JP2718534B2 - Injection device with injection needle separation mechanism - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an injection device with an injection needle separation mechanism that can easily separate a used injection device into a syringe and a medical needle.

[Related Art] In recent years, when a used injection device is discarded, a finger or the like is accidentally stabbed with a needle point, and a blood infection accident such as AIDS or hepatitis occurs, which is a problem. In order to prevent such accidents, there is a problem how to safely dispose of used medical devices such as used injection devices and medical needles.

However, the syringe is made of plastic or glass, and the medical needle is made of stainless steel. Medical needles are more dangerous when combined with a syringe by mass action than when used alone.

[Problems to be Solved by the Invention] Therefore, it is preferable that the medical needle is separated from the syringe and discarded. However, conventionally, a used injection device can be easily separated into the syringe and the medical needle. No injection device with a needle separation mechanism has been provided.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an injection device with an injection needle separation mechanism that can easily separate a used injection device into a syringe and a medical needle.

[Means for Solving the Problems] An injection device with an injection needle separation mechanism according to the first invention of the present application comprises:
As shown in FIGS. 1 (a) and 1 (b), the syringe body 11 has a pusher 12 with a gasket attached to the distal end thereof.
A syringe 1 which is pressed in such a manner that a gasket attached to the distal end of the needle 12 is brought into close contact with the entire circumference; and a needle tube 21 and a base end of the needle tube 21 which are supported and have a tapered hole 22a. And a medical needle 2 comprising a hub 22 fitted to the male tapered surface of the outer surface of the distal end opening 11a of the medical device 1. After use, the injection device contacts the proximal end surface of the hub 22 of the medical needle 2. A ring piece 3 that moves so as to be in contact with and separates the medical needle 2 from the syringe main body 11 is provided between the large-diameter portion distal end surface 11b of the syringe main body 11 and the hub 22 of the medical needle 2, and The syringe main body 11 is fitted with a tip opening 11a of the syringe main body 11, and the syringe main body 11 has one or more mountain-shaped hub pressing projections 11c protruding from the large-diameter portion distal end face 11b and surrounding the distal end opening 11a. The ring piece 3 has a base end face. The syringe body 11
When the ring piece 3 is rotated relative to the syringe body 11 after use, the wedge action occurs between the projections when the ring piece 3 is rotated relative to the syringe body 11 after use. Moving toward the distal end of the needle tube of the medical needle 2,
The medical needle 2 is detached from the syringe main body 11 by pressing the base end surface of the hub 22 of the medical needle 2 with the ring peak distal end surface 3b.

The injection device with an injection needle separation mechanism according to the second invention of the present application,
As shown in FIG. 2, a syringe body 11 and a pusher 12 with a gasket attached to the distal end thereof are provided.
A syringe 1 which is pressed in such a manner that a gasket attached to the distal end of the needle 12 is brought into close contact with the entire circumference; and a needle tube 21 and a base end of the needle tube 21 which are supported and have a tapered hole 22a. An injection device comprising a medical needle 2 comprising a hub 22 fitted to a male tapered surface of an outer surface of a distal opening 11a of the syringe body 11. An external thread 11d is formed and the external thread 11d is formed.
When rotated in a predetermined direction after use, the medical needle 2
A nut 4 for moving the medical needle 2 away from the syringe body 11 by moving toward the distal end of the needle tube so as to contact the base end face of the hub 22 is screwed.

The injection device with an injection needle separation mechanism according to the third invention of the present application,
As shown in FIG. 3, the syringe body 11 has a pusher 12 with a gasket attached to the distal end, and a pusher is inserted into the syringe body 11 from the base opening.
A syringe 1 which is pressed in such a manner that a gasket attached to the distal end of the needle 12 is brought into close contact with the entire circumference; and a needle tube 21 and a base end of the needle tube 21 which are supported and have a tapered hole 22a. And a medical needle 2 comprising a hub 22 fitted to the male tapered surface of the outer surface of the distal end opening 11a of the medical device 1. After use, the injection device contacts the proximal end surface of the hub 22 of the medical needle 2. A detaching member 5 that moves so as to be in contact with and detaches the medical needle 2 from the syringe main body 11 is provided between the large-diameter portion distal end surface 11b of the syringe main body 11 and the hub 22 of the medical needle 2, and The detachable member 5 has finger contact pressure portions 5a, 5a on both sides in a direction perpendicular to the axis of the injection device, and the finger contact pressure member 5a is fitted in the distal end opening 11a of the syringe body 11. When the pressure parts 5a, 5a are pinched, the distance between the end faces of the base end face and the tip end face increases. Axial expansion deformation portion 5b which resiliently deformed so that
When the axial expansion / deformation portion 5b is flexed and deformed after use, the axial expansion / deformation portion 5b becomes a large-diameter portion distal end surface 11b of the syringe body 11 and a base end surface of the hub 22 of the medical needle 2. And the medical needle 2 is detached from the syringe main body 11.

The injection device with a needle separation mechanism according to the fourth invention of the present application,
As shown in FIG. 4, the syringe body 11 includes a syringe body 11 having a distal end opening 11a at an eccentric position of the large diameter portion distal end face 11b and a pusher 12 having a gasket attached to the distal end. A syringe 1 formed by pressing a gasket attached to the tip of the pusher 12 from the end opening to the inside so as to be in close contact with the entire circumference; and a needle tube 21 and a base end of the needle tube 21 which are supported and have a tapered hole 22a. A medical needle 2 comprising a hub 22 fitted in a male tapered surface of the outer surface of the distal end opening 11a of the syringe body 11 with a tapered hole 22a; The ring piece 6 that moves so as to come into contact with the base end face of the hub 22 and separates the medical needle 2 from the syringe main body 11 includes the large-diameter portion distal end face 11b of the syringe main body 11 and the hub 22 of the medical needle 2. Between, and at the distal end opening 11a of the syringe body 11. Fitted to be in the syringe body 11, the large diameter portion distal end face 11b has a chevron-shaped hub pressing protrusions 11e, the ring piece 6, the base end face syringe body 11
When the ring piece 6 is rotated around the tip opening 11a of the syringe body 11 after use, the hub pressing projection 1e is engaged with the hub pressing projection 11e.
1e and the concave surface 6a, it moves toward the distal end of the needle tube of the medical needle 2 by a wedge action, and the ring piece distal end surface 6b
Thus, the medical needle 2 is detached from the syringe body 11 by pressing the base end surface of the hub 22 of the medical needle 2.

[Operation] The injection devices of the first to fourth inventions of the present application described above all use the ring piece 3, the nut 4, and the separating member 5 after use.
Alternatively, the syringe 1 and the medical needle 2 can be easily separated by rotating or pinching the ring piece 6.

[Embodiment] FIGS. 1 (a) and 1 (b) are embodiments according to the injection device of the first invention of the present application.

As a basic configuration, the injection device has a syringe body 11 and a pusher 12 with a gasket attached to the distal end, and a gasket attached to the distal end of the pusher 12 from the proximal end opening of the syringe body 11 to the inside. A syringe 1 which is pushed into close contact with the entire circumference, a needle tube 21 and a base end of the needle tube 21 which are supported and have a tapered hole 22a.
And a medical needle 2 comprising a hub 22 fitted to a male tapered surface on the outer surface of the front end opening 11a of the eleventh embodiment.

A unique configuration of this injection device is that a ring piece 3 for detaching the medical needle 2 from the syringe body 11 is provided. That is, as a unique configuration, the syringe body 11 has three mountain-shaped hub pressing projections 11c which are protruded from the large-diameter portion distal end surface 11b and surround the distal end opening 11a as shown in FIG. And the syringe body 11
The ring piece 3 is fitted between the large-diameter portion distal end surface 11b and the hub 22 of the medical needle 2 and in the distal end opening 11a of the syringe body 11. The ring piece 3 functions to move so as to come into contact with the base end surface of the hub 22 of the medical needle 2 after use and to detach the medical needle 2 from the syringe body 11. That is, the ring piece 3 is shown in FIG.
As shown in the figure, the base end face has a required mountain-shaped moving projection 3a to be engaged with the hub pressing projection 11c of the syringe body 11. Therefore, when the ring piece 3 is rotated relative to the syringe body 11 after use, the ring piece 3 moves toward the distal end of the needle tube of the medical needle 2 due to the wedge action generated between the projections,
By pressing the base end surface of the hub 22 of the medical needle 2 with the ring piece distal end surface 3b, the medical needle 2 can be detached from the syringe body 11.

In addition, the syringe body 11 has a ring piece detachment prevention protrusion 11f on the outer surface of the distal end opening 11a,
The ring piece 3 has a stop projection 3c on its inner periphery that fits over the outer surface of the distal end opening 11a over the ring piece detachment prevention projection 11f.
When the medical needle 2 is disengaged from the tapered fitting with the distal end opening 11a of the syringe main body 11, the medical needle 2 itself comes into contact with the ring piece detachment preventing projection 11f so as not to be detached from the distal opening 11a. .

FIG. 2 shows an embodiment of the injection device according to the second invention of the present application.

Since the basic configuration of this injection device is the same as that of the first invention, the same reference numerals are given and the description is omitted.

A unique configuration of this injection device is that a nut 4 for detaching the medical needle 2 from the syringe body 11 is provided. That is, a male screw portion 11d is formed at the base end of the outer surface of the distal end opening 11a of the syringe body 11, and
When the male thread portion 11d is rotated in a predetermined direction after use, the male needle portion 11d moves toward the distal end of the needle tube so as to come into contact with the base end surface of the hub 22 of the medical needle 2, and detaches the medical needle 2 from the syringe body 11. The nut 4 to be screwed is screwed.

The syringe body 11 has a projection 11f for preventing nut detachment on the outer surface of the distal end opening 11a.
Is a stop projection 4 which fits over the inner surface of the tip opening 11a over the ring piece detachment prevention projection 11f on the inner periphery.
This is the same as the first invention in that the nut 4 is provided so that the nut 4 does not come off.

FIG. 3 is an embodiment according to the injection device of the third invention of the present application.

Since the basic configuration of this injection device is the same as that of the first invention, the same reference numerals are given and the description is omitted. A unique configuration of this injection device is that a detaching member 5 for detaching the medical needle 2 from the syringe body 11 is provided. That is,
After use, the detaching member 5 that moves so as to abut the base end surface of the hub 22 of the medical needle 2 and detaches the medical needle 2 from the syringe main body 11 is a large-diameter portion distal end face 11b of the syringe main body 11. And the hub 22 of the medical needle 2, and is fitted in the distal end opening 11 a of the syringe body 11. The detachment member 5 has finger contact pressure portions 55a, 5a on both sides in a direction orthogonal to the axis of the injection device, and when the finger contact pressure portions 5a, 5a are pressed, the proximal end surface and the distal end surface are separated. An axial expansion / deformation portion 5b that bends and deforms so as to increase the distance between the end faces, and when the axial expansion / deformation portion 5b is deformed after use, the axial expansion / deformation portion 5b becomes larger than the size of the syringe body 11. The distance between the radial end surface 11b and the base end surface of the hub 22 of the medical needle 2 is widened so that the medical needle 2 is detached from the syringe body 11.

In addition, the outer peripheral portion of the distal end opening 11a of the syringe main body 11 has a detachment member detachment prevention protrusion 11f, and the inner periphery of the detachment member 5 passes over the detachment member detachment prevention protrusion 111f. Engaging part 5c fitted to the outer surface of 11a
This is the same as the first invention in that the detachment member 5 is not detached.

FIG. 4 shows an embodiment of the injection device according to the fourth invention of the present application.

Since the basic configuration of this injection device is the same as that of the first invention, the same reference numerals are given and the description is omitted. A unique configuration of this injection device is that a ring piece 6 for detaching the medical needle 2 from the syringe body 11 is provided. That is, after use, the ring piece 6 that moves so as to come into contact with the base end surface of the hub 22 of the medical needle 2 and separates the medical needle 2 from the syringe main body 11 is a large diameter portion distal end surface of the syringe main body 11. It is fitted between the hub 11 of the medical needle 2 and the distal end opening 11a of the syringe body 11. At the same time, the syringe main body 11 has a mountain-shaped hub pressing projection 11e on the large-diameter portion distal end surface 11b. The ring piece 6 has a concave surface 6a whose base end surface is engaged with the hub pressing projection 11e of the syringe body 11. Therefore, when the ring piece 6 is rotated around the distal end opening 11a of the syringe body 11 after use, the hub pressing projection 1
1e and the concave surface 6a, it moves toward the distal end of the needle tube of the medical needle 2 by a wedge action, and the ring piece distal end surface 6b
By pressing the base end surface of the hub 22 of the medical needle 2, the medical needle 2 can be detached from the syringe body 11.

In addition, the outer periphery of the distal end opening 11a of the syringe main body 11 has a ring piece detachment prevention protrusion 11f, and the ring piece 6
It is the same as the first invention in that it has a stop projection 6c that fits over the outer surface of the distal end opening 11a beyond f and prevents the ring piece 6 from being detached.

[Effect] As described above, according to the injection device with the injection needle separation mechanism according to the first to fourth inventions of the present application, the ring piece, the nut, the detaching member or the ring piece is the distal end face of the large diameter portion of the syringe body. And the hub of the medical needle, and fitted to the opening of the distal end of the syringe body, and rotating the ring piece or the nut to obtain a moving force in the distal direction of the needle tube, or sandwiching the detaching member. By applying pressure to expand and deform, the hub base end face can be pressed, so that the syringe and the medical needle can be easily separated after use, and can be easily discarded separately.

[Brief description of the drawings]

1 (a) and 1 (b) relate to an embodiment of an injection device with an injection needle separation mechanism according to the first invention of the present application. FIG. 1 (a) is a front view, and FIG. FIG. FIG. 2 is a front view of an injection device with an injection needle separation mechanism according to an embodiment of the second invention of the present application. FIG. 3 is a front view of an injection device with an injection needle separation mechanism according to an embodiment of the third invention of the present application. FIG. 4 is a front view of an injection device with an injection needle separation mechanism according to an embodiment of the fourth invention of the present application. DESCRIPTION OF SYMBOLS 1 ... Syringe, 11 ... Syringe body, 11a ... Tip opening, 1
1b: Large-diameter end surface, 11c: Hub pressing projection, 11d: Male thread, 11f: Ring piece, etc. preventing projection, 11e: Hub pressing projection, 12: Presser, 2: Medical needle, 21 ... Needle tube, 22 hub, 22a tapered hole, 3 ring piece, 3a moving projection, 3b ring piece tip surface, 3c stopping projection, 4 ...
Nut, 4a: Stopping projection, 5: Detachment member, 5a, 5a: Finger contact pressure section, 5b: Axial expansion deformation section, 5c: Engagement section, 6 ...
Ring piece, 6a… Concave face, 6b… Ring piece tip face,

Claims (4)

(57) [Claims] A syringe having a pusher with a gasket attached to the tip of a syringe body and a tip thereof, wherein the gasket attached to the tip of the pusher is pushed into the interior of the syringe body from the base end opening so as to be in close contact with the entire circumference. A medical needle comprising a needle tube and a hub that supports the base end of the needle tube and has a tapered hole, and the tapered hole is fitted to a male tapered surface of the outer surface of the distal end opening of the syringe body. A ring piece for moving the medical needle so as to come into contact with a base end face of the hub of the medical needle after use and detaching the medical needle from the syringe main body, a large-diameter portion distal end face of the syringe main body. And the hub of the medical needle, and is fitted to the tip opening of the syringe body, wherein the syringe body is protruded from the large diameter portion tip surface and one or more surrounding the tip opening Yamagata The ring piece has a required mountain-shaped moving projection which is engaged with the hub pressing projection of the syringe body on the base end face, and the ring piece is used after the use. When rotated relative to the syringe main body, the medical needle moves toward the distal end of the needle tube of the medical needle due to the wedge action generated between the projections, and presses the base end surface of the hub of the medical needle with the ring peak distal end surface to perform medical treatment. An injection device with an injection needle separation mechanism, wherein the injection needle is detached from the syringe body. 2. A syringe having a pusher with a gasket attached to the tip of the syringe body and a distal end of the syringe body. The gasket attached to the tip of the pusher is pushed into the syringe body from the base end opening so as to be in close contact with the entire circumference. A medical needle comprising a needle tube and a hub that supports the base end of the needle tube and has a tapered hole, and the tapered hole is fitted to a male tapered surface of the outer surface of the distal end opening of the syringe body. An injection device comprising: a male screw portion formed at an outer surface base end portion of a distal end opening portion of the syringe main body; and the male screw portion is configured to rotate the medical needle when used in a predetermined direction after use. An injection device with an injection needle separating mechanism, wherein a nut that moves toward the distal end of the needle tube so as to abut the base end surface of the hub and detaches the medical needle from the syringe body is screwed. 3. A syringe having a pusher with a gasket attached to the tip of the syringe body and a tip thereof, wherein the gasket attached to the tip of the pusher is pushed into the syringe body from the base end opening so as to be in close contact with the entire circumference. A medical needle comprising a needle tube and a hub that supports the base end of the needle tube and has a tapered hole, and the tapered hole is fitted to a male tapered surface of the outer surface of the distal end opening of the syringe body. An injection device comprising: a detaching member that moves so as to abut a base end surface of a hub of the medical needle after use and detaches the medical needle from the syringe main body; Between the surface and the hub of the medical needle, and is fitted into the distal end opening of the syringe body, the detachment member is a finger contact pressure section on both sides in a direction perpendicular to the axis of the injection device With When the finger contact pressure portion is squeezed, it has an axial expansion deformation portion that bends and deforms so that the distance between the end surfaces of the base end surface and the tip surface increases, and when the axial expansion deformation portion is deformed after use, The axial expansion deformation portion increases a distance between a distal end surface of the large diameter portion of the syringe main body and a base end surface of the hub of the medical needle, and detaches the medical needle from the syringe main body. Do,
Injection device with injection needle separation mechanism. 4. A syringe body having a distal end opening at an eccentric position of the large diameter portion distal end surface, and a pusher having a gasket attached to the distal end thereof. A syringe which is pressed in such a manner that a gasket attached to the distal end is brought into close contact with the entire circumference; a needle tube and a base end of the needle tube which are supported and which have a tapered hole; A medical needle comprising a hub fitted on the male tapered surface of the medical needle, wherein after use, the medical needle is moved so as to come into contact with a base end face of the hub of the medical needle, and the medical needle is moved into a syringe body. A ring piece to be detached from the large diameter portion distal end surface of the syringe main body and the hub of the medical needle, and fitted to the distal end opening of the syringe main body, the syringe main body has a large diameter On the tip The ring piece has a concave surface whose base end face is engaged with the hub pressing protrusion of the syringe body, and the ring piece is a distal end of the syringe body after use. When the medical needle is rotated around the opening, it moves toward the distal end of the needle tube of the medical needle due to the wedge action generated between the hub pressing projection and the concave surface, and the hub of the medical needle at the ring piece distal end surface. An injection device with an injection needle separation mechanism, wherein the medical needle is detached from the syringe body by pressing a base end surface of the injection needle.