WO2024181366A1

WO2024181366A1 - Fixed-needle injector

Info

Publication number: WO2024181366A1
Application number: PCT/JP2024/006840
Authority: WO
Inventors: 正朗樹柴
Original assignee: テルモ株式会社
Priority date: 2023-03-01
Filing date: 2024-02-26
Publication date: 2024-09-06

Abstract

The purpose of the present invention is to provide a fixed-needle injector comprising a safety mechanism that is stably connected to an injector and does not easily separate from a needle body. A fixed-needle injector 2 comprises: an injector 3 that has an outer cylinder 31, a needle fixation part 32 that is provided to a tip part of the outer cylinder 31, and a needle body 33 that is fixed to the needle fixation part 32; and a safety mechanism 4 that is connected to the injector 3 and is supported so as to be capable of rotating relative to the outer cylinder 31 around an axis A2 that intersects the extension direction A1 of the needle body 33. The safety mechanism 4 has a sheath 42 that rotates relative to the outer cylinder 31 to cover the needle body 33. The sheath 42 has an engagement part that rotates relative to the outer cylinder 13 to engage the needle fixation part 32.

Description

Recessed Needle Syringe

The present invention relates to a needle-embedded syringe in which the needle body is embedded.

　Generally, there are embedded-needle syringes in which the needle body is embedded and fixed at the tip of the outer cylinder. In medical settings, there is a risk of infection after use of an embedded-needle syringe due to needlestick injuries, etc., in which medical personnel are injured by the needle body contaminated with bodily fluids. To prevent needlestick injuries, etc. from occurring after use of an embedded-needle syringe, it is desirable to protect the needle body.

Patent document 1 discloses a needle protection device that protects the needle of a syringe. In the needle protection device described in patent document 1, the housing rotates relative to the syringe and the needle passes through a slot in the housing, causing the housing to cover and protect the needle. At this time, a hook on the housing grips the needle. At the same time, the housing is held to the collar by the interaction between a catch on the housing and a finger on a collar attached to the syringe.

However, in the needle protection device described in Patent Document 1, the catch and finger are provided near the hinge via the hinge. Therefore, the catch or finger, which functions as the point of action, is very close to the hinge, which functions as the fulcrum, and there is a problem that the housing is easily detached from the needle by a force applied, for example, from a direction intersecting the direction in which the needle extends. Safety mechanisms such as needle protection devices are required to be stably connected to the syringe and not easily detached from the needle body.

Patent No. 5315314

The present invention was made in consideration of the above circumstances, and aims to provide a needle-embedded syringe equipped with a safety mechanism that is stably connected to the syringe and does not easily come off the needle body.

The present invention relates to (1) an embedded-needle syringe with an embedded needle body, comprising: an outer tube, a needle embedding section provided at the tip of the outer tube, and a needle body embedded and fixed in the needle embedding section; and a safety mechanism connected to the syringe and supported rotatably relative to the outer tube about an axis intersecting the direction in which the needle body extends, the safety mechanism having a sheath that rotates relative to the outer tube to cover the needle body, and the sheath having an engagement section that engages with the needle embedding section by rotating relative to the outer tube.

According to the above-mentioned (1) embedded needle syringe, the needle body of the syringe is embedded and fixed in the needle embedding part provided at the tip of the outer tube. The safety mechanism is connected to the syringe and supported rotatably with respect to the outer tube around an axis intersecting with the direction in which the needle body extends. The safety mechanism also has a sheath that rotates with respect to the outer tube to cover the needle body. As a result, the needle body is covered and protected by the sheath of the safety mechanism. The sheath also has an engagement part that engages with the needle embedding part by rotating with respect to the outer tube. In other words, the engagement part of the sheath engages with the needle embedding part provided at the tip of the outer tube by rotating the sheath with respect to the outer tube. Therefore, the engagement part that functions as the point of action is located relatively far from the rotation axis of the sheath that functions as the fulcrum. As a result, the safety mechanism is stably connected to the syringe and does not easily come off from the needle body even when it receives a force, for example, from a direction intersecting with the direction in which the needle body extends. The sheath of the safety mechanism can stably cover and protect the needle body.

(2) In the embedded needle syringe of (1) above, it is preferable that the safety mechanism further includes a connector that is attached to the outer cylinder and supports the sheath rotatably relative to the outer cylinder around the axis.

　With the embedded needle syringe of (2) above, the connector of the safety mechanism can stably support the sheath relative to the barrel, rotatably around an axis that intersects with the extension direction of the needle body, while being stably attached to the barrel of the syringe.

(3) In the embedded needle syringe of (2) above, it is preferable that one of the outer tube and the connector has a groove, and the other of the outer tube and the connector has a protrusion that fits into the groove, and the connector is attached to the outer surface of the outer tube by fitting the protrusion into the groove.

The embedded needle syringe described above in (3) prevents the connector from easily coming off the barrel of the syringe, and allows the connector to be stably attached to the outer surface of the barrel.

(4) In the embedded needle syringe of (1) above, it is preferable that one of the outer tube and the sheath has a recess, and the other of the outer tube and the sheath has a protrusion that fits into the recess, and the sheath is supported by the outer tube so as to be rotatable relative to the outer tube around the axis by the protrusion fitting into the recess.

In the embedded needle syringe of (4) above, the convex portion fits into the concave portion, so that the sheath is supported by the outer tube so as to be rotatable relative to the outer tube around an axis that intersects with the direction in which the needle body extends. Therefore, the sheath is directly supported by the outer tube and can rotate stably relative to the outer tube. In addition, because there is no need for components such as a connector to connect the sheath and the outer tube, the number of parts in the safety mechanism can be reduced.

(5) In the embedded needle syringe described in any one of (1) to (4) above, it is preferable that the engagement portion has one or more claw portions that engage with the embedded needle portion.

In the above-mentioned (5) embedded needle syringe, the engagement portion engages with the needle embedding portion provided at the tip of the outer cylinder by one or more claw portions. This prevents the sheath from easily coming off the needle embedding portion. This allows the sheath to more stably cover and protect the needle body.

(6) In the embedded needle syringe described in any one of (1) to (5) above, it is preferable that the engagement portion is a first engagement portion, and the sheath further has a second engagement portion that engages with the needle body by rotating relative to the outer cylinder.

In the above-mentioned (6) embedded needle syringe, the sheath engages with the needle embedding portion provided at the tip of the outer cylinder at the first engagement portion, and engages with the needle body at the second engagement portion. This prevents the sheath from easily coming off the needle embedding portion and the needle body. This allows the sheath to more stably cover and protect the needle body.

(7) In the embedded needle syringe of (6) above, it is preferable that the second engagement portion engages with the center of the needle body in the direction in which the needle body extends.

In the above-mentioned (7) embedded needle syringe, the sheath engages with the needle embedding portion and the needle body by the first engagement portion and the second engagement portion that are separated from each other in the direction in which the needle body extends. This makes it possible to more reliably prevent the sheath from coming off the needle embedding portion and the needle body. This allows the sheath to more stably cover and protect the needle body.

The present invention provides an embedded needle syringe equipped with a safety mechanism that is stably connected to the syringe and does not easily come off the needle body.

1 is a perspective view showing a first embodiment of a needle-embedded syringe according to the present invention; FIG. 1 is a plan view showing a state before a sheath covers a needle body in a needle-embedded syringe according to a first embodiment. FIG. 1 is a plan view showing a state after the sheath covers the needle body in the embedded needle syringe according to the first embodiment. FIG. FIG. 2 is a perspective view showing a state in which the sheath of the first embodiment covers the needle body. FIG. 2 is a plan view showing a sheath according to the first embodiment. 1 is a perspective view illustrating a state in which the connector of the first embodiment is attached to an outer tube. FIG. FIG. 2 is a plan view showing the syringe of the first embodiment. FIG. 8 is an enlarged perspective view of an area A11 shown in FIG. 7. 1 is a perspective view illustrating a connector according to a first embodiment. FIG. 11 is a perspective view showing a second embodiment of a needle-embedded syringe according to the present invention. FIG. 11 is a perspective view showing a state in which the sheath of the second embodiment covers the needle body. FIG. 11 is an enlarged perspective view of the vicinity of a needle embedding portion of a second embodiment. FIG. 11 is a perspective view showing a sheath according to a second embodiment.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.
The embodiments described below are preferred specific examples of the present invention, and therefore various technically preferable limitations are applied to them, but the scope of the present invention is not limited to these aspects unless otherwise specified in the following description to the effect that the present invention is limited to them. In addition, in each drawing, similar components are given the same reference numerals, and detailed descriptions thereof are omitted as appropriate.

FIG. 1 is a perspective view showing a needle-embedded syringe according to a first embodiment of the present invention.
FIG. 2 is a plan view showing the embedded-needle syringe according to the first embodiment in a state before the needle body is covered by the sheath.
FIG. 3 is a plan view showing the state after the sheath covers the needle body in the embedded needle syringe according to the first embodiment.

The embedded needle syringe 2 according to the first embodiment comprises a syringe 3 and a safety mechanism 4. The syringe 3 has an outer cylinder 31, a needle embedded portion 32, and a needle body 33. The outer cylinder 31 contains a medicinal solution to be injected into the body, blood drawn from the body, etc. The needle embedded portion 32 is provided at the tip of the outer cylinder 31, and fixes the needle body 33. The needle embedded portion 32 shown in FIG. 1 has a structure in which four ribs extend radially outward. However, the structure of the needle embedded portion 32 is not limited to this, and it may have three or fewer ribs or five or more ribs extending radially outward, or may be cylindrical.

The needle body 33 is embedded and fixed in the needle embedding portion 32. In other words, the syringe 3 of the first embodiment is a needle-embedded type syringe in which the needle body 33 is embedded and fixed in the needle embedding portion 32 provided at the tip of the outer tube 31.

As shown in Figures 1 and 2, the safety mechanism 4 is connected to the syringe 3 and is supported rotatably relative to the outer tube 31 about an axis A2 that intersects with the direction A1 in which the needle body 33 extends. Specifically, the axis A2 is perpendicular to the direction A1 in which the needle body 33 extends. The safety mechanism 4 has a connector 41 and a sheath 42. Note that, as will be described later with reference to Figures 10 to 13, the safety mechanism does not necessarily have to have a connector. In the first embodiment, a case in which the safety mechanism 4 has a connector 41 is exemplified.

As shown in Figs. 1 to 3, the connector 41 is attached to the outer surface of the outer tube 31 near the needle embedding portion 32. A specific example of how the connector 41 is attached to the outer surface of the outer tube 31 will be described later. The connector 41 supports the sheath 42 so that it can rotate with respect to the outer tube 31. In other words, the sheath 42 is supported by the connector 41 so that it can rotate with respect to the outer tube 31. In other words, the sheath 42 is supported by the connector 41 and can rotate with respect to the outer tube 31 around the axis A2 as shown by the arrows A3 and A4 in Fig. 2. As shown in Fig. 3, the sheath 42 covers and protects the needle body 33 by rotating in the direction of the arrow A3 in Fig. 2 around the axis A2. On the other hand, as shown in Fig. 2, the sheath 42 can also expose the needle body 33 by rotating in the direction of the arrow A4 in Fig. 2 around the axis A2.

FIG. 4 is a perspective view showing a state in which the sheath of the first embodiment covers the needle body.
FIG. 5 is a plan view showing the sheath of the first embodiment.
FIG. 4 is an enlarged view of the vicinity of the needle embedding portion as viewed in the direction of arrow A5 shown in FIG.

4 and 5, the sheath 42 has an engagement portion 421. The engagement portion 421 of the first embodiment is an example of the "first engagement portion" of the present invention. The engagement portion 421 has two

claw portions

421a, 421b extending from the inner wall toward the housing portion 423 that houses the needle body 33. The

claw portions

421a and 421b are provided in positions facing each other. The distance L2 between the

claw portions

421a and 421b is the same as the width L1 of the needle embedded portion 32, or is slightly shorter than the width L1 of the needle embedded portion 32. Here, the width L1 refers to the length of the needle embedded portion 32 in a direction intersecting (specifically perpendicular to) the direction A1 in which the needle body 33 extends.

As a result, as shown in Fig. 4, when the sheath 42 rotates about the axis A2 in the direction of the arrow A3 shown in Fig. 2, the engagement portion 421 engages with the needle embedding portion 32. Specifically, when the sheath 42 rotates about the axis A2 in the direction of the arrow A3 shown in Fig. 2, the needle embedding portion 32 fits into the gap between the claw portion 421a and the claw portion 421b.

Also, as shown in Figs. 4 and 5, the sheath 42 has an engagement portion 422. The engagement portion 422 of the first embodiment is an example of a "second engagement portion" of the present invention. Similar to the engagement portion 421 described above, the engagement portion 422 extends from the inner wall toward the storage portion 423. As shown in Fig. 4, when the sheath 42 rotates in the direction of the arrow A3 shown in Fig. 2 about the axis A2, the engagement portion 422 engages with the needle body 33. Specifically, as shown in Fig. 4, the engagement portion 422 engages with the center of the needle body 33 in the direction A1 in which the needle body 33 extends.

In this way, the sheath 42 rotates in the direction of the arrow A3 shown in Figure 2 around the axis A2, thereby engaging with the needle embedding portion 32 at the engaging portion 421 and engaging with the central portion of the needle main body 33 at the engaging portion 422.
The engaging portion 421 does not necessarily have to have a plurality of claws, and may have one claw. In this case, it is desirable that one claw (e.g., claw 421b) of the engaging portion 421 is provided at a position facing the engaging portion 422.

FIG. 6 is a perspective view illustrating a state in which the connector of the first embodiment is attached to an outer cylinder.
FIG. 7 is a plan view showing the syringe of the first embodiment.
FIG. 8 is an enlarged perspective view of an area A11 shown in FIG.
FIG. 9 is a perspective view illustrating the connector of the first embodiment.
For ease of explanation, the sheath 42 is omitted in Fig. 6. Also, for ease of explanation, the needle body 33 is omitted in Fig. 7.

As described above with reference to Figures 1 to 3, the connector 41 is attached to the outer surface of the outer tube 31 near the needle embedding portion 32. As shown in Figure 8, a plurality of protrusions 312 are provided on the outer surface 311 of the outer tube 31 near the needle embedding portion 32. The protrusions 312 protrude radially outward from the outer surface 311 of the outer tube 31. As a result, grooves 313 are formed between adjacent protrusions 312. The grooves 313 may be recesses formed on the outer surface 311 of the outer tube 31 between adjacent protrusions 312, or may be gaps between adjacent protrusions 312.

As shown in FIG. 9, the connector 41 has a shape similar to, for example, a C-ring. A number of protrusions 412 are provided on the inner surface of the connector 41. The protrusions 412 protrude radially inward from the inner surface of the connector 41. As a result, grooves 413 are formed between adjacent protrusions 412. The grooves 413 may be recesses formed on the inner surface of the connector 41 between adjacent protrusions 412, or may be gaps between adjacent protrusions 412.

6, when the connector 41 is attached to the outer surface of the outer tube 31 near the needle embedding portion 32, the protrusion 412 of the connector 41 fits into the groove 313 of the outer tube 31. Also, when the connector 41 is attached to the outer surface of the outer tube 31 near the needle embedding portion 32, the protrusion 312 of the outer tube 31 fits into the groove 413 of the connector. In this way, the protrusion 412 of the connector 41 fits into the groove 313 of the outer tube 31, or the protrusion 312 of the outer tube 31 fits into the groove 413 of the connector, so that the connector 41 is attached to the outer surface 311 of the outer tube 31. This prevents the connector 41 from easily coming off the outer tube 31, and allows the connector 41 to be stably attached to the outer surface 311 of the outer tube 31.

As shown in FIG. 9, the connector 41 has a hole 411 formed along an axis A2 that intersects with the direction A1 in which the needle body 33 extends. On the other hand, as shown in FIG. 5, the sheath 42 has an axis portion 424 formed along an axis A2 that intersects with the direction A1 in which the needle body 33 extends. As shown in FIGS. 1 to 3, the axis portion 424 of the sheath 42 fits into the hole 411 of the connector 41, whereby the sheath 42 is attached to the connector 41 and is supported by the connector 41 so as to be rotatable around the axis A2 relative to the outer tube 31.

In the needle-embedded syringe 2 according to the first embodiment, the engagement portion 421 of the sheath 42 engages with the needle-embedded portion 32 provided at the tip of the outer tube 31 by rotating the sheath 42 in the direction of the arrow A3 shown in FIG. 2 relative to the outer tube 31. Therefore, the engagement portion 421 functioning as the point of action is located relatively far from the axis A2 of rotation of the sheath 42 functioning as the fulcrum. Specifically, the portion where the engagement portion 421 of the sheath 42 engages with the needle-embedded portion 32 is far from the portion where the sheath 42 is connected to the connector 41 (i.e., the shaft portion 424 of the sheath 42) toward the tip side in the direction A1 in which the needle body 33 extends. As a result, the safety mechanism 4 of the first embodiment is stably connected to the syringe 3 and does not easily come off from the needle body 33 even if a force is applied from a direction intersecting the direction A1 in which the needle body 33 extends. The sheath 42 of the safety mechanism 4 can stably cover and protect the needle body 33.

In addition, the connector 41 of the first embodiment can stably support the sheath 42 relative to the outer cylinder 31 around the axis A2 while being stably attached to the outer cylinder 31 of the syringe 3.

As described above with reference to Figures 4 and 5, the sheath 42 of the first embodiment rotates about axis A2 in the direction of arrow A3 shown in Figure 2, and engages with the needle embedding portion 32 at an engagement portion 421 having two

claw portions

421a, 421b provided at positions facing each other. This prevents the sheath 42 from easily coming off the needle embedding portion 32. Therefore, the sheath 42 can stably cover and protect the needle main body 33.

In addition, the sheath 42 of the first embodiment rotates in the direction of arrow A3 shown in FIG. 2 about axis A2, thereby further engaging with the center of the needle body 33 at the engaging portion 422. Therefore, the sheath 42 engages with the needle embedded portion 32 and the needle body 33 by the engaging

portions

421 and 422, which are separated from each other in the direction A1 in which the needle body 33 extends. This makes it possible to more reliably prevent the sheath 42 from coming off the needle embedded portion 32 and the needle body 33. Therefore, the sheath 42 can cover and protect the needle body 33 more stably.

Next, a second embodiment of the present invention will be described.
In addition, in cases where the components of the embedded needle syringe 2A according to the second embodiment are similar to the components of the embedded needle syringe 2 according to the first embodiment described above with reference to Figures 1 to 9, duplicated explanations will be omitted as appropriate, and the following explanation will focus on the differences.

FIG. 10 is a perspective view showing a second embodiment of a needle-embedded syringe according to the present invention.
FIG. 11 is a perspective view showing a state in which the sheath of the second embodiment covers the needle body.
FIG. 12 is an enlarged perspective view of the vicinity of the needle embedding portion of the second embodiment.
FIG. 13 is a perspective view showing a sheath according to the second embodiment.
FIG. 11 is an enlarged view of the vicinity of the needle embedded portion viewed in the direction of arrow A6 shown in FIG.

The embedded needle syringe 2A according to the second embodiment includes a syringe 3A and a safety mechanism 4A. The syringe 3A includes an outer tube 31A, a needle embedded portion 32, and a needle body 33. As shown in FIG. 12, the outer tube 31A has a recess 314 provided near the needle embedded portion 32. The recess 314 may be a hole penetrating the outer tube 31A as long as it is a hole that does not reach the flow path of the drug solution, or may be a hole or groove that does not penetrate the outer tube 31A. The recess 314 is formed along an axis A2 that intersects with the direction A1 in which the needle body 33 extends. In other words, the direction in which the recess 314 extends intersects (specifically, perpendicular to) the direction A1 in which the needle body 33 extends. The needle embedded portion 32 and the needle body 33 are as described above with reference to FIGS. 1 to 9.

The safety mechanism 4A is connected to the syringe 3A and is supported to be rotatable relative to the outer tube 31A around an axis A2 that intersects with the direction A1 in which the needle body 33 extends. The safety mechanism 4A has a sheath 42A, but does not have the connector 41 described above with reference to Figures 1 to 9. The sheath 42A is supported by the outer tube 31A to be rotatable relative to the outer tube 31A around the axis A2.

Specifically, as shown in FIG. 13, the sheath 42A has two protrusions 425 extending from the inner wall toward the housing portion 423 that houses the needle body 33. The protrusions 425 extend from the inner wall toward the housing portion 423 and are formed along an axis A2 that intersects with the direction A1 in which the needle body 33 extends. The two protrusions 425 are provided at positions facing each other. As shown in FIG. 10 and FIG. 11, the protrusions 425 of the sheath 42A fit into the recesses 314 of the outer tube 31A, so that the sheath 42A is supported by the outer tube 31A so as to be rotatable relative to the outer tube 31A around the axis A2. The rest of the structure is the same as that of the embedded-needle syringe 2 according to the first embodiment described above with reference to FIG. 1 to FIG. 9.

In the implantable needle syringe 2A according to the second embodiment, the convex portion 425 of the sheath 42A fits into the concave portion 314 of the outer tube 31A, so that the sheath 42A is supported by the outer tube 31A so as to be rotatable about the axis A2 relative to the outer tube 31A. Therefore, the sheath 42A is directly supported by the outer tube 31A and can rotate stably relative to the outer tube 31A. In addition, because there is no need for a connector or other member to connect the sheath 42A and the outer tube 31A, the number of parts in the safety mechanism 4A can be reduced. In addition, the same effects as those described above with reference to Figures 1 to 9 can be obtained.

In the second embodiment, the case where the sheath 42A has a convex portion 425 and the outer tube 31A has a concave portion 314 is given as an example. However, this is not limited to this, and the sheath 42A may have a concave portion and the outer tube 31A may have a convex portion that fits into the concave portion of the sheath 42A. Even in this case, the convex portion of the outer tube 31A fits into the concave portion of the sheath 42A, so that the sheath 42A is supported by the outer tube 31A so as to be rotatable relative to the outer tube 31A around the axis A2.

The above describes an embodiment of the present invention. However, the present invention is not limited to the above embodiment, and various modifications can be made without departing from the scope of the claims. The configurations of the above embodiment can be partially omitted or arbitrarily combined in a manner different from that described above.

2: Recessed needle syringe, 2A: Recessed needle syringe, 3: Syringe, 3A: Syringe, 4: Safety mechanism, 4A: Safety mechanism, 31: Outer tube, 31A: Outer tube, 32: Recessed needle section, 33: Needle body, 41: Connector, 42: Sheath, 42A: Sheath, 311: Outer surface, 312: Projection, 313: Groove, 314: Recess, 411: Hole, 412: Projection, 413: Groove, 421: Engagement section, 421a: Claw section, 421b: Claw section, 422: Engagement section, 423: Storage section, 424: Shaft, 425: Convex section

Claims

A needle-embedded syringe having an embedded needle body,
a syringe having an outer cylinder, a needle embedding portion provided at a tip portion of the outer cylinder, and a needle body embedded and fixed in the needle embedding portion;
a safety mechanism connected to the syringe and supported rotatably with respect to the outer cylinder about an axis intersecting a direction in which the needle body extends;
Equipped with
the safety mechanism has a sheath that rotates relative to the outer cylinder to cover the needle body,
The sheath has an engagement portion that rotates relative to the outer cylinder to engage with the needle embedding portion.
The embedded needle syringe according to claim 1, characterized in that the safety mechanism further includes a connector that is attached to the outer cylinder and supports the sheath rotatably relative to the outer cylinder around the axis.
One of the outer cylinder and the connector has a groove,
the other of the outer tube and the connector has a protrusion that fits into the groove,
The embedded needle syringe according to claim 2, wherein the connector is attached to the outer surface of the barrel by fitting the protrusion into the groove.
One of the outer cylinder and the sheath has a recess,
the other of the outer cylinder and the sheath has a protrusion that fits into the recess,
2. The embedded needle syringe according to claim 1, wherein the sheath is supported by the outer cylinder so as to be rotatable relative to the outer cylinder about the axis by fitting the convex portion into the concave portion.
The embedded needle syringe according to claim 1, characterized in that the engagement portion has one or more claw portions that engage with the embedded needle portion.
The engagement portion is a first engagement portion,
The embedded needle syringe according to any one of claims 1 to 5, characterized in that the sheath further has a second engagement portion that engages with the needle body by rotating relative to the outer cylinder.
The embedded needle syringe according to claim 6, characterized in that the second engagement portion engages with the center of the needle body in the direction in which the needle body extends.