TW201313267A - Single use syringe - Google Patents

Abstract

A single use syringe mainly comprises a plunger arm, a plunger tip, a syringe body, and a tip retaining sleeve. The tip retaining sleeve is surroundingly disposed to a circumference of a tip retaining arm of the plunger tip in order to have the tip retaining arm engaged to the plunger arm. When a user pull back the plunger arm, sleeve rib on the tip retaining sleeve is locked to the syringe body, so as to limit the tip retaining sleeve from being pushed forward again. Under this condition, if a user presses the plunger arm, the tip retaining arm starts to disengage from a fitting range of the tip retaining sleeve making the plunger arm and the plunger tip separated from each other. After the plunger arm and the plunger tip are separated from each other, the plunger arm and the plunger tip can not be re-engaged again. Accordingly, the single use syringe can achieve the objective of not being reused.

Description

Disposable syringe

The present invention relates to a medical syringe, and more particularly to a disposable syringe that is both safe and efficient to ensure that it cannot be reused.

A syringe is a fairly common medical product that injects a drug into a patient to achieve a medical treatment. In general, a medical professional first introduces the drug into the syringe and then injects the drug into the patient through a needle on the syringe.

There are many potential risk factors for conventional syringes in terms of actual use. When used improperly, it will cause very serious damage and adverse effects on the patient's health.

Among them, a major problem is that the conventional syringe is extremely easy to have a problem of repeated use because the conventional syringe is structurally incapable of being reused, so that the syringe can be easily reused by a person of interest.

For example, when a syringe injects a drug into a patient, the patient's blood, residual drugs, bacteria, viruses, or other pathogenic substances may remain on the syringe or its needle. When the same syringe is used again on the second patient, the second patient may be infected with the pathogen of the previous patient.

If the first patient is infected with a virus, the second patient will probably be infected with the same virus because they share the syringe with the first patient. Alternatively, the second patient may also have an allergy response to the medication used by the first patient.

Furthermore, if the appearance of the syringe is simple, it is difficult for medical personnel to judge whether it is already a used syringe.

Therefore, in view of the above, it is one of the problems that is well known to those skilled in the art to provide a syringe that is both safe and effective and that can not be used twice.

In order to solve the problems of the prior art, the main object of the present invention is to provide an anti-A A versatile disposable syringe that automatically locks and automatically cuts off its internal components after injection, thereby effectively preventing the syringe from being reused.

The disposable syringe disclosed in the present invention comprises: a piston arm, a piston end, a syringe body, and a fixing sleeve. Wherein, the piston arm comprises a rod member, and the rod member can be inserted into an accommodating space in the base of the piston end. The fixed sleeve is wrapped around the protruding tip disposed at the end of the piston, whereby the retaining sleeve allows the protruding tip to engage the piston arm.

When a user pulls back the piston arm of the syringe, the sleeve rib on the retaining sleeve will snap into the syringe body, whereby the movement of the retaining sleeve will be restricted and cannot be advanced further.

If the user begins to push the piston arm of the syringe forward, the protruding tip will begin to disengage from the sleeve of the fixed sleeve such that the protruding tip thus begins to separate from the piston arm. After the protruding tip and the piston arm are no longer engaged, the user can still push the piston end forward by pushing the rod of the piston arm until the piston end abuts against the front end of the syringe body. However, in accordance with an embodiment of the present invention, once the piston end is disengaged from the piston arm, the two will not be able to engage again. Also, the piston end cannot be pulled back again. Therefore, the disposable syringe proposed by the present invention achieves the purpose of avoiding repeated use of the syringe.

The piston arm disclosed in the present invention can form a positioning system together with the syringe body, mainly for fixing the position of the piston arm in the syringe and preventing the displacement of the piston arm during the transportation of the syringe. When the syringe is delivered to the destination and the medical personnel are ready to begin use, the medical personnel can unscrew the piston arm to unlock the positioned piston module. After that, the medical staff can smoothly pull back the piston arm to introduce the drug to be injected into the syringe.

Secondly, in accordance with an embodiment of the present invention, the piston arm may further have an indicator of use. In an embodiment, the usage indicator may include, for example, the letters "USED"; or, the indicator may be used to display a higher brightness color. When the syringe has been used, the indicator will display the words "USED" above, or show a clear chroma. Thereby, the user can determine whether the syringe has been used by interpreting the use indicator.

In summary, the disposable syringe proposed by the present invention can not only avoid medical personnel Repeated use of the same syringe can effectively inhibit the possibility of a needle being shared by drug users or drug abusers.

In addition, disposable syringes disclosed in accordance with the present invention can be used to reduce the risk of the user sharing medication and needles. Even if the user does not legally recycle or discard the syringe after the application of the medicine, the disposable syringe disclosed in the present invention can effectively prevent the next user from reusing.

The purpose, technical contents, features and effects achieved by the present invention will be more readily understood by the detailed description of the embodiments and the accompanying drawings.

The above description of the present invention is intended to be illustrative and illustrative of the spirit and principles of the invention, and to provide further explanation of the scope of the invention. The features, implementations, and utilities of the present invention are described in detail with reference to the preferred embodiments.

The single use syringe disclosed by the present invention mainly includes: a plunger assembly, a tip retaining sleeve, and a syringe body.

The piston module described above includes a plunger arm and a plunger tip, and the piston end and the piston arm are selectively detachable or combined. In general, medical personnel mainly use the piston module to introduce the drug into the body of the syringe, after which the medical personnel can inject the drug into the patient.

For the following description, please refer to the 1A to 1F drawings. 1A, 1B, and 1C are respectively a cross-sectional view, a side view, and a rear view of a piston arm of a disposable syringe according to the present invention. 1D is a cross-sectional view of a hand held portion of a piston arm of a disposable syringe in accordance with the present invention. Figure 1E is a side elevational view of the piston arm hand of a disposable syringe in accordance with the present invention. Figure 1F is a rear elevational view of the hand grip of the piston arm of the disposable syringe proposed in accordance with the present invention.

As shown in FIGS. 1A to 1F, the piston arm 100 includes a plunger knob 110, a plunger stem 120, and a tip flange. 122, and a bar (arm post 140).

According to an embodiment of the present invention, as shown in FIG. 1D to FIG. 1F, the hand-held portion 110 further has at least one thread tip 111. The function of the thread 111 is to make the hand-held portion 110 lock. The thread 112 is attached to the handle 120. In other words, the present invention locks the hand piece 110 and the connecting handle 120 together by the two sets of threads 111, 112 disposed correspondingly to each other.

According to another embodiment of the present invention, the manner in which the hand portion 110 and the connecting handle 120 are engaged is not limited to the above-mentioned screwing. The two can of course be held by an ultrasonic welding method. The portion 110 is welded together with the connecting handle 120.

According to an embodiment of the invention, the hand portion 110 is disposed at one end of the connection handle 120. The medical staff or user can pull back the piston arm 100 by the hand portion 110 to introduce the liquid or the drug to be injected into the syringe. Similarly, the medical staff or the user can push the piston arm 100 by the hand portion 110 to discharge the liquid or the drug to be injected from the syringe and inject into the patient's body.

On the other hand, the tip end flange 122 of the piston arm 100 is tied to the rod member 140 at the other end of the connecting shank 120, and its main purpose is to support and fix the piston end in the piston module.

As shown in FIG. 1B, the connecting handle 120 may further include a use indicator 123. For example, the usage indicator 123 can include, for example, the letters "USED"; or, the indicator 123 can be used to display a higher brightness color. According to an embodiment of the invention, the indicator 123 is used to display, for example, the words "USED" above, or to display a significant chroma, after the syringe has been used. Thereby, the user can use the indicator 123 to determine whether the syringe has been used.

Continuing to refer to Figures 3A through 3C, wherein Figure 3A is a cross-sectional view of the piston end of the disposable syringe in accordance with the present invention, and Figure 3B is a side view of the piston end of the disposable syringe in accordance with the present invention. And Figure 3C is a rear view of the piston end of the disposable syringe proposed in accordance with the present invention.

According to the disposable syringe disclosed by the present invention, the piston module further comprises a connection The piston end 300 of the piston arm 100.

As shown in FIGS. 3A-3C, the piston end 300 includes a tip head 310 and a tip base 320. The pedestal 320 has a hollow accommodating space 321 , and the accommodating space 321 can be used to accommodate the rod 140 of FIG. 1A . The base 320 further has one or more tip retaining arms 330. The tip flange 122 of Figure 1C is engageable with the projecting tip 330 whereby the piston end 300 is secured to the piston arm 100 of Figure 1A.

According to an embodiment of the present invention, the accommodating space 321 and the rod member 140 may be spherical.

According to another embodiment of the present invention, the accommodating space 321 and the rod member 140 may also have an angular non-spherical shape to effectively prevent the piston end 300 from being rotated away from the piston arm 100 when the two are engaged. For example, the accommodation space 321 and the rod 140 may be, for example, a rectangle, a triangle, or a hexagon. Therefore, when the rod member 140 is inserted into the accommodating space 321 of the piston end 300, the piston end 300 can only rotate together with the piston arm 100 (shown in FIG. 1A) with which it is engaged, without the piston arm. 100 separation.

In addition, the top end 310 of the piston end 300 can have at least one head ring, thereby increasing the suction between the tip 310 and the syringe body, so that the tip 310 and the syringe body can be more closely attached to each other. together.

Continuing to refer to FIGS. 2A-2C, wherein FIG. 2A is a cross-sectional view of a fixing sleeve of a disposable syringe according to the present invention, and FIG. 2B is a fixing sleeve of a disposable syringe according to the present invention. The side view, and the 2C figure, are rear views of the fixing sleeve of the disposable syringe proposed in accordance with the present invention.

The disposable syringe disclosed in the present invention further includes a fixing sleeve 200. In accordance with an embodiment of the present invention, the fixed sleeve 200 is a tube that surrounds the portion of the piston arm 100 of FIG. 1A and the piston end 300 of FIG. 3A. Wherein, the fixing sleeve 200 can have a plurality of sleeve ribs 225, and each sleeve rib 225 is formed to extend outward from the outer surface of the tube body of the fixing sleeve 200.

According to an embodiment of the present invention, the inner side of the tube of the fixing sleeve 200 may be provided with a groove Or form a depression. Thereby, the user can more easily design or remove the protruding tip 330 or the piston end 300 of the piston module from the fixing sleeve 200.

As shown in FIG. 2A, in an embodiment, the fixing sleeve 200 includes an inner sleeve 230 and an outer sleeve 220. The inner sleeve 230 may be made of plastic, and the outer sleeve 220 may be made of synthetic material. Rubber, and the inner sleeve 230 is sleeved inside the outer sleeve. The inner sleeve 230 can have one or more sleeve tabs 235 for engaging between the inner and outer sleeves 230, 220 to prevent relative sliding therebetween.

In accordance with the present invention, the inner sleeve 230 of this embodiment is primarily used to reduce the friction between the stationary sleeve 200 and the piston arm 100. The sleeve rib 225 on the outer sleeve 220 is further adapted to allow the fixed sleeve 200 to be engaged with the syringe body to prevent the fixed sleeve 200 from slipping out of the syringe body.

Below, please refer to Figures 4A to 4F. 4A is a cross-sectional view of the syringe body of the disposable syringe according to the present invention. Figure 4B is a side elevational view of the syringe body of the disposable syringe disclosed in accordance with the present invention. Figure 4C is a rear elevational view of the syringe body of the disposable syringe disclosed in accordance with the present invention. Figure 4D is a cross-sectional view of the stop block on the syringe body of the disposable syringe in accordance with an embodiment of the present invention. Figure 4E is a side elevational view of the stop block on the syringe body of the disposable syringe in accordance with an embodiment of the present invention. Figure 4F is a rear elevational view of the stop block on the syringe body of the disposable syringe in accordance with an embodiment of the present invention.

The disposable syringe disclosed herein includes a syringe body 400. The syringe body 400 includes a syringe body tip 415, a syringe body wall 410, a body grab flange 450, and a sleeve stopper 460. In accordance with an embodiment of the present invention, the body tip 415 can be configured with a needle (not shown) that can be molded over the body tip 415 to facilitate the injecting of medication into the patient.

In this embodiment, the first body flange 450 is formed extending outwardly from the syringe body 400 of the syringe, which is primarily assisted by a medical professional or user implementing the syringe. For example, when the user pulls back the piston arm by the hand portion 110, the user can A finger is placed over the first body flange 450 to thereby force. As for the user pushing the piston arm by the hand portion 110, the user may also choose to simultaneously place the finger under the first body flange 450 to thereby apply force.

The stop block 460 includes a second body flange 451 that can be engaged with the first body flange 450 and the sleeve stopper wall 461 of the syringe body 400, thereby preventing the 2A and 2B. The fixed sleeve 200 of the figure is withdrawn from the syringe body 400.

According to an embodiment of the present invention, as shown in FIG. 4B, the syringe body 400 can further have one or more scales 411, whereby the user can know how much volume is introduced by interpreting the scale 411 of the contents of the syringe. drug.

Continue to see Figures 5A and 5B, and Figures 6A through 6H. 5A is a cross-sectional view of a disposable syringe according to an embodiment of the present invention, and FIG. 5B is a side view of a disposable syringe according to an embodiment of the present invention. Figures 6A through 6H are schematic illustrations of various stages of a disposable syringe in accordance with an embodiment of the present invention. For the following description, please refer to the above-mentioned 1A to 4F diagrams, which are explained in detail below.

First, as shown in Figures 5A and 5B, it is an overall schematic view of the disposable syringe 10 of the present invention prior to use. In accordance with an embodiment of the present invention, such disposable syringe 10 includes a piston module (piston arm 100 and piston end 300), a stationary sleeve 200, and a syringe body 400.

The piston end 300 is located on the front end of the interior of the syringe body 400. The rod member 140 of the piston arm 100 is engaged in the accommodating space 321 of the base 320 of the piston end 300. The fixed sleeve 200 is wrapped around the protruding tip 330 of the piston end 300 and causes the protruding tip 330 to abut against the tip flange 122, thereby causing the piston end 300 to be secured with the piston arm 100.

In detail, as shown in FIGS. 6A to 6B, when the user pulls back the piston arm 100 by the hand portion 110, in this case, since the protruding tip 330 is still engaged with the tip end flange 122, The piston end 300 is fixed to the piston arm 100 while being pulled back (i.e., in the direction of the lower side of the figure). At this time, the top end 310 of the piston end 300 is pushed together to fix the sleeve. 200, the fixed sleeve 200, the piston end 300 and the piston arm 100 are pulled together.

After the fixation sleeve 200 is moved rearwardly within the syringe body 400, the sleeve rib 225 of the fixation sleeve 200 is in contact with the body wall 410 of the syringe body 400. It should be noted that, according to an embodiment of the present invention, once the fixing sleeve 200 is moved rearward, the friction between the sleeve rib 225 located thereon and the body wall 410 of the syringe body 400 is relatively large. The fixed sleeve 200 cannot be moved forward again (ie, in the direction above the figure). In other words, the sleeve rib 225 is designed to limit the ability of the fixed sleeve 200 to be advanced, but it can continue to be pulled back.

Thereafter, if the user continues to pull back the piston arm 100, the fixed sleeve 200 will continue to be pulled back along with the piston module (including the piston arm 100 and the piston end 300).

When the fixation sleeve 200 is retracted to the bottom opening of the syringe body 400, the stop block 460 on the syringe body 400 will abut the fixation sleeve 200 such that the fixation sleeve 200 cannot continue to move backward. In other words, the stop block 460 is such that the fixed sleeve 200 cannot be withdrawn from the syringe body 400.

In this case, as shown in Fig. 6C, the fixed sleeve 200 is restrained from moving forward or backward again because the fixed sleeve 200 is blocked by the stopper 460 and cannot be continued. Move back. Moreover, the fixing sleeve 200 also makes the fixing sleeve 200 unable to move forward again due to the design of the sleeve rib 225.

Continuation Please refer to Figure 6D. Since the fixed sleeve 200 has been restrained at this time, it cannot be moved forward or backward. Therefore, if the user continues to push the hand portion 110, in this case, only the piston arm 100 can continue to move forward, and further, the protruding tip 330 on the piston end will be pushed out from the fixed sleeve 200. Still further, after the protruding tip 330 leaves the sleeve of the fixed sleeve 200, as shown in FIG. 6D, the protruding tip 330 will no longer engage with the tip flange 122 on the piston arm 100. However, despite this, the piston end 300 can continue to move forward by the pushing of the lever member 140 and the protruding tip 330 in contact therewith.

As shown in Figure 6E, as the piston module advances all the way forward, the final piston end 300 will be forced against the front end of the syringe body 400 near the needle.

At this time, if the user pulls back the piston arm 100 again, since the protruding tip 330 is no longer engaged with the tip flange 122, as shown in FIG. 6F, both the piston end 300 and the piston arm 100 will start. Separation.

Therefore, after the piston end 300 and the piston arm 100 are separated, the piston arm 100 will not be able to be coupled to the piston end 300 again. In other words, as shown in Fig. 6G and Fig. 6H, the disposable syringe 10 proposed by the present invention cannot be reused again.

In detail, when the protruding tip 330 retreats out of the sleeve of the fixed sleeve 200, the piston end 300 begins to separate from the piston arm 100. Moreover, the piston end 300 and the piston arm 100 cannot be combined again. Thereby, the user can no longer actuate the piston end 300 by pulling the piston arm 100.

Also, after the piston end 300 is separated from the piston arm 100, the use indicator 123 on the piston arm 100 is revealed. The user can know whether the syringe has been used by interpreting the use indicator 123.

Secondly, in order to expand the practical application level of the present invention, the product designer can selectively control the amount of the drug to be injected by the syringe by setting a plurality of sleeve ribs 225. For example, if the amount of drug to be introduced by the syringe is 25% of the tube volume of the syringe body, the sleeve rib 225 can optionally be placed at a position corresponding to 25% of the tube volume. Moreover, if the amount of the drug to be introduced by the syringe is 50% of the tube volume of the syringe body, the other sleeve rib 225 should be placed at a position corresponding to 50% of the tube volume to control the row of the fixing sleeve 200. After the sleeve rib 225 is located, it cannot be pushed back again, and the piston end 300 also starts to separate from the piston arm 100 at this time.

According to an embodiment of the present invention, after the disposable syringe 10 of the present invention completes the injection, the piston arm 100 can be removed from the syringe body 400, and the piston arm 100 cannot be engaged with the piston end again, thereby The invention effectively achieves the goal of ensuring that the syringe can only be used in a single use, and effectively avoids the problems that may arise from the sharing of the needle.

In view of the above, in order to enable the reviewing committee to further understand the techniques, means and functions of the present invention for achieving the intended purpose, the above is a detailed description and the accompanying drawings of the present invention. Characteristics, when you can get an in-depth and specific It is to be understood that the scope of the invention is not limited by the description of the invention.

In the disposable syringe disclosed in the present invention, the protruding tip is disposed on the piston end, and the tip flange is disposed on the piston arm. When the fixing sleeve is disposed around the protruding tip, the piston arm and the piston end can be fixed by the protruding tip and the tip flange which are engaged with each other. If the user continues to advance the piston arm such that the protruding tip is pushed out of the fixed sleeve, the piston end and the piston arm will begin to separate. Thereby, the present invention achieves the effect of ensuring that the syringe can only be used in a single use.

The embodiments described above are merely illustrative of the technical spirit and the features of the present invention, and the objects of the present invention can be understood by those skilled in the art, and the scope of the present invention cannot be limited thereto. That is, the equivalent variations or modifications made by the spirit of the present invention should still be included in the scope of the present invention.

10‧‧‧Disposable syringe

100‧‧‧ piston arm

110‧‧‧Handheld Department

111‧‧‧Thread

112‧‧‧ thread

120‧‧‧Connection handle

122‧‧‧Front flange

123‧‧‧Use indicator

140‧‧‧ rods

200‧‧‧Fixed sleeve

220‧‧‧Outer sleeve

225‧‧‧Sleeve ribs

230‧‧‧Inner sleeve

235‧‧"Sleeve piece

300‧‧‧ piston end

310‧‧‧Top

320‧‧‧Base

321‧‧‧ accommodating space

330‧‧‧Outstanding tip

400‧‧‧Syringe body

410‧‧‧ body wall

411‧‧‧scale

415‧‧‧ body tip

450‧‧‧First body flange

451‧‧‧Second body flange

460‧‧‧stop block

461‧‧‧stop wall

Figure 1A is a cross-sectional view of a piston arm of a disposable syringe in accordance with the present invention.

Figure 1B is a side view of a piston arm of a disposable syringe in accordance with the present invention.

Figure 1C is a rear view of the piston arm of the disposable syringe proposed in accordance with the present invention.

1D is a cross-sectional view of a hand held portion of a piston arm of a disposable syringe in accordance with the present invention.

Figure 1E is a side elevational view of the piston arm hand of a disposable syringe in accordance with the present invention.

Figure 1F is a rear elevational view of the hand grip of the piston arm of the disposable syringe proposed in accordance with the present invention.

Figure 2A is a cross-sectional view of the fixation sleeve of the disposable syringe in accordance with the present invention.

Figure 2B is a side elevational view of the fixation sleeve of the disposable syringe in accordance with the present invention.

Figure 2C is a rear view of the fixation sleeve of the disposable syringe proposed in accordance with the present invention.

Figure 3A is a cross-sectional view of the piston end of a disposable syringe in accordance with the present invention.

Figure 3B is a side elevational view of the piston end of a disposable syringe in accordance with the present invention.

Figure 3C is a rear view of the piston end of the disposable syringe in accordance with the present invention.

Figure 4A is a cross-sectional view of the syringe body of the disposable syringe disclosed in accordance with the present invention.

Figure 4B is a side elevational view of the syringe body of the disposable syringe disclosed in accordance with the present invention.

Figure 4C is a rear elevational view of the syringe body of the disposable syringe disclosed in accordance with the present invention.

Figure 4D is a cross-sectional view of the stop block on the syringe body of the disposable syringe in accordance with an embodiment of the present invention.

Figure 4E is a side elevational view of the stop block on the syringe body of the disposable syringe in accordance with an embodiment of the present invention.

Figure 4F is a rear elevational view of the stop block on the syringe body of the disposable syringe in accordance with an embodiment of the present invention.

Figure 5A is a cross-sectional view of a disposable syringe in accordance with an embodiment of the present invention.

Figure 5B is a side view of a disposable syringe in accordance with an embodiment of the present invention.

Figure 6A is a schematic illustration of a stage of a disposable syringe in accordance with an embodiment of the present invention during use.

Figure 6B is a schematic illustration of a stage of a disposable syringe in accordance with an embodiment of the present invention during use.

Figure 6C is a schematic illustration of a stage of a disposable syringe in accordance with an embodiment of the present invention during use.

Figure 6D is a schematic illustration of a stage of a disposable syringe in accordance with an embodiment of the present invention during use.

Figure 6E is a schematic illustration of a stage of a disposable syringe in accordance with an embodiment of the present invention during use.

Figure 6F is a schematic illustration of a stage of a disposable syringe in accordance with an embodiment of the present invention during use.

Figure 6G is a schematic illustration of a stage of a disposable syringe in accordance with an embodiment of the present invention during use.

Figure 6H is a schematic illustration of a stage of a disposable syringe in accordance with an embodiment of the present invention during use.

10‧‧‧Disposable syringe

110‧‧‧Handheld Department

120‧‧‧Connection handle

200‧‧‧Fixed sleeve

300‧‧‧ piston end

330‧‧‧Outstanding tip

Claims (20)

A disposable syringe comprising: a piston arm; a piston end; a fixed sleeve surrounding the piston arm and the piston end; and a syringe body accommodating the piston arm, the piston end and The fixing sleeve, wherein when a user first pulls back the piston arm and then pushes the piston arm, the piston end is separated from the piston arm, and the piston end is separated from the fixing sleeve range. The disposable syringe of claim 1, wherein the piston end has at least one protruding tip that is engageable with a tip flange of the piston arm. The disposable syringe of claim 1, wherein the outer surface of the fixing sleeve has at least one sleeve rib, the sleeve rib restricting the fixing sleeve from being advanced. The disposable syringe according to claim 1, wherein the fixing sleeve comprises: an inner sleeve made of plastic; and an outer sleeve made of synthetic rubber. The disposable syringe of claim 1, wherein the syringe body further comprises a stop block for preventing the fixed sleeve from exiting the syringe body. A disposable syringe according to claim 1 wherein the piston arm has a usage indicator for indicating whether the syringe has been used. The disposable syringe of claim 1, wherein the piston arm further comprises a rod that is engaged with the rod end by the rod inserted in the piston end. The disposable syringe of claim 7, wherein the rod member and the piston end portion are disposed corresponding to each other to prevent the piston end from being rotated away from the piston arm. A disposable syringe comprising: a piston end having at least one protruding tip; a piston arm having at least one tip flange engageable with the protruding tip to engage the piston end And the piston arm; a fixing sleeve disposed circumferentially outside the protruding tip; A syringe body houses the piston arm, the piston end and the fixing sleeve. The disposable syringe of claim 9, wherein the fixing sleeve has at least one sleeve rib, the sleeve rib restricting the fixing sleeve from being advanced. The disposable syringe of claim 9, wherein the disposable end of the disposable syringe is located within the syringe body prior to use and after use. The disposable syringe of claim 9, wherein the fixed tip is separated from the piston arm after the fixed tip leaves the sleeve of the fixed sleeve. The disposable syringe of claim 9, wherein the syringe body further includes a stop block to prevent the fixed sleeve from exiting the syringe body. The disposable syringe of claim 9, wherein when a user first pulls back the piston arm and then pushes the piston arm, the fixed tip on the piston end leaves the sleeve of the fixing sleeve. A disposable syringe according to claim 9 wherein the piston arm has a usage indicator for indicating whether the syringe has been used. A disposable syringe comprising: a piston arm; a piston end having at least one protruding tip for engaging with the piston arm by the protruding tip: a fixing sleeve having at least one sleeve convex a rib, when the protruding tip is engaged with the piston arm, the fixing sleeve is disposed around the protruding tip, and a syringe body receives the piston arm, the piston end and the fixing sleeve, The syringe body has a stop block for preventing the fixed sleeve from exiting the syringe body. The disposable syringe of claim 16, wherein the disposable end of the disposable syringe is located within the syringe body prior to use and after use. The disposable syringe of claim 16, wherein the fixed tip is detached from the piston arm after the fixed tip leaves the sleeve of the fixed sleeve. The disposable syringe of claim 16, wherein the syringe body further comprises a stop block to prevent the fixed sleeve from exiting the syringe body. The disposable syringe of claim 16, wherein when a user pushes the piston arm, the fixed tip on the piston end is out of the sleeve of the fixed sleeve.