JPH0521587B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a double needle for drug injection, which allows the puncturing direction to be changed within a predetermined region by one puncturing.

[Conventional technology]

As a conventional double needle for drug injection, for example, the sixth
There are those shown in Figures a, b, and c. This double needle for drug injection has an inner needle 1 and an outer needle 2 having cutting edges 1a and 2a, respectively, and the inner and outer needles 1 and 2 are fixed to needle bases 3 and 4. FIG. 6a shows the dual needle structure, and FIGS. 6b and 6c show the inner and outer needles 1 and 2 separated.

According to this double needle for drug injection, 2 in Fig. 6a
When the heavy needle is used to puncture an affected area of the human body, a syringe barrel (not shown) fixed to the needle base 3 of the inner needle 1 can inject a medicinal solution into the affected area. On the other hand, if the inner needle 1 is removed to create the state shown in FIG. 6b and the syringe barrel is fixed to the needle base 4 of the outer needle 2, a large amount of drug solution can be injected in a predetermined period of time.

[Problem that the invention seeks to solve]

However, with conventional double needles for injecting drug solutions, when you want to inject drugs into multiple affected areas or change the affected area where you want to inject the drug solution, you have to puncture each site, which causes pain to the patient. This has the disadvantage of increasing .

[Means for solving problems]

The present invention has been made in view of the above, and in order to make it possible to inject a drug solution into multiple affected areas or change the affected area to which the drug solution is injected without increasing the pain caused to the patient, the needle base of the outer needle is changed. The inner needle has a supporting outer needle main body, and an inner needle main body that is slidably provided inside the outer needle main body and supports the needle base of the inner needle, and the inner needle is bent based on residual strain. , has a longer length than the outer needle, and when the inner needle body slides and protrudes from the outer needle, it bends due to residual strain, and when it is located inside the outer needle, it bends due to the rotation of the inner needle body. Therefore, the present invention provides a double needle for drug liquid injection having a distal end portion which rotatably contacts the inner wall surface of the outer needle and whose curved shape is regulated to a substantially straight line.

Hereinafter, the double needle for drug injection of the present invention will be explained in detail.

〔Example〕

FIG. 1 shows an embodiment of the present invention, in which a cutting edge 1 is fixed to a needle base 3 and is bent based on residual strain.
The inner needle 1 has a length that protrudes from the cutting edge 2a of the outer needle 2 fixed to the needle base 4, and as will be described later, when it protrudes a predetermined length, it deforms due to residual strain. It's starting to curve. The needle base 4 of the outer needle 2 is transparent, and a measuring mark 5 is engraved on the main body 4a, and a reference mark 6 is provided on the end 4b. On the other hand, angle marks 7 are engraved on the needle base 3 of the inner needle 1 at predetermined angles.

In the above configuration, the operation will be explained based on FIGS. 2a, b, and c as follows.

In Fig. 2a, when the cutting edge 1a of the inner needle 1 protrudes from the cutting edge 2a of the outer needle 2 by a predetermined length L (for example, 25 mm), the tip of the inner needle 1 is deformed and bent by the residual strain applied to the tip. , the cutting edge 1a is at a position r from the center line.

In Fig. 2b, the cutting edge 1a of the inner needle 1 is connected to the outer needle 2.
When the inner needle 1 is pulled into the inner needle 1, the inner needle 1 becomes approximately straight due to its elastic deformation. At this time, the inner needle 1 is rotated 180 degrees based on the angle mark 7 on the needle base 3 and the reference mark 6 on the end portion 4b of the needle base 4.

In Fig. 2c, when the inner needle 1 is again projected by a predetermined length L from the cutting edge 2a of the outer needle 2, the cutting edge 1a
It comes to the position r in the opposite direction from the center line. Protrusion amount L
This adjustment can be made by checking the position of the tip 3a of the needle hub 3 using the measuring mark 5.

FIG. 3 shows that by the above-described operation, a medicinal solution can be injected into any position in a circular region 10 with a diameter 2r centered on the cutting edge 2a by one puncture.

Figures 4a and 4b show a second embodiment of the invention,
A groove 12 is provided on the inner wall of the needle base 4 of the outer needle 2. Further, the needle base 3 of the inner needle 1 is provided with projections 13 that can be elastically deformed at, for example, 90° intervals.

In the above configuration, the needle base 3 is positioned inside the needle base 4, the needle base 3 is rotated by a predetermined angle while the protrusion 13 is fitted into the groove 12, and then the protrusion 13 is pushed in. It advances inside the needle base 4 while being compressed, and is fitted into the groove 11 and locked. At this time, the cutting edge 1a of the inner needle 1 protrudes by a predetermined length L from the cutting edge 2a of the outer needle 2. Here, the height of the protrusion 13 and the depth of the grooves 11 and 12 are set so that the strength of the fit between the protrusion 13 and the groove 11 is relatively high, and the strength of the fit between the protrusion 13 and the groove 12 is slightly smaller than that. has been done.

Figures 5a, b, and c show a third embodiment of the present invention, in which the needle base 4 of the outer needle 2 is a regular square, with an open part 14 on one side and an angle on the other side. It has a slit 15 that serves as a reference mark, and further has a mark 18 that serves as a reference point. On the other hand, the needle base 3 of the inner needle 1 has a square portion 3A and a circular portion 3B to which a syringe barrel (not shown) is attached. part 3
A measuring mark 16 is provided at part A, and by matching a reference mark 17 at part 3B, a correspondence relationship serving as a reference for the inner and outer needles 1 and 2 is obtained. Next, when the needle base 3 is pulled and its tip reaches the open part 14 of the needle base 4,
When the needle base is rotated, the needle base 4 is deformed as shown in FIG. 5, and the needle base 3 can be easily rotated through 90 degrees, 180 degrees, and 270 degrees. Thereafter, by aligning the measuring mark 16 with the reference point 18 of the needle base 4 and pushing it in, the cutting edge 1a of the inner needle 1 can be made to protrude by a predetermined length L from the cutting edge 2a of the outer needle 2.

〔Effect of the invention〕

As explained above, according to the double needle for drug injection of the present invention, the inner needle is bent by residual strain and the rotatable inner needle is rotated at a predetermined angle with the tip of the inner needle retracted into the outer needle. Because the needle is made to protrude from the outer needle again after the injection, the drug can be injected into multiple affected areas or the affected area to be injected can be changed without increasing the pain caused to the patient with a single puncture of the outer needle. .

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing one embodiment of the present invention, and FIG.
Figures a, b, and c are enlarged cross-sectional views of the main parts of Figure 1, Figure 3 is an explanatory diagram showing the chemical injection area, and Figures 4 a and b illustrate a second embodiment of the present invention. Explanatory drawings FIGS. 5a, 5b, and 5c are explanatory drawings showing a third embodiment of the present invention. FIGS. 6a, 6b, and 6c are explanatory diagrams showing a conventional double needle for liquid injection. Explanation of symbols, 1...Inner needle, 1a...Blade tip, 2...
...Outer needle, 2a...Blade tip, 3...Inner needle base, 3a...
... Tip part of the needle base 3, 3A... Square part of the needle base 3,
3B...Circular part of needle base 3, 4...Outer needle base, 4a
...Body portion of the needle base 4, 4b...End portion of the needle base 4, 5
... Measuring mark, 6 ... Reference mark, 10 ... Chemical injection area, 11, 12 ... Groove, 13 ... Protrusion,
14...opening part, 15...slit, 16...measuring mark, 17...reference mark, 18...reference point.

Claims (1)

[Scope of Claims] 1. A double needle for injecting a drug solution into a predetermined affected area in the body, having an outer needle and an inner needle inserted into the inner needle, comprising: an outer needle that supports the needle base of the outer needle; a needle main body, and an inner needle main body that is slidably provided inside the outer needle main body and supports a needle base of the inner needle, and the inner needle is bent based on residual strain; The inner needle has a longer length than the outer needle, bends based on the residual strain when it protrudes from the outer needle due to sliding of the inner needle main body, and when located inside the outer needle, the inner needle A double needle for drug liquid injection, characterized in that it has a distal end portion which rotatably contacts the inner wall surface of the outer needle and whose curved shape is restricted to a substantially linear shape by rotation of the main body portion.