JPH0525626Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] An improved indwelling needle consisting of a plastic inner needle and a metal outer needle used when puncturing a blood vessel and performing extracorporeal circulation or injecting drug solutions. This is a device related to an indwelling needle holder.

[Prior art and problems to be solved by the invention] The indwelling needles described in Utility Model Application No. 61-196573 and Utility Model Application No. 55116643 have wings formed on the outer needle base (connecting tube), and the wings are attached with adhesive. The outer needle tube (syringe needle) is stabilized by securing it to the patient's arm with tape or the like.

However, when the wings are formed on the outer needle base (connecting tube), there is a problem that the wings are bulky, making it inconvenient for packaging, transporting, storing, etc., and requiring extra space.

Therefore, an indwelling needle 21 (FIG. 7) housed in a capsule 26 as shown in FIG. 6 is used.

The indwelling needle 21 housed in the capsule 26 has advantages such as being able to maintain a sterile state until immediately before use, being compact, easy to operate, and requiring less space for storage.

However, when fixing the outer needle 23 to the arm or the like, adhesive tape is pasted around the needle base 25 of the outer needle 23, but the needle base 25 is the only place where the indwelling needle 21 and the adhesive tape come into contact, and the arm There was a problem in that even slight movements such as these caused the device to shake, making the fixed state unstable. .

Particularly in extracorporeal circulation such as infusions and artificial dialysis, which require a long time, the number of movements of the arms and the like is inevitably increased, which can cause damage to blood vessels.

Therefore, the inventor of the present invention has studied various indwelling needles and indwelling needle holders that can maintain a stable fixed state for a long time and have the advantages of an indwelling needle that can be stored in a capsule, and as a result, has arrived at the following idea.

[Means for Solving the Problems] The present invention is a first invention in which an indwelling needle consisting of a metal inner needle and a plastic outer needle is folded into a needle base constituting the plastic outer needle. To provide an indwelling needle in which a wing having a certain hardness is integrally formed and a notch groove is formed in the wing.

As a second invention, an indwelling needle holder is provided in which an indwelling needle folded so that its wings are wrapped around the needle base is housed in a capsule body having a protrusion formed on its inner surface, and a capsule cap is fitted into the capsule body.

[Example] Fig. 1 shows an exploded perspective view of an indwelling needle 1 of the present invention (Fig. 2 is a view taken in the direction of arrow A in Fig. 1). The indwelling needle 1 is composed of an inner needle 2 made of metal and an outer needle 4 made of plastic having soft wings 6 and 7.

The inner needle 2 is made of a metal needle tube 2' and polypropylene,
It consists of a needle base 3 and a cap 9 made of hard plastic such as polycarbonate.

The outer needle 4 is composed of a needle tube 4' made of a biocompatible resin such as silicone resin or tetrafluoroethylene, a needle base 5, and wings 6 and 7 integrally formed with the needle base 5.

The needle tube 4' and the needle base 5 can be connected, for example, by using a caulking pin 8, by fixing them using an adhesive, or by insert molding using the difference in melting point of the plastic of the outer tube 4 and the needle base 5. It may be twisted and fixed.

Synthetic resins such as polyvinyl chloride and polyethylene can be used as the material for the soft blades 6 and 7. In particular, polyvinyl chloride resin with 30 to 45 parts by weight of a plasticizer added to 100 parts by weight of polyvinyl chloride resin is preferred.

If the amount of plasticizer added is less than 29 parts by weight, the wings themselves lack flexibility and cannot absorb the displacement of the indwelling needle that occurs when the arm moves, resulting in unstable fixation to the arm. It also makes the patient feel uncomfortable.

On the other hand, if the polyvinyl chloride resin has a plasticizer added in an amount of 46 parts by weight or more, the wings 6 and 7 are too soft and cannot be fixed to the arm unstablely, making it impossible to use them as fixed wings.

The wings 6, 7 may also be provided with adhesive tape on the contact surface side to facilitate fastening to the arm.

The blades 6 and 7 are provided with notched grooves 6a.
The wings 6, 7 can be easily bent and folded, and can be stored in an indwelling needle holder, which will be described later. Furthermore, since the blades 6 and 7 can be easily cut at the notch grooves 6a, there is an advantage that the blade length can be adjusted according to the application.

Next, we will briefly explain how to use it.

Pinch the wings 6 and 7 formed integrally with the needle base 5 toward the inside of the indwelling needle 1 with the thumb and middle finger, and simultaneously puncture the inner needle 2 and outer needle 4 into the blood vessel or shunt.

After the puncture, the needle base 3 of the inner needle 2 is pinched and the inner needle 2 is pulled out, leaving only the outer needle 4 in the blood vessel.

A drug solution introduction tube or an extracorporeal circulation circuit tube connector or the like is connected to the needle base 5 of the external needle 4 placed in the blood vessel.

After connection, it is fixed to an arm or the like using the wings 6, 7, needle base 5, and various tubes.

Since the wings 6 and 7 are flexible, they can easily adhere to the arm, etc., and maintain a stable fixed state. If the arm or the like makes a slight movement, the outer needle 4 can absorb the displacement of the outer needle 4. Damage to blood vessels caused by this can be reduced.

Next, a partially cutaway sectional view of the indwelling needle 1 of the present invention stored in the indwelling needle holder 10 is shown in FIG. 2, and a method of storing and removing the same will be described.

Figure 3 shows an indwelling needle holder 1 consisting of a plastic capsule body 11 and a capsule cap 12.
0 shows a partially cutaway sectional view of the indwelling needle 1 housed in the indwelling needle 1 (FIG. 4 is a cross-sectional view taken from - in FIG. 3).

The indwelling needle holder 10 is made of hard plastic such as hard vinyl chloride, polycarbonate, or polypropylene. Furthermore, a protrusion 13 having an inner diameter slightly smaller than the inner diameter of the capsule body 11 is formed on the inner surface of the end portion on the capsule body 11 side.

When inserting the indwelling needle 1 into the capsule body 11, the wings 6 and 7 of the indwelling needle 1 are folded so as to wrap around the needle base 5, and the indwelling needle 1 is inserted so that the size thereof becomes smaller than the inner diameter of the protrusion 13.

While the wings 6 and 7 are in contact with the protrusion 13, the protrusion 13 causes the wings 6 and 7 to spread out.
When the ends of the wings 6, 7 exceed the protrusion 13, the elasticity of the wings 6, 7 spreads into the internal space of the capsule body 11, and the protrusion 13
becomes a stopper and the indwelling needle 1 cannot be removed from the capsule body 11.

When removing the indwelling needle 1 from the capsule body 11, rotate the indwelling needle 1 to the left or right as shown in FIG. When either one of the indwelling needles 7 is wound around the indwelling needle 1, the total size of the indwelling needle 1 becomes smaller than the inner diameter of the protrusion 13, so that it can be easily taken out.

Further, the capsule body 11 and the cap 12 of the indwelling needle holder 10 are structured so that they can be fitted together.

Further, a gas-permeable adhesive seal can be attached to the outer circumferential surface of the fitting part to fix it.

[Works and effects of the invention] The wings can be folded and wrapped around the device and inserted into the capsule, making it compact and easy to operate, and requiring less space for storage.

Since the blade can be easily cut at the notch groove, the blade length can be adjusted to suit the application, making it easy to use.

Puncture into blood vessels can be made by pinching the wings,
It can be fixed to an arm, etc. using the wings, and even slight movement can be absorbed.

[Brief explanation of the drawing]

Fig. 1 is an exploded perspective view showing the indwelling needle of the present invention, Fig. 2 is a view taken from arrow A in Fig. 1, and Fig. 3 is a partially cutaway cross-section of the indwelling needle of the present invention housed in an indwelling needle holder. Figure 4 is a cross-sectional view of Figure 3, and Figure 5 is a cross-sectional view of Figure 3 when the needle is removed from the indwelling needle holder.
Cross-sectional views, FIG. 6 shows a conventional indwelling needle holder, and FIG. 7 shows a conventional indwelling needle. In the figure, 1 is an indwelling needle, 2 is an inner needle, 2' is a needle tube, and 3
is the needle base of the inner needle, 4 is the outer needle, 4' is the plastic needle tube, 5 is the needle base of the outer needle, 6 and 7 are the wings, 6a is the notched groove, 9 is the cap with a filter, 10 is the indwelling needle holder , 11 is a capsule body, 12 is a cap, and 13 is a protrusion.

Claims (1)

[Claims for Utility Model Registration] (1) In an indwelling needle consisting of a metal inner needle and a plastic outer needle, the plastic outer needle has wings with foldable hardness on the needle base. An indwelling needle characterized in that it is integrally formed and a notch groove is formed in the wing. (2) An indwelling needle holder characterized in that an indwelling needle folded so that its wings are wrapped around the needle base is housed in a capsule body having a protrusion formed on its inner surface, and a capsule cap is fitted into the capsule body.