JPH0446757Y2 - - Google Patents

Description

[Detailed explanation of the idea]

[Industrial Application Field] The present invention relates to a syringe, and more particularly to a syringe that reduces pain during insertion. [Prior Art] Methods for administering drugs into the body include injection, ingestion, and application. Among these, injection can rapidly increase the blood concentration of the drug and can be said to be the most rapidly effective and reliable administration method. A syringe generally consists of a needle of a predetermined thickness and length, a cylindrical syringe barrel body, and a piston body. [Problems that the invention aims to solve] Although injections are a fast-acting and highly reliable method of administering drugs, the treatment by doctors and the pain caused by needle insertion can be very painful for patients. There is.
The reality is that the pain caused by needles should be eliminated, if possible, not only for children but also for adults and the elderly, and the emergence of needles and syringes that cause less pain has been eagerly awaited. [Means for solving the problem] Under these circumstances, the inventor of the present invention has conducted various studies in order to provide a syringe that causes less pain. The present invention was developed based on the discovery that the pain of needle insertion can be reduced by applying strong pressure to the skin around the area. That is, in the present invention, a rod-shaped skin pressure guide having a protrusion length different from that of the injection needle or a frame-like skin pressure guide having an inclined ring surrounding the injection needle at the tip is provided on the syringe barrel body and protrudes in the same direction as the injection needle. This syringe is characterized by: [Examples] The present invention will be further described below with reference to drawings showing examples of the present invention. 1 is a cylindrical syringe barrel body, 2 is the syringe barrel body 1
The piston body 3 inserted therein is a syringe needle attached to the tip of the syringe barrel body 1, which itself has the same structure as a conventional syringe. Reference numeral 4 denotes a skin pressure guide, which has a protrusion length different from that of the injection needle 3 and is provided in the injection barrel main body 1 so as to protrude in the same direction as the injection needle 3. The length of this skin compression guide 4 is the length of the syringe barrel body 1.
It must be longer or shorter than the protrusion length of the needle 3 from the tip 11 end of the needle 3 or the protruding length of the needle 3 from the base 31 end of the injection needle 3. In particular, the difference l between the tip of the skin compression guide 4 and the tip of the injection needle 3 It is preferable that both the long and short lengths are within 10 mm. Incidentally, as shown in FIG. 3, the injection needle 3 is generally inserted at a constant angle α with respect to the skin surface. Therefore, the tip of the skin pressure guide 4 and the injection needle 3
If there is no difference between the tip and the tip, the pressure from the tip of the guide 4 will be excessive, causing pain due to the guide 4 itself. On the other hand, if the difference l exceeds 10 mm, it will be difficult for the tip of the guide 4 to even contact the skin. Become. Therefore, if the skin compression guide 4 is longer than the protruding length of the injection needle 3, if the injection needle 3 is inserted with the guide 4 positioned above the injection needle 3, the needle 3 will be inserted. Pressure is applied to the upper part of the skin. On the other hand, if the skin compression guide 4 is shorter than the protruding length of the injection needle 3, if the injection needle 3 is inserted with the guide 4 positioned below the injection needle 3, the inserted skin will be removed. Pressure is applied to the lower part of the body. Further, the form of the skin compression guide 4 may be any rod-shaped body (see Figures 1 and 2) or a frame body with an inclined ring surrounding the injection needle at the tip (see Figure 4). . In the case of the former rod-shaped body, the shape of the tip can be spoon-shaped, spherical, hemispherical, prismatic, pyramidal, star-shaped, etc., as shown in Figure 2, but if the tip is sharp, It is preferable to have a slightly rounded shape since it is easy to damage the skin and cause pain. On the other hand, in the case of the latter frame, it is convenient to have a structure in which a ring 43 surrounding the injection needle 3 is obliquely provided at the tips of a pair of support rods 41 and 42 having different lengths. Note that the material of the skin compression guide 4 does not matter; for example, polyethylene, polypropylene,
Examples include plastics such as vinyl chloride and polyester; metals such as aluminum and stainless steel; mineral-derived materials such as glass, pottery, and ceramics; wood; and materials having a certain hardness such as hard paper. The means for attaching the skin compression guide 4 to the syringe barrel body 1 may be any means as long as it can be formed in a protruding manner, but for example, when the guide 4 is molded separately, it may be made of metal or other suitable material. Using a plastic tightening ring 5, attach and fix it to the side wall of the tip of the syringe barrel body 1 [see Figures 1 and 2], or attach and fix it to the side wall of the base of the injection needle 3 [see Figure 1, 3]. , Method of attaching the injection needle 3 to the tip of the syringe barrel body 1; Either the guide body 4 is integrally molded on the side wall of the tip of the syringe barrel body 1 when the syringe barrel body 1 is molded (see FIG. 1, 4), or At the time of molding, the injection needle 3 is integrally molded on the side wall of the base of the injection needle 1.
An example of this method is to attach the syringe to the tip of the syringe barrel body 1. Further, as shown in FIG. 5, the guide 4
If a buffer member such as a spring 6 is interposed at the base, unnecessary pressure on the skin can be prevented, and
Gives particularly good results. Next, the present invention will be further explained with reference to Examples. Experimental Example 1 For prototypes 1 to 3 below, the tips of the injection needle and skin pressure guide were pressed against a rubber plate placed on a Mettler digital balance, and then the injection needle was further inserted 5 mm into the rubber plate. The value displayed on the balance at that time was measured as the skin pressure force of the guide. The results are shown in Table-1.

[Table] Prototype 1 A syringe barrel with a content of 1 ml has a length of 30 mm on the side wall of the tip.
A stainless steel skin compression guide (having a sphere with a diameter of 2 mm at the tip) with a thickness of 1 mm and a diameter of 1 mm was attached protrudingly. The length of the needle attached to the syringe barrel is 25mm.
The tip of the guide is 5 mm shorter than the tip of the injection needle. Prototype 2 Same as Prototype 1 except that the length of the skin compression guide is 20 mm, so the tip of the guide is 5 mm longer than the injection needle. Prototype 3 Same as Prototype 1 except that the tip of the skin pressure guide is a square pyramid with a side of 2.5 mm. Experimental Example 2 Prototype 1 and a comparison product, which is a syringe without a skin pressure guide, were each inserted into the left and right upper arms of 10 healthy male adults, and the pain was evaluated. The results are shown in Table-2.

【table】

[Effect]

The mechanism of pain reduction when using the syringe of the present invention is not necessarily clear. However, the skin has nerve terminals that transmit sensations such as pain, coldness, heat, pressure, etc. from the spinal cord to the brain. Pain is transmitted through thin fibers called A-delta and C, while tactile and pressure sensations are transmitted through thick fibers called A-beta. These fibers connect to the dorsal horn of the spinal cord, but when A-beta fibers are stimulated, it becomes difficult for pain to be transmitted to the pain-transmitting cells in the spinal cord. Therefore, if pressure is applied near the injection site, Abeta fibers are stimulated, and as a result, the pain of needle insertion is thought to be reduced. [Effects of the invention] Accordingly, when the syringe of the present invention is used, the skin pressure guide tip presses the skin before or during the insertion of the injection needle into the skin, reducing pain. It can also alleviate the aversion and fear caused by traditional injections.

[Brief explanation of the drawing]

1 to 4 are front explanatory views showing examples of the inventive syringe, respectively; FIGS. 2 1 to 6 are front explanatory views showing examples of the shape of the tip of the skin compression guide, respectively;
3. FIGS. 1 and 2 are schematic explanatory diagrams showing the state of injection using the syringe of the present invention, and FIG. 4 shows an embodiment as a frame of the skin compression guide.
2 is an explanatory front view thereof, 2 is an explanatory perspective view thereof, and FIG. 5 is an explanatory cross-sectional view of a main part showing an example of a skin compression guide with a spring.

Claims (1)

[Scope of utility model registration request] The syringe barrel body is characterized by a rod-shaped skin pressure guide having a protrusion length different from that of the syringe needle, or a frame-shaped skin pressure guide having an inclined ring surrounding the syringe needle at the tip, which projects in the same direction as the syringe needle. syringe.