JPS5820268Y2 - indwelling needle - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of an indwelling needle used for hemodialysis and the like.

For example, it is well known that when performing blood dialysis, an indwelling needle is inserted into a patient's blood vessel.

Such indwelling needles generally consist of a flexible outer tube and a rigid inner needle that is slidably inserted into the outer tube.
The tip of the inner needle is set to slightly protrude from the outer tube.

With such an indwelling needle, the sharp tip of the inner needle is inserted into a blood vessel, the inner tube is pulled out from the outer needle, and blood is introduced or drawn out through the outer needle.

However, with conventional indwelling needles, when the needle tip of the inner needle is inserted, the inner needle receives a reaction from the insertion force, and the tip of the inner needle slides back to the tip of the outer needle, causing the inner needle to slide back to the tip of the outer needle. The sharp part of the needle is hidden behind the tip of the outer needle, making it difficult or impossible to easily insert it into the blood vessel, causing various inconveniences such as causing pain to the patient.

The present invention has been devised to improve these conventional disadvantages.

An embodiment of the present invention will be described below with reference to the accompanying drawings.
First, in Figures 1 to 3, 1 is a flexible outer needle;
Reference numeral 2 denotes a base tube portion of this outer needle 1, and this base tube portion 2 is not particularly limited to this, but in this embodiment, it includes a relatively soft tube 3 such as PVC, and a distal end of this tube. It consists of a flexible wing 4.4 fixed to the rear end, a connector 5 inserted and fixed to the rear end, and a rubber bleed stopper 6 fitted to the opening of the connector 5. .

In this way, the rigid inner needle 7 is slidably inserted into the outer needle 1 by passing through the bleed stopper 6, and the tip of the inner needle is made to slightly protrude from the tip of the outer needle 1, and the inner needle 7 One end of a band 9 is fixed to the needle hub 8, and a hook 1 is attached to the other end of the band 9 at a position corresponding to the wing 4.4.
0 is set.

The band 9 is made of a flexible material that does not easily deform or stretch due to tensile force, and the hook 10 is rectangular in the embodiment shown in FIGS. 1 to 3. It is a frame body.

However, in the case of such an embodiment, after the wings 4°4 are overlapped as shown in FIG.
When inserted into these wings 4, 4, the needle base 8 of the inner needle 7 becomes locked to the base tube part 2, and if the inner needle 7 is punctured in this state, the inner needle 7 will slide with the outer needle 1 due to the reaction force. There is no possibility that the needle will move backward, and the outer needle 1 will be punctured smoothly.

On the other hand, FIGS. 1 and 4 to 6 show other embodiments of the present invention, in which the tip of the band 9 is made into a T-shape and used as a hook 10, and the band 9 is held by wings 4, 4. At the same time, the T-shaped hooking portion 10 is hooked to the front side line of the wings 4, 4, and the same effect as in the above embodiment can also be obtained.

According to the present invention as explained above, even if a reaction force is generated on the inner needle when puncturing the indwelling needle into the body, the movement of the inner needle is prevented from moving through the band and the locking part to the base tube of the outer needle. Since the inner needle is restrained by wings fixed to the inner needle, it does not easily slide back.

Therefore, puncture can be performed with the tip of the inner needle reliably protruding from the tip of the outer needle, so the operation can be performed smoothly and without causing pain to the patient.

Furthermore, according to the present invention, the existing wings are used to fix the band to the needle base of the inner needle, and the band is simply formed with a locking part to the wings, so that the needle of the conventional inner needle is not required. Various excellent effects can be obtained, such as the fact that it can be manufactured easily and inexpensively by just making some changes to the base.

[Brief explanation of the drawing]

The attached drawings all show embodiments of the present invention.
The figure is a partial sectional view, and Figure 2 is a front view showing the state of use.
FIG. 3 is a plan view, FIG. 4 is a partial sectional view showing another embodiment, FIG. 5 is a front view showing the state in which FIG. 4 is used, and FIG. 6 is a plan view. In the figure, 1 is the outer needle, 2 is the outer needle base, 3 is the tube, 4 is the wing, 5 is the connector, 6 is the bleed stopper, 7 is the inner needle, 8 is the needle base, 9 is the band, and 10 is the hook. Each stop is shown.

Claims (1)

[Scope of utility model registration request] In an indwelling needle consisting of a flexible outer needle and a rigid inner needle that is slidably inserted into the outer needle, the outer needle is provided with wings at its base, and the needle base of the inner needle is An indwelling needle, characterized in that one end of a band is fixed to the band, and a portion for hooking to the wing is provided at a position corresponding to the wing of the band.