JP2023067462A - Injection needle - Google Patents

Abstract

To make it possible to reliably prevent a needle from bending and to perform an appropriate subcutaneous puncture.SOLUTION: An injection needle 13 includes a base member 33 having a connection part 31 connected to a cylinder body 12 and a support shaft part 32 projecting forward from the connection part 31, and a needle member 34 held on a shaft center of the support shaft part 32 of the base member 33 and protruding forward. The injection needle is provided with an assist tool 35 having: a slide cylinder part 36 which is inserted in and engaged with the support shaft part 32 and can slide back and forth; a spring part 37 which supports the slide cylinder part 36 around the support shaft part 32 and is energized forward; and a flange part 38 that is positioned in front of an end of the needle member 34 in a normal body at the end of the slide cylinder part 36 and stretches to an outer peripheral side positioned.SELECTED DRAWING: Figure 1

Description

The present invention relates to injection needles, such as those used in insulin pens.

Thin needles bend easily. For this reason, it has been proposed to provide a bending prevention guide as disclosed in Japanese Unexamined Patent Application Publication No. 2002-100001 so that the needle does not bend during puncture or the like.

This configuration is provided with a guide tube that fits and slides on the tip of the outer tube of the syringe, and the tip of the guide tube is provided with an insertion hole through which the needle protrudes. With this configuration, the needle is supported by the insertion hole at the tip of the guide tube, so bending can be prevented.

However, the tip of the needle protrudes from the guide tube. For this reason, the tip of the needle may bend due to contact with other objects.

Patent Literature 2 listed below discloses an injection needle provided with a needle cover that covers the tip of the needle. This injection needle has a mounting member attached to the tip of the syringe main body, a needle cover attached to an extending portion formed at the tip of the mounting member so as to be movable in the axial direction, and a needle cover that can be attached to and detached from the attachment member. and has a cap that covers the needle cover.

The needle cover is cylindrical and has a second inwardly flared locking portion at the proximal end. At the tip of the extending portion to which the needle cover is attached, a locking portion for locking and retaining the second locking portion is formed in a mushroom shape so as to increase in diameter. On the other hand, the distal end portion of the needle cover is formed with a first locking portion projecting radially outward. This first locking portion is a portion that locks with the cap.

That is, locking portions that lock on the back side (rear side) of the first locking portion are protruded at four positions in the circumferential direction at portions corresponding to the first locking portions on the inner peripheral surface of the cap. there is The locking portion of the cap is designed to elastically deform radially to overcome the first locking portion of the needle cover when the cap is forced to move axially. With such a structure, the protrusion of the first engaging portion is small, and the protrusion of the engaging portion of the cap is also small.

In use, when the cap is forcibly removed or withdrawn, the needle cover moves toward the tip of the needle and covers the needle. The needle is covered with a needle cover, which protects it from accidental contact with a cap or the like. Puncture is performed with the needle cover covering the needle. The needle cover retracts as the needle is punctured, and the needle pierces the human body.

Japanese Utility Model Laid-Open No. 3-44651 JP-A-3-139363

However, the needle cover is movable along the extension. Moreover, it is attached movably so as not to interfere with the puncture. For this reason, the needle cover may retreat and the needle tip may be exposed due to contact with other objects after the cap is removed, or vibration when the syringe is moved. In that case, bending and breakage of the needle cannot be prevented.

Also, in the case of an injection needle for an insulin pen, which uses a particularly thin needle, it is required to pierce the skin at a right angle, which is quite difficult. There are a certain number of people who cannot stab straight.

Until now, nothing has been devised to allow puncturing at a right angle, and the patient, who is the user, has no choice but to improve the puncturing technique.

If needles get thinner in the future, more and more people will not be able to pierce straight.

Therefore, it is a main object of the present invention to more reliably prevent the bending of the needle and to facilitate proper puncture under the skin.

Means therefor include a base member having a connection portion connected to the syringe main body and a support shaft portion projecting forward from the connection portion; An injection needle having a protruding needle member, comprising: a slide cylinder portion that is inserted into the support shaft portion and is slidable back and forth; and the slide cylinder portion is supported around the support shaft portion and biased forward. The injection needle is provided with a spring portion and an auxiliary tool having a collar portion which is normally located in front of the tip of the needle member at the tip of the slide cylinder and protrudes to the outer peripheral side.

In this configuration, the slide cylinder portion of the auxiliary tool covers and protects the needle member protruding from the support shaft portion, and this state is maintained by the biasing force of the spring portion. The flange automatically makes the angle of the needle member with respect to the skin a right angle at the time of puncture by bringing the distal end face into contact with the skin as a whole. When the injection needle is moved with respect to the skin while the collar is kept in contact with the skin, the slide cylinder retreats against the urging force, and the needle member sticks straight while maintaining the angle.

According to this aspect of the invention, the needle member is covered by the slide tube portion, and the state is maintained by the spring portion, so that the needle member can be protected even if it comes into contact with something else, and the bending of the needle can be prevented more reliably. can be done. In addition, since the flange formed on the slide cylinder regulates the angle of the needle member with respect to the skin, it prevents the needle member from sticking obliquely or bending in the middle, making it easy for anyone to perform appropriate subcutaneous puncture. can.

Front view of the syringe. Sectional drawing of an injection needle. The front view of the separated state of an injection needle. FIG. 4 is an exploded perspective view of a connecting portion of the assisting device; The top view which shows the front end surface of a collar part. Sectional drawing of a hypodermic needle package. Explanatory drawing which shows an effect|action. The front view of the punctured state. The front view which shows another puncture state. The front view of the injection needle which concerns on another example.

One mode for carrying out the present invention will be described below with reference to the drawings.

The front view of the syringe 11 is shown in FIG. A syringe 11 shown in this figure is an insulin pen, and an injection needle 13 is detachably attached to the tip of a syringe main body 12 .

The injection needle 13 is held by a base member 33 having a connection portion 31 connected to the syringe main body 12 and a support shaft portion 32 projecting forward from the connection portion 31, and the shaft center of the support shaft portion 32 of the base member 33. The support shaft portion 32 is provided with an auxiliary tool 35 .

First, the base member 33 and the needle member 34 will be described.

As shown in FIG. 2, the tip of the syringe body 12 is formed with a male thread 12a for connection, and the base member 33 is formed with a female thread 33a to be screwed onto the male thread. That is, the connecting portion 31 of the base member 33 has a short cylindrical shape with a closed tip, and an internal thread 33a is formed on the inner peripheral surface of the connecting portion 31 . As shown in FIG. 1, a plurality of ridges 31a and grooves 31b extending in the front-rear direction are formed on the outer peripheral surface of the connecting portion 31 at regular intervals along the circumferential direction. The ridge 31a extends halfway rearward from a position flush with the front end surface 31c of the connecting portion 31 .

The tip surface 31c of the connecting portion 31 is flat, and the above-described support shaft portion 32 is formed in the center thereof. The support shaft portion 32 is columnar and has a conical tip. The length of the support shaft portion 32 is long enough to hold the needle member 34, and a part of the aforementioned auxiliary tool 35 is moved back and forth along the longitudinal direction of the support shaft portion 32 to hold the needle. It is the length necessary to expose the member 34 .

The base member 33 having such a shape is made of an appropriate constituent resin.

The needle member 34 is held integrally with the support shaft portion 32 so as to pass through the center of the support shaft portion 32 with the distal end portion 34a and the rear end portion 34b projecting from the support shaft portion. The protruding length of the rear end portion 34b is a length that can be accommodated in the connecting portion 31, and the protruding length of the front end portion 34a is a length suitable for the application. The protruding length of the tip portion 34a is, for example, 4 mm, 6 mm, 8 mm, etc. in the case of an injection needle used for an insulin pen.

Next, the auxiliary tool 35 will be explained.

Although the auxiliary member 35 is made of synthetic resin like the base member 33, the auxiliary member 35 is preferably made of transparent synthetic resin in terms of its function. For example, polycarbonate, polyacetal, etc. can be used.

The auxiliary tool 35 has a slide cylinder portion 36, a spring portion 37, and a collar portion 38, which are integrated. As shown in FIG. 3, the auxiliary tool 35 is integrally connected to the tip surface 31c of the connecting portion 31. As shown in FIG.

The slide tube portion 36 is a portion that protects the needle member 34 , and has a cylindrical shape that is inserted into the support shaft portion 32 and slidable in the longitudinal direction of the support shaft portion 32 . The hardness of the slide tube portion 36 is set so that it does not bend easily. The length of the slide tube portion 36 is longer than the protruding length of the distal end portion 34 a of the needle member 34 and shorter than the protruding length of the support shaft portion 32 . The inner diameter of the slide cylinder portion 36 is set to the extent that a very small clearance is provided between the slide cylinder portion 36 and the support shaft portion 32 so that the slide cylinder portion 36 does not rattle.

The spring portion 37 has a form in which a wire extends spirally with a gap, is formed continuously from the rear end of the slide cylinder portion 36 , and surrounds the support shaft portion 32 in the same manner as the slide cylinder portion 36 . It has a form. That is, the spring portion 37 supports the slide cylinder portion 36 around the support shaft portion 32 and urges it forward.

The biasing force of the spring portion 37 supports the sliding cylinder portion 36 and maintains the pushed state, and is not compressed when the slide cylinder portion 36 is lightly touched, and is compressed when the needle member 34 is intentionally pressed with enough force to pierce the skin. is set to be

The length of the spring portion 37 is such that the distal end portion 34a of the needle member 34 is sufficiently exposed when compressed and contracted.

The spring portion 37 may have a circular cross-section like a normal spring, but the spring portion 37 in this example is a deformed spring, in other words, a square spring. That is, the cross-sectional shape of the helical wire portion, which is the main body of the spring portion 37, is square, that is, square or rectangular. Such a shape has the advantage of being easy to mold.

An annular seat portion 39 having a plate shape is provided at an end portion of the spring portion 37 . The seat portion 39 is a portion of the base member 33 that is fixed to the front end surface 31c of the connection portion 31, and has a through hole 39a at the center thereof, through which the support shaft portion 32 is inserted, as shown in FIG. there is

A locking structure is formed between the lower surface of the seating portion 39 and the tip surface 31c of the connecting portion 31 in order to fix the seating portion 39, which is in surface contact with the tip surface 31c of the connecting portion 31, to the connecting portion 31. As shown in FIG. That is, an engaging claw portion 41 is formed on the lower surface of the seat portion 39, and an engaging hole portion 42 corresponding thereto is formed in the tip end surface 31c of the connecting portion 31. As shown in FIG.

The locking claw portions 41 are formed at two locations sandwiching the center of the through hole 39a. has a claw portion 41b projecting in the outer peripheral direction.

The locking hole portion 42 is sized to receive the locking claw portion 41 and to lock the claw portion 41b.

The locking structure consisting of the locking claw portion 41 and the locking hole portion 42 may be fitted together.

The collar portion 38 is formed on the opposite side of the slide cylinder portion 36 to the spring portion 37 , that is, at the tip of the slide cylinder portion 36 . The shape of the flange portion 38 is a disk-like shape projecting from the slide cylinder portion 36 to the outer peripheral side. The flange 38 is disk-shaped and has a hole 38a at its center through which the needle member 34 protrudes. This hole portion 38 a is circular and has the same size as the inner diameter of the slide cylinder portion 36 .

As described above, since the slide cylinder portion 36 is a portion that protects the needle member 34, the collar portion 38 at the distal end of the slide cylinder portion 36 is urged by the spring portion 37 in a normal state, that is, in a state where the urging force is applied. , located in front of the tip of the needle member 34 . Specifically, at least the distal end surface of the collar portion 38 should be located forward of the distal end of the needle member 34 .

A convex portion 38b is formed on the tip surface of the collar portion 38 . The protrusions 38b are for anti-slip purposes, and are formed in an oval shape in plan view as shown in FIG. are sorted by

The size of the collar portion 38 is set so that when the tip surface is in direct contact with the skin, the sliding cylinder portion 36 extending rearward of the collar portion 38 and the support shaft portion 32 can form a right angle with the skin. be. Specifically, for example, the diameter can be about three to four times the diameter of the support shaft portion 32 .

The injection needle 13 configured as described above is packaged to form an injection needle package 51 as shown in FIG. A needle case 52 and a protective seal 53 are used for packaging.

The needle case 52 is made of synthetic resin and has a cylindrical shape large enough to accommodate the injection needle 13. It has a blocking plate 52a at its front end and a flange 52b protruding outward from its rear end. On the inner peripheral surface of the needle case 52, a regulating means 54 for regulating the position in the front-rear direction is fitted with the protrusion 31a or the groove 31b on the outer peripheral surface of the connection portion 31 of the base member 33 of the injection needle 13. formed.

Specifically, when the injection needle 13 is accommodated with the tip of the collar portion 38 in contact with the blocking plate 52a of the needle case 52, the protrusion 31a and the recessed groove 31b of the connection portion 31 are provided at a portion facing the protrusion 31a and the groove 31b. A fitting structure portion 54a is formed to fit with 31a and groove 31b. Circumferential displacement of the injection needle 13 within the needle case 52 is regulated by the fitting between the projection 31a and the groove 31b and the fitting structure 54a.

Then, in the fitting structure portion 54a, the connection portion 31 is moved toward the closing plate 52a to a position where the tip of the projection 31a of the connection portion 31 contacts with the collar portion 38 in contact with the inner bottom surface of the needle case 52. A blocking contact portion 54b is formed. The contact portion 54b is inclined. When the tip of the ridge 31a abuts against the abutting portion 54b, the connecting portion 31 deeply penetrates into the needle case 52, the sliding cylinder portion 36 retreats, and the needle member 34 is exposed. Collision with the closing plate 52a is prevented.

The opening of the needle case 52 on the flange 52b side is closed with a peelable protective seal 53 . The flange 52b is set at a position close to the rear end of the stored injection needle 13, and the gap between the rear end of the injection needle 13 and the protective seal 53 is made as small as possible. As a result, forward and backward movement of the injection needle 13 within the needle case 52 is suppressed.

The injection needle package 51 and the injection needle 13 as described above are used as follows.

The injection needle package 51 is transported and carried, and the injection needle 13 can be taken out by peeling off the protective seal 53 when necessary. While in the needle case 52 , the injection needle 13 is restricted from moving both in the circumferential direction and forward by the restricting means 54 . Therefore, the needle member 34 can be protected without attaching a needle cap at the time of packaging as in the conventional case, and the number of members can be reduced.

The injection needle 13 taken out of the needle case 52 is connected to the tip of the syringe main body 12 and punctured.

Even if the injection needle 13 tilts and comes into contact with the needle case 52 when taken out of the needle case 52, or if the injection needle 13 comes into contact with another object during handling before puncturing, the protruding portion of the needle member 34 will remain within the sliding cylinder portion 36. covered with Moreover, the rear end side portion of the slide cylinder portion 36 is fitted to the support shaft portion 32 . In addition, since the sliding cylinder portion 36 is pushed forward by the biasing force of the spring portion 37, it is possible to prevent unintentional retreat. Therefore, the needle member 34 is protected from accidental bending or breaking.

In the puncture, the injection needle 13 is moved together with the syringe 11 toward the skin 71 and the needle member 34 is pierced. When the collar portion 38 fully contacts the skin 71 , the needle member 34 is perpendicular to the skin 71 . If the needle member 34 is pierced in this state, the spring portion 37 is contracted and the sliding cylinder portion 36 is retracted, and as shown in FIG. There is no bending. In FIGS. 7 and 8, 72 under the skin is subcutaneous tissue, and 73 is the underlying muscle.

The same applies when the skin 71 is picked up and punctured, and as shown in FIG. 9, the skin can be punctured straight.

Further, since the collar portion 38 is in contact with the skin 71 during puncture, it is possible to prevent the needle member 34 from being pushed too deeply against the skin 71 and the needle member 34 entering too deeply.

After the puncture, the needle member 34 is pulled out after injecting the medicine. At this time, the spring portion 37 of the assisting tool 35 is elastically restored, so that the urging force helps the tool to smoothly pull out straight.

In this way, since the auxiliary tool 35 automatically makes the angle of the needle member 34 to the skin 71 at a right angle during puncture, it is possible to prevent the needle member 34 from obliquely sticking or bending in the middle. Since the puncture is performed by simply applying and pressing the entire collar 38, anyone can easily perform an appropriate subcutaneous puncture. As a result, it is possible to contribute to the reduction in diameter of the needle member.

During this puncture, since the auxiliary tool 35 is transparent, the covered support shaft portion 32 and the needle member 34 can be visually recognized from the outside. Therefore, it is possible to confirm that the needle member 34 is normal compared to the case where the needle member 34 cannot be seen through, and a sense of security can be obtained when the needle member 34 is inserted.

Moreover, since a plurality of protrusions 38b are formed on the distal end surface of the collar 38, it is possible to prevent the collar 38 from accidentally slipping on the surface of the skin 71 during puncture.

Moreover, since the collar portion 38 is disc-shaped and the convex portions 38b are arranged radially, there is no directivity in puncturing. Therefore, desired puncture can be performed regardless of the orientation of the injection needle 13 .

The above configuration is one mode for carrying out the present invention, and the present invention is not limited to the configuration described above.

FIG. 10 shows a front view of an injection needle 13 according to another example. The spiral spring portion 37 in the auxiliary tool 35 for the injection needle 13 is a conical spring.

When the spring portion 37 is formed as a conical spring in this manner, a constant biasing force can be applied during the puncturing process without increasing the biasing force as the puncture is performed.

Although not shown, a guide structure is provided between the inner peripheral surface of the sliding cylinder portion 36 and the outer peripheral surface of the support shaft portion 32 in the auxiliary tool 35 to prevent relative rotation in the circumferential direction and allow sliding in the longitudinal direction. may be formed.

The auxiliary tool 35 and the base member 33 may be integrated by a method other than locking.

DESCRIPTION OF SYMBOLS 11... Syringe 12... Syringe main body 13... Injection needle 31... Connection part 31a... Protrusion 31b... Groove 32... Support shaft part 33... Base member 34... Needle member 35... Auxiliary tool 36... Slide cylinder part 37... Spring part 38... Collar part 38b... Convex part 51... Injection needle package 52... Needle case 54... Regulating means

Claims (7)

A base member having a connecting portion connected to the syringe main body and a support shaft portion projecting forward from the connecting portion, and a needle member held by the axis of the support shaft portion of the base member and projecting forward. A syringe needle comprising
A slide cylinder portion that is inserted into the support shaft portion and can slide back and forth; a spring portion that supports the slide cylinder portion around the support shaft portion and biases the slide cylinder portion forward; 3. An injection needle provided with an auxiliary tool having a collar portion positioned in front of the tip of the needle member and projecting outward. 2. The injection needle according to claim 1, wherein said flange is disc-shaped. 3. The injection needle according to claim 1, wherein a convex portion is formed on the distal end surface of the collar portion. The injection needle according to any one of claims 1 to 3, wherein the spiral wire portion of the spring portion has a rectangular cross-sectional shape. The injection needle according to any one of claims 1 to 4, wherein said spring portion is a conical spring. The injection needle according to any one of claims 1 to 5, wherein said auxiliary tool is transparent. An injection needle package containing an injection needle in a needle case,
A plurality of ridges and grooves extending in the front-rear direction are formed along the circumferential direction on the outer peripheral surface of the connecting portion of the injection needle according to any one of claims 1 to 6,
An injection needle package, in which the projection or groove is fitted on the inner peripheral surface of the needle case, and a restricting means for restricting the position in the front-rear direction is formed.

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