JP3118321U - Plastic needles and medical devices - Google Patents

Abstract

To provide a plastic needle and a medical device in which an AVF needle (or indwelling needle) does not come out of a mouth by forming a holding groove for the AVF needle (or indwelling needle) in a collar part of the plastic needle. .
A needle tube (2) is formed integrally with a needle base (3), a liquid passage (5) is formed in a front side portion of the needle tube (2), and a flange is formed on the outer periphery of the needle base (3). A plastic needle (1) provided with (4) protruding and having a holding groove (8) for the tube T formed in the flange (4). In the plastic needle (1), a guide groove (9) narrower than the holding groove (8) was formed continuously to the holding groove (8) of the tube (T).
[Selection] Figure 1

Description

  The present invention relates to an improvement of a plastic needle used by attaching to a medical device such as an infusion set, a blood transfusion set, a blood circuit, and the like, and a medical device equipped with the plastic needle.

Hereinafter, the case of hemodialysis will be described.
(1) Priming Connect the tube side of an infusion set with a plastic needle to a blood circuit (arterial side circuit), stab the plastic needle into the mouth of a container containing physiological saline, and apply the physiological saline to the plastic needle and tube. After that, the blood circuit (arterial circuit and venous circuit) and the dialyzer are primed.
After priming, the plastic needle is removed from the mouth of the container containing physiological saline, but the tube or blood circuit (arterial circuit) is closed with a clamp or the like (the liquid flow path is blocked), and the physiological needle is removed from the plastic needle. Prevent salt water from leaking.
In the case of a patient whose blood pressure has decreased due to a cold or the like, the physiological needle needs to be administered again from the plastic needle during hemodialysis, so the plastic needle is left stuck in a container containing physiological saline.
(2) Hemodialysis AVF needles (connected to the arterial and venous circuits, or indwelling needles may be used) are inserted into the patient's arterial and venous sides, respectively, It dialyzes with a dialyzer through the arterial circuit and returns to the patient through the venous circuit.
(3) Collection of residual blood Collect residual blood in the blood circuit (arterial circuit and venous circuit) and dialyzer. Remove the AVF needle from the patient's arterial side, stab into the physiological saline container (the mouth), and pass the physiological saline through the AVF needle and tube to the arterial circuit, dialyzer, and venous circuit. The blood circuit (arterial circuit and venous circuit) and residual blood in the dialyzer are returned together from the venous side to the patient.
During the operation, a plastic needle and an AVF needle (or an indwelling needle) are stuck in the physiological saline container (or its mouth), but the plastic needle and the AVF needle (or indwelling) are placed in the container (or the mouth). When the needle is stabbed for a long time, a load is applied to the container (or its mouth), and the AVF needle (or the indwelling needle) having a smaller needle diameter is usually easier to come off.

In the case of a plastic needle, Patent Document 1 and Patent Document 2 disclose an invention in which ribs and small protrusions are provided on the outer periphery of the needle tube as a device for making it difficult to remove from the container (the mouth thereof).
In the invention of Patent Document 1, the lowest end of the rib is in close contact with the surface of the mouth of the container, so that once the plastic needle is pierced, it cannot be easily pulled out. In the invention of Patent Document 2, since the small protrusion is inserted and locked in the stopper of the vial, resistance is provided so that it does not come off from the stopper.

On the other hand, in the case of the AVF needle, since the needle tube is made of metal and the needle diameter is small, it can be easily removed from the mouth of the container as compared with the plastic needle as described above. However, in the case of an AVF needle (or indwelling needle), it punctures the patient's artery / vein in the first place, so as with the plastic needle, it is removed from the container (or its mouth) as in Patent Document 1 and Patent Document 2. If it is difficult to project ribs or small protrusions on the outer circumference of the needle tube so as to be difficult, it is dangerous. Even if trying to project, the needle tube of the AVF needle is made of metal and the needle diameter is small, so that it is difficult to process.
Japanese Utility Model Publication No. 62-119946 (see FIGS. 2 and 3) Japanese Patent Publication No. 06-26585 (see FIG. 39)

  If both the plastic needle and the AVF needle (or the indwelling needle) are stabbed into the container (the mouth part) for a long time, the AVF needle (or the indwelling needle) having a smaller needle diameter is more easily removed. .

[1] The present invention integrally forms a needle tube (2) on the needle base (3), and forms a liquid passage (5) on the front side of the needle tube (2).
Provided is a plastic needle (1) having a collar (4) protruding from the outer periphery of the needle base (3) and having a holding groove (8) for a tube T formed in the collar (4).
[2] The plastic needle (1) according to [1], wherein the guide groove (9) narrower than the holding groove (8) is formed continuously with the holding groove (8) of the tube (T). ).
[3] The present invention provides the plastic needle (1) according to [1] or [2], in which at least two holding grooves (8) of the tube (T) are formed in the collar portion (4).
[4] In the present invention, a rib (7) is provided on the outer periphery of the needle tube (2), and the rib (7) is inclined downward in the direction of the tip of the needle tube (2), and the needle base (3) Provided is a plastic needle (1) according to any one of [1] to [3], which has a shape inclined upward in the direction.
[5] The present invention provides a medical device equipped with the plastic needle (1) according to [1] to [4].

  By forming the holding groove 8 of the AVF needle 10 (or indwelling needle) in the collar portion 4 of the plastic needle 1, the plastic needle 1 and the AVF needle are formed in the mouth portion 12 of the infusion solution container (contained with physiological saline) 11. 10 (or indwelling needle) is pierced at the same time, the load of the AVF needle 10 (or indwelling needle) is supported by the holding groove 8 of the collar part 4 of the plastic needle 1, so the load on the mouth part 12 is reduced. The AVF needle 10 (or indwelling needle) does not come out of the mouth portion 12.

FIG. 1 is a perspective view of a plastic needle 1 of the present invention, FIG. 2 is an enlarged view of a collar 4 of the plastic needle 1 of the present invention, (a) is Example 1, (b) is Example 2, and (c). FIG. 3 is a view showing a usage state of the plastic needle 1 of the present invention.
In the plastic needle 1 of the present invention, a needle tube 2 is formed integrally with a needle base 3, and a liquid passage 5 is formed in a front side portion of the needle tube 2. A collar 4 is projected from the outer periphery of the needle base 3, and a holding groove 8 for the tube T is formed in the collar 4.

[Needle tube 2]
As shown in FIG. 1, the needle tube 2 is formed with a liquid passage 5 in the front side portion, thereby reducing the cross-sectional area of the tip of the needle tube 2 and maintaining the strength of the needle tube 2. The piercing resistance at the time of piercing into the mouth portion 12 (the plug body) of the (water container) 11 can be minimized, and the piercing operation can be facilitated. Moreover, you may project the rib 7 in the outer peripheral wall of the needle tube 2 as needed.

[Human part 4]
As shown in FIG. 1, the collar portion 4 protrudes from the outer periphery of the needle base 3.
The collar portion 4 is made of plastic (synthetic resin) made of the same material as the needle tube 2 or the needle base 3, and may be integrally formed with the needle base 3, or as a separate part from the needle tube 2 or the needle base 3, the same material or a different material. And may be attached to the needle base 3. 1 to 2, the collar portion 4 is formed in a substantially semicircle or a substantially circular shape, but may be a substantially square, a substantially rectangular shape, or a substantially rhombus shape.
Further, a holding groove 8 for the tube T is formed in the collar portion 4. 1 to 2, the holding groove 8 is formed in a substantially circular shape. However, when the tube T is mounted, the holding groove 8 is held (fixed) without blocking liquid flowing in the tube T. ) Anything other than a substantially circular shape can be used.
In Example 1 of FIG. 2A, a holding groove 8 for the tube T is formed in one place on the substantially semicircular flange 4. In Example 2 in FIG. 2B, two holding grooves 8 of the tube T are formed. By forming the tube T in two places, the tube T can be attached to the holding groove 8 from either direction, so that the tube T can be attached without forcibly twisting at the time of attachment, so that the operability is improved. In Example 3 of FIG. 2C, the tube T can be easily guided to the holding groove 8 by providing the guide groove 9 having a smaller width than the holding groove 8 continuously to the holding groove 8.
The holding groove 8 may be formed at least at one place, but the operability can be improved as described above by forming two or four places.

[Rib 7]
In the illustration of FIG. 1, the rib 7 is formed at two locations on the outer periphery of the needle tube 2, and is inclined downward (smaller) toward the tip of the needle tube 2, and inclined upward (larger) in the direction of the needle base 3. Although it is formed in a small substantially wing shape, it may be formed in three or four places on the outer periphery of the needle tube 2 or may be formed in a ring shape.
In short, the rib 7 may be anything as long as it has a shape that is inclined downward (becomes smaller) in the tip direction of the needle tube 2 and is inclined upward (becomes larger) in the direction of the needle base 3.
As illustrated in FIG. 3, when the needle tube 2 is pierced through the mouth portion 12 (plug) of the infusion solution container 11 and the plastic needle 1 is pushed in the mounting direction of the mouth portion 12 as it is, the rib 7 is also in the mouth portion 12 at the same time. Enter. The rib 7 can enter without spreading the meat of the mouth portion 12 without resistance. If the rib 7 penetrates, the plastic needle 1 can be fixed as it is. In other words, the lowermost end portion of the rib 7 which is formed to be large is in close contact with the surface of the mouth portion 12, so that once the plastic needle 1 is pierced, it cannot be easily pulled out even if it is pulled out. In other words, since the plastic needle 1 is firmly fixed to the mouth portion 12, it can withstand the total weight of each part of each infusion set during use, and the force (load) applied in the direction in which the needle tube 2 is pulled out is suppressed (reduced) as much as possible. )can do.

  When using the plastic needle 1 of the present invention, as illustrated in FIG. 3 (in the case of hemodialysis), a holding groove 8 for the AVF needle 10 (or indwelling needle) is formed in the collar portion 4 of the plastic needle 1. Thus, even if the plastic needle 1 and the AVF needle 10 (or indwelling needle) are simultaneously inserted into the mouth portion 12 of the infusion solution container (contained physiological saline) 11, the load of the AVF needle 10 (or indwelling needle) is Since it is supported by the holding groove 8 of the collar portion 4 of the plastic needle 1, the load applied to the mouth portion 12 is reduced, and the AVF needle 10 (or the indwelling needle) does not come out of the mouth portion 12.

Perspective view of the plastic needle 1 of the present invention Enlarged view of the collar 4 in FIG. 1 (a) Example 1, (b) Example 2, (c) Example 3 Usage state diagram of the plastic needle 1 of the present invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Plastic needle 2 Needle tube 3 Needle base 4 Gutter part 5 Liquid passage 7 Rib 8 Holding groove 9 Guide groove 10 AVF needle 11 Infusate container 12 Mouth part T Tube

Claims (5)

A needle tube (2) is formed integrally with the needle base (3), a liquid passage (5) is formed on the front side of the needle tube (2), and
A plastic needle (1) characterized in that a collar (4) is projected from the outer periphery of the needle base (3), and a holding groove (8) of the tube T is formed in the collar (4).   The plastic needle (1) according to claim 1, wherein a guide groove (9) narrower than the holding groove (8) is formed continuously to the holding groove (8) of the tube (T).   The plastic needle (1) according to claim 1 or 2, wherein at least two holding grooves (8) of the tube (T) are formed in the collar portion (4).   A rib (7) is provided on the outer periphery of the needle tube (2), and the rib (7) is inclined downward in the direction of the tip of the needle tube (2) and is inclined upward in the direction of the needle base (3). The plastic needle (1) according to claims 1 to 3, comprising a shape.   A medical device equipped with the plastic needle (1) according to claim 1.