JPH0919498A - Disposing tool for injection needle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To safely dispose a used injecting tool and prevent infection of adherent bacteria or virus by unjust reuse of an injection needle. SOLUTION: A protecting cylinder 11 has deforming means 17 and holding means 20. An injecting tool 1 is inserted thereto, the tip of an injection needle 5 is collided with the hard deforming means 17, and bending-deformed, the holding means 20 formed of a projection 19 is pressed onto an injection cylinder 4 so that it is never easily slipped out. The injection needle 5 can be enclosed and safely disposed, and the injection needle 5 cannot be reused because it is bending-deformed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disposal device for an injection needle, which disposes a used injection device so that the injection needle cannot be reused and can be safely handled by a person concerned at a medical site or a collection / disposal site. It is about.

[0002]

2. Description of the Related Art An injection device used for medical treatment is provided with an entire injection device or needle in order to prevent bacteria, viruses, etc. attached to the injection needle from infecting the next patient. It is made disposable. In this case, during the period from immediately after use to the completion of disposal by incineration, etc.
A container with a separating mechanism has been proposed which allows the needle of an injection device immediately after use to be separated from the injection cylinder without touching it directly with a hand and accommodated in the container so that it can be handled in a safe state until the completion of disposal ( (See JP-A-1-52480 and JP-A-1-136665).

[0003]

The above-mentioned container with a separating mechanism has a portion for inserting an injection needle into the container mouth and hooking the needle base, and the injection needle is pulled by hooking the needle base and pulling the injection cylinder. It is configured to be separated and stored as it is in the container, which is considered to be highly safe for concerned parties.

[0004] However, it is common for a large number of separated injection needles to be left in a container for a long time at a medical site, a storage place for collected items, a disposal site, etc., waiting for transportation, incineration, etc. It is not possible to completely prevent the unforeseen circumstances of being illegally collected and reused by illicit traders and used by drug addicts, and it is not possible to prevent large numbers of people from being involved. There is a risk of infection.

[0005]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problem that a discarded injection needle may be inappropriately reused, and enables safe handling of used injection needle and prevention of inappropriate reuse. In order to make both of them compatible with each other, for that purpose, at least a protective cylinder having a length that wraps the entire injection needle is provided with a deforming means for bending the needle tip unusably and a holding means for preventing the deformed injection needle from accidentally coming out. I prepared it.

That is, the injection needle of the used injection device is inserted into the protective cylinder as it is from the proximal end side without separating from the injection cylinder, the needle tip is bent and deformed by the deforming means, and the holding means is not prepared. Hold the needle or syringe barrel so that it does not come out easily. As a result, the used needle can be safely discarded without the risk of being infected with bacteria or viruses by injuring the person concerned and the needle tip being bent even if it is improperly reused. Therefore, there is no need to worry about the infection of people other than those involved.

It should be noted that the injection needle is inserted deep into the protective cylinder and the tip of the needle is abutted against a hard part which is a deforming means. After the needle is inserted into the protective cylinder, the distal end portion is moved in the proximal direction to make it hard. By bending the shaft piece by inserting the shaft piece into the insertion hole of the shaft piece, which is a deforming means provided in the protective cylinder, which is abutted against the part piece, the shaft piece is unusable. Further, the deformed injection needle is wrapped in the protective barrel while being connected to the barrel, or separated from the barrel and wrapped in the protective barrel.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of each claimed invention will be described below with reference to the drawings.

1 (A), (B), (C), and (D) show the waste disposal tool of the invention described in claims 1, 2, 9 and 11, and the injection tool to which it is applied, and its operation. It is a figure explaining a procedure and.

As shown in FIG. 1 (A), the injection device 1 is a well-known device including an injection cylinder 4 fitted with a piston 2 and an injection needle 5 fitted and connected at the tip thereof. The piston rod 3 and the injection cylinder 4 are made of glass and are repeatedly used, or they are made of glass or synthetic resin and a predetermined amount of the medicinal solution is pre-filled therein and is disposable after one use. Thing (JP-A-58-19)
No. 267), a cartridge equipped with a piston and equipped with a predetermined drug solution is fitted in a cylindrical holder to which an injection needle is connected, and is disposable after one use (actual opening No. 2-). The present invention is also applied to (see Japanese Patent No. 55958).

The waste disposal tool shown in FIG. 1B comprises a protective cylinder 11 made of a general-purpose thermoplastic synthetic resin such as polyethylene, polypropylene, or polystyrene, and a highly rigid synthetic resin such as polycarbonate. It is formed by two parts including a hard piece 18 made of metal.

The protective cylinder 11 including the needle base 6 is integrally molded through a small-diameter cylinder portion 12 having a length shorter than the entire length of the injection needle 5 and a step portion 13 perpendicular to the central axis at its base end. Tube 4
A large-diameter cylindrical portion 14 having a length to fit the distal end portion of the same, and a trumpet-shaped receiving opening 1 which is integrally molded at the base end and expands in a conical shape.
5. The small-diameter cylindrical portion 12 is formed to have an inner diameter that fits the flange 7 of the needle base 6 with almost no space, and a disk-shaped hard portion piece 18 is fitted on the tip wall 16 to form a deforming means 17. There is. The large-diameter cylinder portion 14 is formed to have an inner diameter that allows the injection cylinder 4 to be loosely fitted thereto, and an annular projection 19 having a mountain diameter slightly smaller than that of the injection cylinder 4 is provided on the inner peripheral surface of the intermediate portion to hold the holding means 20. Is formed.

When the injection device 1 is used and the injection needle 5 is inserted from the receiving port 15 through the large-diameter cylinder portion 14 into the small-diameter cylinder portion 12 as it is, when the distal end surface of the injection cylinder 4 collides with the projection 19, it becomes large. It stops due to resistance, and at this time (C) in Fig. 1
As shown in, the tip of the injection needle 5 is separated from the hard part 18.

Next, when a strong force is applied to push it in, the injection cylinder 4
Moves beyond the projection 19, the large-diameter cylindrical portion 14 is expanded and the elastic restoring force causes the projection 19 to come into pressure contact with the outer peripheral surface of the injection cylinder 4. When the injection needle 5 approaches the hard portion piece 18, then hits the tip portion and is bent, and when further pushed, it is gradually and irregularly bent, and the tip surface of the injection barrel 4 hits the step portion 13 and stops. The state becomes as shown in (D) of 1.

The projection 19 of the injection cylinder 4 is in pressure contact with the protection cylinder 1
Since it is hard to get out of 1, discard it as it is and incinerate it. Even if a person who intends to reuse the product unjustly pulls it out, it can be seen at a glance that it cannot be used because the injection needle 5 is bent and deformed, and infection of adherent bacteria, viruses, etc. due to improper use is prevented. The Rukoto.

2A, 2B and 2C are views for explaining the waste disposal tool of the invention described in claims 1, 3, 9 and 10 and its operating procedure.

In the waste disposal tool shown in FIG. 2A, the deforming means 17, the holding means 20, and the fixing means 23 are provided on the protective cylinder 11 made of high-hardness polycarbonate in thermoplastic synthetic resin. It is formed by one component provided by integral molding.

The protective cylinder 11 comprises a small-diameter cylindrical portion 12, a large-diameter cylindrical portion 14, and a receiving port 15 which have substantially the same dimensions as the protective cylindrical body 11 shown in FIG. Via the conical slope 21. The tip wall 16 has a thick wall and has a conical projection 22 toward the inside of the small-diameter cylindrical portion 12 to form a deforming means 17, and
The large-diameter cylindrical portion 14 is provided with a holding means 20 composed of an annular projection 19 similar to that shown in FIG.
Two annular protrusions 24 having a diameter slightly smaller than that of the outer peripheral surface of the needle base of the injection needle are provided on the inner peripheral surface thereof to form the fixing means 23.

The same injection device 1 as shown in FIG. 1 (A)
When the injection needle 5 is directly inserted from the receiving port 15 through the large-diameter cylindrical portion 14 into the small-diameter cylindrical portion 12, the injection cylinder 4
The tip surface of the sword collides with the protrusion 19 and temporarily stops.
The tip of the injection needle 5 is separated from the protrusion 22 as shown in FIG.

Next, when a strong force is applied to push the syringe barrel 4,
Moves beyond the projection 19, the large-diameter cylindrical portion 14 is expanded and the elastic restoring force causes the projection 19 to come into pressure contact with the outer peripheral surface of the injection cylinder 4. The injection needle 5 approaches the protrusion 22, and then the distal end is guided by the conical surface and abuts against the distal end wall 16 at the proximal end thereof to be in a curved state, and further pushing causes it to be gradually increased and irregularly bent. When the needle base 6 is press-fitted into the protrusion 24 of the inclined portion 21 and the tip of the injection cylinder 4 hits the inclined portion 21 and stops, the state shown in FIG. 2C is obtained.

The projection 19 of the injection cylinder 4 is pressed into contact therewith, so that the protective cylinder 1 is protected.
Since it is hard to get out of 1, discard it as it is and incinerate it. When a person who intends to reuse the needle pulls it out, the tip of the injection needle 5 is pierced into the tip wall 16 and the projection 24 pressed against the needle base 6 acts as a stopper so that the injection cylinder 4 is separated and pulled out. The injection needle 5 remains fixed inside the protective cylinder 11. Further, even if the injection needle 5 is pulled out, it cannot be used because it is deformed and bent. The injection needle 5 of FIG. 2 is more difficult to pull out than the injection needle of FIG. 1, and infection of adherent bacteria, viruses and the like due to improper use can be more effectively prevented.

3 (A), (B), (C) and (D) show the waste disposal tool of the invention described in claims 1, 4, 9 and 11 and the injection tool to which it is applied, and its operation. It is a figure explaining a procedure and.

As shown in FIG. 3 (A), the injection tool 1 is composed of an injection cylinder 4 fitted with a piston 2 and an injection needle 5 screwed to the tip thereof, and is generally called a lock syringe. In order to carry out the present invention, the injection needle 5 is a well-known one similar to the one shown in (A) of FIG. 4 is provided with an engaging projection 9 having a height substantially equal to that of the outer peripheral surface of 4.

The disposal tool shown in FIG. 3B is shown in FIG.
The protective cylinder 11 and the hard piece 18 are similar to those shown in FIG.

The protective cylinder 11 is composed of a small-diameter cylindrical portion 12, a right-angled step portion 13, a large-diameter cylindrical portion 14, and a receiving port 15 which have substantially the same dimensions as those shown in FIG. Is a hard piece 1 having a conical recess 26 overlying its tip wall 16.
8 is fitted to form the deforming means 17, and
The large-diameter cylindrical portion 14 is formed with a holding means 20 composed of an annular projection 19 similar to that shown in FIG. Furthermore, the protrusion 19
Between the stepped portion 13 and the stepped portion 13, there is provided a spiral guiding means 27 having two threads of a female thread 28 having a thread height almost equal to that of the protrusion 19 and having a phase shift of 180 degrees.

When the injection device 1 shown in FIG. 3A is used, the injection needle 5 is directly inserted from the receiving port 15 into the large-diameter cylindrical portion 14.
When it is inserted into the small-diameter cylindrical portion 12 via the
9 and stops once, and at this time, the tip of the injection needle 5 is separated from the hard piece 18 as shown in FIG.

Next, when a strong force is applied to rotate while pushing, the engaging projection 9 is engaged with the female screw 28, the injection cylinder 4 subsequently moves over the projection 19, and the injection needle 5 is moved. When the engaging projection 9 abuts on the stepped portion 13 and stops as it approaches the hard portion piece 18 while rotating, and the tip is abutted against the bottom of the depression 26, it is gradually and irregularly bent. The state becomes as shown in D).

Since the injection cylinder 4 is more difficult to come out than the injection cylinder 4 shown in FIGS. 1 and 2 due to the female screw 28 being pressed against the projection 19, it is discarded and incinerated as it is. The engaging projection 9 and the female screw 28 make it more difficult to pull out the injection needle 5 than that of the needle base 6 and the projection 24 shown in FIG. However, it cannot be used because the injection needle 5 is deformed and bent.

FIGS. 4A, 4B, and 4C are views for explaining the waste disposal tool of the invention described in claims 1, 5, 6 and 11 and its operating procedure.

The disposal tool shown in FIG. 4 (A) is formed by two parts, a protective cylinder 11 and a hard piece 18 made of the same synthetic resin as those shown in FIGS. And is applied to the same injection device shown in FIG. 1 (A).

The protective cylinder 11 is integrally molded through a small-diameter cylinder 12 having an inner diameter into which the flange of the needle base is fitted with almost no gap, and a step 13 at a right angle to the base end of the cylinder. A large-diameter cylindrical portion 14 that is loosely fitted and a large-diameter hole portion 30 formed on the inner peripheral surface of the distal end portion of the small-diameter cylindrical portion 12 are fitted with a flange 31 at the base end so that the small-diameter cylindrical portion 12 is slidable in the axial direction. And an abutting tube portion 32 that is projected to the front thereof. When the butting cylinder portion 32 is projected to the maximum forward from the small diameter cylinder portion 12, the total length thereof is larger than the total length including the needle base of the injection needle. Then, the butting cylinder portion 3
A disc-shaped hard piece 1 is overlaid on a wall 33 whose tip is closed.
8 is fitted to form a deforming means 17, and the large-diameter cylindrical portion 14 is provided with a holding means 20 composed of an annular projection 19 similar to those in FIGS. 1, 2 and 3. There is.

The same injection device 1 as shown in FIG. 1 (A)
When the injection needle 5 is inserted into the small-diameter cylinder portion 12 from the large-diameter cylinder portion 14 as it is, the injection cylinder 4 is fitted into the large-diameter cylinder portion 14 until it gets over the projection 19 and the tip surface hits the step portion 13. The tip end of the injection needle 5 is separated from the hard piece 18 as shown in FIG.

Then, when the injection cylinder 4 is pressed against the stepped portion 13, the abutting cylinder 32 is pushed with a strong force in the direction of retracting it into the small diameter cylinder 12, and the hard piece 18 causes the tip of the injection needle 5 to be retracted. When is pressed, it is gradually and irregularly bent, and when it is deepestly immersed, the state shown in FIG. 4C is obtained.

The projection 19 is pressed against the injection cylinder 4 so that the protection cylinder 1 is protected.
Since it is hard to get out of 1, discard it as it is and incinerate it. Even if a person who intends to reuse the product unjustly pulls it out, it can be seen at a glance that it cannot be used because the injection needle 5 is bent and deformed, and infection of adherent bacteria, viruses, etc. due to improper use is prevented. This is the same as that of FIG.

(A) and (B) of FIG.
It is a figure explaining the disposal processing tool of the invention described in 10 and 10, and its operation procedure.

The discarding tool shown in FIG. 5A is shown in FIG.
In comparison with the above, the point at which the male screw 36 formed on the butting cylinder 32 is screwed onto the female screw 35 formed at the tip of the small-diameter cylinder 12 and screwed so as to move axially, and the tip of the butting cylinder 32. It is exactly the same except that the deforming means 17 is formed by providing a spherical recess 37 having a thick wall 33 that closes the wall. The butting cylinder portions 32 are made of high hardness synthetic resin such as polycarbonate or metal.

Then, the abutting cylinder portion 32 is projected to the front of the small diameter cylinder portion 12 so as to be longer than the entire length including the needle base of the injection needle, and the same injection tool as shown in FIG. 1 (A). 1 is inserted from the large-diameter cylindrical portion 14 as it is, and the pressing cylindrical portion 32 is screwed into the small-diameter cylindrical portion 12 while the distal end surface of the injection cylinder 4 is pressed against the step portion 13. The tip of the injection needle 5 comes into contact with the bottom of the depression 37 and is bent, and when it is gradually and irregularly bent and screwed deepest,
(B) of FIG.

The projection 19 is pressed against the injection cylinder 4 so that the protection cylinder 1 is protected.
It is the same as that shown in FIG. 4 in that it is difficult to be pulled out from 1, and that the injection needle 5 is bent and cannot be used even if it is pulled out, but the abutting cylinder portion 32 is rotated while being rotated by a screw. Since the small-diameter cylindrical portion 12 is forcibly immersed, there is an advantage that the injection needle 5 can be easily and surely bent.

FIGS. 6A, 6B, and 6C are views for explaining the waste disposal tool of the invention described in claims 1, 8 and 9 and its operating procedure.

The discarding tool shown in FIG. 6A is a shaft having a protective cylinder 11 made of the same synthetic resin as that shown in the above figures, a needle tip insertion hole 41 and a knob 42. It is formed by two parts such as the piece 43.

The protective cylinder 11 is slightly shorter than the entire length of the injection needle including the needle base, has an inner diameter capable of fitting the needle base, and has a small-diameter cylinder portion 12 whose tip is closed by a wall 16, It is composed of a large-diameter cylindrical portion 14 which is integrally molded to the base end thereof via a step portion 13 at a right angle and loosely fits the distal end portion of the injection cylinder.

The shaft piece 43 is rotatably supported by penetrating the small-diameter cylindrical portion 12 at the front end thereof so as to be orthogonal to the central axis thereof,
The insertion hole 41 is located on the central axis of the small-diameter cylindrical portion 12, and the knob 42 is provided on the protruding end of the shaft piece 43.

The same injection device 1 as shown in FIG. 1 (A)
When the injection needle 5 is used, the insertion hole 41 is directed toward the central axis direction of the small-diameter cylindrical portion 12, and the injection needle 5 is moved from the large-diameter cylindrical portion 14 to the small-diameter cylindrical portion 12.
Insert until it hits the tip wall 16. At this time, as shown in FIG. 6B, the tip of the injection needle 5 is inserted into the insertion hole 41, and the tip of the injection cylinder 4 is fitted into the large diameter cylinder 14.
Therefore, the injection tool 1 is in a state of being fitted in the protective cylinder 11 with a slight rattling.

Next, when the shaft piece 43 is rotated by holding the knob 42 at an appropriate angle, generally in the range of 90 to 180 degrees, the needle tip inserted into the insertion hole 41 is bent by 90 degrees or more. As shown in FIG. 6C, the injection needle 5 has a shaft piece 43.
It will be in the state of being hooked on.

When the injection cylinder 4 is pulled in the proximal direction, it is pulled out from the needle base 6 and easily separated from the injection needle 5, so that the injection is wrapped in the protection cylinder 11 and locked to the shaft piece 43. Either the needle 5 and the syringe barrel 4 are discarded separately, or the syringe barrel 4 is repeatedly used.

The shaft piece 43 having the insertion hole 41 is the combined means 40 which also serves as a means for deforming the needle tip and a means for holding the deformed injection needle 5 in the protective cylinder 11. Understood by.

Further, even if a person who intends to re-use it unjustly rotates the knob 42 in the reverse direction to take out the injection needle 5, the needle tip which is once largely bent cannot be restored and cannot be used.

Although the preferred embodiments of the inventions of the claims described in the claims have been described above, the used injection needle 5 is transferred to the protective cylinder 11 without fear of injuring a finger having the protective cylinder 11. The receiving port 15 to be inserted need not be the one shown in FIG. 4, FIG. 5 and FIG. Also, the small-diameter cylindrical portion 11
The deforming means 17 provided on the distal end wall 16 of the injection needle 5 bends and deforms at least the needle tip of the injection needle 5 unusably, and therefore the distal end wall 16 itself or the hard part 18 superposed on it.
The material and shape of are not limited to those shown in the figure, and can be arbitrarily selected. Further, it goes without saying that the abutting cylinder portion 32 of the protection cylinder body 11 shown in FIGS. 4 and 5 may be externally fitted to the small-diameter cylinder portion 12 instead of being internally fitted, for example.

Since the injection needle 5 is generally stored separately from the injection cylinder 4 and is joined immediately before use, the protective cylinder 11 of the present invention is hung on the injection needle 5 or the protection needle 11 of the injection needle 5. It can be easily supplied to medical personnel by using it for packaging.

[0050]

As will be understood from the above description, according to the present invention, the means for deforming the needle tip and the entire injection tool or the means for holding the injection needle are provided in the protective cylinder that wraps the injection needle, and the used injection is used. Not only can it be safely processed without worrying about touching the needle directly or scratching the fingertips, but since it cannot be reused improperly, there is no risk of infecting people other than those concerned with attached bacteria or viruses, which is extremely safe. It is expensive.

[Brief description of the drawings]

FIG. 1A is a front view of an injection device applied to the present invention,
(B) is a longitudinal sectional view of the first embodiment of the present invention, and (C) and (D) are longitudinal sectional views for explaining an operating procedure.

FIG. 2A is a longitudinal sectional view of a second embodiment of the present invention,
(B) And (C) is a longitudinal section explaining an operation procedure.

FIG. 3A is a front view of an injection device applied to the present invention,
(B) is a longitudinal sectional view of a third embodiment of the present invention, and (C) and (D) are longitudinal sectional views for explaining an operating procedure.

FIG. 4A is a longitudinal sectional view of a fourth embodiment of the present invention,
(B) And (C) is a longitudinal section explaining an operation procedure.

FIG. 5A is a longitudinal sectional view of a fifth embodiment of the present invention,
(B) is a vertical cross-sectional view illustrating an operation procedure.

FIG. 6A is a vertical cross-sectional view of a sixth embodiment of the present invention,
(B) And (C) is a longitudinal section explaining an operation procedure.

[Explanation of symbols]

11 protection cylinder, 12 small diameter cylinder, 13 steps, 14
Large-diameter cylindrical part, 15 receiving port, 16 tip wall, 17 deforming means, 18 hard part piece, 19 protrusion, 20 holding means, 2
3 fixing means, 24 protrusions, 27 spiral guiding means, 32
Abutting cylinder portion, 40 combined use means, 41 insertion hole, 43
Shaft piece,

Claims (11)

[Claims] 1. A protective cylinder having a length including at least the entire injection needle and allowing the injection needle to be inserted from a proximal end side, and a needle tip deforming means provided at a distal end portion of the protective cylinder. And a means for holding an injection tool provided on the protective cylinder, the disposal tool for an injection needle. 2. An injection needle is inserted from the proximal end side of the large-diameter cylinder portion, which has a small-diameter cylindrical portion having a closed tip and a length shorter than the entire length of the injection needle and a large-diameter cylindrical portion into which the distal end portion of the injection cylinder can be fitted. A protective cylinder, a deforming means formed of a hard piece for pushing and bending the injection needle, which is provided at the closed tip of the small diameter cylinder, and an outer circumference of the injection cylinder, which is provided on the inner peripheral surface of the large diameter cylinder. And a holding means composed of a protrusion that presses against the surface, and the needle tip of the injection needle is pushed into the hard part by inserting the injection barrel into the large-diameter cylindrical portion and pushing in with the protrusion in pressure contact. A disposal tool for an injection needle, which is configured to be applied and bent. 3. The waste disposal tool according to claim 2, wherein, in addition to the deforming means and the holding means, a needle of an injection needle is provided on an inner peripheral surface of a transition portion from the small diameter tubular portion to the large diameter tubular portion. An instrument for disposing of an injection needle, comprising a fixing means composed of a protrusion in pressure contact with a base outer peripheral surface, and configured to internally fix an injection needle having a bent needle tip in the small-diameter cylindrical portion. . 4. The disposal tool according to claim 2, wherein, in addition to the deforming means and the holding means, a needle base of an injection needle is provided on the inner peripheral surface of the large-diameter tubular portion on the tip side of the holding means. An injection needle disposal device, characterized in that it is provided with a spiral guiding means to be fitted, and is configured to abut against the rigid portion piece while rotating the injection needle and bend it. 5. A large-diameter cylinder having a small-diameter cylinder for wrapping an injection needle and a large-diameter cylinder having an abutting cylinder whose end is closed so as to be movable in the axial direction, and a large-diameter cylinder for fitting the injection-cylinder tip. A protective cylinder body into which an injection needle can be inserted from the base end side of the cylinder part, a deforming means consisting of a hard piece provided at the closed distal end of the butting cylinder part for pushing and bending the injection needle, and the large diameter cylinder part Holding means comprising a protrusion provided on the inner peripheral surface and in pressure contact with the outer peripheral surface of the injection cylinder,
And a step portion formed at a transition portion from the small-diameter tubular portion to the large-diameter tubular portion.The injection barrel is fitted to the large-diameter tubular portion and the projection is pressed against the step portion. A disposal tool for an injection needle, characterized in that it is configured such that the hard part piece is pressed against the injection needle and bent while moving the contacting tubular portion in the proximal direction in the contact state. 6. The disposal tool for an injection needle according to claim 5, wherein the butting cylinder is axially slidably coupled to the small diameter cylinder. 7. The disposal tool for an injection needle according to claim 5, wherein the butting cylinder is screwed to the small diameter cylinder so as to be axially movable. 8. A protective cylinder having a length that encloses at least the entire injection needle and into which the injection needle can be inserted from the base end side, and a shaft piece having an insertion hole for the injection needle, the distal end of the protection cylinder. And a means for holding the deformed injection needle, which is rotatably supported by the needle, and the needle is protected by the insertion and bending of the needle tip into the engagement hole. A disposal device for an injection needle, which is configured to be retained in a cylinder. 9. The discarding tool for an injection needle according to claim 1, 2, 3, 4, 5, or 8, wherein the protective cylinder has a receiving opening that expands in a conical shape at the base end. 10. The discarding tool for an injection needle according to any one of claims 1, 2, 3, 4, and 5, wherein the deforming means is a hard piece composed of a tip wall of the protective cylinder. 11. The disposal tool for an injection needle according to claim 1, wherein the deforming means is a hard piece overlapped with a tip wall of the protective cylinder.