JPH10155902A - Indwelling needle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an indwelling needle which can be handled easily and by which at the time of pulling out an inner cylinder needle, blood can be prevented from leaking and scattering. SOLUTION: An indwelling needle comprises an outer cylinder needle having the opposite end of a needle as an opening part and an inner cylinder needle 2 inserted in the outer cylinder needle 1, wherein the inner cylinder needle 2 is pierced, and an elastic film 4 by which the opening part 3 can be sealed when the pierced hole is closed after the inner cylinder needle 2 is extracted from the outer cylinder needle 1, and the sealed opening part 3 can be opened by applying a little pressure is provided in the vicinity of the opening part 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an indwelling needle which is a medical instrument used for infusion or the like.

[0002]

2. Description of the Related Art An indwelling needle is used to feed a drip into a vein by placing it in a vein of a limb such as an arm of a patient and connecting the drip to a drip container via a drip supply tube. Things.

As shown in FIG. 6, such an indwelling needle is generally composed of an outer cylindrical needle 1 made of plastic or the like, and an inner cylindrical needle made of metal or the like inserted and removed freely into and out of the outer cylindrical needle 1. And 2. The tip of the inner cylinder needle 2
It is in a state of protruding from the tip of the outer cylindrical needle 1. When inserting the indwelling needle into the drip site, the inner needle 2 projecting from the tip of the outer needle 1 first enters the vein, and further follows the entry of the inner needle 2, and the tip of the outer needle 1 Enters the vein. For this reason, it is possible to smoothly insert the liquid into the drip site. After this, pull out the inner needle 2 and
When an infusion liquid supply tube is connected to the opening 3 of the outer cylindrical needle 1 by press fitting or the like, preparation for infusion is completed.

[0004] However, when the indwelling needle is inserted into the drip site and the inner needle is removed, blood flows backward due to venous pressure, leaks and scatters, and there is a risk of infection due to the blood. In particular, in recent years, infectious diseases such as AIDS and hepatitis have become serious social problems, and practitioners such as doctors and nurses are required to be extremely careful in preventing infection. In order to prevent such leakage and scattering of blood, after removing the inner cylinder needle, a drip supply tube is quickly connected to the opening of the outer cylinder needle, or upstream of the vein in which the indwelling needle is inserted. It was necessary to press the part with a finger. However, these operations require skill. If the operation is too slow, blood leaks and scatters, and if it is too early, there is a risk that large bubbles may enter the blood.

In order to solve the above-mentioned problems, various indwelling needles as disclosed in Japanese Patent Publication No. Hei 7-1000074 have been developed, but all of them are complicated to handle. It had disadvantages.

[0006]

SUMMARY OF THE INVENTION In view of the above, an object of the present invention is to provide an indwelling needle which does not leak or scatter blood when the inner needle is withdrawn, and which is easy to handle.

[0007]

Means for Solving the Problems The present invention is an indwelling needle comprising an outer cylinder needle having an opening at the opposite end of the needle tip, and an inner cylinder needle inserted into the outer cylinder needle. After the inner tube needle is pierced by the inner tube needle and the inner tube needle is removed from the outer tube needle, the piercing hole can be closed and the opening can be sealed, and a small pressure is applied. The elastic film capable of opening the opening sealed by the opening is the indwelling needle provided near the opening.

[0008] The present invention 2 is an indwelling needle comprising an outer cylindrical needle having an opening at the opposite end of the needle tip, and an inner cylindrical needle inserted into the outer cylindrical needle, the indwelling needle being penetrated by the inner cylindrical needle. A two-way cock capable of sealing or opening the opening after the inner needle is removed from the outer needle is the indwelling needle provided near the opening.

In the indwelling needle according to the first aspect of the present invention or the indwelling needle according to the second aspect of the present invention, it is preferable that a drip liquid flow path connecting portion is provided at a position different from the direction in which the inner needle of the outer needle is removed.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the indwelling needle of the present invention will be described with reference to the drawings. FIG. 1 shows a schematic cross-sectional view of one embodiment of the indwelling needle of the present invention 1. An inner tube needle 2 is inserted into the outer tube needle 1, and an elastic film 4 is provided near the opening 3 at the end of the outer tube needle 1 on the opposite side of the needle tip. The elastic film 4 is penetrated by the inner needle 2.

The elastic film 4 has elasticity and can close the puncture hole through which the inner needle 2 has been inserted after the inner needle 2 is removed. For this reason,
After inserting the indwelling needle of the present invention 1 into the drip site, the inner needle 2
Is removed, the puncture hole is immediately closed, and the opening 3 is sealed. Therefore, leakage and scattering of blood due to venous pressure can be prevented without performing a special operation.

The elastic film 4 is formed by applying a small pressure to the opening 3 which is sealed after the inner cylindrical needle 2 is removed.
Can be released. For example, as shown in FIG. 2, by partially fixing the elastic film 4 to the inner peripheral surface near the opening 3 of the outer cylindrical needle 1, the elastic film 4 is finely held against the opening 3 by a method such as pressing with a finger. When an appropriate pressure is applied, one end of the elastic film 4 slightly moves toward the distal end of the outer needle 1, and the sealed opening 3 can be opened. The elastic film 4 seals the opening 3 again by removing the applied pressure. Therefore, air bubbles remaining in the outer cylinder needle 1 after the inner cylinder needle 2 has been removed can be removed only by applying a small pressure to the opening 3.

The indwelling needle of the present invention 1 may further be provided with an air vent 6 as shown in FIG. Air vent 6
Is provided with a stopper 5, so that air bubbles remaining in the outer cylinder needle 1 after the inner cylinder needle 2 is removed can be reliably removed at an appropriate timing by operation of a practitioner. In addition, it is possible to prevent these air bubbles from flowing back into the bloodstream. The stopper 5 is not particularly limited, and includes, for example, a two-way cock.

The material of the elastic film 4 is not particularly limited.
For example, rubber, thermoplastic elastomer and the like can be mentioned.
After the indwelling needle according to the first aspect of the present invention is installed at a drip site, an infusion liquid flow path such as an infusion liquid supply tube is connected so that the elastic membrane 4 is pushed inward. According to the indwelling needle of the present invention 1,
Preparations for infusion can be prepared safely and reliably without fear of blood leakage or scattering.

FIG. 4 is a schematic sectional view of an embodiment of the indwelling needle according to the second aspect of the present invention. The indwelling needle of the present invention 2 uses the two-way cock 5 instead of the elastic film 4 in the indwelling needle of the present invention 1. The sealing of the opening 3 by the two-way cock 5 is performed by the operation of the practitioner, so that the sealing can be performed more reliably at an appropriate timing.

The indwelling needle according to the first aspect of the present invention or the indwelling needle according to the second aspect of the present invention is located at a position different from the direction in which the inner cylindrical needle 2 of the outer cylindrical needle 1 is removed.
FIG. 5 is a schematic cross-sectional view of an embodiment in which a drip liquid flow path connecting portion 7 is provided. Drip liquid flow path connection part 7
Before the indwelling needle is set at the drip site, a drip liquid flow path such as a drip liquid supply tube is already connected. Since the connection of the infusion liquid channel to the indwelling needle is performed without blood flow not inserted into the vein, it is safe and secure,
The possibility of blood leakage and scattering is extremely low.

The indwelling needle provided with such a drip liquid flow path connecting portion 7 has a structure other than the elastic film 4 and the two-way cock 5 for sealing the opening 3 after removing the inner cylindrical needle 2. For example, a stopper or the like can be used. When the elastic film 4 is used, it is preferable that the elastic film 4 is entirely fixed to the outer cylindrical needle 1.

[0018]

Since the indwelling needle according to the present invention has the above-described structure, the operation from the removal of the inner needle to the connection of the drip fluid channel can be performed safely and reliably.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing an embodiment of the indwelling needle of the present invention 1. FIG.

FIG. 2 is a view for explaining an operation state of an elastic film 4 in the indwelling needle of the first invention.

FIG. 3 is a schematic cross-sectional view illustrating an embodiment of the indwelling needle of the present invention 1.

FIG. 4 is a schematic cross-sectional view showing an embodiment of the indwelling needle of the present invention 2.

FIG. 5 is a schematic cross-sectional view illustrating an embodiment of an indwelling needle provided with a drip liquid flow path connection portion.

FIG. 6 is a schematic sectional view showing a conventional indwelling needle.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Outer cylinder needle 2 Inner cylinder needle 3 Opening 4 Elastic film 5 Plug 6 Air vent 7 Two-way cock 8 Drop liquid flow path connection

Claims (3)

[Claims] 1. An indwelling needle comprising an outer cylinder needle having an opening at an end opposite to the needle tip, and an inner cylinder needle inserted in the outer cylinder needle, the needle being pierced by the inner cylinder needle. After the inner needle is removed from the outer needle, the puncture hole can be closed and the opening can be sealed, and the opening sealed by applying a small pressure can be removed. An indwelling needle, wherein an openable elastic film is provided near the opening. 2. An indwelling needle composed of an outer cylinder needle having an opening at the opposite end of the needle tip and an inner cylinder needle inserted into the outer cylinder needle, wherein the indwelling needle is penetrated by the inner cylinder needle. An indwelling needle, wherein a two-way cock capable of sealing or opening the opening is provided near the opening after the inner needle is removed from the outer needle. 3. The indwelling needle according to claim 1, wherein the drip liquid flow path connecting portion is provided at a position different from the direction in which the inner needle of the outer needle is removed.