WO1989008468A1

WO1989008468A1 - Syringe and syringe device

Info

Publication number: WO1989008468A1
Application number: PCT/JP1989/000284
Authority: WO
Inventors: Katsuhiko Miyaguchi; Hiromichi Fukasawa; Noboru Anzai; Noboru Ishida; Masato Nishimura; Ichiro Ishii
Original assignee: Terumo Kabushiki Kaisha
Priority date: 1988-03-17
Filing date: 1989-03-16
Publication date: 1989-09-21
Also published as: AU3346989A

Abstract

When a protector for protecting a needle is mounted on said needle, the needle is prevented from stabbing in the body by mistake and when the needle is used, the protector is prevented from being lost and the like. A push member (2) comprising a stringer and a syringe device is provided with a hollow portion (2C) having a length sufficient for housing a needle pipe (4) therein. After the syringe device has been used, at least the hollow portion formed in said push member is separated from the inside of the syringe body (1) and fitted over the needle pipe of a needle pipe assembly (B) mounted on the syringe body to fit a hub (5) comprising said needle pipe assembly or the syringe body in the inner wall of the hollow portion. Not only the push member has a function inherent therein but also after it has been used, it can be used as the protector for the needle pipe. In addition, a sufficient distance can be ensured between the needle pipe and the fingers by means of an opening of the hollow portion of the push member and thus the needle pipe can be safely covered.

Description

Description Title of the Invention "Syringe and Injection Device

• Technical field

The present invention relates to a syringe and an injection device. More specifically, a gasket attached to a distal end of a pusher constituting a syringe is entirely inserted into a syringe body from a proximal end opening thereof. In a syringe that is pushed in so as to make close contact with the circumference, and an injection device having a needle tube assembly attached to the syringe, the pusher is used as a protector that protects the needle tube after use as an injection device. To syringes and injection devices. Background technology

A conventional syringe has a syringe body and, for example, a pusher having a cross-shaped cross section and a gasket attached to the tip of the pusher, and the gasket is connected to a proximal end opening of the syringe body. It is designed to be pushed into the syringe body so as to be in close contact with the entire circumference. Further, a conventional injection device comprises the syringe and a needle tube assembly, the needle tube assembly having a needle tube and a hub supporting a base end thereof, and fitting the hub into a distal end opening of the syringe body. It is configured to wear.

Then, the syringe and the needle tube assembly are not integrally assembled, and each is provided as a separate product, or both are integrally assembled to provide a product as an injection device. I have. this In this case, each of the needle tubes constituting the needle tube assembly provided separately from the syringe and the needle tube assembly of the injection device is covered with a hollow body protector having an open end. More specifically, the needle tube of the needle tube assembly is housed through the opening of the inlet portion of the protector, and the hub of the needle tube assembly is fitted around the inner periphery of the inlet portion of the protector. Then, the protector is removed at the time of use, and after use, the protector is again covered with the needle tube and fitted to the hub, and the entire injection device including the protector is discarded without being separated into the syringe and the needle tube assembly. .

However, since the protector according to the conventional technique has a small opening, it is difficult to fit the needle tip into the opening. In addition, the protector is required to be able to protect the needle tube, but not longer. For this reason, if the needle tip is removed from the opening of the protector when the protector is put on the needle tube after use, the finger holding the protector may be stabbed with the needle tip by mistake. Therefore, there is a risk of blood infection such as AIDS and hepatitis, so urgent measures are required. On the other hand, the protector removed during use had inconveniences such as misplacement, rolling over from the table, and loss. DISCLOSURE OF THE INVENTION · After the syringe and the injection device according to the present invention are used as an injection device, a pusher sufficiently longer than the needle tube is separated from the syringe body, and one end of the pusher is gripped. To the needle tube safely from the opening at the other end, and fit into the hub or syringe body to protect the needle tube. It is an object of the present invention to provide a syringe and an injection device which can be used as one and can be disposed of as a single unit with the entire injection device including the protector without being separated into a syringe and a needle tube assembly.

Another object of the present invention is to provide a syringe body and a pusher having a gasket attached to the distal end thereof. The gasket attached to the distal end of the pusher is inserted into the syringe body from the base opening. In a syringe that is pressed in such a manner that the entire circumference is closely contacted, the presser is formed to have a hollow portion of a required length, and after use, the entire portion or a portion excluding the gasket is separated from the syringe body. In addition, the needle tube of the needle tube assembly attached to the syringe body can be stored in the hollow portion of the pusher from one end opening of the pusher. An object of the present invention is to provide a syringe characterized in that the hub or the body of the syringe is fitted so as to be able to serve as a protector.

Still another object of the present invention is to provide a syringe body and a pusher having a gasket attached to the tip, and a gasket attached to the tip end of the pusher inward from a base end opening of the syringe body. The pusher has a hollow portion of a required length opened from the base end, and is located halfway on the distal side of the hollow portion. A fragile portion that can be broken is formed. The gasket can be ruptured and separated from the fragile portion so that the gasket remains inside the syringe body after use, and the gasket can be separated from the proximal end opening of the separated proximal end portion. The needle tube of the needle tube assembly attached to the syringe body can be housed, and the hub of the needle tube assembly is fitted into the inner periphery of the opening so that it can also function as a protector. To provide And there.

Still another object of the present invention is to provide a syringe body and a pusher with a gazette attached to the tip, and a pusher attached to the tip of the pusher inward from the base end opening of the syringe body. The presser has a fragile portion that can be broken in the middle of the distal end side of the pusher when the gasket is pressed into contact with the entire circumference. The opening has a hollow portion of a required length capable of accommodating the needle tube of the needle tube assembly attached to the syringe body through the opening, and the inner surface of the broken end is formed in the hub of the needle tube assembly. An object of the present invention is to provide a syringe characterized in that it is configured so as to be fitted and also function as a protector.

Still another object of the present invention is to provide a syringe body and a pusher having a gasket attached to the tip, and the pusher is attached to the tip of the pusher inside from the base end opening of the syringe body. In a syringe in which the gasket is pushed so as to be in close contact with the entire circumference, the pusher has a connecting portion that can be separated into two parts from the middle on the tip side, and the pusher is separated from the connecting portion. At least one of the base end and the separation end is open, and has a hollow shape capable of accommodating the needle tube of the needle tube assembly attached to the syringe body from the open end, and the opening is formed of the needle tube assembly. Another object of the present invention is to provide a syringe characterized in that it is configured to be fitted to a syringe body or to serve as a protector.

Another object of the present invention is to provide a syringe body and a pusher having a gasket attached to the distal end thereof, and a gasket attached to the distal end of the pusher to the inside from the base end opening of the syringe body. Push in so that it fits all around In the syringe described above, the pusher is formed of a connecting structure that can be separated from a gasket such as a screwing, fitting, a rotatable mechanism or a chucking mechanism, and has a proximal end or a small distal end. One end is open and has a hollow shape capable of accommodating the needle tube of the needle tube assembly attached to the syringe body from the opening, and the opening and the portion are fitted to the hub or the syringe body of the needle tube assembly. To provide a syringe characterized in that it is configured to be able to double as a protector.

Still another object of the present invention is to provide a syringe body and a pusher having a gasket attached to the distal end, and a gasket attached to the distal end of the pusher inside the proximal end opening of the syringe body. The pusher has a hollow shape in which the distal end is opened and the needle tube of the needle tube assembly can be housed through the opening, and the opening is formed in the syringe. The gasket is formed so that it can be fitted to the hub of the needle tube assembly attached to the syringe body, and the tip is covered with the gasket. Thus, a syringe characterized in that it is configured to cover the needle tube and also function as a protector is provided.

Still another object of the present invention is to provide a syringe characterized in that at least one needle tube guiding portion for guiding the needle tube of the needle tube assembly is formed at the base end where the pusher is opened. It is in. 'Yet another object of the present invention is to provide a syringe characterized in that the cut portion of the needle tube guiding portion is formed so as to be cut into a V-shape or a U-shape. is there. Still another object of the present invention is that the needle tube guiding portion is formed at the outer edge of the end face of the proximal end opening of the pusher as a concave portion whose width gradually increases toward the end face with the tip end in the accommodation direction of the needle tube as a vertex. It is to provide a syringe that specializes in this. .

Another object of the present invention is to form the needle tube guiding portion on the outer surface of the proximal end opening of the pusher as a turn which is inclined toward the axis as approaching the end surface and is opened to the end surface. It is to provide a syringe that specializes in this.

Still another object of the present invention is to provide a needle tube guide, in which a part of the inner peripheral surface of the inlet has a predetermined length when the base end opening of the pusher is viewed from the outside perpendicular to the center line of the pusher. An object of the present invention is to provide a syringe characterized by being formed as an exposed shape.

Yet another object of the present invention is to provide a syringe characterized in that the needle tube guide is formed on the base end surface of the pusher as a projection capable of guiding the needle tube of the needle tube assembly.

Still another object of the present invention is that the needle tube guiding portion is formed as a tongue piece that gradually moves away from the axis as the needle tube guiding portion moves away from the base end surface of the pusher in the axial direction outward. If Mel ₀ and that provides a Syringe to

Another object of the present invention is to provide a needle tube guide in which the base end face of the pusher is colored in a color different from that of the part other than the end face by a two-color molding method, or the pusher is colored and transparent. An object of the present invention is to provide a syringe characterized by being formed from a metal.

Still another object of the present invention is to provide a syringe characterized in that a flange portion is formed on the base opening side of the presser. O

Still another object of the present invention is to provide a needle tube assembly having an advantageous distal end and a hub supporting a proximal end of the needle tube, wherein the hub is fitted to a distal end opening of the syringe body. An object of the present invention is to provide an injection device having a three-dimensional structure. BRIEF DESCRIPTION OF THE FIGURES

The drawings relate to the syringe and the injection device of the present invention, and

FIGS. 1a to 1e relate to the first embodiment, and FIGS. 1a to 1c are partial cross-sectional front views when the fragile portion of the pusher is broken during supply of the product, during use, and after use, respectively. d is an illustration of the needle tube when it is stored in the protector, and Fig. 1 e is a partial cross-sectional front view at the time of disposal.

FIGS. 2a and 2b show a front view in partial cross section when used and when discarded, respectively, according to the second embodiment.

Figs. 3a and 3b show a front view of a partly sectional view at the time of use and at the time of disposal, respectively, according to the third embodiment.

FIGS. 4 a and b relate to the fourth embodiment, and are respectively a partial sectional front view at the time of use and at the time of disposal.

Figs. 5a and 5b are partial cross-sectional front views at the time of use and at the time of disposal, respectively, according to the fifth embodiment.- Figs. 6a and 6b are at the time of use and disposal of the sixth embodiment, respectively. Front view,

FIGS. 7 a and b relate to the seventh embodiment, and are respectively a partial sectional front view at the time of use and at the time of disposal. FIGS. 8 a and b relate to the eighth embodiment, and are respectively a partial cross-sectional front view at the time of use and at the time of disposal.

FIGS. 9a and 9b are partial front views of the ninth embodiment when used and discarded, respectively.

FIGS. 10 a and b relate to the tenth embodiment.

Figs. 11a and 11b are front views, partially in section, at the time of use and at the time of disposal, respectively, according to the eleventh embodiment.

FIGS. 12a and 12b are partial cross-sectional front views of the twelfth embodiment during use and disposal, respectively.

FIGS. 13 a to 13 are explanatory diagrams of modified examples of the needle tube guide provided at the base end of the presser. BEST MODE FOR CARRYING OUT THE INVENTION

Next, preferred embodiments of the syringe and the injection device according to the present invention will be described and will be described in detail below with reference to the accompanying drawings.o

First, the syringe and injection device of the first embodiment shown in FIGS. 1a to 1e will be described.

This embodiment is of a type in which the pusher 2 is broken while the gasket 3 remains in the syringe body 1 after use, and is applied to blood collection and injection of a drug solution. This will be described in detail. The presser 2 is made of rigid plastic, has a hollow portion 2 c having a predetermined length opened from the base end and closed at the depth end, and the hollow portion 2 c A fragile portion 6 that can be broken is formed in the middle of the tip side. Therefore The gasket 3 can be broken and separated from the fragile portion 6 so as to leave the gasket 3 inside the syringe body 1 after use, and the needle tube 4 of the needle tube assembly B can be stored from the base end opening of the separated base end side portion. The hub 5 of the needle tube assembly B is fitted into the inner periphery 2 e of the opening so that it can also serve as a protector.

In the pusher 2 of this embodiment, the hollow portion 2c is opened from the base end, and the length HX of the hollow portion is selected to be larger than the length ^ ₂ of the needle tube assembly B. The needle tube 4 of the needle tube assembly B is configured so that the needle tube 4 of the needle tube assembly B can be housed, and the inner periphery 2 e of the opening is gradually increased toward the end face. It is easy to do. Then, three to six ribs 2 P are formed on the inner periphery 2 e of the opening so that the hub 5 of the needle tube assembly B is fitted and supported.

In the pusher 2 of this embodiment, the hollow portion 2c is opened from the base end, so that when the syringe is provided separately from the syringe needle, particularly when provided as an injection device. In some cases, as shown in Fig. 1a, if the needle tube assembly B is stored in the hollow portion 2c of the pusher 2 as shown in Fig. There is no need to separately cover the protector, making the casing compact and compact.

When providing as an injection device, the needle tube assembly B is provided in the hollow portion 2c of the pusher 2 as shown in Fig. 1a, and it is used in Fig. 1b. The needle tube assembly B may be taken out and fitted into the distal end opening 1a of the syringe 1 as shown in FIG. Therefore, the syringe and needle tube assembly are housed in one casing without complete assembly. The operation of assembling the syringe and the needle tube assembly can be performed simply and quickly, compared to the case where it is provided as one. That is, when the injection device is provided housed in one casing without assembling the syringe and the needle tube assembly, the needle tube assembly is first removed, the protector is removed, and the protector is mounted. Since the needle tube assembly is fitted into the opening of the syringe by holding the syringe after placing it, it is troublesome, and the protector may be dropped from a table or the like, or may be misplaced or lost. In this embodiment, such a situation can be reliably avoided.

The fragile portion 6 of the pusher 2 of this embodiment is formed in an extremely short linear shape having a length of, for example, 1 to 2 boxes, and stress concentration due to a bending force occurs, so that it can be easily broken. The cross-sectional area is selected to have sufficient resistance to stress in the axial direction and not to break or buckle when pushed or pulled. After use, hold the base flange 2a to expose the fragile part 6 from the base opening of the syringe body 1. The rib 2P fits into the hub 5 if it is moved deeply with the proximal end opening positioned over the needle tip of the needle tube 4 of the needle tube assembly B. Therefore, the pusher 2 can also be used as a protector (hereinafter, the pusher 2 is sometimes referred to as a protector 12 depending on the case). In this case, as shown in FIG. 1b, the pusher 2 has a V-shaped needle tube guiding portion 2q that guides the needle tube 4 of the needle tube assembly B at the opened base end. . Therefore, as shown in FIG. 1 d, the syringe body 1 having the used needle tube assembly B is held substantially horizontally with one hand, and the needle tube guiding portion 2 q is used with the other hand. The lower part of the protector 2 may be held so as to be inclined upward so that the side surface of the distal end portion of the needle tube 4 of the needle tube assembly B may be put on the needle tube guiding portion 2q. That is, since the needle tube guiding portion 2 q is urged into a V-shape, this exerts a guiding action on the needle tube 4 and guides the needle tube 4 to the center of the needle tube guiding portion 2 q. Then, if the needle tube 4 is slid back until the needle tip comes out of the inside of the protector 12, the needle tip slightly escapes downward and can be introduced into the inlet of the protector 2. After all, as shown in Fig. 1e, it is sufficient to move the needle tip in the housing direction with the protector 1 being horizontal, and to fit the inner circumference of the inlet end of the protector 2 to the hub 5 of the needle tube assembly B. There is no discrepancy in the needle tip with respect to the inner circumference of the inlet side end of 2, and even if the discrepancy occurs, there is the proximal flange portion 2a, so that it is possible to protect the finger from the needle tip of the needle tube 4. I can do it. Of course, the needle tube guiding portion 2q may be formed in a U shape or the like in addition to the V shape. Needless to say, the number of the needle tube guiding portions 2q is not limited to one but may be plural.

Note that the syringe body 1 is made of glass or plastic, the gasket 3 is made of rubber or soft plastic, the needle tube 4 is a stainless steel tube or steel tube, and Hub 5 is a plastic product. However, these materials are not limited to those described above.

Next, the syringe and injection device of the second embodiment shown in FIGS. 2a and 2b and the third embodiment shown in FIGS. 3a and 3b will be described. These two embodiments are similar to the first embodiment in that the pusher 2 is broken while the gasket 3 remains in the syringe body 1 after use. belongs to.

Therefore, the pusher 2 is made of a rigid plastic and is formed in a circular tube shape with both ends opened, and the fitting with the flange 2a at the base end and the gasket 3 at the tip is firmly performed. Each of the locking portions 2 fa has a fragile portion 6 which can be broken at the front end. The inner diameter of the broken end portion of the proximal end portion of the needle 2 that is broken and separated from the fragile portion 6 after use is selected as a diameter that can be fitted to the hub 5, and the pusher proximal end. The length £, to the more fragile portion 6, is selected to be sufficiently larger than the length ^ ₂ of the needle tube assembly B. In addition, it has a hollow portion 2c of a required length capable of accommodating the needle tube 4 through the opening, and the inner surface of the broken end is fitted to the hub 5 so as to serve as a protector. In this respect, the embodiment of FIGS. 2A and 2B and the embodiment of FIGS. 3A and 3B are common to the first embodiment. Therefore, in any of the embodiments, the pusher 2 can be easily broken and separated by moving the gasket 3 to a position near the base end opening of the syringe body 1 after use, and bending it.

The pusher 2 shown in FIGS. 2a and 2b has a uniform hollow portion 2c having a required inside diameter that can be fitted to the hub 5, and has a needle tube guiding portion 2 cut at the base end into a V shape. After use, break and separate after use to hold the broken end, place the needle tip on the needle tube guide 2 q, pull it outward, position it in the proximal end opening of the pusher, and then When the hub 5 is moved inside the pusher 2 and the hub 5 is fitted into the base end opening, the needle tip is located sufficiently retracted from the pusher base end, and the pusher 2 also serves as a protector. I can do it.

In particular, the length from the proximal end of the pusher to the fragile portion 6 is £, Since the length is sufficiently larger than the length ^ ₂ , even if the needle tip is accidentally removed from the opening of the protector, the needle tip hits the flange 2a and the finger touches the flange 2a. Since the distance of the needle tip is kept large, sticking of the finger with the needle tip is avoided.

'' The pusher 2 in Figs. 3a and b is the same as the pusher 2 in Figs. 2a and b, and the middle part 7 on the distal end side of the small diameter hollow portion having the same inner diameter is slightly smaller than the inner diameter of the syringe body 1. Diameter. However, a bulging portion is formed in the small-diameter hollow portion so as to have a relatively large diameter, and a fragile portion 6 is formed in the middle of the large-diameter halfway portion 7 in the axial direction. For this reason, when the pusher 2 in FIGS. 3a and 3b is broken from the fragile portion 6 after use, the broken end becomes an opening which is widened like "jugo", and the needle tip is inserted into the opening. Is easy to align.

In the weakened portion 6, a V-groove or a U-groove is formed in the outer or inner surface of the pusher 2 in the circumferential direction, or is formed in the outer or inner surface of the pusher 2 in the circumferential direction. A long slot-shaped concave portion is provided, and a plurality of slits are formed in the presser 2 in the circumferential direction, or a separate plastic member having low strength is integrally formed. It may be formed as appropriate, such as another member having low strength is fitted and adhered. The important thing is that stress concentration due to bending occurs so that it can be easily broken. Then, since the fragile portion 6 has a needle guide portion 6a which is urged into a V shape, after use, it is broken and separated to hold the base end, and the needle tip is placed on the needle guide portion 6a. It is pulled so as to come off and positioned in the proximal opening of the pusher, moved inward of the pusher 2, and the hub 5 is fitted into the proximal opening.

4a and 4b show a fourth embodiment of the syringe and injection device of the present invention. It is an example.

In this embodiment, the pusher 2 is separated from the connected state at the distal end in a state where the gasket 3 is left in the syringe body 1 after use, and is used for blood detection and injection of a chemical solution. Is done. The presser 2 comprises a base presser body 21 having a flange 2a,

-A connection structure comprising a connection piece 22 screwed to a male screw 2d formed at the tip of the presser main body 21 and fitted to the gasket 3. The pusher body 21 has a length sufficiently larger than the length ^ ₂ of the needle tube assembly B, and the length ϋX of the hollow portion 2c opened from the base end is the length of the needle tube assembly B. The length is larger than £ ₂ , and the base opening 2 e is formed so that it can be fitted to the hub 5 c.The base of the presser 2 is cut into a V shape. A needle tube guide 2q is provided.

Therefore, after use, the pusher main body 21 is screwed in the direction in which it is loosened from the connecting piece 22 and removed, and the needle tip is placed on the needle tube guiding portion 2q and then pulled outward so as to direct the pusher 2 into place. The needle tip is positioned in the proximal opening, and then moved inward of the pusher 2 and the proximal opening 2 e is fitted to the hub 5, and the needle tube 4 is stored in the hollow portion 2 c . That is, the presser body 21 also functions as a protector. On the other hand, if the pusher 2 is to be put on the needle tube 4 in a state where the needle tip is out of the opening, the needle tip comes into contact with the flange 2a. The detached state can be easily determined, and the flange 2a protects the finger holding the presser 2 from the needle tip.

FIGS. 5a, b, 6a, b, 7a, b, 8a, b show the fifth embodiment of the syringe and the injection device of the present invention, respectively. 8 shows an embodiment. Each of these embodiments is a type in which the pusher 2 is separated from the gasket 3 after use, and is applied to blood collection and injection of a drug solution. .

First, the pusher 2 shown in FIGS. 5a and 5b has a threaded portion 2d at the tip and only the point directly screwed to the gasket 3

4 is different from the embodiment.

The pusher 2 shown in FIGS. 6a and 6b is a required circular tube having a uniform inner diameter that can be fitted to the hub 5 and has one or more protrusions 2b on the outer surface of the tip. , So that the pusher 2 does not easily come off when the pusher 2 is moved during use. After use, the pressing with a finger so as not to escape from the gasket .3 starve Li Nji main assembly 1, applying a force in the direction of arrow X, and X _2. That is, a slight force is applied so that the presser 2 is inclined with respect to the syringe shaft and is separated from the gasket 3. Then it comes off very easily.

At the base end of the pusher 2, a needle tube guiding portion 2 の of a V-cut is provided. Therefore, after use, the pusher 2 is detached from the gasket 3, the needle tip is placed on the needle tube guiding section 2q, and then pulled so as to come off and positioned within the base end opening of the pusher 2. The pusher 2 can be moved to the inside of the pusher 2 and put on the needle tube 4 from the base end (or the distal end). C The pusher 2 in FIGS. It has a flange-shaped flange 2a which also serves as a lock, and has a lock-shaped connection port at the end consisting of a small-diameter shaft 2f and a projection 2g on its side surface. The part is inserted into the required lock-shaped hole 3a formed in the gasket 3 and twisted to lock the connection. The pusher 2a has a length of the hollow portion 2c opened from the base end and the length of the needle tube assembly B. And the inside diameter of the hollow portion 2 c is set to a diameter that can be fitted to the hub 5. At the base end of the pusher 2, a V-cut needle tube guiding portion 2 q is provided.

Therefore, after use, the pusher 2 can be detached from the gasket 3 by pulling it while rotating it as required, and the flare-shaped flange 2a leads to the V-shaped needle tube guide. Place the needle tip on the part 2 q and pull it off so that it is positioned in the base end opening of the pusher 2 and moves inward of the pusher 2, and easily and safely from the base end to the needle 4. Can be covered. That is, the pusher 2 also functions as a protector.

The pusher 2 shown in FIGS. 8a and 8b includes an inner cylinder 23, an outer cylinder 24, and a spring 25. The inner cylinder 23 has a flange 2a at the base end, and a chuck 秆 2h, which is vertically divided into a plurality of lengths from the front end to a required halfway, is crushed at the base end and directed toward the front end. A triangular chuck claw 2 i is formed on the inner surface of the tip of each chuck sweat 2 h, and a base opening 2 e is formed to have a diameter that can be fitted to the hub 4. The length of the hollow portion 2c opened from the base end is selected to be larger than the length of the needle tube assembly B. The outer cylinder 24 is slidably loosely fitted to the inner cylinder 23 and urged in the distal direction by a spring 25 so that the distal end 緣 24 a chucks the sweat 2 h of the inner cylinder 23. It is configured to be tightened from the outside so that

On the other hand, the gasket 3 has a required hollow shape opened from the base end face, and a to-be-chucked part 3c whose base is constricted and whose end is pointed in a wedge shape is protruded at the center of the inner surface of the end wall 3b. The opening diameter of the base end surface is set to a size to which the distal end of the outer cylinder 24 fits. Follow Then, the outer cylinder 24 is moved in the proximal direction so as to compress the spring 25 to open the chuck rod 2 h at the distal end of the inner cylinder 23, and is fitted into the opening on the proximal end face of the gasket 3. When the sweat 2 h is located outside the to-be-checked portion 3 c and the finger is released from the outer cylinder 24, the outer cylinder 24 moves toward the distal end by the bias of the spring 25, and Since the h is tightened, the chucked portion 3c can be chucked without the chuck claws 2i coming off. Thereby, the pusher 2 can be connected to the gasket 3. On the other hand, to release the pusher 2 from the connection with the gasket 3, the outer cylinder 24 is moved in the proximal direction so as to compress the spring 25, and the chuck rod at the distal end of the inner cylinder 23 is moved. After opening 2 h, the inner cylinder 23 may be pulled.

At the base end of the pusher 2, a needle tube guiding portion 2q for V-cut is provided. Therefore, after use, the pusher 2 can be detached from the gasket 3, and the needle is placed on the needle tube guiding section 2q with the flange 2a first, and then pulled so as to come off and into the opening. It is only necessary to position and move the pusher 2 inward. In this case, even when the needle tube accommodating operation is inconsistent, the flange 2a protects a finger or the like from the needle tip. 9a, b, 10a, b, 11a, b, 12a, b show the ninth to twelfth embodiments of the syringe and the injection device of the present invention, respectively. .

In each of these embodiments, the pusher 2 is removed together with the gasket 3 after use, and is suitably used for injecting a chemical solution. Hereinafter, description will be made in order.

The pusher 2 shown in FIGS. 9a and 9b has a hollow portion 2c having a uniform inner diameter that can be fitted to the hub 5 and that can accommodate the needle tube assembly B. It has a tube-shaped flange with a flare-shaped flange 2a at the base end, one or more protrusions 2b on the outer surface at the tip end, and is permanently attached to the gasket 3. are doing. The proximal end of the pusher 2 is provided with a needle tube guiding portion 2 q for a V-force.

Therefore, after use, the pusher 2 is removed from the syringe body 1 together with the gasket 3 instead of detaching the pusher 2 from the gasket 3 and the needle guide function of the needle tube guide section 2q is used. Put the pusher 2 on the needle tube 4 and fit it with the hub 5 to double as the protector.

The pusher 2 shown in FIGS. 10a and 10b is a cylindrical member having a required length and a hollow portion 2c having a base end extending in a trumpet shape and accommodating the needle tube assembly B. e is large enough to fit into the syringe body 1, and the tapered cylindrical portion 2 j connected to the base opening 2 e does not interfere with the hub 5.

Therefore, after use, the pusher 2 is removed together with the gasket 3 from the inside of the syringe body 1, and the needle opening 4 e is used by using the needle guiding function of the needle guiding part 2 q with the base end opening 2 e first. If the base opening 2 e is fitted to the syringe body 1, the protector also functions.

In this embodiment, since the base end opening 2 e is formed to have a large diameter, it is easy to position the needle tip inside, and since the pusher 2 is sufficiently longer than the needle tube 4, When the needle tube is stored later, the distance between the needle tip and the finger is large, and the needle tube can be stored very safely.

The pusher 2 of FIGS. 11a and 11b has a hollow portion 2c capable of accommodating the needle tube assembly B, has a large diameter at the base end, and has a ring-shaped magnet 8 fitted therein. . The magnet 8 is a ferrite magnet or plastic. The magnet 8 is made of a suitable magnetic material such as a magnet, and has an inner surface formed so as to be fitted to the hub 5 and a base end surface formed in a mortar shape. The poles may be magnetized so that they appear on any surface. In other words, a ring-shaped magnet usually has N and S poles appearing at the end face, but it is also possible to magnetize so that N and S poles appear at the inner and outer surfaces. That is preferred.

On the other hand, in response to the provision of the magnet 8, the material of the needle tube 4 is limited to a steel tube or a stainless steel tube having magnetic attraction. After use, the pusher 2 is removed together with the gasket 3 from the inside of the syringe body 1 and the needle tip approaches the base opening 2e, so that the needle tube 4 is attracted to the magnet 8, so that the needle tip is It does not come off from the proximal opening 2e. Since the needle tip is slightly attracted to the magnet 8, it can be guided to the hollow portion 2c of the pusher 2. Also in this case, the needle guiding function of the needle guiding section 2 q can be used. The pusher 2 shown in FIGS. 12a and 12b has a hollow portion 2c of a required length capable of accommodating the needle tube assembly B, has a flange 2a at a base end, and has an opening 2 for fitting a hub. k is formed so that it can be fitted to the hub 5, and a tip opening 2 n that is larger than the hub fitting opening 2 k is provided continuously on the tip side, and the gasket 3 is covered at the tip of the pusher 2. Is being worn. The front end wall 3b of the gasket 3 is formed to be thin.

After use, the pusher 2 is detached from the syringe body 1 together with the gasket 3 ′ after use, the tip wall 3 b of the gasket 3 is pierced with the needle tube 4, further pierced with the hub 5, and fitted into the hub. Ha wearing opening 2k Into the box 5. Then, the tip wall 3b of the broken-out gasket 3 is folded inward so as to be accommodated in the tip opening 2π. According to this embodiment, since the needle tip first penetrates the vicinity of the center of the distal end wall 3b of the gasket 3, the needle tip is unlikely to be displaced due to hand trembling or the like. Since the distance between the needle tip and the finger is sufficiently large, there is no danger of sticking the finger with the needle tip.

The injection device of the present invention does not exclude the case where the product is provided with the needle tube protected by a separate protector as in the prior art.

FIGS. 13a to 13b show various other modifications of the needle tube guiding section 2q shown in FIG. 1b. To explain in order below, in Fig. 13a, a concave portion 2q whose width gradually increases toward the end surface is formed at the outer edge of the end face of the base opening of the pusher 2 with the tip end in the accommodating direction of the needle tube as the vertex. The concave portion 2q is a needle tube guiding portion. In FIG. 13b, a concave portion 2q is formed on the outer surface of the proximal end opening of the pusher 2 as it approaches the ¾ surface and is inclined toward the axis and opened to the end surface. q is the needle tube guide. In FIGS. 13c and 13d, a V-groove-shaped concave portion 2 する whose width and depth gradually increases toward the end surface when viewed from the outer surface side is formed on the outer surface of the proximal end opening of the presser 2. The IM1 section 2q is a needle tube guiding section. In FIG. 13c, the concave portion 2q does not reach the inner surface of the needle tube accommodating portion. In Fig. 13d, the four parts 2q reach the inner surface of the needle tube housing part. FIG. 13e shows the same number of recesses 2q as in FIG. 13d arranged over the entire circumference. The needle tube guiding section 2q shown in FIGS. 13a to 13e is the same as the needle tube guiding section 2q shown in FIG. 1b. Has ability. 13 f and g, when the base opening of the presser 2 is viewed from the outside perpendicular to the center line of the presser, a part of the inner peripheral surface of the inlet is exposed to a required length. The inner peripheral surface of the exposed portion is formed as a needle guide portion at the inlet portion, and has a needle guide function of placing a needle tip on the exposed portion and guiding the needle inward. In the case of Fig. 13f, the opening end face of the base end of the presser 2 is formed in an elliptical shape inclined with respect to the center line of the presser 2, and in the case of Fig. 13g, the presser 2 is The needle tube mounting portion, which is formed by cutting off one side of the base end portion and projecting into a semi-cylindrical shape, is a needle tube guiding portion. In FIG. 13h, a projection 2q that can guide the needle tube of the needle tube assembly is provided on the end face of the proximal end portion of the pusher 2, and the projection 2q is a needle tube guide. That is, the needle tube is brought into contact with the projection 2q to suppress hand tremors, and the needle tube is slid in the direction of the hub by regulating the position. Guide inward. At least one projection 2q is sufficient. Fig. 13i shows that a large number of V-grooves 2q, which are wide open at the end face and become shallow inward, are provided on the inner surface of the base end of the pusher 2 so as to cover the entire circumference. It has the function of placing the needle point and guiding it inward. At least one V groove 2q is sufficient. In FIG. 13j, a tongue piece gradually moving away from the axis is formed from the end face of the pusher 2 toward the outside in the axial direction from the base end face, and the tongue piece is guided to the guiding part. It has the function of guiding the needle tube placed here inward. In Fig. 13k, the base end face of the presser 2 'indicated by hatching is colored by a two-color molding method in a color different from that of the part other than the end face, or the presser 2 is colored and transparent. So that it looks darker than parts other than the end face. This is a configured needle tube guiding section, which has a function of guiding the needle tube by clarifying the contour of the opening at the base end. In FIG. 13 ^, a slit 2 r extending in the axial direction is formed from the base end face of the presser 2. This slit 2r is a slit whose width is formed sufficiently larger than the outer diameter of the needle tube, and which faces the inclined surface 2 so that the width gradually becomes narrower toward the center at the base end. s and 2 s. Therefore, when the needle tube moves toward the inner center so that the midway near the tip of the needle tube is located between the inclined surfaces 2 s, 2 s, the inclined surface that is shifted to the left or right from the slit 2 r 2 s guides the needle tube to slit 2 r, and the needle tube passes through slit 2 r as it is and can be pushed inward. Industrial applicability

As described above, in the syringe and the injection device of the present invention, the pusher has a hollow portion of a required length capable of accommodating the needle tube, and is separated from the syringe body after use and attached to the syringe body. The needle tube of the assembled needle tube assembly is covered with a hub or a syringe so as to function as a protector.

For this reason, after use, the pusher can be used as a protector for the needle tube, and one end of the pusher may be gripped so as to cover the needle tube from the opening at the other end. Is kept large enough so that the pusher can be safely covered over the needle tube. According to the present invention, since the pusher is used as a protector after use, a conventional protector of a separate member is used. It is possible to avoid misplacement, misleading, or falling off the table.

Claims

The scope of the claims

(1) Equipped with a syringe body and a pusher with a gasket attached to the tip, and tightly adhere the gasket attached to the tip of the pusher to the inside from the base end opening of the syringe body. In a syringe pressed in such a manner, the pusher is formed to have a hollow portion of a required length, and after use, the entire portion or a portion excluding the gasket can be separated from the syringe body. The needle tube of the needle tube assembly attached to the syringe body can be stored in the hollow portion of the pusher from one end opening of the pusher, and the hub of the needle tube assembly is provided on the inner periphery of the needle tube inlet portion of the hollow portion. Or, a syringe characterized in that the syringe body is fitted so that it can also serve as a protector. '

(2) Equipped with a syringe body and a pusher with a gasket attached to the tip.'The gasket attached to the tip of the pusher was inserted into the syringe body through the base end opening. In a syringe which is pushed in so as to be in close contact with the entire circumference, the pusher has a hollow portion of a required length opened from the base end, and can be broken on the distal side of the hollow portion. A fragile portion is formed, and the gasket can be broken and separated from the fragile portion so that the gasket remains inside the syringe body after use, and the syringe is opened from the proximal opening of the separated proximal portion. A syringe capable of accommodating the needle tube of the needle tube assembly attached to the main body, and configured so as to be able to double as a protector by fitting a hub of the needle tube assembly into the inner periphery of the opening. .

(3) Equipped with a syringe body and a pusher with a gasket attached to the tip, and a gasket attached to the tip of the pusher inside the base opening of the syringe body, all around the circumference. Into the syringe In the pusher, a fragile portion that can be broken is formed in the middle of the distal end side. When the pusher is broken and separated from the fragile portion after use, the pusher opens from the broken end, and is taken into the syringe body from the opening. The attached needle tube assembly has a hollow portion of a required length capable of storing a three-dimensional needle tube, and the inner surface of the broken end is fitted to the hub of the needle tube assembly so that it can also serve as a pegter. A syringe characterized by being composed.

(4) Equipped with a syringe body and a pusher with a gasket attached to the tip, so that the gasket attached to the tip of the pusher goes into the inside of the syringe body through the base end opening and adheres all around. In a syringe pressed into a cylinder, the pusher has a connecting portion that can be separated into two parts from the middle on the distal end side, and the pusher separated from the connecting portion has a proximal end or the separation portion. At least one of the ends is open, and has a hollow shape capable of accommodating the needle tube of the needle tube assembly attached to the syringe body from the open end, and the opening is a hub or syringe of the needle tube assembly. A syringe characterized in that it is configured so that it can be fitted to the main body and also serve as a protector.

(5) Equipped with a syringe body and a pusher with a gasket attached to the tip, and the gasket attached to the tip of the pusher is brought into close contact with the inside of the syringe body through the base opening. In a syringe pressed in such a manner, the pusher is formed of a connection structure that can be separated from a gasket such as a screwing, fitting, locking mechanism or a chucking mechanism. At least one of the ends has an opening, and has a hollow shape capable of accommodating the needle tube of the needle tube assembly attached to the syringe body through the opening, and the opening is formed in a hub or a cylinder of the needle tube assembly. It is designed so that it can be fitted to the And syringes.

(6) Equipped with a syringe body and a pusher with a gasket attached to the tip, so that the gasket attached to the tip of the pusher goes into the inside of the syringe body through the base end opening so as to be in close contact with the entire circumference. The pusher has a hollow shape which has an opening at the tip and can receive the needle tube of the needle tube assembly through the opening, and the opening is attached to the syringe body. The gasket is attached to the tip of the needle tube assembly, and is detached from the syringe body after use to penetrate the gasket with the needle tube after use. A syringe configured to cover the needle tube so as to be able to cover the protector. _s

(7) In the syringe described in any one of claims 1, 2, 4, and 5, the pusher guides the needle tube of the needle tube assembly to the opened base end. A syringe characterized by being formed.

(8) The syringe according to claim 7, wherein the needle tube guiding portion is formed such that a cut is cut into a V-shape or a U-shape.

(9) In the syringe according to claim 7, the needle tube guiding portion is formed at the outer edge of the end face of the base end opening of the pusher, the width of which gradually increases toward the end face with the tip end in the accommodation direction of the needle tube as a vertex. A syringe characterized by being formed as such.

ο) In the syringe according to claim 7, the needle tube guiding portion is provided on the outer surface of the proximal end opening of the pusher with a concave portion which is inclined toward the axis as approaching the end surface and is opened to the end surface. It is specially formed Syringe to mark.

シ In the syringe according to claim 7, the needle tube guiding portion is configured such that a part of the inner peripheral surface of the inlet portion is formed when the proximal end opening of the pusher is viewed from the outside in the vertical direction with respect to the center line of the pusher. A syringe characterized by being formed as a shape that is exposed for a predetermined length.

The syringe according to claim 7, wherein the needle tube guide is formed as a projection on the end face of the pusher to guide the needle tube of the needle tube assembly.

3) The syringe according to claim 7, wherein the needle tube guiding portion is formed as a tongue piece that gradually moves away from the axis as it moves further outward in the axial direction from the end face of the base end of the pusher. Characteristic syringe.

4) In the syringe according to claim 7, in the needle tube guiding portion, the base end surface of the pusher is colored in a different color from a portion other than the end surface by a two-color molding method, or the pusher is colored and transparent. A syringe characterized by the fact that it is formed of 15 plastics.

α $ The syringe according to any one of claims 1 to 14, wherein a flange portion is formed on a base opening side of the pusher.

α6) The syringe according to any one of claims 1 to 15, and a sharp

20. An injection device comprising: a needle tube having a distal end; and a hub supporting a proximal end of the needle tube, wherein the hub is fitted to a distal end opening of the syringe body.