JPS649030B2 - - Google Patents

Description

Detailed Description of the Invention () Background Technical Field of the Invention The present invention relates to a medical needle for blood collection or a syringe that can be connected to a vacuum blood collection tube or syringe to confirm that the needle has punctured a vein when blood collection or injection is performed. .

Prior art and its problems The configuration of a reduced pressure blood collection device is shown in FIG. 1. 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 plastic or the like that can hold the medical needle A through the hub 2. Reference numeral C denotes a reduced pressure blood collection tube, which consists of a glass tube 4 with a bottom and a rubber stopper 5 that seals the glass tube 4 and can be pierced and penetrated by the needle tube 1. ing.

In order to collect blood, the holder B and the medical needle A are tightly screwed together, and then the vacuum blood collection tube C is inserted into the holder B from the rear end, and the rubber stopper of the vacuum blood collection tube C is inserted.
Push it in until the end face of the holder B matches the mark line 6 of the holder B, and pierce the rubber stopper 5 to the extent that it does not penetrate the connecting side needle tube portion 1a. Then, holding the holder B, puncture the blood vessel at a desired site such as the patient's arm with the puncture-side needle tube portion 1a, and while attempting to fix the arm and the holder relative to each other, further push in the reduced pressure blood collection tube C to open the connection-side needle tube portion 1a. Blood flows into the vacuum blood collection tube C by penetrating the rubber stopper 5.

Another method is to insert a vacuum blood collection tube into the holder 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, resulting in an unnecessary increase in the number of punctures for the blood sample recipient.

FIG. 2 shows a medical needle proposed to solve the above problem. On one side of the rubber sheath fitting locking portion 2b, 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 vein with the needle tube 1, the hub 2 has an air escape passage 7, so the air inside the rubber sheath 3 and the needle tube 1 escapes through the passage 7, and the blood is released under pressure inside the blood vessel. As a result, the puncture can be confirmed because it passes through the passage in the needle tube 1 and flows out into the rubber sheath 3. 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. Since it is thick and strong, it is pushed by the rubber stopper 5, moves slightly in the axial direction, and is compressed in the axial direction while blocking the air escape passage 7. 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. This increases the risk of infection. In other words, the drawback of the medical needle A shown in FIG. 1, which is that puncturing 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. Preventing blood from 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, and the operation after the doctor confirms the puncture. There was a risk of infection from blood leaking into the holder.

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 needle tube 1 is inserted into the tip opening of the tube body 8. Connect the syringe D, then pull the pusher 9 to collect blood, or push the pusher 9 to inject the liquid such as medicine stored in the tube body 8, and when the blood collection or injection is finished, fix the holder B. Hold syringe D
The procedure is to pull out the syringe D and reconnect the next new syringe D, but in this case as well, the second
The conventional medical needle shown in the figure has a problem in that after puncturing is confirmed, the needle tube 1 and the syringe D must be connected quickly before blood flows out of the rubber sheath.

Other medical needles have been proposed that have an extremely small valve mechanism in the hub part that provides liquid-tight ventilation.
The problem is that it is extremely difficult and expensive to manufacture, making it unsuitable for mass production.

() 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 the puncture of a vein by a needle tube by the blood flowing out into the rubber sheath through the passage in the needle tube, but also allows the puncture of a vein by reducing the pressure. To provide an improved easy-to-use needle that can automatically prevent blood flowing into a rubber sheath from flowing out to the outside without any operation of connecting a blood collection tube or a syringe to a needle tube.

The purpose of this is to provide 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 hub on the side of the rubber sheath fitting locking part of the hub. A blood collection or syringe medical needle comprising a transparent or semi-transparent rubber sheath that encloses an extended needle tube portion and is fitted and locked in the rubber sheath fitting and locking part, where the rubber sheath is fitted at an appropriate location. It is characterized by having a short, liquid-tight, air-permeable linear member that is attached through a needle and maintains air permeability between the inside and outside of the rubber sheath.

And, the present invention is a liquid-tight breathable linear member,
This includes embodiments in which the material is a hydrophilic substance that has air permeability, or embodiments in which it is a hydrophobic substance that has air permeability.

() Detailed Description of the Present Invention Detailed Structure of the Present Invention A blood sampling or syringe needle for easy treatment according to a preferred embodiment of the present invention is shown in FIG. 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 transparent or translucent rubber sheath 3 that fits into the connection side needle tube portion 1a like a bag. Become. The needle tube 1 is made of stainless steel tube or the like, the hub 2 is made of plastic or the like, and the rubber sheath 3 is made of plastic or the like.
The bag is made of soft rubber with sufficient flexibility and resilience and is formed into a bag shape with a thin inner thickness and only one end open. The hub 2 has a rubber sheath fitting locking part 2b at one end of the hub 2 on the side that is connected to a reduced pressure blood collection tube or the like, rather than the male threaded part 2a that can be screwed into the holder. Further, the rubber sheath 3 is slightly longer than the connecting side needle tube portion 1a extending from the hub 2 of the needle tube 1 toward the side where the rubber stopper of the vacuum blood collection tube is punctured and connected, and covers the needle tube portion 1a like a bag. The rubber sheath is fitted and locked into the fitting locking portion 2b.

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

In particular, in this embodiment of the present invention, short fibers are attached to an appropriate location of the rubber sheath 3, preferably near the pouch-like end, through a needle, and maintain air permeability between the inside and outside of the rubber sheath 3. The liquid-tight and air-permeable linear member 10, such as a thread, is made of, for example, a hydrophilic material such as a breathable cotton thread or a hydrophobic material such as a nylon thread.

Next, a specific method for manufacturing the medical needle having the above structure will be described.

As shown in FIG. 5a, the hub 2 is formed in a shape that has a needle tube insertion hole inside and a rubber sheath fitting locking portion 2b at one end of the outer surface in the direction along the insertion hole.
is inserted through the needle tube insertion hole into a required part of the outer surface of the needle tube 1 having blade surfaces at both ends and fixed with an adhesive, thereby extending the needle tube 1 toward the rubber sheath fitting locking portion 2b side of the hub 2. The part 1a has the required length, and the connecting side needle tube part is made of a transparent or semi-transparent rubber material and has a thin cylindrical inner thickness with one end open and the other end bag-shaped, as shown in FIG. 5b. The air permeable linear member 10 is passed with a sewing needle through appropriate locations other than the open end of the rubber sheath 3, which is formed to be slightly longer than the needle tube 1a and whose inner diameter is slightly larger than the outer diameter of the needle tube 1, and then cut into short lengths and attached. Next, the rubber sheath 3 may be enclosed in the connection-side needle tube portion 1a, and the open end thereof may be fitted and locked in the fitting and locking portion of the rubber sheath.
In the above method, in order to easily attach the liquid-tight breathable linear member 10 to the rubber sheath 3, it is preferable to
It is preferable to penetrate the liquid-tight and breathable linear member 10 into the rubber sheath 3 with a sewing needle in a direction perpendicular to the longitudinal direction of the rubber sheath 3, and cut the linear member 10 into short appropriate lengths.

() Modification As shown in FIG. 6, a medical needle may be provided with a rubber sheath 3 to which a liquid-tight and breathable linear member 10 is attached near the opening end.

Furthermore, as shown in FIG. 7, a bellows-shaped rubber sheath 3 is placed over the connection side needle tube portion 1a so that it can be easily folded in the axial direction by being pressed against the rubber stopper of the vacuum blood collection tube during blood collection. It can also be used as a medical needle. 1
0 is a liquid-tight breathable linear member.

Also, as shown in Fig. 8, puncture the medical needle A,
After confirming 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 push the pusher 9 further to inject the drug solution or infusion in the tube body 8. It can also be used as a medical needle. 3 is a rubber sheath, and 10 is a linear member.

() Effects As explained above, in the medical needle of the present invention, a transparent or translucent rubber sheath covers the connection side needle tube portion in a bag-like manner and is fitted and locked in the rubber sheath fitting and locking portion of the hub. In this case, a liquid-tight, air-permeable linear member, such as a hydrophilic or hydrophobic substance having air permeability, is inserted through a needle at an appropriate location other than the open end. Therefore, in the medical needle of the present invention, when the needle tube punctures a vein, the air inside the rubber sheath and the needle tube can be discharged to the outside through the liquid-tight breathable linear member due to the pressure of the vein. Blood flows into the rubber sheath through the passage in the needle tube and does not flow out. This means that when the blood that has flowed into the rubber sheath reaches the liquid-tight breathable linear member, when the liquid-tight breathable linear member is made of a breathable hydrophilic substance, the blood flows through a larger passage. Due to the property of coagulating faster when passing through a capillary tube and the swelling property of fibrous materials such as cotton thread, and when made of a hydrophobic material with air permeability, the hydrophobicity of the filter material prevents capillary action. This is because the action prevents blood from passing through the capillaries of the liquid-tight and air-permeable linear members.

Therefore, with the medical needle of the present invention, when puncturing is performed, blood flows out into the rubber sheath and the color inside the rubber sheath changes so that the puncture can be confirmed, but not only that, blood does not flow out of the rubber sheath. As the medical needle itself has been improved, there is more time to connect the needle tube and vacuum blood collection tube or syringe after confirming the puncture. This reduces the burden on doctors who require quick connection operations.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional front view of a conventional medical needle used in a vacuum blood collection tube, etc., in use, and Fig. 2a is a longitudinal sectional front view of a conventional medical needle improved from the above medical needle. Figure 2b is b- in Figure 2a.
FIG. 3 is a longitudinal sectional front view showing a state in which the syringe is used; FIG. 4 is a partially sectional front view of a medical needle according to an embodiment of the present invention; FIGS. 5 a and b
is a manufacturing process diagram for explaining the manufacturing method of the medical needle shown in FIG. 4, and FIGS. 6 to 8 are partially sectional front views or main parts of the medical needle according to the modified example of the present invention, respectively. FIG. 3 is a front view or a front view in a state of use. A...Medical needle, 1...Needle tube, 1a...Connecting side needle tube part, 1b...Puncture side needle tube part, 2...Hub, 2b...Rubber sheath fitting locking part, 3...Rubber sheath, 10... Liquid-tight breathable linear member.

Claims (1)

[Scope of Claims] 1. 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 portion at one end, and a locking portion for fitting the rubber sheath of the hub. A blood collection or syringe medical needle comprising a transparent or translucent rubber sheath that encloses a needle tube portion extending toward the side and is fitted and locked in the rubber sheath fitting and locking part, wherein the rubber sheath A medical needle for blood collection or a syringe, characterized in that it has a short, liquid-tight, air-permeable linear member that is attached to an appropriate location by passing the needle through the rubber sheath to maintain air permeability between the inside and outside of the rubber sheath. 2. The medical needle for blood collection or syringe according to claim 1, wherein the liquid-tight breathable linear member is a hydrophilic substance having breathability. 3. The medical needle for blood collection or syringe according to claim 1, wherein the liquid-tight breathable linear member is a hydrophobic material having breathability.