JPS58212454A - Medical needle - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention (1) Background of the Invention Technical Field The present invention relates to a medical blood collection or syringe that can be connected to a vacuum blood collection tube or needle to confirm whether the needle has punctured a vein when blood is collected or injected. This invention relates to a needle and a method for manufacturing the same.

Prior art and its problems The structure of a reduced pressure blood collection device is shown in FIG. A is a blood collection needle (hereinafter referred to as a medical needle as it may be used as an injection needle as described later), which includes a needle tube 1, a hub 2, and a holder for collecting blood into multiple vacuum blood collection tubes with one puncture. It consists of a rubber sheath 3 that prevents blood from flowing into the body. B is a cylindrical holder made of transparent glass or the like that holds the medical needle A through the hub 2. Reference numeral C denotes a vacuum blood collection tube, which consists of a bottomed glass tube 4 and a rubber stopper 5 which can be sealed tightly and penetrated through the needle tube 1. The pressure is reduced to

To collect blood, firmly screw holder B and medical needle A together, and then insert vacuum blood collection tube C into holder B from the rear end [7.
Push it in until the landmark i gland 6Vc coincides with the needle tube part 1aS on the connecting side of the rubber stopper 5: Push it in as far as it will not penetrate. Then, holding the holder B, puncture the blood vessel at a desired site such as the arm of the blood sample with the puncture side needle tube part 1a (7), and while relatively fixing the arm and the holder as shown in FIG. By passing the portion 1a through the rubber stopper 5, blood flows into the vacuum blood collection tube C.

Another method is to insert a reduced pressure blood collection tube into the boulder after puncturing. However, with the vacuum blood collection device configured as described above, it cannot be confirmed that the needle tube 1 has punctured a vein until the needle tube 1 is passed through the rubber stopper 5 and the presence or absence of blood flowing into the vacuum blood collection tube C is checked. If no blood flows into the reduced pressure blood collection tube C, puncturing must be attempted again, and the number of punctures for the blood sample recipient increases unnecessarily.

Therefore, the second medical needle proposed to solve the above problem. , shown in Sono 1. Rubber sheath fitting locking part 2. On one side of b, there is an air escape passage 7 that communicates the inside and outside of the rubber sheath 3. When this medical needle A punctures the needle tube 1 into a vein (lζ), the hub 2 has an air escape passage 7, so the air in the rubber sheath 3 and the needle tube 1 escapes through the passage i, and the blood flows into the blood vessel. Due to pressure, the Q1 pipe 1
The puncture can be confirmed because it flows out into the rubber sheath 3 through the inner passage. After that, if the connecting needle tube portion 1a is inserted until it penetrates the rubber stopper, a predetermined amount of blood corresponding to the predetermined degree of vacuum will be drawn into the vacuum blood collection tube without coming into contact with the outside air, and at the same time, the rubber sheath 3 will be removed. Rubber stopper 5 because it is thick and strong.
The air escape passage 7 is pushed by and moved slightly in the axial direction.
is compressed in the axial direction with the area closed. However, if there is a delay in connecting the needle tube 1 and the vacuum blood collection tube after confirming the puncture, blood not only flows out through the passage in the needle tube 1 into the rubber sheath 3, but also flows out into the holder through the air escape passage 7. Storing it away increases the risk of infection. In other words, the drawback of the medical roof □A shown in FIG. 1, which is that puncture cannot be confirmed, can be improved by allowing air to escape from the air escape passage 7 and causing blood to flow into the rubber sheath. However, prevention of blood flowing into the holder can only be achieved by quickly connecting the vacuum blood collection tube to the medical needle A before blood flows out. There was not enough room and there was a risk of infection from blood leaking into the boulder.

Similar problems arise with medical needles when blood is collected or injected using a syringe instead of the vacuum blood collection tube described above. That is, as shown in FIG. 3, the needle tube 1 is punctured into a vein, and after confirming the puncture, the syringe D is pushed into the holder B until the tip opening of the tube body 8 + the rc needle tube 1 is inserted. The syringe D is connected, and then the pusher 9 is pulled to collect blood.
The conventional practice is to inject a liquid such as a medicinal solution contained in the syringe Vζ, and after the blood collection or injection is finished, hold the holder B fixed, pull out the syringe D, and reconnect the next new syringe D. In the case ((also shown in Fig. 2), after confirming the puncture with a conventional medical needle, the needle tube 1 and the syringe D must be connected quickly to prevent blood from flowing out of the rubber sheath. be.

Other medical needles have been proposed that have an extremely small valve mechanism that provides air-tight ventilation in the hub portion, but they are extremely difficult to manufacture and expensive. The problem is that they are not suitable for childbirth.

(n) Purpose of the Invention The present invention has been devised in view of the above-mentioned points, and it not only makes it possible to confirm puncturing of a vein with a needle tube by the blood flowing out into the rubber sheath through a passage in the needle tube, but also provides the following features: To provide a medical needle that is improved so that blood that has flowed into a rubber sheath can be automatically prevented from flowing out to the outside without any operation of connecting a vacuum blood collection tube or a syringe to a needle tube.

According to the invention, this purpose is achieved by providing a needle tube having cutting surfaces at both ends;
A hub that supports the middle of the outer surface of the needle tube and has a rubber sheath fitting and locking part at one end, and a connecting side needle back portion of the hub that extends toward the rubber sheath fitting and locking part side, and the rubber In a medical needle Vζ consisting of a transparent or semi-transparent rubber sheath that is fitted and locked in a sheath fitting locking part, a substance 1 dissolved in blood is present between the rubber sheath fitting locking part and the rubber sheath. This is achieved by a medical needle characterized in that a water-soluble member is held between the water-soluble members and a gap is formed between the holding parts eζ of the water-soluble member to communicate the inside and outside of the rubber sheath.

(River) Detailed Description of the Present Invention Specific Structure of the Present Invention A preferred embodiment of the present invention is shown in FIG. 4 as a medical needle. The medical needle A includes a needle tube 1 having blade surfaces at both ends, a hub 2 that supports the middle of the needle tube 1, and a blood collection tube side needle tube portion 1.
Transparent or translucent rubber sheath 3 that fits into the aIC bag shape
It consists of

The needle tube 1 is made of a stainless steel tube or the like, and the hub 2 is made of plastic 7 or the like. It is formed into a bag shape with only one opening.

The hub 2Vc has a male threaded portion 2 that can be screwed into the boulder.
There is also a rubber sheath fitting locking part 2b at one end of the side connected to a reduced pressure blood collection tube or the like on the side a. Further, the rubber sheath 3 is inserted from the hub 2 of the needle tube 1 into the rubber stopper Vζ of the vacuum blood collection tube and is connected to the side e (extends). The rubber sheath is fitted into and locked into the locking portion 2bK.

The above configuration is no different from a conventional medical needle.

In this embodiment of the present invention, a water-soluble member 10 that dissolves in blood is sandwiched between the rubber sheath fitting locking portion 2b and the rubber sheath 3, and the water-soluble member 10 is sandwiched between (
A gap 11 that communicates the inside and outside of the rubber sheath 3
is formed. The water-soluble materials include water-soluble polymer compounds and other water-soluble substances. 1 Presaccharide fibers such as Oprah, Door, or Pullulan (products of Hayashibara Biochemical Research Institute) α-1, 4 ; α-1, 6G
It is preferable to use lucan or a plurality of these thin films bundled and cut into linear or band shapes with an appropriate thickness to create gaps. It is not recommended to wrap or bundle wafers very tightly, as this will cause the warp to become too dense and the permeation and dissolution of blood will be delayed.Wrap loosely to a thickness that allows gaps to remain even if the wafer is held for a certain period of time. Or better yet, bundle them up.

(A modified example of the present invention As shown in FIG.
It may be a medical needle which is covered with the connecting side needle tube portion 1a and which is pressed against the rubber stopper of the vacuum blood collection tube during blood collection and tends to overlap in the axial direction V.

2b is a rubber sheath fitting locking portion, and 10 is a water-soluble member.

As shown in step 6, puncture the medical needle A, confirm the puncture, push the syringe D from the rear end of the holder B to connect it to the needle tube 1, pull the pusher 9 to collect blood, or 9 may be further pushed in to collect blood by injecting the medicinal solution or infusion in the tube body 8, and may also be used as a medical needle for a syringe.

3 is a rubber sheath, and 1o is a water-soluble member.

(V) Specific effects and effects of the present invention As explained above, the medical needle of the present invention has a transparent or translucent rubber sheath covering the connecting side needle tube portion in the form of a bag, and the rubber sheath of the hub is fitted into the needle tube. In a product that is fitted and locked to a locking part, a water-soluble member that can dissolve in blood is sandwiched between the rubber sheath and the rubber sheath fitting and locking part on one side to communicate the inside and outside of the rubber sheath. This is a configuration with a gap. Therefore, in the medical needle of the present invention, when the needle tube is punctured into a vein, the air inside the rubber sheath and the needle tube is released due to the pressure inside the blood vessel such as the vein. Since the water-soluble material can be drained to the outside through the gap formed by the sandwiching, blood from the veins flows through the passage in the needle tube and flows into the rubber sheath, and the blood that flows into the rubber sheath also flows between the rubber sheath and the rubber sheath. When the gap between the rubber sheath and the locking part is reached, the water-soluble material forming the gap quickly dissolves in the blood and the gap disappears. Liquid-tight 9 blood will not leak out of the rubber sheath.

For this reason, when the medical needle of the present invention punctures, blood flows into the rubber sheath and the color of the rubber sheath changes, allowing confirmation of puncture into the blood vessel. Not only that, the medical needle body has been improved to prevent blood from flowing out of the rubber sheath, so there is more time to connect the needle tube and vacuum blood collection tube to the syringe after confirming puncture. The burden on doctors, who conventionally required quick connection operations to prevent blood from leaking outside, can be reduced. Therefore, patients do not have to feel unnecessarily anxious, and the drawbacks of conventional medical needles can be overcome.

[Brief explanation of the drawing]

Figure 1 is a vertical front view of a medical needle used in a conventional vacuum blood sampling device, etc., and Figure 2 (a) is a conventional medical needle that has been improved by I- compared to the same medical needle. Longitudinal cross section of needle i, E
11b-Jib sectional view in Figure 2 (・); Figure 3 is a longitudinal sectional front view of a conventional medical needle in use with a syringe; Figure (a) is a partially sectional front view of a medical needle according to an embodiment of the present invention;
FIG. 4(b) is a 1Vb-IVb sectional view in FIG. 4(a), and FIG. 5 is a partially sectional front view of a medical needle having a bellows-shaped rubber sheath according to a modified example of the present invention. , FIG. 6 is a partially sectional front view showing the state in which the medical needle of the present invention is used as a syringe. A...Medical needle, 1...Needle tube, 1a...
Connection side needle tube part, 1b...Puncture side needle tube part, 2...Hub, 2b...Rubber sheath fitted locking part, 3...Rubber sheath, 10...Water-soluble member, 1
1... Gap. Patent applicant: Terumo Corporation '-T' 1. 'jQ -11i -tlE
Book - December 1982+
51:1 Special, 4'f RF Director Mr. Furoo Wakasugi 2 Name of invention Medical needle 3 Name to be amended/Relationship with basis Patent applicant address 2-44-1 Hatagaya, Shibuya-ku, Tokyo Name Chill Seven Co., Ltd. 4 Agent Postal code 107 T E L (03
) 582-00011 Address 1-1 Akasaka, Minato-ku, Tokyo
No. 18 Hosokawa Building 906 Specification, page 2, lines 1 and 2, ``1 medical set and manufacturing method thereof'' is corrected to 1 medical needle A.

Claims (1)

[Claims] A needle tube having blade surfaces at both ends, a hub that supports the middle of the outer surface of the needle tube and has a rubber sheath fitting locking part at one end, and a connecting side needle tube extending toward the rubber sheath fitting locking part side of the hub. A medical needle comprising a transparent or semi-transparent rubber sheath that encloses a portion of the rubber sheath and is fitted and locked in the rubber sheath fitting locking part, the rubber sheath fitting locking part and the rubber sheath A medical needle characterized in that a water-soluble member capable of dissolving in blood is sandwiched between the needles, and a gap is formed between the sandwiching of the water-soluble member to communicate the inside and the outside of the rubber sheath. .