Japanese Unexamined Patent Publications No. 5991967 and Japanese Unexamined Patent Publication No. 62-79070. There is also a method in which the shaft part and the connecting part are not molded separately, but are molded together. In that case, press the connecting part with your fingers to break it, and then manually move the divided connecting part to the left and right sides. There is a type that can be grasped and split, but such a type is useful when checking the Franchback of blood to see if the plastic indwelling needle is securely placed in the blood vessel, or when the indwelling needle is In the case of blood collection, which is often performed through a syringe, in order to connect the syringe, the tip of the syringe must be pushed into a connection part that is molded integrally with the shaft and has a large diameter. The tube may crack along the edges, causing air to be sucked in when suctioning or causing leaks when injecting. Also, attach the edge of the connection part to a heat shrink tube T as shown in Figure 5.
Some have been strengthened using

In other words, it is extremely difficult to satisfy the contradictory conditions of lowering the splitting resistance to such an extent that it can be easily broken by hand, and yet resisting insertion of the syringe tip.

Another method, as shown in Fig. 6, is to mold the indwelling needle shaft and the connecting part separately, form a large handle 7 on the connecting part, hold this handle in both hands, and use the principle of lever to hold it. There is a method of dividing the shaft portion 1 along the weakened filament 5 attached thereto and then dividing the shaft portion 1 integrally joined thereto. Note that 5 has a V-notch shape. However, the problem with this case is that when the plastic indwelling needle is placed in a blood vessel, the handle comes into contact with the body surface and gets in the way depending on the angle of puncturing.

In addition, generally, in order to securely indwell a plastic indwelling needle in a blood vessel, the shaft portion of the plastic indwelling needle is held and pushed forward while being rotated with the fingers, but the bulky handle also becomes a hindrance to the operation at this time.

(Purpose of the Invention) As a result of intensive research to solve these problems, the inventors of the present invention have developed a method of folding the connecting part connected to the shaft part toward the base end (the other end connected to the shaft part). Equipped with a type gripping device or an interlocking type screw splitting device, it can be easily divided, has sufficient resistance to insertion of a syringe tip, and does not cause operational problems when punctured or placed in a blood vessel. Thus, we have completed the easily splittable plastic indwelling needle according to the present invention.

(Structure of the Invention) That is, the gist of the first invention of the present application is that one end of a connecting part having an easily tearable part is connected to a shaft part having a linear weakened part, and a foldable gripping tool is attached to the other end of the connecting part. The gist of the second invention relates to an easily splittable plastic indwelling needle comprising: a shaft portion having a linear weakened portion and one end of a connecting portion having an easily tearable portion; This invention relates to an easily split plastic indwelling needle equipped with an interlocking screw splitter at the end.

The present invention will be explained in more detail below with reference to the accompanying drawings. Figures 1 (A) and (B) are the first
This is an embodiment of the splittable plastic indwelling needle according to the invention.

The shaft portion 1 is made of polypropylene, and the linear weakened portion 4 is made of a material obtained by adding 80% by weight of barium sulfate to the polypropylene, and is provided over the entire length of the shaft. The method of providing the weakened portion is not limited to this, and for example, perforations, V-notches, etc. may be provided. In this embodiment, two linear weakened portions are provided at symmetrical positions, but from the viewpoint of ease of separation, it is preferable to provide a plurality of linear weakened portions. In addition to the above-mentioned polypropylene, the plastic material may include polyethylene, polyvinyl chloride, fluororesin, polycarbonate, and the like.

The connecting portion 2 is made of the same plastic material as the shaft portion, and may be, for example, cylindrical as shown in FIG. 1, or may be funnel-shaped with its diameter increasing toward the base.

Similar to the shaft part, this connection part is also provided with easily tearable parts 5 over the entire length, preferably in plurality, at positions corresponding to the shaft part. The easily tearable portion may be formed by adding barium sulfate or the like, similar to the shaft portion, or by forming a V-notch or the like. A foldable gripping tool 3 is integrally provided on the proximal end side of the connecting portion.

The foldable gripping tool 3 is formed as a folding structure as shown in FIG. 1 (except when tearing, as shown by the solid line in FIG. To avoid this, it is preferable to use a fastening device such as a button or a hook so that it can be fastened to the outer wall of the connection part.The folding structure may have a thin folded part,
It may use a hinge or the like. A slit may also be provided to facilitate folding at an acute angle. Furthermore, in order to avoid reducing the strength of this folded part too much and causing it to tear from this part, it may be reinforced using metal wire or fibers. When tearing, the connecting portion and the shaft portion can be easily separated by holding the gripping tool 3 horizontally as shown by dotted lines in FIGS. 1(A) and 1(B) and pulling both ends apart. Furthermore, in this embodiment, a notch is provided at the tearing start end of the linear weakened portion 5 toward the shaft portion so that tearing can be easily performed. This causes stress concentration when the gripper 3 is pulled horizontally, making it easier to tear, and at the same time preventing unintentional tearing of parts other than the linear weakened parts. Although not shown, the gripper may be provided with anti-slip notches for convenience when pulling.

Next, the second invention in this area will be explained.

The indwelling needle shown in FIG. 2 is not provided with the foldable gripper 3 of the first invention shown in FIG. 1. In place of this folding grip, an interlocking screw splitting tool 6 as shown in the embodiment shown in FIG. 3 is provided on the base side 2' of the connecting portion 2.

As an example of the screw splitting tool, for example, as shown in FIG.
As shown in the perspective view of FIG. (B) As shown in the plan view, a screw splitter 6 is provided to mesh with the connecting portion 2. To divide the connecting part 2, grasp the connecting part with your fingers as shown in FIG. 4(A), and twist it in the direction of the arrow as shown in FIG. 4(B). As a result of tearing, the easily tearable portion 5 begins to crack, and after that, it is torn while holding the base side 2' of the connecting portion with fingers. The easily tearable portion of the connecting portion is torn, and then the linear weakened portion 4 of the shaft portion 1 is torn to separate the indwelling needle.

The reason why the screw splitter 6 is provided with the curved portion 6q is for insertion of a catheter or the like. In the embodiment of the screw splitting tool shown in FIG. 3(B), instead of the curved portion, the screw splitting tool 6 is provided in the connector part 11 where the catheter 12 and the line that leads the infusion to the catheter are connected. A portion is inserted into the inner cavity 8 of the connecting portion, and the screw splitter 6 is fitted into the notch 9 on the base side of the connecting portion. The division of the indwelling needle according to the present invention is performed in the same manner as described in FIG. 3(A). Figure 3 (C)
In the embodiment of the screw splitter shown in FIG.
3, and the gear 114 of the outer cylinder.
A screw splitting tool 6 is provided in one portion as in the case of FIG. 3(B). The engagement method and division of the indwelling needle are performed in the same manner as described in the embodiments of FIGS. 3(B) and 3(A).

Typical embodiments of the interlocking type screw splitting tool according to the present invention have been explained with reference to FIGS. Needless to say, it can be used.

In addition, the screw splitter 6 shown in FIG. 3 (A>, (B) and (C)
Of course, it is also possible to use it when dividing the indwelling needle shown in FIG.

(Effect of the invention) The easily split plastic indwelling needle according to the present invention can be used in combination with a metal needle, for example, to puncture and indwell a patient without the gripping part being a hindrance to the operation, making it possible to do so smoothly and easily. The entire indwelling needle can be divided into two parts, and even if a catheter or syringe is inserted into the indwelling needle for blood collection or vascular indwelling, etc., the interlocking type screw divider is strong enough to prevent the connection part from breaking during insertion. It has characteristics such as being able to be easily divided.

[Brief explanation of drawings]

FIG. 1(A) is a side view of an easily split plastic indwelling needle according to the first invention of the present application, and FIG. 1(B) is a side view of the easily splittable plastic indwelling needle according to the first invention of the present application.
FIG. 2 is a plan view of the proximal end of the connection part of the indwelling needle shown in A), and FIG. 2 is a side view of the easily splittable plastic indwelling needle according to the second invention of the present application, which is not equipped with an interlocking screw splitter. Figure 3 (A>, (B) and (C) is a perspective view showing an embodiment of the screw splitting tool provided in Figure 2;
FIG. 4(A) is a perspective view showing the state in which the screw splitting tool is provided, FIG. 4(B) is a plan view after the device is provided, and FIGS. 5 and 6 are the conventional indwelling devices. Examples of the needle, FIG. 5 is a longitudinal sectional view of one example, and FIG. 6 is a perspective view of another example. In the figure, reference numeral 1 indicates a shaft portion, 2 a connecting portion, 3 a foldable gripping tool, 4 a linear weakened portion, 5 an easily tearable portion, and 6 a screw splitting tool. Patent applicant Zeon Corporation (A) No. 1 (B) No. 2==331''22ri22' (A) No. CB) Figure (C)

Claims (1)

[Claims] 1. One end of a connecting part having an easily tearable part is connected to a shaft part having a linear weakened part, and the other end of the connecting part is provided with a folding grip. Easy-to-divide plastic indwelling needle. 2. Easily splittable, characterized in that one end of a connecting part having an easily tearable part is connected to a shaft part having a linear weakened part, and the other end of the connecting part is provided with an interlocking type screw splitter. Plastic indwelling needle.